Induction of Larval Metamorphosis in Serpulid Polychaetes by L-DOPA and Catecholamines

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  • Okamoto Ken
    Fisheries Laboratory, University of Tokyo
  • Watanabe Akihiko
    Department of Applied Biological Chemistry, Shizuoka Univeristy
  • Watanabe Naoharu
    Department of Applied Biological Chemistry, Shizuoka Univeristy
  • Sakata Kanzo
    Research Laboratory of Marine Biological Science, Faculty of Agriculture, Shizuoka University

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タイトル別名
  • Induction of Larval Metamorphosis in Se

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Eight neuroactive molecules were examined for their larval metamorphosis-inducing activities in three species of serpulid polychaetes, Hydro ides ezoensis, Pomatoleios kraussii, and Ficopomatus enigmaticus. L-3, 4-dihydroxyphenylalanine (L-DOPA) and D-DOPA induced larval metamorphosis in all species, while dopamine did not. Epinephrine and norepinephrine also inducedlarval metamorphosis in H. ezoensis and P. kraussii. Approximately 58-67% of H. ezoensis larvae metamorphosed when exposed to L-DOPA at concentrations of 3×10-6-1×10-5 M, while D-DOPA induced 43-44% metamorphosis at 2×10-5-3×10-5 M. Dose-dependent induction by L-DOPA and lowactivity of the enantiomer suggest the possibility of receptor mediation in metamorphosis induction by L-DOPA. Because of the delayed reaction and the absence of tube formation, L-DOPA is thought to act not on epithelial chemoreceptors but to affect other pathways of metamorphosis. Competence for metamorphosis in H. ezoensis by L-DOPA fluctuated with larval age and two peaks were observed on the 5-6 th and 9-11 th days after fertilization.

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