Recent studies suggest that serum homocysteine (HCY) level is correlated to inflammatory/immune factors that influence the development and progression of many diseases, such as cardiovascular disease. However, the association between serum HCY level and inflammatory/immune factors in healthy populations has not been systematically investigated. This study was conducted based on the Fangchenggang Area Male Health and Examination Survey (FAMHES) project. After comprehensive baseline analysis, we could not find any significant association between HCY level and inflammatory/immune factors. However, in the next linear regression analysis, serum C4 [age-adjusted: Beta = -0.053, 95%CI = (-3.798, -0.050), P = 0.044; multivariate adjusted: Beta = -0.064, 95%CI = (-4.271, -0.378), P = 0.019] and C-reactive protein (CRP) concentration [unadjusted: Beta = 0.056, 95%CI = (0.037, 0.740), P = 0.030] were positively related with HCY. In further binary regression analysis, a significant correlation was confirmed for C4 and HCY [age-adjusted: OR = 0.572, 95%CI = (0.359, 0.911); multivariate adjusted: OR = 0.558, 95%CI = (0.344, 0.905)]. In order to discover more potential associations, multivariate logistic regression analysis was applied and suggested that HCY and C4 were significantly correlated [age-adjusted: OR = 0.703, 95%CI = (0.519, 0.951); multivariate adjusted: OR = 0.696, 95%CI = (0.509, 0.951)]. In addition, immunoglobulin M (IgM) may influence the HCY level to some extent [unadjusted: OR = 1.427, 95%CI = (1.052, 1.936); age-adjusted: OR = 1.446, 95%CI = (1.061, 1.970); multivariate adjusted: OR = 1.447, 95%CI = (1.062, 1.973)]. Combining our results with recent studies, we propose that C4, CRP, and IgM in serum are significantly associated with HCY concentration. Further studies are needed on the mechanism of the interaction, especially among cardiovascular disease subjects.

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