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Red Blood Cell Omega-6 Fatty Acids and Biomarkers of Inflammation in the Framingham Offspring Study
Heidi T M Lai1, Nathan A Ryder1, Nathan L Tintle1
1Fatty Acid Research Institute, Sioux Falls, SD 57106, USA.
Insights
This study found weak but significant inverse associations between red blood cell omega-6 polyunsaturated fatty acids (PUFAs) and inflammation markers. Findings suggest omega-6 PUFAs may not be pro-inflammatory, challenging common beliefs.
Area of Science:
- Nutrition Science
- Inflammation Research
- Cardiovascular Health
Background:
- Chronic inflammation is a risk factor for various health disorders.
- Omega-6 polyunsaturated fatty acids (PUFAs) have debated pro- or anti-inflammatory roles.
- Dietary recommendations for omega-6 PUFAs vary due to conflicting evidence.
Purpose of the Study:
- To investigate the association between red blood cell (RBC) levels of omega-6 PUFAs and inflammation biomarkers.
- To determine if major dietary and circulating omega-6 PUFAs correlate with ten inflammation markers.
- To clarify the role of omega-6 fatty acids in inflammatory pathways.
Main Methods:
- Analysis of 2777 participants from Framingham Offspring and Omni cohorts.
- Measurement of red blood cell membrane levels of major omega-6 PUFAs (linoleic acid and arachidonic acid).
- Calculation of partial correlation coefficients between omega-6 PUFAs and ten inflammation biomarkers.
Main Results:
- Red blood cell linoleic acid showed inverse correlations with C-reactive protein, soluble interleukin-6, intercellular adhesion molecule-1, monocyte chemoattractant protein-1, and P-selectin.
- Red blood cell arachidonic acid showed inverse correlations with soluble interleukin-6, intercellular adhesion molecule-1, monocyte chemoattractant protein-1, and osteoprotegerin.
- No significant correlations were found with lipoprotein-associated phospholipase-A2, urinary isoprostanes, or tumor necrosis factor receptor-2.
Conclusions:
- Weak but statistically significant inverse associations exist between RBC omega-6 PUFAs and several inflammation biomarkers.
- The study's findings do not support the hypothesis that omega-6 fatty acids are inherently pro-inflammatory.
- Results suggest a potentially anti-inflammatory role for omega-6 PUFAs in a community-based setting.
Background/Objectives:
Chronic inflammation is recognized as an important risk factor for a variety of health disorders. Omega-6 polyunsaturated fatty acids (n-6 PUFAs), particularly linoleic (LA) and arachidonic acid (AA), have been shown to be either pro- or anti-inflammatory, and researchers have advocated both for and against reducing their dietary intake. This study sought to correlate the levels of ten inflammation-related biomarkers across multiple pathways with red blood cell (RBC) membrane levels of the major dietary and circulating n-6 PUFAs.
Methods:
We included 2777 participants (mean age: 66 ± 9 years, 54% women, 9.8% minorities) from the Framingham Offspring and minority-enriched Omni cohorts, and calculated partial correlation coefficients.
Results:
After multivariable adjustment, RBC LA was inversely correlated (all p ≤ 0.05) with five markers of inflammation, receptors, or pathways: C-reactive protein (r = -0.06); soluble interleukin-6 (r = -0.15); intercellular adhesion molecule-1 (r = -0.09); monocyte chemoattractant protein-1 (r = -0.07); and P-selectin (r = -0.07). RBC AA was inversely correlated (all p ≤ 0.05) with soluble interleukin-6 (r = -0.10); intercellular adhesion molecule-1 (r = -0.14); monocyte chemoattractant protein-1, and (r = -0.06); and osteoprotegerin (r = -0.07). Lipoprotein-associated phospholipase-A2 mass and activity, urinary isoprostanes, and tumor necrosis factor receptor-2 were not significantly correlated with LA or AA.
Conclusions:
In our large community-based study, we observed weak but statistically significant inverse associations between several types of inflammatory biomarkers with RBC n-6 PUFAs. Our findings do not support the hypothesis that omega-6 fatty acids are pro-inflammatory.
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