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Morzyglod L, Caüzac M, Popineau L, Denechaud PD, Fajas L, Ragazzon B, Fauveau V, Planchais J, Vasseur-Cognet M, Fartoux L, Scatton O, Rosmorduc O, Guilmeau S, Postic C, Desdouets C, Desbois-Mouthon C, Burnol AF. Growth factor receptor binding protein 14 inhibition triggers insulin-induced mouse hepatocyte proliferation and is associated with hepatocellular carcinoma. Hepatology 2017; 65:1352-1368. [PMID: 27981611 DOI: 10.1002/hep.28972] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 11/16/2016] [Accepted: 12/06/2016] [Indexed: 12/14/2022]
Abstract
UNLABELLED Metabolic diseases such as obesity and type 2 diabetes are recognized as independent risk factors for hepatocellular carcinoma (HCC). Hyperinsulinemia, a hallmark of these pathologies, is suspected to be involved in HCC development. The molecular adapter growth factor receptor binding protein 14 (Grb14) is an inhibitor of insulin receptor catalytic activity, highly expressed in the liver. To study its involvement in hepatocyte proliferation, we specifically inhibited its liver expression using a short hairpin RNA strategy in mice. Enhanced insulin signaling upon Grb14 inhibition was accompanied by a transient induction of S-phase entrance by quiescent hepatocytes, indicating that Grb14 is a potent repressor of cell division. The proliferation of Grb14-deficient hepatocytes was cell-autonomous as it was also observed in primary cell cultures. Combined Grb14 down-regulation and insulin signaling blockade using pharmacological approaches as well as genetic mouse models demonstrated that Grb14 inhibition-mediated hepatocyte division involved insulin receptor activation and was mediated by the mechanistic target of rapamycin complex 1-S6K pathway and the transcription factor E2F1. In order to determine a potential dysregulation in GRB14 gene expression in human pathophysiology, a collection of 85 human HCCs was investigated. This revealed a highly significant and frequent decrease in GRB14 expression in hepatic tumors when compared to adjacent nontumoral parenchyma, with 60% of the tumors exhibiting a reduced Grb14 mRNA level. CONCLUSION Our study establishes Grb14 as a physiological repressor of insulin mitogenic action in the liver and further supports that dysregulation of insulin signaling is associated with HCC. (Hepatology 2017;65:1352-1368).
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Affiliation(s)
- Lucille Morzyglod
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
| | - Michèle Caüzac
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
| | - Lucie Popineau
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
| | - Pierre-Damien Denechaud
- Department of Physiology, University of Lausanne, Lausanne, Switzerland.,Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
| | - Lluis Fajas
- Department of Physiology, University of Lausanne, Lausanne, Switzerland.,Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland
| | - Bruno Ragazzon
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
| | - Véronique Fauveau
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
| | - Julien Planchais
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
| | - Mireille Vasseur-Cognet
- UMR IRD 242, UPEC, CNRS 7618, UPMC 113, INRA 1392, Paris, and Institut d'Ecologie et des Sciences de l'Environnement de Paris, Bondy, France.,Sorbonne Universités, Paris, France.,Institut National de la Santé et de la Recherche Médicale, Paris, France
| | - Laetitia Fartoux
- APHP, Hôpital La Pitié Salpêtrière, Service d'Hépato-Gastroentérologie, Paris, France.,Sorbonne Universités, UPMC Université Paris 06, INSERM, Centre de Recherche Saint-Antoine, Paris, France
| | - Olivier Scatton
- Sorbonne Universités, UPMC Université Paris 06, INSERM, Centre de Recherche Saint-Antoine, Paris, France.,APHP, Hôpital La Pitié-Salpêtrière, Service de Chirurgie Hépatobiliaire et Transplantation, Paris, France
| | - Olivier Rosmorduc
- APHP, Hôpital La Pitié Salpêtrière, Service d'Hépato-Gastroentérologie, Paris, France.,Sorbonne Universités, UPMC Université Paris 06, INSERM, Centre de Recherche Saint-Antoine, Paris, France
| | - Sandra Guilmeau
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
| | - Catherine Postic
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
| | - Chantal Desdouets
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
| | - Christèle Desbois-Mouthon
- Sorbonne Universités, UPMC Université Paris 06, INSERM, Centre de Recherche Saint-Antoine, Paris, France
| | - Anne-Françoise Burnol
- Inserm, U1016, Institut Cochin, Paris, France.,CNRS, UMR8104, Paris, France.,Université Paris Descartes, Sorbonne Paris Cité, France
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