Lowering Extracellular pH Evokes Inositol Polyphosphate Formation and Calcium Mobilization
نویسندگان
چکیده
منابع مشابه
Decreasing extracellular Na+ concentration triggers inositol polyphosphate production and Ca2+ mobilization.
Removing extracellular Na+ (Na+o) evoked a large increase in cytosolic free Ca2+ concentration ([Ca2+]i in human skin fibroblasts. Decreasing [Na+]o from 120 to 14 mM caused the half-maximal peak increase in [Ca2+]i. Removing Na+o strongly stimulated 45Ca2+ efflux and decreased total cell Ca2+ by about 40%. Bradykinin caused changes in [Ca2+]i, total Ca2+, and 45Ca2+ fluxes similar to those evo...
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Phosphatidylinositol polyphosphates (PI-PPs) have been shown to mediate a large variety of physiological processes by attracting proteins to specific cellular sites. Such site-specific signaling requires local accumulation of PI-PPs, and in light of the rich headgroup functionality, it is conceivable that hydrogen bond formation between adjacent headgroups is a contributing factor to the format...
متن کاملProperties of inositol polyphosphate 1-phosphatase.
We recently described inositol polyphosphate 1-phosphatase, an enzyme which cleaves the 1-phosphate from inositol 1,4-bisphosphate (Ins(1,4)P2) and inositol 1,3,4-trisphosphate (Ins(1,3,4)P3) (Inhorn, R. C., and Majerus, P. W. (1987) J. Biol. Chem. 262, 15946-15952). We have now purified the enzyme to homogeneity from calf brain. The enzyme hydrolyzes 50.3 mumol of Ins(1,4)P2/min/mg protein. Th...
متن کاملLowering of the extracellular Na+ concentration enhances high-K+-induced formation of inositol phosphates in the guinea-pig ileum.
1. Formation of inositol phosphates (InsPs) was measured in cross-chopped slices or dispersed cells, isolated by collagenase treatment, of guinea-pig ileum longitudinal smooth muscle pre-labelled with [3H]inositol. 2. Elevation of the extracellular K+ concentration by equimolar replacement of Na+ induced accumulation of InsPs in the dispersed cells and in the tissue slices. These effects were b...
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Effects of extracellular acidification on intracellular pH (pHi) and ATP-induced calcium mobilization were investigated in rabbit lens epithelial cells. Primary-cultured lens epithelial cells of Japanese white rabbits were used. Intracellular calcium ([Ca]i) and pHi were measured by using fluorescent dyes, fura-2 acetoxymethylester (fura-2 AM) and 2',7'-bis (carboxyethyl)-5,6-carboxyfluorescein...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1989
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)81853-1