title: Role of Chymase in the Development of Liver Cirrhosis and Its Complications: Experimental and Human Data.
abstract: BACKGROUND
  Tissue Angiotensin II (Ang-II), produced through local non ACE-dependent pathways, stimulates liver fibrogenesis, renal vasoconstriction and sodium retention.
  
  
  OBJECTIVE
  To highlight chymase-dependent pathway of Ang-II production in liver and kidney during cirrhosis development.
  
  
  METHODS
  Liver histology, portal pressure, liver and kidney function, and hormonal status were investigated in rat liver cirrhosis induced through 13 weeks of CCl4, with or without chymase inhibitor SF2809E, administered between 4th and 13th CCl4 weeks; liver and kidney chymase immunolocation and Ang-II content were assessed. Chymase immunohistochemistry was also assessed in normal and cirrhotic human liver, and chymase mRNA transcripts were measured in human HepG2 cells and activated hepatic stellate cells (HSC/MFs) in vitro.
  
  
  RESULTS
  Rats receiving both CCl4 and SF2809E showed liver fibrotic septa focally linking portal tracts but no cirrhosis, as compared to ascitic cirrhotic rats receiving CCl4. SF2809E reduced portal pressure, plasma bilirubin, tissue content of Ang-II, plasma renin activity, norepinephrine and vasopressin, and increased glomerular filtration rate, water clearance, urinary sodium excretion. Chymase tissue content was increased and detected in α-SMA-positive liver myofibroblasts and in kidney tubular cells of cirrhotic rats. In human cirrhosis, chymase was located in hepatocytes of regenerative nodules. Human HepG2 cells and HSC/MFs responded to TGF-β1 by up-regulating chymase mRNA transcription.
  
  
  CONCLUSIONS
  Chymase, through synthesis of Ang-II and other mediators, plays a role in the derangement of liver and kidney function in chronic liver diseases. In human cirrhosis, chymase is well-represented and apt to become a future target of pharmacological treatment.
authors.affiliation: Division of Gastroenterology, Humanitas Gradenigo Hospital, Torino, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Sansoè
authors.affiliation: Department of Clinical and Biological Sciences, University of Torino, Torino, Italy.
authors.forename: Manuela
authors.initials: M
authors.lastname: Aragno
authors.affiliation: Department of Clinical and Biological Sciences, University of Torino, Torino, Italy.
authors.forename: Raffaella
authors.initials: R
authors.lastname: Mastrocola
authors.affiliation: Clinical Biochemistry Laboratory, San Giovanni Battista Hospital, Torino, Italy.
authors.forename: Giulio
authors.initials: G
authors.lastname: Mengozzi
authors.affiliation: Department of Clinical and Biological Sciences, University of Torino, Torino, Italy.
authors.forename: Erica
authors.initials: E
authors.lastname: Novo
authors.affiliation: Department of Clinical and Biological Sciences, University of Torino, Torino, Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Parola
mesh_terms: D000804:Angiotensin II / Q000378:metabolism; D000818:Animals; D053818:Chymases / Q000502:physiology*; D006801:Humans; D007150:Immunohistochemistry; D007668:Kidney / Q000201:enzymology; D007677:Kidney Function Tests; D008099:Liver / Q000201:enzymology; D008103:Liver Cirrhosis / Q000139:chemically induced / Q000201:enzymology* / Q000503:physiopathology; D008111:Liver Function Tests; D008297:Male; D017082:Portal Pressure; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000804:Angiotensin II; D053818:Chymases