Ghrelin attenuates hepatocellular injury and liver fibrogenesis in rodents and influences fibrosis progression in humans

El pdf del artículo es la versión pre-print.-- et al-There are no effective antifibrotic therapies for patients with liver diseases. We performed an experimental and translational study to investigate whether ghrelin, an orexigenic hormone with pleiotropic properties, modulates liver fibrogenesis. Recombinant ghrelin was administered to rats with chronic (bile duct ligation) and acute (carbon tetrachloride) liver injury. Hepatic gene expression was analyzed by way of microarray analysis and quantitative polymerase chain reaction. The hepatic response to chronic injury was also evaluated in wild-type and ghrelin-deficient mice. Primary human hepatic stellate cells were used to study the effects of ghrelin in vitro. Ghrelin hepatic gene expression and serum levels were assessed in patients with chronic liver diseases. Ghrelin gene polymorphisms were analyzed in patients with chronic hepatitis C. Recombinant ghrelin treatment reduced the fibrogenic response, decreased liver injury and myofibroblast accumulation, and attenuated the altered gene expression profile in bile duct-ligated rats. Moreover, ghrelin reduced the fibrogenic properties of hepatic stellate cells. Ghrelin also protected rats from acute liver injury and reduced the extent of oxidative stress and inflammation. Ghrelin-deficient mice developed exacerbated hepatic fibrosis and liver damage after chronic injury. In patients with chronic liver diseases, ghrelin serum levels decreased in those with advanced fibrosis, and ghrelin gene hepatic expression correlated with expression of fibrogenic genes. In patients with chronic hepatitis C, polymorphisms of the ghrelin gene (994CT and 604GA) influenced the progression of liver fibrosis. Conclusion: Ghrelin exerts antifibrotic effects in the liver and may represent a novel antifibrotic therapy. Copyright © 2010 by the American Association for the Study of Liver Diseases.Supported by grants from the Ministerio de Ciencia e Investigación (SAF2005-06245), from the Instituto de Salud Carlos III (FIS2005-050567, FIS 2008-PI08/0237 and PI070497), and from the European Community FP6 (LSHB-CT-2007-036644 - DIALOK) and by fellowships from Institut d’Investigacions Biomèdiques August Pi i Sunyer (to M. M. and M. D.), the Fundación Bilbao Vizcaya Argentaria (to M. D.) and the Fundació Clínic (to P. S. B.).Peer Reviewe

Primary biliary cirrhosis

Primary biliary cirrhosis (PBC) is a chronic and slowly progressive cholestatic liver disease of autoimmune etiology characterized by injury of the intrahepatic bile ducts that may eventually lead to liver failure. Affected individuals are usually in their fifth to seventh decades of life at time of diagnosis, and 90% are women. Annual incidence is estimated between 0.7 and 49 cases per million-population and prevalence between 6.7 and 940 cases per million-population (depending on age and sex). The majority of patients are asymptomatic at diagnosis, however, some patients present with symptoms of fatigue and/or pruritus. Patients may even present with ascites, hepatic encephalopathy and/or esophageal variceal hemorrhage. PBC is associated with other autoimmune diseases such as Sjogren's syndrome, scleroderma, Raynaud's phenomenon and CREST syndrome and is regarded as an organ specific autoimmune disease. Genetic susceptibility as a predisposing factor for PBC has been suggested. Environmental factors may have potential causative role (infection, chemicals, smoking). Diagnosis is based on a combination of clinical features, abnormal liver biochemical pattern in a cholestatic picture persisting for more than six months and presence of detectable antimitochondrial antibodies (AMA) in serum. All AMA negative patients with cholestatic liver disease should be carefully evaluated with cholangiography and liver biopsy. Ursodeoxycholic acid (UDCA) is the only currently known medication that can slow the disease progression. Patients, particularly those who start UDCA treatment at early-stage disease and who respond in terms of improvement of the liver biochemistry, have a good prognosis. Liver transplantation is usually an option for patients with liver failure and the outcome is 70% survival at 7 years. Recently, animal models have been discovered that may provide a new insight into the pathogenesis of this disease and facilitate appreciation for novel treatment in PBC

Recomendaciones para la detección, diagnóstico y seguimiento de los pacientes con enfermedad por hígado graso no alcohólico en atención primaria y hospitalaria

La enfermedad por hígado graso no alcohólico (EHGNA) es una de las enfermedades hepáticas crónicas más frecuentes, con una prevalencia del 20-30% en la población general y del 60-80% en poblaciones de riesgo. En un porcentaje no despreciable de pacientes la EHGNA progresa desde la esteatosis hacia a diferentes estadios de fibrosis y cirrosis. Por su alta prevalencia, la EHGNA se ha convertido en un problema de salud relevante que requiere de acciones específicas para su detección, diagnóstico, seguimiento y tratamiento. Además, dado que la EHGNA presenta un riesgo aumentado de morbimortalidad cardiovascular requiere un enfoque multidisciplinar para su tratamiento y seguimiento. Los pacientes en estadios iniciales de la enfermedad, sin fibrosis, pueden ser evaluados y recibir tratamiento en el ámbito de Atención Primaria, mientras que aquellos con enfermedad hepática avanzada se benefician de un seguimiento especializado en el ámbito hospitalario para prevenir y tratar las complicaciones hepáticas. El presente documento de consenso, elaborado por las Sociedades Catalanas de Digestología, Atención Primaria, Endocrinología, Diabetes y Medicina Interna nace de la necesidad de disenar ˜ estrategias que guíen los flujos de los pacientes entre el ámbito de Atención Primaria y Hospitalaria para poder ofrecer a los pacientes con EHGNA la mejor atención según el estadio de su enfermedad. En el documento de consenso se describen los métodos diagnósticos no invasivos más utilizados para el diagnóstico de los pacientes y se han disenado ˜ dos algoritmos para el tratamiento de los pacientes tanto en ámbito de atención primaria como de atención hospitalaria