[Updated on Apr. 18] Integration of CiNii Articles into CiNii Research

Induction of oocyte-nurse cell differentiation in the ovary by the brain during the initial stage of oogenesis in the silkworm, Bombyx mori (Lepidoptera: Bombycidae)

  • ORIKASA C.
    Department of Anatomy and Embryology, Tokyo Metropolitan Institute for Neuroscience
  • YAMAUCHI Hideo
    Laboratory of Insect Physiology, Division of Forest Biology, Forestry and Forest Products Research Institute
  • NAGASAWA Hiromichi
    Laboratory of Molecular Biology of Marine Organisms, Ocean Research Institute, The University of Tokyo Department of Agricultural Chemistry, Faculty of Agriculture, The University of Tokyo
  • SUZUKI Akinori
    Department of Agricultural Chemistry, Faculty ofAgriculture, The University of Tokyo
  • NAGATA Masao
    Laboratory of Sericulture, Faculty of Agriculture, The University of Tokyo

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Abstract

Co-culture of ovarian cells in young larvae with brain induced meiosis and endomitosis of the silkworm, Bombyx mori. This suggests that a substance secreted by the brain controls meiosis and endomitosis. When preparations from Bombyx heads were tested for meiosis-inducing activity, both the crude and highly purified preparations of bombyxin induced meiosis in vitro, but the crude preparation of prothoracicotropic hormone (PTTH) showed much lower activity. This indicates that bombyxin is the brain substance that induces meiosis. 20-Hydroxyecdysone also induced meiosis, but only at a low concentration.

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