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Hubel E, Neuman A, Fishman S, Schaffer O, Erez N, Shrkihe BA, Shteingard Y, Gross T, Shibolet O, Varol C, Zvibel I. Sortilin in biliary epithelial cells promotes ductular reaction and fibrosis during cholestatic injury. Am J Pathol 2024:S0002-9440(24)00087-7. [PMID: 38493927 DOI: 10.1016/j.ajpath.2024.01.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 01/03/2024] [Accepted: 01/29/2024] [Indexed: 03/19/2024]
Abstract
Cholestatic injuries are accompanied by a ductular reaction, initiated by proliferation and activation of biliary epithelial cells (BEC), leading to fibrosis. Sortilin (Sort1) facilitates IL-6 secretion and leukemia inhibitory factor (LIF) signaling. This study investigated the interplay between sortilin, IL-6 and LIF in cholestatic injury-induced ductular reaction, morphogenesis of new ducts and fibrosis. Cholestatic injury was induced by bile duct ligation (BDL) in WT and Sort1-/- mice, with or without augmentation of IL-6 or LIF. Mice with BEC sortilin deletion (HgfapcreSort1fl/fl) and controls were subjected to BDL and 3,5-Diethoxycarbonyl-1,4-Dihydrocollidine diet (DDC)-induced cholestatic injury. Sort1-/- mice displayed reduced BEC proliferation and expression of BEC reactive markers. Administration of LIF or IL-6 restored BEC proliferation in Sort1-/- mice, without affecting BEC reactive or inflammatory markers. Sort1-/- mice also displayed impaired morphogenesis, which was corrected by LIF treatment. Similarly, HgfapcreSort1fl/f mice exhibited reduced BEC proliferation, but similar expression of reactive and inflammatory markers. Serum IL-6 and LIF levels were comparable, yet liver pSTAT3 was reduced, indicating that sortilin is essential for co-activation of LIFR/gp130 signaling in BEC, but not for IL-6 secretion. Notably, HgfapcreSortfl/fl mice displayed impaired morphogenesis and diminished fibrosis following BDL and DDC. In conclusion, sortilin-governed engagement of LIF signaling in BEC promotes ductular reaction and morphogenesis during cholestatic injury. Moreover, BEC sortilin is pivotal for the development of fibrosis.
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Affiliation(s)
- Einav Hubel
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center and the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Anat Neuman
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center and the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Sigal Fishman
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center and the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Ortal Schaffer
- Department of Pediatric Surgery, Assaf Harofe Hospital, Tzrifin, Israel
| | - Noam Erez
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center and the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Bander Abu Shrkihe
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center and the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | | | - Tamar Gross
- Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Oren Shibolet
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center and the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Chen Varol
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center and the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Department of Clinical Microbiology and Immunology, Faculty of Medicine, Tel Aviv University.
| | - Isabel Zvibel
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center and the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
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Margalit Grigg L, Abu Shrkihe B, Efimova I, Solodeev I, Shteingard Y, Shani N, Zvibel I, Varol C. NLRP3 Deficiency in Nonimmune Cells Averts Obesity-Induced Fatty Liver Disease. J Transl Med 2024; 104:100308. [PMID: 38135154 DOI: 10.1016/j.labinv.2023.100308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 12/05/2023] [Accepted: 12/14/2023] [Indexed: 12/24/2023] Open
Abstract
Obesity predisposes to metabolic dysfunction-associated fatty liver disease (MAFLD), cardiovascular disease, and type 2 diabetes. Accumulating evidence suggests a complex role of NLR family pyrin domain containing 3 (NLRP3) inflammasome function in multiple manifestations of the metabolic syndrome, with contradictory results. Its broad expression and pleiotropic functions during obesity led us to investigate the contribution of its expression in nonimmune versus immune cells to the development of obesity and MAFLD. Bone marrow chimerism was used to target NLRP3 deficiency to immune (ImmuneΔNlrp3) versus nonimmune (NonimmuneΔNlrp3) cells. Irradiated WT mice reconstituted with WT bone marrow served as controls. Mice were fed a 60% high-fat diet for 16 weeks. NonimmuneΔNlrp3 mice gained less weight and displayed reduced liver and epididymal white adipose tissue (epiWAT) mass. They also exhibited reduced adipocyte hypertrophy and increased epiWAT adipogenesis and lipolysis. Notable was the diminished hepatic steatosis in NonimmuneΔNlrp3 livers, which persisted even following equilibration of their body weight to that of the control. This was accompanied by a decline in liver triglycerides and in expression of transcriptional modules involved with lipid uptake, storage, and de novo lipogenesis. Thermogenic pathways in brown adipose tissue were comparable to control mice, but an elevation was observed in the genes encoding for lipid transporters and fatty acid oxidation. In contrast, deletion of NLRP3 in the immune cell compartment had limited effects on obesity and hepatic steatosis. Collectively, our results outline a prominent role for NLRP3 in nonimmune cells in facilitating MAFLD during constant energy surplus.
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Affiliation(s)
- Lilah Margalit Grigg
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel; The Microsurgery and Plastic Surgery Lab, Department of Plastic and Reconstructive Surgery, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel
| | - Bander Abu Shrkihe
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel; Department of Clinical Microbiology and Immunology, School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Irina Efimova
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel; Department of Clinical Microbiology and Immunology, School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Inna Solodeev
- The Microsurgery and Plastic Surgery Lab, Department of Plastic and Reconstructive Surgery, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel
| | - Yuval Shteingard
- Department of Pathology, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel
| | - Nir Shani
- The Microsurgery and Plastic Surgery Lab, Department of Plastic and Reconstructive Surgery, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel
| | - Isabel Zvibel
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel
| | - Chen Varol
- The Research Center for Digestive Tract and Liver Diseases, Tel-Aviv Sourasky Medical Center, Tel-Aviv, Israel; Department of Clinical Microbiology and Immunology, School of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
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Affiliation(s)
- Yishay Szekely
- Department of Cardiology, Sourasky Tel Aviv Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Yael Lichter
- Department of Intensive Care, Sourasky Tel Aviv Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Bander Abu Shrkihe
- Department of Internal Medicine, Sourasky Tel Aviv Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Hila Bruck
- Department of Internal Medicine, Sourasky Tel Aviv Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Howard S Oster
- Department of Internal Medicine, Sourasky Tel Aviv Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Sami Viskin
- Department of Cardiology, Sourasky Tel Aviv Medical Center and Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
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