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[Membrane-bound Ca2+ in the mitochondria of Ehrlich ascitic tumor cells].

Ca2+ transport in mitochondria of Ehrlich ascite tumour cells and in liver mitochondria has been compared. It has been shown that in tumour cell mitochondria unlike liver ones even small amounts of Ca2+ caused marked increase in membrane-bound Ca2+ level. Therefore, a decrease in the electro-neutral Ca2+ efflux, stabilization of mitochondria membranes and inhibition of phosphorylated respiration were observed. It has been proposed that high content of membrane-bound Ca2+ is predetermined by a higher affinity of membrane phospholipids to Ca2+.