Animal cells and systems

The Korean Society for Integrative Biology (한국통합생물학회)
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Regulatgion of the Transport of Vitellogenin by Heterotrimeric G-Proteins during Oogenesis of a Polychaete, Pseudopotamilla occelata

  • Published : 1998.03.01
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Abstract

Coelomoic fluid protein (CP), a vitellogenin contained in the coelomic fluid of polychaetes, is transported by receptor-mediated endocvtosis that is controlled by GTP-binding proteins. Transport of 125l-CP was markedly inhibited by AlF4 and toxins such as cholera toxin and pertussis toxin. These effects appear to be mediated by cAMP, since 125l-CP transport was also greatly inhibited by dibutyryl cAMP. The results strongly suggest that hetero trimeric G-protein is involved in the regulation of 125l=CP transport through the activation of adenylyl cyclase. Immunoblotting tests with antibodies against Gsa and Gia subunits showed a Gsa subunit of 45 kDa in the membrane of oocytes of intermediate and large size classes and a Gia subunit of 41 kDa only in the oocytes of the intermediate size class.

Keywords

References

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