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Glycoproteins of mouse vaginal epithelium: differential expression related to estrous cyclicity

B Horvat, HA Multhaupt and I Damjanov

Department of Pathology and Cell Biology, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pa 19107.

We used lectin overlay blotting and SDS-PAGE to analyze the estrous cycle-specific expression of mouse vaginal epithelial glycoproteins. Seven lectins chosen for their differential carbohydrate-binding specificity revealed 15 glycoproteins that showed cycle-related expression. Each lectin had a unique binding pattern different from the patterns revealed by other lectins. However, several estrous cycle phase-specific glycoproteins reacted with more than one lectin. The most prominent of these glycoproteins (M(r) 92-95 KD) was weakly expressed in late diestrus and fully expressed only in proestrus, coincident with the transformation of two superficial layers of vaginal squamous epithelium into mucinous cuboidal cells. Electron microscopic lectin histochemistry revealed the glycoproteins in the mucinous granules of surface cuboidal cells and in the lumen of the vagina. Our results illustrate the complexity of glycoconjugate synthesis in mouse vagina and reveal the distinct cycle-specific patterns of individual glycoprotein expression. These cyclic glycoproteins could serve as vaginal biochemical markers for the specific phases of the estrous cycle.

Volume 41, Issue 9, pp. 1351-1357, 09/01/1993
Copyright © 1993 by The Histochemical Society


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