Role of the frequency of blood CD4(+) CXCR5(+) CCR6(+) T cells in autoimmunity in patients with Sjögren's syndrome

Biochemical and Biophysical Research Communications
Xue-yi LiPing Zhu

Abstract

The blood CD4(+) CXCR5(+) T cells, known as "circulating" Tfh, have been shown to efficiently induce naïve B cells to produce immunoglobulin. They play an important role in certain autoimmune diseases. In the present study, we show for the first time that the frequency of CD4(+) CXCR5(+) T cells is increased in pSS patients and positively correlated with autoantibodies in the blood. The concentration of Th17-like subsets (CD4(+) CXCR5(+) CCR6(+)) in pSS patients was found to be significantly higher than in healthy controls. Functional assays showed that activated Th17-like subtypes in the blood display the key features of Tfh cells, including invariably coexpressed PD-1, ICOS, CD40L and IL-21. Th17 subsets were found to highly express Bcl-6 protein and Th1 and Th2 were not. Bcl-6 is believed to be a master transforming factor for Tfh cell differentiation and facilitate B cell proliferation and somatic hypermutation within the germinal center. These data indicate that Th17 subsets of CD4(+) CXCR5(+) T cells in the blood may participate in the antibody-related immune responses and that high frequency of CD4(+) CXCR5(+) CCR6(+) Tfh cells in blood may be suitable biomarkers for the evaluation of the active immune stage of pSS patie...Continue Reading

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