Abstract
The monoamine neurotransmitter, serotonin (5-HT, 5-hydroxytryptamine) was first linked to the control of food intake, and of feeding behavior, more than 20 years ago. Early studies showed that increasing CNS 5-HT levels by using 5-HT precursors such as tryptophan and 5-hydroxytryptophan (5-HTP) produced a significant reduction in the food intake of laboratory animals. Increasing 5-HT activity by other mechanisms such as directly administering 5-HT into the CNS, blocking synaptic 5-HT breakdown or directly stimulating (agonising) 5-HT receptors also produced this hypophagic response (BRAY a n d YORK 1 9 7 2 ; JESPERSON a n d SCHEEL-KRUGER 1973; BARRETT a n d MCSHERRY 1975; PINDER 1975; GARATTINI and SAMANI, 1976). Moreover, it was noted that neurotoxic lessioning of 5-HT neurons (with 5,7-dihyroxytrytamine, 5,7-DHT), or preventing 5-HT synthesis (using para-chlorophenylanine, pCPA) which depletes neuronal 5-HT, not only prevented 5-HT induced hypophagia but increased food intake (MACKENZIE et al. 1979).
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Halford, J.C.G., Blundell, J.E. (2000). Serotonin Drugs and the Treatment of Obesity. In: Lockwood, D.H., Heffner, T.C. (eds) Obesity: Pathology and Therapy. Handbook of Experimental Pharmacology, vol 149. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-59651-3_7
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