Immunochemical identification and partial characterization of female-specific serum proteins in white-edged rockfish,Sebastes taczanowskii |
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Authors: | Akihiro Takemura Akihiko Hara Kazunori Takano |
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Institution: | (1) Department of Biology and Aquaculture, Faculty of Fisheries, Hokkaido University, 041 Hakodate, Hokkaido, Japan;(2) Nanae Fish Culture Experimental Station, Faculty of Fisheries, Hokkaido University, 041-11 Nanae, Hokkaido, Japan |
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Abstract: | Synopsis Female-specific serum proteins (FSSPs) in white-edged rockfish,Sebastes taczanowskii, were identified and partially characterized by immunochemical procedures. Two FSSPs, which clearly reacted with antiserum
against egg proteins, were confirmed in the serum of mature females, and estrogen treatment induced similar FSSPs in the serum
of mature males. Hence, the FSSPs were considered to be vitellogenin. The vitellogenin concentration in female fish was high
during the vitellogenic period and low during gestation, parturition and the recovery period, indicating that vitellogenin
is used only for yolk formation in the oocytes and not as a direct nutritional source for developing embryos during gestation.
On the other hand, an FSSP (FS3), which was considered not to be vitellogenin, was also identified in the sera of mature females
and males after estradiol-17β administration by using an antiserum (a-FS3) that removed the components of the male serum and
egg extracts from the anti-mature female serum antiserum. Moreover, immunohistochemical observation with a-FS3 illustrated
that FS3 was a major constituent of the ovarian fluid but not of vitellogenic oocytes. The cross-reactivities of these FSSPs
among seven viviparous rockfishes demonstrated that vitellogenin existed in the sera of all rockfishes studied belonging to
the generaSebastes andSebastiscus, whereas FS3 was not present in several species ofSebastes. |
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Keywords: | Immunochemistry Antiserum Vitellogenin Female-specific protein Estrogen Seasonal change Pisces Scorpaenidae |
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