title: Cancer chemoprevention by an adenosine derivative in a model of cirrhosis-hepatocellular carcinoma induced by diethylnitrosamine in rats.
abstract: Hepatocellular carcinoma is one of the most common cancers, and approximately 80% develop from cirrhotic livers. We have previously shown that the aspartate salt of adenosine prevents and reverses carbon tetrachloride-induced liver fibrosis in rats. Considering the hepatoprotective role of this adenosine derivative in fibrogenesis, we were interested in evaluating its effect in a hepatocarcinogenesis model induced by diethylnitrosamine in rats, where multinodular cancer is preceded by cirrhosis. Rats were injected with diethylnitrosamine for 12 weeks to induce cirrhosis and for 16 weeks to induce hepatocarcinogenesis. Groups of rats were treated with aspartate salt of adenosine from the beginning of carcinogen administration for 12 or 18 weeks total, and another group received the compound from weeks 12 to 18. Fibrogenesis was estimated and the proportion of preneoplastic nodules and tumors was measured. The apoptotic and proliferation rates in liver tissues were evaluated, as well as the expression of cell signaling and cell cycle proteins participating in hepatocarcinogenesis. The adenosine derivative treatment reduced diethylnitrosamine-induced collagen expression and decreased the proportion of nodules positive for the tumor marker γ-glutamyl transferase. This compound down-regulated the expression of thymidylate synthase and hepatocyte growth factor, and augmented the protein level of the cell cycle inhibitor p27; these effects could be part of its chemopreventive mechanism. These findings suggest a hepatoprotective role of aspartate salt of adenosine that could be used as a therapeutic compound in the prevention of liver tumorigenesis as described earlier for hepatic fibrosis.
authors.affiliation: 1 Departamento de Biología Celular y Desarrollo, Instituto de Fisiología Celular (IFC), Universidad Nacional Autónoma de México (UNAM), México City, México.
authors.forename: Gabriela
authors.initials: G
authors.lastname: Velasco-Loyden
authors.affiliation: 1 Departamento de Biología Celular y Desarrollo, Instituto de Fisiología Celular (IFC), Universidad Nacional Autónoma de México (UNAM), México City, México.
authors.forename: Lidia
authors.initials: L
authors.lastname: Pérez-Martínez
authors.affiliation: 1 Departamento de Biología Celular y Desarrollo, Instituto de Fisiología Celular (IFC), Universidad Nacional Autónoma de México (UNAM), México City, México.
authors.forename: Susana
authors.initials: S
authors.lastname: Vidrio-Gómez
authors.affiliation: 2 Laboratorio de Bioquímica y Estructura de Proteínas, Instituto Nacional de Medicina Genómica (INMEGEN), México City, México.
authors.forename: Julio Isael
authors.initials: JI
authors.lastname: Pérez-Carreón
authors.affiliation: 1 Departamento de Biología Celular y Desarrollo, Instituto de Fisiología Celular (IFC), Universidad Nacional Autónoma de México (UNAM), México City, México.
authors.forename: Victoria
authors.initials: V
authors.lastname: Chagoya de Sánchez
mesh_terms: D000241:Adenosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000818:Animals; D016588:Anticarcinogenic Agents / Q000494:pharmacology; D004052:Diethylnitrosamine; D004195:Disease Models, Animal; D008103:Liver Cirrhosis / Q000139:chemically induced / Q000150:complications* / Q000188:drug therapy*; D008114:Liver Neoplasms, Experimental / Q000209:etiology* / Q000517:prevention & control*; D008297:Male; D051381:Rats; D017208:Rats, Wistar
chemical_list: D016588:Anticarcinogenic Agents; C548964:adenosine 2-aminosuccinic acid-2-(6-amino-9H-purin-9-yl)-5-(hydroxymethyl)tetrahydrofuran-3,4-diol; D004052:Diethylnitrosamine; D000241:Adenosine
keywords: HGF-c-Met pathway; Liver cancer; adenosine; cell cycle inhibitor p27; diethylnitrosamine; thymidylate synthase