BACKGROUND:Studies have shown that exogenous bone marrow mesenchymal stem cells can settle down in lung tissue, participate in long regeneration, but few studies concerned the repair of aging lung injury. OBJECTIVE:To observe the effect of bone marrow mesenchymal stem cells on lung injury induced by D-galactose. METHODS:A total of 30 Sprague-Dawley rats were equal y divided into three groups at random:control group, aging model group and celltreatment group. To establish the aging rats, 10 rats each in the aging model group and celltreatment group were daily subcutaneously injected with D-galactose for 4 months. 3×106 bone marrow mesenchymal stem cells were transplanted via caudal vein in the celltreatment group, once a week, for 4 weeks. cellmedium of equal dose was added in the control and aging model groups. Bone marrow mesenchymal stem cells were transfected by lentiviral vectors expressing green fluorescent protein to determine the implantation of bone marrow mesenchymal stem cells in rat lung. Superoxide dismutase activity and malondialdehyde content in rat lung were measured in each group. The difference in rat lung structure was observed using hematoxylin-eosin staining in each group. RESULTS AND CONCLUSION:Bone marrow mesenchymal stem cells marked by green fluorescent protein were implanted in rats, migrated towards lung tissue and survived. Compared with aging model group, superoxide dismutase activity was apparently increased, but malondialdehyde content was obviously diminished in the celltreatment group. In each group, histopathological sections revealed that normal pulmonary alveolus was damaged in the aging model group, showing enlarged air cavity and emphysema. Lung injury was evidently repaired inthe celltreatment group. Results suggested that bone marrow mesenchymal stem cells could repair lung injury in aging rats, and exert anti-aging effects.%背景：研究发现外源性骨髓间充质干细胞能够定居于肺脏组织，参与肺组织的再生，但其修复衰老肺损伤方面的报道较少。目的：观察骨髓间充质干细胞减轻D-半乳糖所致肺脏组织损伤的作用。方法：选择SD大鼠30只，随机分为3组，包括对照组、衰老模型组、细胞治疗组，每组10只。衰老模型组和细胞治疗组大鼠每日皮下注射D-半乳糖，连续4个月制备衰老模型。细胞治疗组通过尾静脉输注3×106个骨髓间充质干细胞，每周1次，连续4周；对照组和衰老模型组给予同等剂量的细胞培养液。采用表达绿色荧光蛋白的慢病毒载体标记骨髓间充质干细胞，以确定骨髓间充质干细胞在大鼠肺脏的植入情况。测定3组大鼠肺脏组织中超氧化物歧化酶活性和丙二醛水平；苏木精-伊红染色观察3组大鼠肺脏组织结构的差异。结果与结论：绿色荧光蛋白标记的骨髓间充质干细胞移植给大鼠后，能向肺脏组织迁移并存活。与衰老模型组相比，细胞治疗组肺脏的超氧化物歧化酶活性明显升高，丙二醛水平明显降低。各组大鼠的组织病理切片显示，模型组大鼠的正常肺泡结构破坏，出现气腔扩大、肺气肿改变；而细胞治疗组大鼠的肺脏损伤有明显修复。结果可见骨髓间充质干细胞对衰老大鼠的肺脏损伤有修复作用，从而发挥其抗衰老作用。
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