Biochemical Genetics

, Volume 23, Issue 7–8, pp 607–622 | Cite as

Dietary ethanol and lipid synthesis in Drosophila melanogaster

  • Billy W. Geer
  • Marilyn L. Langevin
  • Stephen W. McKechnie
Article

Abstract

When cultured on a defined diet, ethanol was an efficient substrate for lipid synthesis in wild-type Drosophila melanogaster larvae. At certain dietary levels both ethanol and sucrose could displace the other as a lipid substrate. In wild-type larvae more than 90% of the flux from ethanol to lipid was metabolized via the alcohol dehydrogenase (ADH) system. The ADH and aldehyde dehydrogenase activities of ADH were modulated in tandem by dietary ethanol, suggesting that ADH provided substrate for lipogenesis by degrading ethanol to acetaldehyde and then to acetic acid. The tissue activity of catalase was suppressed by dietary ethanol, implying that catalase was not a major factor in ethanol metabolism in larvae. The activities of lipogenic enzymes, sn-glycerol-3-phosphate dehydrogenase, fatty acid synthetase (FAS), and ADH, together with the triacylglycerol (TG) content of wild-type larvae increased in proportion to the dietary ethanol concentration to 4.5% (v/v). Dietary ethanol inhibited FAS and repressed the accumulation of TG in ADH-deficient larvae, suggesting that the levels of these factors may be subject to a complex feedback control.

Key words

ethanol alcohol dehydrogenase lipid Drosophilia carbohydrate nutrition 

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Copyright information

© Plenum Publishing Corporation 1985

Authors and Affiliations

  • Billy W. Geer
    • 1
  • Marilyn L. Langevin
    • 1
  • Stephen W. McKechnie
    • 2
  1. 1.Department of BiologyKnox CollegeGalesburg
  2. 2.Department of GeneticsMonash UniversityClaytonAustralia

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