Journal
ZYGOTE
Volume 21, Issue 1, Pages 1-9Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0967199411000207
Keywords
Calmodulin; cAMP; Signalling pathways; Vitellogenesis; Xenopus laevis
Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT)
- Consejo de Investigaciones de la Universidad Nacional de Tucuman (CIUNT)
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The aim of the present study was to show the participation and physiological role of calmodulin (CaM) and cAMP during vitellogenin endocytic uptake in the amphibian Xenopus laevis. The results showed a differential distribution of CaM in the ovary follicles during oogenesis. The CaM intracellular localization was not affected by gap junction's downregulation and CaM inhibition did not completely abolished the endocytic activity of oocytes. We showed that cAMP was able to completely rescue the endocytic competence in follicles in which gap junctional communication had been disrupted by octanol. Moreover cAMP was capable of restoring oocyte endocytic capability in the presence of octanol and stelazine, a CaM inhibitor. We propose that, in Vtg uptake regulation, cAMP is upstream of CaM during the endocytic signalling pathway.
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