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• W2158094955 abstract "Abstract A transient Ca2+ release from preloaded mitochondria can be induced by a sudden decrease in the pH of the outer medium from 8.0 or 7.4 to 6.8. In the presence of inorganic phosphate the released Ca2+ is not taken up again. Upon Ca2+ addition to respiring mitochondria the mitochondrial membrane potential (Δ♀) decreases to a new resting level. A further decrease in Δ♀ occurs after the decrease in pH from 7.4 to 6.8, concomitant with the reuptake phase of the Ca2+ release. Phosphate, EGTA, and ruthenium red restore Δ♀ to its initial level. If phosphate is present initially, only transient changes in Δ♀ occur upon addition of Ca2+ or H+ ions. Only a small transient change in Δ♀ upon H+ ion addition is seen in the absence of accumulated Ca2+. La3+, a competitive inhibitor of Ca2+ transport, prevents the H+ ion-induced Ca2+ efflux, whereas this is not the case in the presence of the noncompetitive inhibitor ruthenium red. Ruthenium red, however, prevents the reuptake phase. Mg2+, an inhibitor of the surface binding of Ca2+, has no or only a slight effect on the H+ ion-induced Ca2+ release. Mitochondria preloaded with Ca2+ release a small fraction of Ca2+ during the subsequent uptake of another pulse of Ca2+. The results indicate that at least one pool of mitochondrial Ca2+ exists in a mobile state. The possible existence of a H + Ca 2+ exchanger in the mitochondrial membrane is discussed." @default.
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• W2158094955 date "1978-08-01" @default.
• W2158094955 modified "2023-10-11" @default.
• W2158094955 title "Effect of pH and Ca2+ on the retention of Ca2+ by rat liver mitochondria" @default.
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• W2158094955 doi "https://doi.org/10.1016/0003-9861(78)90211-4" @default.
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