Summary box
What is already known about this subject?
Currently there are no effective anti-fibrotic drugs to treat liver fibrosis and there is an urgent unmet need to increase our knowledge of the disease process and develop better tools for anti-fibrotic drug discovery.
Preclinical in vitro cell cultures and animal models are widely used to study liver fibrosis and test anti-fibrotic drugs, but have shortfalls; cell culture models lack the relevant complex cell-cell interactions of the liver and animal models only reproduce some features of human disease.
Precision Cut Liver Slices (PCLS) are structurally representative of the liver and can be used to model liver fibrosis and test anti-fibrotic drugs. However, PCLS are typically cultured in elevated, non-physiological oxygen levels and only have a healthy lifespan of 48h.
What are the new findings?
We have developed a novel bioreactor culture system that increases the longevity of functional PCLS to up to 6 days under normoxic conditions.
Bioreactor cultured PCLS can be used to model fibrogenesis in both normal and fibrotic PCLS using a combination of biochemical and histological outputs.
Administration of an Alk5 inhibitor effectively limits fibrogenesis in normal rodent and human PCLS and in rodent PCLS with established fibrosis.
How might it impact on clinical practice in the foreseeable future?
The extended longevity of bioreactor cultured PCLS represent a novel pre-clinical tool to investigate the cellular and molecular mechanisms of liver fibrosis.
Bioreactor cultured human PCLS offer a clinically relevant system to test efficacy of anti-fibrotic drugs.
Objective Precision cut liver slices (PCLS) retain the structure and cellular composition of the native liver and represent an improved system to study liver fibrosis compared to two-dimensional mono or co-cultures. The objective of this study was to develop a bioreactor system to increase the healthy lifespan of PCLS and model fibrogenesis.
Design PCLS were generated from normal rat or human liver, or 4-week carbon tetrachloride-fibrotic rat liver and cultured in our patented bioreactor. PCLS function was quantified by albumin ELISA. Fibrosis was induced in PCLS by TGFβ1 and PDGFββ stimulation. Alk5 inhibitor therapy was used. Fibrosis was assessed by fibrogenic gene expression, Picrosirius Red and αSmooth Muscle Actin staining, hydroxyproline assay and collagen 1a1, fibronectin and hyaluronic acid ELISA.
Results Bioreactor cultured PCLS are viable, maintaining tissue structure and stable albumin secretion for up to 6 days under normoxic culture conditions. Conversely, standard static transwell cultured PCLS rapidly deteriorate and albumin secretion is significantly impaired by 48 hours. TGFβ1 and PDGFββ stimulation of rat or human PCLS induced fibrogenic gene expression, release of extracellular matrix proteins, activation of hepatic myofibroblasts and histological fibrosis. Fibrogenesis slowly progresses over 6-days in cultured fibrotic rat PCLS without exogenous challenge. Alk5 inhibitor limited fibrogenesis in both TGFβ1 and PDGFββ stimulated PCLS and fibrotic PCLS.
Conclusion We describe a new bioreactor technology which maintains functional PCLS cultures for 6 days. Bioreactor cultured PCLS can be successfully used to model fibrogenesis and demonstrate efficacy of an anti-fibrotic therapy.
Footnotes
↵* Contact information: Joint senior author.
- Abbreviations
- AST
- Aspartate aminotransferase
- α-SMA
- α-smooth muscle actin
- CCl4
- chronic carbon tetrachloride
- COL1a1
- collagen 1a1
- fPCLS
- Fibrotic Precision-Cut Liver Slices
- FFPE
- formalin-fixed paraffin-embedded
- H&E
- haematoxylin & eosin
- HM
- hepatic myofibroblast
- hPCLS
- Human Precision-Cut Liver Slices
- HA
- hyaluronic acid
- MOA
- Mechanism of Action
- PCLS
- Precision-Cut Liver Slices
- PDGFββ
- Platelet derived growth factor
- qHSC
- quiescent hepatic stellate cells
- TGFβ1
- transforming growth factor beta 1
- TIMP1
- tissue inhibitor of metalloproteinase 1
- SEM
- standard error of the mean
Financial support: The research leading to these results has received funding from a Medical Research Council Confidence in Concept award grant reference MC_PC_13071 to FO, MD and LB, an MRC programme grant awarded to DAM and FO grant reference MK/K001949/1. This work was supported in part by AbbVie’s contribution of funding to the study to JM, DAM, LAB and FO and European Union Horizon 2020 Programme under the EPoS project (grant agreement no. 634413) funds OG and FO. The work was also supported in part by GSK contribution of funding to the study to DAM, LB and FO (CRAFT consortium). The research was supported by the National Institute for Health Research Newcastle Biomedical Research Centre based at Newcastle Hospitals NHS Foundation Trust and Newcastle University.