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      Estrogen Receptors Are Expressed in a Subset of Tyrosine Hydroxylase-Positive Neurons of the Anterior Preoptic Region in the Rainbow Trout

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          Abstract

          A double immunocytochemical procedure, with two different chromogens, was used to compare the respective distribution of estrogen receptor-immunoreactive cells and tyrosine hydroxylase-immunoreactive neurons on the same sections of the preoptic region of adult female rainbow trout ( Oncorhynchus mykiss). Estrogen receptor-immunoreactive cells were observed in the anterior preoptic region surrounding the preoptic recess and its large lateral extensions. Tyrosine hydroxylase-immunoreactive cells were consistently detected in the ventral and ventrolateral walls of the preoptic recess, in an area that was named nucleus preopticus pars anteroventralis. Dopamine immunohistochemistry and Dil retrograde transport studies indicated that part of these catecholaminergic neurons are dopaminergic and could project to the pituitary. Double staining studies showed consistently that most estrogen receptor-positive cells located ventral to the large extensions of the preoptic recess are also tyrosine hydroxylase-positive, indicating that this region is a major target for estradiol feedback. The results are discussed in relation to the role of the nucleus preopticus pars anteroventralis in mediating the negative feedback actions of estradiol on the secretion of gonadotrophin (GTH2) secretion. A hypothesis is drawn in order to explain the synchronizing role of estradiol at the time of ovulation in rainbow trout.

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          Author and article information

          Journal
          NEN
          Neuroendocrinology
          10.1159/issn.0028-3835
          Neuroendocrinology
          S. Karger AG
          0028-3835
          1423-0194
          1996
          1996
          09 April 2008
          : 63
          : 2
          : 156-165
          Affiliations
          aBiologie Cellulaire et Reproduction, URA CNRS 256, et bLaboratoire d’Endocrinologie Moléculaire des Poissons, INRA, Campus de Beaulieu, Rennes; cLaboratoire de Neurocytochimie Fonctionnelle, URA CNRS 339, Talence, France
          Article
          126952 Neuroendocrinology 1996;63:156–165
          10.1159/000126952
          9053780
          © 1996 S. Karger AG, Basel

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          Page count
          Pages: 10
          Categories
          Gonadotropin-Releasing Hormone and Gonadal Steroid Feedback

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