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• W2131980947 abstract "During early differentiation of Dictyostelium the attractant cAMP is released periodically to induce aggregation of the cells. Here we pursue the question whether pulsatile cAMP signaling is coupled to a basic Ca2+-oscillation.We found that the calmodulin antagonist W-7 transiently enhanced cAMP spikes. We show that W-7 acts on an acidic Ca2+-store: it abolished ATP-dependent vesicular acidification, inhibited V-type H+ATPase activity more potently than the weaker antagonist W-5 and caused vesicular Ca2+-leakage. Concanamycin A, an inhibitor of the V-type H+-pump, blocked the Ca2+-leakage elicited by W-7 as well as cAMP-oscillations in the presence of W-7. Concanamycin A caused an increase of the cytosolic Ca2+-concentration whereas W-7 did not. In case of the latter, Ca2+ was secreted by the cells. In accord with our hypothesis that the link from Ca2+ to cAMP synthesis is mediated by a Ca2+-dependent phospholipase C we found that W-7 was not active in the phospholipase C knockout mutant.We conclude that the potentiation of cAMP relay by W-7 is due to a transient inhibition of the acidic Ca2+-store. The inhibition of the proton pump by W-7 causes a leakage of Ca2+ that indirectly stimulates adenylyl cyclase activity via phospholipase C." @default.
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• W2131980947 date "2004-05-17" @default.
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• W2131980947 doi "https://doi.org/10.1186/1471-213x-4-7" @default.
• W2131980947 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/419698" @default.
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