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Free and conjugated 3-methoxy-4-hydroxyphenylglycol in human urine: Peripheral origin of glucuronide

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Abstract

The aim of our study was to investigate the endogenous origin of the three forms of 3-methoxy-4-hydroxyphenylglycol (MHPG) present in human urine and to further examine the hypothesis of an independent (peripheral or central) origin of glucuronide and sulfate conjugates. The urinary levels of free, sulfate, and glucuronide MHPG were determined in control subjects under normal conditions in relation to age, sex, and diet and in two experimental situations known to alter sympathetic activity. The mean daily excretion of total MHPG in a group of 14 men and 14 women was 1780±122 μg, with the free, sulfate, and the glucuronide representing 8%±0.5%, 40%±1.5%, and 52%±1.6%, respectively. No influence of sex, age, or diet was observed on any form. Strong physical activity and anticipatory stress increased norepinephrine excretion and selectively increased MHPG glucuronide levels without changing the free or the sulfate excretion. We conclude that the total amounts of free, sulfate, and glucuronide MHPG found in urine originate from endogenous body pools with no interference of dietary components. The sympathetic nervous system seems to be the main source of glucuronide and arguments are given supporting the central origin of sulfate.

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  1. ER CNRS 196, Laboratoire de Physiologie, Faculté de Médecine Grange-Blanche, F-69373, Lyon Cedex 2, France

    L. Peyrin & J. M. Pequignot

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  1. L. Peyrin
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  2. J. M. Pequignot
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Peyrin, L., Pequignot, J.M. Free and conjugated 3-methoxy-4-hydroxyphenylglycol in human urine: Peripheral origin of glucuronide. Psychopharmacology 79, 16–20 (1983). https://doi.org/10.1007/BF00433009

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  • DOI: https://doi.org/10.1007/BF00433009

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