羊膜间充质干细胞移植改善百草枯中毒肺纤维化大鼠肺组织病理学变化

摘要

目的 探讨人羊膜间充质干细胞(hAMSCs)移植对百草枯中毒肺纤维化大鼠模型肺组织病理学变化的影响.方法 将46只SD大鼠随机分为假手术组、模型组和hAMSCs移植组.2％百草枯灌胃[100 mg/(kg·只)]制备肺纤维化模型,尾静脉移植hAMSCs[2×106个细胞/(mL·只)],HE和免疫组化染色后,显微镜下观察肺组织病理学变化.结果 与模型组比较,hAMSCs移植组大鼠一般状况较好.肉眼观发现,模型组大鼠两肺叶出现较多大面积白色纤维化病灶,hAMSCs移植组则为较少、散在的点片状病灶.显微镜下可见,模型组大鼠肺组织结构紊乱,肺泡壁增厚,有大面积间质增生和大量炎细胞浸润,而hAMSCs移植组肺组织结构明显改善,肺泡壁多为单层细胞,仅有少量、小面积间质增生,炎细胞浸润显著地减少,且有较多抗人细胞核特异性抗体阳性hAMSCs定植、存活于肺间质,少见于肺泡壁.结论 移植的hAMSCs可定植、存活于肺组织,发挥治疗百草枯中毒肺纤维化的作用.%Objective To investigate the impact of transplantation of human amniotic mesenchymal stem cells(hAMSCs)on the histopathological change in paraquat-induced pulmonary fibrosis in rats. Methods Forty-six female SD rats were randomly divided into the sham surgery group and the hAMSCs transplant group. Pulmonary fibrosis model was induced by 2％ of paraquat intragastric administration(100 mg/kg/rat). hAMSCs were injected through caudal vein(2 × 106 cells/mL/rat). The histopathological changes were observed through microscopy after HE and the immunohistochemical staining. Results General conditions in rats received hAMSCs transplantation were better than those of the model rats. More large area and white fibrosis nidus were observed in bilateral lung of model rats,with less dispersal spot or nidus. The construction of lung tissue was disordered in the model rats. The thickness of alveolar wall was found increased. There were large area interstitial hyperplasia and a large number of inflammatory cells infiltrations. The construction of lung tissue was apparently improved. A majority of alveolar wall was monolayer cell. There were only less and small area with interstitial hyperplasia. Inflammatory cell infiltration was significantly decreased. The anti-human nucleus specific antibody positive hAMSCs were observed planted and survived in lung interstitial tissue. And few hAMSCs were observed planted in alveolar wall. Conclusion The transplanted hAMSCs can be planted and survived in lung tissue ,and may play a therapeutic role in araquat-induced pulmonary fibrosis.