Abstract
Serotonin is a neurotransmitter involved in a plethora of physi-ological functions exerted through its interaction with numerous receptor subtypes throughout the body. Using pharmacological approaches, four distinct receptor classes were defined: 5-HT1, 5-HT2, 5-HT3 and 5-HT4.27 However, molecular biological studies have provided both primary amino acid sequence and signal transduction data for a much larger than anticipated array of serotonin receptor subtypes, comprising seven major families: five 5-HT1, three 5-HT2, one 5-HT3, one 5-HT4, two 5-HT5, one 5-HT6 and one 5-HT7 receptor. The majority of these receptors are members of the G-proteincoupled receptor superfamily, which are characterized by a seven transmembrane (TM) spanning arrangement of a helices, proposed to form a barrel-like structure in the membrane.8 The cloned 5-HT1, receptors are: 5-HT1A,19,31 5-HT1B,1,44,28,37,52,54 5-HT1D,11,25,54 5-HT1E 33,39,55 and 5-HT1F.2,6,35 The major signal transduction pathway for each subtype is the inhibition of adenylate cyclase activity. The 5-HT2 receptors include: 5-HT2A,45 5-HT2B 20,32 and 5-HT2C.29 The primary signal transduction pathway of each of these receptors is phosphoinositide hydrolysis. The 5-HT3 receptor is not a G-protein-coupled receptor, it is a ligand-gated ion channel.36 The 5-HT5A and 5-HT5B receptors are similar in pharmacological profile, but not primary structure, to some 5-HT1, receptors.18,38 The signal transduction pathways for these subtypes remain elusive, and the 5-HT5B subtype appears to be a pseudogene in the human.23 Of the seven families, three signal their activation via the stimulation of cAMP production. The 5-HT4 receptor is a member of this cyclase stimulatory serotonin receptor set.12,22 Both 5-HT6 40 and 5-HT7, receptors7,34,44,47,48 are also coupled to stimulation of adenylate cyclase. Although one of the early subtypes to be characterized pharmacologically, the 5-HT4 receptor was the last to be cloned.
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Branchek, T.A., Adham, N., Gerald, C. (1998). Molecular Biology of 5-HT4 Receptors. In: Eglen, R.M. (eds) 5-HT4 Receptors in the Brain and Periphery. Biotechnology Intelligence Unit. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-05553-3_2
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DOI: https://doi.org/10.1007/978-3-662-05553-3_2
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