The cAMP-dependent protein kinase (ATP:protein phosphotransferase, EC 2.7.1.37), has been studied in the vaginal epithelium, vaginal stroma, endometrium, and whole uterus of spayed mice treated with oestradiol-17β, and in the vaginal epithelium and uterus of spayed mice. Two protein kinase isoenzymes (PK I and PK II) were found in whole uterus, endometrium, and vaginal stroma. Vaginal epithelium contained only one isoenzyme (PK II). Oestradiol treatment increased PK I relative to PK II in the uterus. The isoenzyme pattern in the vaginal epithelium was unaltered after such treatment. The total protein kinase activity was 70% higher in uterine extracts (cytosol) than in extracts from vaginal epithelium. Oestradiol treatment did not influence the total protein kinase activity in either tissue.
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