Neonatal Estrogenization of the Female Rat : A Useful Model for Analysis of Hypothalamic Involvement of Gonadotropin Release
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概要
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Sterility induced by neonatal treatment with estrogen in the female rat was briefly reviewed in relation to plasma LH release and hypothalamic levels of LHRH. Intracranial implantation of a minute amount of androgen or estrogen into the hypothalamus of newborn female rats revealed that structures which are relatively wide spread in the hypothalamus are affected by these steroids. The correlation between levels of LH in plasma and levels of LHRH in the hypothalamus was examined. Ovariectomy induced a drastic decrease in the amount of LHRH in the mediobasal hypothalamus (MBH) in neonatally non-treated female rats, while it had little effect in neonatally estrogenized, sterile females. On the other hand, a positive feedback influence of estradiol benzoate (EB) and progesterone (P4) was detectable not only in the neonatally non-treated control but also in sterile rats given 10μg EB at 1-5 neonatal days. The amount of LHRH in the MBH was significantly decreased by EB + P4 in female rats given EB at 1-10 days neonatally. Intracerebroventricular (ICV) administration of noradrenaline (NA) evoked an increase in plasma LH and a small decrease in LHRH levels in the MBH, both in neonatally non-treated and neonatally EB-treated rats. But the response of the latter was smaller than the former. Thus, neonatal estrogenization might induce a less potent release of LHRH in response to ovariectomy and lev injected NA. Moreover, since the amount of LHRH in the MBH was significantly larger in the estrogenized rats than in neonatally non-treated females, it suggests that neonatal EB damaged not the system of production of LHRH but its releasing mechanism. The importance of studies on estrogen receptors and chemical factors which influence neuronal development was discussed in relation to sexual determination and differentiation.
- 社団法人日本動物学会の論文
著者
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Hayashi Shinji
Department Of Electrical And Electronic Engineering Faculty Of Engineering Kobe University
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Hayashi Shinji
Lab. Of Endocrinology Graduate School Of Integrated Sci. Yokohama City Univ.
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Aihara Masahiro
Department Of Biomolecular Science Faculty Of Science Toho University
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Hayashi Shinji
Department Of Anatomy And Embryology Tokyo Metropolitan Institute For Neuroscience
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AIHARA MASAHIRO
Department of Biology, Faculty of Science, Toho University
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