Hormonal regulation of pheromone biosynthesis in the silkworm moth, Bombyx mori (Lepidoptera: Bombycidae)

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  • ARIMA R
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • TAKAHARA Kasumi
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • KADOSHIMA Tomoko
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • NUMAZAKI Fusako
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • AND0 Tetsu
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • UCHIYAMA Masaaki
    Department of Applied Biological Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • NAGASAWA Hiromichi
    Department of Agricultural Chemistry, Faculty of Agriculture, The University of Tokyo
  • KITAMURA Akihiro
    Department of Agricultural Chemistry, Faculty of Agriculture, The University of Tokyo
  • SUZUKI Akinori
    Department of Agricultural Chemistry, Faculty of Agriculture, The University of Tokyo

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In the silkworm moth (Bombyx mori L.), the sex pheromone [bombykol, (10E, 12Z)-10, 12-hexadecadien-1-ol] became undetectable 24 hr after decapitation, but its production was restored by the injection of a brain hormone (pheromone biosynthesis activating neuropeptide, PBAN). In order to understand the mode of action of this hormone, ^<14>C-incorporation into pheromone precursors and related compounds was examined by treating the pheromone glands of normal, decapitated, and decapitated and hormone-injected virgin females with ^<14>C-hexadecanoic acid. In the decapitated female moth, conversion of the ^<14>C-acid into bombykol as well as other C_<16>-fatty alcohols was very low. The levels of ^<14>C-incorporation observed in normal females were partially recovered in the decapitated female by hormone injection. However, the amount of unsaturated C_<16>-fatty acyl moieties and their levels of ^<14>C-incorporation was not decreased as much by decapitation. This suggest that the main regulatory role of PBAN is in the reduction of an acyl moiety in the bombykol biosynthetic pathway rather than effecting unsaturation steps. Further, when the gland, which was removed from the decapitated female, was incubated in a Grace's medium with PBAN, the pheromone was again produced indicating the direct regulation of the pheromone gland by this hormone.

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