Gene‐diet interaction effects during a supplementation with n‐3 PUFA on both plasma and gene expression levels of inflammatory markers (1037.9)

Abstract

Objective: To test whether gene expression of inflammatory genes is altered following an n‐3 PUFA supplementation and to test for any possible gene‐diet interactions modulating plasma inflammatory biomarker levels. Methods: 210 subjects completed a 6‐wk n‐3 PUFA supplementation with 5g/d of fish oil. Gene expression of TNF and IL6 was assessed in peripheral blood mononuclear cells (PBMC) using the TaqMan technology adjusted for the endogenous control (GAPDH). Genotyping of 20 SNPs from the TNF‐LTA gene cluster, IL1β, IL6 and CRP genes was performed. Results: Gene expression of TNF and IL6 increased after the 6‐wk n‐3 PUFA supplementation as shown by 2‐ΔΔCt values >1 (mean±SD, 1.05±0.39 and 1.18±0.50, respectively). In a MIXED model for repeated measures adjusted for the effects of age, sex and BMI, gene by supplementation interactions effects were observed for rs1143627, rs16944, rs1800797, and rs2069840 on IL6 levels, for rs2229094 on TNF‐alpha levels and for rs1800629 on CRP levels (p<0.05 for all). Conclusions: An n‐3 PUFA supplementation could alter gene expression levels of TNF and IL6 in PBMC. Also, the large inter‐individual variability in plasma inflammatory markers following an n‐3 PUFA supplementation may be influenced by genetic variations in inflammatory genes.Grant Funding Source: CIHR