Published in:
01-07-2011 | Article
HLA-DRB1 reduces the risk of type 2 diabetes mellitus by increased insulin secretion
Authors:
R. C. Williams, Y. L. Muller, R. L. Hanson, W. C. Knowler, C. C. Mason, L. Bian, V. Ossowski, K. Wiedrich, Y. F. Chen, S. Marcovina, J. Hahnke, R. G. Nelson, L. J. Baier, C. Bogardus
Published in:
Diabetologia
|
Issue 7/2011
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Abstract
Aims/hypothesis
We sought to identify the physiological implications of genetic variation at the HLA-DRB1 region in full-heritage Pima Indians in Arizona.
Methods
Single-nucleotide polymorphisms from the HLA region on chromosome 6p were tested for association with skeletal muscle mRNA expression of HLA-DRB1 and HLA-DRA, and with type 2 diabetes mellitus and prediabetic traits.
Results
The A allele at rs9268852, which tags HLA-DRB1*02(1602), was associated both with higher HLA-DRB1 mRNA expression (n = 133, p = 4.27 × 10−14) and decreased risk of type 2 diabetes (n = 3,265, OR 0.723, p = 0.002). Among persons with normal glucose tolerance (n = 266) this allele was associated with a higher mean acute insulin response during an intravenous glucose tolerance test (p = 0.005), higher mean 30 min insulin concentration during an oral glucose tolerance test (p = 0.017) and higher body fat percentage (p = 0.010). The polymorphism was not associated with HLA-DRA mRNA expression or insulin sensitivity.
Conclusions/interpretation
HLA-DRB1*02 is protective for type 2 diabetes, probably by enhancing self tolerance, thereby protecting against the autoimmune-mediated reduction of insulin secretion.