目的：建立一种可以得到高纯度肺微血管内皮细胞的分离方法，并分别观察野生型小鼠及晚期糖基化终产物受体（RAGE）敲除小鼠细胞在脂多糖（LPS）刺激下细胞骨架F-actin变化情况。方法取6~8周龄野生型C57小鼠及RAGE基因敲除小鼠的肺，经I型胶原酶消化后，尼龙细胞筛过滤，然后采用免疫磁珠法分离原代小鼠肺微血管内皮细胞（PMVEC），经形态学及免疫荧光法鉴定后，以LPS（1 mg/L）刺激不同时间后用激光共聚焦显微镜观察细胞骨架F-actin的变化情况。结果镜下可见原代培养的PMVECs呈梭形或多角形，经细胞抗Ⅷ因子相关抗原（ⅧF-Ag）染色鉴定纯度高，LPS刺激后野生型小鼠PMVEC骨架重排，形成应力纤维，而RAGE敲除小鼠PMVEC骨架破坏不明显。结论采用免疫磁珠法可以获得高纯度的小鼠肺微血管内皮细胞，且RAGE参与了LPS介导的小鼠肺微血管内皮细胞骨架破坏。%Objective To investigate lipopolysaccharide (LPS)-induced changes of cytoskeletal filamentous actin in primary isolated pulmonary microvascular endothelial cells (PMVECs) from wild-type and RAGE knock-out mouse. Methods The lungs of wild-type and RAGE knock-out mice were digested with collagenase type I to obtain endothelial cells purified by anti-CD31-coupled magnetic beads. The PMVEC identified by factor VIII labeling were stimulated with LPS at different concentrations and the changes of filamentous actin were observed by confocal microscopy. Results The cultured primary cells showed typical endothelial cell phenotype as examined with factor VIII labeling. LPS stimulation caused rearrangement of the cytoskeletal filament F-actin in wild-type mouse PMVECs with stress fiber formation, but such changes were not obvious in RAGE knock-out mouse PMVECs. Conclusion Mouse PMVECs of a high purity can be obtained by immune magnetic beads. RAGE is involved in LPS-induced destruction of mouse PMVEC cytoskeletons.
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