Central 5-HT Receptors: Functions & Pharmacology (Barnes & Sharp, 1999)

Описание: I. Introduction to Central 5-HT Receptors
5-HT receptors are classified into seven distinct families.
There are 14 structurally distinct mammalian 5-HT subtypes.
Molecular biology has revealed specific functional properties.
Most are G-protein coupled metabotropic receptors.
The 5-HT3 receptor is unique as a ligand-gated ion channel.
Each receptor has a distinct distribution in the brain.
Drug tools have helped identify subtype-specific functions.

II. The 5-HT1 Receptor Family Overview
5-HT1A receptors are found in the hippocampus and raphe nuclei.
5-HT1A agonists like buspirone are used to treat anxiety.
5-HT1A activation causes neuronal hyperpolarisation.
5-HT1B receptors function as autoreceptors on nerve terminals.
5-HT1B receptors are located in the basal ganglia.
5-HT1D receptors are targets for anti-migraine drugs.
5-ht1E and 5-ht1F receptors show high affinity for 5-HT.

III. The 5-HT2 Receptor Family Functions
This family includes 5-HT2A, 5-HT2B, and 5-HT2C subtypes.
5-HT2A receptors are linked to hallucinogenic mechanisms.
Antipsychotic drugs often target the 5-HT2A receptor site.
5-HT2A receptors are found in the neocortex and caudate.
5-HT2C receptors regulate mood, anxiety, and feeding behavior.
5-HT2C activation can lead to hypophagia and hypolocomotion.
5-HT2B receptors are involved in stomach fundus contraction.

IV. The Unique 5-HT3 Receptor Channel
5-HT3 receptors mediate fast synaptic transmission in the brain.
They are ligand-gated ion channels, unlike other 5-HT receptors.
Antagonists like ondansetron are potent anti-emetic agents.
These receptors may modulate anxiety and cognitive function.
Highest levels are found in the brainstem dorsal vagal complex.
They modulate dopamine release in the nucleus accumbens.

V. Emerging Roles of 5-HT4 To 5-HT7
5-HT4 receptors enhance acetylcholine and dopamine release.
5-HT4 activation may facilitate cognitive performance.
5-ht6 receptors are targets for antipsychotic drugs.
5-ht6 receptors are abundant in the striatum and hippocampus.
5-HT7 receptors help regulate mammalian circadian rhythms.
5-HT7 receptors are found in the hypothalamus and thalamus.
5-ht5 receptors are the least understood of the subtypes.

VI. Additional Resource Support
See NourishED RFI's NotebookLM Resource Support Page.
https://notebooklm.google.com/noteboo...

VII. Source
Barnes, N. M., & Sharp, T. (1999). A Review of Central 5-HT Receptors and their Function. Neuropharmacology, 38(8), 1083–1152.

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