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ECB-ART-37171
Proc Natl Acad Sci U S A 1999 Apr 27;969:5019-24. doi: 10.1073/pnas.96.9.5019.
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Calcium influx is required for endocytotic membrane retrieval.

Vogel SS , Smith RM , Baibakov B , Ikebuchi Y , Lambert NA .


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Cells use endocytotic membrane retrieval to compensate for excess surface membrane after exocytosis. Retrieval is thought to be calcium-dependent, but the source of this calcium is not known. We found that, in sea urchin eggs, endocytotic membrane retrieval required extracellular calcium. Inhibitors of P-type calcium channels-cadmium, omega-conotoxin MVIIC, omega-agatoxin IVA, and omega-agatoxin TK-blocked membrane retrieval; selective inhibitors of N-type and L-type channels did not. Treatment with calcium ionophores overcame agatoxin inhibition in a calcium-dependent manner. Cadmium blocked membrane retrieval when applied during the first 5 minutes after fertilization, the period when the membrane potential is depolarized. We conclude that calcium influx through omega-agatoxin-sensitive channels plays a key role in signaling for endocytotic membrane retrieval.

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Genes referenced: LOC100887844

References [+] :
Angleson, Monitoring secretion in real time: capacitance, amperometry and fluorescence compared. 1997, Pubmed