Abstract
Background
The pathogenesis of proliferative diabetic retinopathy (PDR) remains poorly understood. Recent studies have implicated that monocyte chemoattractant protein-1 (MCP-1) is associated with diabetic microvascular or macrovascular complications. However, the relationship between single nucleotide polymorphism(SNP)c.2518A/G -rs1024611 in the MCP-1 gene with diabetic retinopathy remains controversial. In the present study, we evaluated the association of SNP in the MCP-1 gene with diabetic retinopathy (DR) and diabetic macular edema (DME) in a Chinese population from Northern China with type 2 diabetes.
Methods
We conducted a case–control study, which enrolled 1,043 subjects with type 2 diabetes (528 with DR, including 277PDR; 515 without DR), and SNP genotyping of c.2518A/G in the MCP-1 gene was performed using the polymerase chain reaction. Genomic DNA was isolated from 3 ml samples of whole blood using a modified conventional DNA extraction method. The genotype and allele frequencies of 2518A/G were studied by using an automated DNA sequencer (ABI PRISM 3730 DNA Sequencer).
Results
The demographic and clinical characteristics did not differ among genotype subgroups. The MCP-1(−2518) GG genotype was significantly associated with DR susceptibility with OR of 1.481 (95 % CI, 1.019-2.153) (P = 0.046). There were no significant differences in the MCP-1(−2518) G allele frequencies in DR compared to non-diabetic retinopathy (DNR) (P > 0.05, OR = 0.841, 95 % CI, 0.705–1.002). The MCP-1(−2518) GG genotype was significantly associated with high-risk PDR susceptibility with OR of 2.656 (95 % CI, 1.222–5.775) (P = 0.014). The MCP-1(−2518) G allele was significantly increased in high-risk PDR patients (P = 0.020, OR = 1.481, 95 % CI, 1.070–2.051) compared with A allele. Genotype and allele frequencies of various DME of the DR patients were compared, but there were no significant associations established (P > 0.05).
Conclusions
It is likely that the MCP-1 c.2518G/G genotype is a susceptibility gene for DR in Chinese type 2 diabetic patients, especially the high-risk PDR. There is no association with DME and c.2518G/G .
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Acknowledgments
Li Dong, Xiao Ying lv, Bin Jie Wang carried out the experiment, data analysis and manuscript preparation. Ye Qing Wang, Hua Mu, Zhuo Lei Feng and Ping Liu were involved in the experimental design, sample collection, and grant and ethics applications. This work was supported by a grant from Heilongjiang Provincial Department of Education Science and Technology Research. (12531414)
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Dong, L., lv, X.Y., Wang, B.J. et al. Association of monocyte chemoattractant protein-1 (MCP-1)2518A/G polymorphism with proliferative diabetic retinopathy in northern Chinese type 2 diabetes. Graefes Arch Clin Exp Ophthalmol 252, 1921–1926 (2014). https://doi.org/10.1007/s00417-014-2651-1
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DOI: https://doi.org/10.1007/s00417-014-2651-1