Gao Xiao, Lampraki Eirini-Maria, Al-Khalidi Sarwah, Qureshi Muhammad Asif, Desai Rhea, Wilson Joanna Beatrice
College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, United Kingdom.
PLoS One. 2017 Dec 11;12(12):e0189167. doi: 10.1371/journal.pone.0189167. eCollection 2017.
Chronic inflammation results when the immune system responds to trauma, injury or infection and the response is not resolved. It can lead to tissue damage and dysfunction and in some cases predispose to cancer. Some viruses (including Epstein-Barr virus (EBV)) can induce inflammation, which may persist even after the infection has been controlled or cleared. The damage caused by inflammation, can itself act to perpetuate the inflammatory response. The latent membrane protein 1 (LMP1) of EBV is a pro-inflammatory factor and in the skin of transgenic mice causes a phenotype of hyperplasia with chronic inflammation of increasing severity, which can progress to pre-malignant and malignant lesions. LMP1 signalling leads to persistent deregulated expression of multiple proteins throughout the mouse life span, including TGFα S100A9 and chitinase-like proteins. Additionally, as the inflammation increases, numerous chemokines and cytokines are produced which promulgate the inflammation. Deposition of IgM, IgG, IgA and IgE and complement activation form part of this process and through genetic deletion of CD40, we show that this contributes to the more tissue-destructive aspects of the phenotype. Treatment of the mice with N-acetylcysteine (NAC), an antioxidant which feeds into the body's natural redox regulatory system through glutathione synthesis, resulted in a significantly reduced leukocyte infiltrate in the inflamed tissue, amelioration of the pathological features and delay in the inflammatory signature measured by in vivo imaging. Reducing the degree of inflammation achieved through NAC treatment, had the knock on effect of reducing leukocyte recruitment to the inflamed site, thereby slowing the progression of the pathology. These data support the idea that NAC could be considered as a treatment to alleviate chronic inflammatory pathologies, including post-viral disease. Additionally, the model described can be used to effectively monitor and accurately measure therapies for chronic inflammation.
当免疫系统对创伤、损伤或感染作出反应且反应未得到解决时,就会导致慢性炎症。它会导致组织损伤和功能障碍,在某些情况下还会引发癌症。一些病毒(包括爱泼斯坦 - 巴尔病毒(EBV))可诱发炎症,即使感染已得到控制或清除,炎症仍可能持续存在。炎症造成的损伤本身可促使炎症反应持续。EBV的潜伏膜蛋白1(LMP1)是一种促炎因子,在转基因小鼠的皮肤中会导致增生表型,并伴有严重程度不断增加的慢性炎症,进而可发展为癌前病变和恶性病变。LMP1信号传导导致多种蛋白质在小鼠整个生命周期中持续表达失调,包括转化生长因子α、S100A9和几丁质酶样蛋白。此外,随着炎症加剧,会产生大量趋化因子和细胞因子,从而加剧炎症。IgM、IgG、IgA和IgE的沉积以及补体激活是这一过程的一部分,通过基因敲除CD40,我们发现这会导致该表型更具组织破坏性。用N - 乙酰半胱氨酸(NAC)治疗小鼠,NAC是一种抗氧化剂,通过谷胱甘肽合成进入人体天然氧化还原调节系统,结果显示炎症组织中的白细胞浸润显著减少,病理特征得到改善,通过体内成像测量的炎症特征出现延迟。通过NAC治疗降低炎症程度,具有减少白细胞向炎症部位募集的连锁效应,从而减缓病理进程。这些数据支持这样一种观点,即NAC可被视为一种缓解慢性炎症性疾病(包括病毒感染后疾病)的治疗方法。此外,所描述的模型可用于有效监测和准确测量慢性炎症的治疗方法。