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Biochem Biophys Res Commun. 2005 Oct 14;336(1):309-15.

Oleate prevents palmitate-induced cytotoxic stress in cardiac myocytes.

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1
Molecular Stress Response Unit, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA 02118, USA.

Abstract

The cytotoxicity of saturated fatty acids has been implicated in the pathophysiology of cardiovascular disease, though their effects on cardiac myocytes are incompletely understood. We examined the effects of palmitate and the mono-unsaturated fatty acid oleate on neonatal rat ventricular myocyte cell biology. Palmitate (0.5mM) increased oxidative stress, as well as activation of the stress-associated protein kinases (SAPK) p38, Erk1/2, and JNK, following 18h and induced apoptosis in approximately 20% of cells after 24h. Neither antioxidants nor SAPK inhibitors prevented palmitate-induced apoptosis. Low concentrations of oleate (0.1mM) completely inhibited palmitate-induced oxidative stress, SAPK activation, and apoptosis. Increasing mitochondrial uptake of palmitate with l-carnitine decreased apoptosis, while decreasing uptake with the carnitine palmitoyl transferase-1 inhibitor perhexiline nearly doubled palmitate-induced apoptosis. These results support a model for palmitate-induced apoptosis, activation of SAPKs, and protein oxidative stress in myocytes that involves cytosolic accumulation of saturated fatty acids.

PMID:
16126172
DOI:
10.1016/j.bbrc.2005.08.088
[Indexed for MEDLINE]
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