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Updated: Aug 13, 2026

Comprehensive Profiling of Dopamine Regulation in Substantia Nigra and Ventral Tegmental Area
Published on: August 10, 2012
Distribution of serotonin 5-hydroxytriptamine 1B (5-HT(1B)) receptors in the normal rat hypothalamus
I G Makarenko1, M M Meguid, M V Ugrumov
1Department of Surgery, SUNY University Hospital, Neuroscience Program, Surgical Metabolism and Nutrition Laboratory, SUNY Upstate Medical University, 750 East Adams Street, Syracuse, NY 13210, USA.
Abstract:
This is the study first attempting to evaluate distribution of neurons expressing serotonin 5-hydroxytriptamine 1B (5-HT(1B)) receptors in hypothalamus by using immunocytochemistry. The 5-HT(1B)-immunoreactive neurons were widely distributed in hypothalamus. Accumulations of 5-HT(1B) neurons occurred in magnocellular nuclei, supraoptic nucleus, paraventricular nucleus (dorsolateral part) and accessory perifornical, circular and retrochiasmatic nuclei. Magnocellular neurons manifested an intense immunostaining suggesting a high level of 5-HT(1B) receptors. Large and middle-sized neurons with different 5-HT(1B) staining patterns were scattered throughout lateral hypothalamus, periventricular nucleus and lateral preoptic area. Immunofluorescent double-labeling revealed a great overlapping of the distribution 5-HT(1B) neurons and dense network of neuropeptide Y-immunoreactive fibers in paraventricular, supraoptic and arcuate nuclei. The potential functional significance of 5-HT(1B) receptors in the 5-HT control of endocrine functions and feeding are discussed.
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