[No authors listed]
Small proline-rich protein 2a (Sprr2a) is one of the structural components of the cornified keratinocyte cell envelope that contributes to form a protective barrier in the skin against dehydration and environmental stress. Interestingly, Sprr2a mRNA is detected in the mouse uterus and is regulated by 17β-oestradiol (E2). In the present study, we investigated the effects of E2 and oestrogenic compounds on the regulation and localisation of Sprr2a protein in the mouse uterus. Immunohistochemical staining revealed that Sprr2a protein is detected only in the adult uterus, and not in the ovary, oviduct or testis. We also demonstrated that Sprr2a protein is tightly regulated by E2 in the mouse uterus and exclusively detected in luminal and glandular epithelial cells. Furthermore, Sprr2a is dose-dependently induced by oestrogenic compounds such as bisphenol A and 4-tert-octylphenol. Collectively, our studies suggest that Sprr2a protein may have a unique function in physiological events in the mouse uterus and can be used as an indicator to detect compounds with oestrogenic activity in the mouse uterus.
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