三种成体干细胞对脂多糖诱导RAW264．7细胞炎症状态的影响

Effects of three different adult stem cells on inflammatory status of lipopolysaccharide-induced RAW264.7 cells

目的比较人羊膜上皮细胞((human amniotic epithelial cell,H-AEC))、羊膜间充质细胞(human amniotic mesenchymal cell,HA-MSC)和脐带间充质细胞(Umbilical cord mesenchymal stem cells,UC-MSC)分泌的细胞因子对脂多糖刺激巨噬细胞系RAW264.7炎症状态的影响。方法将LPS刺激的RAW264.7细胞炎症模型作为对照组,比较H-AEC、HA-MSC、UC-MSC和RAW264.7共培养或条件培养基培养RAW264.7对RAW264.7炎症状态的影响。比较各组RAW264.7细胞的迁移能力;检测各组细胞分泌一氧化氮(NO)的水平;用实时定量多聚酶链反应(RT-PCR)检测各组细胞经典激活的巨噬细胞(classically activated macrophage,M1 macrophage)相关的促炎基因如白介素-1β(IL-1β)、肿瘤坏死基因а(TNFа)、一氧化氮合成酶-2(NOS-2)以及M2 macrophage相关的抑炎基因如精氨酸酶(Arg-1)、甘露糖受体基因CD206、B类清道夫受体CD36)表达情况。结果 (1)H-AEC、HA-MSC、UC-MSC处理后RAW264.7的迁移率分别为14.7%±4.5%、9.6%±0.7%、13.0%±0.9%,与对照组(31.1%±11.0%)相比,3种细胞的条件培养基处理后RAW264.7的迁移率均降低,差异具有显著性(P<0.05);(2)H-AEC、HA-MSC、UCMSC共培养后RAW264.7细胞分泌NO的水平分别为24.26±0.72、44.52±2.51、42.25±0.76μmol/L,与对照组(45.65±1.78μmol/L)相比,H-AEC组细胞分泌的NO有显著性下降(P<0.05);(3)促炎基因与抑炎基因的表达改变:(A)H-AEC处理组促炎基因IL-1β、TNFа、NOS-2、INFβ的表达下调,与对照组相比有显著差别;HA-MSC、UC-MSC处理组促炎基因INFβ表达下调显著,其余基因均上调表达;抑炎相关基因如Arg-1、CD206、CD36均上调;(B)3组细胞干预后抑炎症相关基因Arg-1、CD206、CD36表达均上调,与对照组有显著差异。结论人羊膜上皮细胞、羊膜间充质细胞和脐带间充质细胞可以促进巨噬细胞向M2型分化,但其效果和机制存在不同。

Objective To compare the modulatory effects of human amniotic epithelial cells （H-AECs）, human amniotic mesenchymal cell （HA-MSCs）, umbilical mesenchymal ceils （UC-MSCs） on the inflammatory status of lipopolysaccharide （LPS）-induced RAW264.7 cells. Methods RAW264.7 cells stimulated with LPS were co-cultured with H-AECs, HA-MSCs, or UC-MSCs or cultured in conditioned media of the 3 stem cells to assess the changes of the inflammatory status of RAW264.7 cells. The migration ability, nitric oxide concentration, and expressions of the pro-inflammatory and anti-inflammatory genes, including intefleukin-1β （IL-1β）, tumor necrosis factor-α （TNFα）, and inducible nitric oxide synthase （NOS-2） of M1 macrophages, and Arg-1, CD206, and CD36 of M2 macrophages, were detected in the co-cultures. Results Compared with the control macrophages, RAW264.7 cells cultured in the conditioned media of H-AECs, HA-MSCs, and UC-MSCs all showed significantly lowered migration abilities （P〈0.05）. Co-culture with H-AECs, but not the other two stem cells, resulted in a significant reduction of NO production （P〈0.05） and significant down-regulation of IL-1β, TNFα, NOS-2, and INFβ expressions in RAW264.7 cells; co-culture with HA-MSCs and UC-MSCs only caused a down-regulation of INFβ mRNA expression. In all the 3 RAW264.7 and stem cell co-cultures, the expressions of the inflammation related genes including Arg-1, CD206, and CD36 were up-regulated significantly. Conclusion H-AECs, HA-MSCs, and UC-MSCs can all prevent RAW264.7 cells from differentiating into M2 macrophages, but their effects and mechanisms are different from one another.