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. 1991 Jul;2(7):513–522. doi: 10.1091/mbc.2.7.513

Ca(2+)-induced Ca2+ release amplifies the Ca2+ response elicited by inositol trisphosphate in macrophages.

C Randriamampita 1, G Bismuth 1, A Trautmann 1
PMCID: PMC361841  PMID: 1782213

Abstract

We have studied the rise in intracellular calcium concentration ([Ca2+]i) elicited in macrophages stimulated by platelet-activating factor (PAF) by using fura-2 measurements in individual cells. The [Ca2+]i increase begins with a massive and rapid release of Ca2+ from intracellular stores. We have examined the mechanism of this Ca2+ release, which has been generally assumed to be triggered by inositol trisphosphate (IP3). First, we confirmed that IP3 plays an important role in the initiation of the PAF-induced [Ca2+]i rise. The arguments are 1) an increase in IP3 concentration is observed after PAF stimulation; 2) injection of IP3 mimics the response to PAF; and 3) after introduction of heparin in the cell with a patch-clamp electrode, the PAF response is abolished. Second, we investigated the possibility of an involvement of Ca(2+)-induced Ca2+ release (CICR) in the development of the Ca2+ response. Ionomycin was found to elicit a massive Ca2+ response that was inhibited by ruthenium red or octanol and potentiated by caffeine. The PAF response was also inhibited by ruthenium red or octanol and potentiated by caffeine, suggesting that CICR plays a physiological role in these cells. Because our results indicate that in this preparation IP3 production is not sensitive to [Ca2+]i, CICR appears as a primary mechanism of positive feedback in the Ca2+ response. Taken together, the results suggest that the response to PAF involves an IP3-induced [Ca2+]i rise followed by CICR.

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Selected References

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