Feminization of hepatic S metabolism in male rats with a transplanted (MtT/F4)

Peter Eneroth, Jan åke Gustafsson, Agne Larsson, Paul Skett, åke Stenberg, Carlos Sonnenschein

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


After transplantation of MIT/F4 pituitary tumor cells to male rats of the Fisher strain, the masculine type of hepatic steroid metabolism was changed into a feminine pattern of enzyme activities. Liver metabolism of steroid hormones in female rats was relatively unaffected following transplantation of pituitary tumor cells. Furthermore, extract from MIT/F4 tumors and "autonomous" pituitary tissue increased the 5α-reductase activity of hepatoma cells in the culture (HTC cells) at subsaturation concentrations of the substrate 4-androstene-3, 17-dione by decreasing the apparent Km of the enzyme. It is concluded that the pituitary tumor (in accord with the secretion from an "autonomous" pituitary gland) secretes "feminotropin," a novel hypophyseal principle that probably is an important regulator of hepatic steroid metabolism. It is suggested that pituitary tumor tissue of the MtT/F4 type could be used as source of feminotropin in purification studies.

Original languageEnglish (US)
Pages (from-to)413-417
Number of pages5
Issue number3
StatePublished - Mar 1976

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)


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