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INTRODUCTION TO AUTONOMIC PHARMACOLOGY: Part IV Adrenergic and cholinergic receptors.

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Presentation on theme: "INTRODUCTION TO AUTONOMIC PHARMACOLOGY: Part IV Adrenergic and cholinergic receptors."— Presentation transcript:

1 INTRODUCTION TO AUTONOMIC PHARMACOLOGY: Part IV Adrenergic and cholinergic receptors

2 Adrenergic Receptors: Receptors Activated by EPI/NE   -adrenergic receptors (Epinephrine>Isoproterenol)  -adrenergic receptors (Isoproterenol>Epinephrine)  1 -adrenergic receptors (Phenylephrine>Clonidine)  2 -adrenergic receptors (Clonidine>Phenylephrine)  1 -adrenergic receptors (EPI = NE)  2 -adrenergic receptors (EPI>NE)  3 -adrenergic receptors (NE>EPI)

3 Adrenergic Receptors: Signal Transduction

4 Signal Transduction by  1 - Adrenergic Receptors GqGq q q

5 Signal Transduction by  2 - and  - Adrenergic Receptors

6 Nicotinic Receptors (Activated by nicotine from tobacco) M 2 (Heart & SM) M 3 (Heart & SM) M 4 (SM & Glands) M 5 (?) N M (Neuromuscular) N Autonomic ganglia, Adrenal medulla & CNS (Blocked by Trimethaphan) (Blocked by Tubocurarine) (Defined by Molecular Cloning) Muscarinic Receptors (Activated by muscarine from Amanita muscaria) Cholinergic Receptors: Receptors Activated by Ach M 1 (Nerve Cells)

7 Cholinergic Receptors: Signal Transduction

8 Formation of IP 3 Formation of DAG Release of Intracellular Calcium Activation of PKC  subunit Inhibition of Adenylyl Cyclase Opening of Potassium Channels Activation of PLC GqGq Muscarinic Receptors  subunit GiGi


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