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

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Intracellular application of guanosine-5'-O-(3-thiotriphosphate) induces exocytotic granule fusion in guinea pig eosinophils.

The mechanism of eosinophil secretion was studied in guinea pig eosinophils by measuring release of hexosaminidase from cell suspensions (greater than 98% pure) permeabilized with streptolysin-O and by whole-cell patch-clamp capacitance measurements. It is shown that release of eosinophil granule components occurs by an exocytotic mechanism in which individual granules fuse with the plasma membrane. Exocytosis can be induced by intracellular application of the nonhydrolyzable GTP analog guanosine-5'-O-(3-thiotriphosphate) (GTP-gamma-S), suggesting the involvement of a GTP-binding protein. The activation is modulated by the intracellular calcium concentration, with activation by GTP-gamma-S inducing transient elevations in the concentration of Ca2+. Thus, the nature and regulation of the release mechanism appear to be very similar to that of the mast cell and neutrophil.[1]

References

  1. Intracellular application of guanosine-5'-O-(3-thiotriphosphate) induces exocytotic granule fusion in guinea pig eosinophils. Nüsse, O., Lindau, M., Cromwell, O., Kay, A.B., Gomperts, B.D. J. Exp. Med. (1990) [Pubmed]
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