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Granisetron is a serotonin 5-HT 3 receptor antagonist used as an antiemetic to treat nausea and vomiting following chemotherapy and radiotherapy. Its main effect is to reduce the activity of the vagus nerve, which is a nerve that activates the vomiting center in the medulla oblongata. It does not have much effect on vomiting due to motion sickness.
The 5-HT 3 receptor antagonists suppress vomiting and nausea by inhibiting serotonin binding to the 5-HT 3 receptors. The highest concentration of 5-HT 3 receptors in the central nervous system are found in the STN and chemoreceptor trigger zone (CTZ), and 5-HT 3 antagonists may also suppress vomiting and nausea by acting at these sites. [29]
Cyproheptadine blocks 5-HT 2A, H1 and is a mild anticholinergic. Methysergide is a 5-HT 2A antagonist and nonselective 5-HT 1 receptor blocker. It causes retroperitoneal fibrosis and mediastinal fibrosis. [citation needed] Quetiapine blocks 5-HT 2A, 5-HT 1A, dopamine receptors D 1 and D 2, histamine receptor H1, and A1 adrenoreceptors.
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 2C receptors are the only G-protein coupled receptors known to undergo a post-transcriptional process of RNA editing. The 5-HT 2C receptor gene is found on the X-chromosome, Xq24. This gene product undergoes an RNA editing process leading to a decrease in agonist binding affinity, however antagonist binding remains unaltered.
2-Methyl-5-hydroxytryptamine (2-Methylserotonin, 2-Methyl-5-HT) is a tryptamine derivative closely related to the neurotransmitter serotonin which acts as a moderately selective full agonist at the 5-HT 3 receptor.
The H. T. Hackney Company is an American wholesale grocery distribution firm headquartered in Knoxville, Tennessee.Founded in 1891, the company has grown over the years to become one of the largest grocery wholesalers in the nation, with operations covering much of the Eastern United States. [3]
The genes encoding human 5-HT 3 receptors are located on chromosomes 11 (HTR3A, HTR3B) and 3 (HTR3C, HTR3D, HTR3E), so it appears that they have arisen from gene duplications. The genes HTR3A and HTR3B encode the 5-HT 3A and 5-HT 3B subunits and HTR3C, HTR3D and HTR3E encode the 5-HT 3C, 5-HT 3D and 5-HT 3E subunits.