Regulation of transforming growth factor-beta 1 on expression of tumor necrosis factor alpha and interleukin 1 beta in rats following lung ischemia-reperfusion injury / 中国组织工程研究

ABSTRACT

BACKGROUND:When leucocytes were activated in the process of lung ischemia-reperfusion,various cell factors will be released,including tumor necrosis factor ?(TNF-?) and interleukin 1?(IL-1?),which lead to ischemia-reperfusion injury.Recent research demonstrates that transforming growth factor-?1 plays a protective role in ischemia-reperfusion injury after lung transplantation OBJECTIVE:To investigate the level changes of TNF-? and IL-1?after interfered with transforming growth factor-?1 after lung ischemic-reperfusion injury DESIGN,TIME AND SETTING:The randomized controlled experiment of animal was performed in the Cardiothoracic Surgery Laboratory of Changhai Hospital,Second Military Medical University of Chinese PLA from August to October 2007.MATERIALSThirty Sprague-Dawley rats with clean grade,were randomly divided into the sham operation,ischemia-reperfusion and transforming growth factor?1 groups,with 10 animal in each group.The transforming growth factor?1 was phuchased from Peprotech INC.METHODS:The left lung of rat in the ischemia-reperfusion and transforming growth factor?1 groups was prepared for to ischemia-reperfusion model by blocking pulmonary circulation with hilar vessels ligation for 60 minutes,followed by reperfusion for 2 hours.Animals in the sham operation group were crossed hilar with 10# silk thread.Heparin was administered intravenously through vena cervicalis at 15 minutes before ischemia in each group.Concurrently,10 ?g/kg transforming growth factor?1 was administered in transforming growth factor?1 group.MAIN OUTCOME MEASURES:After 2 hours of ischemia-reperfusion,the tissues of left lung were removed,histomorphological changes,wet-dry weight ratio,the index of histological lung injury and the content of TNF-?and IL-1?were determined by light microscope,enzyme-linked immunosorbent assay(ELISA),respectively.RESULTS:A total of 30 animals were enrolled in the result analysis.There was no obvious pathological change of lung in the sham operation group.Visible tissue edema and neutrophil infiltration could be found in the ischemia-reperfusion group,while,there was mild tissue edema and little neutrophil infiltration in the transforming growth factor?1 group.The wet-dry weight ratio and index of histological lung injury in the ischemia-reperfusion group was obvious greater than that of the sham operation group(P