Study of the relationship between APOA-II -265T>C polymorphism and HDL function in response to weight loss in overweight and obese type 2 diabetic patients

Background: It has been reported that people may respond differently to the same environmental changes because of genome variations. Objective: The main purpose of the present study is to determine gene-diet interactions between -265T>C apolipoprotein A-II polymorphisms and evaluate the effect of weight loss on parameters related to HDL function. Methods: In the present study, 56 overweight and obese type 2 diabetic patients were chosen from 697 genotype-specified subjects. After matching for gender, age and BMI, an equal number of patients were chosen for each genotype of APOA-II (TT/TC and CC group). After six-week calorie restriction programme, 44 patients completed the study. Serum paraoxonase-1 (PON1), paraoxonase-3 (PON3), pentraxin-3 (PTX3), and PTX3 gene expression in peripheral blood mononuclear cells were compared between two genotypes and also before and after the intervention separated in each genotype. Results: The mean differences of PON enzymes and PTX3 between groups were not significant at the baseline. After weight loss, the mean weight, BMI and serum concentration of PON1 and PON3 decreased significantly and PTX3 increased in total population. Although, the mean differences of PON enzymes and PTX3 between two groups were not significant. However, in comparison of mean differences within the groups, decreased PON3 and increased PTX3 have been observed only in TT group. Conclusion: A comparison of the mean differences in PON3 and PTX3 within two genotype groups showed that T allele carriers are more sensitive to lifestyle modification, and serum PON3 and PTX3 levels significantly changed only in the TT/TC group.