维生素C对脱氧雪腐镰刀菌烯醇诱导的单个核细胞凋亡及增殖抑制作用的影响

目的探讨维生素 C(vitamin C,VC)预处理对脱氧雪腐镰刀菌烯醇(deoxynivalenol,DON)诱导的人外周血单个核细胞(human peripheral blood mononuclear cells,HPBMC)凋亡及其相关基因表达和增殖抑制作用的影响。方法采用流式细胞术(flow cytometry,FCM)和蛋白印迹(Western blotting)方法研究不同剂量 VC 预处理后,DON 对 HPBMC 凋亡及相关基因 Bcl-2、Bax、Caspase-3蛋白表达影响的变化,同时观察 VC 预处理对 DON 引起的增殖抑制作用的影响。结果FCM 检测结果表明,终浓度为2000μg/L 的 DON 可诱导体外培养的 HPBMC 凋亡,其凋亡率为(28.82±1.67)%,25μmol/L VC 预处理可明显抑制 DON 诱导的体外培养 HPBMC 凋亡(22.39±1.05)%,P<0.05,而100μmol/L VC 预处理则可明显增高 DON 诱导的 HPBMC 凋亡(36.07±2.92)%,P<0.05。Western blotting 分析结果表明,25μmol/L VC 预处理可明显降低 DON 诱导的HPBMC Bax 和 caspase-3蛋白高表达,同时使 DON 抑制的 Bcl-2蛋白表达明显升高。100μmol/L VC预处理可明显促进 DON 诱导的 Bax 和 Caspase-3蛋白的高表达,但对 DON 抑制的 Bcl-2表达无明显影响。不同剂量 VC(25μmol/L 和100μmol/L)预处理均可降低 DON 对 HPBMC 增殖的抑制作用(P<0.05),但不同剂量 VC 之间没有显著差异。结论 25μmol/L VC 预处理可一定程度地抑制DON 诱导的 HPBMC 亡及凋亡相关基因的异常表达,而100μmol/L VC 则促进 DON 诱导的HPBMC 凋亡。不同剂量 VC 预处理可以明显降低 DON 对 HPBMC 的增殖抑制作用。

Effects of vitamin C on apoptosis and proliferation inhibition of human peripheral blood mononuclear cells induced by deoxynivalenol in vitro

OBJECTIVE: To explore the effects of Vitamin C (Vit C) on the apoptosis and proliferation inhibition of human peripheral blood mononuclear cells (HPBMCs) induced by deoxynivalenol (DON) in vitro. METHODS: The effects of Vit C pretreatment at different dosages (25 micromol/L and 100 micromol/L) on apoptosis, apoptosis related genes expression and proliferation inhibition of HPBMCs induced by DON were evaluated with cell culture, flow cytometric DNA analysis and Western blotting. RESULTS: Flow cytometry (FCM) analysis showed that the apoptosis rate of HPBMCs in 2000 microg/L DON group was (28.82 +/- 1.67)%, which was significantly higher than that in control group (14.07 +/- 0.70, P < 0.05). Compared with DON group, the apoptosis rate of HPBMCs in 25 micromol/L Vit C pretreatment group was significantly decreased (28.82 +/- 1.67)% vs (22.39 +/- 1.05)%, P < 0.05, while that in 100 micromol/L Vit C pretreatment group was obviously increased (36.07 +/- 2.92)%, P < 0.05. Western blotting analysis showed that the expression of Bax and Caspase-3 up-regulated by DON was markedly decreased, while the expression of Bcl-2 down-regulated by DON was increased by 25 micromol/L Vit C pretreatment (P < 0.05). 100 micromol/L Vit C pretreatment could further increase the expression of Bax and Caspase-3 of HPBMCs induced by DON, while no significant effects on the Bcl-2 expression induced by DON were seen. FCM analysis showed that the proliferation index of HPBMCs in Vit C pretreatment groups at different dosages was all dramatically increased as compared with that in DON groups (P < 0.05). CONCLUSION: 25 micromol/L Vit C pretreatment could at certain extent inhibit the apoptosis and reverse the abnormal expression of apoptosis related genes of HPBMCs induced by DON in vitro, while 100 micromol/L Vit C pretreatment could further increase the apoptosis rate of HPBMCs induced by DON. Vit C pretreatment could reverse the proliferation inhibition of HPBMCs induced by DON in vitro.