INVESTIGADORES
ALANIZ Laura Daniela
artículos
Título:
Lack of the Matricellular Protein SPARC (Secreted Protein, Acidic and Rich in Cysteine) Attenuates Liver Fibrogenesis in Mice
Autor/es:
CATALINA ATORRASAGASTI; ESTANISLAO PEXIOTO; JORGE B. AQUINO; NESTOR KIPPES; MARIANA MALVICINI; LAURA ALANIZ; MARIANA GARCÍA; FLAVIA PICCIONI; ESTEBAN FIORE; JUAN BAYO; BATALLER R; GURUCEAGA ELIZABETH; CORRALES FERNANDO; OSVALDO PODHAJCER; GUILLERMO MAZZOLINI
Revista:
PLOS ONE
Editorial:
PUBLIC LIBRARY SCIENCE
Referencias:
Lugar: San Francisco; Año: 2013 vol. 8 p. 1 - 17
ISSN:
1932-6203
Resumen:
Introduction: Secreted Protein, Acidic and Rich in Cysteine (SPARC) is a matricellular protein involved in many biological processes and found over-expressed in cirrhotic livers. By mean of a genetic approach we herein provide evidence from different in vivo liver disease models suggesting a profibrogenic role for SPARC. Methods: Two in vivo models of liver fibrosis, based on TAA administration and bile duct ligation, were developed on SPARC wild-type (SPARC+/+ ) and knock-out (SPARC2/2) mice. Hepatic SPARC expression was analyzed by qPCR. Fibrosis was assessed by Sirius Red staining, and the maturation state of collagen fibers was analyzed using polarized light. Necroinflammatory activity was evaluated by applying the Knodell score and liver inflammatory infiltration was characterized by immunohistochemistry. Hepatic stellate cell activation was assessed by a-SMA immunohistochemistry. In addition, pro-fibrogenic genes and inflammatory cytokines were measured by qPCR and/or ELISA. Liver gene expression profile was analyzed in SPARC2/2 and SPARC+/+ mice using Affymetrix Mouse Gene ST 1.0 array. Results: SPARC expression was found induced in fibrotic livers of mouse and human. SPARC2/2 mice showed a reduction in the degree of inflammation, mainly CD4+ cells, and fibrosis. Consistently, collagen deposits and mRNA expression levels were decreased in SPARC2/2 mice when compared to SPARC+/+ mice; in addition, MMP-2 expression was increased in SPARC2/2 mice. A reduction in the number of activated myofibroblasts was observed. Moreover, TGF-b1 expression levels were down-regulated in the liver as well as in the serum of TAA-treated knock-out animals. Ingenuity Pathway Analysis (IPA) analysis suggested several gene networks which might involve protective mechanisms of SPARC deficiency against liver fibrogenesis and a better established machinery to repair DNA and detoxify from external chemical stimuli. Conclusions:Overall our data suggest that SPARC plays a significant role in liver fibrogenesis. Interventions to inhibit SPARC expression are suggested as promising approaches for liver fibrosis treatment.