Association of estrogen receptor α gene polymorphisms with cytokine genes expression in systemic lupus erythematosus

Abstract

Aim To analyze the association of estrogen receptor a (ORa) gene polymorphisms with cytokine genes expression in patients with systemic lupus erythematosus (SLE) and controls. Methods Genomic DNA was extracted and polymorphisms of XbaI (XX, Xx, or xx genotype) and PvuII (PP, Pp, or pp) in intron 1 of ORα gene were detected by polymerase chain reaction-restriction fragment length polymorphisms (PCR-RFLP) method. The messenger RNA (mRNA) levels of interleukin (IL)-10, IL-4, interferon (IFN)-γ, and IL-2 were assessed by semiquantitative reverse transcription polymerase chain reaction (RT-PCR). Results In patients with SLE with PpXx genotype, IL-10 and IL-4 mRNA expression was higher (P < 0.001 and P = 0.013, respectively), while in patients with SLE with Ppxx genotype IFN-γ and IL-2 mRNA expression was lower than in controls (P < 0.001). There was no significant difference in mRNA expression of 4 cytokines among controls with various genotypes. Conclusion ORa gene polymorphism may be associated with the expression of IL-10, IL-4, IL-2, and IFN-γ in patients with SLE.