Anti-fibrotic effects of fresh and cryopreserved human amniotic membrane in a rat liver fibrosis model

Emanuele Ricci, Graziella Vanosi, Andrea Lindenmair, Simone Hennerbichler, Anja Peterbauer-Scherb, Susanne Wolbank, Anna Cargnoni, Patrizia Bonassi Signoroni, Marino Campagnol, Christian Gabriel, Heinz Redl, Ornella Parolini

Research output: Contribution to journalArticlepeer-review


The human amniotic membrane (hAM), thanks to its favorable properties, including anti-inflammatory, anti-fibrotic and pro-regenerative effects, is a well-known surgical material for many clinical applications, when used both freshly after isolation and after preservation. We have shown previously that hAM patching is a potential approach to counteract liver fibrosis. Indeed, when fresh hAM was used to cover the liver surface of rats with liver fibrosis induced by the bile duct ligation (BDL) procedure, the progression and severity of fibrosis were significantly reduced. Since cryopreservation enables safety and long-term storage of hAM but may influence its functional properties, here we compared the anti-fibrotic effects of fresh and cryopreserved hAM in rats with BDL-induced liver fibrosis. After BDL, the rat liver was covered with a piece of fresh or cryopreserved hAM, or left untreated. Six weeks later, the degree of liver fibrosis was assessed histologically using the Knodell and the METAVIR scoring systems. Digital image analysis was used to quantify the percentage of the areas of each liver section displaying ductular reaction, extracellular matrix (ECM) deposition, activated myofibroblasts and hepatic stellate cells (HSCs). Liver collagen content was also determined by spectrophotometric technique. The degree of liver fibrosis, ductular reaction, ECM deposition, and the number of activated myofibroblasts and HSCs were all significantly reduced in hAM-treated rats compared to control animals. Fresh and cryopreserved hAM produced the same anti-fibrotic effects. These findings indicate that cryopreservation maintains the anti-fibrotic properties of hAM when used as a patch to reduce the severity of liver fibrosis.

Original languageEnglish
Pages (from-to)475-488
Number of pages14
JournalCell and Tissue Banking
Issue number3
Publication statusPublished - Sep 2013


  • Bile duct ligation
  • Collagen content
  • Cryopreservation
  • Digital image analysis
  • Human amniotic membrane
  • Liver fibrosis

ASJC Scopus subject areas

  • Transplantation
  • Biomaterials
  • Biomedical Engineering
  • Cell Biology


Dive into the research topics of 'Anti-fibrotic effects of fresh and cryopreserved human amniotic membrane in a rat liver fibrosis model'. Together they form a unique fingerprint.

Cite this