| | | 强力霉素对移植肺缺血-再灌注损伤中细胞凋亡的研究
| | 动物医学论文 【摘要】 目的动物医学论文 探讨外源性基质金属蛋白酶(matrix metalloproteinases, MMPs)抑制剂强力霉素在移植肺缺血-再灌注损伤中细胞凋亡的动物医学论文影响。 方法 建立大鼠自体左肺肺缺血再灌注模型,16只SD受体大鼠随机分为两组:缺血再灌注组和强力霉素组,用免疫组化方法观察移植肺Bcl-2、Bax和Caspase-3表达情况,并取肺组织平滑肌细胞进行培养,采用荧光技术测定肺组织细胞凋亡。结果 肺缺血再灌注后,与对照组相比,强力霉素组移植肺Bax和Caspase-3表达明显降低(P<0.01), Bcl-2 的表达无明显变化(P>0.05),但Bcl-2/Bax比例升高;荧光图片显示,强力霉素组的细胞凋亡明显较对照组减少。结论 强力霉素可能通过下调Bax、Caspase-3表达,提高Bcl-2/Bax比例而抑制肺缺血再灌注损伤的细胞凋亡,并通过降低基底膜的降解,减轻肺水肿,达到肺保护作用。 【关键词】 肺;缺血-再灌注损伤;强力霉素 【Abstract】 Objective To investigate the effect of exogenous matrix metalloproteinase inhibitor on pneumocyte apoptosis in lung ischemia-reperfusion injury and the mechanism. Methods Models of ischemia-reperfusion lung injury in SD rats were randomly divided into two groups. The protein level expression of Bcl-2 、Bax and Caspase-3 was measured by immunohistochemistry methods after 2h transplantation. Apoptotic morphological changes were assayed with Hoechst 33258 staining and were observed under fluorescent microscope. Results The protein level expression of Bax and Caspase-3 was significantly decreased in doxycycline group than in control group (P<0.01), the expression of Bcl-2 was not significantly increased in doxycycline group, but the ratio of Bcl-2/ Bax was significantly increased in doxycycline group (P<0.01). After treatment with MMPs inhibitor, PMVECs apoptosis decreased significant. Conclusions Doxycycline can suppress apoptosis and protect lung tissue cell in the lung ischemia-reperfusion injury. 肺移植作为治疗多种终末期肺疾病的有效方法,于1983年在临床上首次获得成功。但越来越多的证据显示,供肺/移植肺仍然易于受到保存损伤(缺血)和再灌注损伤,导致移植后早期严重移植肺功能不全的发生率高达20%,移植受者术后ICU监护时间延长,术后早期死亡率增加[1],并与移植后晚期较高的闭塞性支气管炎(obliterative bronchitis,OB)发生率相关。因此,研究低温肺保存后再灌注损伤的机制,改善移植肺功能,仍然是肺移植领域中所急需解决的重点课题之一。众多研究表明,心肌细胞凋亡是肺缺血再灌注损伤的重要表现形式。细胞凋亡受多种因素的调控,尤其是凋亡调控基因Bcl-2、Bax和凋亡执行基因Caspase-3[2,3]。本研究旨在通过建立大鼠自体左肺肺缺血再灌注模型移植模型,探讨外源性基质金属蛋白酶(matrix metalloproteinases,MMPs)抑制剂强力霉素在移植肺缺血-再灌注损伤中细胞凋亡的影响。
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