This document describes in vitro screening methods for acetylcholine, norepinephrine, and serotonin. It discusses methods to estimate acetylcholine-esterase and butyrylcholine-esterase activity. It also describes releasing radioactive acetylcholine from brain slices and measuring its stimulation and inhibition. A novel method is presented for screening treatments for eye strain using rabbit ciliary muscles in a tissue bath.
This document describes various in vivo and in vitro screening methods used to evaluate potential analgesic compounds. Some key in vivo methods include the tail flick test, hot plate test, and acetic acid-induced writhing test, which assess analgesic effects using thermal, mechanical, and chemical pain stimuli, respectively. Important in vitro assays involve measuring the inhibition of nociceptin, binding to opioid receptors, and inhibition of enkephalinase enzyme. The screening methods aim to distinguish between narcotic and non-narcotic analgesics and help identify new compounds for treating different pain states.
This document summarizes methods for screening sympathomimetic and sympatholytic drugs. Sympathomimetics mimic epinephrine and stimulate the sympathetic nervous system, while sympatholytics block these effects. Screening methods include in vivo tests using cat spleens or measuring nictitating membrane prolapse in cats. In vitro tests involve measuring contractions of rabbit pulmonary arteries, rat vas deferens, or cat spleen strips in response to drugs. These assays allow evaluating sympatholytic potency by assessing the ability of test drugs to reduce contractions caused by agonists like epinephrine and norepinephrine.
This document provides information about Alzheimer's disease including its definition, history, pathophysiology, mechanisms, signs and symptoms, treatments, and screening methods. It discusses how Alzheimer's was first identified by Dr. Alois Alzheimer in 1906 and the characteristic brain abnormalities he observed. The two main hypotheses for the disease mechanism are the amyloid beta hypothesis and tau hypothesis which involve the accumulation of amyloid plaques and neurofibrillary tangles respectively. Several in vitro and in vivo screening methods are described to test potential drugs for treating Alzheimer's including assays measuring acetylcholinesterase inhibition and animal behavior tests.
An assignment in the subject "Pharmacological and Toxicological Screening", 1st year, M.Pharm, Pharmacology, 1st semester. This presentation provides a brief knowledge about Pre-clinical Screening, Hypertension, Its Types, Normal body mechanism in Hypertension, Screening Procedures, Animal models, Animal model criteria, various screening procedures and their evaluation, Recent discovery, Hypertension Facts, Recent Discovery and Treatment for Hypertension.
This document summarizes several preclinical models used to screen anxiolytic agents. It describes anxiety disorders and the goal of developing animal models that resemble human pathology. Several models are explained in detail, including the elevated plus maze test, light-dark exploration test, and social interaction test in rats. These tests measure anxiety-like behaviors in rodents and can determine if candidate drugs decrease inhibited behaviors. The document also reviews in vitro and in vivo methods for evaluating putative anxiolytics before clinical trials.
This document describes various in vivo and in vitro models used for screening potential antiparkinsonian drugs. Some key in vivo models mentioned include: 1) antagonism of tremors induced by tremorine/oxotremorine in mice, 2) use of the MPTP model in monkeys to induce Parkinson's disease-like symptoms, and 3) antagonism of sedation induced by reserpine in mice. Important in vitro/ex vivo models include measuring dopamine-stimulated adenylyl cyclase activity and radioligand binding studies for dopamine receptors. The document provides details on the procedures, evaluations, and modifications of these various screening models.
This document describes various in vivo and in vitro screening methods used to evaluate potential analgesic compounds. Some key in vivo methods include the tail flick test, hot plate test, and acetic acid-induced writhing test, which assess analgesic effects using thermal, mechanical, and chemical pain stimuli, respectively. Important in vitro assays involve measuring the inhibition of nociceptin, binding to opioid receptors, and inhibition of enkephalinase enzyme. The screening methods aim to distinguish between narcotic and non-narcotic analgesics and help identify new compounds for treating different pain states.
This document summarizes methods for screening sympathomimetic and sympatholytic drugs. Sympathomimetics mimic epinephrine and stimulate the sympathetic nervous system, while sympatholytics block these effects. Screening methods include in vivo tests using cat spleens or measuring nictitating membrane prolapse in cats. In vitro tests involve measuring contractions of rabbit pulmonary arteries, rat vas deferens, or cat spleen strips in response to drugs. These assays allow evaluating sympatholytic potency by assessing the ability of test drugs to reduce contractions caused by agonists like epinephrine and norepinephrine.
This document provides information about Alzheimer's disease including its definition, history, pathophysiology, mechanisms, signs and symptoms, treatments, and screening methods. It discusses how Alzheimer's was first identified by Dr. Alois Alzheimer in 1906 and the characteristic brain abnormalities he observed. The two main hypotheses for the disease mechanism are the amyloid beta hypothesis and tau hypothesis which involve the accumulation of amyloid plaques and neurofibrillary tangles respectively. Several in vitro and in vivo screening methods are described to test potential drugs for treating Alzheimer's including assays measuring acetylcholinesterase inhibition and animal behavior tests.
An assignment in the subject "Pharmacological and Toxicological Screening", 1st year, M.Pharm, Pharmacology, 1st semester. This presentation provides a brief knowledge about Pre-clinical Screening, Hypertension, Its Types, Normal body mechanism in Hypertension, Screening Procedures, Animal models, Animal model criteria, various screening procedures and their evaluation, Recent discovery, Hypertension Facts, Recent Discovery and Treatment for Hypertension.
This document summarizes several preclinical models used to screen anxiolytic agents. It describes anxiety disorders and the goal of developing animal models that resemble human pathology. Several models are explained in detail, including the elevated plus maze test, light-dark exploration test, and social interaction test in rats. These tests measure anxiety-like behaviors in rodents and can determine if candidate drugs decrease inhibited behaviors. The document also reviews in vitro and in vivo methods for evaluating putative anxiolytics before clinical trials.
This document describes various in vivo and in vitro models used for screening potential antiparkinsonian drugs. Some key in vivo models mentioned include: 1) antagonism of tremors induced by tremorine/oxotremorine in mice, 2) use of the MPTP model in monkeys to induce Parkinson's disease-like symptoms, and 3) antagonism of sedation induced by reserpine in mice. Important in vitro/ex vivo models include measuring dopamine-stimulated adenylyl cyclase activity and radioligand binding studies for dopamine receptors. The document provides details on the procedures, evaluations, and modifications of these various screening models.
preclinical screening method of antiemetic drugs.pptxSIRAJUDDIN MOLLA
The document summarizes various preclinical models used to screen emetic and anti-emetic drugs. It describes in vivo models using animals like dogs, ferrets and house musk shrews to induce vomiting through chemicals like cisplatin, copper sulfate, apomorphine and radiation. It also discusses in vitro models to test 5-HT3 receptor antagonism and parameters observed like latency and number of vomiting episodes.
Screening models for central and peripheral analgesicskrishnabajgire
This document describes screening models used to test central and peripheral analgesic activity. For central analgesic activity, it discusses the hot plate test, grid-shock test, and tail immersion test which measure response latency to a painful stimulus. For peripheral analgesic activity, it discusses the writhing test which counts stretching behaviors in mice after an irritant injection, and the Randall-Selitto test which applies pressure to inflamed tissue in rats to measure pain threshold changes.
Cns stimulants and depressants screening modelsDRASHTI PATEL
This document discusses methods for screening central nervous system (CNS) stimulants and depressants. It begins by defining the CNS and its major components. It then describes various CNS neurotransmitters and what qualifies as a CNS stimulant or depressant. The document outlines several behavioral tests used to evaluate CNS stimulation and depression in animals, including photoactometer testing, forced swim testing, and benzodiazepine-induced sleeping time. It also classifies common CNS stimulants and depressants and reviews in vivo and in vitro evaluation methods.
Blood collection, Anesthesia and Euthanasia techniques in laboratory animalsHtet Wai Moe
This document discusses blood collection, anesthesia, and euthanasia techniques in laboratory animals. It provides details on various blood collection methods for different species, including factors to consider, sites for collection, procedures, volume limits, and potential adverse effects. Guidelines for fluid replacement and recovery periods are included. Anesthesia techniques involving inhalants, injectables, immersion, and local anesthetics are outlined. Post-operative care and agents for premedication and monitoring anesthesia are also summarized.
Anesthesia and euthanasia of experimental animal by vivek and naveenAnimatedWorld
Anesthesia and euthanasia of experimental animal by vivek and naveen
Anesthesia
It is a state of controlled temporary loss of sensation or awareness that or awareness that is induced for medical purpose.
Anesthetic agents
The anesthetic agents are great and choosing the correct one for particular suggestion.
In laboratory animal field , the anesthetic surgeon and post operative are often one and the same person.
This will help to chose correct drug for anaesthesia.
Sometime the wise anesthetic agents also cause undesirable responses. so, its responsibility of experimenters to document this advance in exprimental protocol
Euthanasia
The term euthanasia is derived from the Greek terms eu mean good and thanatos mean death.
Euthanasia is the act of including humane death in an animal. sacrificing the experimental animal after use by gentle procedure causing minimum of physical and mental suffering is called euthanasia.
Screening of antidepressants involves both in vitro and in vivo methods. In vitro assays examine inhibition of neurotransmitter uptake or binding to receptors to assess monoamine effects. Common in vivo models include forced swim test and tail suspension test in rodents, which measure immobility time as an indicator of antidepressant activity. Other models explore mechanisms like learned helplessness, muricide behavior, and biogenic amine depletion. A variety of assays allow evaluation of potential antidepressants through monoamine, neuroendocrine and behavioral effects to aid development of safer, more effective drugs.
This document describes several animal models used to screen for potential antidepressant drugs, including the water wheel model, learned helplessness test, tail suspension test, amphetamine potentiation test, and muricidal behavior model. It explains the procedures and principles of each test, noting that some classical antidepressants reduce immobility time in tests like the water wheel and forced swim tests. However, these models have limitations and may not accurately model human depression or detect all effective antidepressants.
This document discusses the central nervous system (CNS) and methods for evaluating CNS stimulants. It defines the CNS as the brain and spinal cord, describes CNS parts and functions. It then lists several classes and examples of CNS stimulants, and provides details on 10 methods for evaluating CNS stimulants in animals, including tests measuring locomotor activity, motor coordination, and duration of anesthesia.
Neurotransmitters/General aspect and steps involved in neurotransmission.pptxSIRAJUDDIN MOLLA
Neurotransmission (Latin: transmission "passage, crossing" from transmitter "send, let through"), is the process by which signalling molecules called neurotransmitters are released by the axon terminal of a neuron and bind to and react with the receptors on the dendrites of another neuron
Expt. 9 Effect of atropine on DRC of acetylcholine using rat ileumVISHALJADHAV100
Objective
Principle
Requirements
Experimental specifications (conditions)
Preparation of ACh and Atropine stock and std. solutions
Preparation of Tyrode solution (PSS)
Procedure
Kymograph recording of contractions
Observation table
Calculation
Graphical presentation of CRC/ DRC
Result and interpretation
Preclinical Screening for Neurodegenerative Disease (Parkinsonism)Drx Burade
This file includes the general introduction of Parkinson's, sign and symptoms of Parkinson's, treatment of Parkinson's and the main content that is the Preclinical Screening models for Neurodegenerative disease like Parkinson's
This document summarizes various preclinical screening methods used to evaluate potential anti-epileptic drugs. It describes several animal models of induced seizures including electroshock seizures, chemical-induced seizures using pentylenetetrazol or picrotoxin. It also discusses genetic models like the totterer mouse that is prone to spontaneous seizures. The key methods are maximal electroshock in mice/rats to test generalized tonic-clonic seizure protection and the pentylenetetrazol test in mice to assess anticonvulsant effects against petit mal-like seizures. These preclinical tests aim to predict potential efficacy of new compounds before clinical trials in humans.
This document describes screening methods for drugs that act on the autonomic nervous system (ANS). It discusses drugs that act on the sympathetic and parasympathetic nervous systems. For screening sympathetic drugs, both in vivo and in vitro methods are described including the cat spleen method, rat blood pressure models, and isolated tissue preparations. For parasympathetic drugs and sympathetic blockers, methods like the nictitating membrane prolapse in cats and mouse eye assays are outlined. The document provides detailed procedures for many of these screening models.
This document discusses screening methods for anticancer agents. It describes both in vitro and in vivo methods. For in vitro screening, assays are discussed that measure cell viability, proliferation, and cytotoxicity, such as the MTT assay, Sulforhodamine B assay, 3H-thymidine uptake assay, and dye exclusion tests. For in vivo screening, models are described that use chemically-induced tumors in animals as well as cell line and xenograft transplant models to test potential anticancer agents and measure effects on tumor growth.
Ruchi Yadav from the Department of Pharmacology presented on screening for anti-Alzheimer activity. There are two types of models: 1) models testing learning and memory using avoidance tests, discrimination learning, and conditioned responses; and 2) transgenic mouse models exhibiting tau pathology or amyloid-beta toxicity. Common learning and memory tests include step-down avoidance, step-through avoidance, and water maze tasks. Transgenic mouse models express mutant human tau or amyloid precursor protein genes linked to Alzheimer's disease.
In this slide contains diabetics, classification, symptoms, complication, invivo and invitro screening models of anti diabetics.
Presented by: GEETHANJALI ADAPALA (Department of pharmacology).
RIPER, anantapur
This document describes methods for testing and characterizing drugs that act on the sympathetic or parasympathetic nervous systems. It provides details on techniques using isolated tissues and whole animals to study effects of potential sympathomimetic, sympatholytic, parasympathomimetic, and parasympatholytic drugs. These include measuring changes in pupil diameter, tracheal smooth muscle contraction, rat uterus response, and blood pressure as indicators of sympathetic or parasympathetic activity.
Pharmacological screening of analgesic activityBiswash Sapkota
1. The document describes several screening methods used to evaluate potential analgesic agents, including in vivo models using thermal, electrical, or chemical stimuli to induce pain states in animals, as well as in vitro receptor binding assays.
2. Common in vivo models discussed are the hot plate test, tail flick test, writhing test induced by acetic acid injection, and formalin test, which create persistent pain.
3. Details are provided on procedures for these tests, which involve administering a potential analgesic and measuring its ability to delay pain-induced responses like paw licking or jumping.
ACTH, also known as corticotropin, is a polypeptide hormone secreted by the pituitary gland that stimulates the production of cortisol by the adrenal glands. Two common bioassays are described for measuring ACTH activity. The first involves measuring ascorbic acid depletion in the adrenal glands of hypophysectomized rats after ACTH administration. The second measures corticosterone levels in the blood of dexamethasone-blocked rats at increasing time points after ACTH injection. Both assays involve administration of multiple doses of a standard ACTH preparation and test preparation to rats, followed by quantitative chemical analysis to determine potency ratios and confidence limits for the test preparation relative to the standard
This document summarizes the bioassay of adrenocorticotropic hormone (ACTH). ACTH is a polypeptide hormone secreted by the pituitary gland that stimulates the adrenal glands to produce cortisol. The bioassay involves administering varying doses of a standard or test ACTH preparation to hypophysectomized rats and measuring the resulting depletion of ascorbic acid in the adrenal glands after 3 hours, using the depletion levels to determine the potency of the test preparation relative to the standard. The procedure involves preparing serial dilutions of the standard and test ACTH, administering doses to groups of hypophysectomized rats, removing and analyzing their adrenal glands for ascor
preclinical screening method of antiemetic drugs.pptxSIRAJUDDIN MOLLA
The document summarizes various preclinical models used to screen emetic and anti-emetic drugs. It describes in vivo models using animals like dogs, ferrets and house musk shrews to induce vomiting through chemicals like cisplatin, copper sulfate, apomorphine and radiation. It also discusses in vitro models to test 5-HT3 receptor antagonism and parameters observed like latency and number of vomiting episodes.
Screening models for central and peripheral analgesicskrishnabajgire
This document describes screening models used to test central and peripheral analgesic activity. For central analgesic activity, it discusses the hot plate test, grid-shock test, and tail immersion test which measure response latency to a painful stimulus. For peripheral analgesic activity, it discusses the writhing test which counts stretching behaviors in mice after an irritant injection, and the Randall-Selitto test which applies pressure to inflamed tissue in rats to measure pain threshold changes.
Cns stimulants and depressants screening modelsDRASHTI PATEL
This document discusses methods for screening central nervous system (CNS) stimulants and depressants. It begins by defining the CNS and its major components. It then describes various CNS neurotransmitters and what qualifies as a CNS stimulant or depressant. The document outlines several behavioral tests used to evaluate CNS stimulation and depression in animals, including photoactometer testing, forced swim testing, and benzodiazepine-induced sleeping time. It also classifies common CNS stimulants and depressants and reviews in vivo and in vitro evaluation methods.
Blood collection, Anesthesia and Euthanasia techniques in laboratory animalsHtet Wai Moe
This document discusses blood collection, anesthesia, and euthanasia techniques in laboratory animals. It provides details on various blood collection methods for different species, including factors to consider, sites for collection, procedures, volume limits, and potential adverse effects. Guidelines for fluid replacement and recovery periods are included. Anesthesia techniques involving inhalants, injectables, immersion, and local anesthetics are outlined. Post-operative care and agents for premedication and monitoring anesthesia are also summarized.
Anesthesia and euthanasia of experimental animal by vivek and naveenAnimatedWorld
Anesthesia and euthanasia of experimental animal by vivek and naveen
Anesthesia
It is a state of controlled temporary loss of sensation or awareness that or awareness that is induced for medical purpose.
Anesthetic agents
The anesthetic agents are great and choosing the correct one for particular suggestion.
In laboratory animal field , the anesthetic surgeon and post operative are often one and the same person.
This will help to chose correct drug for anaesthesia.
Sometime the wise anesthetic agents also cause undesirable responses. so, its responsibility of experimenters to document this advance in exprimental protocol
Euthanasia
The term euthanasia is derived from the Greek terms eu mean good and thanatos mean death.
Euthanasia is the act of including humane death in an animal. sacrificing the experimental animal after use by gentle procedure causing minimum of physical and mental suffering is called euthanasia.
Screening of antidepressants involves both in vitro and in vivo methods. In vitro assays examine inhibition of neurotransmitter uptake or binding to receptors to assess monoamine effects. Common in vivo models include forced swim test and tail suspension test in rodents, which measure immobility time as an indicator of antidepressant activity. Other models explore mechanisms like learned helplessness, muricide behavior, and biogenic amine depletion. A variety of assays allow evaluation of potential antidepressants through monoamine, neuroendocrine and behavioral effects to aid development of safer, more effective drugs.
This document describes several animal models used to screen for potential antidepressant drugs, including the water wheel model, learned helplessness test, tail suspension test, amphetamine potentiation test, and muricidal behavior model. It explains the procedures and principles of each test, noting that some classical antidepressants reduce immobility time in tests like the water wheel and forced swim tests. However, these models have limitations and may not accurately model human depression or detect all effective antidepressants.
This document discusses the central nervous system (CNS) and methods for evaluating CNS stimulants. It defines the CNS as the brain and spinal cord, describes CNS parts and functions. It then lists several classes and examples of CNS stimulants, and provides details on 10 methods for evaluating CNS stimulants in animals, including tests measuring locomotor activity, motor coordination, and duration of anesthesia.
Neurotransmitters/General aspect and steps involved in neurotransmission.pptxSIRAJUDDIN MOLLA
Neurotransmission (Latin: transmission "passage, crossing" from transmitter "send, let through"), is the process by which signalling molecules called neurotransmitters are released by the axon terminal of a neuron and bind to and react with the receptors on the dendrites of another neuron
Expt. 9 Effect of atropine on DRC of acetylcholine using rat ileumVISHALJADHAV100
Objective
Principle
Requirements
Experimental specifications (conditions)
Preparation of ACh and Atropine stock and std. solutions
Preparation of Tyrode solution (PSS)
Procedure
Kymograph recording of contractions
Observation table
Calculation
Graphical presentation of CRC/ DRC
Result and interpretation
Preclinical Screening for Neurodegenerative Disease (Parkinsonism)Drx Burade
This file includes the general introduction of Parkinson's, sign and symptoms of Parkinson's, treatment of Parkinson's and the main content that is the Preclinical Screening models for Neurodegenerative disease like Parkinson's
This document summarizes various preclinical screening methods used to evaluate potential anti-epileptic drugs. It describes several animal models of induced seizures including electroshock seizures, chemical-induced seizures using pentylenetetrazol or picrotoxin. It also discusses genetic models like the totterer mouse that is prone to spontaneous seizures. The key methods are maximal electroshock in mice/rats to test generalized tonic-clonic seizure protection and the pentylenetetrazol test in mice to assess anticonvulsant effects against petit mal-like seizures. These preclinical tests aim to predict potential efficacy of new compounds before clinical trials in humans.
This document describes screening methods for drugs that act on the autonomic nervous system (ANS). It discusses drugs that act on the sympathetic and parasympathetic nervous systems. For screening sympathetic drugs, both in vivo and in vitro methods are described including the cat spleen method, rat blood pressure models, and isolated tissue preparations. For parasympathetic drugs and sympathetic blockers, methods like the nictitating membrane prolapse in cats and mouse eye assays are outlined. The document provides detailed procedures for many of these screening models.
This document discusses screening methods for anticancer agents. It describes both in vitro and in vivo methods. For in vitro screening, assays are discussed that measure cell viability, proliferation, and cytotoxicity, such as the MTT assay, Sulforhodamine B assay, 3H-thymidine uptake assay, and dye exclusion tests. For in vivo screening, models are described that use chemically-induced tumors in animals as well as cell line and xenograft transplant models to test potential anticancer agents and measure effects on tumor growth.
Ruchi Yadav from the Department of Pharmacology presented on screening for anti-Alzheimer activity. There are two types of models: 1) models testing learning and memory using avoidance tests, discrimination learning, and conditioned responses; and 2) transgenic mouse models exhibiting tau pathology or amyloid-beta toxicity. Common learning and memory tests include step-down avoidance, step-through avoidance, and water maze tasks. Transgenic mouse models express mutant human tau or amyloid precursor protein genes linked to Alzheimer's disease.
In this slide contains diabetics, classification, symptoms, complication, invivo and invitro screening models of anti diabetics.
Presented by: GEETHANJALI ADAPALA (Department of pharmacology).
RIPER, anantapur
This document describes methods for testing and characterizing drugs that act on the sympathetic or parasympathetic nervous systems. It provides details on techniques using isolated tissues and whole animals to study effects of potential sympathomimetic, sympatholytic, parasympathomimetic, and parasympatholytic drugs. These include measuring changes in pupil diameter, tracheal smooth muscle contraction, rat uterus response, and blood pressure as indicators of sympathetic or parasympathetic activity.
Pharmacological screening of analgesic activityBiswash Sapkota
1. The document describes several screening methods used to evaluate potential analgesic agents, including in vivo models using thermal, electrical, or chemical stimuli to induce pain states in animals, as well as in vitro receptor binding assays.
2. Common in vivo models discussed are the hot plate test, tail flick test, writhing test induced by acetic acid injection, and formalin test, which create persistent pain.
3. Details are provided on procedures for these tests, which involve administering a potential analgesic and measuring its ability to delay pain-induced responses like paw licking or jumping.
ACTH, also known as corticotropin, is a polypeptide hormone secreted by the pituitary gland that stimulates the production of cortisol by the adrenal glands. Two common bioassays are described for measuring ACTH activity. The first involves measuring ascorbic acid depletion in the adrenal glands of hypophysectomized rats after ACTH administration. The second measures corticosterone levels in the blood of dexamethasone-blocked rats at increasing time points after ACTH injection. Both assays involve administration of multiple doses of a standard ACTH preparation and test preparation to rats, followed by quantitative chemical analysis to determine potency ratios and confidence limits for the test preparation relative to the standard
This document summarizes the bioassay of adrenocorticotropic hormone (ACTH). ACTH is a polypeptide hormone secreted by the pituitary gland that stimulates the adrenal glands to produce cortisol. The bioassay involves administering varying doses of a standard or test ACTH preparation to hypophysectomized rats and measuring the resulting depletion of ascorbic acid in the adrenal glands after 3 hours, using the depletion levels to determine the potency of the test preparation relative to the standard. The procedure involves preparing serial dilutions of the standard and test ACTH, administering doses to groups of hypophysectomized rats, removing and analyzing their adrenal glands for ascor
This document summarizes a seminar on bioassay of official drugs. It defines bioassay, describes the principles and importance of bioassay, and outlines common types including heparin sodium, oxytocin, streptokinase, and vitamin D. Limitations of bioassay are also noted. Methods for each drug are provided, including preparation of standards and testing solutions, procedures, and statistical analysis of results.
This document describes various in vitro and in vivo screening methods for evaluating anticholinesterase agents. It outlines assays measuring acetylcholinesterase and butyrylcholinesterase inhibition in rat and human tissues. In vivo methods include inhibitory avoidance tests in rodents using step-down, step-through, and uphill avoidance tasks. Other tests involve active avoidance, discrimination learning, and conditioned response tasks to assess effects on memory and learning. The document provides detailed procedures, reagents, and evaluations for each screening method.
Bioassay of Digitalis, d-tubocurarine , OxytocinHeena Parveen
This document summarizes several bioassay methods for determining the potency of digitalis, oxytocin, and d-tubocurarine (d-tb) extracts, including guinea pig, cat, and pigeon methods for digitalis; depression of blood pressure in chickens, contraction of rat uterus, and measurement of milk ejection pressure in lactating rats for oxytocin; and rabbit head drop and frog rectus abdominis muscle preparation methods for d-tb. Standard preparations and procedures for administering test and standard extracts and measuring responses are described for each method.
This document describes screening models used to evaluate antihypertensive agents, including both in vitro and in vivo models. It discusses several specific in vitro models like α2-adrenoreceptor binding assays and assays measuring inhibition of angiotensin converting enzyme. It also lists various in vivo models used in rats and dogs to study acute and chronic forms of hypertension. The goal is to screen potential antihypertensive drugs and understand their mechanisms of action through these screening models before testing in clinical trials.
The document discusses the autonomic nervous system and cholinergic drugs. It covers topics such as the sympathetic and parasympathetic nervous systems, neurotransmitters and receptors, cholinergic neurotransmission, and the mechanism of action and effects of cholinergic drugs. Specific cholinergic drugs discussed include acetylcholine, bethanechol, carbachol, and pilocarpine. Pilocarpine is used to treat glaucoma by constricting the pupil and lowering intraocular pressure through its muscarinic receptor agonist effects.
The document discusses the autonomic nervous system and cholinergic drugs. It covers the following key points in 3 sentences:
The autonomic nervous system controls involuntary functions through the sympathetic and parasympathetic nervous systems. Cholinergic drugs such as pilocarpine, physostigmine, and bethanechol act as parasympathomimetic agents by mimicking or enhancing the effects of acetylcholine. These drugs have therapeutic uses for conditions like glaucoma, urinary retention, and Alzheimer's disease by increasing cholinergic neurotransmission.
This document discusses cholinergic agents, which are drugs that produce effects similar to acetylcholine by directly interacting with cholinergic receptors or increasing acetylcholine availability. It classifies cholinergic agonists and anticholinesterases. Cholinergic agonists include acetylcholine and analogs like methacholine and carbachol. Anticholinesterases reversibly or irreversibly inhibit the enzyme acetylcholinesterase, leading to acetylcholine accumulation. Common anticholinesterases discussed are physostigmine, neostigmine, pyridostigmine, and organophosphates. The document provides examples of clinical uses and synthesis for several cholinergic agents.
The document provides information on respiratory and reproductive pharmacology. For respiratory pharmacology, it discusses animal models used in in-vitro and in-vivo tests, including histamine receptor binding and the effects of arachidonic acid. For reproductive pharmacology, it discusses animal models used to study mineralocorticoid activity through electrolyte excretion tests and progestational activity through progesterone receptor binding assays. The document provides details on the procedures, evaluations, and modifications of these pharmacology tests in respiratory and reproductive systems.
This document summarizes the formulation, characterization, and optimization of capecitabine-loaded liposomal gel for sustained drug release and decreased dosing frequency in colorectal cancer treatment. Capecitabine-loaded liposomes were prepared using the lyophilization monophase solution method with soya lecithin, cholesterol, and TBA as variables. Formulation E11 was selected as the optimized liposome based on its entrapment efficiency and drug release profile. This liposome was then incorporated into carbopol gel and characterized for appearance, viscosity, pH and in vitro drug diffusion. The results indicated this liposomal gel system could provide sustained drug release for improved colorectal cancer chemotherapy.
Oxytocin is a hormone produced in the hypothalamus that stimulates contractions of the uterus during childbirth and the mammary glands to produce milk during breastfeeding. It plays an important role in bonding between mothers and their children. There are four main methods used to test the potency of oxytocin in biological assays: by measuring its ability to decrease blood pressure in chickens, induce contractions in isolated rat uteri, increase milk ejection pressure in lactating rats, and elevate blood pressure through vasopressor activity in rats. Each method involves carefully preparing test animals, administering doses of both a standard and test oxytocin preparation, and recording and statistically analyzing the biological responses.
Pre clinical screening models for drugs acting on Autonomic nervous systemRana Rana
This document describes various preclinical models used to screen drugs acting on the autonomic nervous system. It discusses models for screening sympathomimetics, sympatholytics, parasympathomimetics, and parasympatholytics. For sympathomimetics and sympatholytics, in vivo models include measuring blood pressure in dogs, the rabbit eye model, and the cat spleen model. In vitro models include the isolated frog heart and rabbit intestine preparations. For parasympathomimetics and parasympatholytics, in vivo models measure blood pressure responses and miosis in rabbit eyes, while in vitro models use the isolated heart, ileum, frog muscle, and trachea.
Validation of factor xa assay for enoxaparin sodium enoxaparin injectionkrishgen
chromogenic assay intended for the quantitative determination in purified solutions by measurement of factor IIa or Xa inhibition activity. The kit can be used for 100 test reactions as per microtiter plate protocol.
Validation of Factor IIa for heparin sodium or heparin injectionkrishgen
A chromogenic assay intended for the quantitative determination in purified solutions by measurement of factor IIa or Xa inhibition activity. The kit can be used for 100 test reactions as per microtiter plate protocol.
This document provides details on bioassay methods for several compounds including vasopressin, digitalis, d-tubocurarine, histamine, and 5-hydroxytryptamine (5-HT).
It describes two common bioassay methods for vasopressin - the first uses rats to measure changes in blood pressure, the second uses rats and measures anti-diuretic activity. For digitalis, it outlines guinea pig and pigeon bioassays measuring the lethal dose. The d-tubocurarine bioassay uses rabbits to measure head drop or isolated frog muscle to measure contraction reduction. Histamine is assayed using guinea pig ileum or other tissues and measuring contraction. Finally, 5
Preparation of Nanobubbles for Novel Drug DeliveryMadan Baral
This document describes the preparation of nanobubbles for use as ultrasound contrast agents and intracellular drug delivery vectors. Nanobubbles ranging from 25-1000nm were generated using lipids, surfactants, and gases. In vitro and in vivo tests showed the nanobubbles enhanced ultrasound imaging and allowed efficient drug uptake in cancer cells. The effects of formulation variables like lipid concentration, surfactant type and amount on acoustic properties were analyzed. Overall, the study demonstrated nanobubbles' potential as both an ultrasound contrast agent and drug delivery system through noninvasive imaging and targeted therapy.
Validation of Factor IIa assay for enoxaparin sodium or enoxaparin injectionkrishgen
A chromogenic assay intended for the quantitative determination in purified solutions by measurement of factor IIa or Xa inhibition activity. The kit can be used for 100 test reactions as per microtiter plate protocol.
This document provides information on a bilirubin reagent for the quantitative determination of bilirubin in serum. It describes the background and production of bilirubin in the body, the colorimetric diazotized method for measuring total and direct bilirubin, the reagents and procedure used, and performance characteristics including precision, sensitivity, linearity and potential interferents. Normal total and direct bilirubin levels in adults and newborns are also provided.
Similar to In vitro screening methods ach, ne and 5-HT (20)
Healthy Eating Habits:
Understanding Nutrition Labels: Teaches how to read and interpret food labels, focusing on serving sizes, calorie intake, and nutrients to limit or include.
Tips for Healthy Eating: Offers practical advice such as incorporating a variety of foods, practicing moderation, staying hydrated, and eating mindfully.
Benefits of Regular Exercise:
Physical Benefits: Discusses how exercise aids in weight management, muscle and bone health, cardiovascular health, and flexibility.
Mental Benefits: Explains the psychological advantages, including stress reduction, improved mood, and better sleep.
Tips for Staying Active:
Encourages consistency, variety in exercises, setting realistic goals, and finding enjoyable activities to maintain motivation.
Maintaining a Balanced Lifestyle:
Integrating Nutrition and Exercise: Suggests meal planning and incorporating physical activity into daily routines.
Monitoring Progress: Recommends tracking food intake and exercise, regular health check-ups, and provides tips for achieving balance, such as getting sufficient sleep, managing stress, and staying socially active.
This particular slides consist of- what is hypotension,what are it's causes and it's effect on body, risk factors, symptoms,complications, diagnosis and role of physiotherapy in it.
This slide is very helpful for physiotherapy students and also for other medical and healthcare students.
Here is the summary of hypotension:
Hypotension, or low blood pressure, is when the pressure of blood circulating in the body is lower than normal or expected. It's only a problem if it negatively impacts the body and causes symptoms. Normal blood pressure is usually between 90/60 mmHg and 120/80 mmHg, but pressures below 90/60 are generally considered hypotensive.
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PrudentRx's Function in the Management of Chronic Illnesses
In vitro screening methods ach, ne and 5-HT
1. In vitro screening methods Ach, NE andIn vitro screening methods Ach, NE and
5-HT5-HT
Presented by :-Presented by :-
Prof. Anup A. Patil.Prof. Anup A. Patil.
. (Dept. of Pharmacology). (Dept. of Pharmacology)
GIPER,Limb,Satara.GIPER,Limb,Satara.
2. ContentsContents
IntroductionIntroduction
AcetylcholineAcetylcholine
In vitro screening methods for AcetylcholineIn vitro screening methods for Acetylcholine
NorepinephrineNorepinephrine
In vitro screening methods for NorepinephrineIn vitro screening methods for Norepinephrine
5-HT5-HT
In vitro screening methods for 5-HTIn vitro screening methods for 5-HT
ReferencesReferences
3. AcetylcholineAcetylcholine
Acetylcholine is a major neurohumoral transmitter atAcetylcholine is a major neurohumoral transmitter at
autonomic as well as somatic sitesautonomic as well as somatic sites
Acetylcholine has functions both in the peripheralAcetylcholine has functions both in the peripheral
nervous system (PNS) and in the central nervous systemnervous system (PNS) and in the central nervous system
(CNS) as a neuromodulator.(CNS) as a neuromodulator.
In the PNS, acetylcholine activates muscles, and is aIn the PNS, acetylcholine activates muscles, and is a
major neurotransmitter in the autonomic nervousmajor neurotransmitter in the autonomic nervous
systemsystem..
Since a shortage of acetylcholine in the brain has beenSince a shortage of acetylcholine in the brain has been
associated with Alzheimer's disease some drugs thatassociated with Alzheimer's disease some drugs that
inhibit acetylcholinesterase are used in the treatment ofinhibit acetylcholinesterase are used in the treatment of
that diseasethat disease
4. In vitro screening methods for AcetylcholineIn vitro screening methods for Acetylcholine
In vitro estimation of acetylcholine-esterase.
In vitro estimation of butyrylcholine-esterase.
Release of [3
H]ACh and other transmitters from rat brain
slices.
A novel in vitro model for screening and evaluation of
anti-asthenopia
Guinea pig ileum
Isolated eye of rodents
5. In vitro estimation of acetylcholine-esterase.
Purpose and rationale:-Purpose and rationale:-
To screen drugs for inhibition of acetylcholine-esteraseTo screen drugs for inhibition of acetylcholine-esterase
activity.activity.
Inhibitors of this enzyme may be useful in treatment ofInhibitors of this enzyme may be useful in treatment of
Alzheimer's disease.Alzheimer's disease.
It is also called as true or specific cholinesterase.It is also called as true or specific cholinesterase.
Found in nerve cells, skeletal muscle, smooth muscle,Found in nerve cells, skeletal muscle, smooth muscle,
various glands and red blood cells.various glands and red blood cells.
Physiological role of AChE is rapid hydrolysis andPhysiological role of AChE is rapid hydrolysis and
inactivation of acetylcholine.inactivation of acetylcholine.
inhibitors of AChE shows marked cholinomimetic effect.inhibitors of AChE shows marked cholinomimetic effect.
6. Procedure :-Procedure :-
Preparation of reagent (EIIman’s reagent)Preparation of reagent (EIIman’s reagent)
Substrate – 1) Acetylthiocholine 21.6 mg/ml is made usingSubstrate – 1) Acetylthiocholine 21.6 mg/ml is made using
distilled water.distilled water.
2) 5,5’ Dithiobis-2-nitrobenzoic acid2) 5,5’ Dithiobis-2-nitrobenzoic acid
(0.01M)DTNB. 39.6 mg DTNB dissolved in 10 ml of pH 7(0.01M)DTNB. 39.6 mg DTNB dissolved in 10 ml of pH 7
phosphate buffer (0.01M) and 15 mg of bicarbonatephosphate buffer (0.01M) and 15 mg of bicarbonate
added into it.added into it.
3) This reagents are prepared by using3) This reagents are prepared by using
phosphate buffer (pH 7),because this pH reagents arephosphate buffer (pH 7),because this pH reagents are
more stablemore stable
7. Preparation of enzyme homogenatePreparation of enzyme homogenate
Male wistar rats are decapitated, and whole brain isMale wistar rats are decapitated, and whole brain is
taken out quickly.taken out quickly.
The cerebral cortex, cerebellum, medulla oblongata andThe cerebral cortex, cerebellum, medulla oblongata and
midbrain are removed and suspended in phosphatemidbrain are removed and suspended in phosphate
buffer.buffer.
Different regions brains removed homogenate isDifferent regions brains removed homogenate is
prepared in tissue homogenizer (Approximately 20 mg ofprepared in tissue homogenizer (Approximately 20 mg of
the per ml of phosphate buffe )the per ml of phosphate buffe )
2.6 ml of phosphate buffer added to cuvette followed by2.6 ml of phosphate buffer added to cuvette followed by
0.4 ml of aliquot of homogenate.0.4 ml of aliquot of homogenate.
Substrate (acetylthiocholine)20 microlitres added to itSubstrate (acetylthiocholine)20 microlitres added to it
100 micro liter this mixture used for photocell for100 micro liter this mixture used for photocell for
measuring the absorbancemeasuring the absorbance
8. Change in absorbance per minute is calculated.Change in absorbance per minute is calculated.
The rate is calculated by following equation:-The rate is calculated by following equation:-
R =R =
∆ A
1.36 (104
)
1
(400 3120) Co
∆A = Change in absorbance per minute (mean change
in absorbance from the 1st
to 7th
min.is taken )
Co = Original concentration of the tissue (20 mg/ml)
R = Rate in moles substrate hydrolyzed per minute perR = Rate in moles substrate hydrolyzed per minute per
gram of tissuegram of tissue
9. Statistical analysisStatistical analysis
Rat brain acetyl cholinesterase activity of differentRat brain acetyl cholinesterase activity of different
groups are analyzed using one way variance (ANOVA)groups are analyzed using one way variance (ANOVA)
followed by Dunnet's ‘t’ test.followed by Dunnet's ‘t’ test.
10. Release of [3
H]ACh and other transmitters from rat brain
slices.
Purpose and RationalePurpose and Rationale::
Electrically stimulated release of [Electrically stimulated release of [33
H] Ach, used as aH] Ach, used as a
biochemical screen for agents having possible action ofbiochemical screen for agents having possible action of
enhancing or inhibiting release of [enhancing or inhibiting release of [33
H]Ach through a directH]Ach through a direct
muscarinic interaction or other indirect interactionsmuscarinic interaction or other indirect interactions
..
The compound’s effect on [The compound’s effect on [33
H]Ach release may provideH]Ach release may provide
evidence for a wide variety of release activitiesevidence for a wide variety of release activities
The electrically stimulated release technique helps inThe electrically stimulated release technique helps in
measuring the presynaptic activity of test compounds.measuring the presynaptic activity of test compounds.
11. ProcedureProcedure::
a.a. Reagents:Reagents:
1) Krebs-Henseleit bicarbonate buffer, pH 7.4 (KHBB).1) Krebs-Henseleit bicarbonate buffer, pH 7.4 (KHBB).
[Methyl-[Methyl-33
H]-choline chloride (80-90Ci/mmol).H]-choline chloride (80-90Ci/mmol).
0.25nmol of [0.25nmol of [33
H]choline added to 2.5ml of KHBB toH]choline added to 2.5ml of KHBB to
obtain final concentration of 100nM.obtain final concentration of 100nM.
2) 10mM stock solution of the test drug prepared in2) 10mM stock solution of the test drug prepared in
suitable solvent and diluted to get a concentration ofsuitable solvent and diluted to get a concentration of
1010µM with KHBB.µM with KHBB.
3) Hemicholinium-3 or HC-3: 10mM stock solution in3) Hemicholinium-3 or HC-3: 10mM stock solution in
water. 2ml of this solution diluted to 1ltr with KHBB towater. 2ml of this solution diluted to 1ltr with KHBB to
obtain final concentration of 20obtain final concentration of 20µM.µM.
12. Tissue PreparationTissue Preparation::
Male Wistar rats are decapitated and cortical, striatal orMale Wistar rats are decapitated and cortical, striatal or
hippocampal tissue is removed on ice.hippocampal tissue is removed on ice.
0.4m slices are prepared using tissue slicer.0.4m slices are prepared using tissue slicer.
Placed in cold, oxygenated buffer (10-20ml), incubatedPlaced in cold, oxygenated buffer (10-20ml), incubated
for 30min. at 35for 30min. at 35°C.°C.
The buffer is decanted, leaving the slices behind afterThe buffer is decanted, leaving the slices behind after
incubation.incubation.
Then 2.5ml of buffer is added with enough [Then 2.5ml of buffer is added with enough [33
H]choline toH]choline to
get the final concentration of 100nM, incubated andget the final concentration of 100nM, incubated and
shaken for 60min. at 35shaken for 60min. at 35°C under oxygen.°C under oxygen.
Then buffer is decanted and the slices are placed onThen buffer is decanted and the slices are placed on
nylon mesh in the stimulation chamber.nylon mesh in the stimulation chamber.
13. Assay:Assay:
Buffer is pumped through the chamber for 42min. at aBuffer is pumped through the chamber for 42min. at a
constant flow rate of 0.7ml/min to establish a stableconstant flow rate of 0.7ml/min to establish a stable
baseline.baseline.
The released [3H]Ach under these conditions is due toThe released [3H]Ach under these conditions is due to
the hydrolysis by acetylcholinesterase.the hydrolysis by acetylcholinesterase.
The perfusion buffer is changed to KHBB containingThe perfusion buffer is changed to KHBB containing
2020µM HC-3.µM HC-3.
The potent choline uptake inhibitor is included to preventThe potent choline uptake inhibitor is included to prevent
the reuptake of any [the reuptake of any [33
H]choline formed from theH]choline formed from the
hydrolysis of [hydrolysis of [33
H]Ach.H]Ach.
The evoked release has been shown to be mostlyThe evoked release has been shown to be mostly
[[33
H]Ach rather than [H]Ach rather than [33
H]choline, whereas spontaneousH]choline, whereas spontaneous
release under control, drug-free conditions is mostlyrelease under control, drug-free conditions is mostly
[[33
H]choline.H]choline.
14. EvaluationEvaluation::
Percentage of fractional release is calculated for eachPercentage of fractional release is calculated for each
fraction.fraction.
Percent fractional release is defined as the amount ofPercent fractional release is defined as the amount of
radio-labeled compound released divided by amountradio-labeled compound released divided by amount
present in the tissue.present in the tissue.
Spontaneous release (SP) values are average of twoSpontaneous release (SP) values are average of two
fractions preceding the first fraction in that range afterfractions preceding the first fraction in that range after
the stimulation period.the stimulation period.
Stimulated (S) values are the summed differencesStimulated (S) values are the summed differences
between the percent fractional release during thebetween the percent fractional release during the
stimulation and appropriate SP values.stimulation and appropriate SP values.
15. A novel in vitro model for screening and evaluation of
anti-asthenopia
Purpose and Rationale:Purpose and Rationale:
AsthenopiaAsthenopia or eye strain is an ophthalmologicalor eye strain is an ophthalmological
conditioncondition
fatigue,fatigue,
red eyes, eye strain,red eyes, eye strain,
pain in or around the eyespain in or around the eyes
blurred vision, headache andblurred vision, headache and
occasional double vision.occasional double vision.
16. Symptoms often occur after reading, computer work, orSymptoms often occur after reading, computer work, or
other activities that involve tedious visual tasks.other activities that involve tedious visual tasks.
Author undertook study to develop a simple in vitroAuthor undertook study to develop a simple in vitro
model that can replicate fatiguing of ciliary muscle,model that can replicate fatiguing of ciliary muscle,
A novel technique thus developed uses ciliary muscles
removed from rabbit eyeballs.
The technique can be used to evaluate and screen drug
candidates under development to treat patients suffering
from asthenopia
17. ProcedureProcedure
Reagent :- 1) Cyanocobalamine.Reagent :- 1) Cyanocobalamine.
2) Acetylcholine chloride.2) Acetylcholine chloride.
3) Ketamine hydrochloride.3) Ketamine hydrochloride.
4) Xylazine hydrochloride4) Xylazine hydrochloride
Animal :- Male New Zealand white rabbits weighing aboutAnimal :- Male New Zealand white rabbits weighing about
3 kg (12 week-old)3 kg (12 week-old)
Experimental protocol:-Experimental protocol:-
Rabbits were anesthetized with intramuscular injection of
ketamine hydrochloride and xylazine hydrochloride(20
and 10 mg/kg, respectively)
The eyeball taken from the rabbits was sclerotonized
and amputated into half at the equatorial position.
18. The ciliary muscle was carefully ablated from the sclera
after removal of the crystalline lens and then cut into a
strip of 3 mm in width and 6 mm in length.
The ciliary muscle was suspended at 37C in a Magnus
tube filled with Krebs-Henseleit (KH) solution bubbled
with a mixed gas of 5% carbon dioxide and 95% oxygen
.
Tension was applied at a loading weight of 0.4 g using a
tension transducer
The ciliary muscle can be stimulated electrically,
mechanically, or chemically.
Author use a chemical stimulant, acetylcholine, involved
in ciliary activity
19. After a 30-min equilibration of the suspended muscle in
KH solution, the ciliary muscle was stimulated by the
addition of 10-4
mol/L acetylcholine.
The resultant tension was monitored as a function of
time until it has reached a plateau value.
The ciliary muscle was then washed with KH solution to
bring the tension to baseline.
Upon establishment of the baseline, the 2nd stimulation
was applied by the addition of 10-4
mol/L acetylcholine.
20. This process was repeated multiple times and at each
time.
After the 9th stimulation, the ciliary muscle was washed
with KH solution to establish the baseline.
Then KH solution containing varying concentrations of
cyanocobalamin was added to the ciliary muscle.
After incubation for 30 min at 37C, the 10th stimulation
was applied in the presence of cyanocobalamin.
The tension signal was monitored by the data collection
software.
21. The net tension (contraction rate) was calculated by
subtracting the baseline tension from the tension after
stimulation.
The percent change in contraction rate was calculated
by dividing the net tension of the 2nd or subsequent
acetylcholine stimulation (the i-th stimulation) by the net
tension of the first stimulation, as shown by the following
equation:
Contraction
rate (%)
=
net tension of the 1st stimulation
100
net tension of the i-th stimulation
22. ==
tension of the i-th stimulation -baseline tension
tension of the 1st stimulation - baseline tension
100
All data are presented as the mean S.D. Dunnett’s
multiple comparison test was performed to analyze the
significance between two means
23. Conclusion:-
A novel in vitro model for asthenopia was developed
using ciliary muscles obtained from the eyeballs of
rabbits.
Using acetylcholine as a stimulant, fatiguing of the
muscle was produced.
which can be recovered by cyanocobalamin treatment.
The procedure is simple and consistent and can be used
to screen drug candidates to treat patients suffering
asthenopia.
24. NorepinephrineNorepinephrine
Norepinephrine acts as transmitter at post ganglionicNorepinephrine acts as transmitter at post ganglionic
sympathetic sites.sympathetic sites.
Norepinephrine is synthesized from dopamine byNorepinephrine is synthesized from dopamine by
dopamine β-hydroxylase.dopamine β-hydroxylase.
It is released from the adrenal medulla into the blood asIt is released from the adrenal medulla into the blood as
a hormone.a hormone.
Norepinephrine may be used for the indicationsNorepinephrine may be used for the indications
attention-deficit/hyperactivity disorder, depression andattention-deficit/hyperactivity disorder, depression and
hypotension.hypotension.
25. In vitro screening methods forIn vitro screening methods for
NorepinephrineNorepinephrine
Inhibition of [3H]-norepinephrine uptake in rat brain
synaptosomes.
Inhibition of norepinephrine uptake in patients with
major depression treated with paroxetine
26. Inhibition of [3H]-norepinephrine uptake in rat brain
synaptosomes
PURPOSE AND RATIONALE
The neuronal re-uptake mechanism for norepinephrine is
the most important physiological process for removing
and inactivating norepinephrine in the synaptic cleft.
This uptake is inhibited by cocaine, certain
phenylethylamines and antidepressants.
In the brain, the hypothalamus shows the highest level
and greatest uptake of noradrenaline.
Therefore, this region Is used for testing potential
antidepressant drugs
27. PROCEDURE
Tissue preparation
Male Wistar rats are decapitated and the brains rapidly
removed.
The hypothalamic region is prepared, weighed, and
homogenized in 9 volumes of ice-cold 0.32 M sucrose
solution using a Potter-Elvejhem homogenizer.
The homogenate is centrifuged at 1 000 g at 0–4 °C for
10 min. The supernatant is decanted and used for the
uptake experiments
28. Assay
200 μl of tissue suspension are incubated with 800 μl
62.5 nM 3H-norepinephrine in Krebs-Henseleit
bicarbonate buffer and 20 μl of the appropriate drug
concentration (or the vehicle) at 37 °C under a 95%
O2/5% CO2 atmosphere for 5 min.
For each assay, 3 tubes are incubated with 20 μl of
vehicle at 0 °C in an ice bath.
After incubation all tubes are immediately centrifuged at
4000 g for 10 min
29. The supernatant fluid is aspirated and the pellets
dissolved adding 1 ml of solubilizer (Triton X-100 + 50%
ethanol, 1 : 4).
The tubes are vigorously shaken, decanted into
scintillation vials, and counted in 10 ml of liquid
scintillation cocktail
Active uptake is the difference between cpm at 37 °C
and 0 °C.
30. EVALUATION
• The percent inhibition at each drug concentration is
the mean of 3 determinations.
IC50 values are derived from log-probit analysis.
IC50 values for the standard drugs desipramine and
nortriptyline are around 20 nM.
31. 5-HT5-HT
5-HT is a monoamin neurotransmitter synthesized in5-HT is a monoamin neurotransmitter synthesized in
serotonergic neuron in the central nervous system (CNS)serotonergic neuron in the central nervous system (CNS)
In the central nervous system, serotonin is believed toIn the central nervous system, serotonin is believed to
play an important role as a neurotransmitter, in theplay an important role as a neurotransmitter, in the
inhibition of anger, aggression, body temperature, mood,inhibition of anger, aggression, body temperature, mood,
sleep, vomiting,, and appetitesleep, vomiting,, and appetite..
About 90 % of body content of 5-HT is localized in theAbout 90 % of body content of 5-HT is localized in the
intestine; most of rest in platelets and brainintestine; most of rest in platelets and brain
32. In vitro screening methods for 5-HTIn vitro screening methods for 5-HT
Inhibition of [3H]-serotonin uptake in synaptosomes
[3
H ] 5-HT binding assay
Contraction of isolated blood vessels
Contraction of Human isolated middle meningeal Artery.
33. Inhibition of [3H]-serotonin uptake in synaptosomes
PURPOSE AND RATIONALE
Altered serotoninergic function determines the mood
changes associated with affective disorders.
Antidepressants block the reuptake of 5-HT.
3
H-5-HT transport in brain has been found to be
saturable, sodium and temperature-dependent, to be
inhibited by several agents, such as ouabain, tryptamine
analogs, and tricyclic antidepressants.
Therefore, the test can be used to detect compounds
that inhibit serotonin uptake into rat brain synaptosomes
and may be potential antidepressants.
34. PROCEDURE
Tissue preparation
Male Wistar rats are decapitated and the brains rapidly
removed.
Either the whole brain or cerebellum or the
hypothalamus is weighed and homogenized in 9
volumes of ice-cold 0.32 M sucrose solution using a
Potter-Elvejhem homogenizer.
The homogenate is centrifuged at 1 000 g at 0–4 °C for
10 min. The supernatant is decanted and used for further
uptake experiments.
35. Assay
Two hundred μl of tissue suspension are mixed with 800
μl 62.5 nM 3
H-5-HT solution in Krebs-Henseleit
bicarbonate buffer and 20 μl of drug solution in the
appropriate concentration (or the vehicle as control).
The tubes are incubated at 37 °C under 95% O2/5% CO2
atmosphere for 5 min.
For each assay, 3 tubes are incubated with 20 μl of the
vehicle at 0 °C in an ice bath.
After incubation all tubes are immediately centrifuged at
4 000 g for 10 min.
36. The supernatant is aspirated and the pellets are
dissolved by adding 1 ml of solubilizer (Triton X100 +
50% ethanol, 1 + 4).
The tubes are vigorously shaken, decanted into
scintillation vials, and counted in 10 ml of liquid
scintillation counting cocktail.
Active uptake is the difference between cpm at 37 °C
and 0 °C.
37. EVALUATION
The percent inhibition of each drug concentration is the
mean of 3 determinations.
IC50 values are calculated from log-probit analyses.
38. [3
H ] 5-HT binding assay
PURPOSE AND RATIONALE
[3
H ] 5-HT binding assay is done for screening of
potential antimigraine drugs.
The assay is performed using rat or bovine tissue in the
presence spiroperidol.
Which inhibit the binding 5-HT to 5-HT1A and 5-HT2
receptors.
39. PROCEDURE:-PROCEDURE:-
Male wistar rats are used for assay.Male wistar rats are used for assay.
The rats are sacrificed, decapitated and their straitaThe rats are sacrificed, decapitated and their straita
removed and weight.removed and weight.
These are homogenized in 20 volumes of 0.05M trisThese are homogenized in 20 volumes of 0.05M tris
buffer, pH 7.7 and subsequently centrifused at 48000gbuffer, pH 7.7 and subsequently centrifused at 48000g
foe 10 mins.foe 10 mins.
The supernatant is discarded and pallets suspended inThe supernatant is discarded and pallets suspended in
same volume of 0.05M tris buffer and incubated at 37same volume of 0.05M tris buffer and incubated at 37oo
cc
for 10 minutes.for 10 minutes.
This is again at 48000g for 10 min.This is again at 48000g for 10 min.
40. The final pellet is suspended in 0.05 M Tris bufferThe final pellet is suspended in 0.05 M Tris buffer
containing 10 mM pargyline, 4 mM calcium chloride andcontaining 10 mM pargyline, 4 mM calcium chloride and
0.1% ascorbic acid.0.1% ascorbic acid.
The binding assay consist of 50The binding assay consist of 50 µµll [3
H ] 5-HT , 5050 µµl ofl of
spiroperidol (final concentration 1spiroperidol (final concentration 1 µµM), 800M), 800 µµl of tissuel of tissue
preparation , 80preparation , 80 µµl of 0.05 M tris buffer with calciuml of 0.05 M tris buffer with calcium
chloride , pargyline and ascorbic acid and 20chloride , pargyline and ascorbic acid and 20 µµl ofl of
vehicle/ 5-HT / test drug.vehicle/ 5-HT / test drug.
Following incubation at 25Following incubation at 25 oCoC
for 15 min, the binding isfor 15 min, the binding is
terminated by vacuum filtration through Whatman GF/Bterminated by vacuum filtration through Whatman GF/B
filtersfilters
The filters are then washed twice using 5 ml of ice-coldThe filters are then washed twice using 5 ml of ice-cold
0.05 M Tris buffer0.05 M Tris buffer
41. Radioactivity is determined in 10 ml of liquiscintRadioactivity is determined in 10 ml of liquiscint
scintillation cocktail.scintillation cocktail.
Evaluation :-Evaluation :-
Specific binding is determined in the presence orSpecific binding is determined in the presence or
absence of 10absence of 10-5-5
M 5-HTM 5-HT
ICIC5050 value are determined from percent specific binding atvalue are determined from percent specific binding at
each concentrationeach concentration
The KThe Kii value is determined by cheng prusoff equation.value is determined by cheng prusoff equation.
42. cheng prusoff equationcheng prusoff equation
KKii ==
IC50
1+ [(L)] / KD
[(L)] = The concentration of free radioligand used
for assay.
KD = Dissociation constant of radioligand for
receptor.
K = absolute inhibition constant.K = absolute inhibition constant.
43. ReferencesReferences
H. Gerard Vogel and Wolfgang H. Vogel, “DrugH. Gerard Vogel and Wolfgang H. Vogel, “Drug
Discovery and Evaluation: Pharmacological Assays”,Discovery and Evaluation: Pharmacological Assays”,
22ndnd
Edition, 2002, Springer Publications.Edition, 2002, Springer Publications.
S. K. Gupta, “Drug Screening Methods”, 1S. K. Gupta, “Drug Screening Methods”, 1stst
Edition,Edition,
2004, Jaypee Series,2004, Jaypee Series,
““Evaluation of sandalwood oil treatment during growthEvaluation of sandalwood oil treatment during growth
spurt period on the learning and memory in rats” byspurt period on the learning and memory in rats” by
Mr.Shidharkumar S. Biradar.Mr.Shidharkumar S. Biradar.
Iwao Kastuyama , Tsutomu Arakawa ,A novel in vitro
model for screening and evaluation of anti-asthenopia
J. Pharmacology sci. 93.222-224(2003)