Abstract

目的探讨组蛋白去乙酰化酶(HDAC)抑制剂Belinostat对小鼠骨髓来源树突状细胞(DC)免疫功能的影响及初步机制。方法体外诱导培养C57BL/6小鼠骨髓来源的DC,诱导培养第5天为未成熟DC(imDC)组,设0、50、100 nmol/L Belinostat作用组;imDC以脂多糖作用24 h为成熟DC(mDC),设0、50、100 nmol/L Belinostat作用组。从细胞形态、超微结构、免疫表型进行鉴定。流式细胞术检测各组DC免疫表型及趋化因子受体CCR7表达水平,趋化实验检测DC的体外迁移率。单向混合淋巴细胞培养法检测各组DC刺激下异基因淋巴细胞增殖率。ELISA法检测各组DC培养上清中TNF-α、IL-12及IL-10的表达水平。RQ-PCR检测Belinostat对DC中RelB mRNA表达水平的影响。结果成功诱导培养出imDC及mDC并鉴定。50和100 nmol/L Belinostat+imDC组CCR7表达水平均低于imDC组[(25.82±7.25)%对(50.44±5.61)%、(18.71±2.00)%对(50.44±5.61)%];50 nmol/L Belinostat+mDC组CCR7表达水平高于mDC组[(71.14±1.96)%对(64.90±1.47)%]。Belinostat作用下imDC和mDC的迁移率均下降,但在imDC中组间比较差异无统计学意义。当刺激细胞∶反应细胞比例为1∶2时,100 nmol/L Belinostat+imDC刺激下淋巴细胞增殖率低于imDC组[(227.09±13.49)%对(309.49±53.69)%]。Belinostat作用下mDC所分泌的TNF-α、IL-12和IL-10较mDC组均明显下降,差异均有统计学意义(P值均<0.01)。Belinostat+imDC及Belinostat+mDC中RelB mRNA表达水平较imDC组及mDC组均有降低(P值均<0.05)。结论Belinostat可调节DC迁移、抑制T淋巴细胞增殖及细胞因子分泌,一定程度上抑制DC成熟,可能与其下调DC中NF-κB的转录因子RelB mRNA水平有关。

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