AI Article Synopsis

  • The study investigates the impact of the G-1082A polymorphism in the IL-10 gene on the progression of two types of kidney diseases: IgA nephropathy (IgAN) and focal segmental glomerulosclerosis (FSGS).
  • Patients were divided into slow and fast progressors based on their kidney function over time, revealing a connection between certain genotypes and faster disease progression.
  • Findings indicate that the GA/AA genotypes are associated with worse kidney survival outcomes, making this polymorphism a potentially important marker for predicting disease progression in affected patients.

Article Abstract

Background: Interleukin-10 (IL-10) is a cytokine with immunosuppressive properties. We evaluated the influence of G-1082A polymorphism in the IL-10 gene promoter, which has been associated with modified IL-10 production, on the two most common forms of primary glomerulonephritis: IgA nephropathy (IgAN) and focal segmental glomerulosclerosis (FSGS).

Methods: We studied Caucasian patients (N= 191) with biopsy-proven glomerulonephritis (IgAN: N= 123, FSGS: N= 68) followed-up for 6.5 +/- 5.5 years. Patients were classified according to the slope of reciprocal serum creatinine (>/= or <-0.1 dL(*)mg(-1) (*)year(-1)) into group A (slow progressors, IgAN: N= 75, FSGS: N= 47) and group B (fast progressors, IgAN: N= 48, FSGS: N= 21). One hundred healthy volunteers were analyzed as control patients. G-1082A polymorphism was determined by polymerase chain reaction (PCR) amplification.

Results: The allele frequencies were similar in patients and control group (NS). Initial renal function, proteinuria, and blood pressure did not differ significantly between patients with different genotypes. G-1082A polymorphism was associated with the progression of both IgAN and FSGS: GA/AA genotypes were more frequent in group B (fast progressors) than in group A (slow progressors; P= 0.012 for IgAN, P < 0.05 for FSGS). Patients with the GA/AA genotypes showed a worse outcome in the Kaplan-Meier analysis of renal survival (P < 0.05 for both IgAN and FSGS). The IL-10 polymorphism remained an independent risk factor for progression in multivariate analysis (Cox regression model, P < 0.05 for IgAN and FSGS).

Conclusion: Our results suggest that IL-10 gene G-1082A polymorphism is an important marker of progression in patients with IgAN and FSGS.

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http://dx.doi.org/10.1111/j.1523-1755.2004.00730.xDOI Listing

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