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Comparative distribution of mRNA encoding the growth hormone secretagogue‐receptor (GHS‐R) in Microcebus murinus (Primate, Lemurian) and rat forebrain and pituitary
Author(s) -
Mitchell Valérie,
Bouret Sebastien,
Beauvillain JeanClaude,
Schilling Alain,
Perret Martine,
Kordon Claude,
Epelbaum Jacques
Publication year - 2000
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/1096-9861(20010115)429:3<469::aid-cne8>3.0.co;2-#
Subject(s) - biology , forebrain , secretagogue , endocrinology , medicine , primate , growth hormone secretagogue receptor , neuroscience , growth hormone , hormone , central nervous system , secretion
The forebrain and pituitary sites of synthesis of growth hormone secretagogue‐receptor mRNA were identified in four adult lemurs ( Microcebus murinus ) by in situ hybridisation performed with a radiolabeled cRNA probe transcribed from human Growth Hormone Secretagogue‐Receptor cDNA. The cRNA sense and antisense probes were hybridised to cryostat sections containing structures extending from the rostral hypothalamus to its caudal limit as defined by the mammillary bodies. The pituitary gland and areas adjacent to the hypothalamus were also analyzed. For comparative purposes, sections from five adult rats containing these structures were hybridised with the same probes. The results point to a widespread distribution of Growth Hormone Secretagogue‐Receptor mRNA in the hypothalamus, hippocampal formation, and cerebellar cortex of both lemurs and rats. As in the rat, specific hybridisation was particularly dense in the arcuate nucleus. Significant species differences were observed in the periventricular nucleus, the ventromedial nucleus, the lateral hypothalamic area, and the pituitary gland. In contrast to the rat, the lemur exhibited marked labelling in the infundibular nucleus, the periventricular nucleus and the pars tuberalis of the pituitary gland, whereas no labeling was detectable in the ventromedial nucleus and the lateral hypothalamic area. These results are discussed in terms of difference between the control of growth hormone secretion, feeding behaviour and seasonal rhythmicity among murine species and primates. J. Comp. Neurol. 429:469–489, 2001. © 2000 Wiley‐Liss, Inc.