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Co-transmission & Non
Adrenergic Non Cholinergic
Transmission in ANS
Presented By
Poovarasan E
M.Pharm 1st Year
Department Of Pharmacology
PSG College Of Pharmacy
1
Neurotransmission
Contents :
• Introduction
• Co-transmission in Autonomic Nervous system
• ATP
• Neuropeptide Y
• Vasoactive intestinal peptide
• Substance P
• Calcitonin gene related peptide
• Non-adrenergic Noncholinergic transmission
• NANC Transmission by purines
• NANC Transmission in vascular responses by Endothelium derived factors
• Bibliography
2
Neurotransmission
Introduction:
Neurotransmission :
Neurotransmission is the process in which a neurochemical signal is
transmitted from one neuron to an adjacent neuron.
Neurotransmitter are released by the presynaptic neuron, travel across
the synaptic cleft, and then bind to and activate receptors on the
postsynaptic neuron.
The various neurotransmitters are
Acetylcholine
Amino acids ( asparagine, GABA, glutamate, and glycine)
Mono amines ( Dopamine, histamine, epinephrine and Norepinephrine)
Traces amines, purines, and variety of neuropeptides.
3
Neurotransmission
Neurotransmission 4
Source: Gene Tex
Neurotransmission in ANS:
1.Sympathetic neurotransmission:
Here , preganglionic neurotransmitter- Acetyl choline
Postganglionic neurotransmitter – Norepinephrine
2.Parasympathetic neurotransmission:
In parasympathetic neurotransmission,
Preganglionic neurotransmitter – Acetylcholine
Postganglionic neurotransmitter – Acetylcholine
5
Neurotransmission
Co-transmission in ANS
 Peripheral and central neurons release more than one active substance
when those gets stimulated. Such co released substance are called co-
transmitters.
This co-transmitters are stored in same neuron at different vesicles at the
same time ATP and NA stored in same vesicles.
The released co-transmitters may act as neuro modulators,
neurotransmitters or trophic factors.
6
Neurotransmission
Contd..
In ANS, besides the primary neurotransmitters ACh and NA, neurones
have been found elaborates:
 Purines
ATP, Adenosine
 Peptides
Vaso active intestinal peptide, NPY, Substance P, Enkephalins,
Somatostatin, CGRP
 Non-Peptides:
Nitric oxide (NO) & Prostaglandin
Neurotransmission 7
Neurotransmission 8
Source: Essentials of Medical
pharmacology by KD Tripathi
ATP
• ATP plays a role in sympathetic nerves as co-transmitter with NE
• Vas deferens of rodent is supplied with dense sympathetic innervation,
and stimulation of the nerves results in biphasic mechanical response
that consists initial rapid followed by sustained contraction.
• The first phase of the response is mediated by ATP acting on
postjunctional P2X Receptors, whereas the second phase is mediated by
NE acting on α1 receptors
9
Neurotransmission
Contd..
• When ATP is released into the neuroeffector junction , it gets
metabolized by membrane bound nucleotidases to ADP, AMP and
Adenosine.
• ATP and its metabolites may also acts on presynaptic P2 receptors.
So ATP also acts as neuromodulator.
Neurotransmission 10
Neuropeptide Y(NPY)
• NPY is colocalized and co-released with NE and ATP in sympathetic
nerves especially those innervating blood vessels and it causes
constriction of blood vessels.
• NPY also exerts prejunctional modulatory effects on transmitter
release and synthesis.
11
Neurotransmission
Functions of Neuropeptide-Y:
• Direct postjunctional contractile effects by acts on Y1 subtype
receptor.
• NPY act prejunctionally to inhibit the release of NE, DA, Ach, CGRP ,
and substance –P by inhibition of Ca2+ channels, activation of K+
channels.
• Potentiation of the contractile effects of the other sympathetic co-
transmitters.
Neurotransmission 12
Vasoactive Intestinal Peptide(VIP)
• Vasoactive Intestinal Peptide (VIP) co-released with ACh
parasympathetic division of autonomic nerves system.
• VIP regulates the secretions of saliva during cholinergic stimulation
and it partly contributes in vasodilation.
• VIP may be involved in parasympathetic responses in trachea and in
the GI tract, where it facilitate sphincter relaxation.
13
Neurotransmission
Substance P:
• It is co-transmitter with acetylcholine.
• Substance P released from sensory nerves and it mediate
inflammation, it includes airway smooth muscle contraction.
• It can cause vasodilatation with increased with increased plasma
extravasation and exudation.
• It contracts smooth muscles binding NK2 receptor.
Neurotransmission 14
Calcitonin gene related peptide(CGRP)
CGRP is a potent vasodilator and useful for treating vascular related
disease.
The receptor for CGRP is G-protein coupled receptors composed of
three functional proteins.
It plays an important role in vascular tone regulation and used
migraine and other vascular related diseases like hypertension.
Neurotransmission 15
Enkephalins:
Enkephalins are endogenous opioid pentapeptides that are produced
mainly in adrenal medulla and other peripheral tissues.
It plays the role of neurotransmitter or neuromodulator of specific
neuronal systems.
Enkephalins stimulate acid secretion and inhibit pancreatic enzyme
and sodium bicarbonates from pancreas.
Neurotransmission 16
Non-adrenergic Non-cholinergic transmission
• Non-adrenergic non-cholinergic (NANC) transmission/mediators describes a
part of autonomic nervous systems which dose not use acetylcholine or
noradrenaline as transmitters.
• NANC transmitters includes ATP, NO, NPY, VIP, GABA, DA, etc.
• Nonadrenergic, noncholinergic (NANC) transmission has been demonstrated
in the autonomic innervation of the gut, vas deferens, urinary tract, salivary
glands, and certain bloods where nerve stimulation causes limited response
in presence of certain adrenergic and cholinergic blocking agents.
17
Neurotransmission
Neurotransmission 18
Nonadrenergic Noncholinergic transmission by
purines
• Some of the NANC fibres are motor fibres that cause the release of
purines (ATP, adenosine etc.)
• Purines are derived from breakdown of ATP.
• The main effects of adenosine are: vasodilatation, inhibition of platelet
aggregation, bronchoconstriction and neuroprotection during ischaemia.
19
Neurotransmission
Contd..
• Other NANC fibres are some sensory fibres and these are activated by
sensory inputs and these sensory fibres release peptide transmitters(
e.g. VIP, CGRP, NPY) are potent agonists at autonomic effector tissues.
• The purinergic receptor can be classified into two types
• Receptor for adenosine(P1) and subtypes ( A1,A2A,A2B,A3)
• Receptor for ATP (P2X and P2Y receptors )
Neurotransmission 20
Neurotransmission 21
Source: Goodman and Gilman’s The
pharmacological basis of therapeutics
NANC Transmission in vascular responses by
Endothelium derived factors
• Nitric oxide and endothelins have also been identified as potentially
important NANC transmitters in vascular responses.
• In response to a variety of vasoactive agents and even physical stimuli the
endothelial cells release a short lived vasodilator called as endothelium
derived releasing factor ( EDRF) which has been identified as nitric oxide (
NO)
• Stimulation muscarinic receptors by exogenously administered ACh causes
release of nitric oxide which diffuses smooth muscle to cause relaxation by
activating guanyl cyclase and increases concentration cGMP which cause
relaxation of smooth muscle.
22
Neurotransmission
Contd..
• It plays an important role in vasodilation and hyperpolarization of the
smooth muscle.
• The endothelin peptides contribute to the maintenance of vascular
homeostasis by reversing the response of nitric oxide.
Neurotransmission 23
Bibliography:
• Essentials of MEDICAL PHARMACOLOGY by KD Tripathi
• Principles of pharmacology by HL Sharma and KK Sharma
• Goodman and Gilman’s The pharmacological basis of therapeutics
• Encyclopaedic Reference of Molecular Pharmacology.
• www.google.com
24
Neurotransmission
25
Neurotransmission

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Non adrenergic and Non cholinergic transmission

  • 1. Co-transmission & Non Adrenergic Non Cholinergic Transmission in ANS Presented By Poovarasan E M.Pharm 1st Year Department Of Pharmacology PSG College Of Pharmacy 1 Neurotransmission
  • 2. Contents : • Introduction • Co-transmission in Autonomic Nervous system • ATP • Neuropeptide Y • Vasoactive intestinal peptide • Substance P • Calcitonin gene related peptide • Non-adrenergic Noncholinergic transmission • NANC Transmission by purines • NANC Transmission in vascular responses by Endothelium derived factors • Bibliography 2 Neurotransmission
  • 3. Introduction: Neurotransmission : Neurotransmission is the process in which a neurochemical signal is transmitted from one neuron to an adjacent neuron. Neurotransmitter are released by the presynaptic neuron, travel across the synaptic cleft, and then bind to and activate receptors on the postsynaptic neuron. The various neurotransmitters are Acetylcholine Amino acids ( asparagine, GABA, glutamate, and glycine) Mono amines ( Dopamine, histamine, epinephrine and Norepinephrine) Traces amines, purines, and variety of neuropeptides. 3 Neurotransmission
  • 5. Neurotransmission in ANS: 1.Sympathetic neurotransmission: Here , preganglionic neurotransmitter- Acetyl choline Postganglionic neurotransmitter – Norepinephrine 2.Parasympathetic neurotransmission: In parasympathetic neurotransmission, Preganglionic neurotransmitter – Acetylcholine Postganglionic neurotransmitter – Acetylcholine 5 Neurotransmission
  • 6. Co-transmission in ANS  Peripheral and central neurons release more than one active substance when those gets stimulated. Such co released substance are called co- transmitters. This co-transmitters are stored in same neuron at different vesicles at the same time ATP and NA stored in same vesicles. The released co-transmitters may act as neuro modulators, neurotransmitters or trophic factors. 6 Neurotransmission
  • 7. Contd.. In ANS, besides the primary neurotransmitters ACh and NA, neurones have been found elaborates:  Purines ATP, Adenosine  Peptides Vaso active intestinal peptide, NPY, Substance P, Enkephalins, Somatostatin, CGRP  Non-Peptides: Nitric oxide (NO) & Prostaglandin Neurotransmission 7
  • 8. Neurotransmission 8 Source: Essentials of Medical pharmacology by KD Tripathi
  • 9. ATP • ATP plays a role in sympathetic nerves as co-transmitter with NE • Vas deferens of rodent is supplied with dense sympathetic innervation, and stimulation of the nerves results in biphasic mechanical response that consists initial rapid followed by sustained contraction. • The first phase of the response is mediated by ATP acting on postjunctional P2X Receptors, whereas the second phase is mediated by NE acting on α1 receptors 9 Neurotransmission
  • 10. Contd.. • When ATP is released into the neuroeffector junction , it gets metabolized by membrane bound nucleotidases to ADP, AMP and Adenosine. • ATP and its metabolites may also acts on presynaptic P2 receptors. So ATP also acts as neuromodulator. Neurotransmission 10
  • 11. Neuropeptide Y(NPY) • NPY is colocalized and co-released with NE and ATP in sympathetic nerves especially those innervating blood vessels and it causes constriction of blood vessels. • NPY also exerts prejunctional modulatory effects on transmitter release and synthesis. 11 Neurotransmission
  • 12. Functions of Neuropeptide-Y: • Direct postjunctional contractile effects by acts on Y1 subtype receptor. • NPY act prejunctionally to inhibit the release of NE, DA, Ach, CGRP , and substance –P by inhibition of Ca2+ channels, activation of K+ channels. • Potentiation of the contractile effects of the other sympathetic co- transmitters. Neurotransmission 12
  • 13. Vasoactive Intestinal Peptide(VIP) • Vasoactive Intestinal Peptide (VIP) co-released with ACh parasympathetic division of autonomic nerves system. • VIP regulates the secretions of saliva during cholinergic stimulation and it partly contributes in vasodilation. • VIP may be involved in parasympathetic responses in trachea and in the GI tract, where it facilitate sphincter relaxation. 13 Neurotransmission
  • 14. Substance P: • It is co-transmitter with acetylcholine. • Substance P released from sensory nerves and it mediate inflammation, it includes airway smooth muscle contraction. • It can cause vasodilatation with increased with increased plasma extravasation and exudation. • It contracts smooth muscles binding NK2 receptor. Neurotransmission 14
  • 15. Calcitonin gene related peptide(CGRP) CGRP is a potent vasodilator and useful for treating vascular related disease. The receptor for CGRP is G-protein coupled receptors composed of three functional proteins. It plays an important role in vascular tone regulation and used migraine and other vascular related diseases like hypertension. Neurotransmission 15
  • 16. Enkephalins: Enkephalins are endogenous opioid pentapeptides that are produced mainly in adrenal medulla and other peripheral tissues. It plays the role of neurotransmitter or neuromodulator of specific neuronal systems. Enkephalins stimulate acid secretion and inhibit pancreatic enzyme and sodium bicarbonates from pancreas. Neurotransmission 16
  • 17. Non-adrenergic Non-cholinergic transmission • Non-adrenergic non-cholinergic (NANC) transmission/mediators describes a part of autonomic nervous systems which dose not use acetylcholine or noradrenaline as transmitters. • NANC transmitters includes ATP, NO, NPY, VIP, GABA, DA, etc. • Nonadrenergic, noncholinergic (NANC) transmission has been demonstrated in the autonomic innervation of the gut, vas deferens, urinary tract, salivary glands, and certain bloods where nerve stimulation causes limited response in presence of certain adrenergic and cholinergic blocking agents. 17 Neurotransmission
  • 19. Nonadrenergic Noncholinergic transmission by purines • Some of the NANC fibres are motor fibres that cause the release of purines (ATP, adenosine etc.) • Purines are derived from breakdown of ATP. • The main effects of adenosine are: vasodilatation, inhibition of platelet aggregation, bronchoconstriction and neuroprotection during ischaemia. 19 Neurotransmission
  • 20. Contd.. • Other NANC fibres are some sensory fibres and these are activated by sensory inputs and these sensory fibres release peptide transmitters( e.g. VIP, CGRP, NPY) are potent agonists at autonomic effector tissues. • The purinergic receptor can be classified into two types • Receptor for adenosine(P1) and subtypes ( A1,A2A,A2B,A3) • Receptor for ATP (P2X and P2Y receptors ) Neurotransmission 20
  • 21. Neurotransmission 21 Source: Goodman and Gilman’s The pharmacological basis of therapeutics
  • 22. NANC Transmission in vascular responses by Endothelium derived factors • Nitric oxide and endothelins have also been identified as potentially important NANC transmitters in vascular responses. • In response to a variety of vasoactive agents and even physical stimuli the endothelial cells release a short lived vasodilator called as endothelium derived releasing factor ( EDRF) which has been identified as nitric oxide ( NO) • Stimulation muscarinic receptors by exogenously administered ACh causes release of nitric oxide which diffuses smooth muscle to cause relaxation by activating guanyl cyclase and increases concentration cGMP which cause relaxation of smooth muscle. 22 Neurotransmission
  • 23. Contd.. • It plays an important role in vasodilation and hyperpolarization of the smooth muscle. • The endothelin peptides contribute to the maintenance of vascular homeostasis by reversing the response of nitric oxide. Neurotransmission 23
  • 24. Bibliography: • Essentials of MEDICAL PHARMACOLOGY by KD Tripathi • Principles of pharmacology by HL Sharma and KK Sharma • Goodman and Gilman’s The pharmacological basis of therapeutics • Encyclopaedic Reference of Molecular Pharmacology. • www.google.com 24 Neurotransmission