骨髓间充质干细胞移植对肺动脉高压大鼠肺血管重构的影响

目的 探讨骨髓间充质干细胞(MSCs)移植对野百合碱诱导的肺动脉高压(PAH)大鼠肺血管重构的影响.方法 体外分离、培养并纯化SD大鼠骨髓MSCs.健康雄性SD大鼠随机分为3组:正常对照组(n＝15)、PAH组(n＝20)和MSCs移植组(n＝20).PAH组和MSCs移植组大鼠一次性项背部皮下注射野百合碱(50 mg·kg -1),复制PAH肺血管重建动物模型.3组大鼠在同等条件下饲养.3周后,MSCs移植组大鼠经舌下静脉注射5×109 L-1的经Hoechst 33342标记的MSCs细胞悬液1 mL,PAH组大鼠予等量低糖-Dulbecco改良Eagle's培养液(L-DMEM)注射,正常对照组不做任何处理.移植28 d,观察3组大鼠肺小动脉的显微结构及超微结构的改变.结果 PAH大鼠用MSCs移植28 d后,肺小动脉管壁厚度指标(WD/TD％、VA％)、放射性肺泡计数、肺非肌性小动脉肌化程度均较PAH组显著改善(P＜0.01)；其肺小动脉的重构及超微结构的血气屏障、线粒体、板层小体等改变均有明显改善.荧光显微镜观察到Hoechst 33342标记的MSCs在肺内定植,且分化成大量新生血管并形成侧支循环,肺动脉重构得到有效逆转.结论 MSCs移植可有效减轻并逆转肺动脉重构的进程,其作用机制是MSCs分化形成新生血管,建立了侧支循环,从而修复野百合碱诱导的肺损伤.

Effect of Transplantation of Bone Marrow Mesenchymal Stem Cells on Vascular Remodeling of Pulmonary Artery in Rats with Pulmonary Arterial Hypertension

Objective To explore the effect of transplantation of bone marrow mesenchymal stem cells(MSCs)on vascular remodeling of pulmonary artery in rats with monocrotaline-induced pulmonary arterial hypertension(PAH). Methods MSCs were obtained from bone marrow of SD rats,separately,and were cultured,purified and propagated in vitro.Healthy male SD rats were randomly divided into 3 groups:normal control group(n=15),PAH group(n=20) and MSCs transplanted group(n=20).The rats in PAH group and MSCs transplanted group w...