Keratinization of rat vaginal epithelium IV. Modulation of transglutaminase activity by oestradiol

Abstract

Calcium-dependent transglutaminase activity was found to be present in vaginal homogenates from adult cycling rats. Treatment of immature or adult ovariectomized rats with oestradiol (0.1 μg/g body weight) resulted in 1.5–2-fold enhancement in the enzyme activity. Progesterone treatment (0.1 μg/g body weight) decreased the enzyme activity. Analysis of amino acids produced by proteolytic enzyme digestion of insoluble keratins from rat vaginal tissue indicated the presence of γ-glutamyl-ε-⥿sine dipeptide (4 μmol/g protein) in this protein. These results suggest that oestradiol acts on vaginal tissue and induces the activity of transglutaminase. This enzyme catalyses the formation of γ-glutamyl-ε-lysine crosslinks between keratin polypeptides and thus leads to kerartization of the tissue.

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Correspondence to P. D. Gupta.

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Vijayasaradhi, S., Gupta, P.D. Keratinization of rat vaginal epithelium IV. Modulation of transglutaminase activity by oestradiol. J. Biosci. 13, 401–408 (1988). https://doi.org/10.1007/BF02703451

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Keywords

  • Oestradiol
  • keratinization
  • transglutaminase