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Vol. 9, Issue 8, 2259-2267, August 1998

Cysteine String Protein Functions Directly in Regulated Exocytosis

Luke H. Chamberlain, and Robert D. Burgoyne*

The Physiological Laboratory, Liverpool University, Liverpool L69 3BX, United Kingdom

Cysteine string protein (Csp) is essential for neurotransmitter release in Drosophila. It has been suggested that Csp functions by regulating the activity of presynaptic Ca2+ channels, thus controlling exocytosis. We have examined the effect of overexpressing Csp1 in PC12 cells, a neuroendocrine cell line. PC12 cell clones overexpressing Csp1 did not show any changes in morphology, granule number or distribution, or in the levels of other key exocytotic proteins. This overexpression did not affect intracellular Ca2+ signals after depolarization, suggesting that Csp1 has no gross effect on Ca2+ channel activity in PC12 cells. In contrast, we show that Csp1 overexpression enhances the extent of exocytosis from permeabilized cells in response to Ca2+ or GTPgamma S in the absence of Ca2+. Because secretion from permeabilized cells is not influenced by Ca2+ channel activity, this represents the first demonstration that Csp has a direct role in regulated exocytosis.

Molecular Biology of the Cell
Vol. 9, 2259-2267, August 1998
Copyright © 1998 by The American Society for Cell Biology


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