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Summary. Round spermatids were isolated from rat testes and the effects of different energy-yielding substrates on the cellular ATP content were estimated. The ATP content was constant and high (6–8 nmol/106 cells) during metabolism of exogenous lactate. During incubation for 30 min in the absence of exogenous lactate, there was a remarkably slow decline of the ATP content, indicating ATP production from other substrates. It was shown that this could reflect β-oxidation of fatty acids, but not the mobilization of an endogenous pool of acetylcarnitine. Glucose metabolism in the absence of exogenous lactate resulted in a rapid decline of the ATP content. This effect of glucose was correlated with a high fructose 1,6-biphosphate content (6–7 nmol/106 cells) and could be prevented by the addition of lactate. It is suggested that metabolism of glucose (and also mannose and fructose, but not galactose) in the absence of exogenous lactate can result in ATP dephosphorylation.
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