Add time:07/19/2019 Source:sciencedirect.com
Our experiments were designed to localize the inhibitory influence of bencyclane† on the process of oxidative phosphorylation in isolated heart and liver mitochondria. The following results were obtained: (1) The state-3-respiration of rat liver and rabbit heart mitochondria was inhibited by bencyclane. This inhibition was dependent on the substrate used as energy donator, being much more pronounced with glutamate (ed50 = 3.17 × 10−8or 1.85 × 10−7moles/mg of protein, respectively) than with succinate (ed50 = 3.4 × 10−7or 4.78 × 10−7moles/mg of protein, respectively). Since the 2,4-dinitrophenol stimulated respiration was equally inhibited, and glutamate transfer through the mitochondrial membrane not influenced, we assume the NADH-coenzyme-Q-reductase to be the site of interaction at the molecular level. (2) Bencyclane stimulates the state-4-respiration of isolated mitochondria with concentrations$̆= 10−5M. This effect depends on the molar bencyclane concentration of the incubation medium, and is not abolished by the addition of atractyloside, oligomycin or ruthenium red. Therefore, it is suggested that uncoupling of oxidative phosphorylation is the reason for this bencyclane effect. Theoretically, both of the described effects result in a reduction of the amount of ATP in the living cell. Possible consequences on myocardial function and the cardiovascular system are discussed in terms of previously published data in this field.
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