Graduate Thesis Or Dissertation
 

Neuroanatomical distribution of androgen and estrogen receptors in the brain of the roughskin newt, Taricha granulosa

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/vh53wz10b

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  • The gonadal steroids, testosterone and estradiol, are known to be important modulators of neuronal functions and behaviors in most vertebrate species. These steroid hormones also elicit changes in neuropeptide synthesis and secretion, alter specific neurohormone receptor levels, and alter neuronal morphology and electrophysiology. Many of the actions of androgens and estrogen are mediated by specific intracellular receptors found in certain regions of the brain. But where are these neuronal targets for androgens and estrogen found? The research in this thesis investigates the neuroanatomical distribution of androgen and estrogen receptors in the brain of a urodele amphibian, the roughskin newt, Taricha granulosa. Using immunocytochemistry with antibodies against these receptors, the distribution of both androgen and estrogen receptor-immunoreactive cells is described in the brain of this species. This study found brain regions that contain immunoreactive androgen receptors that have not previously been reported in poikilothermic vertebrates using other techniques. In addition, the distribution of estrogen receptor-immunoreactive cells in most brain areas, and the distribution of androgen receptor-immunoreactive cells in several brain areas, were found to be similar in this amphibian to those described in studies that employed in vivo autoradiographic techniques in other vertebrate species. This study suggests that the neuroanatomical distribution of gonadal steroid receptors is a relatively conserved trait in vertebrates. The widespread distribution of these receptors in the brain probably reflects the multiple functions that androgens and estrogen are known to have in the brain.
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