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Shen X, Mai R, Han X, Wang Q, Wang Y, Ji T, Tong Y, Chen P, Zhao J, He X, Wen T, Liang R, Lin Y, Luo X, Cai X. BTLA deficiency promotes HSC activation and protects against hepatic ischemia-reperfusion injury. Hepatol Commun 2024; 8:e0449. [PMID: 38840336 PMCID: PMC11155569 DOI: 10.1097/hc9.0000000000000449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Accepted: 03/07/2024] [Indexed: 06/07/2024] Open
Abstract
BACKGROUND AND AIMS Hepatic ischemia-reperfusion injury (IRI) is unavoidable even despite the development of more effective surgical approaches. During hepatic IRI, activated HSC (aHSC) are involved in liver injury and recovery. APPROACH AND RESULT A proportion of aHSC increased significantly both in the mouse liver tissues with IRI and in the primary mouse HSCs and LX-2 cells during hypoxia-reoxygenation. "Loss-of-function" experiments revealed that depleting aHSC with gliotoxin exacerbated liver damage in IRI mice. Subsequently, we found that the transcription of mRNA and the expression of B and T lymphocyte attenuator (BTLA) protein were lower in aHSC compared with quiescent HSCs. Interestingly, overexpression or knockdown of BTLA resulted in opposite changes in the activation of specific markers for HSCs such as collagen type I alpha 1, α-smooth muscle actin, and Vimentin. Moreover, the upregulation of these markers was also observed in the liver tissues of global BLTA-deficient (BTLA-/-) mice and was higher after hepatic IRI. Compared with wild-type mice, aHSC were higher, and liver injury was lower in BTLA-/- mice following IRI. However, the depletion of aHSC reversed these effects. In addition, the depletion of aHSC significantly exacerbated liver damage in BTLA-/- mice with hepatic IRI. Furthermore, the TGF-β1 signaling pathway was identified as a potential mechanism for BTLA to negatively regulate the activation of HSCs in vivo and in vitro. CONCLUSIONS These novel findings revealed a critical role of BTLA. Particularly, the receptor inhibits HSC-activated signaling in acute IRI, implying that it is a potential immunotherapeutic target for decreasing the IRI risk.
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Affiliation(s)
- Xiaoyun Shen
- Key Laboratory of Endoscopic Technology Research, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Rongyun Mai
- Department of Medical Oncology, Guangxi Medical University Cancer Hospital, Nanning, Guangxi, P.R. China
| | - Xiao Han
- Department of Medical Oncology, Guangxi Medical University Cancer Hospital, Nanning, Guangxi, P.R. China
| | - Qi Wang
- Key Laboratory of Endoscopic Technology Research, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Yifan Wang
- Key Laboratory of Endoscopic Technology Research, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Tong Ji
- Key Laboratory of Endoscopic Technology Research, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Yifan Tong
- Key Laboratory of Endoscopic Technology Research, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Ping Chen
- Key Laboratory of Endoscopic Technology Research, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Jia Zhao
- Key Laboratory of Endoscopic Technology Research, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Xiaoyan He
- Key Laboratory of Endoscopic Technology Research, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
| | - Tong Wen
- Department of Medical Oncology, Guangxi Medical University Cancer Hospital, Nanning, Guangxi, P.R. China
| | - Rong Liang
- Department of Medical Oncology, Guangxi Medical University Cancer Hospital, Nanning, Guangxi, P.R. China
| | - Yan Lin
- Department of Medical Oncology, Guangxi Medical University Cancer Hospital, Nanning, Guangxi, P.R. China
| | - Xiaoling Luo
- Department of Medical Oncology, Guangxi Medical University Cancer Hospital, Nanning, Guangxi, P.R. China
| | - Xiujun Cai
- Key Laboratory of Endoscopic Technology Research, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, P.R. China
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2
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Abstract
The fungal metabolite sporidesmin is responsible for the hepatogenous photosensitising disease facial eczema in livestock. Toxicity is due to a sulfur-bridged epidithiodioxopiperazine ring that has wide biological reactivity. The ways in which the toxin causes hepatobiliary and other tissue damage have not been established. Hypotheses include direct interaction with cellular thiols including protein cysteine residues or production of reactive oxygen species resulting in oxidative stress. Comparison with the cellular effects of the structurally related compound gliotoxin suggests additional mechanisms including interaction with cell adhesion complexes and possible downstream consequences for regulated necrosis as a response to tissue injury. Revision of hypotheses of how sporidesmin affects cells has the potential to generate new strategies for control of facial eczema including through identification of proteins and genes that are associated with resistance to the disease.
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Affiliation(s)
- T W Jordan
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
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3
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Participation of 5-lipoxygenase and LTB4 in liver regeneration after partial hepatectomy. Sci Rep 2019; 9:18176. [PMID: 31796842 PMCID: PMC6890767 DOI: 10.1038/s41598-019-54652-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 11/18/2019] [Indexed: 12/12/2022] Open
Abstract
Regeneration is the unmatched liver ability for recovering its functional mass after tissue lost. Leukotrienes (LT) are a family of eicosanoids with the capacity of signaling to promote proliferation. We analyzed the impact of blocking LT synthesis during liver regeneration after partial hepatectomy (PH). Male Wistar rats were subjected to two-third PH and treated with zileuton, a specific inhibitor of 5-lipoxygenase (5-LOX). Our first find was a significant increment of intrahepatic LTB4 during the first hour after PH together with an increase in 5-LOX expression. Zileuton reduced hepatic LTB4 levels at the moment of hepatectomy and also inhibited the increase in hepatic LTB4. This inhibition produced a delay in liver proliferation as seen by decreased PCNA and cyclin D1 nuclear expression 24 h post-PH. Results also showed that hepatic LTB4 diminution by zileuton was associated with a decrease in NF-ĸB activity. Additionally, decreased hepatic LTB4 levels by zileuton affected the recruitment of neutrophils and macrophages. Non-parenchymal cells (NPCs) from zileuton-treated PH-rats displayed higher apoptosis than NPCs from PH control rats. In conclusion, the present work provides evidences that 5-LOX activation and its product LTB4 are involved in the initial signaling events for liver regeneration after PH and the pharmacological inhibition of this enzyme can delay the initial time course of the phenomenon.
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4
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Kostallari E, Shah VH. Pericytes in the Liver. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2019; 1122:153-167. [PMID: 30937868 DOI: 10.1007/978-3-030-11093-2_9] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Liver pericytes, commonly named hepatic stellate cells (HSCs), reside in the space between liver sinusoidal endothelial cells (LSECs) and hepatocytes. They display important roles in health and disease. HSCs ensure the storage of the majority of vitamin A in a healthy body, and they represent the major source of fibrotic tissue in liver disease. Surrounding cells, such as LSECs, hepatocytes, and Kupffer cells, present a significant role in modulating HSC behavior. Therapeutic strategies against liver disease are being currently developed, where HSCs represent an ideal target. In this chapter, we will discuss HSC quiescence and activation in the context of healthy liver and diseases, such as fibrosis, steatohepatitis, and hepatocellular carcinoma.
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Affiliation(s)
- Enis Kostallari
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA
| | - Vijay H Shah
- Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA.
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5
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Konishi T, Schuster RM, Lentsch AB. Liver repair and regeneration after ischemia-reperfusion injury is associated with prolonged fibrosis. Am J Physiol Gastrointest Liver Physiol 2019; 316:G323-G331. [PMID: 30543462 PMCID: PMC6459287 DOI: 10.1152/ajpgi.00154.2018] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Liver recovery after hepatic ischemia-reperfusion (I/R) injury is characterized by clearance of dead tissue and its replacement with functional liver parenchyma. Previous reports have observed fibrosis after liver I/R. To determine whether liver fibrosis after I/R was a pathologic consequence of the injury response, we assessed the development of liver fibrosis after I/R and its impact on subsequent insult. A murine model of partial I/R was used to induce liver injury and study the reparative response. During liver remodeling after I/R, expression of the profibrotic genes increased in the ischemic liver. Histologically, α-smooth muscle actin (α-SMA)-positive hepatic stellate cells (HSCs)/myofibroblasts increased, and collagen deposition was enhanced along the injured site. Selective staining experiments showed that HSCs, not portal fibroblasts, were the major source of myofibroblasts. During liver repair after I/R, liver fibrosis was readily observed at the interface between necrotic tissue and regenerating liver in association with HSCs/myofibroblasts. The number of HSCs/myofibroblasts decreasing shortly after the full resolution of necrotic injury and restoration are normal liver architecture. However, liver fibrosis persisted for several more weeks before gradually resolving. Resolution of liver fibrosis was accompanied by upregulated expression of matrix metalloproteinase-13. After resolution of fibrosis, the administration of CCl4 did not result in exacerbated liver injury, suggesting that I/R injury does not predispose the liver to future fibrotic insults. The data suggest that liver fibrosis is a component of tissue repair after I/R, is caused by myofibroblasts derived from HSC, and does not increase susceptibility of the liver to subsequent hepatic injury. NEW & NOTEWORTHY This study is the first to assess pathology of liver fibrosis during the reparative process after ischemia-reperfusion (I/R) injury. Here we show that profibrotic gene expression increased in the liver after I/R, and collagen accumulation produced by hepatic stellate cells (HSCs)/myofibroblasts enhanced at the interface between necrotic tissue and regenerating liver. Liver fibrosis gradually resolved concomitant with decreasing activation of HSC and upregulating matrix metalloproteinase-13. After resolution of fibrosis, the liver was not more susceptible to subsequent hepatic injury.
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Affiliation(s)
- Takanori Konishi
- Department of Surgery, College of Medicine, University of Cincinnati, Cincinnati, Ohio
| | - Rebecca M. Schuster
- Department of Surgery, College of Medicine, University of Cincinnati, Cincinnati, Ohio
| | - Alex B. Lentsch
- Department of Surgery, College of Medicine, University of Cincinnati, Cincinnati, Ohio
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6
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Hubmann R, Sieghart W, Schnabl S, Araghi M, Hilgarth M, Reiter M, Demirtas D, Valent P, Zielinski C, Jäger U, Shehata M. Gliotoxin Targets Nuclear NOTCH2 in Human Solid Tumor Derived Cell Lines In Vitro and Inhibits Melanoma Growth in Xenograft Mouse Model. Front Pharmacol 2017; 8:319. [PMID: 28736522 PMCID: PMC5500618 DOI: 10.3389/fphar.2017.00319] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/15/2017] [Indexed: 12/04/2022] Open
Abstract
Deregulation of NOTCH2 signaling is implicated in a wide variety of human neoplasias. The current concept of targeting NOTCH is based on using gamma secretase inhibitors (GSI) to regulate the release of the active NOTCH intracellular domain. However, the clinical outcome of GSI remains unsatisfactory. Therefore we analyzed human solid tumor derived cell lines for their nuclear NOTCH activity and evaluated the therapeutic potential of the NOTCH2 transactivation inhibitor gliotoxin in comparison to the representative GSI DAPT. Electrophoretic mobility shift assays (EMSA) were used as a surrogate method for the detection of NOTCH/CSL transcription factor complexes. The effect of gliotoxin on cell viability and its clinical relevance was evaluated in vitro and in a melanoma xenograft mouse model. Cell lines derived from melanoma (518A2), hepatocellular carcinoma (SNU398, HCC-3, Hep3B), and pancreas carcinoma (PANC1) express high amounts of nuclear NOTCH2. Gliotoxin efficiently induced apoptosis in these cell lines whereas the GSI DAPT was ineffective. The specificity of gliotoxin was demonstrated in the well differentiated nuclear NOTCH negative cell line Huh7, which was resistant to gliotoxin treatment in vitro. In xenotransplanted 518A2 melanomas, a single day dosing schedule of gliotoxin was well tolerated without any study limiting side effects. Gliotoxin significantly reduced the tumor volume in early (83 mm3 vs. 115 mm3, p = 0.008) as well as in late stage (218 mm3 vs. 576 mm3, p = 0.005) tumor models. In conclusion, NOTCH2 appears to be a key target of gliotoxin in human neoplasias and gliotoxin deserves further evaluation as a potential therapeutic agent in cancer management.
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Affiliation(s)
- Rainer Hubmann
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria
| | - Wolfgang Sieghart
- Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Medical University of ViennaVienna, Austria
| | - Susanne Schnabl
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria
| | - Mohammad Araghi
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria
| | - Martin Hilgarth
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria
| | - Marlies Reiter
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria
| | - Dita Demirtas
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria
| | - Peter Valent
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria.,Department of Medicine I, Ludwig Boltzmann Cluster Oncology, Medical University of ViennaVienna, Austria
| | - Christoph Zielinski
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria.,Comprehensive Cancer Center Vienna, Drug and Target Screening Unit, Medical University of ViennaVienna, Austria
| | - Ulrich Jäger
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria.,Comprehensive Cancer Center Vienna, Drug and Target Screening Unit, Medical University of ViennaVienna, Austria
| | - Medhat Shehata
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of ViennaVienna, Austria.,Comprehensive Cancer Center Vienna, Drug and Target Screening Unit, Medical University of ViennaVienna, Austria
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7
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Abstract
Liver possesses many critical functions such as synthesis, detoxification, and metabolism. It continually receives nutrient-rich blood from gut, which incidentally is also toxin-rich. That may be why liver is uniquely bestowed with a capacity to regenerate. A commonly studied procedure to understand the cellular and molecular basis of liver regeneration is that of surgical resection. Removal of two-thirds of the liver in rodents or patients instigates alterations in hepatic homeostasis, which are sensed by the deficient organ to drive the restoration process. Although the exact mechanisms that initiate regeneration are unknown, alterations in hemodynamics and metabolism have been suspected as important effectors. Key signaling pathways are activated that drive cell proliferation in various hepatic cell types through autocrine and paracrine mechanisms. Once the prehepatectomy mass is regained, the process of regeneration is adequately terminated. This review highlights recent discoveries in the cellular and molecular basis of liver regeneration.
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Affiliation(s)
- Morgan E. Preziosi
- Division of Experimental Pathology, Department of Pathology, University of Pittsburgh, School of Medicine and University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania,Pittsburgh Liver Research Center, University of Pittsburgh, School of Medicine and University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
| | - Satdarshan P. Monga
- Division of Experimental Pathology, Department of Pathology, University of Pittsburgh, School of Medicine and University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania,Pittsburgh Liver Research Center, University of Pittsburgh, School of Medicine and University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania,Division of Gastroenterology, Hepatology and Nutrition, Department of Medicine, University of Pittsburgh, School of Medicine and University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
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8
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Hepatic stellate cells: fibrogenic, regenerative or both? Heterogeneity and context are key. Hepatol Int 2016; 10:902-908. [PMID: 27578210 DOI: 10.1007/s12072-016-9758-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 07/29/2016] [Indexed: 12/24/2022]
Abstract
Since their original identification, our understanding of the role of hepatic stellate cells in both health and disease continues to grow. Numerous studies have delineated the role of stellate cell activation in contributing to the pool of myofibroblasts responsible for liver fibrosis, and these have resulted in the development of a number of anti-fibrotic strategies targeting this cell. However, their potential role in liver regeneration, both initiation and termination, is also emerging and needs to be contemplated when considering targeted therapy. Perhaps what is most striking is the increasing recognition that this is not just one cell, but rather, a heterogenous population made up of a number of different subsets of cells, each with differentiated and specific functions. The tools are emerging for this dissection and are greatly needed to truly develop targeted therapies that will inhibit fibrosis while promoting liver regeneration and repair.
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9
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Kocabayoglu P, Zhang DY, Kojima K, Hoshida Y, Friedman SL. Induction and contribution of beta platelet-derived growth factor signalling by hepatic stellate cells to liver regeneration after partial hepatectomy in mice. Liver Int 2016; 36:874-82. [PMID: 26256287 PMCID: PMC4749477 DOI: 10.1111/liv.12933] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Accepted: 08/04/2015] [Indexed: 12/19/2022]
Abstract
BACKGROUND & AIMS Hepatic stellate cells (HSCs) activate during injury to orchestrate the liver's inflammatory and fibrogenic responses. A critical feature of HSC activation is the rapid induction of beta platelet-derived growth factor (β-PDGFR), which drives cellular fibrogenesis and proliferation; in contrast, normal liver has minimal β-PDGFR expression. While the role of β-PDGFR is well established in liver injury, its expression and contribution during liver regeneration are unknown. The aim of this study was to determine whether β-PDGFR is induced during liver regeneration following partial hepatectomy (pHx), and to define its contribution to the regenerative response. METHODS Control mice or animals with HSC-specific β-PDGFR-depletion underwent two-thirds pHx followed by assessment of hepatocyte proliferation and expression of β-PDGFR. RNA-sequencing from whole liver tissue of both groups after pHx was used to uncover pathways regulated by β-PDGFR signalling in HSCs. RESULTS Beta platelet-derived growth factor expression on HSCs was up-regulated within 24 h following pHx in control mice, whereas absence of β-PDGFR blunted the expansion of HSCs. Mice lacking β-PDGFR displayed prolonged increases of transaminase levels within 72 h following pHx. Hepatocyte proliferation was impaired within the first 24 h based on Ki-67 and PCNA expression in β-PDGFR-deficient mice. This was associated with dysregulated growth in the β-PDGFR-deficient mice based on RNAseq with pathway analysis, and real-time quantitative PCR, which demonstrated reduced expression of Hgf, Igfbp1, Mapk and Il-6. CONCLUSIONS Beta platelet-derived growth factor is induced in HSCs following surgical pHx and its deletion in HSCs leads to prolonged liver injury. However, there is no significant difference in liver regeneration.
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Affiliation(s)
- Peri Kocabayoglu
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA,Department of General, Visceral and Transplant Surgery, University Hospital Essen, Germany
| | - David Y. Zhang
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Kensuke Kojima
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Yujin Hoshida
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA,Liver Cancer Program, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Scott L. Friedman
- Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA,Liver Cancer Program, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY
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10
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Hu C, Li L. In vitro culture of isolated primary hepatocytes and stem cell-derived hepatocyte-like cells for liver regeneration. Protein Cell 2015; 6:562-74. [PMID: 26088193 PMCID: PMC4506286 DOI: 10.1007/s13238-015-0180-2] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 05/25/2015] [Indexed: 02/07/2023] Open
Abstract
Various liver diseases result in terminal hepatic failure, and liver transplantation, cell transplantation and artificial liver support systems are emerging as effective therapies for severe hepatic disease. However, all of these treatments are limited by organ or cell resources, so developing a sufficient number of functional hepatocytes for liver regeneration is a priority. Liver regeneration is a complex process regulated by growth factors (GFs), cytokines, transcription factors (TFs), hormones, oxidative stress products, metabolic networks, and microRNA. It is well-known that the function of isolated primary hepatocytes is hard to maintain; when cultured in vitro, these cells readily undergo dedifferentiation, causing them to lose hepatocyte function. For this reason, most studies focus on inducing stem cells, such as embryonic stem cells (ESCs), induced pluripotent stem cells (iPSCs), hepatic progenitor cells (HPCs), and mesenchymal stem cells (MSCs), to differentiate into hepatocyte-like cells (HLCs) in vitro. In this review, we mainly focus on the nature of the liver regeneration process and discuss how to maintain and enhance in vitro hepatic function of isolated primary hepatocytes or stem cell-derived HLCs for liver regeneration. In this way, hepatocytes or HLCs may be applied for clinical use for the treatment of terminal liver diseases and may prolong the survival time of patients in the near future.
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Affiliation(s)
- Chenxia Hu
- Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, School of Medicine, First Affiliated Hospital, Zhejiang University, Hangzhou, 310006, China
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11
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Phenotypic Changes in Hepatic Stellate Cells in Response to Toxic Liver Injury. CURRENT PATHOBIOLOGY REPORTS 2014. [DOI: 10.1007/s40139-014-0051-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Yang J, Mowry LE, Nejak-Bowen KN, Okabe H, R. Diegel C, Lang RA, Williams BO, Monga SP. β-catenin signaling in murine liver zonation and regeneration: a Wnt-Wnt situation! Hepatology 2014; 60:964-76. [PMID: 24700412 PMCID: PMC4139486 DOI: 10.1002/hep.27082] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2013] [Accepted: 02/18/2014] [Indexed: 12/14/2022]
Abstract
UNLABELLED Liver-specific β-catenin knockout (β-Catenin-LKO) mice have revealed an essential role of β-catenin in metabolic zonation where it regulates pericentral gene expression and in initiating liver regeneration (LR) after partial hepatectomy (PH), by regulating expression of Cyclin-D1. However, what regulates β-catenin activity in these events remains an enigma. Here we investigate to what extent β-catenin activation is Wnt-signaling-dependent and the potential cell source of Wnts. We studied liver-specific Lrp5/6 KO (Lrp-LKO) mice where Wnt-signaling was abolished in hepatocytes while the β-catenin gene remained intact. Intriguingly, like β-catenin-LKO mice, Lrp-LKO exhibited a defect in metabolic zonation observed as a lack of glutamine synthetase (GS), Cyp1a2, and Cyp2e1. Lrp-LKO also displayed a significant delay in initiation of LR due to the absence of β-catenin-TCF4 association and lack of Cyclin-D1. To address the source of Wnt proteins in liver, we investigated conditional Wntless (Wls) KO mice, which lacked the ability to secrete Wnts from either liver epithelial cells (Wls-LKO), or macrophages including Kupffer cells (Wls-MKO), or endothelial cells (Wls-EKO). While Wls-EKO was embryonic lethal precluding further analysis in adult hepatic homeostasis and growth, Wls-LKO and Wls-MKO were viable but did not show any defect in hepatic zonation. Wls-LKO showed normal initiation of LR; however, Wls-MKO showed a significant but temporal deficit in LR that was associated with decreased β-catenin-TCF4 association and diminished Cyclin-D1 expression. CONCLUSION Wnt-signaling is the major upstream effector of β-catenin activity in pericentral hepatocytes and during LR. Hepatocytes, cholangiocytes, or macrophages are not the source of Wnts in regulating hepatic zonation. However, Kupffer cells are a major contributing source of Wnt secretion necessary for β-catenin activation during LR.
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Affiliation(s)
- Jing Yang
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Laura E. Mowry
- Lab of Cell Signaling and Carcinogenesis, Van Andel Research Institute, Grant Rapids, MI
| | | | - Hirohisa Okabe
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Cassandra R. Diegel
- Lab of Cell Signaling and Carcinogenesis, Van Andel Research Institute, Grant Rapids, MI
| | - Richard A. Lang
- Department of Pediatrics, Cincinnati Childrens, Cincinnati, OH
| | - Bart O. Williams
- Lab of Cell Signaling and Carcinogenesis, Van Andel Research Institute, Grant Rapids, MI
| | - Satdarshan P Monga
- Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA,Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA,Address correspondence to: Satdarshan Pal Singh Monga, MD, Vice Chair of Experimental Pathology, Endowed Chair of Experimental Pathology, Professor of Pathology & Medicine (GI, Hepatology & Nutrition), University of Pittsburgh School of Medicine, 200 Lothrop Street S-422 BST, Pittsburgh, PA 15261; Tel: (412) 648-9966; Fax: (412) 648-1916;
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