杂色曲霉素对体外培养HPBMcIFN-γ分泌的影响

Effects of sterigmatocystin on interferon-γ secretion of human peripheral blood mononuclear cells in vitro

目的 :探讨杂色曲霉素 (ST)对人T淋巴细胞分泌功能的影响。方法 :采用双抗体夹心ELISA方法对ST作用后人外周血单核细胞 (HPBMc)培养上清液中γ -干扰素 (IFN -γ)的分泌水平进行检测。结果 :不同浓度ST对IFN -γ分泌的影响不同 ,较低浓度ST 0 0 3 12 5mg/L - 0 12 5 0 0mg/L对IFN -γ的分泌有一定抑制作用 (P <0 0 5 ) ,而在 0 2 5mg/L以上浓度ST可刺激IFN -γ分泌 ,至 1mg/L达到高峰 (P <0 0 5 )。在 0 2 5mg/L - 1 0 0mg/L的浓度范围内 ,ST浓度和IFN -γ分泌呈正相关 (r=0 4 92 ,P <0 0 1) ;在ST 1mg/L作用 1h - 64h的时间范围内 ,ST对IFN-γ分泌的影响依时间不同作用也不同 ,在 4h - 8hIFN -γ的分泌降低 ( 8h ,P <0 0 5 ) ,而以后各组随着ST作用时间的延长IFN -γ水平逐渐增高 ,尤以 3 2h组增高最为明显 (P <0 0 5 ) ,在ST作用 16h - 64h的时间范围内 ,IFN -γ的分泌随着ST作用时间的延长而逐渐增加 ,两者呈正相关 (r=0 73 6,P <0 0 1)。结论 :ST对HPBMcIFN -γ分泌的影响表现在较低浓度和较短时间抑制IFN -γ分泌 ,而较高浓度和较长时间则诱导IFN -γ分泌 ,但继续增加ST浓度和作用时间并不继续增加IFN -γ分泌。

AIM: To explore the putative effects of sterigmatocystin (ST) on human help T lymphocyte(Th1)function. METHODS: The effects of ST on interferon-γ(IFN-γ)secretion of human peripheral blood mononuclear cells(HPBMc) in vitro were determined with ELISA method. RESULTS: The effects of ST on IFN-γ secretion of HPBMc in vitro were closely dependent on ST concentrations. ST at relatively lower concentrations (0.03125-0.12500 mg/L) showed inhibiting effects on IFN-γ secretion. While, stimulating effects could be found when ST concentration was above 0.25mg/L. The highest level was seen in ST 1 mg/L group ( P< 0.05)?At concentration ranging from 0.25 mg/L to 1 mg/L, a positive dose- effects correlation was found between ST concentration and IFN-γ secretion ( r =0.492, P< 0.01). Time-effects analysis from 1 h to 64 h after ST treatment (1 mg/L)showed that the effects of ST on IFN-γ secretion varied as the changes of treatment times. An inhibiting effect on IFN-γ secretion of HPBMc 4 h and 8 h after ST treatment was found (8 h, P< 0.05). As the treatment time prolonged from 16 h, IFN-γ level gradually increased (32 h, P <0.05). There was a positive correlation between treatment time of ST and IFN-γ level of HPBMc in vitro from 16 h to 64 h after ST treatment ( r =0.736, P< 0.01). CONCLUSION:The effects of ST on IFN-γ secretion of HPBMc in vitro closely depended on concentration and treatment time of ST. Generally, inhibiting effects were found at relatively lower ST concentration and shorter treatment period, while stimulation effects could be seen at relatively higher ST concentration and longer ST treatment time period.