Circulating MCP-1 level and ~2518 gene polymorphism as a marker of nephropathy development in Egyptian patients

الملخص EN

Abstract Objective : Monocyte chemoattractant protein-1 (MCP-1) is a member of CC chemokine that plays an important role in the recruitment of monocytes/macrophages into renal tubulointerstitium.

A biallelic A/G polymorphism at position -2518 in the MCP-1 gene was found to regulate MCP-1 expression.

MCP-1 and its A/G gene polymorphism have been implicated in the pathogenesis of some renal diseases.

The aim of this study was to evaluate the role of circulating MCP-1 level and the relevance of functional genetic variations of MCP-1 as early predictors of the development of glomerulonephropathy (GN) in Egyptian patients.

Methods : This is a case control study that was conducted in 50 GN patients, 20 non-GN cases and 20 ethnically matched healthy controls.

MCP-1 serum level was detected by ELISA technique, while genotyping of polymorphisms in the MCP-1 genes was performed using a polymerase chain reaction (PCR) followed by restriction fragment length polymorphism (RFLP) detection.

Results : High MCP-1 circulating levels and subsequently MCP-1 _2518G polymorphism are associated with the developing of nephropathy irrespective to the underlying etiology.

MCP-1 serum level was significantly high when compared with healthy controls (P = 0.0007) and non-GN cases (P = 0.01).

There was predominance of A allele at _2518 of MCP-1 gene in healthy controls (87.5 %) and non-GN cases (77.5 %).

The frequency of the _2518G MCP-1 polymorphism was significantly higher in GN patients than in healthy controls (P < 0.0001 ; OR = 15.6) and non-GN cases (P < 0.0001 ; OR = 7.7).

Interestingly, homozygosity for G allele plays the main role in such association.

Conclusion : A / G polymorphism in MCP-1 gene and subsequently high circulating MCP-1 level confer a relevant role in the susceptibility to the development of nephropathy in the Egyptian population denoting that MCP-1 system could be an early predictor of such renal complication.