Relationship between circulating n-3 fatty acid concentrations and endothelial function in early adulthood.

Area of Science:

• Cardiovascular Biology
• Nutritional Science
• Vascular Medicine

Background:

• Fish consumption is linked to reduced cardiovascular mortality, attributed to omega-3 (n-3) fatty acids.
• The impact of n-3 fatty acids on early atherosclerosis and endothelial function is not fully understood.
• This study investigates the association between circulating n-3 fatty acids and endothelial function in young adults.

Purpose of the Study:

• To determine if circulating n-3 fatty acid levels are associated with vascular endothelial function in early adulthood.
• To explore potential protective effects of n-3 fatty acids on early vascular biology.
• To examine these associations in specific subgroups, including smokers and individuals with metabolic risk factors.

Main Methods:

• Recruitment of 326 young adults (aged 20-28 years).
• High-resolution ultrasound to measure flow-mediated brachial artery dilatation (FMD) and endothelium-independent arterial response.
• Measurement of plasma and erythrocyte membrane levels of n-3 fatty acids, specifically docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA).

Main Results:

• Overall, n-3 fatty acid levels showed no significant association with vascular function in the entire cohort.
• In smokers, higher n-3 fatty acid levels (plasma DHA) were positively correlated with improved FMD (P=0.01).
• Positive associations between n-3 fatty acids and FMD were observed in individuals with high fasting insulin, glucose, or triglyceride levels.

Conclusions:

• In young smokers and those with elevated insulin, glucose, or triglyceride levels, n-3 fatty acids were positively associated with endothelial function (FMD).
• These findings suggest that physiological levels of circulating n-3 fatty acids may offer protection to the endothelium in early adulthood.
• This highlights a potential role for n-3 fatty acids in mitigating early stages of vascular dysfunction.