The aim of the study was to assess the relationship between the CCR5-Δ32 polymorphism and the risk of diabetic retinopathy (DR) in patients with DM1.
We examined 420 patients and 350 healthy controls. The analysis concerned CCR5-Δ32 polymorphism as well as levels of serum inflammatory markers (CRP, TNF-α), adhesion molecules (VCAM, ICAM-1, ICAM-3) and CCR5 ligand (MCP-1).
We found a negative association between DM1 and Δ32 allele. Moreover, the frequency of Δ32 allele was higher in a group with DR in comparison to control subjects without this complication. We also found that Δ32 carriers had the highest levels of: HbA1c, inflammatory markers, adhesion molecules and CCR5 ligand.
The findings of our studies suggest that the CCR5-Δ32 polymorphism is associated with DM1 such that the Δ32 allele protects against the development of DM1 and increases the risk of DR in patients who have already developed the disease.