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Effets de divers agents (ionophores du Ca++ et du K+, organomercuriels, dithiols, colchicine et cytochalasine B) sur la différenciation sans clivage chez l'oeuf de chétoptère

par Brachet, Jean ;Denis-Donini, S
Référence Comptes rendus de l'Académie des sciences, 284, 12, page (1091-1096)
Publication Publié, 1977-03

Article révisé par les pairs

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Résumé :

Induction of maturation in Chaetopterus oocytes requires the presence of Ca++ ions in the medium, but differentiation without cleavage can proceed in the absence of this cation. The Ca++ ionophore A 23187 induces both maturation and the cortical reaction provided that Ca++ ions are present in the medium differentiation without cleavage may follow. Valinomycin slowly induces germinal vesicle breakdown, which is followed by a sharp segregation between hyaloplasm and yolk. PHMPS, but not DTT, induces maturation. Differentiation without cleavage is more sensitive to colchicin than to cytochalasin B.