Effects of 6-hydroxydopamine on the activity of tyrosine hydroxylase and dopamine- -hydroxylase in sympathetic ganglia of the rat.

S. Brimijoin,P. Molinoff

Published 1971 in Journal of Pharmacology and Experimental Therapeutics

ABSTRACT

Administration of 6-OH-dopamine daily for two days causes a nearly complete depletion of endogenous norepinephrine and a persistent, although not total, loss of activity of dopamine-β-hydroxylase from the heart. In adrenal glands, 6-OH-dopamine administration increases the activity both of tyrosine hydroxylase and dopainine-β-hydroxylase without affecting catecholamine levels. In both normally innervated and decentralized sympathetic ganglia, administration of 6-OH-dopamine causes no change in tyrosine hydroxylase activity and a long-lasting 50% decrease in dopamine-β-hydroxylase activity. Pretreatment with 6-OH-dopamine prevents reserpine-induced. increases in the activity of these enzymes in ganglia. A similar effect is also produced by surgical section of the postganglionic axons of the superior cervical ganglion.

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