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. 1972 Jul;51(7):1798–1804. doi: 10.1172/JCI106981

Tyrosine hydroxylase in human adrenal and pheochromocytoma: localization, kinetics, and catecholamine inhibition

J C Waymire 1,2, N Weiner 1,2, F H Schneider 1,2, M Goldstein 1,2, L S Freedman 1,2
PMCID: PMC292327  PMID: 4402349

Abstract

The properties of partially purified tyrosine hydroxylase from six pheochromocytomas were compared with partially purified normal human and bovine adrenal medulla enzyme. Substrate and inhibition kinetics, cofactor requirements, and intracellular localization of the enzyme from normal and tumor chromaffin tissue of humans were similar, as was the amount of enzyme activity per gram of tissue. Contrary to previous reports, the sensitivity to catecholamine inhibition of the pheochromocytoma enzyme from the six tumors studied was similar to that of both human and bovine adrenal medulla tyrosine hydroxylase. These results suggest that the excessive synthesis and secretion of catecholamines in some pheochromocytomas is not the result of a reduced sensitivity of tyrosine hydroxylase to catecholamine inhibition.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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