Serotonin receptors

Transduction mechanisms
Agonists
Antagonists
Inverse agonists
Positive allosteric modulators
Negative allosteric modulators

Serotonin receptors are a group of G protein-coupled receptors and ligand-gated ion channels found in the central nervous system and peripheral nervous system. They are involved in the transmission of signals in the brain and play a key role in influencing mood, cognition, and perception. Serotonin receptors are the target of a variety of pharmacological agents, including several types of antidepressants and antipsychotics.

Types of Serotonin Receptors

Serotonin receptors are classified into several types, based on their structure and function:

• 5-HT1 receptors: These receptors are involved in inhibiting adenylate cyclase activity and function primarily as autoreceptors, regulating the release of serotonin itself.
• 5-HT2 receptors: These receptors are linked to the phosphoinositide pathway and are involved in the modulation of neurotransmitter release.
• 5-HT3 receptors: The only serotonin receptor that functions as a ligand-gated ion channel, involved in fast synaptic transmission.
• 5-HT4, 5-HT5, 5-HT6, and 5-HT7 receptors: These receptors are involved in stimulating adenylate cyclase and have various effects on neuronal excitability, neuroendocrine secretion, and reflex pathways.

Function

Serotonin receptors modulate the release of many neurotransmitters, as well as many hormones and other signaling molecules. They are implicated in numerous physiological processes including the regulation of mood, appetite, sleep, muscle contraction, and cognitive functions including memory and learning.

Clinical Significance

Alterations in serotonin receptor function can result in various psychiatric and neurological disorders, such as depression, anxiety, schizophrenia, and migraines. Drugs that modulate serotonin receptor activity are used in the treatment of these conditions. For example, selective serotonin reuptake inhibitors (SSRIs) indirectly affect serotonin receptor activity by increasing the level of serotonin available in the brain.

Research

Research on serotonin receptors continues to be a vibrant field, with ongoing studies aimed at discovering novel drugs that can more effectively target these receptors and treat serotonin-related disorders. Understanding the precise actions of different serotonin receptor subtypes is crucial for the development of drugs with better efficacy and fewer side effects.