Low dose testosterone treatment at the critical period causes loss of sex difference in corticotropin-releasing hormone (CRH) neurons in the bed nucleus of the stria terminalis (BST) in association with loss of the estrous cyclicity
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- Funabashi Toshiya
- Dept. Neuroendocrinol., Yokohama City Univ. Graduate Sch. Med., Yokohama, Japan
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- Sano Akane
- Dept. Neuroendocrinol., Yokohama City Univ. Graduate Sch. Med., Yokohama, Japan
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- Kihara Akira
- Dept. Neuroendocrinol., Yokohama City Univ. Graduate Sch. Med., Yokohama, Japan
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- Kimura Fukuko
- Dept. Neuroendocrinol., Yokohama City Univ. Graduate Sch. Med., Yokohama, Japan
Bibliographic Information
- Other Title
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- ラットの脳の性分化臨界時期における低濃度テストステロン投与は連続発情を惹起し分界条床核の副腎皮質刺激ホルモン放出ホルモンニューロンの性差を消失させる
Abstract
We previously reported that the BST, as the medial preoptic area (mPOA), in female rats has significantly more CRH neurons than in male rats. In the present study, we examined whether low dose testosterone propionate (TP) affected sex difference in CRH neurons in association with changes in the estrous cyclicity. Neonatal female rats were injected sc with 1 μg or 5 μg TP at the age of 5 days. Control male and female rats were injected with sesame oil alone. Daily virginal smears were obtained from the age of 7 weeks and rats were seved to immunocytochemical processing at the age of 9-11 weeks. In control male and female rats, there was a significant sex difference in the number of CRH neurons in the BST and the mPOA, as we reported previously. One μg TP had no effect on the estrous cyclicity and the number of CRH neurons both in the BST and the mPOA. Sixty% of female rats injected with 5 μg TP were persistently estrous. The number of CRH neurons in the BST of these persitent estrous rats was significantly small, but that in the mPOA was not changed, compared to control female rats. We suggest that a low dose testosterone causes loss of sex difference in the number of CRH neurons in the BST and the estrous cyclicity in female rats and that CRH neurons in the BST is more sensitive than the mPOA to steroid milieu during the neonatal period. [Jpn J Physiol 54 Suppl:S221 (2004)]
Journal
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- Proceedings of Annual Meeting of the Physiological Society of Japan
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Proceedings of Annual Meeting of the Physiological Society of Japan 2004 (0), S221-S221, 2004
PHYSIOLOGICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001205727343744
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- NII Article ID
- 130007038629
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- Data Source
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- JaLC
- CiNii Articles
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- Abstract License Flag
- Disallowed