Objective To investigate the effects of polysaccharide sulfate(PSS)on lipopolysaccharide(LPS)-induced mice pulmonary microvascular endothelial cell(PMVEC) injury in vitro .Methods PMVEC were divided into the blank control group (C) ,LPS stimulation group (L) and PSS+ LPS group (LP) .The effect of PSS on the viability of LPS-induced PMVEC was ob-served by MTT assay .The influence of polymorphonuclear(PMN) on the PMVEC adhesion number was measured by the rose Ben-gal staining .The concentrations of TNF-αand ICAM-1 in culture supernatant of PMVEC were detected by ELISA assay .Results PSS could inhibit the decrease of PMVEC viability caused by LPS(P=0 .001) ,compared with the group C ,the adhesion number of PMVEC and PMN in the group L was significantly increased(P=0 .000) ,the expression of TNF-αand ICAM-1 was significantly increased(P=0 .000);compared with the group L ,PSS pretreatment for 1 h could significantly decrease the LPS caused adhesion of PMVEC and PMN(P=0 .000) ,the expression of TNF-αand ICAM in the group LP was significantly decreased (P<0 .05) .Con-clusion PSS can inhibit LPS-induced PMVEC injury and adhesion of PMVEC and PMN ,its mechanism may be related with the de-crease of ICAM-1 and TNF-αexpression .%目的：研究藻酸双酯钠（PSS）对脂多糖（LPS）所致的小鼠肺微血管内皮细胞（PMVEC）损伤的保护作用。方法体外培养PMVEC ，随机将细胞分为空白对照组（C组）、LPS刺激组（L组）、PSS+ LPS组（LP组）。采用MTT 法检测 PSS对LPS刺激PMVEC的细胞活力的影响，虎红染色法测定中性粒细胞（PMN）对PMVEC黏附数量的影响，酶联免疫吸附试验（ELISA）法检测3组培养上清液中肿瘤坏死因子-α（TNF-α）和细胞间黏附分子-1（ICAM-1）的浓度。结果 PSS能抑制LPS所致的 PM-VEC细胞活力下降（P＝0.001）；与C组比较，L组的PMVEC与PMN的黏附数量明显增加（P＝0.000），TNF-α和ICAM-1的表达显著增加（P＝0.000）；与L组比较，PSS预处理1 h能显著降低 LPS所致的 PMVEC与 PMN的黏附（P＝0.000），LP组的TNF-α和ICAM-1表达显著降低（P＜0.05）。结论 PSS能抑制LPS对PMVEC的损伤及PMVEC与PMN的黏附，其作用机制可能与降低ICAM-1和TNF-α的表达有关。
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