摘要:
目的 初步探索细辛脑对哮喘小鼠转化生长因子-β1(TGF-β1)、血管内皮生长因子(VEGF)表达方面干预的影响,为细辛脑临床治疗哮喘提供理论指导.方法 将30只BALB/C雌性小鼠按随机数字表法分为哮喘组、细辛脑组和对照组,每组各10只.哮喘组和细辛脑组采用鸡卵白蛋白(OVA)诱导建立哮喘模型,对照组采用生理盐水替代,细辛脑组额外给予细辛脑雾化吸入干预.苏木素-伊红染色观察3组小鼠的肺组织病理变化,ELISA法检测3组小鼠肺泡灌洗液(BALF)中TGF-β1及VEGF水平,显微镜下对BALF沉淀物进行细胞计数和分类.结果 与对照组小鼠相比,哮喘组小鼠肺组织有明显的气道周围炎症细胞浸润,气管管壁增厚和狭窄,细辛脑组小鼠也有前述哮喘组的病理特点,但程度轻于哮喘组.细辛脑组BALF中TGF-β1和VEGF水平均高于对照组、低于哮喘组(P均<0.01).哮喘组的细胞总数及中性粒细胞、嗜酸性粒细胞、淋巴细胞、巨噬细胞计数均多于细辛脑组和对照组(P均<0.05),细辛脑组的中性粒细胞、嗜酸性粒细胞计数均多于对照组(P均<0.01).结论 TGF-β1和VEGF在哮喘小鼠BALF中表达,并可能参与哮喘早期气道重塑,细辛脑可降低哮喘小鼠TGF-β1和VEGF的水平,可能是其改善哮喘气道炎症和缓解气道重塑的机制之一.%Objective To primarily investigate the intervention effect of asarone upon the expression levels of transforming growth factor-β1 (TGF-β1) and vascular endothelial growth factor (VEGF) in asthmatic mice,aiming to provide theoretical guidance for asarone in the treatment of asthma in clinical practice.Methods Thirty female BALB/C mice were randomly divided into three groups using the random number table:the asthma,asarone and control groups (n =10 for each group).In the asthma and asarone groups,the mouse models with asthma were established by ovalbumin (OVA) induction,and physiological saline was utilized in the control group.The mouse in asarone group additionally received aerosol inhalation of asarone.The pathological changes of the lung tissues were observed by H.E.staining.The expression levels of TGF-β1 and VEGF in the bronchoalveolar lavage fluid (BALF) were quantitatively measured by ELISA.The cell counting and classification in the BALF deposit were performed under microscope.Results Compared with the control group,more evident inflammatory cellular infiltration surrounding the airway,bronchial wall thickening and stenosis were noted in the asthma and asarone groups.The degree of these symptoms in the asthma group was more severe than that in the asarone group.In the asarone group,the expression levels of TGF-β1 and VEGF in the BALF were significantly down-regulated than those in the asthma group,whereas considerably up-regulated compared with those in the control group (all P < 0.01).In the asthma group,the total cell count and the quantity of neutrophils,eosinophils,lymphocytes and macrophages were significantly higher compared with those in the control and asarone groups (all P < 0.05).The quantity of neutrophils and eosinophils in the asarone group was evidently higher than that in the control group (both P < 0.01).Conclusions Both TGF-β1 and VEGF are over-expressed in the BALF of mouse models with asthma mice and they probably participate in the airway remodeling during the early stage of asthma.Asarone can down-regulate the expression levels of TGF-β1 and VEGF in asthmatic mice,which possibly acts as one of the mechanism underlying mitigating airway inflammation and easing airway remodeling.