Changes in serum vitellogenin levels and immunohistochemical localization of vitellogenin in hepatic cells during ovarian development in the Japanese eel.

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  • OKUMURA HIROMI
    Division of Marine Biosciences, Graduate School of Fisheries Sciences Space Utilization Research Program, National Space Development Agency of Japan
  • SAEKI FUMIHIRO
    Division of Marine Biosciences, Graduate School of Fisheries Sciences
  • MATSUBARA HAJIME
    Division of Marine Biosciences, Graduate School of Fisheries Sciences
  • ADACHI SHINJI
    Division of Marine Biosciences, Graduate School of Fisheries Sciences
  • YAMAUCHI KOHEI
    Division of Marine Biosciences, Graduate School of Fisheries Sciences

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Abstract

The present study was designed to quantify changes in serum vitellogenin (VTG) levels and to localize VTG in hepatic cells immunohistochemically during artificial maturation of the Japanese eel Anguilla japonica. Hormone treatment resulted in a gradual rise in serum VTG levels, in which the highest values were attained at the migratory nucleus stage. Hepatocytes responded to hormone treatment by increased immunoreactivity; both staining area and intensity were enhanced with ongoing gonadal development. Moreover, cytoplasmic vacuoles increased in number during artificial maturation, occupying large areas inside hepatocytes. The unusual appearance of hepatocytes may reflect the effect of artificial maturation.

Journal

  • Fisheries science

    Fisheries science 67 (5), 880-887, 2001

    The Japanese Society of Fisheries Science

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