2004 Fiscal Year Final Research Report Summary
Neural regulatory systems for sexual and maternal behaviors and the sexual differentiatio
| Project/Area Number |
14540618
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生物形態・構造
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| Research Institution | Waseda University |
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Principal Investigator |
YAMANOUCHI Korehito Waseda University, Faculty of Human Sciences, Professor, 人間科学学術院・人間科学部, 教授 (10053357)
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| Project Period (FY) |
2002 – 2004
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| Keywords | lordosis / sexual differentiation / septum / estrogen beta receptor / serotonin / estrogen / maternal behaior / neonatal period |
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| Research Abstract |
1.lordosis-inhibitiory influence in the lateral system
The retrograde tracer (Fluoro-Gold, FG) was injected into the midbrain central gray(MCG) and immunohistochemical analysis for FG, estrogen a and βreceptors in the lateral septum(LS) was performed in male and female rats. As the results, (1)Number of FG-positive cells in the LS in females was larger than that in males, (2)Numerous βreceptor-immunopositive cells were found in the LS, compared to the a receptor immunopositive cells. Number of these cells containing estrogen β and α receptors was not influenced by exogenous estrogen. (3)Rate of β receptor containing cells in FG positive neurons in the LS was less than 20% in both male and female rats. When estradiol benzoate(EB) was injected to female rats on day 5 after birth and immunohistochemical analysis was performed after injection of FG into the MCG in adulthood, number of FG-positive neurons in the LS decreased to the male level.
2.Serotonergic neurons inhibiting lordosis behavior.
Three kinds of HT_<1A> receptor agonist ; +or +-8-OH-DPAT, buspirone, or an antagonist ; WAY-100635 were injected and sexual behavior was observed in estrogen-treated ovariectomized rats. As a result, the agonist suppressed acutely lordosis and the antagonist enhanced lordosis. In addition, other experiment using HPLC showed that contents of serotonin in the forebrain such as the septum, preoptic area and ventromedial hypothalamus of the females were higher than those in male rats.
3. Sex difference of maternal-like behavior in juvenile rats.
Observation of maternal behavior in juvenile rats showed 20 days-age male rats show retrieving behavior more frequently than females of same age. Incidence of retrieving behavior decreased on 30 days after birth. Injection of estrogen on day 5 after birth in female rats increased incidence of retrieving to the male level on day 20
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Research Products
(20 results)
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[Journal Article] Postnatal apoptosis, development, and sex difference in the lateral septum of rats2004
Author(s)
Tsukahara, S., inami, K., Maekawa, F., Kakeyama, M., Yokoyama, T., Yuji, M.Kitagawa, H., Kannan, Y., Yamanouchi, K.
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Journal Title
J.Comp.Neurol. 475
Pages: 177-187
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Effects of neonatal treatement with phytoestrogens, genistein and daizein, on sex difference in emale rat brain function : estrous cycle and lordosis2003
Author(s)
Kouki, T., Kishitake, M., Okamoto, M., Oosuka, I., Takebe M., Yamanouchi, K.
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Journal Title
Horm.Behav. 44
Pages: 140-145
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Effects of neonatal treatment with phytoestrogens ; genistein and daidzein on sex difference in female rat brain function : Estrous cycle and lordosis.2003
Author(s)
Kouki, T., Kishitake, M., Okamoto, M., Oosuka, I., Takebe, M., Yamanouchi, K.
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Journal Title
Horm.Behav. 44(2)
Pages: 140-145
Description
「研究成果報告書概要(欧文)」より
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[Book] 女と男の人間科学2004
Author(s)
山内兄人(編著)
Total Pages
204
Publisher
コロナ社
Description
「研究成果報告書概要(和文)」より
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[Book] 歯の人間科学2003
Author(s)
山内兄人
Total Pages
267
Publisher
コロナ社
Description
「研究成果報告書概要(和文)」より
