Soluble TNF mediates the transition from pulmonary inflammation to fibrosis.

Soluble TNF mediates the transition from pulmonary inflammation to fibrosis.
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可溶性TNF介导了从肺部炎症到纤维化的过渡。

DOI:
10.1371/journal.pone.0000108
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发表时间:
2006-12-27
期刊:
影响因子:
3.7
通讯作者:
Aidinis, Vassilis
Aidinis, Vassilis
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Oikonomou, Nikos;Harokopos, Vaggelis;Zalevsky, Jonathan;Valavanis, Christos;Kotanidou, Anastasia;Szymkowski, David E.;Kollias, George;Aidinis, Vassilis

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纤维化,即用过量的纤维组织替代功能组织,可发生在所有主要组织和器官系统中,导致各种病理学病症。特发性肺纤维化是一种原型纤维化疾病,涉及多个部位持续性肺泡上皮损伤引起的异常伤口愈合。为了解释TNF和TNF介导的炎症在纤维化发展中的作用,我们利用了博莱霉素诱导的肺纤维化动物模型和一系列缺乏TNF信号传导组分的基因修饰小鼠。跨膜TNF表达被证明足以引起炎症反应,但不足以过渡到疾病的纤维化阶段。可溶性TNF的表达被证明是至关重要的淋巴细胞募集,TGF-β 1的表达和纤维化病变的发展的先决条件。此外,通过一系列的骨髓转移,所需的TNF表达被证明起源于非造血区室,进一步定位于造血上皮细胞。这些结果表明可溶性TNF在病理级联中的主要有害作用,将其与跨膜TNF的有益作用分开,并表明评估可溶性TNF拮抗剂在治疗特发性肺纤维化中的功效的重要性。
Fibrosis, the replacement of functional tissue with excessive fibrous tissue, can occur in all the main tissues and organ systems, resulting in various pathological disorders. Idiopathic Pulmonary Fibrosis is a prototype fibrotic disease involving abnormal wound healing in response to multiple sites of ongoing alveolar epithelial injury. To decipher the role of TNF and TNF-mediated inflammation in the development of fibrosis, we have utilized the bleomycin-induced animal model of Pulmonary Fibrosis and a series of genetically modified mice lacking components of TNF signaling. Transmembrane TNF expression is shown to be sufficient to elicit an inflammatory response, but inadequate for the transition to the fibrotic phase of the disease. Soluble TNF expression is shown to be crucial for lymphocyte recruitment, a prerequisite for TGF-b1 expression and the development of fibrotic lesions. Moreover, through a series of bone marrow transfers, the necessary TNF expression is shown to originate from the non-hematopoietic compartment further localized in apoptosing epithelial cells. These results suggest a primary detrimental role of soluble TNF in the pathologic cascade, separating it from the beneficial role of transmembrane TNF, and indicate the importance of assessing the efficacy of soluble TNF antagonists in the treatment of Idiopathic Pulmonary Fibrosis.
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