IL-21 Receptor Signaling Is Essential for Optimal CD4(+) T Cell Function and Control of Mycobacterium tuberculosis Infection in Mice.

IL-21 Receptor Signaling Is Essential for Optimal CD4(+) T Cell Function and Control of Mycobacterium tuberculosis Infection in Mice.
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DOI:
10.4049/jimmunol.1601231
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发表时间:
2017-10-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Vankayalapati R
Vankayalapati R
中科院分区:
其他
文献类型:
--
作者:
Cheekatla SS;Tripathi D;Venkatasubramanian S;Paidipally P;Welch E;Tvinnereim AR;Nurieva R;Vankayalapati R

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在当前的研究中,我们使用 IL-21 受体敲除 (IL-21R KO) 小鼠确定了 IL-21 受体信号传导在结核分枝杆菌 (Mtb) 感染中的作用。感染 Mtb H37Rv 的 IL-21R KO 小鼠中有 50% 在六个月内死亡,而感染的野生型 (WT) 小鼠则没有死亡。与 Mtb 感染的 WT 小鼠相比,Mtb 感染的 IL-21R KO 小鼠肺部细菌负荷增加,抗原特异性 T 细胞浸润减少。与感染 Mtb 的 WT 小鼠肺部的抗原特异性 T 细胞相比,感染 Mtb 的 IL-21R KO 小鼠肺部的抗原特异性 T 细胞 T 细胞抑制性受体的表达增加,趋化因子受体的表达减少,增殖较少,产生的 IFN-γ 也较少。来自 Mtb 感染的 IL-21R KO 小鼠的 T 细胞无法诱导针对 Mtb 的最佳巨噬细胞反应。这可能是由于抗原特异性 T 细胞群减少所致。我们还发现,IL-21R 信号传导与 Mtb 感染小鼠的转录因子 Eomesodermin (Eomes) 表达减少和抗原特异性 T 细胞功能增强有关。我们的研究结果表明,IL-21 受体信号传导对于 Mtb 感染的最佳控制至关重要。
In the current study we determined the role of IL-21 receptor signaling in Mycobacterium tuberculosis (Mtb) infection, using IL-21 receptor knockout (IL-21R KO) mice. Fifty percent of Mtb H37Rv infected IL-21R KO mice died in six months compared to no deaths in infected wild type (WT) mice. Mtb infected IL-21R KO mice had enhanced bacterial burden and reduced infiltration of antigen specific T-cells in lungs compared to Mtb infected WT mice. Antigen specific T-cells from the lungs of Mtb infected IL-21R KO mice had increased expression of T-cell inhibitory receptors, reduced expression of chemokine receptors, proliferated less and produced less IFN- γ, compared to antigen specific T cells from the lungs of Mtb infected WT mice. T cells from Mtb infected IL-21R KO mice were unable to induce optimal macrophage responses to Mtb. This may be due to a decrease in the antigen specific T cell population. We also found that IL-21R signaling is associated with reduced expression of a transcriptional factor Eomesodermin (Eomes) and enhanced functional capacity of antigen specific T-cells of Mtb infected mice. The sum of our findings suggests that IL-21 receptor signaling is essential for the optimal control of Mtb infection.
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