摘要
目的探讨骨髓间充质干细胞(MSCs)与氧化应激状态下的肺泡上皮细胞共培养,对氧化应激水平的变化和分裂原活化蛋白激酶(MAPKs)通路的调控机制。方法分离培养大鼠MSCs,在Transwell小室中建立共培养体系,实验分3组为A549组、香烟烟雾提取物(CES)+A549组、CES十A549+MSCs共培养组。收集各组细胞和上清液,检测A549细胞凋亡率、丙二醛(MDA)、超氧化物歧化酶(SOD)的含量,c-JunN-末端激酶(JNK)、细胞外信号调节激酶(ERK)、p38蛋白激酶(p38)的表达及半胱氨酰天冬氨酸特异性蛋白酶.3(Caspase-3)的表达。结果CES+A549+MSCs组细胞凋亡率明显低于CES+A549组[(11.01±0.23)比(18.12±1.43),(P〈0.01)]。CES+A549+MSCs组MDA较CES+A549组明显降低[(0.512±0.132)比(1.450±0.073),(P〈0.01)1,而SOD明显增高[(12.224-0.12)比(7.21±0.31),(P〈0.01)]。A549+CSE+MSCs组P-p38、P—JNK、Caspase-3的表达明显低于A549+CSE组,分别为(1.55±0.13)比(3.41±0.01)、(3.24±0.21)比(7.22±0.25)、(2.29±0.15)比(5.27±0.17),P〈0.05,而P—ERK的表达明显增高[(1.21±0.03)比(0.22±0.02),P〈0.05]。结论MSCs可以通过抑制p-p38、p-JNK的表达,提高p-ERK的表达而降低氧化应激下的细胞凋亡,从而对细胞起保护作用。
Objective To explore the modulatory effects of bone marrow mesenchymal stem cells (MSCs) on changes in oxidative stress and mitogen-activated protein kinases (MAPKs) pathway by co-culturing of bone marrow MSCs with alveolar epithelial cells under oxidative stress. Methods MSCs in rats were separated and cultured, the the co-culture system was established in Transwell small chamber. Three groups were designed : A549 group, CES + A549 group, and CES + A549 + MSCs group. The cells and the supernatant in three groups were harvested for detection of apoptosis rate of A549 epithelial cells, the con- tents of malondialdehyde (MDA) and superoxide dismutase (SOD), and the expression of p-C-Jun N-ter- minal kinase (p-JNK), p-extracellular signal-regulated kinase (p-ERK) , p-p38 and Caspase-3. Results The apoptosis rate in CES + A549 + MSCs group was significantly lower than in CES + A549 group [ ( 11. 01 ±0. 23) vs. ( 18. 12±1.43), (P 〈0. 01 ). The MDA content in CES + A549 + MSCs group was reduced significantly as compared with CES + A549 group [ (0. 512 ± 0. 132) vs. (1. 450 ±0. 073 ), (P 〈 0. 01 ) ], and the SOD content was higher than in CES + A549 group [ ( 12. 22± 0. 12) vs. (7.21 ± 0. 31 ), (P 〈 0. 01 ) ]. The expression of p-p38, p-JNK and Caspase-3 in A549 + CSE + MSCs group was significantly lower than in A549 + CSE group [ p-p38 : ( 1.55±0. 13 ) vs. ( 3.41± 0. O1 ) ; p-JNK : ( 3.24 ±0. 21 ) vs. (7.22 ± 0. 25 ) ; Caspase-3 : [ ( 2. 29±0. 15 ) vs. (5.27 ± 0. 17 ), P 〈 0. 05 ], and the expression of p-ERK was significantly higher than in 3.549 + CSE group [ ( 1.21 ± 0. 03 ) vs. (0. 22 ± 0. 02), P 〈 0. 05 ]. Conclusion MSCs can exert the protective effects on alveolar epithelial cells under oxidative stress by reducing apoptosis through inhibiting the expression of p-p38 and p-JNK, and increasing the expression of p-ERK.
出处
《中华实验外科杂志》
CAS
CSCD
北大核心
2012年第9期1796-1798,共3页
Chinese Journal of Experimental Surgery
基金
河南省医学科技重大攻关计划资助项目(200902012):河南省科技攻关计划资助项目(102300410247)
关键词
骨髓间充质干细胞
氧化应激
脱噬作用
Bone marrow mesenchymal stem cells
Oxidative stress
Apoptosis