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1 Laboratory of Chemical Pharmacology, National Heart Institute, National Institutes of Health, Bethesda, Maryland
Probenecid, a drug that competitively inhibits the renal tubular secretion of a number of acidic substances, also blocks the efflux of 5-hy-droxyindoleacetic acid (5-HIAA) from rat brain. The rate at which 5-HIAA is accumulated after probenecid administration almost exactly equals the rate of formation of this acid from serotonin (5-HT). These results imply that 5-HIAA and perhaps other acidic products of brain metabolism are transferred directly from brain to plasma by a specialized process.
Submitted on March 27, 1967
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