系统性硬化病患者外周血CD4+ T细胞CD40L DNA甲基化研究

Abstract

Abstract:

Objective To study the methylation status of CD40L gene regulatory regions in peripheral blood CD4+ T cells from patients with systemic sclerosis（SSc）. Methods Peripheral blood mononuclear cells were isolated from the venous blood of 21 SSc patients and 20 healthy controls by density gradient centrifugation. CD4+ T cells were separated by using magnetic beads. Genomic DNA was isolated from the CD4+ T cells and treated with sodium bisulfite. Nested PCR was performed to amplify the desired regulatory sequences （including the promotor and enhancer） of CD40L, and the amplicons were transformed into the Escherichia coli DH5α. Subsequently, 8 independent clones were selected and sequenced for each of the amplified fragments. Results In healthy female controls, half of the cloned fragments of CD40L regulatory sequences were unmethylated, and the other half were methylated. The mean methylation levels of CD40L promoter and enhancer from female SSc patients were significantly lower than those from healthy female controls（both P < 0.01）. Almost all of the cloned fragments of CD40L promoter and enhancer were unmethylated in healthy male controls and male SSc patients, with no significant difference in the methylation level between male SSc patients and healthy controls （both P > 0.05, respectively）. Conclusions There is a low methylation level of CD40L regulatory elements on the inactive X chromosome in female SSc patients, which may contribute to the CD40L overexpression in CD4+ T cells.

Key words: DNA methylation

References

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DNA methylation status of CD40L in peripheral blood CD4+ T cells from patients with systemic sclerosis

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