Department of Pathobiology and Gastroenterology, Cleveland Clinic, Lerner Research Institute/NE-40, 9500 Euclid Avenue, Cleveland, OH 44195, USA.
World J Gastroenterol. 2010 Mar 21;16(11):1330-6. doi: 10.3748/wjg.v16.i11.1330.
The development of alcoholic liver disease (ALD) is a complex process involving both the parenchymal and non-parenchymal cells in the liver. Enhanced inflammation in the liver during ethanol exposure is an important contributor to injury. Kupffer cells, the resident macrophages in liver, are particularly critical to the onset of ethanol-induced liver injury. Chronic ethanol exposure sensitizes Kupffer cells to activation by lipopolysaccharide via Toll-like receptor 4. This sensitization enhances production of inflammatory mediators, such as tumor necrosis factor-alpha and reactive oxygen species, that contribute to hepatocyte dysfunction, necrosis, apoptosis, and fibrosis. Impaired resolution of the inflammatory process probably also contributes to ALD. The resolution of inflammation is an active, highly coordinated response that can potentially be manipulated via therapeutic interventions to treat chronic inflammatory diseases. Recent studies have identified an adiponectin/interleukin-10/heme oxygenase-1 (HO-1) pathway that is profoundly effective in dampening the enhanced activation of innate immune responses in primary cultures of Kupffer cells, as well as in an in vivo mouse model of chronic ethanol feeding. Importantly, induction of HO-1 also reduces ethanol-induced hepatocellular apoptosis in this in vivo model. Based on these data, we hypothesize that the development of therapeutic agents to regulate HO-1 and its downstream targets could be useful in enhancing the resolution of inflammation during ALD and preventing progression of early stages of liver injury.
酒精性肝病 (ALD) 的发展是一个涉及肝脏实质细胞和非实质细胞的复杂过程。乙醇暴露时肝脏的炎症增强是导致损伤的一个重要因素。库普弗细胞是肝脏中的固有巨噬细胞,对乙醇诱导的肝损伤的发生尤为关键。慢性乙醇暴露通过 Toll 样受体 4 使库普弗细胞对脂多糖的激活敏感。这种敏化增强了炎症介质的产生,如肿瘤坏死因子-α和活性氧,这有助于肝细胞功能障碍、坏死、凋亡和纤维化。炎症过程的解决受损可能也与 ALD 有关。炎症的解决是一个积极的、高度协调的反应,可以通过治疗干预来治疗慢性炎症性疾病。最近的研究已经确定了脂联素/白细胞介素-10/血红素加氧酶-1 (HO-1) 途径,该途径在抑制原代培养的库普弗细胞中固有免疫反应的增强激活以及在慢性乙醇喂养的体内小鼠模型中非常有效。重要的是,在该体内模型中,诱导 HO-1 还减少了乙醇诱导的肝细胞凋亡。基于这些数据,我们假设开发调节 HO-1 及其下游靶标的治疗药物可能有助于增强 ALD 期间的炎症解决,并防止肝损伤早期阶段的进展。