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Fatty acid availability controls autophagy and associated cell functions.

Leslie A Rowland1, Michael P Czech

  • 1Program in Molecular Medicine, University of Massachusetts Chan Medical School, Worcester, MA, USA.

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The de novo lipogenesis pathway supplies fatty acids for autophagic membrane synthesis in adipocytes. Blocking autophagy due to fatty acid loss triggers thermogenesis, highlighting autophagy's role in cell behavior.

Keywords:
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Area of Science:

  • Cell Biology
  • Metabolism
  • Autophagy Research

Background:

  • Macroautophagy/autophagy requires significant membrane expansion, involving autophagic vesicles and lysosomes.
  • The precise origin of membrane lipids for this process remains largely uncharacterized.

Purpose of the Study:

  • To investigate the source of fatty acids utilized for autophagic membrane synthesis in adipocytes.
  • To determine the role of de novo lipogenesis in supplying lipids for autophagy.

Main Methods:

  • Utilized adipocytes for *in vitro* and *in vivo* studies.
  • Investigated the effects of fatty acid synthase (FASN) loss on autophagic flux and lysosome function.
  • Examined the impact of autophagy blockade on adipocyte thermogenic phenotype.

Main Results:

  • Identified the de novo lipogenesis pathway as the preferred source of fatty acids for autophagic membrane synthesis.
  • Demonstrated that loss of fatty acid synthase (FASN) impairs autophagic flux and lysosome function.
  • Observed that impaired autophagy due to fatty acid deficiency induces a thermogenic phenotype in adipocytes.

Conclusions:

  • De novo fatty acid synthesis channels lipids for autophagic membrane expansion, distinct from lipoprotein-derived fatty acids used for storage.
  • Autophagy plays a crucial role in regulating adipocyte behavior, as evidenced by the thermogenic response upon autophagy blockade.