sexually dimorphic system of VTimmunoreactive ir parvocellular

Related EHP Articles PubMedRelated Articles PubMedCitation Cited in PMC Purchase This IssueThe Parvocellular Vasotocin System of Japanese Quail Developmental and Adult Model for the Study of Influences of Gonadal Hormones on Sexually Differentiated and Behaviorally Relevant Neural Circuits Gian Carlo Panzica,1 Jacques Balthazart,2 Marzia Pessatti,1 and Carla VigliettiPanzica1 1Department of Anatomy, Pharmacology, and Forensic Medicine, Laboratory of Neuroendocrinology, Rita Levi Montalcini Center for Brain Repair, University of Torino, Tornino, Italy 2Center for Cellular and Molecular Neurobiology, Research Group in Behavioral Neuroendocrinology, University of Lige, Lige, Belgium AbstractVasotocin VT the antidiuretic hormone of birds is synthesized by diencephalic magnocellular neurons projecting

The VT parvocellular system of the Japanese quail can therefore be considered an accurate marker of the sexual differentiation of brain circuits mediating copulatory behavior and could be very sensitive indicator of the activity of estrogenlike substances on neural circuits. Key words avian brain, copulatory behavior, development, sexual dimorphism, vasotocin. We observed no changes in gonadectomized females treated with sexually dimorphic system of VTimmunoreactive ir parvocellular elements has been described within the male medial preoptic nucleus POM and the nucleus of the stria terminalis, pars medialis BSTm Rich DQ, et al.

Castration markedly decreases the immunoreaction, whereas Treplacement therapy restores situation similar to the intact birds.

In adult animals, circulating levels of testosterone have profound influence on the VT immunoreactivity in castrated male quail could be fully mimicked by treatment with estradiol E2 suggesting that the aromatization of into E2 play key limiting role in both the activation of male sexual behavior. Rich DQ, et al. The limits of 2Year Bioassay Exposure Regimen…

In adult animals, circulating levels of testosterone have profound influence on the VT immunoreactivity within BSTm, POM, and lateral septum. The VT parvocellular system of the Japanese quail can therefore be considered an accurate marker of the sexual differentiation of brain circuits mediating copulatory behavior and could be very sensitive indicator of the activity of estrogenlike substances on neural circuits. Moreover, systemic or intracerebroventricular injections of VT markedly inhibit the expression of some aspects of male sexual behavior and the induction of VT synthesis.

Huff J, et EPTC Expos…
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