Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5504196 | Acta Histochemica | 2017 | 8 Pages |
Abstract
Combined pulmonary fibrosis and emphysema (CPFE) is an “umbrella term” encompassing emphysema and pulmonary fibrosis, but its pathogenesis is not known. We established two models of CPFE in mice using tracheal instillation with bleomycin (BLM) or murine gammaherpesvirus 68 (MHV-68). Experimental mice were divided randomly into four groups: A (normal control, n = 6), B (emphysema, n = 6),âC (emphysema + MHV-68, n = 24), D (emphysema + BLM, n = 6). Group C was subdivided into four groups: C1 (sacrificed on day 367, 7âdays after tracheal instillation of MHV-68); C2 (day 374; 14 days); C3 (day 381; 21 days); C4 (day 388; 28 days). Conspicuous emphysema and interstitial fibrosis were observed in BLM and MHV-68 CPFE mouse models. However, BLM induced diffuse pulmonary interstitial fibrosis with severely diffuse pulmonary inflammation; MHV-68 induced relatively modest inflammation and fibrosis, and the inflammation and fibrosis were not diffuse, but instead around bronchioles. Inflammation and fibrosis were detectable in the day-7 subgroup and reached a peak in the day-28 subgroup in the emphysemaâ+âMHV-68 group. Levels of macrophage chemoattractant protein-1, macrophage inflammatory protein-1α, interleukin-13, and transforming growth factor-β1 in bronchoalveolar lavage fluid were increased significantly in both models. Percentage of apoptotic type-2 lung epithelial cells was significantly higher; however, all four types of cytokine and number of macrophages were significantly lower in the emphysema + MHV-68 group compared with the emphysemaâ + BLM group. The different changes in pathology between BLM and MHV-68 mice models demonstrated different pathology subtypes of CPFE: macrophage infiltration and apoptosis of type-II lung epithelial cells increased with increasing pathology score for pulmonary fibrosis.
Keywords
apoptosis indexMHV-68BLMMacrophage chemoattractant protein-1IL-13CPFEMCP-1/CCl2EBVMLIInterleukin-13BALFBleomycinTransforming growth factor-β1Terminal deoxynucleotidyl transferase-mediated dUTP nick end labelingTUNELCombined pulmonary fibrosis and emphysemaBronchoalveolar lavage fluidmean linear interceptMice modelHematoxylin and EosinEpstein barr virus
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Authors
Wan-Guang Zhang, Si-Si Wu, Li He, Qun Yang, Yi-Kuan Feng, Yue-Tao Chen, Guo-Hua Zhen, Yong-Jian Xu, Zhen-Xiang Zhang, Jian-Ping Zhao, Hui-Lan Zhang,