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The 5-HT 1B receptor as an example of a metabotropic serotonin receptor. Its crystallographic structure in ribbon representation. 5-HT receptors, 5-hydroxytryptamine receptors, or serotonin receptors, are a group of G protein-coupled receptor and ligand-gated ion channels found in the central and peripheral nervous systems.
The 5-HT 1A receptor is the most widespread of all the 5-HT receptors. In the central nervous system, 5-HT 1A receptors exist in the cerebral cortex, hippocampus, septum, amygdala, and raphe nucleus in high densities, while low amounts also exist in the basal ganglia and thalamus.
The 5-HT 2 receptors are a subfamily of 5-HT receptors that bind the endogenous neurotransmitter serotonin (5-hydroxytryptamine, 5-HT). [1] The 5-HT 2 subfamily consists of three G protein-coupled receptors (GPCRs) which are coupled to G q /G 11 and mediate excitatory neurotransmission, [2] including 5-HT 2A, 5-HT 2B, and 5-HT 2C.
Except for the serotonin 5-HT 3 receptor, a ligand-gated ion channel, all other 5-HT receptors are G-protein-coupled receptors (also called seven-transmembrane, or heptahelical receptors) that activate an intracellular second messenger cascade. [42] The 5-HT 5B receptor is present in rodents but not in humans.
The 5-HT 1 receptors are a subfamily of the 5-HT serotonin receptors that bind to the endogenous neurotransmitter serotonin (also known as 5-hydroxytryptamine, or 5-HT). [1] The 5-HT 1 subfamily consists of five G protein-coupled receptors (GPCRs) that share 40% to 63% overall sequence homology, including 5-HT 1A, 5-HT 1B, 5-HT 1D, 5-HT 1E, and 5-HT 1F. [2]
5-HT 1B receptors are widely distributed throughout the central nervous system with the highest concentrations found in the frontal cortex, basal ganglia, striatum, and the hippocampus. [8] The function of the 5-HT 1B receptor differs depending upon its location.
The 5-HT 7 receptor is a member of the GPCR superfamily of cell surface receptors and is activated by the neurotransmitter serotonin (5-hydroxytryptamine, 5-HT). [5] The 5-HT 7 receptor is coupled to G s (stimulates the production of the intracellular signaling molecule cAMP) [6] [7] and is expressed in a variety of human tissues, particularly in the brain, the gastrointestinal tract, and in ...
The receptor is located in the alimentary tract, urinary bladder, heart and adrenal gland as well as the central nervous system (CNS). [8] In the CNS the receptor appears in the putamen, caudate nucleus, nucleus accumbens, globus pallidus, and substantia nigra, and to a lesser extent in the neocortex, raphe, pontine nuclei, and some areas of the thalamus.