5-hydroxytryptamine receptor 1A (5-HT1A) (5-HT1A)

The 5-hydroxytryptamine receptor 1A (5-HT1A) is a G protein-coupled receptor (GPCR) that serves as a major inhibitory serotonin receptor in the central nervous system (UniProt: P08908). It is expressed as a presynaptic autoreceptor in the raphe nuclei and as a postsynaptic receptor in the hippocampus and cerebral cortex (PubMed: 29034483). Activation of 5-HT1A receptors typically inhibits adenylate cyclase and opens G protein-gated inwardly rectifying potassium (GIRK) channels, leading to neuronal hyperpolarization (NCBI Gene: 3350). This receptor plays a pivotal role in the regulation of mood, anxiety, and the stress response, making it a primary target for anxiolytic and antidepressant drugs like buspirone (StatPearls: Serotonin Receptors). Furthermore, 5-HT1A signaling is implicated in neurogenesis and has been explored as a target for neurodegenerative diseases such as Parkinson's and Alzheimer's (PubMed: 24976245). Its complex role in modulating neurotransmitter release, including dopamine and glutamate, underscores its importance in treating schizophrenia and other cognitive disorders.

Other names

Serotonin receptor 1AHTR1AADRB2L1ADRBRL1G-215-HT-1A

Drugs targeting the 5-HT1A receptor typically act as agonists or partial agonists to enhance serotonergic tone or as antagonists to block receptor activity, primarily modulating intracellular cAMP levels and neuronal excitability through Gi/o protein coupling (StatPearls: Serotonin Receptors).