AIM:To explore the mechanism of altered tumor necrosis factor-alpha (TNF-alpha) expression by peritoneal macrophages (PMPhi) and Panax notoginseng saponins (PNS) modulation in light of NF-kappaB signal transduction in severely scalded mice. METHODS:Eighteen percent total body surface area (TBSA) full-thickness scalded mice were used. PMPhi was collected at different time intervals (0, 2, 6, 12, 24 and 48 post-burn hour (PBH)) separately. The following parameters were measured: TNF-alpha mRNA and IL-10 mRNA expression (reverse transcription-polymerase chain reaction, RT-PCR), protein kinase C (PKC) activity (isotope incorporation analysis), NF-kappaB activity (electrophoretic mobility shift assay, EMSA), IkappaB-alpha expression (Western blot). RESULTS:After scald, increased expression of TNF-alpha mRNA of PMPhi peaked at 12 PBH. Meanwhile, expression of IL-10 mRNA dropped to the lowest level at 12 PBH. NF-kappaB activity was markedly activated and reached its peak at 2 PBH. Membrane PKC activity was up-regulated after scald and showed a positive correlation with the change of TNF-alpha mRNA. Expression of IkappaB-alpha first decreased at 2 PBH and then increased to high level at 24 PBH. When 12 PBH was chosen as the time point for in vitro intervention with the application of specific NF-kappaB inhibitor pyrrolidine dithiocarbamate (PDTC), PKC inhibitor H-7 and PNS, both TNF-alpha mRNA expression and NF-kappaB activity decreased significantly. CONCLUSIONS:These results indicate that abnormal expression of TNF-alpha mRNA of macrophages might be regulated by PKC-NF-kappaB signaling following severe burn. PNS might play an anti-inflammatory effect by inhibiting NF-kappaB activity and TNF-alpha mRNA expression.

译文

目的:探讨严重烫伤小鼠的腹膜巨噬细胞(PMPhi)和三七总皂苷(PNS)调节改变肿瘤坏死因子-α(TNF-α)表达的机制。
方法:使用百分之十八的全身表面积(TBSA)全层烫伤小鼠。在不同的时间间隔(燃烧后小时(PBH)分别为0、2、6、12、24和48)收集PMPhi。测量以下参数:TNF-αmRNA和IL-10 mRNA表达(逆转录-聚合酶链反应,RT-PCR),蛋白激酶C(PKC)活性(同位素掺入分析),NF-κB活性(电泳迁移率变化)分析,EMSA),IkappaB-alpha表达(蛋白质印迹)。
结果:烫伤后,PMPhi的TNF-αmRNA表达增加,在12 PBH时达到峰值。同时,IL-10 mRNA的表达在12 PBH时降至最低水平。 NF-κB活性被明显激活,并在2 PBH达到峰值。结垢后膜PKC活性上调,并与TNF-αmRNA的变化呈正相关。 IkappaB-α的表达首先在2 PBH时降低,然后在24 PBH时升高至高水平。当12 PBH在体外干预选择作为时间点与特定NF-κB的抑制剂吡咯烷二硫代氨基甲酸的应用(PDTC),PKC抑制剂H-7和PNS,二者的TNF-αmRNA的表达和NF-κB活性显著降低。
结论:这些结果表明,严重烧伤后巨噬细胞TNF-αmRNA的异常表达可能受到PKC-NF-κB信号传导的调节。 PNS可能通过抑制NF-κB活性和TNF-αmRNA表达发挥抗炎作用。

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