Specific Regulation by Steroid Hormones of Protein Kinases in the Endometrium. 1. Alteration by Estrogen and Progesterone in Levels of Protein Kinases in Rabbit Endometrium

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Abstract
The alteration in activities of multiple protein kinases has been studied in the endometrium of a rabbit treated with estrogen and progesterone. The administration of estrogen or progesterone to the castrated rabbit resulted in a remarkable increase of total activity in the cytosol fraction of the endometrium. The administration of estrogen caused an increase of type I adenosine‐3′,5′‐mono‐ phosphate‐dependent (cAMP‐dependent) protein kinase and a slight decrease of type II cAMP‐dependent protein kinase. In contrast, the treatment with progesterone after priming administration of estrogen brought about an increase of type II cAMP‐dependent protein kinase and a decrease of type I cAMP‐dependent protein kinase. Therefore, the activity ratio of type II to type I decreased by estrogen and increased by progesterone. The simultaneous administration of cycloheximide abolished the stimulatory effect of respective hormones on the level of each protein kinase. The activity profile of protein kinases on DEAE‐cellulose column after ovulation caused by the administration of human chorionic gonadotropin to a non‐castrated rabbit was similar to that of the rabbit treated with progesterone. The results presented demonstrate the specific regulation by the steroid hormones of de novo synthesis of protein kinases in the target organ.

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