Localization of growth hormone-releasing factor-like immunoreactivity in the hypothalamo-hypophysial system of some teleost species

Cell and Tissue Research
M OlivereauF Vandesande

Abstract

An antiserum to growth hormone-releasing factor (GRF) 1-44 was applied on brain and pituitary sections of nine teleost species. Immunoreactive (ir) perikarya were demonstrated in parvo- and magnocellular portions of the preoptic nucleus (PON) and occasionally in the nucleus lateralis tuberis. The two tracts originating in the PON ran ventro-laterally toward the optic chiasm and then caudally in the basal hypothalamus. In the pars distalis (PD) of the eel, carp, goldfish and salmonids, GRF-ir fibers did not enter the rostral PD and few fibers passed close to somatotropes. In Myoxocephalus and Mugil, a variable number of ir-fibers passed close to cells of the rostral and proximal PD. In the neurointermediate lobe, GRF-ir fibers were located exclusively in the neural tissue of the eel and trout. In goldfish, carp and Myoxocephalus, GRF-ir fibers entered the intermediate lobe. This antiserum also labeled corticotrops and, to a lesser extent, melanotrops in the pituitary of cyprinids. A variable number of perikarya contained both GRF and vasotocin in the PON of the eel. In all teleost species studied so far, the distribution patterns of GRF are different, and the function of the various adenohypophysial cell types appears to be diff...Continue Reading

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Citations

May 27, 2003·General and Comparative Endocrinology·M Javier Herrero-TurriónJuan M Lara
Oct 24, 2002·International Journal of Developmental Neuroscience : the Official Journal of the International Society for Developmental Neuroscience·Leandro Andrés MirandaGustavo Manuel Somoza
Jan 6, 2000·General and Comparative Endocrinology·R CardenasR E Peter
Dec 1, 1991·General and Comparative Endocrinology·M M MalagónF Gracia-Navarro

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