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Do gonadotrophin‐releasing hormone neurons express estrogen receptors in the rainbow trout? A double immunohistochemical study
Author(s) -
Navas José María,
Anglade Isabelle,
Bailhache Thierry,
Pakdel Farzad,
Breton Bernard,
Jégo Patrick,
Kah Olivier
Publication year - 1995
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/cne.903630309
Subject(s) - biology , medicine , endocrinology , hypothalamus , estrogen , estrogen receptor , preoptic area , cerebrum , rainbow trout , hormone , receptor , gonadotropin releasing hormone , central nervous system , luteinizing hormone , fish <actinopterygii> , cancer , fishery , breast cancer , biochemistry , genetics
A double immunocytochemical procedure, with two different chromogens, was used to compare the respective distributions of estrogen receptor‐immunoreactive cells and gonadotrophin‐releasing hormone‐immunoreactive neurons on the same sections of the brains of adult male and female rainbow trout ( Oncorhynchus mykiss ). Estrogen receptor‐immunoreactive cells were observed in the ventral and lateral telencephalon, the preoptic region, the mediobasal hypothalamus, and the ventromedial thalamic nucleus. Gonadotrophin‐releasing hormone immunoreactive perikarya were detected in the olfactory bulbs, the ventral telencephalon, the preoptic area, and the mediobasal hypothalamus. Double‐staining studies showed that, although some estrogen receptor‐positive cells were in close proximity to gonadotrophin releasing hormone‐immunoreactive perikarya, careful examination of 550 gonadotrophinreleasing hormone‐positive cells from five adult females and two adult males failed to demonstrate any evidence that gonadotrophin‐releasing hormone neurons coexpress estrogen receptor in the brain of the rainbow trout. The present study provides, for the first time in teleosts, morphological evidence that gonadotrophin‐releasing hormone neurons do not represent major direct targets for estradiol, suggesting that the positive feedback effects of estradiol onto the gonadotrophin‐releasing hormone system are likely to be conveyed via other cell populations. © 1995 Wiley‐Liss, Inc.