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[Catecholamine metabolism and mitochondrial enzyme activity]
Abstract:
Specific effects of various catecholamines as well as functional dependence of mitochondrial enzymes activity on catecholamine metabolism were studied. Dopamine activated cytochrome c oxidase in heart mitochondria and decreased this enzymatic activity in liver tissue. Noradrenaline and adrenaline activated cytochrome c oxidase in liver, brain and kidney tissues. The effect of dopamine on cytochrome c oxidase was prevented by activation of dopamine beta-hydroxylase. Increased activity of monoamine oxidase caused accumulation of catecholamine metabolites, which inhibited the succinate dehydrogenase activity in liver tissue and the cytochrome c oxidase activity in brain, kidney and liver tissues. In the catecholamine regulation of succinate dehydrogenase and ATPase activities in all the tissues studied as well as of cytochrome c oxidase activity in heart tissue the quinoid oxidation products were apparently involved.
Insights
Catecholamines like dopamine, noradrenaline, and adrenaline impact mitochondrial enzyme activity differently across tissues. Their metabolites can inhibit key enzymes, suggesting quinoid products are involved in regulation.
Area of Science:
- Biochemistry
- Cellular Biology
- Neuroscience