The document summarizes different mechanisms of hormone signal transduction. It describes how hormones bind to cell surface or intracellular receptors which then activate intracellular signaling pathways using second messengers like cAMP, IP3, DAG, calcium. These second messengers go on to affect cell functions like glycogen breakdown, lipid metabolism, transcription etc. through kinases and other effector proteins. The document also discusses G-protein coupled receptor pathway and steroid hormone signaling pathway involving hormone-receptor complexes in the cytoplasm and nucleus.
A chemical substance produced in the body that controls and regulates the activity of certain cells or organs. Many hormones are secreted by special glands, such as thyroid hormone produced by the thyroid gland.
A chemical substance produced in the body that controls and regulates the activity of certain cells or organs. Many hormones are secreted by special glands, such as thyroid hormone produced by the thyroid gland.
Biochemistry Of Hormones
Contains All Important topics with best key points....
Made By Sanjay kumar (Student Of PharmD Faculty of Pharmacy Hamdard University)
Gastrointestinal Hormones by Pandian M, Dept of Physiology DYPMCKOP, for MBBS...Pandian M
Classify GIT hormones
List the source and functions of different GI hormones
Explain the mechanism of action and regulation of secretion of different GI Hormones
Describe the role of GI hormones in regulation of GI functions
Explain the dysfunctions produced by alteration in secretion of GIT hormones
Hormones are chemical messengers that are secreted directly into the blood, which carries them to organs and tissues of the body to exert their functions. There are many types of hormones that act on different aspects of bodily functions and processes.
Biochemistry Of Hormones
Contains All Important topics with best key points....
Made By Sanjay kumar (Student Of PharmD Faculty of Pharmacy Hamdard University)
Gastrointestinal Hormones by Pandian M, Dept of Physiology DYPMCKOP, for MBBS...Pandian M
Classify GIT hormones
List the source and functions of different GI hormones
Explain the mechanism of action and regulation of secretion of different GI Hormones
Describe the role of GI hormones in regulation of GI functions
Explain the dysfunctions produced by alteration in secretion of GIT hormones
Hormones are chemical messengers that are secreted directly into the blood, which carries them to organs and tissues of the body to exert their functions. There are many types of hormones that act on different aspects of bodily functions and processes.
This is a lecture I presented to the staff at the Edge of South Burlington about the importance of periworkout nutrition for hard trainers as well as ways to set up a diet around it.
High blood pressure causes many types of cardiovascular disease, such as stroke and heart failure, and renal disease. Peripheral arterial disease (PAD) is caused by atherosclerosis, which is the narrowing and / or blockage of the blood vessels in the legs.
G-protein (Guanine nucleotide-binding proteins)
Regulatory proteins
Comprise of three subunits (γ), subunits possess GTPase activity.
G proteins belong to the larger group of enzymes called GTPases.
Regaulate guanine nucleotides GDP, GTP.
They bind and hydrolyze guanosine triphosphate (GTP) to guanosine diphosphate (GDP).
They are active 'on' when they are bound to GTP
They are inactive ‘off' when they are bound to GDP
General principles of signal transduction
G Protein-coupled Receptors (GPCRs): Structure and Mechanism.
GPCRs that Regulate Adenylyl Cyclase.
GPCRs that Activate Phospholipase C.
GPCRs that Regulate Ion Channels.
GPCRs that Regulate Gene Transcription.
GPCRs are the largest and most diverse group of integral membrane proteins. These proteins are used by cells to convert extracellular signals into intracellular responses and mediate most of our physiological responses to hormones, neurotransmitters as well as responses to vision, olfaction and taste signal. They mediate most of our and environmental stimulants, and so have a great potential as therapeutic targets for a broad spectrum of diseases. At the most basic level, all GPCRS are characterized by the presence of seven membrane-spanning alpha helical segments separated by alternating intracellular and extracellular loop regions. Coupling with G proteins, they are called seven-transmembrane receptors because they pass through the cell membrane seven times.
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
- ARTIFICIAL INTELLIGENCE AND ETHICS
- GENE THERAPY
- BEYOND BORDERS: GLOBAL INITIATIVES FOR DEMOCRATIZING LIFE SCIENCE TECHNOLOGIES AND PROMOTING ACCESS TO HEALTHCARE
- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
Anti ulcer drugs and their Advance pharmacology ||
Anti-ulcer drugs are medications used to prevent and treat ulcers in the stomach and upper part of the small intestine (duodenal ulcers). These ulcers are often caused by an imbalance between stomach acid and the mucosal lining, which protects the stomach lining.
||Scope: Overview of various classes of anti-ulcer drugs, their mechanisms of action, indications, side effects, and clinical considerations.
2. The hormone is “substances released from
ductless or endocrine glands directly to the
blood”.
A more modern definition of a hormone is
that it is synthesized by one type of cells &
transported through blood to act on another
type of cells.
3. Signal Transduction through G protein:
Action is through G protein coupled
receptors (GPCR).
Action of several hormones is effected
through this mechanism.
The GPCRs are transmembrane proteins with
7 helical segments spanning the membrane.
4. When any ligand binds, GPCRs activate heterotrimeric
GTP binding regulatory proteins (G-proteins).
The G-protein will interact with effector proteins
which may be enzymes or ion channel proteins, which
result in the desired effect.
Different types of G proteins are present in the cells
that are coupled with different receptors & activating
different effector proteins.
5. The extracellular messenger, the hormone (H)
combines with the specific receptor (R) on the
plasma membrane.
The H-R complex activates the regulatory
component of the protein designated as G-protein or
nucleotide regulatory protein.
G proteins – they can bind GTP & GDP.
The G-protein is a membrane protein consisting of α,
β and γ subunits.
6.
7. When the hormone receptor complex is formed, the
activated receptor stimulates the G protein, which
carries the excitation signal to adenylate cyclase.
The hormone is not passed through the membrane; but
only the signal is passed; hence this mechanism is
called signal transduction.
The adenyl cyclase is embedded in the plasma
membrane.
8. When activated, GTP binds & β-γ subunits dissociate
from the α subunit.
Adenylate cyclase is activated by Gα – GTP.
The binding of hormone to the receptor triggers a
configurational change in the G protein which induces
the release of bound GDP & allows GTP to bind.
The hormone has an amplified response, since several
molecules of Gα – GTP are formed.
9.
10. The active Gα – GTP is immediately inactivated by
GTPase.
The Gα – GDP form is inactive.
The activation is switched off when the GTP is
hydrolysed to GDP by the GTPase activity of the α
subunit.
The α subunit, which is bound to GDP, can re-
associate with β and γ subunits.
The GTP-GDP exchange rate decides the activity of
adenyl cyclase.
11.
12. Adenyl cyclase or adenylate cyclase converts
ATP to cAMP (3',5'-cyclic AMP) &
phosphodiesterase hydrolyses cAMP to 5' AMP.
Cyclic AMP is a second messenger produced in
the cell in response to activation of adenylate
cyclase by active G protein.
During hormonal stimulation, cyclic AMP level
in the cell increases several times.
13.
14. Acts as second messenger in the cell.
Regulates glycogen metabolism – increased
cAMP produces breakdown of glycogen
(glycogenolysis).
Regulates TGL metabolism – increased cAMP
produces lipolysis (breakdown of TGL).
cAMP stimulates protein kinases.
cAMP modulates transcription & translation.
15. cAMP involved in steroid biosynthesis.
cAMP regulates permeability of cell
membranes to water, Na+, K+ & calcium.
Involved in regulation insulin secretion,
catecholamine & melatonin synthesis.
Histamine increases cAMP, which increases
gastric secretion.
16. cGMP involved in phosphorylation of
proteins. E.g. acetyl choline in smooth muscle.
Role in vasodilation:
Nitroglycerine, cerine, sodium nitrite etc.
causes smooth muscle relaxation &
vasodilation by increasing cGMP.
Role in action of neurotransmitters:
GABA has been claimed to change cGMP
levels in cerebral tissues.
17. Role in prostaglandin synthesis:
PG-F2 require cGMP for its action.
Role in insulin actions:
Insulin action in some tissues is mediated
through cGMP, which activates protein
kinases.
Role in vasodilation produced by nitric oxide:
NO produces vasodilation & lowering BP by
increasing cGMP.
18. Calcium is intracellular regulator of cell
function.
Intracellular calcium level is low than
extracellular calcium.
3 types of calcium transport systems:
Voltage gated calcium channel.
Sodium/calcium antiport transporter.
Calcium transporting ATPase.
19. This type of signal transduction is
phospholipase C that hydrolyses
phosphatidyl inositol to 1,4,5-Inositol
triphosphate (IP3) & Diacyl Glycerol (DAG) that
act as second messengers.
PIP3 (Phosphatidyl Inositol 3,4,5- phosphate) is
another second messenger produced by the
action of a phosphoinositide kinase.
20. The phospholipase C may be activated either
by G proteins or calcium ions.
DAG can also be generated by the action of
phospholipase D that produces phosphatidic
acid which is hydrolyzed to DAG.
21. The steroid & thyroid hormones are included
in this group.
They diffuse through plasma membrane &
bind to the receptors in the cytoplasm.
The hormone receptor (HR) complex is
formed in the cytoplasm.
22. The complex is then translocated to the
nucleus.
Steroid hormone receptor proteins have a
molecular weight of about 80-100 kD.
Each monomer binds to a single steroid
molecule at a hydrophobic site, but on
binding to genes they dimerise.
23. The HR complex binds to HRE (hormone
responsive element).
HRE increase transcriptional activity.
Newly formed mRNA is translated to specific
protein, which brings metabolic effects.
Steroid hormones influence gene expression
& rate of transcription is also increased.
24. Textbook of Biochemistry – DM Vasudevan
Textbook of Biochemistry – U Satyanarayana
Textbook of Biochemistry – MN Chatterjea