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Saturated Fatty Acids Induce Ceramide-associated Macrophage Cell Death
08:26

Saturated Fatty Acids Induce Ceramide-associated Macrophage Cell Death

Published on: October 31, 2017

Fatty acid protection from palmitic acid-induced apoptosis is lost following PI3-kinase inhibition

N Beeharry1, J A Chambers, I C Green

  • 1School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton, BN2 4GJ East Sussex, UK. n.beeharry@brighton.ac.uk

Apoptosis : an International Journal on Programmed Cell Death
|August 18, 2004
PubMed

Insights

Saturated fatty acids like palmitate induce cell death in beta-cells. However, the polyunsaturated fatty acid linoleic acid protects against this damage, particularly apoptosis, via phosphatidylinositol 3-kinase signaling.

Area of Science:

  • Cell Biology
  • Metabolism
  • Endocrinology

Background:

  • Saturated fatty acids (SFAs) can induce DNA damage and apoptosis in pancreatic beta-cells.
  • Understanding the specific effects of different dietary fatty acids on beta-cell survival is crucial for metabolic health.

Purpose of the Study:

  • To investigate the differential effects of various dietary fatty acids on RINm5F cell survival and cell death pathways.
  • To determine if ceramide synthesis or nitric oxide generation pathways mediate palmitate-induced cell death.
  • To elucidate the role of phosphatidylinositol 3-kinase (PI3K) in mediating protective effects of linoleic acid.

Main Methods:

  • Exposure of RINm5F cells to individual or combined fatty acids (palmitate, stearate, linoleate, oleate).
  • Treatment with inhibitors of ceramide synthesis (myriocin, fumonisin B1), inducible nitric oxide synthase (1400 W), and PI3K (LY294002, wortmannin).
  • Assessment of cell viability, apoptosis, and necrosis.

Main Results:

  • Palmitate and stearate induced growth inhibition and apoptosis in RINm5F cells.
  • Linoleic acid, but not oleate or palmitoylmethyl ester, protected against palmitate-induced cell death (apoptosis and necrosis).
  • Inhibitors of ceramide synthesis and nitric oxide synthase did not prevent palmitate-induced cell death.
  • PI3K inhibitors abolished the protective effect of linoleic acid on apoptosis but not necrosis.

Conclusions:

  • The saturated fatty acid palmitate induces growth inhibition and apoptosis in RINm5F cells.
  • Linoleic acid prevents palmitate-induced cell death, suggesting a protective role for polyunsaturated fatty acids.
  • Phosphatidylinositol 3-kinase signaling is critical for the anti-apoptotic effect of linoleic acid against palmitate toxicity.

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