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. 1988 Sep 15;254(3):715–721. doi: 10.1042/bj2540715

Electrophoretic and immunochemical characterization of 3 alpha-hydroxysteroid/dihydrodiol dehydrogenases of rat tissues.

T E Smithgall 1, T M Penning 1
PMCID: PMC1135143  PMID: 3196287

Abstract

The properties of 3 alpha-hydroxysteroid/dihydrodiol dehydrogenase from Sprague-Dawley rat liver cytosol have been re-examined in light of several reports which suggest that multiple forms of the enzyme may exist in this tissue. During enzyme purification, chromatography on DE-52 cellulose and chromatofocusing columns indicated the existence of only one form of the protein. Re-chromatography of the purified enzyme by either of these techniques failed to resolve the protein into additional forms. When the purified enzyme was subjected to SDS/polyacrylamide-gel electrophoresis a single band corresponding to Mr 34,000 was detected. Two-dimensional gels showed one predominant protein with a pI of 5.9. Using the homogeneous enzyme as antigen, high-titre polyclonal antibody was raised in rabbits. Western-blot analysis of cytosolic proteins prepared from male and female Sprague-Dawley rat liver indicated the presence of a single immunoreactive band with an Mr of 34,000 in both sexes. All of the 3 alpha-hydroxysteroid dehydrogenase activity present in rat liver cytosol could be immunotitrated with the antibody and the resulting titration curve was superimposable on the titration curve obtained with the purified enzyme. Western-blot analysis of cytosolic proteins prepared from livers of male Wistar and Fischer rats also revealed the presence of a single immunoreactive protein with an Mr of 34,000. These data indicate that, contrary to previous reports, only one form of the dehydrogenase may exist in liver cytosols prepared from a variety of rat strains. Although 3 alpha-hydroxysteroid dehydrogenase activity is known to be widely distributed in male Sprague-Dawley rat tissues, Western blots indicate that only the liver, lung, testis and small intestine contain immunoreactive protein with an Mr of 34,000. The levels of immunoreactive protein in these tissues follow the distribution of dihydrodiol dehydrogenase.

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Selected References

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