Abstract
Lipid peroxidation in biological membranes is accompanied by malonic dialdehyde (MDA) formation, but the problem of its further metabolism in cytoplasm remains unsolved. The experimental data obtained in this work showed that the liver fraction prepared by centrifugation at 10,000g contained phosphoglucose isomerase and enzymes of the glyoxalase system. In this fraction in the presence of GSH there is an aggregate of reactions taking place both in membranes (lipid peroxidation) and outside membranes (MDA conversion to methylglyoxal and further to neutral D-lactate). This means that MDA is slowly accumulated because it is a substrate of aldehyde isomerase (MDA ↔ methylglyoxal). Most probably, phosphoglucose isomerase serves as this enzyme. We concluded that D-lactate should be regarded as the end product of two different parametabolic reactions: lipid peroxidation or protein glycation.
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Abbreviations
- MDA:
-
malonic dialdehyde
- MG:
-
methylglyoxal
- LPO:
-
lipid peroxidation
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Translated from Biokhimiya, Vol. 70, No. 11, 2005, pp. 1521–1526.
Original Russian Text Copyright © 2005 by Agadjanyan, Dmitriev, Dugin.
Originally published in Biochemistry (Moscow) On-Line Papers in Press, as Manuscript BM04-395, May 1, 2005.
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Agadjanyan, Z.S., Dmitriev, L.F. & Dugin, S.F. A New Role of Phosphoglucose Isomerase. Involvement of the Glycolytic Enzyme in Aldehyde Metabolism. Biochemistry (Moscow) 70, 1251–1255 (2005). https://doi.org/10.1007/s10541-005-0255-4
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DOI: https://doi.org/10.1007/s10541-005-0255-4