Affiliation:
1. Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, University of Florida Jacksonville College of Medicine, Jacksonville, FL 32206, USA
Abstract
The biological effects of fatty acids differ by their structure. Saturated fatty acids and trans-fatty acids are recognized as promoters of coronary artery disease (CAD), while monounsaturated and omega-3 fatty acids may have salutary effects. Since cellular stress is recognized as a fundamental driver of CAD, the effect of these fatty acids on endoplasmic reticulum (ER) stress in human coronary artery endothelial cells (HCAECs) was measured using the ER stress-responsive alkaline phosphatase (ES-TRAP) assay. Docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), and eicosapentaenoic acid ethyl ester (EPA-EE) suppressed ER stress induced with pharmacologic (tunicamycin) and physiologic (high-dextrose concentration) ER stress inducers. In tunicamycin-treated cells, DHA reduced the expression of unfolded protein response (UPR) markers such as phosphorylation of inositol requiring enzyme 1α (IRE1α) and protein kinase R-like endoplasmic reticulum kinase (PERK) and increased activating transcription factor 6 (ATF6) and glucose regulated protein 78 (GRP78) expression. Similarly, treatment with both oleic acid and arachidonic acid, but not elaidic acid (a trans-fatty acid), suppressed both tunicamycin and high-dextrose-induced ER stress while treatment with saturated fatty acids (C14 : 0, C16 : 0, and C18 : 0) enhanced both tunicamycin and high-dextrose-induced ER stress. The latter fatty acids at higher concentrations caused cytotoxicity. These results indicate that omega-3 fatty acids as well as select unsaturated fatty acids and arachidonic acid suppress ER stress in HCAEC.
Subject
Cell Biology,Pharmacology,Food Science,Biophysics
Cited by
1 articles.
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