曲古抑菌素A对小鼠混合淋巴细胞培养中淋巴细胞增殖和IL-2表达的影响

Effect of trichostatin A on proliferation and interleukin-2 expression of mouse T cells in mixed lymphocyte culture

目的研究曲古抑菌素A(TSA)对小鼠体外混合淋巴细胞培养中淋巴细胞增殖及IL-2表达的影响,探讨TSA对T细胞免疫功能的影响。方法采用0.16、0.8、4、20、100、500nmol/L倍比浓度TSA作用于BALB/c及C57BL小鼠混合淋巴细胞培养体系,根据不同的OD值测定12、24、48h各浓度TSA对T淋巴细胞增殖的抑制率;相同浓度梯度TSA再作用于经丝裂霉素处理过的BALB/c淋巴细胞与C57BL淋巴细胞单向混合淋巴细胞培养体系,以环磷酰胺作对照,应用流式细胞技术观察其对IL-2表达的影响。结果TSA可以抑制小鼠混合淋巴细胞培养中T淋巴细胞的增殖,这种抑制能力表现出明显的量效及时效依赖性;TSA也显著抑制经刺激激活的小鼠T淋巴细胞的IL-2的表达,并且随着TSA浓度的升高,IL-2表达逐步下降,但与CTX比较有显著性差异(P<0.01)。结论TSA能抑制混合淋巴细胞培养中淋巴细胞的增殖,减少激活T淋巴细胞IL-2的表达,降低T细胞的免疫活性,能够减弱对外来抗原刺激的免疫应答。

Objective To investigate the effect of trichostatin A （TSA） on proliferation and interlenkin-2 （IL-2） expression of mouse T cells in mixed lymphocyte culture （MLC）, and explore its effect on T cell-mediated immune response. Methods BALB/c and C57BL mouse MLC was treated with different concentrations of TSA for different durations, and the lymphocyte inhibition ratio was measured by MTT assay. With CTX as the control, one-way MLC system of BALB/c and C57BL mouse was treated with the same concentrations of TSA, and IL-2 expression in the T cells was observed by flow cytometry. Results TSA inhibited the proliferation of T cells in the MLC in a time- and dose-dependent fashion. It also reduced the IL-2 expression in one-way MLC dose-dependently, showing it significantly differed from the effect of CTX （P〈0.01）. Conclusion Histone deacctylase inhibitor TSA can inhibit the proliferation and reduce IL-2 expression of the T cells in MLC of mice, and therefore inhibit the T cell-mediated immune rvsponse.