Lack of Guanylate Cyclase C results in increased mortality in mice following liver injury

BMC Gastroenterology

Research Article

Mitchell B Cohen¹  Elizabeth A Mann¹  Kumar Shanmukhappa² 

[1] Division of Gastroenterology, Hepatology, and Nutrition, Cincinnati Children's Hospital Medical Center and the University of Cincinnati, Cincinnati, OH, USA;Division of Gastroenterology, Hepatology, and Nutrition, Cincinnati Children's Hospital Medical Center and the University of Cincinnati, Cincinnati, OH, USA;Section of Comparative Pathology, New England Primate Research Center, Harvard Medical School, Southborough, MA, USA;

关键词: Proliferate Cell Nuclear Antigen;    Wild Type Littermate;    Acute Liver Injury;    Hepatocyte Proliferation;    CCl4 Administration;   

DOI  :  10.1186/1471-230X-10-86

 received in 2010-01-15, accepted in 2010-08-02,  发布年份 2010

来源: Springer

【 摘 要 】

BackgroundGuanylate Cyclase C (GC-C) expression in the intestine plays a role in the regulation of fluid and ion transport, as well as epithelial cell apoptosis and proliferation. In the adult rat liver, GC-C expression is increased in response to injury. We hypothesized that GC-C is required for repair/recovery from liver injury.MethodsWe subjected wild type (WT) and GC-C deficient mice to acute liver injury with a single injection of the hepatotoxin carbon tetrachloride. Changes in the level of expression of GC-C and its ligands uroguanylin and guanylin were quantified by real-time PCR. Liver morphology, and hepatocyte necrosis, apoptosis and proliferation, were examined at 1-3 days post-injury in mice on a mixed genetic background. Survival was followed for 14 days after carbon tetrachloride injection in wild type and GC-C deficient mice on both a mixed genetic background and on an inbred C57BL6/J background.ResultsGC-C deficient mice on the mixed genetic background nearly all died (median survival of 5 days) following carbon tetrachloride injection while WT littermates experienced only 35% mortality. Elevated levels of TUNEL-positive hepatocyte death on post-injury day 1, increased apoptosis on day 2, and increased areas of centrilobular necrosis on days 2 and 3, were evident in livers from GC-C null mice compared to WT. Collectively these data suggest increased hepatocyte death in the GC-C null mice in the early time period after injury. This corresponds temporally with increased expression of GC-C and its ligands guanylin and uroguanylin in post-injury WT mouse liver. The hepatocyte proliferative response to injury was the same in both genotypes. In contrast, there was no difference in survival between GC-C null and WT mice on the inbred C57BL/6 J background in response to acute liver injury.ConclusionsSignalling via GC-C promotes hepatocyte survival in vivo and is required for effective recovery from acute toxic injury to the liver in a strain-specific manner.

【 授权许可】

CC BY   
© Mann et al; licensee BioMed Central Ltd. 2010