摘要目的:探讨人骨髓间充质干细胞（MSC）对人气道上皮细胞激素抵抗的影响。方法:通过卵清白蛋白（OVA）/脂多糖（LPS）在BEAS-2B细胞上构建激素抵抗模型，将人骨髓MSC与BEAS-2B细胞进行共培养。分为空白组、模型组、激素组、间充质干细胞组（MSC组）、间充质干细胞+激素组（MSC+bud组）。ELISA法检测细胞上清液IL-8表达；流式细胞术检测细胞内活性氧（ROS）表达；Western blot检测组蛋白去乙酰化酶2（HDAC2）、糖皮质激素受体α（GRα）蛋白表达；RT-PCR检测GRα、HDAC2 mRNA表达。结果:MSC组IL-8的表达水平（31.7±0.7）明显低于激素组（49.8±3.6），差异有统计学意义（ P<0.01）；MSC组ROS的表达水平（2754±154）明显低于激素组（4624±228），差异有统计学意义（ P<0.05）；MSC组HDAC2 mRNA的表达水平（1.749±0.005）明显高于激素组（1.283±0.098），差异有统计学意义（ P<0.05）；MSC组GRα mRNA的表达水平（1.623±0.079）明显高于激素组（1.047±0.220），差异有统计学意义（ P<0.01）；MSC组HDAC2蛋白的表达水平（1.067±0.100）明显高于激素组（0.620±0.083），差异有统计学意义（ P<0.01）；MSC组GRα蛋白的表达水平（0.834±0.053）明显高于激素组（0.579±0.017），差异有统计学意义（ P<0.01）；ROS与IL-8表达呈正相关（ r=0.796， P<0.01），与HDAC2和GRα mRNA表达呈负相关（ r=-0.893 3， P<0.01； r=0.931 4， P<0.01）；与HDAC2和GRα蛋白表达呈负相关（ r=-0.929 5， P<0.01； r=-0.864 3， P<0.01）。 结论:人骨髓MSC可通过外分泌的方式改善BEAS-2B细胞的激素抵抗，其机制可能与降低细胞内ROS表达，提高HDAC2表达，进而提高GRα表达有关；MSC还可通过降低IL-8表达，从而改善激素抵抗。

abstractsObjective:To explore the effect of human bone marrow mesenchymal stem cells(MSC) on the steroid resistance of human airway epithelial cells.Methods:Ovalbumin (OVA)/lipopolysaccharide (LPS) were used to construct steroid resistant BEAS-2B cells, which were then co-cultured with MSC. Groups were set as follows: blank group, model group, Glucocorticoid group, MSC group, MSC+Glucocorticoid group (MSC+bud group). The expression of interleukin (IL)-8 in the cell supernatant was detected by enzyme-linked immunosorbent assay (ELISA); the expression of reactive oxygen species (ROS) in the cells was detected by flow cytometry; the expression of glucocorticoid receptor α (GRα) and histone deacetylase 2 (HDAC2) protein in the cell was detected by Western blotting; and the expression of GRα and HDAC2 mRNA was detected by reverse transcription-polymerase chain reaction (RTPCR).Results:The expression level of IL-8 in the MSC group was significantly lower than that in the Glucocorticoid group (31.7±0.7 vs. 49.8±3.6, P<0.01). The expression of ROS in the MSC group was significantly lower than that in the Glucocorticoid group (2754±154 vs.4624±228, P<0.05). The expression level of HDAC2 mRNA in the MSC group was significantly higher than that in the Glucocorticoid group(1.749±0.005 vs. 1.283±0.098, P<0.05). The expression level of GRα mRNA in the MSC group was significantly higher than that in the Glucocorticoid group (1.623±0.079 vs.1.047±0.220, P<0.01). The expression of HDAC2 protein in the MSC group was significantly higher than that in the Glucocorticoid group (1.067±0.100 vs. 0.620±0.083, P<0.01). The expression of GRα protein in the MSC group was significantly higher than that in the Glucocorticoid group (0.834±0.053 vs. 0.579±0.017, P<0.01). ROS was positively correlated with the IL-8 expression ( r=0.796, P<0.01) and negatively correlated with the HDAC2 and GRα mRNA expression ( r=-0.893 3, P<0.01; r=0.931 4, P<0.01, respectively), as well as the HDAC2 and GRα Protein expression ( r=-0.929 5, P<0.01; r=-0.864 3, P<0.01, respectively). Conclusions:Human MSC can improve steroid resistance of airway epithelial cells in an exocrine manner. The mechanism may be related to the down-regulation of ROS and up-regulation of HDAC2, which lead to GRα overexpression. In addition, MSC may improve the steroid resistance by reducing the expression of IL-8.