Cross-sectional associations of C-reactive protein with vascular risk factors and vascular complications in the DCCT/EDIC cohort.
OBJECTIVE
To determine the relationships between C-reactive protein (CRP) levels and features of Type 1 diabetes.


METHODS
Serum CRP was measured by nephelometry in a cross-sectional study of the Diabetes Control and Complications Trial/Epidemiology of Diabetes Interventions and Complications (DCCT/EDIC) cohort (n=983) and nondiabetic subjects (n=71).


RESULTS
CRP levels [geometric mean (95% CI)] were higher in diabetic than in control subjects, 1.6 (1.5-1.7) vs. 1.2 (1.1-1.5) mg/l, P=.019. CRP was higher in diabetic women (n=438) than in men (n=545) [2.0 (1.8-2.3) vs. 1.3 (1.2-1.5), P<.001]. Diabetic subjects formerly in the DCCT intensive treatment group had higher CRP levels than those who were randomized to the conventional treatment group [1.8 (1.6-1.9), n=479 vs. 1.5 (1.3-1.6), n=456, P=.010], attributable to greater BMI in the prior intensive group. In diabetes, CRP correlated with HbA(1c) (r=0.13, P<.0001) and with insulin resistance traits: BMI (r=0.34, P<.0001), waist-to-hip ratio (WHR; males: r=0.35, P<.0001; females: r=0.22, P<.0001), diastolic blood pressure (r=0.07, P=.025), triglycerides (r=0.19, P<.0001), apoB (r=0.22, P<.0001), LDL particle concentration (r=0.26, P<.0001), and LDL particle size (r=-0.22, P<.0001). CRP was not associated with complications. Significant independent predictors of CRP in diabetes were gender, BMI, WHR, concurrent HbA(1c), and oral contraceptive pill use.


CONCLUSIONS
CRP was elevated relative to nondiabetic subjects, and in diabetes was higher in females. Elevated CRP in Type 1 diabetes was associated with poor glycemic control, larger body habitus, and other factors that comprise the insulin resistance syndrome. Nevertheless, CRP levels were not associated with complications. Longitudinal studies are warranted.
Jenkins
Alicia J
AJ
Division of Endocrinology, Diabetes, and Medical Genetics, Medical University of South Carolina, Charleston, SC, USA. jenkinsa@medstv.unimelb.edu.au
Rothen
Michelle
M
Klein
Richard L
RL
Moller
Karina
K
Eldridge
Leslie
L
Zheng
Deyi
D
Durazo-Arvizu
Ramon
R
McGee
Daniel
D
Lackland
Daniel
D
Thorpe
Suzanne R
SR
Garvey
W Timothy
WT
Lyons
Timothy J
TJ
D000328:Adult; D002097:C-Reactive Protein / Q000378:metabolism*; D015331:Cohort Studies; D003922:Diabetes Mellitus, Type 1 / Q000097:blood / Q000150:complications* / Q000378:metabolism*; D003925:Diabetic Angiopathies / Q000097:blood / Q000453:epidemiology*; D005260:Female; D006442:Glycated Hemoglobin / Q000378:metabolism; D006801:Humans; D006973:Hypertension / Q000097:blood; D008055:Lipids / Q000097:blood; D008297:Male; D012307:Risk Factors; D012727:Sex Characteristics
D002097:C-Reactive Protein; D006442:Glycated Hemoglobin; D008055:Lipids