科研之友
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摘要
Type 2 diabetes (T2D) is a systemic inflammatory disease. Although the natural killer group 2, member D (NKG2D) receptor, was not expressed normally on CD4+ T cells, the aberrant expression was found in pathological conditions such as in auto-immune diseases. However, the involvement of NKG2D in pathogenesis of T2D is unclear. We hypothesize that there is an inflammatory CD4+ T cell subpopulation expressing NKG2D and producing interleukin (IL)-17 in T2D. NKG2D expression on CD4+ T cells and their subsets were analyzed by multi-color staining using flow cytometry. Lymphocytes were activated by phorbol-12-myristate-13-acetate (PMA) and ionomycin, and were stained for intracellular IL-17. To investigate the mechanism of IL-17 production, patients' lymphocytes were stimulated using specific anti-T cell receptor (TCR) alone, anti-NKG2D alone or a combination of the two antibodies. CD4+T cells and particularly, CD4+ CD28(null) T subset of T2D patients were highly expressed NKG2D and more prevalent compared to non-diabetic individuals (ND) (P=0.039 and P=0.022, respectively). Significantly higher percentages of CD4 + CD28(nulI)NKG2D +T cells of patients produced IL-17 when compared to those of ND (P= 0.024) and were positively correlated with the level of glycated hemoglobin Al c (HbAlc) (R-2 = 0.386, P=0.041). Additionally, this cell population could be stimulated by specific monoclonal anti-NKG2D to produce IL-17. In conclusion, CD4+ CD28(nulI)NKG2D+T cells were expanded in T2D, especially in patients with poor glycemic control. NKG2D may be one of the surrogate co-stimulatory receptors leading to irregular inflammatory function producing IL-17. An IL-17 producing CD4 + CD28(nulI)NKG2D +T cells may potentially be involved in pathogenesis and drive severity of the disease with the glycemic dependence. This particular cell type could be targeted for prognostic or therapeutic purposes.
- 出版日期2017-10
