title: Soluble factors derived from human amniotic epithelial cells suppress collagen production in human hepatic stellate cells.
abstract: BACKGROUND
  Intravenous infusion of human amniotic epithelial cells (hAECs) has been shown to ameliorate hepatic fibrosis in murine models. Hepatic stellate cells (HSCs) are the principal collagen-secreting cells in the liver. The aim of this study was to investigate whether factors secreted by hAECs and present in hAEC-conditioned medium (CM) have anti-fibrotic effects on activated human HSCs.
  
  
  METHODS
  Human AECs were isolated from the placenta and cultured. Human hepatic stellate cells were exposed to hAEC CM to determine potential anti-fibrotic effects.
  
  
  RESULTS
  HSCs treated for 48 h with hAEC CM displayed a significant reduction in the expression of the myofibroblast markers α-smooth muscle actin and platelet-derived growth factor. Expression of the pro-fibrotic cytokine transforming growth factor-β1 (TGF-β1) and intracellular collagen were reduced by 45% and 46%, respectively. Human AEC CM induced HSC apoptosis in 11.8% of treated cells and reduced HSC proliferation. Soluble human leukocyte antigen-G1, a hAEC-derived factor, significantly decreased TGF-β1 and collagen production in activated HSCs, although the effect on collagen production was less than that of hAEC CM. The reduction in collagen and TGF-B1 could not be attributed to PGE2, relaxin, IL-10, TGF-B3, FasL or TRAIL.
  
  
  CONCLUSIONS
  Human AEC CM treatment suppresses markers of activation, proliferation and fibrosis in human HSCs as well as inducing apoptosis and reducing proliferation. Human AEC CM treatment may be effective in ameliorating liver fibrosis and warrants further study.
authors.affiliation: Centre for Inflammatory Diseases, Monash University, Melbourne, Australia; Gastroenterology and Hepatology Unit, Monash Health, Melbourne, Australia.
authors.forename: Alexander
authors.initials: A
authors.lastname: Hodge
authors.affiliation: Centre for Inflammatory Diseases, Monash University, Melbourne, Australia; Gastroenterology and Hepatology Unit, Monash Health, Melbourne, Australia.
authors.forename: Dinushka
authors.initials: D
authors.lastname: Lourensz
authors.affiliation: Centre for Genetic Diseases, Monash Institute of Medical Research, Monash University, Melbourne, Australia.
authors.forename: Vijesh
authors.initials: V
authors.lastname: Vaghjiani
authors.affiliation: Centre for Inflammatory Diseases, Monash University, Melbourne, Australia; Gastroenterology and Hepatology Unit, Monash Health, Melbourne, Australia.
authors.forename: Huyen
authors.initials: H
authors.lastname: Nguyen
authors.affiliation: Centre for Inflammatory Diseases, Monash University, Melbourne, Australia; Gastroenterology and Hepatology Unit, Monash Health, Melbourne, Australia.
authors.forename: Jorge
authors.initials: J
authors.lastname: Tchongue
authors.affiliation: Department of Anatomy and Developmental Biology, Monash University, Melbourne, Australia.
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.affiliation: Department of Obstetrics & Gynaecology, University of Melbourne & Pregnancy Research Centre, Department of Perinatal Medicine, Royal Women's Hospital, Melbourne, Australia.
authors.forename: Padma
authors.initials: P
authors.lastname: Murthi
authors.affiliation: Centre for Inflammatory Diseases, Monash University, Melbourne, Australia; Gastroenterology and Hepatology Unit, Monash Health, Melbourne, Australia.
authors.forename: William
authors.initials: W
authors.lastname: Sievert
authors.affiliation: Centre for Genetic Diseases, Monash Institute of Medical Research, Monash University, Melbourne, Australia. Electronic address: ursula.manuelpillai@monash.edu.
authors.forename: Ursula
authors.initials: U
authors.lastname: Manuelpillai
mesh_terms: D000653:Amniotic Fluid / Q000166:cytology* / Q000378:metabolism; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D003094:Collagen / Q000096:biosynthesis* / Q000378:metabolism; D017077:Culture Media, Conditioned / Q000494:pharmacology*; D004195:Disease Models, Animal; D004847:Epithelial Cells / Q000166:cytology / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D055166:Hepatic Stellate Cells / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D006801:Humans; D016212:Transforming Growth Factor beta / Q000096:biosynthesis
chemical_list: D017077:Culture Media, Conditioned; D016212:Transforming Growth Factor beta; D003094:Collagen
keywords: amnion epithelial cells; hepatic stellate cells; liver cirrhosis; placental stem cells