Abstract
BackgroundSeveral translational studies have identified the differential role between saturated and unsaturated fatty acids at cardiovascular level. However, the molecular mechanisms that support the protective role of oleate in cardiovascular cells are poorly known. For these reasons, we studied the protective role of oleate in the insulin resistance and in the atherosclerotic process at cellular level such as in cardiomyocytes (CMs), vascular smooth muscle cells (VSMCs) and endothelial cells (ECs).MethodsThe effect of oleate in the cardiovascular insulin resistance, vascular dysfunction, inflammation, proliferation and apoptosis of VSMCs were analyzed by Western blot, qRT-PCR, BrdU incorporation and cell cycle analysis.ResultsPalmitate induced insulin resistance. However, oleate not only did not induce cardiovascular insulin resistance but also had a protective effect against insulin resistance induced by palmitate or TNFα. One mechanism involved might be the prevention by oleate of JNK-1/2 or NF-κB activation in response to TNF-α or palmitate. Oleate reduced MCP-1 and ICAM-1 and increased eNOS expression induced by proinflammatory cytokines in ECs. Furthermore, oleate impaired the proliferation induced by TNF-α, angiotensin II or palmitate and the apoptosis induced by TNF-α or thapsigargin in VSMCs.ConclusionsOur data suggest a differential role between oleate and palmitate and support the concept of the cardioprotector role of oleate as the main lipid component of virgin olive oil. Thus, oleate protects against cardiovascular insulin resistance, improves endothelial dysfunction in response to proinflammatory signals and finally, reduces proliferation and apoptosis in VSMCs that may contribute to an ameliorated atherosclerotic process and plaque stability.Electronic supplementary materialThe online version of this article (doi:10.1186/s12933-015-0237-9) contains supplementary material, which is available to authorized users.
Highlights
Several translational studies have identified the differential role between saturated and unsaturated fatty acids at cardiovascular level
We found that oleate reduces plasminogen activator inhibitor-1 (PAI-1) protein levels induced by TNF-α in vascular smooth muscle cells (VSMCs), and we show that increased PAI-1 induced by TNF-α is through activation of Nuclear factor kappa B (NF-κB), given that parthenolide decreases PAI-1 levels induced by TNF-α in VSMCs
In conclusion, our results show that oleic acid has a beneficial effect at cardiovascular level as compared with saturated fatty acids such as palmitic acid
Summary
Several translational studies have identified the differential role between saturated and unsaturated fatty acids at cardiovascular level. The molecular mechanisms that support the protective role of oleate in cardiovascular cells are poorly known. For these reasons, we studied the protective role of oleate in the insulin resistance and in the atherosclerotic process at cellular level such as in cardiomyocytes (CMs), vascular smooth muscle cells (VSMCs) and endothelial cells (ECs). We have studied the protective role of oleate in insulin resistance and in the early and late atherosclerotic process and its instability at the cellular level To assess this objective, we analyzed the insulin signalling in cardiovascular cells such as endothelial cells (ECs), vascular smooth muscle cells (VSMCs) and cardiomyocyte cells (CMs), the latter two cell lines were generated by our laboratory. Our data provide a new insight on the differential effect of oleate versus palmitate giving support to recent findings that highlight the beneficial effects of oleic acid as an essential component of the Mediterranean diet at cardiovascular level
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