Myocardial infarction does not affect fatty-acid profiles in rats

Area of Science:

• Biochemistry
• Cardiovascular Science
• Biomarker Research

Background:

• Plasma and red blood cell (RBC) fatty acid (FA) composition are investigated as potential biomarkers for cardiovascular (CV) risk.
• Case/control studies are crucial for CV risk assessment, but require validation regarding the impact of events like myocardial infarction (MI) on biomarker stability.

Purpose of the Study:

• To investigate the effect of MI on RBC and plasma levels of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA).
• To determine if FA profiles remain stable post-MI, validating their use in case/control studies.

Main Methods:

• Rats underwent either MI or sham-MI surgery, with FA profiles analyzed 24 hours post-procedure.
• Statistical tests for differences and equivalence were employed to compare FA levels between MI, sham-MI, and control groups.

Main Results:

• RBC levels of EPA, DHA, and most other FAs remained unchanged and statistically equivalent between control and MI rats.
• Plasma exhibited significant changes in 8 out of 22 FAs post-MI, including a reduction in EPA.
• Sphingolipid-associated fatty acids were the only RBC FAs altered by MI or sham surgery.

Conclusions:

• RBC fatty acid levels, including EPA and DHA, are robust and unaffected by myocardial infarction or sham surgery.
• Plasma fatty acid profiles are significantly altered post-MI, indicating potential prognostic value but cautioning against their use in certain case/control study designs.
• The stability of RBC FAs supports their utility as reliable biomarkers in studies investigating cardiovascular risk.