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O. RESNICK, Ph.D.; H. FREEMAN, M.D.

Arch Gen Psychiatry. 1962;6(5):388-394.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

When epinephrine (E) labeled with carbon-14 in the N-methyl group of the side-chain is infused, the radioactivity excreted in the urine represents free and conjugated epinephrine and free and conjugated metanephrine (MN).^1-3 Thus, the cumulative per cent of infused radioactivity excreted in the urine represents phenolic amines. These phenolic amines consist of epinephrine and those metabolites of epinephrine which retain the N-methyl group of the side-chain. Those metabolites of the infused epinephrine which have lost the N-methyl-C¹⁴ group of the side-chain, via the action of the monoamine oxidase enzyme system (MAO), and excreted in the urine are no longer radioactive. These metabolites represent the phenolic acids and glycols; e.g., 3-methoxy-4-hydroxymandelic acid (VMA), 3,4-dihydroxymandelic acid (DMA), 3-methoxy-4-hydroxyphenylglycol, etc.

Epinephrine has been shown not to pass through the blood-brain barrier to any appreciable extent in laboratory animals.⁴ If this is true also for man, . . . [Full Text PDF of this Article]

Author Affiliations
SHREWSBURY, MASS.

Worcester Foundation for Experimental Biology, Shrewsbury, Mass., and Medfield State Hospital, Medfield, Mass.

Footnotes
Submitted for publication Nov. 23, 1961.

This investigation was aided by a grant from the U.S. Public Health Service, MY-2936.

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