Elevated C-reactive protein is a risk factor for the development of type 2 diabetes in Japanese Americans.
OBJECTIVE
Increasing evidence from a cohort of Caucasians recently suggests that an elevated level of C-reactive protein (CRP) is associated with an increased risk of developing type 2 diabetes. However, Japanese subjects are skewed to lower CRP concentrations than westerners. Therefore, the effect of CRP on the development of type 2 diabetes among Japanese is unclear.


METHODS
We examined 396 male and 551 female nondiabetic Japanese Americans who underwent a 75-g oral glucose tolerance test (GTT) and were then followed for an average of 6.5 years. We investigated whether elevated serum CRP level is a risk factor in the development of type 2 diabetes among these subjects.


RESULTS
Subjects with a high CRP level showed a significantly higher incidence of type 2 diabetes compared with subjects with a low level among both men (P = 0.028) and women (P = 0.004) in a log-rank test. In a Cox proportional hazards model dividing quartiles of CRP, the hazard ratios for diabetes development in the highest versus lowest quartile of CRP levels were 2.84 (95% CI 1.09-7.39) among men and 3.11 (1.25-7.75) among women after adjustment for age, smoking, family history of diabetes, classification of a 75-g GTT, hormone replacement therapy (among women), BMI, and homeostasis model assessment.


CONCLUSIONS
Among Japanese Americans, CRP may be a risk factor for development of type 2 diabetes independent of either obesity or insulin resistance. Our results suggest that inflammation may be closely related to the mechanism of type 2 diabetes among Japanese Americans.
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001213:Asian / Q000706:statistics & numerical data*; D002097:C-Reactive Protein / Q000378:metabolism*; D003924:Diabetes Mellitus, Type 2 / Q000097:blood* / Q000208:ethnology*; D005260:Female; D006801:Humans; D007564:Japan / Q000208:ethnology; D008297:Male; D008875:Middle Aged; D016016:Proportional Hazards Models; D012307:Risk Factors; D014481:United States / Q000453:epidemiology
D002097:C-Reactive Protein