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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Inositol hexakisphosphate promotes dynamin I- mediated endocytosis.

Membrane homeostasis is maintained by exocytosis and endocytosis. The molecular mechanisms regulating the interplay between these two processes are not clear. Inositol hexakisphosphate (InsP(6)) is under metabolic control and serves as a signal in the pancreatic beta cell stimulus-secretion coupling by increasing Ca(2+)-channel activity and insulin exocytosis. We now show that InsP(6) also promotes dynamin I-mediated endocytosis in the pancreatic beta cell. This effect of InsP(6) depends on calcineurin-induced dephosphorylation and is accounted for by both activation of protein kinase C and inhibition of the phosphoinositide phosphatase synaptojanin and thereby formation of phosphatidylinositol 4,5-bisphosphate. In regulating both exocytosis and endocytosis, InsP(6) thus may have an essential integral role in membrane trafficking.[1]

References

  1. Inositol hexakisphosphate promotes dynamin I- mediated endocytosis. Høy, M., Efanov, A.M., Bertorello, A.M., Zaitsev, S.V., Olsen, H.L., Bokvist, K., Leibiger, B., Leibiger, I.B., Zwiller, J., Berggren, P.O., Gromada, J. Proc. Natl. Acad. Sci. U.S.A. (2002) [Pubmed]
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