In humans, resistin is predominantly expressed in monocytes and macrophages, and involved in insulin resistance, atherosclerosis, and cardiovascular diseases. We previously reported that the G/G genotype of single nucleotide polymorphism (SNP) at -420 (rs1862513) in the human resistin gene increased susceptibility to type 2 diabetes. Genetically, serum resistin was positively associated with the number of the G-allele at SNP-420 in the general Japanese population. Epigenetically, serum resistin was inversely associated with methylation of the C-allele at SNP-420. However, interaction between SNP-420 and environmental factors remains to be elucidated. The aim of this study was to investigate the association between serum resistin and physical activity, and the effect of SNP-420 on this association. The Toon Genome Study is a cohort study of Japanese community-dwelling subjects. A total of 1981 participants were cross-sectionally analyzed. Serum resistin was measured by ELISA. Physical activity was measured for 7 days using a waist-worn accelerometer (Lifecorder, Suzuken Co). Physical activity was also assessed using a questionnaire (the Japan Arteriosclerosis Longitudinal Study Physical Activity Questionnaire, JALSPAQ). Serum resistin was inversely associated with the quartile of moderate-intensity (3Mets or more) physical activity time (Q1 12.8, Q2 12.2, Q3 12.3, Q4 11.6 ng/ml; P for trend = 0.005; after adjustment for age, gender, and BMI). This inverse association was strongest in the C/C genotype of SNP-420. HOMA-IR was positively associated with serum resistin, and inversely associated with moderate-intensity physical activity time in the C/C genotype (Q1 1.51, Q2 1.52, Q3 1.36, Q4 1.32; P for trend = 0.01; after adjustment for age, gender, and BMI). Therefore, serum resistin and insulin resistance were inversely associated with physical activity in the C/C genotype of SNP-420 in the general Japanese population.
R. Kawamura: None. Y. Tabara: None. Y. Takata: None. M. Takakado: None. Y. Matsushita: None. T. Hadate: None. H. Onuma: None. K. Maruyama: None. T. Tanigawa: None. I. Saito: None. H. Osawa: None.