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Catecholamines induce metamorphosis in the hydrozoan Halocordyle disticha but not in Hydractinia echinata
Authors:Nancy Claire Edwards  Mary Beth Thomas  Bert Alan Long  Sherry Jo Amyotte
Affiliation:(1) Department of Biology, The University of North Carolina at Charlotte, 28223 Charlotte, NC, USA
Abstract:Summary Planula larvae of the marine hydroids Halocordyle disticha and Hydractinia echinata were treated with the catecholamines epinephrine, norepinephrine and dopamine, as well as with certain of their precursors and agonists. Norepinephrine, l-dopa, dopamine and the dopamine agonist ADTN at concentrations ranging from 0.1 to 0.001 mM induced metamorphosis within 24 h in Halocordyle disticha, with no observable morphogenetic abnormalities. Epinephrine, the adrenergic agonists phenylephrine, isoproterenol and methoxyamine, and the catecholamine precursors phenylalanine and tyrosine were found not to induce metamorphosis at the concentrations employed. None of the compounds was effective in inducing metamorphosis in Hydractinia echinata. A model is presented for neural control of metamorphosis in Halocordyle disticha
Keywords:Metamorphosis  Catecholamines  Development  Neurotransmitters  Hydrozoa
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