A protein identical to the yolk protein is stored in the testis in male red sea urchin, Pseudocentrotus depressus

Tatsuya Unuma, Tohru Suzuki, Tadahide Kurokawa, Takeshi Yamamoto, Toshio Akiyama

研究成果: Article

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Female sea urchins store the major yolk protein (MYP) in ovarian nutritive phagocytes before vitellogenesis. Using immunological procedures, we detected MYP in the testicular nutritive phagocytes of Pseudocentrotus depressus, the red sea urchin, and then compared the distribution of MYP between sexes during gametogenesis. MYP was purified from unfertilized eggs by ion exchange chromatography (Q Sepharose) and gel filtration (Superdex 200), and an antiserum (anti-MYP) was raised against MYP. Immunoblot analysis demonstrated that immature testes, as well as ovaries, contained a large quantity of MYP. Immunohistochemistry showed that MYP was distributed in the nutritive phagocytes occupying the follicular lumen in both males and females. In both sexes, as gametogenesis proceeded, the nutritive phagocytes degenerated and the gonadal lumen filled with gametes. MYP accumulated in ripe ova as a yolk protein in the mature ovary. In contrast, MYP was not detected in mature testes, because stored spermatozoa did not react with anti-MYP. We conclude that in male P. depressus, MYP is stored in the testicular nutritive phagocytes and utilized as the nutrient source for spermatogenesis.

元の言語English
ページ(範囲)92-97
ページ数6
ジャーナルBiological Bulletin
194
発行部数1
DOI
出版物ステータスPublished - 1998 2
外部発表Yes

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

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