The purification and properties of aldose reductase from rat ovary

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Abstract

Aldose reductase has been highly purified from rat ovary to apparent homogeneity, as assessed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The purified enzyme proved to be a monomeric protein with a molecular weight of about 39,900. The enzyme catalyzed the NADPH-dependent reduction of a number of aromatic and aliphatic aldehydes as well as aldosugars. The enzyme was potently inhibited by p-chloromercuribenzoate and a commercially developed aldose reductase inhibitor, M79175. The result of an immunoinhibition study, using antibody against the purified enzyme, indicated that the enzyme was responsible for more than 50% of the overall catalytic activity of d-glucose reduction in rat ovarian cytosol. Western blotting analysis revealed that immunoreactive proteins to antiovarian aldose reductase antibody were present in adrenal gland, various reproductive tissues, brain, lung, and heart of rats. Furthermore, ovarian tissues of various species contained immunoreactive proteins, though in small amounts. The enzyme was primarily localized in the granulosa cells and oocytes of all stages of follicular development during the estrous cycle, though it was also found in the corpora lutea cells in the pregnant rats.

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    Present address: Division of Xenobiotic Metabolism and Disposition, National Institute of Hygienic Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158.

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