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The Korean Journal of Pathology 1996;30(7): 604-615.
The Morphologic Changes of the Sinusoidal Endothelial Cells in N-diethylnitrosamine Induced Cirrhotic Rat Liver.
Ok Ji Paik, Hee Kyung Park, Jong Min Chae, Jyung Sik Kwak, Tae Joong Sohn
1Department of Pathology, Wallace Memorial Baptist Hospital, Taegu, Korea.
2Department of Oral Pathology, School of Dentistry, Kyungpook National University, Taegu, Korea.
3Department of Pathology, School of Medicine, Kyungpook National University, Taegu, Korea.
The purpose of this study is to investigate the morphologic changes of the sinusoidal endothelial cells and the associated structures of the cirrhotic rat liver induced by repeat intraperitoneal injections of N-diethylnitrosamine (DEN) (100 mg/kg/week). One day to 6 weeks later, rat livers were observed under the light, transmission and scanning electron microscopy, and immunostained with laminin antibody. Two weeks after DEN treatment, the fibrillar material in Disse's space was noted, and then a basement membrane-like structure was found at 4 weeks after treatment. Laminin was detected in perisinusoidal areas after 4 weeks. Laminin was strongly positive on the fibrous septum and in the sinusoidal wall of cirrhotic nodules after 6 weeks of treatment. The diameters and numbers of sinusoidal endothelial fenestrations did not change significantly until 2 weeks. They decreased within 4 weeks, and then the sinusoidal endothelium was poorly fenestrated at 6 weeks after DEN treatment. These results suggest that as fibrosis develops in cirrhosis, the deposit of extracellular matrix such as laminin within Disse's space is a major contributing factor in the structural alteration of sinusoidal endothelial cells, and the capillarization of the sinusoidal endothelial cells may be a contributor to impairment of the hepatic function in cirrhosis.
Key Words: Rat liver; Cirrhosis; Sinusoidal endothelial cell; Laminin; Scanning electron microscopy