Molecular and Cellular Biochemistry Program, Department of Surgery, Loyola University, Medical Center, Maywood, Illinois 60153, USA.
Shock. 2013 Apr;39(4):373-9. doi: 10.1097/SHK.0b013e318289d6c6.
Interleukin 6 (IL-6) is an inflammatory cytokine known to be elevated in chronic diseases and after insults such as trauma and infection. Although necessary for the development of B cells and Th17 cells, IL-6, at elevated levels, can also cause tissue damage and lead to a rise in inflammation. Previous work in our laboratory has shown that IL-6 is increased both systemically and in multiple organ systems including the ileum after ethanol exposure and burn injury. As this combined insult causes elevated intestinal morphological damage, tight junction protein localization alterations, and phosphorylated myosin light chain levels, we sought to determine the role of IL-6 in these intestinal responses using a model of binge ethanol exposure and burn injury. Interleukin 6 antibody treatment after the combined insult reduced morphological changes in the ileum, bacterial translocation, and phosphorylated myosin light chain levels relative to either injury alone. Zonula occludens protein 1 and occludin localization was also reestablished in wild-type mice given IL-6 antibody after ethanol and burn. Interleukin 6-knockout mice given ethanol and burn injury also had reduced intestinal damage; however, no changes in bacterial translocation or tight junction protein localization were observed as compared with similarly treated wild-type mice. These data suggest that IL-6 may have a role in intestinal tissue damage observed after the combined insult of binge ethanol exposure and burn injury, although complete loss of IL-6 does not seem to be beneficial in this model. Modulation of IL-6 may present a new option for preventing intestinal damage and associated inflammation after a combined insult of ethanol exposure and burn injury.
白细胞介素 6(IL-6)是一种已知在慢性疾病和创伤及感染等损伤后升高的炎症细胞因子。虽然 IL-6 对于 B 细胞和 Th17 细胞的发育是必需的,但在高水平时,它也会导致组织损伤并导致炎症增加。我们实验室之前的工作表明,乙醇暴露和烧伤损伤后,IL-6 在全身和多个器官系统(包括回肠)中均升高。由于这种联合损伤会导致肠道形态学损伤增加、紧密连接蛋白定位改变和磷酸化肌球蛋白轻链水平升高,我们试图通过 binge 乙醇暴露和烧伤损伤模型来确定 IL-6 在这些肠道反应中的作用。联合损伤后给予 IL-6 抗体治疗可减轻回肠的形态变化、细菌易位和磷酸化肌球蛋白轻链水平,与单独损伤相比。在给予乙醇和烧伤后给予 IL-6 抗体的野生型小鼠中,也重新建立了紧密连接蛋白 1 和闭合蛋白的定位。与类似处理的野生型小鼠相比,给予乙醇和烧伤损伤的 IL-6 敲除小鼠的肠道损伤也减少;然而,没有观察到细菌易位或紧密连接蛋白定位的变化。这些数据表明,IL-6 可能在 binge 乙醇暴露和烧伤损伤的联合损伤后观察到的肠道组织损伤中起作用,尽管在这种模型中完全缺失 IL-6 似乎没有益处。IL-6 的调节可能为预防乙醇暴露和烧伤损伤联合损伤后的肠道损伤和相关炎症提供新的选择。