Abstract
ATPase activity of coupled Zajdela hepatoma mitochondria was rendered uncoupler-sensitive by decreasing free fatty acids content in mitochondria or by preincubation of mitochondria with ATP prior to the addition of an uncoupler. The latter treatment resulted in an accelerated transport of ATP into the organelles. The effect of carbonylcyanide-m-chlorophenylhydrazone and oligomycin on the decrease of the ATP content in whole Zajdela hepatoma cells indicated that the hepatoma mitochondrial ATPase is stimulated by uncouplers in vivo . The conclusion is that the uncoupler-insensitive ATPase activity of coupled Zajdela hepatoma mitochondria is exhibited only by isolated organelles and results from a reduced ATP ADP translocase activity.
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