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RAPID COMMUNICATION |
Institute for Clinical Diabetes Research, German Diabetes Centre, Leibniz Institute at Heinrich Heine University, 40225 Düsseldorf, Germany1 Institute of Epidemiology, Helmholtz Zentrum München, German Research Centre for Environmental Health, 85764 Neuherberg, Germany2 Institute of Medical Information Processing, Biometry and Epidemiology, Chair of Epidemiology, Ludwig-Maximillians-Universität, 81377 München, Germany3 Department of Internal Medicine II-Cardiology, University of Ulm Medical Center, Robert-Koch-Street 8, 89081 Ulm, Germany
(Correspondence should be addressed to W Koenig; Email: wolfgang.koenig{at}uniklinik-ulm.de)
Objective: Regulated on activation, normal T-cell expressed and secreted (RANTES)/chemokine(C-C motif) ligand (CCL5) is expressed by adipocytes, and serum levels of RANTES are increased in obesity and type 2 diabetes. The aim of this study was to test the hypothesis that RANTES is involved in the pathogenesis of type 2 diabetes by analyzing the triangular association between CCL5 gene polymorphisms, systemic RANTES concentrations, and incident type 2 diabetes in a large prospective study.
Subjects and methods: The study is based on 502 individuals (293 men and 209 women) and 1632 individuals (859 men and 773 women) with and without incident type 2 diabetes from the population-based MONItoring of Trends and Determinants in Cardiovascular Disease (MONICA)/Cooperative Health Research in the Region of Augsburg (KORA) case–cohort study respectively (mean follow-up time±S.D. 10.1±4.9 years). CCL5 genotypes and RANTES serum concentrations were determined and associations between genotypes, haplotypes, serum levels, and incident type 2 diabetes were assessed.
Results: Minor alleles of four single nucleotide polymorphisms were associated with lower RANTES levels (Padditive between 1.2x10–9 and 3.1x10–8), but neither genotypes, haplotypes, nor serum levels were associated with incident type 2 diabetes.
Conclusions: Our data suggest that RANTES/CCL5 gene variants and serum levels are not causally related with type 2 diabetes and that elevated RANTES levels in patients with type 2 diabetes may be a consequence of hyperglycemia. However, our findings cannot preclude a local role in adipose tissue where RANTES expression may contribute to leukocyte infiltration and a proinflammatory state.
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