Abstract
Germinal vesicle breakdown (GVBD) is the first visible response of the oocyte of Spisula solidissima to the neurohormone serotonin. Pharmacological characterization of this response was performed by using 24 serotonin-related compounds. Dose-response curves were assessed by quantification of GVBD. Rank orders of potency obtained were among agonists: serotonin > 8-hydroxy-2-(di- N-propylamino)tetralin hydrobromide > 2-methyl-serotonin > 1-(3-trifluoromethylphenyl)piperazine; among antagonists; ritanserin > ICS205930 > mianserin = ketanserin = propranolol > metoclopramide = yohimbine > spiperone. Various other monoaminergic compounds tested were inefficient, demonstrating the specificity of the oocyte response to serotonin. Transduction mechanisms underlying this response were then investigated. Ca 2+ appeared to be involved since serotonin induced an increase in the uptake of 45Ca 2+ and since it was inefficient in calcium-free sea water. The absence of synergy between serotonin and KCl suggested that both compounds use a common transduction pathway. Exposure of the oocyte to the protein kinase C activator TPA inhibited serotonin-dependent maturation. Our data thus point to an original, previously uncharacterized pharmacological profile and transduction mechanism by which serotonin induces oocyte meiosis reinitiation in Spisula solidissima
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