Coordination regulation of the biosynthesis of ATP-citrate lyase and malic enzyme during adipocyte differentiation. Studies on 3T3-L1 cells

L. S. Wise, H. S. Sul, C. S. Rubin

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

The biosynthesis and degradation of two lipogenic enzymes were studied during the differentiation of 3T3-L1 preadipocytes into adipocytes. The activity and mass of malic enzyme, rose by an order of magnitude during adipocyte development and the enzyme accounted for 0.3% of the cytosol protein in mature fat cells. Similarly, the activity and amount of ATP-citrate lyase increased approximately 7-fold during the adipose conversion. The relative rates of synthesis of the two enzymes were ≤0.02% in preadipocytes, but increased sharply as the cells began to differentiate. Maximal steady state rates of malic enzyme and ATP-citrate lyase synthesis in 3T3-L1 adipocytes were 13- and 8-fold higher, respectively, than the basal rates in preadipocytes. In contrast, the half-lives of malic enzyme (67 h) and ATP-citrate lyase (47 h) were not altered during adipocyte development. Thus, accelerated rates of enzyme synthesis account for the differentiation-dependent accumulation of the two lipogenic enzymes. Increased rates of malic enzyme, ATP-citrate lyase, and fatty acid synthetase biosynthesis are expressed in a highly coordinated manner during adipocyte differentiation and are associated with parallel elevations in the levels of translatable mRNAs for these enzymes.

Original languageEnglish (US)
Pages (from-to)4827-4832
Number of pages6
JournalJournal of Biological Chemistry
Volume259
Issue number8
StatePublished - Jan 1 1984

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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