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N G ,N G-Dimethyl-l-arginine, a dominant precursor of endogenous dimethylamine in rats

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Summary

The metabolic significance ofN G ,N G-dimethyl-l-arginine (DMA) as a precursor of endogenous dimethylamine (DMN) in rats was examined in connection with the wide distribution and active operation of dimethylargininase (EC3.5.3.18) in rat tissues (Kimoto et al., 1993). When [methyl-14C]DMA was administered intraperitoneally to rats, the radioactive DMN was detected in various tissues as a major radioactive metabolite one hour after injection, and about 65% of the radioactivity administered was recovered in the first 12-h urine as DMN. In the case of the [14C] DMN-injected rats, almost all the radioactivity was excreted in the 12-h urine as DMN, except for a negligible amount of radioactivity found in urea. The time-dependent decrease in the specific radioactivity of DMA and DMN in urine showed that dimethylargininase was significantly involved in thein vivo formation of DMN by the hydrolytic cleavage of DMA released from methylated proteins and that DMA is a dominant precursor of endogenous DMN in rats.

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Authors and Affiliations

  1. Department of Nutrition, School of Medicine, The University of Tokushima, Kuramoto-cho, 770, Tokushima, Japan

    M. Kimoto, H. Tsuji & T. Ogawa

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  1. M. Kimoto
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  2. H. Tsuji
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  3. T. Ogawa
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Kimoto, M., Tsuji, H. & Ogawa, T. N G ,N G-Dimethyl-l-arginine, a dominant precursor of endogenous dimethylamine in rats. Amino Acids 6, 273–282 (1994). https://doi.org/10.1007/BF00813747

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  • DOI: https://doi.org/10.1007/BF00813747

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