Volume 38, Issue 9 pp. 1664-1675
ORIGINAL ARTICLE

Bone morphogenetic protein 9 as a key regulator of liver progenitor cells in DDC-induced cholestatic liver injury

Annalisa Addante

Annalisa Addante

Faculty of Pharmacy, Department Biochemistry and Molecular Biology, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos, Madrid, Spain

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Cesáreo Roncero

Cesáreo Roncero

Faculty of Pharmacy, Department Biochemistry and Molecular Biology, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos, Madrid, Spain

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Laura Almalé

Laura Almalé

Faculty of Pharmacy, Department Biochemistry and Molecular Biology, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos, Madrid, Spain

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Nerea Lazcanoiturburu

Nerea Lazcanoiturburu

Faculty of Pharmacy, Department Biochemistry and Molecular Biology, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos, Madrid, Spain

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María García-Álvaro

María García-Álvaro

Faculty of Pharmacy, Department Biochemistry and Molecular Biology, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos, Madrid, Spain

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Margarita Fernández

Margarita Fernández

Faculty of Pharmacy, Department Biochemistry and Molecular Biology, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos, Madrid, Spain

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Julián Sanz

Julián Sanz

Department Pathology, Hospital Clínico San Carlos, Madrid, Spain

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Seddik Hammad

Seddik Hammad

Medical Faculty Mannheim, Department Medicine II, Heidelberg University, Manhheim, Germany

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Zeribe C. Nwosu

Zeribe C. Nwosu

Medical Faculty Mannheim, Department Medicine II, Heidelberg University, Manhheim, Germany

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Se-Jin Lee

Se-Jin Lee

Department Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD, USA

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Isabel Fabregat

Isabel Fabregat

Bellvitge Biomedical Research Institute, L’Hospitalet de Llobregat, Barcelona, Spain

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Steven Dooley

Steven Dooley

Medical Faculty Mannheim, Department Medicine II, Heidelberg University, Manhheim, Germany

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Peter ten Dijke

Peter ten Dijke

Department Cell and Chemical Biology and Oncode Institute, Leiden University Medical Center, RC, Leiden, The Netherlands

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Blanca Herrera

Blanca Herrera

Faculty of Pharmacy, Department Biochemistry and Molecular Biology, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos, Madrid, Spain

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Aránzazu Sánchez

Corresponding Author

Aránzazu Sánchez

Faculty of Pharmacy, Department Biochemistry and Molecular Biology, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos, Madrid, Spain

Correspondence

Aránzazu Sánchez, Faculty of Pharmacy, Department of Biochemistry and Molecular Biology, Complutense University of Madrid, Madrid, Spain.

Email: [email protected]

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First published: 11 May 2018
Citations: 28

Funding Information

This work was supported by a Marie Curie Action of FP7-2012 (Grant #PITN-GA-2012-316549; IT-LIVER); Ministry of Economy and Competitiveness, Spain (Grant #SAF2015-69145-R); Health Research Fund-Institute of Health Carlos III, Spain (Grant #PI10/00274); and General Direction of Universities and Research of the Autonomous Community of Madrid, Spain (Grant #S2010/BMD-2402).

Handling Editor: Frank Tacke
Blanca Herrera and Aránzazu Sánchez are Co-senior authors.

Abstract

Background & Aims

Bone morphogenetic protein 9 (BMP9) interferes with liver regeneration upon acute injury, while promoting fibrosis upon carbon tetrachloride-induced chronic injury. We have now addressed the role of BMP9 in 3,5 diethoxicarbonyl-1,4 dihydrocollidine (DDC)-induced cholestatic liver injury, a model of liver regeneration mediated by hepatic progenitor cell (known as oval cell), exemplified as ductular reaction and oval cell expansion.

Methods

WT and BMP9KO mice were submitted to DDC diet. Livers were examined for liver injury, fibrosis, inflammation and oval cell expansion by serum biochemistry, histology, RT-qPCR and western blot. BMP9 signalling and effects in oval cells were studied in vitro using western blot and transcriptional assays, plus functional assays of DNA synthesis, cell viability and apoptosis. Crosslinking assays and short hairpin RNA approaches were used to identify the receptors mediating BMP9 effects.

Results

Deletion of BMP9 reduces liver damage and fibrosis, but enhances inflammation upon DDC feeding. Molecularly, absence of BMP9 results in overactivation of PI3K/AKT, ERK-MAPKs and c-Met signalling pathways, which together with an enhanced ductular reaction and oval cell expansion evidence an improved regenerative response and decreased damage in response to DDC feeding. Importantly, BMP9 directly targets oval cells, it activates SMAD1,5,8, decreases cell growth and promotes apoptosis, effects that are mediated by Activin Receptor-Like Kinase 2 (ALK2) type I receptor.

Conclusions

We identify BMP9 as a negative regulator of oval cell expansion in cholestatic injury, its deletion enhancing liver regeneration. Likewise, our work further supports BMP9 as an attractive therapeutic target for chronic liver diseases.

CONFLICT OF INTEREST

The authors do not have any disclosures to report.

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