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Effects of Complement Regulators and Chemokine Receptors in Type 2 Diabetes
B Aydin Ozgur1,2, E Coskunpinar3, S Bilgic Gazioglu1
1Department of Immunology, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Turkey.
Insights
Complement regulatory proteins CD55 and CD59, and chemokine genes SDF-1 and CXCR-4, are linked to type 2 diabetes mellitus (T2DM) and its complications. Lower CD55/CD59 levels and specific SDF-1/CXCR-4 gene variants increase T2DM risk and complications like nephropathy and retinopathy.
Area of Science:
- Endocrinology and Metabolism
- Immunology
- Genetics
Background:
- Complement regulatory proteins CD55 and CD59 are implicated in diabetes progression.
- Stromal cell-derived factor 1 (SDF-1) and C-X-C chemokine receptor type 4 (CXCR-4) are key chemokine signaling molecules.
Purpose of the Study:
- To investigate the association of CD55 and CD59 expression levels with type 2 diabetes mellitus (T2DM).
- To examine the relationship between SDF-1 and CXCR-4 gene polymorphisms and T2DM and its complications.
- To assess the predictive value of these markers in T2DM development and progression.
Main Methods:
- Quantitative measurements of CD55 and CD59 protein expression using Flow Cytometry.
- Genotyping of SDF-1 and CXCR-4 using quantitative Reverse Transcription Polymerase Chain Reaction (qRT-PCR).
- Statistical analysis comparing marker levels and genotypes between T2DM patients and healthy controls.
Main Results:
- Significantly lower CD55 and CD59 expression observed in T2DM patients with nephropathy, retinopathy, and cardiovascular disease compared to controls.
- Increased risk of T2DM associated with CXCR-4 T allele carriage (1.6-fold).
- Elevated nephropathy risk in CXCR-4 TT genotype carriers (10-fold) and retinopathy in SDF-1 CC genotype carriers (significant association).
- SDF-1 T allele carriers showed a 5-fold increased cardiovascular risk.
Conclusions:
- CD55 and CD59 protein levels are potential biomarkers for T2DM and its complications.
- SDF-1 and CXCR-4 gene polymorphisms are significantly associated with T2DM susceptibility and the development of specific complications.
- These molecular markers may hold predictive importance for T2DM progression and associated pathologies.
Abstract:
CD55 and CD59 are complement regulatory proteins suggested to be related with progression of diabetes and its complications. The stromal cell-derived factor 1 (SDF-1) and C-X-C chemokine receptor type 4 (CXCR-4) are chemokine proteins. We aimed to investigate the relation of CD55 and CD59 expression levels and polymorphisms of SDF-1 and CXCR-4 with type 2 diabetes mellitus (T2DM) and its complications. Seventy-five T2DM patients and 73 controls were enrolled. Expression levels of CD55 and CD59 were measured by FACS Calibur; qRT-PCR was used to determine SDF-1 and CXCR-4 gene polymorphisms. CD55 and CD59 expressions in patients with nephropathy, retinopathy and cardiovascular disease were significantly lower than controls. Frequency of CXCR-4 T allele carrying was high in patients and created 1.6 fold risk for the disease (p = .07). CXCR-4 a allele carriers had decreased nephropathy; although there was no statistical significance in carrying CXCR-4 T allele, presence of nephropathy was approximately 2 times higher (p = .254). The nephropathy risk increased 10-fold in CXCR-4 TT genotype carriers (p = .02). All SDF-1 CC genotype carriers had retinopathy, so, it was considered that the CC genotype was effective in retinopathy development (p = .031). For the presence of cardiovascular disease, significant difference was observed for SDF-1 genotypes. Increased cardiovascular risk of 5- and 1.9-fold in SDF-1 T (p = .007) and CXCR-4 T (p = .216) allele carriers, respectively, was observed. We suggest that CD55 and CD59 protein levels and SDF-1 and CXCR-4 have predictive importance in process, complications and tendency of T2DM.
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