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Ultrastructural changes in the pulmonary mechanical barriers in a rat model of severe acute pancreatitis-associated acute lung injury

文献类型： 外文期刊

作者： Wang, Feng 1 ; Lu, Fengchun 2 ; Huang, Heguang 2 ; Huang, Minmin 3 ; Luo, Tuyan 3 ;

作者机构： 1.Fuzhou Detachment Hosp CAPF, Dept Surg, Fuzhou, Fujian, Peoples R China

2.Fujian Med Univ, Affiliated Union Hosp, Dept Gen Surg, 29 Xinquan Rd, Fuzhou 350001, Fujian, Peoples R China

3.Fujian Acad Agr Sci, Ctr Electron Microscopy, Fuzhou, Fujian, Peoples R China

关键词： Acute lung injury;capillary permeability;electron microscope;severe acute pancreatitis;ultrastructural

期刊名称：ULTRASTRUCTURAL PATHOLOGY （ 影响因子：1.094； 五年影响因子：1.21 ）

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收录情况： SCI

摘要： This study examined the ultrastructural changes in the pulmonary mechanical barriers in a rat model of severe acute pancreatitis (SAP)-associated acute lung injury (ALI). Animals were randomized into the SAP group (n = 60) and the control group (n = 60). SAP was induced by retrograde injection of 5% taurocholic acid into the biliopancreatic duct. The morphological abnormalities assessed by histology and the lung wet/dry weight ratio and the ultrastructural abnormalities assessed by transmission electron microscope and scanning electron microscope examinations plus lanthanum nitrate tracing were compared between the two groups at 6, 12, and 24 h post-SAP induction (n = 10/group/time point). The SAP group had significantly greater extravascular effusion than the control group at each time point as assessed by the lung wet/dry weight ratio (p < .001). The severity of the tissue damage increased in the lung and pancreas over time in the SAP group (all p < .001). In the SAP group, ultrastructural damages to the endothelial, epithelial, and pleural barriers were apparent and the damages to the endothelial barrier were detected earlier than the other two barriers, suggesting its fundamental role in preventing the further development of SAP-associated ALI. Moreover, the ultrastructural abnormalities were detected earlier than symptoms and morphological changes. The ultrastructural damages in the endothelial, epithelial, and pleural barriers occurred in the early stage of SAP. The endothelial barrier is likely to be the first line to prevent the further development in this rat model of SAP-associated ALI.

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