人参二醇组皂苷对LPS致休克大鼠肝脏TLR2、TLR9 mRNA表达的影响

目的：观察人参二醇组皂苷(PDS)对TLR2和TLR9 mRNA表达的影响,探讨PDS抗休克的分子生物学机制。方法:大鼠随机分为对照(control)组、LPS休克(LPS)组、人参二醇组皂苷小剂量(LPS+PDSL)组和人参二醇组皂苷中剂量(LPS+PDSM)组。大鼠舌下静脉注射LPS(4 mg/kg)4 h后测定血清中NOS活性、NO含量，肝组织中LPO含量、SOD活性以及TLR2、TLR4 mRNA的表达。结果:LPS+PDSL组和LPS+PDSM组NOS活性、NO含量和LPO含量明显低于LPS组，SOD活性明显高于LPS组(P<0.05)；LPS+PDSL组和LPS+PDSM组TLR2 mRNA表达明显低于LPS组，TLR9 mRNA表达无变化。结论:PDS通过下调肝组织中TLR2 mRNA表达，降低NOS活性、NO含量，对肝脏有保护作用。

Effects of panaxadiol saponin on TLR2 and TLR9 mRNA expression in LPS induced shock rats

AIM: To explore the molecular mechanism of panaxadiol saponin (PDS) by observing Toll like receptor (TLR) 2 and TLR9 mRNA expression induced by lipopolysaccharide (LPS).METHODS: Rats were divided into LPS, LPS+PDSL, LPS+PDSM and control group, respectively. Nitric oxide synthase (NOS) activity, nitric oxide (NO) content, LPO content, SOD activity and TLR2 and TLR9 mRNA expression were assayed 4 h after intravenous injection of LPS. RESULTS: NOS activity, NO content, LPO content of LPS+PDSL group and LPS+PDSM group were significantly lower than those in LPS group. TLR2 mRNA expression in the liver tissue of LPS+PDSL group and LPS+PDSM group was decreased compared with LPS group.CONCLUSION: PDS has a protective effect on liver tissues by triggering the down-regulation of TLR2 expression, reducing NOS activity, and NO content.