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Eicosapentaenoic acid protects endothelial cell function injured by hypoxia/reoxygenation
I Morita1, Y W Zhang, S I Murota
1Department of Cellular Physiological Chemistry, Graduate School, Tokyo Medical and Dental University, Japan. morita.cell@tmd.ac.jp
Annals of the New York Academy of Sciences
|January 25, 2002
Summary
Eicosapentaenoic acid (EPA) protects against endothelial cell dysfunction caused by hypoxia/reoxygenation (H/R). EPA inhibits tyrosine kinase activation, preserving gap junctional intercellular communication (GJIC) and potentially preventing atherosclerosis.
Area of Science:
- Cardiovascular Science
- Cell Biology
- Biochemistry
Background:
- Atherosclerosis is a risk factor linked to ischemia/reperfusion injury.
- Eicosapentaenoic acid (EPA) may protect against atherosclerosis via lipid metabolism and vascular cell function.
- Hypoxia/reoxygenation (H/R) induces endothelial cell dysfunction, impacting gap junctional intercellular communication (GJIC).
Purpose of the Study:
- To investigate the protective effects of EPA on H/R-induced endothelial cell dysfunction.
- To determine EPA's impact on GJIC under H/R conditions.
- To elucidate the molecular mechanisms underlying EPA's protective action.
Main Methods:
- Utilized human umbilical vascular endothelial cells (HUVECs).
- Measured GJIC using a photobleaching technique.
- Assessed the role of reactive oxygen species, tyrosine kinase, and tyrosine phosphatase.
Main Results:
- H/R induced a significant reduction in HUVEC GJIC.
- EPA pretreatment inhibited H/R-induced GJIC reduction.
- EPA's protective effect was linked to the inhibition of tyrosine kinase activation, not reactive oxygen species.
- Tyrosine kinase inhibitors mimicked EPA's protective effect, while tyrosine phosphatase inhibitors enhanced it.
Conclusions:
- EPA improves H/R-induced endothelial dysfunction by inhibiting tyrosine kinase activation.
- EPA preserves GJIC, suggesting a role in preventing or slowing atherosclerosis progression.
- EPA represents a potential therapeutic strategy for mitigating H/R-related vascular damage.