Binding Properties and Photoperiodic Influence of Follicle-Stimulating Hormone Receptors in the Subtropical Wild Quail(Endocrinology)
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概要
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The knowledge on gonadotropin receptors in the wild avian species inhabiting in the subtropical zone is scanty. Basic properties and photoperiodism of follicle-stimulating hormone (FSH) binding to the testis or ovary of adult rain quails found abundantly in fields of northern India were studied. The binding of radioiodinated rat FSH to the particulate fraction of testicular homogenates of rain quails was competitively inhibited by mammalian FSHs but not by prolactin (PRL). Mammalian luteinizing hormones (LHs) showed some competition only at high concentrations. The Scatchard plot analysis of the binding of FSH showed a straight line, suggesting the presence of a single class of FSH-binding sites. The mean equilibrium constant of dissociation (Kd) of the specific binding and the number of binding sites were 1.16 (0.88-1.71, 95% confidence interval) nM and 3.06 (2.52-4.11) fmol/mg tissue. Adult males transferred from short-day (SD) to long-day (LD) photoperiods showed marked increases in testicular weight and total FSH binding per testis. FSH binding per unit weight tended to increase at the initial phase of photostimulation. In contrast to the male, photostimulated females showed no significant effect of LD exposure on the total FSH binding per ovary. The changes in ovarian weight after LD exposure were much smaller than those in testicular weight and the changes from the control (SD) value were statistically not significant. These results suggest that 1) specific FSH receptors are present in the gonad of the subtropical wild quail, and their binding properties were basically the same to those of FSH receptors previously reported in several temperate birds including domestic quails, 2) photoperiod is an effective environmental factor in the regulation of FSH binding to the testis but the ovarian FSH binding is not altered by LD photoperiods in this quail, and 3) photoperiodic effects on testicular FSH binding are accompanied by pronounced changes in the testicular weight.
- 社団法人日本動物学会の論文
- 1992-06-15
著者
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Kawashima Seiichiro
Zoological Institute, Graduate School of Science, University of Tokyo
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TSUTSUI Kazuyoshi
Department of Biology, School of Education, Waseda University
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Kawashima Seiichiro
Zoological Institute Faculty Of Science Hiroshima University
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Tsutsui Kazuyoshi
Department Of Radiation Biophysics Kobe University School Of Medicine
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SAXENA V.
Laboratory of Reproductive Biology, D. G. College
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SAXENA A.
Laboratory of Reproductive Biology, D. A. V. College
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Tsutsui Kazuyoshi
Department Of Biology School Of Education Waseda University
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Saxena A.
Laboratory Of Reproductive Biology D. A. V. College
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Saxena V.
Laboratory Of Reproductive Biology D. G. College
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Tsutsui Kazuyoshi
Department Of Biology Faculty Of Science Toyama University
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