Subcellular localization of steroid hormone metabolism in rat liver

Hans Glaumann, Jan-Ake Gustafsson

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The metabolism of 4-[4-14C]androstene-3,17-dione was studied in smooth- and rough-surfaced microsomes, plasma membranes, mitochondria, Golgi apparatus, and lysosomes isolated from rat liver. 5α-Reductase, 17β-hydroxysteroid reductase, 16α-, 6β-, and 7α-hydroxylase activities were measurable in all isolated subcellular fractions except in lysosomes which did not metabolize 4-androstene-3,17-dione. Steroid metabolism patterns in smooth and rough microsomes were very similar. The extent of microsomal contamination in the plasma membrane, Golgi apparatus, and mitochondrial and lysosomal fractions was measured both by ultrastructural (morphometric) analysis and by distribution analysis of "marker enzymes" and was less than 15, 3, 16, and 3%, respectively. Whereas it could not be excluded that the metabolisms of steroids in the Golgi apparatus enriched fraction occurred due to microsomal contamination, the data indicate that the steroid metabolism in isolated plasma membranes and mitochondria occurred due to the presence of steroid reducing and hydroxylating enzyme systems in these cell organelles. Indirectly, such a similarity in enzymatic makeup between different cell organelles would tend to support "the membrane flow hypothesis.".

Original languageEnglish (US)
Pages (from-to)221-234
Number of pages14
JournalExperimental and Molecular Pathology
Volume27
Issue number2
DOIs
StatePublished - Jan 1 1977

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Molecular Biology
  • Clinical Biochemistry

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