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A fatty acid synthase blockade induces tumor cell-cycle arrest by down-regulating Skp2

Lynn M Knowles1, Fumiko Axelrod, Cecille D Browne

  • 1Cancer Research Center, The Burnham Institute, La Jolla, California 92037, USA.

The Journal of Biological Chemistry
|May 13, 2004
PubMed

Insights

Inhibition of fatty acid synthase (FAS) in cancer cells reduces tumor proliferation by down-regulating Skp2 and impacting cell-cycle regulators. This reveals new links between FAS and cancer progression.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Fatty acid synthase (FAS) synthesizes palmitate, crucial for nonessential fatty acids.
  • Elevated FAS levels are observed in various cancers, marking it as a potential drug target.

Purpose of the Study:

  • To investigate the effects of inhibiting fatty acid synthase (FAS) on tumor cell proliferation.
  • To explore the molecular mechanisms linking FAS activity to cancer cell cycle regulation.

Main Methods:

  • Utilized Orlistat, an FDA-approved drug, to inhibit FAS thioesterase activity.
  • Employed small interfering RNA (siRNA) for targeted suppression of FAS gene expression.
  • Analyzed the impact of FAS ablation on Skp2, p27Kip1, and the retinoblastoma protein pathway.

Main Results:

  • Both Orlistat treatment and siRNA-mediated FAS knockdown led to significant downregulation of Skp2.
  • Reduced Skp2 levels resulted in altered turnover of p27Kip1, a key cell-cycle regulator.
  • These molecular changes culminated in cell-cycle arrest at the G1/S phase boundary.

Conclusions:

  • Fatty acid synthase (FAS) plays a critical role in regulating cell-cycle proteins through ubiquitin-dependent proteolysis.
  • Targeting FAS may offer a novel therapeutic strategy for cancer by disrupting cell proliferation pathways.
  • The study uncovers previously unrecognized connections between fatty acid metabolism and cancer cell-cycle control.

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