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2015 ; 21
(ä): 3490-7
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Rs12976445 Polymorphism is Associated with Risk of Diabetic Nephropathy Through
Modulating Expression of MicroRNA-125 and Interleukin-6R
#MMPMID26563755
Li C
; Lei T
Med Sci Monit
2015[Nov]; 21
(ä): 3490-7
PMID26563755
show ga
BACKGROUND: Diabetic nephropathy (DN) is one of the most significant long-term
complications of diabetes mellitus (DM), and it is a primary risk factor for
end-stage renal disease. MicroRNAs (miRNAs) play important roles in regulating
the expression of genes, including interleukin-6R (IL-6R), which has been
reported to be involved in the development of DNDN. The aim of this study was to
identify the dysregulation of miRNA and its target responsible for the
development of DN in DM. MATERIAL AND METHODS: We collected the kidney tissues
from patients with DN (N=36) and control patients (N=28), and performed real-time
PCR and Western blot analysis to determine the expression of IL-6R. Computational
analysis and luciferase assay were used to identify the miRNA that regulates
IL-6R. To explore the association between rs12976445 polymorphism and risk of DN,
we enrolled 594 DM patients with (N=282) or without DN (N=312), and studied the
association between a variant in miR-125a and risk of DN in DM. RESULTS: The
expression of IL-6R was barely detected in the control groups, while in the DN
group, the IL-6R was clearly detectable. Next, miR-125a was identified as a
regulator of IL-6R by using informatics analysis and luciferase assay. A
single-nucleotide polymorphism (rs12976445) in pri-miR-125a has been shown to
compromise the mature processing of miR-125a, and we showed that the expression
levels of miR-125a was comparable between individuals carrying TT and CT, and
when combined into 1 group, the miR-125a expression was approximately 3 times
lower than in the CC group. We found significant differences regarding rs12976445
genotype distribution between the DN and the control (OR=1.45, 95%
C.I.=1.02-2.08, p<0.05) with the possible confounding factors adjusted for by
using logistic regression analysis. CONCLUSIONS: We identified miR-125a as a
direct regulator of IL-6R, and the genotype of rs12976445 might be a novel
predictor of the development of DN in DM.