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The influence of pituitary and gonadal hormones on serum levels of pregnancy-associated murine protein-1.

Hypophysectomy of female mice resulted in the disappearance of pregnancy-associated murine protein-1 (PAMP-1) from the circulation within a week. Maintenance of physiological levels of oestrogen, progesterone, testosterone, LH, FSH or prolactin was not sufficient to maintain a normal PAMP-1 level in the hypophysectomized animals. However, administration of oestrogen in large doses to adult male mice with undectatable levels of circulating PAMP-1 caused PAMP-1 to appear in the blood. Testosterone treatment of females inhibited the PAMP-1 synthesis.