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- W1590430002 abstract "Uncouplers CCCP (2–4 μM) or DNP (200–400 μM) when added to EL-4 thymoma or Ehrlich carcinoma ascites cells initially stimulated endogenous respiration about 2-fold but then inhibited it to a first-order rate 20–25% of controls. This inhibition was accelerated by intracellular acidification or by A23187, a Ca2+/H+-antiporter (i.e. when mitochondrial Ca2+ efflux was stimulated) whereas Ruthenium red, an inhibitor of uniporter-driven Ca2+ efflux, significantly slowed down the effect of uncouplers. The respiratory inhibition was associated with NAD(P)H oxidation and was partially reversed by exogenous substrates (glutamine or glucose). In the permeabilized cells, endogenous and glutamine-supported respiration was inhibited by EGTA, while succinate-supported respiration was Ca2+ independent. It is suggested that mitochondrial Ca2+ is necessary for NADH-dependent respiration of tumor cells, and uncouplers inhibit it by activation of mitochondrial Ca2+ efflux." @default.
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- W1590430002 date "1993-08-23" @default.
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- W1590430002 title "Inhibition of uncoupled respiration in tumor cells" @default.
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- W1590430002 doi "https://doi.org/10.1016/0014-5793(93)80195-z" @default.
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