Influence of obesity on remodeling of lung tissue and organization of extracellular matrix after blunt thorax trauma

作者：Pengfei Xu, Fabian Gärtner, Adrian Gihring, Congxing Liu, Timo Burster, Martin Wabitsch, Uwe Knippschild, Stephan Paschke · 发表于：Respiratory Research · 年份：2020 · DOI：10.1186/s12931-020-01502-0 · 被引用次数：18 · 研究领域：Trauma Management and Diagnosis、Congenital Diaphragmatic Hernia Studies、Tissue Engineering and Regenerative Medicine

BACKGROUND: Previously, it has been shown that obesity is a risk factor for recovery, regeneration, and tissue repair after blunt trauma and can affect the rate of muscle recovery and collagen deposition after trauma. To date, lung tissue regeneration and extracellular matrix regulation in obese mice after injury has not been investigated in detail yet. METHODS: This study uses an established blunt thorax trauma model to analyze morphological changes and alterations on gene and protein level in lean or obese (diet-induced obesity for 16 ± 1 week) male C57BL/6 J mice at various time-points after trauma induction (1 h, 6 h, 24 h, 72 h and 192 h). RESULTS: Morphological analysis after injury showed lung parenchyma damage at early time-points in both lean and obese mice. At later time-points a better regenerative capacity of lean mice was observed, since obese animals still exhibited alveoli collapse, wall thickness as well as remaining filled alveoli structures. Although lean mice showed significantly increased collagen and fibronectin gene levels, analysis of collagen deposition showed no difference based on colorimetric quantification of collagen and visual assessment of Sirius red staining. When investigating the organization of the ECM on gene level, a decreased response of obese mice after trauma regarding extracellular matrix composition and organization was detectable. Differences in the lung tissue between the diets regarding early responding MMPs (MMP8/9) and late respo...