摘要
重症急性胰腺炎(SAP)是指因胰酶异常激活对胰腺自身及周围器官产生消化作用而引起的、以胰腺局部炎性反应为主要特征,甚至可导致器官功能障碍的临床常见急腹症。SAP常并发急性肺损伤(ALI)和急性呼吸窘迫综合征(ARDS),是目前导致SAP病死率较高的主要原因之一。SAP相关ALI的发生率从15%~55%不等,其临床表现也从轻度低氧血症到ARDS各有不同。并且,ALI和ARDS是SAP腹外功能障碍最显著的表现,发病第1周病死率高达60%。近年来众多研究发现,一方面,SAP相关ALI与多种信号通路的激活密不可分;另一方面,各种炎症因子的刺激、氧化应激、细胞焦亡等也是导致SAP相关ALI的重要原因。笔者就有关SAP相关ALI的机制及治疗的最新研究进展作一综述。
关键词
重症急性胰腺炎(severe acute pancreatitis,SAP)是一种极为危险的临床急腹症,可引起全身炎症反应,并迅速累及全身多个器官。急性肺损伤(acute lung injury,ALI)是SAP中最常出现的并发症,也是SAP最严重的并发症之一,且病死率超过30%,尤其老年患者病死率较高,是早期SAP患者死亡的主要原因之
MAPK是一种由多种同工酶组成的丝氨酸/苏氨酸蛋白激酶,包括细胞外信号调节激酶(extracellular signal-regulated kinase,ERK)、P38MARK和氨基末端激酶(c-Jun N-terminal kinase,JNK),是丝氨酸/苏氨酸激酶家族的重要组成部分,已被证明在炎症、肿瘤发生、细胞增殖、凋亡、分化和应激反应中发挥重要作
作为最重要的生理性脂氧素之一,lipoxin A4是炎症反应开始时由花生四烯酸产生的内源性抗炎分子家族的成员,已在越来越多的炎症相关疾病模型中得到广泛研究;研
此通路之前已被证明在肿瘤发生中发挥作用,肿瘤相关淋巴分泌的配体趋化因子配体21(CCL21)可与口腔鳞状细胞癌(oral squamous cell carcinoma,OSCC)细胞的C-C驱化因子受体7(CCR7)相互作用,从而诱导上皮-间充质转化(EMT),促进肿瘤细胞的干细胞性激活JAK2/STAT3信号通
NLRP3是一种结点样受体,是炎症的关键组织损伤激活剂,可以被不同的损伤相关分子模式(DAMPs)激活,如活性氧类物质(ROS)、线粒体DNA(mtDNA)、三磷酸腺苷,从而产生IL-6、TNF-α等炎症因子;而NF-κB信号通路作为转录因子核因子,启动过程中Toll样受体识别危险相关的分子模式或病原体相关的分子模式,从而激活NF-κB、诱导IL-1β和增加NLRP3的合成。作为经典的促炎途径,具有传统的作用模式,而且由于在NLRP3激活的初始步骤中的关键作用;NLRP3和NF-κB通路都是引起细胞损伤的促炎通路;有证据表明大黄素、地塞米松可能通过抑制NLRP3炎性小体介导的中性粒细胞募集和减弱NF-κB信号通路的激活,从而达到抑制SAP相关ALI的作
有研究表明核因子E2相关因子2(Nrf2)是一种氧化还原敏感的转录因子,可以通过转运到细胞核诱导抗氧化应激酶HO-1的表达,已有多项研
目前认为焦亡是一种程序性细胞坏死,其特征是细胞肿胀、破裂,并释放促炎内容物;焦亡包括caspase-1依赖的经典炎性小体途径和caspase-4/5/11依赖的非经典炎性小体途径。近年来,caspase-1依赖的经典炎性小体受到广泛关注;已有研究证明,在肝损伤与肝纤维化中,NLRP3炎性小体激活后,小鼠和人的原发性肝细胞可发生焦死,随后释放NLRP3炎性小体蛋白,放大和延续炎性小体驱动的纤维化;另外,Gaul
SAP相关ALI在临床上被认为是一个复杂且棘手的临床疾病,在过去的几十年里,有大量动物实验证明,SAP可导致ALI中各种信号通路的持续激活,通过抑制相关信号通路,可以减少促炎因子的分泌,减轻肺损伤,达到一定的治疗效果。近10年来,如间充质干细胞(MSCs)、腹腔穿刺引流(APD)、腹腔灌洗等治疗SAP及SAP相关ALI的方式也开始被陆续报道。然而,准确有效的靶向抑制剂的发现仍依赖于通路中涉及的基因和蛋白质的研究,而炎症疾病的诊断基因和蛋白质组学的研究目前仍处于初级阶段。在今后的研究中,需要注重分析各种蛋白质、基因及信号通路之间的相互作用,以此加深对SAP相关ALI的机制的理解,望能早日为有效诊断和治疗提供实验依据。
利益冲突
所有作者均声明不存在利益冲突。
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