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Andrabi SM, Sharma NS, Karan A, Shahriar SMS, Cordon B, Ma B, Xie J. Nitric Oxide: Physiological Functions, Delivery, and Biomedical Applications. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2303259. [PMID: 37632708 PMCID: PMC10602574 DOI: 10.1002/advs.202303259] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Indexed: 08/28/2023]
Abstract
Nitric oxide (NO) is a gaseous molecule that has a central role in signaling pathways involved in numerous physiological processes (e.g., vasodilation, neurotransmission, inflammation, apoptosis, and tumor growth). Due to its gaseous form, NO has a short half-life, and its physiology role is concentration dependent, often restricting its function to a target site. Providing NO from an external source is beneficial in promoting cellular functions and treatment of different pathological conditions. Hence, the multifaceted role of NO in physiology and pathology has garnered massive interest in developing strategies to deliver exogenous NO for the treatment of various regenerative and biomedical complexities. NO-releasing platforms or donors capable of delivering NO in a controlled and sustained manner to target tissues or organs have advanced in the past few decades. This review article discusses in detail the generation of NO via the enzymatic functions of NO synthase as well as from NO donors and the multiple biological and pathological processes that NO modulates. The methods for incorporating of NO donors into diverse biomaterials including physical, chemical, or supramolecular techniques are summarized. Then, these NO-releasing platforms are highlighted in terms of advancing treatment strategies for various medical problems.
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Affiliation(s)
- Syed Muntazir Andrabi
- Department of Surgery‐Transplant and Mary & Dick Holland Regenerative Medicine ProgramCollege of MedicineUniversity of Nebraska Medical CenterOmahaNE68198USA
| | - Navatha Shree Sharma
- Department of Surgery‐Transplant and Mary & Dick Holland Regenerative Medicine ProgramCollege of MedicineUniversity of Nebraska Medical CenterOmahaNE68198USA
| | - Anik Karan
- Department of Surgery‐Transplant and Mary & Dick Holland Regenerative Medicine ProgramCollege of MedicineUniversity of Nebraska Medical CenterOmahaNE68198USA
| | - S. M. Shatil Shahriar
- Department of Surgery‐Transplant and Mary & Dick Holland Regenerative Medicine ProgramCollege of MedicineUniversity of Nebraska Medical CenterOmahaNE68198USA
| | - Brent Cordon
- Department of Surgery‐Transplant and Mary & Dick Holland Regenerative Medicine ProgramCollege of MedicineUniversity of Nebraska Medical CenterOmahaNE68198USA
| | - Bing Ma
- Cell Therapy Manufacturing FacilityMedStar Georgetown University HospitalWashington, DC2007USA
| | - Jingwei Xie
- Department of Surgery‐Transplant and Mary & Dick Holland Regenerative Medicine ProgramCollege of MedicineUniversity of Nebraska Medical CenterOmahaNE68198USA
- Department of Mechanical and Materials EngineeringCollege of EngineeringUniversity of Nebraska LincolnLincolnNE68588USA
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Wu Y, Li N, Shu X, Li W, Zhang X, Lü D, Long M. Biomechanics in liver regeneration after partial hepatectomy. Front Bioeng Biotechnol 2023; 11:1165651. [PMID: 37214300 PMCID: PMC10196191 DOI: 10.3389/fbioe.2023.1165651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 04/18/2023] [Indexed: 05/24/2023] Open
Abstract
The liver is a complicated organ within the body that performs wide-ranging and vital functions and also has a unique regenerative capacity after hepatic tissue injury and cell loss. Liver regeneration from acute injury is always beneficial and has been extensively studied. Experimental models including partial hepatectomy (PHx) reveal that extracellular and intracellular signaling pathways can help the liver recover to its equivalent size and weight prior to an injury. In this process, mechanical cues possess immediate and drastic changes in liver regeneration after PHx and also serve as main triggering factors and significant driving forces. This review summarized the biomechanics progress in liver regeneration after PHx, mainly focusing on PHx-based hemodynamics changes in liver regeneration and the decoupling of mechanical forces in hepatic sinusoids including shear stress, mechanical stretch, blood pressure, and tissue stiffness. Also discussed were the potential mechanosensors, mechanotransductive pathways, and mechanocrine responses under varied mechanical loading in vitro. Further elucidating these mechanical concepts in liver regeneration helps establish a comprehensive understanding of the biochemical factors and mechanical cues in this process. Proper adjustment of mechanical loading within the liver might preserve and restore liver functions in clinical settings, serving as an effective therapy for liver injury and diseases.
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Affiliation(s)
- Yi Wu
- Center for Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology and Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Ning Li
- Center for Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology and Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Xinyu Shu
- Center for Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology and Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Wang Li
- Center for Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology and Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Xiaoyu Zhang
- Center for Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology and Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Dongyuan Lü
- Center for Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology and Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Mian Long
- Center for Biomechanics and Bioengineering, Beijing Key Laboratory of Engineered Construction and Mechanobiology and Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
- School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, China
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Späth MR, Hoyer-Allo KJR, Seufert L, Höhne M, Lucas C, Bock T, Isermann L, Brodesser S, Lackmann JW, Kiefer K, Koehler FC, Bohl K, Ignarski M, Schiller P, Johnsen M, Kubacki T, Grundmann F, Benzing T, Trifunovic A, Krüger M, Schermer B, Burst V, Müller RU. Organ Protection by Caloric Restriction Depends on Activation of the De Novo NAD+ Synthesis Pathway. J Am Soc Nephrol 2023; 34:772-792. [PMID: 36758124 PMCID: PMC10125653 DOI: 10.1681/asn.0000000000000087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Accepted: 01/10/2023] [Indexed: 02/11/2023] Open
Abstract
SIGNIFICANCE STATEMENT AKI is a major clinical complication leading to high mortality, but intensive research over the past decades has not led to targeted preventive or therapeutic measures. In rodent models, caloric restriction (CR) and transient hypoxia significantly prevent AKI and a recent comparative transcriptome analysis of murine kidneys identified kynureninase (KYNU) as a shared downstream target. The present work shows that KYNU strongly contributes to CR-mediated protection as a key player in the de novo nicotinamide adenine dinucleotide biosynthesis pathway. Importantly, the link between CR and NAD+ biosynthesis could be recapitulated in a human cohort. BACKGROUND Clinical practice lacks strategies to treat AKI. Interestingly, preconditioning by hypoxia and caloric restriction (CR) is highly protective in rodent AKI models. However, the underlying molecular mechanisms of this process are unknown. METHODS Kynureninase (KYNU) knockout mice were generated by Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) and comparative transcriptome, proteome and metabolite analyses of murine kidneys pre- and post-ischemia-reperfusion injury in the context of CR or ad libitum diet were performed. In addition, acetyl-lysin enrichment and mass spectrometry were used to assess protein acetylation. RESULTS We identified KYNU as a downstream target of CR and show that KYNU strongly contributes to the protective effect of CR. The KYNU-dependent de novo nicotinamide adenine dinucleotide (NAD+) biosynthesis pathway is necessary for CR-associated maintenance of NAD+ levels. This finding is associated with reduced protein acetylation in CR-treated animals, specifically affecting enzymes in energy metabolism. Importantly, the effect of CR on de novo NAD+ biosynthesis pathway metabolites can be recapitulated in humans. CONCLUSIONS CR induces the de novo NAD+ synthesis pathway in the context of IRI and is essential for its full nephroprotective potential. Differential protein acetylation may be the molecular mechanism underlying the relationship of NAD+, CR, and nephroprotection.
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Affiliation(s)
- Martin R. Späth
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - K. Johanna R. Hoyer-Allo
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Lisa Seufert
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Martin Höhne
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Christina Lucas
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Theresa Bock
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- Institute of Genetics, University of Cologne, Cologne, Germany
| | - Lea Isermann
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- Medical Faculty, Institute for Mitochondrial Diseases and Aging, University of Cologne, Cologne, Germany
- Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Susanne Brodesser
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Jan-Wilm Lackmann
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Katharina Kiefer
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Felix C. Koehler
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Katrin Bohl
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Michael Ignarski
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Petra Schiller
- Institute of Medical Statistics and Computational Biology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Marc Johnsen
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Torsten Kubacki
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Franziska Grundmann
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Thomas Benzing
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Aleksandra Trifunovic
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- Medical Faculty, Institute for Mitochondrial Diseases and Aging, University of Cologne, Cologne, Germany
- Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Marcus Krüger
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- Institute of Genetics, University of Cologne, Cologne, Germany
- Center for Molecular Medicine (CMMC), University of Cologne, Cologne, Germany
| | - Bernhard Schermer
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Volker Burst
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- Emergency Department, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Roman-Ulrich Müller
- Department II of Internal Medicine and Center for Molecular Medicine Cologne, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
- CECAD, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany
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Caloric restriction reduces the pro-inflammatory eicosanoid 20- hydroxyeicosatetraenoic acid to protect from acute kidney injury. Kidney Int 2022; 102:560-576. [PMID: 35654224 DOI: 10.1016/j.kint.2022.04.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 04/13/2022] [Accepted: 04/22/2022] [Indexed: 11/22/2022]
Abstract
Acute kidney injury is a frequent complication in the clinical setting and associated with significant morbidity and mortality. Preconditioning with short-term caloric restriction is highly protective against kidney injury in rodent ischemia reperfusion injury models. However, the underlying mechanisms are unknown hampering clinical translation. Here, we examined the molecular basis of caloric restriction-mediated protection to elucidate the principles of kidney stress resistance. Analysis of an RNAseq dataset after caloric restriction identified Cyp4a12a, a cytochrome exclusively expressed in male mice, to be strongly downregulated after caloric restriction. Kidney ischemia reperfusion injury robustly induced acute kidney injury in male mice and this damage could be markedly attenuated by pretreatment with caloric restriction. In females, damage was significantly less pronounced and preconditioning with caloric restriction had only little effect. Tissue concentrations of the metabolic product of Cyp4a12a, 20-hydroxyeicosatetraenoic acid (20-HETE), were found to be significantly reduced by caloric restriction. Conversely, intraperitoneal supplementation of 20-HETE in preconditioned males partly abrogated the protective potential of caloric restriction. Interestingly, this effect was accompanied by a partial reversal of caloric restriction-induced changes in protein but not RNA expression pointing towards inflammation, endoplasmic reticulum stress and lipid metabolism. Thus, our findings provide an insight into the mechanisms underlying kidney protection by caloric restriction. Hence, understanding the mediators of preconditioning is an important pre-requisite for moving towards translation to the clinical setting.
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Hadjittofi C, Feretis M, Martin J, Harper S, Huguet E. Liver regeneration biology: Implications for liver tumour therapies. World J Clin Oncol 2021; 12:1101-1156. [PMID: 35070734 PMCID: PMC8716989 DOI: 10.5306/wjco.v12.i12.1101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 06/22/2021] [Accepted: 11/28/2021] [Indexed: 02/06/2023] Open
Abstract
The liver has remarkable regenerative potential, with the capacity to regenerate after 75% hepatectomy in humans and up to 90% hepatectomy in some rodent models, enabling it to meet the challenge of diverse injury types, including physical trauma, infection, inflammatory processes, direct toxicity, and immunological insults. Current understanding of liver regeneration is based largely on animal research, historically in large animals, and more recently in rodents and zebrafish, which provide powerful genetic manipulation experimental tools. Whilst immensely valuable, these models have limitations in extrapolation to the human situation. In vitro models have evolved from 2-dimensional culture to complex 3 dimensional organoids, but also have shortcomings in replicating the complex hepatic micro-anatomical and physiological milieu. The process of liver regeneration is only partially understood and characterized by layers of complexity. Liver regeneration is triggered and controlled by a multitude of mitogens acting in autocrine, paracrine, and endocrine ways, with much redundancy and cross-talk between biochemical pathways. The regenerative response is variable, involving both hypertrophy and true proliferative hyperplasia, which is itself variable, including both cellular phenotypic fidelity and cellular trans-differentiation, according to the type of injury. Complex interactions occur between parenchymal and non-parenchymal cells, and regeneration is affected by the status of the liver parenchyma, with differences between healthy and diseased liver. Finally, the process of termination of liver regeneration is even less well understood than its triggers. The complexity of liver regeneration biology combined with limited understanding has restricted specific clinical interventions to enhance liver regeneration. Moreover, manipulating the fundamental biochemical pathways involved would require cautious assessment, for fear of unintended consequences. Nevertheless, current knowledge provides guiding principles for strategies to optimise liver regeneration potential.
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Affiliation(s)
- Christopher Hadjittofi
- University Department of Surgery, Addenbrookes Hospital, NIHR Comprehensive Biomedical Research and Academic Health Sciences Center, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, United Kingdom
| | - Michael Feretis
- University Department of Surgery, Addenbrookes Hospital, NIHR Comprehensive Biomedical Research and Academic Health Sciences Center, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, United Kingdom
| | - Jack Martin
- University Department of Surgery, Addenbrookes Hospital, NIHR Comprehensive Biomedical Research and Academic Health Sciences Center, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, United Kingdom
| | - Simon Harper
- University Department of Surgery, Addenbrookes Hospital, NIHR Comprehensive Biomedical Research and Academic Health Sciences Center, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, United Kingdom
| | - Emmanuel Huguet
- University Department of Surgery, Addenbrookes Hospital, NIHR Comprehensive Biomedical Research and Academic Health Sciences Center, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, United Kingdom
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Ogasawara H, Inagaki A, Fathi I, Imura T, Yamana H, Saitoh Y, Matsumura M, Fukuoka K, Miyagi S, Nakamura Y, Ohashi K, Unno M, Kamei T, Goto M. Preferable Transplant Site for Hepatocyte Transplantation in a Rat Model. Cell Transplant 2021; 30:9636897211040012. [PMID: 34525872 PMCID: PMC8450989 DOI: 10.1177/09636897211040012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Intraportal injection is regarded as the current standard procedure of hepatocyte transplantation (HTx). In islet transplantation, which shares many aspects with HTx, recent studies have clarified that instant blood-mediated inflammatory reaction (IBMIR), characterized by strong innate immune responses, can cause poor engraftment, so other transplant sites to avoid such a reaction have been established. Although IBMIR was reported to occur in HTx, few reports have evaluated alternative transplant sites for HTx. In this study, we sought to determine the optimum transplant site for HTx. Rat hepatocytes (1.0 × 107) were transplanted at the 9 transplant sites (intraportal (IPO), intrasplenic (IS), liver parenchyma, subcutaneous, intraperitoneal, renal subcapsular, muscle, inguinal subcutaneous white adipose tissue, and omentum) of analbuminemic rats. The serum albumin levels, immunohistochemical staining (albumin, TUNEL, and BrdU), and in vivo imaging of the grafts were evaluated. The serum albumin levels of the IPO group were significantly higher than those of the other groups (p < .0001). The BrdU-positive hepatocyte ratio of liver in the IS group (0.9% ± 0.2%) was comparable to that of the IPO group (0.9% ± 0.3%) and tended to be higher than that of the spleen in the IS group (0.5% ± 0.1%, p = .16). Considering the in vivo imaging evaluation and the influence of splenectomy, the graft function in the IS group may be almost entirely achieved by hepatocytes that have migrated to the liver. The present study clearly showed that the intraportal injection procedure is more efficient than other procedures for performing HTx
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Affiliation(s)
- Hiroyuki Ogasawara
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Akiko Inagaki
- Division of Transplantation and Regenerative Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Ibrahim Fathi
- Division of Transplantation and Regenerative Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Takehiro Imura
- Division of Transplantation and Regenerative Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hiroki Yamana
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Yoshikatsu Saitoh
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Muneyuki Matsumura
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kengo Fukuoka
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Shigehito Miyagi
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Yasuhiro Nakamura
- Division of Pathology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Kazuo Ohashi
- Laboratory of Drug Development and Science, Graduate School of Pharmaceutical Sciences, Osaka University, Osaka, Japan
| | - Michiaki Unno
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Takashi Kamei
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Masafumi Goto
- Department of Surgery, Tohoku University Graduate School of Medicine, Sendai, Japan.,Division of Transplantation and Regenerative Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
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Guerin DJ, Kha CX, Tseng KAS. From Cell Death to Regeneration: Rebuilding After Injury. Front Cell Dev Biol 2021; 9:655048. [PMID: 33816506 PMCID: PMC8012889 DOI: 10.3389/fcell.2021.655048] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 02/22/2021] [Indexed: 12/22/2022] Open
Abstract
The ability to regrow lost or damaged tissues is widespread, but highly variable among animals. Understanding this variation remains a challenge in regeneration biology. Numerous studies from Hydra to mouse have shown that apoptosis acts as a potent and necessary mechanism in regeneration. Much is known about the involvement of apoptosis during normal development in regulating the number and type of cells in the body. In the context of regeneration, apoptosis also regulates cell number and proliferation in tissue remodeling. Apoptosis acts both early in the process to stimulate regeneration and later to regulate regenerative patterning. Multiple studies indicate that apoptosis acts as a signal to stimulate proliferation within the regenerative tissues, producing the cells needed for full regeneration. The conservation of apoptosis as a regenerative mechanism demonstrated across species highlights its importance and motivates the continued investigation of this important facet of programmed cell death. This review summarizes what is known about the roles of apoptosis during regeneration, and compares regenerative apoptosis with the mechanisms and function of apoptosis in development. Defining the complexity of regenerative apoptosis will contribute to new knowledge and perspectives for understanding mechanisms of apoptosis induction and regulation.
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Affiliation(s)
- Dylan J Guerin
- School of Life Sciences, University of Nevada, Las Vegas, Las Vegas, NV, United States
| | - Cindy X Kha
- School of Life Sciences, University of Nevada, Las Vegas, Las Vegas, NV, United States
| | - Kelly Ai-Sun Tseng
- School of Life Sciences, University of Nevada, Las Vegas, Las Vegas, NV, United States
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Improving Liver Graft Function Using CD47 Blockade in the Setting of Normothermic Machine Perfusion. Transplantation 2021; 106:37-47. [PMID: 33577253 DOI: 10.1097/tp.0000000000003688] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Towards the goal of utilizing more livers for transplantation, transplant centers are looking to increase the use of organs from "marginal" donors. Livers from these donors, however, have been shown to be more susceptible to preservation and reperfusion injury. METHODS Using a porcine model of donation after circulatory death (DCD), we studied the use of antibody-mediated CD47 blockade to further improve liver graft function undergoing normothermic machine perfusion. Livers from 20 pigs (5 per group) were brought under either 30 or 60 minutes of warm ischemia time (WIT) followed by the administration of CD47mAb treatment or IgG control antibodies and 6 hours of normothermic extracorporeal liver perfusion (NELP). RESULTS After 6 hours of NELP, CD47mAb-treated livers with 30 or 60 minutes WIT had significantly lower ALT levels and higher bile production compared to their respective control groups. Blockade of the CD47 signaling pathway resulted in significantly lower TSP-1 protein levels, lower expression of Caspase-3, and higher expression of pERK. CONCLUSIONS These findings suggested that CD47mAb treatment decreases ischemia/reperfusion injury through CD47/TSP-1 signaling downregulation and the presence of necrosis/apoptosis after reperfusion, and could increase liver regeneration during normothermic perfusion of the liver.Supplemental Visual Abstract; http://links.lww.com/TP/C146.
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Yagi S, Hirata M, Miyachi Y, Uemoto S. Liver Regeneration after Hepatectomy and Partial Liver Transplantation. Int J Mol Sci 2020; 21:ijms21218414. [PMID: 33182515 PMCID: PMC7665117 DOI: 10.3390/ijms21218414] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 11/04/2020] [Accepted: 11/05/2020] [Indexed: 02/07/2023] Open
Abstract
The liver is a unique organ with an abundant regenerative capacity. Therefore, partial hepatectomy (PHx) or partial liver transplantation (PLTx) can be safely performed. Liver regeneration involves a complex network of numerous hepatotropic factors, cytokines, pathways, and transcriptional factors. Compared with liver regeneration after a viral- or drug-induced liver injury, that of post-PHx or -PLTx has several distinct features, such as hemodynamic changes in portal venous flow or pressure, tissue ischemia/hypoxia, and hemostasis/platelet activation. Although some of these changes also occur during liver regeneration after a viral- or drug-induced liver injury, they are more abrupt and drastic following PHx or PLTx, and can thus be the main trigger and driving force of liver regeneration. In this review, we first provide an overview of the molecular biology of liver regeneration post-PHx and -PLTx. Subsequently, we summarize some clinical conditions that negatively, or sometimes positively, interfere with liver regeneration after PHx or PLTx, such as marginal livers including aged or fatty liver and the influence of immunosuppression.
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Ikeda N, Asano K, Kikuchi K, Uchida Y, Ikegami H, Takagi R, Yotsumoto S, Shibuya T, Makino-Okamura C, Fukuyama H, Watanabe T, Ohmuraya M, Araki K, Nishitai G, Tanaka M. Emergence of immunoregulatory Ym1 +Ly6C hi monocytes during recovery phase of tissue injury. Sci Immunol 2019; 3:3/28/eaat0207. [PMID: 30291130 DOI: 10.1126/sciimmunol.aat0207] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 05/25/2018] [Accepted: 09/04/2018] [Indexed: 12/12/2022]
Abstract
Ly6Chi monocytes migrate to injured sites and induce inflammation in the acute phase of tissue injury. However, once the causes of tissue injury are eliminated, monocyte-derived macrophages contribute to the resolution of inflammation and tissue repair. It remains unclear whether the emergence of these immunoregulatory macrophages is attributed to the phenotypic conversion of inflammatory monocytes in situ or to the recruitment of bone marrow-derived regulatory cells de novo. Here, we identified a subpopulation of Ly6Chi monocytes that contribute to the resolution of inflammation and tissue repair. Ym1+Ly6Chi monocytes greatly expanded in bone marrow during the recovery phase of systemic inflammation or tissue injury. Ym1+Ly6Chi monocytes infiltrating into an injured site exhibited immunoregulatory and tissue-reparative phenotypes. Deletion of Ym1+Ly6Chi monocytes resulted in delayed recovery from colitis. These results demonstrate that a distinct monocyte subpopulation destined to act in immunoregulation is generated in bone marrow and participates in resolution of inflammation and tissue repair.
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Affiliation(s)
- Naoki Ikeda
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
| | - Kenichi Asano
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
| | - Kenta Kikuchi
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
| | - Yoshimi Uchida
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
| | - Hiroki Ikegami
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
| | - Ryo Takagi
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
| | - Satoshi Yotsumoto
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
| | - Takumi Shibuya
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
| | - Chieko Makino-Okamura
- Laboratory for Lymphocyte Differentiation, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa 230-0045, Japan
| | - Hidehiro Fukuyama
- Laboratory for Lymphocyte Differentiation, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa 230-0045, Japan
| | - Takashi Watanabe
- Laboratory for Integrative Genomics, RIKEN Center for Integrative Medical Sciences, Yokohama, Kanagawa 230-0045, Japan
| | - Masaki Ohmuraya
- Department of Genetics, Hyogo College of Medicine, Nishinomiya, Hyogo 663-8501, Japan
| | - Kimi Araki
- Institute of Resource Development and Analysis, Kumamoto University, Kumamoto, Kumamoto, 860-0811, Japan
| | - Gen Nishitai
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan
| | - Masato Tanaka
- Laboratory of Immune Regulation, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo 192-0392, Japan.
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11
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Zondag L, M Clarke R, Wilson MJ. Histone deacetylase activity is required for Botrylloides leachii whole-body regeneration. ACTA ACUST UNITED AC 2019; 222:jeb.203620. [PMID: 31253711 DOI: 10.1242/jeb.203620] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 06/24/2019] [Indexed: 12/13/2022]
Abstract
The colonial tunicate Botrylloides leachii is exceptional at regenerating from a piece of vascular tunic after loss of all adults from the colony. Previous transcriptome analyses indicate a brief period of healing before regeneration of a new adult (zooid) in as little as 8-10 days. However, there is little understanding of how the resulting changes to gene expression, required to drive regeneration, are initiated and how the overall process is regulated. Rapid changes to transcription often occur in response to chromatin changes, mediated by histone modifications such as histone acetylation. Here, we investigated a group of key epigenetic modifiers, histone deacetylases (HDAC), which are known to play an important role in many biological processes such as development, healing and regeneration. Through our transcriptome data, we identified and quantified the expression levels of HDAC and histone acetyltransferase enzymes during whole-body regeneration (WBR). To determine whether HDAC activity is required for WBR, we inhibited its action using valproic acid and trichostatin A. HDAC inhibition prevented the final morphological changes normally associated with WBR and resulted in aberrant gene expression. Botrylloides leachii genes including Slit2, TGF-β, Piwi and Fzd4 all showed altered mRNA levels upon HDAC inhibition in comparison with the control samples. Additionally, atypical expression of Bl_Piwi was found in immunocytes upon HDAC inhibition. Together, these results show that HDAC function, specifically HDAC I/IIa class enzymes, are vital for B. leachii to undergo WBR successfully.
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Affiliation(s)
- Lisa Zondag
- Developmental Biology and Genomics Laboratory, Department of Anatomy, Otago School of Medical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Rebecca M Clarke
- Developmental Biology and Genomics Laboratory, Department of Anatomy, Otago School of Medical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Megan J Wilson
- Developmental Biology and Genomics Laboratory, Department of Anatomy, Otago School of Medical Sciences, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
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12
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Shimada S, Kamiyama T, Yokoo H, Orimo T, Wakayama K, Nagatsu A, Kakisaka T, Kamachi H, Abo D, Sakuhara Y, Taketomi A. Hepatic hypertrophy and hemodynamics of portal venous flow after percutaneous transhepatic portal embolization. BMC Surg 2019; 19:23. [PMID: 30777042 PMCID: PMC6379972 DOI: 10.1186/s12893-019-0486-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 02/12/2019] [Indexed: 02/08/2023] Open
Abstract
Background Percutaneous transhepatic portal embolization (PTPE) is useful for safe major hepatectomy. This study investigated the correlation between hepatic hypertrophy and hemodynamics of portal venous flow by ultrasound sonography after PTPE. Methods We analyzed 58 patients with PTPE, excluding those who underwent recanalization (n = 10). Using CT volumetry results 2 weeks after PTPE, the patients were stratified into a considerable hypertrophy group (CH; n = 15) with an increase rate of remnant liver volume (IR-RLV) ≥ 40% and a minimal hypertrophy group (MH; n = 33) with an IR-RLV < 40%. We investigated the hemodynamics of portal venous flow after PTPE and the favorable factors for hepatic hypertrophy. Results Univariate and multivariate analysis identified the indocyanine green retention rate at 15 min (ICGR15) and increase rate of portal venous flow volume (IR-pFV) at the non-embolized lobe on day 3 after PTPE as independent favorable factors of IR-RLV. Patients with IR-pFV on day 3 after PTPE ≥100% and ICGR15 ≤ 15% (n = 13) exhibited significantly increased IR-RLV compared with others (n = 35). Conclusions Cases with high IR-pFV on day 3 after PTPE exhibited better hepatic hypertrophy. Preserved liver function and increased portal venous flow on day 3 were important.
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Affiliation(s)
- Shingo Shimada
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Toshiya Kamiyama
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan.
| | - Hideki Yokoo
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Tatsuya Orimo
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Kenji Wakayama
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Akihisa Nagatsu
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Tatsuhiko Kakisaka
- Department of Surgery, Sapporo Kousei Hospital, Kita3-Higashi8, Chuo-Ku, Sapporo, Hokkaido, 060-0033, Japan
| | - Hirofumi Kamachi
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Daisuke Abo
- Department of Radiology, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Yusuke Sakuhara
- Department of Radiology, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan
| | - Akinobu Taketomi
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Kita15-Nishi7, Kita-Ku, Sapporo, Hokkaido, 060-8638, Japan
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13
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Tsai T, Tam K, Chen S, Liou J, Tsai Y, Lee Y, Huang T, Shyue S. Deletion of caveolin-1 attenuates LPS/GalN-induced acute liver injury in mice. J Cell Mol Med 2018; 22:5573-5582. [PMID: 30134043 PMCID: PMC6201225 DOI: 10.1111/jcmm.13831] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 06/23/2018] [Accepted: 07/08/2018] [Indexed: 12/15/2022] Open
Abstract
Acute hepatic injury caused by inflammatory liver disease is associated with high mortality. This study examined the role of caveolin-1 (Cav-1) in lipopolysaccharide (LPS) and D-galactosamine (GalN)-induced fulminant hepatic injury in wild type and Cav-1-null (Cav-1-/- ) mice. Hepatic Cav-1 expression was induced post-LPS/GalN treatment in wild-type mice. LPS/GalN-treated Cav-1-/- mice showed reduced lethality and markedly attenuated liver damage, neutrophil infiltration and hepatocyte apoptosis as compared to wild-type mice. Cav-1 deletion significantly reduced LPS/GalN-induced caspase-3, caspase-8 and caspase-9 activation and pro-inflammatory cytokine and chemokine expression. Additionally, Cav-1-/- mice showed suppressed expression of Toll-like receptor 4 (TLR4) and CD14 in Kupffer cells and reduced expression of vascular cell adhesion molecule 1 and intercellular adhesion molecule 1 in liver cells. Cav-1 deletion impeded LPS/GalN-induced inducible nitric oxide synthase expression and nitric oxide production and hindered nuclear factor-κB (NF-κB) activation. Taken together, Cav-1 regulated the expression of mediators that govern LPS-induced inflammatory signalling in mouse liver. Thus, deletion of Cav-1 suppressed the inflammatory response mediated by the LPS-CD14-TLR4-NF-κb pathway and alleviated acute liver injury in mice.
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Affiliation(s)
| | - Kabik Tam
- Institute of Biomedical SciencesAcademia SinicaTaipeiTaiwan
| | - Shu‐Fen Chen
- Institute of Biomedical SciencesAcademia SinicaTaipeiTaiwan
| | - Jun‐Yang Liou
- Institute of Cellular and System MedicineNational Health Research InstitutesZhunanTaiwan
| | - Yi‐Chen Tsai
- Institute of Biomedical SciencesAcademia SinicaTaipeiTaiwan
| | - Yen‐Ming Lee
- Institute of Biomedical SciencesAcademia SinicaTaipeiTaiwan
- Graduate Institute of Life ScienceNational Defense Medical CenterTaipeiTaiwan
| | - Tai‐Yu Huang
- Institute of Biomedical SciencesAcademia SinicaTaipeiTaiwan
| | - Song‐Kun Shyue
- Institute of Biomedical SciencesAcademia SinicaTaipeiTaiwan
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14
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Panic A, Stanimirovic J, Obradovic M, Sudar-Milovanovic E, Perovic M, Lackovic M, Petrovic N, Isenovic ER. Estradiol-mediated regulation of hepatic iNOS in obese rats: Impact of Src, ERK1/2, AMPKα, and miR-221. Biotechnol Appl Biochem 2018; 65:797-806. [PMID: 29957877 DOI: 10.1002/bab.1680] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 06/07/2018] [Accepted: 06/26/2018] [Indexed: 01/19/2023]
Abstract
PURPOSE This study aimed to investigate in vivo effects of estradiol on the regulation of hepatic inducible nitric oxide synthase (iNOS) expression in the high fat (HF) diet-induced obesity. Also, we aimed to investigate whether activation of the extracellular signal-regulated kinase (ERK1/2), adenosine monophosphate-activated protein kinase (AMPK), Src kinase, and miR-221 is involved in estradiol-mediated regulation of iNOS in the liver of obese male Wistar rats. Male Wistar rats were fed a standard laboratory diet or a HF diet for 10 weeks. Half of HF rats were treated with estradiol intraperitoneally (40 μg/kg), whereas the other half were placebo-treated 24 H before euthanasia. Results show that estradiol treatment of HF rats decreased hepatic iNOS mRNA (P < 0.05) and protein expression (P < 0.01), the protein levels of p65 subunit of nuclear factor κB (P < 0.05) and ERα (P < 0.05), ERK1/2 phosphorylation (P < 0.001), and ERα/Src kinase association (P < 0.05). By contrast, hepatic Src protein level (P < 0.05), AMPKα phosphorylation (P < 0.05), and miR-221 expression (P < 0.05) were increased in HF rats after estradiol treatment. Our results indicate that estradiol in vivo regulates hepatic iNOS expression in obese rats via molecular mechanisms involving ERK1/2, AMPK, Src, and miR-221 signaling.
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Affiliation(s)
- Anastasija Panic
- Laboratory of Radiobiology and Molecular Genetics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Julijana Stanimirovic
- Laboratory of Radiobiology and Molecular Genetics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Milan Obradovic
- Laboratory of Radiobiology and Molecular Genetics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Emina Sudar-Milovanovic
- Laboratory of Radiobiology and Molecular Genetics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
| | - Milan Perovic
- Clinic for Gineacology and Obstetrics "Narodni front,", Belgrade, Serbia
| | - Milena Lackovic
- Clinical Hospital Centre Zemun, Clinic for Internal Medicine, University of Belgrade, Belgrade, Serbia
| | - Nina Petrovic
- Laboratory of Radiobiology and Molecular Genetics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia.,Institute for Oncology and Radiology of Serbia, Belgrade, Serbia
| | - Esma R Isenovic
- Laboratory of Radiobiology and Molecular Genetics, Vinca Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia
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15
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Hypoxic Signaling and Cholesterol Lipotoxicity in Fatty Liver Disease Progression. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2018; 2018:2548154. [PMID: 29955245 PMCID: PMC6000860 DOI: 10.1155/2018/2548154] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 04/30/2018] [Accepted: 05/14/2018] [Indexed: 02/06/2023]
Abstract
Cholesterol is the only lipid whose absorption in the gastrointestinal tract is limited by gate-keeping transporters and efflux mechanisms, preventing its rapid absorption and accumulation in the liver and blood vessels. In this review, I explored the current data regarding cholesterol accumulation in liver cells and key mechanisms in cholesterol-induced fatty liver disease associated with the activation of deleterious hypoxic and nitric oxide signal transduction pathways. Although nonalcoholic fatty liver disease (NAFLD) affects both obese and nonobese individuals, the mechanism of NAFLD progression in lean individuals with healthy metabolism is puzzling. Lean NAFLD individuals exhibit normal metabolic responses, implying that liver damage is not associated with impaired metabolism per se and that direct lipotoxic effects are crucial for disease progression. Several redox and oxidant signaling pathways involving cholesterol are at play in fatty liver disease development. These include impairment of the mitochondrial and lysosomal function by cholesterol loading of the inner-cell membranes; formation of cholesterol crystals and hepatocyte degradation; and crown-like structures surrounding degrading hepatocytes, activating Kupffer cells, and evoking inflammation. The current review focuses on the induction of liver inflammation, fibrosis, and steatosis by free cholesterol via the hypoxia-inducible factor 1α (HIF-1α), a main oxygen-sensing transcription factor involved in all stages of NAFLD. Cholesterol loading in hepatocytes can result in chronic HIF-1α activity because of the decreased oxygen availability and excessive production of nitric oxide and mitochondrial reactive oxygen species.
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16
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Yagmurdur H, Binnetoglu K, Astarci HM, Yagmurdur MC. Propofol attenuates cytokine-mediated upregulation of expression of inducible nitric oxide synthase and apoptosis during regeneration post-partial hepatectomy. Acta Cir Bras 2017; 32:396-406. [PMID: 28591369 DOI: 10.1590/s0102-865020170050000009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Accepted: 04/19/2017] [Indexed: 01/28/2023] Open
Abstract
Purpose: To determine the effects of propofol and ketamine anesthesia on liver regeneration in rats after partial hepatectomy (PHT). Methods: Male Wistar albino rats were assigned randomly to four groups of 10. Anesthesia was induced and maintained with propofol in groups 1 and 2, and with ketamine in groups 3 and 4. PHT was undertaken in groups 1 and 3. Rats in groups 2 and 4 (control groups) underwent an identical surgical procedure, but without PHT. At postoperative day-5, rats were killed. Regenerated liver was removed, weighed, and evaluated (by immunohistochemical means) for expression of inducible nitric oxide synthase (iNOS), endothelial NOS (eNOS), apoptosis protease-activating factor (APAF)-1, and proliferating cell nuclear antigen (PCNA). Also, blood samples were collected for measurement of levels of tumor necrosis factor (TNF)-α and interleukin (IL)-6. Results: Between groups 2 and 4, there were no differences in tissue levels of iNOS, eNOS, and APAF-1 or plasma levels of TNF-α and IL-6. eNOS expression was similar in group 1 and group 3. Expression of iNOS and APAF-1 was mild-to-moderate in group 1, but significantly higher in group 3. Groups 1 and 3 showed an increase in PCNA expression, but expression in both groups was comparable. Plasma levels of TNF-α and IL-6 increased to a lesser degree in group 1 than in group 3. Conclusion: Propofol, as an anesthetic agent, may attenuate cytokine-mediated upregulation of iNOS expression and apoptosis in an animal model of liver regeneration after partial hepatectomy.
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Affiliation(s)
- Hatice Yagmurdur
- Professor, Department of Anesthesiology and Reanimation, School of Medicine, Kafkas University, Kars, Turkey. Conception and design of the study; acquisition, analysis and interpretation of data; manuscript writing; critical revision
| | - Kenan Binnetoglu
- Assistant Professor, Department of General Surgery, School of Medicine, Kafkas University, Kars, Turkey. Design of the study, manuscript writing
| | - Hesna Muzeyyen Astarci
- MD, Department of Pathology, Ministry of Health Ankara Research and Training Hospital, Ankara, Turkey. Acquisition, analysis and interpretation of data; manuscript writing
| | - Mahmut Can Yagmurdur
- Professor, Department of General Surgery, School of Medicine, Kafkas University, Kars, Turkey. Conception of the study, analysis and interpretation of data, manuscript writing, critical revision
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17
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Yu Y, Tamai M, Tagawa YI. Nitric oxide is critical for avoiding hepatic lipid overloading via IL-6 induction during liver regeneration after partial hepatectomy in mice. Exp Anim 2017; 66:293-302. [PMID: 28515388 PMCID: PMC5682341 DOI: 10.1538/expanim.17-0017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Nitric oxide (NO), generated from L-arginine by three different isoforms of nitric oxide synthase (NOS), is a pleiotropic factor to regulate physiological functions in almost every organ and tissue. Each knockout mouse of iNOS or eNOS has been used to suggest that NO has a crucial role in liver regeneration after partial hepatectomy (PH), for NO may inhibit caspase 3 activity and is required for EGFR signaling. In previous reports, defective mitochondrial β-oxidation was observed in eNOS KO mice, and hepatic steatosis was often correlated to deficient liver regeneration, so we focused on metabolic perspective and hypothesized that NO depletion in PH mice would affect hepatocytic lipolysis and impair hepatocytes proliferation. We inhibited all NOS isoforms by administrating L-NG-nitroarginine methyl ester (L-NAME) to PH mice, and hepatocyte DNA synthesis was severely inhibited at 40-44 h post PH in L-NAME (+) group. IL-6 was robustly secreted into circulating blood in L-NAME (-) group, but not in L-NAME (+) group. Down-regulation of carnitine palmytoyltransferase 1A, massive lipid accumulation and elevated endoplasmic reticulum (ER) stress relative genes expression level were observed in L-NAME (+) group mouse liver. The expression level of C/EBP homologous protein, a mediator of ER stress induced apoptosis, significantly increased in L-NAME (+) group. Our findings suggest the lack of NO affected IL-6 induction and hepatocyte lipolysis after PH, consequently leading to excessive hepatic lipid accumulation, elevated ER stress and impaired hepatocyte proliferation.
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Affiliation(s)
- Yue Yu
- Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 B51, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan
| | - Miho Tamai
- Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 B51, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan.,School of Life Science and Technology, Tokyo Institute of Technology, 4259 B51, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan.,Course of Oral Medical Science, Graduate School of Dental Medicine, Hokkaido University, Kita 13-jo, Nishi 7-chome, Kita-ku, Sapporo, Hokkaido 060-8586, Japan
| | - Yoh-Ichi Tagawa
- Department of Biomolecular Engineering, Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology, 4259 B51, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan.,School of Life Science and Technology, Tokyo Institute of Technology, 4259 B51, Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan
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18
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Li D, Li J, Wang G, Qin Y, Niu Z, Li Z, Xu C. Delayed Liver Regeneration after Partial Hepatectomy in Aged Nos2 Knockout Mice. CELL JOURNAL 2017; 19:218-230. [PMID: 28670514 PMCID: PMC5412780 DOI: 10.22074/cellj.2016.4878] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Accepted: 07/25/2016] [Indexed: 01/13/2023]
Abstract
Objective Patients over 60 years of age have higher mortality and morbidity after major
liver resections. Nitric oxide (NO) derived from the catalytic activity of Nos2 plays a beneficial role in liver regeneration (LR) after partial hepatectomy (PH). In this experiment, we
evaluated the effect of Nos2 knockout (KO) on LR in aged mice after PH.
Materials and Methods In this experimental study, 52 two-year-old Nos2 KO and 46 the
same age wild-type (WT) C57BL/6J mice were subjected to 2/3 PH. Liver tissues were
collected at 11 time points after PH. Mice survival ratio and liver coefficient (liver-weight/
body-weight) was calculated. Transcript and protein levels were estimated by reverse
transcriptase-quantitative polymerase chain reaction (RT-qPCR) and Western blot, respectively.
Results The aged Nos2 KO mice had lower survival ratio (P=0.039) and liver coefficient
(P=0.002) at the termination phase. Nos2 transcript level was obviously increased after
PH in WT mice and undetected in the Nos2 KO mice. During LR, the expression at the
transcript level of Cyclin D1, Cyclin A2 and Cyclin B1 and protein expression level of
proliferation marker Ki67 and proliferation-associated transcription factors JNK1, NF-kB
and STAT3 were decreased or delayed. The expression of pro-apoptotic proteins, CASPASE3, CASPASE9 and BAX, was increased in the Nos2 KO mice.
Conclusion Decreased survival ratio and impaired LR in aged Nos2 KO mice is probably
due to decreased liver cell proliferation and increased liver cell apoptosis.
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Affiliation(s)
- Deming Li
- Key Laboratory for Cell Differentiation Regulation, Xinxiang, China.,College of Life Science, Henan Normal University, Xinxiang, China
| | - Jun Li
- Key Laboratory for Cell Differentiation Regulation, Xinxiang, China.,College of Life Science, Henan Normal University, Xinxiang, China
| | - Gaiping Wang
- Key Laboratory for Cell Differentiation Regulation, Xinxiang, China.,College of Life Science, Henan Normal University, Xinxiang, China
| | - Yanli Qin
- Key Laboratory for Cell Differentiation Regulation, Xinxiang, China.,College of Life Science, Henan Normal University, Xinxiang, China
| | - Zhipeng Niu
- Key Laboratory for Cell Differentiation Regulation, Xinxiang, China.,College of Life Science, Henan Normal University, Xinxiang, China
| | - Ziwei Li
- Key Laboratory for Cell Differentiation Regulation, Xinxiang, China.,College of Life Science, Henan Normal University, Xinxiang, China
| | - Cunshuan Xu
- Key Laboratory for Cell Differentiation Regulation, Xinxiang, China.,College of Life Science, Henan Normal University, Xinxiang, China
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19
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Ramaiah S, Rivera C, Arteel G. Early-Phase Alcoholic Liver Disease: An Update on Animal Models, Pathology, and Pathogenesis. Int J Toxicol 2016; 23:217-31. [PMID: 15371166 DOI: 10.1080/10915810490502069] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Alcoholic liver disease (ALD) remains to be one of the most common etiology of liver disease and is a major cause of morbidity and mortality worldwide. The pathologic stages of ALD comprises of steatosis, steatohepatitis, and fibrosis/cirrhosis. Steatosis and steatohepatitis represents the early phase of ALD and are precursor stages for fibrosis/cirrhosis. Numerous research efforts have been directed at recognizing cofactors interacting with alcohol in the pathogenesis of steatosis and steatohepatitis. This review will elucidate the constellation of complex pathogenesis, available animal models, and microscopic pathologic findings mostly in the early-phase of ALD. The role of endotoxin, reactive oxygen species, alcohol metabolism, and cytokines are discussed. Understanding the mechanisms of early-phase ALD should provide insight into the development of therapeutic strategies and thereby decrease the morbidity and mortality associated with ALD.
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Affiliation(s)
- Shashi Ramaiah
- Department of Pathobiology, Texas Veterinary Medical Center, College of Veterinary Medicine, Texas A and M University, College Station, TX 77843, USA
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20
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Chyu KY, Dimayuga PC, Zhao X, Nilsson J, Shah PK, Cercek B. Altered AP-1/Ref-1 redox pathway and reduced proliferative response in iNOS-deficient vascular smooth muscle cells. Vasc Med 2016; 9:177-83. [PMID: 15675181 DOI: 10.1191/1358863x04vm545oa] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We previously reported that injury-induced medial vascular smooth muscle cell (VSMC) proliferation and neointima formation in carotid arteries of inducible nitric oxide synthase knockout (iNOS KO) mice were significantly reduced compared with wild type (WT). However, the molecular pathway underlying such differences is not known. In this in vitro study, we discovered that the AP-1/Ref-1/thioredoxin signaling pathway is altered in aortic VSMC from iNOS KO mice, which leads to reduced growth response when compared with aortic VSMC from WT mice. After equal initial seeding, the cell number after 7 days in serum medium was less in iNOS KO cells compared with WT VSMC (1.2-0.6-105 vs 3.2-1.1-105; p < 0.05). Significantly more iNOS KO cells remained in the G0/G1 phase compared with WT cells after 24-h serum treatment (82.6-13.7% vs 62.3-14.6%; p < 0.05) by cell-cycle analysis. Nuclear PCNA expression was also less in the iNOS KO cells, which was not affected by exogenous NO or superoxide. Superoxide generation after 24-h serum stimulation was less in the iNOS KO cells compared with WT cells. After 30-min serum stimulation, AP-1 DNA binding was reduced and a lack of increase in nuclear c-Jun protein was observed in iNOS KO VSMC. RT-PCR analysis confirmed a lack of inducible c-Jun mRNA after serum stimulation in the KO cells. In addition, KO cells had less nuclear reducing factor-1 (Ref-1) and serum-inducible thioredoxin protein expression. Reduced proliferative response of iNOS KO VSMC to serum treatment is associated with altered AP-1/Ref-1/thioredoxin pathway activation.
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Affiliation(s)
- Kuang-Yuh Chyu
- Atherosclerosis Research Center, Burns and Allen Research Institute, Division of Cardiology, Cedars-Siffai Medical Center/David Geffen School of Medicine, UCLA, Los Angeles, CA 90048, USA.
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21
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Elchaninov AV, Fatkhudinov TK, Usman NY, Arutyunyan IV, Makarov AV, Kananykhina EY, Glinkina VV, Bolshakova GB, Sukhikh GT. Expression of Cytokine Genes and Growth Factors in Rat Lungs and Kidneys after Subtotal Hepatectomy. Bull Exp Biol Med 2016; 161:395-9. [PMID: 27496032 DOI: 10.1007/s10517-016-3423-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Indexed: 02/07/2023]
Abstract
Expression of il1b, il6, il10, tnfa, hgf, tgfb, vegf, and fgf2 genes in the lungs and kidneys was examined on rat model of liver regeneration after subtotal hepatectomy. Enhanced expression of il6, il10, tnfa, hgf, and fgf2 genes was detected at the early terms after 80% liver resection.
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Affiliation(s)
- A V Elchaninov
- V. I. Kulakov Research Center for Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation, Moscow, Russia
| | - T Kh Fatkhudinov
- V. I. Kulakov Research Center for Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation, Moscow, Russia.
| | - N Yu Usman
- V. I. Kulakov Research Center for Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation, Moscow, Russia
| | - I V Arutyunyan
- V. I. Kulakov Research Center for Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation, Moscow, Russia
| | - A V Makarov
- V. I. Kulakov Research Center for Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation, Moscow, Russia
| | - E Yu Kananykhina
- V. I. Kulakov Research Center for Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation, Moscow, Russia
- State Research Institute of Human Morphology, Moscow, Russia
| | - V V Glinkina
- N. I. Pirogov National Research Medical University, Moscow, Russia
| | - G B Bolshakova
- State Research Institute of Human Morphology, Moscow, Russia
| | - G T Sukhikh
- V. I. Kulakov Research Center for Obstetrics, Gynecology, and Perinatology, Ministry of Health of the Russian Federation, Moscow, Russia
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22
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Kishikawa T, Otsuka M, Tan PS, Ohno M, Sun X, Yoshikawa T, Shibata C, Takata A, Kojima K, Takehana K, Ohishi M, Ota S, Noyama T, Kondo Y, Sato M, Soga T, Hoshida Y, Koike K. Decreased miR122 in hepatocellular carcinoma leads to chemoresistance with increased arginine. Oncotarget 2016; 6:8339-52. [PMID: 25826076 PMCID: PMC4480756 DOI: 10.18632/oncotarget.3234] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 01/28/2015] [Indexed: 12/12/2022] Open
Abstract
Reduced expression of microRNA122 (miR122), a liver-specific microRNA, is
frequent in hepatocellular carcinoma (HCC). However, its biological
significances remain poorly understood. Because deregulated amino acid levels in
cancers can affect their biological behavior, we determined the amino acid
levels in miR122-silenced mouse liver tissues, in which intracellular arginine
levels were significantly increased. The increased intracellular arginine levels
were through upregulation of the solute carrier family 7 (SLC7A1), a transporter
of arginine and a direct target of miR122. Arginine is the substrate for nitric
oxide (NO) synthetase, and intracellular NO levels were increased in
miR122-silenced HCC cells, with increased resistance to sorafenib, a multikinase
inhibitor. Conversely, maintenance of the miR122-silenced HCC cells in
arginine-depleted culture media, as well as overexpression of miR122 in
miR122-low-expressing HCC cells, reversed these effects and rendered the cells
more sensitive to sorafenib. Using a reporter knock-in construct, chemical
compounds were screened, and Wee1 kinase inhibitor was identified as
upregulators of miR122 transcription, which increased the sensitivity of the
cells to sorafenib. These results provide an insight into sorafenib resistance
in miR122-low HCC, and suggest that arginine depletion or a combination of
sorafenib with the identified compound may provide promising approaches to
managing this HCC subset.
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Affiliation(s)
- Takahiro Kishikawa
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Motoyuki Otsuka
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan.,Japan Science and Technology Agency, PRESTO, Kawaguchi, Saitama 332-0012, Japan
| | - Poh Seng Tan
- Liver Cancer Program, Tisch Cancer Institute, Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, NY 10029, USA.,Division of Gastroenterology and Hepatology, University Medicine Cluster, National University Health System, 119228, Singapore
| | - Motoko Ohno
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Xiaochen Sun
- Liver Cancer Program, Tisch Cancer Institute, Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, NY 10029, USA
| | - Takeshi Yoshikawa
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Chikako Shibata
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Akemi Takata
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Kentaro Kojima
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Kenji Takehana
- Pharmacology Research Laboratory, Research Institute, Ajinomoto Pharmaceutical Co., Ltd., Kawasaki, Kanagawa 210-8681, Japan
| | - Maki Ohishi
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata 997-0052, Japan
| | - Sana Ota
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata 997-0052, Japan
| | - Tomoyuki Noyama
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Yuji Kondo
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Masaya Sato
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Tomoyoshi Soga
- Pharmacology Research Laboratory, Research Institute, Ajinomoto Pharmaceutical Co., Ltd., Kawasaki, Kanagawa 210-8681, Japan
| | - Yujin Hoshida
- Liver Cancer Program, Tisch Cancer Institute, Division of Liver Diseases, Department of Medicine, Icahn School of Medicine at Mount Sinai, NY 10029, USA
| | - Kazuhiko Koike
- Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan
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23
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Robinson MW, Harmon C, O'Farrelly C. Liver immunology and its role in inflammation and homeostasis. Cell Mol Immunol 2016; 13:267-76. [PMID: 27063467 PMCID: PMC4856809 DOI: 10.1038/cmi.2016.3] [Citation(s) in RCA: 621] [Impact Index Per Article: 77.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 01/08/2016] [Accepted: 01/09/2016] [Indexed: 12/12/2022] Open
Abstract
The human liver is usually perceived as a non-immunological organ engaged primarily in metabolic, nutrient storage and detoxification activities. However, we now know that the healthy liver is also a site of complex immunological activity mediated by a diverse immune cell repertoire as well as non-hematopoietic cell populations. In the non-diseased liver, metabolic and tissue remodeling functions require elements of inflammation. This inflammation, in combination with regular exposure to dietary and microbial products, creates the potential for excessive immune activation. In this complex microenvironment, the hepatic immune system tolerates harmless molecules while at the same time remaining alert to possible infectious agents, malignant cells or tissue damage. Upon appropriate immune activation to challenge by pathogens or tissue damage, mechanisms to resolve inflammation are essential to maintain liver homeostasis. Failure to clear 'dangerous' stimuli or regulate appropriately activated immune mechanisms leads to pathological inflammation and disrupted tissue homeostasis characterized by the progressive development of fibrosis, cirrhosis and eventual liver failure. Hepatic inflammatory mechanisms therefore have a spectrum of roles in the healthy adult liver; they are essential to maintain tissue and organ homeostasis and, when dysregulated, are key drivers of the liver pathology associated with chronic infection, autoimmunity and malignancy. In this review, we explore the changing perception of inflammation and inflammatory mediators in normal liver homeostasis and propose targeting of liver-specific immune regulation pathways as a therapeutic approach to treat liver disease.
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Affiliation(s)
- Mark W Robinson
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin D2, Ireland
| | - Cathal Harmon
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin D2, Ireland
| | - Cliona O'Farrelly
- School of Biochemistry and Immunology, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin D2, Ireland
- School of Medicine, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin D2, Ireland
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24
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Effect of nebivolol on liver regeneration in an experimental 70% partial hepatectomy model. Asian J Surg 2016; 40:375-379. [PMID: 26920216 DOI: 10.1016/j.asjsur.2015.12.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 12/22/2015] [Accepted: 12/30/2015] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Factors affecting liver regeneration are still relevant. The purpose of this study is to investigate the effect of nebivolol treatment on liver regeneration in rats in which 70% partial hepatectomy was performed. METHODS Three groups were created: the control group, the low dose group, and the high dose group, with 20 rats in each group and 70% hepatectomy was performed in all rats. Immediately after partial liver resection, 2 mL physiological saline solution was administered to the control group via oral gavage, 0.5 mg/kg nebivolol was administered via oral gavage to the low dose group and 2 mg/kg nebivolol was administered via oral gavage to the high dose group. On the 1st and 5th days after liver resection, 10 subjects were sacrificed from each group, and liver weights and the mitotic count and Ki-67 were measured. RESULTS Regenerating liver weight on the 1st and 5th days after partial hepatectomy was statistically different in the low dose and high dose nebivolol groups compared to the control group. Mitotic count on the 1st day after partial hepatectomy was significantly higher in the low dose and high dose nebivolol groups than the control group. There was no statistically significant difference detected between the three groups for the 5th day. On the 1st day, Ki-67 rates were significantly higher in both groups given nebivolol than the control group. However, 5th day results were not statistically significant. CONCLUSION Nebivolol increases regeneration after partial hepatectomy in rats.
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25
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Yigit F, Gurel-Gurevin E, Isbilen-Basok B, Esener OBB, Bilal T, Keser O, Altiner A, Yilmazer N, Ikitimur-Armutak EI. Protective effect of Spirulina platensis against cell damage and apoptosis in hepatic tissue caused by high fat diet. Biotech Histochem 2016; 91:182-94. [PMID: 26820259 DOI: 10.3109/10520295.2015.1114142] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Spirulina platensis is a microalga that may be a source of antioxidants that can reduce body fat deposition. Consumption of a high fat diet produces elevated blood lipid levels, inflammation and apoptosis. We investigated the possible effects of S. platensis on the blood lipid profile, and liver inflammation and apoptosis in rats fed a high fat diet. Sixty-four young male rats were divided into eight equal groups. The control group was fed a basic diet. The experimental groups were fed a diet for 60 days that was prepared by mixing variable amounts of 43% vegetable oil and 10% cholesterol with or without 3% S. platensis mixed with the basal diet. Blood and liver tissue samples were collected from each animal. Serum samples were used to analyze lipid parameters, total antioxidant status and total oxidant status. iNOS and eNOS were determined by immunohistochemistry. TUNEL staining was used to detect apoptosis to investigate a possible connection between inflammation and apoptosis in the liver tissue. The relations between fat deposition and liver degeneration were assessed by Sirius red staining and alpha-smooth muscle actin immunostaining. S. platensis reduced serum HDL-C, LDL-C and triglyceride, increased HDL-C levels in rats fed a high fat diet to near control levels, and reduced iNOS levels and increased eNOS levels in the liver tissue compared to vegetable oil and cholesterol treated groups. The apoptotic index was reduced in the groups that were fed a high fat or a basic diet when supplemented with S. platensis.
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Affiliation(s)
- F Yigit
- a Istanbul University, Faculty of Veterinary Medicine, Department of Histology and Embryology , Avcilar, Istanbul , Turkey
| | - E Gurel-Gurevin
- b Istanbul University, Faculty of Science, Department of Biology , Vezneciler, Istanbul , Turkey
| | - B Isbilen-Basok
- c Istanbul Medeniyet University, Faculty of Medicine, Department of Medicinal Biochemistry , Goztepe, Istanbul , Turkey
| | - O B B Esener
- a Istanbul University, Faculty of Veterinary Medicine, Department of Histology and Embryology , Avcilar, Istanbul , Turkey
| | - T Bilal
- d Istanbul University, Faculty of Veterinary Medicine, Department of Animal Nutrition of Nutritional Disease , Avcilar, Istanbul , Turkey
| | - O Keser
- d Istanbul University, Faculty of Veterinary Medicine, Department of Animal Nutrition of Nutritional Disease , Avcilar, Istanbul , Turkey
| | - A Altiner
- e Istanbul University, Faculty of Veterinary Medicine, Department of Biochemistry , Avcilar, Istanbul , Turkey
| | - N Yilmazer
- f Namık Kemal University, Faculty of Arts and Sciences, Department of Biology , Tekirdag , Turkey
| | - E I Ikitimur-Armutak
- a Istanbul University, Faculty of Veterinary Medicine, Department of Histology and Embryology , Avcilar, Istanbul , Turkey
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26
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Elchaninov A, Fatkhudinov T, Usman N, Kananykhina E, Arutyunyan I, Makarov A, Bolshakova G, Goldshtein D, Sukhikh G. Molecular Survey of Cell Source Usage during Subtotal Hepatectomy-Induced Liver Regeneration in Rats. PLoS One 2016; 11:e0162613. [PMID: 27631110 PMCID: PMC5025203 DOI: 10.1371/journal.pone.0162613] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 08/11/2016] [Indexed: 02/07/2023] Open
Abstract
Proliferation of hepatocytes is known to be the main process in the hepatectomy-induced liver regrowth; however, in cases of extensive loss it may be insufficient for complete recovery unless supported by some additional sources e.g. mobilization of undifferentiated progenitors. The study was conducted on rat model of 80% subtotal hepatectomy; the objective was to evaluate contributions of hepatocytes and resident progenitor cells to the hepatic tissue recovery via monitoring specific mRNA and/or protein expression levels for a panel of genes implicated in growth, cell differentiation, angiogenesis, and inflammation. Some of the genes showed distinctive temporal expression patterns, which were loosely associated with two waves of hepatocyte proliferation observed at 2 and 7 days after the surgery. Focusing on genes implicated in regulation of the progenitor cell activity, we came across slight increases in expression levels for Sox9 and two genes encoding tumor necrosis factor-like cytokine TWEAK (Tnfsf12) and its receptor Fn14 (Tnfrsf12a). At the same time, no increase in numbers of cytokeratin 19-positive (CK19+) cells was observed in periportal areas, and no CK19+ cells were found in hepatic plates. Since CK19 is thought to be a specific marker of both cholangiocytes and the hepatic progenitor cells, the data indicate a lack of activation of the resident progenitor cells during recovery of hepatic tissue after 80% subtotal hepatectomy. Thus, proliferation of hepatocytes invariably makes the major contribution to the hepatic tissue recovery, although in the cases of subtotal loss this contribution is distinctively modulated. In particular, induction of Sox9 and TWEAK/Fn14 regulatory pathways, conventionally attributed to progenitor cell activation, may incidentally stimulate mitotic activity of hepatocytes.
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Affiliation(s)
- Andrey Elchaninov
- Research Center for Obstetrics, Gynecology and Perinatology of Ministry of Healthcare of the Russian Federation, 4 Oparina Street, Moscow 117997, Russia
- Scientific Research Institute of Human Morphology, 3 Tsurupa Street, Moscow 117418, Russia
- Pirogov Russian National Research Medical University, Ministry of Healthcare of the Russian Federation, 1 Ostrovitianov Street, Moscow 117997, Russia
| | - Timur Fatkhudinov
- Research Center for Obstetrics, Gynecology and Perinatology of Ministry of Healthcare of the Russian Federation, 4 Oparina Street, Moscow 117997, Russia
- Scientific Research Institute of Human Morphology, 3 Tsurupa Street, Moscow 117418, Russia
- * E-mail:
| | - Natalia Usman
- Research Center for Obstetrics, Gynecology and Perinatology of Ministry of Healthcare of the Russian Federation, 4 Oparina Street, Moscow 117997, Russia
- Scientific Research Institute of Human Morphology, 3 Tsurupa Street, Moscow 117418, Russia
- Pirogov Russian National Research Medical University, Ministry of Healthcare of the Russian Federation, 1 Ostrovitianov Street, Moscow 117997, Russia
| | - Evgeniya Kananykhina
- Research Center for Obstetrics, Gynecology and Perinatology of Ministry of Healthcare of the Russian Federation, 4 Oparina Street, Moscow 117997, Russia
- Scientific Research Institute of Human Morphology, 3 Tsurupa Street, Moscow 117418, Russia
| | - Irina Arutyunyan
- Research Center for Obstetrics, Gynecology and Perinatology of Ministry of Healthcare of the Russian Federation, 4 Oparina Street, Moscow 117997, Russia
- Scientific Research Institute of Human Morphology, 3 Tsurupa Street, Moscow 117418, Russia
| | - Andrey Makarov
- Research Center for Obstetrics, Gynecology and Perinatology of Ministry of Healthcare of the Russian Federation, 4 Oparina Street, Moscow 117997, Russia
- Scientific Research Institute of Human Morphology, 3 Tsurupa Street, Moscow 117418, Russia
- Pirogov Russian National Research Medical University, Ministry of Healthcare of the Russian Federation, 1 Ostrovitianov Street, Moscow 117997, Russia
| | - Galina Bolshakova
- Scientific Research Institute of Human Morphology, 3 Tsurupa Street, Moscow 117418, Russia
| | - Dmitry Goldshtein
- Research Centre of Medical Genetics, 1 Moskvorechie Street, Moscow 115478, Russia
| | - Gennady Sukhikh
- Research Center for Obstetrics, Gynecology and Perinatology of Ministry of Healthcare of the Russian Federation, 4 Oparina Street, Moscow 117997, Russia
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27
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Constitutive Activation of the Nlrc4 Inflammasome Prevents Hepatic Fibrosis and Promotes Hepatic Regeneration after Partial Hepatectomy. Mediators Inflamm 2015; 2015:909827. [PMID: 26635450 PMCID: PMC4655266 DOI: 10.1155/2015/909827] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 09/30/2015] [Accepted: 10/05/2015] [Indexed: 01/01/2023] Open
Abstract
TThe molecular mechanisms responsible for the development of hepatic fibrosis are not fully understood. The Nlrc4 inflammasome detects cytosolic presence of bacterial components, activating inflammatory cytokines to facilitate clearance of pathogens and infected cells. We hypothesized that low-grade constitutive activation of the Nlrc4 inflammasome may lead to induced hepatocyte proliferation and prevent the development of hepatic fibrosis. The gene of Nlrc4 contains two single nucleotide polymorphisms (SNPs), one located within the Nlrc4 promoter and one contained within exon 5. These SNPs regulate Nlrc4 gene transcription and activation as measured through gene reporter assays and IL-1β secretion. The 17C-6 mice have increased IL-1β in plasma after chronic carbon tetrachloride (CCl4) administration compared to B6 mice. After two-thirds partial hepatectomy (2/3PH) 17C-6 mice have earlier restoration of liver mass with greater cyclin D1 protein and BrdU incorporation compared to B6 mice at several time points. These data reveal mild constitutive activation of the Nlrc4 inflammasome as the results of two SNPs, which leads to the stimulation of hepatocyte proliferation. The increased liver regeneration induces rapid liver mass recovery after hepatectomy and may prevent the development of hepatotoxin-induced liver fibrosis.
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28
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Barta A, Janega P, Babál P, Murár E, Cebová M, Pechánová O. The effect of curcumin on liver fibrosis in the rat model of microsurgical cholestasis. Food Funct 2015; 6:2187-93. [DOI: 10.1039/c5fo00176e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We aimed to determine the effects of curcumin on liver fibrosis and to clarify the role of nuclear factor-κB (NF-κB) and inducible nitric oxide synthase (iNOS) in a model of microsurgical cholestasis in the early stage of extrahepatic biliary atresia.
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Affiliation(s)
- Andrej Barta
- Institute of Normal and Pathological Physiology and Centre of excellence for regulatory role of nitric oxide in civilization diseases
- Slovak Academy of Sciences
- Bratislava
- Slovak Republic
| | - Pavol Janega
- Institute of Normal and Pathological Physiology and Centre of excellence for regulatory role of nitric oxide in civilization diseases
- Slovak Academy of Sciences
- Bratislava
- Slovak Republic
- Department of Pathological Anatomy
| | - Pavel Babál
- Department of Pathological Anatomy
- Faculty of Medicine
- Comenius University
- Bratislava
- Slovak Republic
| | - Erich Murár
- Pediatric Surgery Department
- Children's University Hospital
- Slovak Medical University
- Banská Bystrica
- Slovak Republic
| | - Martina Cebová
- Institute of Normal and Pathological Physiology and Centre of excellence for regulatory role of nitric oxide in civilization diseases
- Slovak Academy of Sciences
- Bratislava
- Slovak Republic
| | - Olga Pechánová
- Institute of Normal and Pathological Physiology and Centre of excellence for regulatory role of nitric oxide in civilization diseases
- Slovak Academy of Sciences
- Bratislava
- Slovak Republic
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29
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Kabil NN, Seddiek HA, Yassin NA, Gamal-Eldin MM. Effect of ghrelin on chronic liver injury and fibrogenesis in male rats: possible role of nitric oxide. Peptides 2014; 52:90-7. [PMID: 24333973 DOI: 10.1016/j.peptides.2013.11.022] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 11/25/2013] [Accepted: 11/26/2013] [Indexed: 12/11/2022]
Abstract
Recent studies have revealed that ghrelin may be an antioxidant and anti-inflammatory agent in many organs, however its role in chronic liver injury (CLI) remains unclear. The role of nitric oxide (NO) in CLI is controversial as evidence suggests that NO is either a primary mediator of liver cell injury or exhibits a protective effect against injurious stimuli. Recent evidence demonstrated that the therapeutic potential for ghrelin was through eNOS activation and increase in NO production. However, its role on NO production in the liver has not been previously investigated. The aim of this study was to investigate the role of ghrelin in treatment of CLI, and whether this action is mediated through NO. Forty male rats were divided into four groups: Group I: Control; Group II: chronic liver injury (CLI); Group III: CLI+Ghrelin; and Group IV: CLI+Ghrelin+l-NAME. Liver enzymes and tumor necrosis factor alpha (TNF-α), were measured to assess hepatocellular injury. Liver tissue collagen content, malondialdehyde (MDA), gene expression of Bax, Bcl-2, and eNOS were assessed to determine the mechanism of ghrelin action. Results showed that ghrelin decreased serum liver enzymes and TNF-α levels. Ghrelin also reduced liver tissue collagen, MDA, and Bax gene expression, and increased Bcl-2 and eNOS gene expression. The effects on TNF-α, collagen, MDA, Bax, and eNOS were partially reversed in Group IV, suggesting that ghrelin's action could be through modulation of NO levels. Therefore, ghrelin's hepatoprotective effect is partially mediated by NO release.
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Affiliation(s)
- Nashwa N Kabil
- Department of Physiology, Faculty of Pharmacy & Biotechnology, German University in Cairo, Egypt.
| | - Hanan A Seddiek
- Department of Physiology, Kasr Al Aini Faculty of Medicine, Cairo University, Egypt.
| | - Nadia A Yassin
- Department of Physiology, Faculty of Pharmacy & Biotechnology, German University in Cairo, Egypt; Department of Physiology, Kasr Al Aini Faculty of Medicine, Cairo University, Egypt.
| | - Maha M Gamal-Eldin
- Department of Physiology, Faculty of Pharmacy & Biotechnology, German University in Cairo, Egypt; Department of Physiology, Kasr Al Aini Faculty of Medicine, Cairo University, Egypt.
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30
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Cox AG, Saunders DC, Kelsey PB, Conway AA, Tesmenitsky Y, Marchini JF, Brown KK, Stamler JS, Colagiovanni DB, Rosenthal GJ, Croce KJ, North TE, Goessling W. S-nitrosothiol signaling regulates liver development and improves outcome following toxic liver injury. Cell Rep 2014; 6:56-69. [PMID: 24388745 DOI: 10.1016/j.celrep.2013.12.007] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Revised: 10/26/2013] [Accepted: 12/03/2013] [Indexed: 12/21/2022] Open
Abstract
Toxic liver injury is a leading cause of liver failure and death because of the organ's inability to regenerate amidst massive cell death, and few therapeutic options exist. The mechanisms coordinating damage protection and repair are poorly understood. Here, we show that S-nitrosothiols regulate liver growth during development and after injury in vivo; in zebrafish, nitric-oxide (NO) enhanced liver formation independently of cGMP-mediated vasoactive effects. After acetaminophen (APAP) exposure, inhibition of the enzymatic regulator S-nitrosoglutathione reductase (GSNOR) minimized toxic liver damage, increased cell proliferation, and improved survival through sustained activation of the cytoprotective Nrf2 pathway. Preclinical studies of APAP injury in GSNOR-deficient mice confirmed conservation of hepatoprotective properties of S-nitrosothiol signaling across vertebrates; a GSNOR-specific inhibitor improved liver histology and acted with the approved therapy N-acetylcysteine to expand the therapeutic time window and improve outcome. These studies demonstrate that GSNOR inhibitors will be beneficial therapeutic candidates for treating liver injury.
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Affiliation(s)
- Andrew G Cox
- Genetics Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Diane C Saunders
- Genetics Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Peter B Kelsey
- Genetics Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Allie A Conway
- Genetics Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Yevgenia Tesmenitsky
- Cardiovascular Medicine Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Julio F Marchini
- Cardiovascular Medicine Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Kristin K Brown
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | - Jonathan S Stamler
- Institute for Transformative Molecular Medicine and Department of Medicine, Harrington Discovery Institute, Case Western Reserve University and University Hospitals Case Medical Center, Cleveland, OH 44106, USA
| | | | | | - Kevin J Croce
- Cardiovascular Medicine Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Trista E North
- Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA; Harvard Stem Cell Institute, Cambridge, MA 02138, USA.
| | - Wolfram Goessling
- Genetics Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Harvard Stem Cell Institute, Cambridge, MA 02138, USA; Gastroenterology Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Gastrointestinal Cancer Center, Dana-Farber Cancer Institute, Boston, MA 02115, USA; Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA.
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Tormos AM, Taléns-Visconti R, Nebreda AR, Sastre J. p38 MAPK: a dual role in hepatocyte proliferation through reactive oxygen species. Free Radic Res 2013; 47:905-16. [PMID: 23906070 DOI: 10.3109/10715762.2013.821200] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
p38 MAPKs are important mediators of signal transduction that respond to a wide range of extracellular stressors such as UV radiation, osmotic shock, hypoxia, pro-inflammatory cytokines, and oxidative stress. The most abundant family member is p38α, which helps to couple cell proliferation and growth in response to certain damaging stimuli. In fact, increased proliferation and impaired differentiation are hallmarks of p38α-deficient cells. It has been reported that reactive oxygen species (ROS) play a critical role in cytokine-induced p38α activation. Under physiological conditions, p38α can function as a mediator of ROS signaling and either activate or suppress cell cycle progression depending on the activation stimulus. The interplay between cell proliferation, p38 MAPK activation, and ROS production plays an important role in hepatocytes. In fact, low levels of ROS seem to be needed to activate several signaling pathways in response to hepatectomy and to orchestrate liver regeneration. p38 MAPK works as a sensor of oxidative stress and cells that have developed mechanisms to uncouple p38 MAPK activation from oxidative stress are more likely to become tumorigenic. So far, p38α influences the redox balance, determining cell survival, terminal differentiation, proliferation, and senescence. Further studies would be necessary in order to clarify the precise role of p38 MAPK signaling as a redox therapeutical target.
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Affiliation(s)
- A M Tormos
- Department of Physiology, Faculty of Pharmacy, University of Valencia , Valencia , Spain
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Malato Y, Ehedego H, Al-Masaoudi M, Cubero FJ, Bornemann J, Gassler N, Liedtke C, Beraza N, Trautwein C. NF-κB essential modifier is required for hepatocyte proliferation and the oval cell reaction after partial hepatectomy in mice. Gastroenterology 2012; 143:1597-1608.e11. [PMID: 22922425 DOI: 10.1053/j.gastro.2012.08.030] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 08/07/2012] [Accepted: 08/08/2012] [Indexed: 12/14/2022]
Abstract
BACKGROUND & AIMS The transcription factor nuclear factor κB (NF-κB) is activated by the IκB kinase complex. The regulatory subunit of this complex, NF-κB essential modifier (NEMO or IKBKG), is a tumor suppressor. Hepatocyte-specific deletion of NEMO induces chronic liver inflammation that leads to apoptosis, oxidative stress, development of nonalcoholic steatohepatitis, and hepatocarcinogenesis. METHODS We performed partial hepatectomies in mice with hepatocyte-specific disruption of NEMO (Nemo(Δhepa)). Some mice were fed a diet that contained the antioxidant butylated hydroxyanisole (BHA), and others were given daily intraperitoneal injections of the oxidant phenetyl isothiocyanate (PEITC). RESULTS Nemo(Δhepa) mice had impaired liver regeneration after partial hepatectomy and 50% mortality, indicating that NEMO is required for the regenerative response. Liver cells of the mice had a strong oxidative stress response; these cells down-regulated the NF-κB-dependent antioxidant response and reduced levels of proteins that repair DNA double-strand breaks. However, the impairments to hepatocyte proliferation were compensated by a response of oval cells in Nemo(Δhepa) mice. Oval cells expressed low levels of albumin and thereby expressed normal levels of NEMO. Repopulation of the liver with oval cells that expressed NEMO reversed liver damage in Nemo(Δhepa) mice. Interestingly, these mice still developed hepatocellular carcinomas 6 months after partial hepatectomy, whereas Nemo(Δhepa) mice fed the BHA diet were protected from carcinogenesis. CONCLUSIONS In livers of mice, expression of NEMO and activation of NF-κB are required for hepatocyte proliferation and liver regeneration. These mechanisms require control of oxidative stress and DNA integrity.
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Affiliation(s)
- Yann Malato
- Department of Internal Medicine, University Hospital (RWTH), Aachen, Germany
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Abstract
S-adenosylmethionine (AdoMet, also known as SAM and SAMe) is the principal biological methyl donor synthesized in all mammalian cells but most abundantly in the liver. Biosynthesis of AdoMet requires the enzyme methionine adenosyltransferase (MAT). In mammals, two genes, MAT1A that is largely expressed by normal liver and MAT2A that is expressed by all extrahepatic tissues, encode MAT. Patients with chronic liver disease have reduced MAT activity and AdoMet levels. Mice lacking Mat1a have reduced hepatic AdoMet levels and develop oxidative stress, steatohepatitis, and hepatocellular carcinoma (HCC). In these mice, several signaling pathways are abnormal that can contribute to HCC formation. However, injury and HCC also occur if hepatic AdoMet level is excessive chronically. This can result from inactive mutation of the enzyme glycine N-methyltransferase (GNMT). Children with GNMT mutation have elevated liver transaminases, and Gnmt knockout mice develop liver injury, fibrosis, and HCC. Thus a normal hepatic AdoMet level is necessary to maintain liver health and prevent injury and HCC. AdoMet is effective in cholestasis of pregnancy, and its role in other human liver diseases remains to be better defined. In experimental models, it is effective as a chemopreventive agent in HCC and perhaps other forms of cancer as well.
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Affiliation(s)
- Shelly C Lu
- Division of Gastroenterology and Liver Diseases, USC Research Center for Liver Diseases, Southern California Research Center for ALPD and Cirrhosis, Keck School of Medicine, Los Angeles, California 90033, USA.
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Affiliation(s)
- Cristina E Carnovale
- Instituto de Fisiología Experimental-CONICET, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 570-2000 Rosario, Argentina.
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Aharoni-Simon M, Anavi S, Beifuss U, Madar Z, Tirosh O. Nitric oxide, can it be only good? Increasing the antioxidant properties of nitric oxide in hepatocytes by YC-1 compound. Nitric Oxide 2012; 27:248-56. [PMID: 22955014 DOI: 10.1016/j.niox.2012.08.076] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2012] [Revised: 08/05/2012] [Accepted: 08/21/2012] [Indexed: 12/25/2022]
Abstract
The aim of the study was to evaluate the effect of Nitric oxide (NO) on redox changes and fat accumulation in hepatocytes. AML-12 hepatocytes were exposed to the NO donor Diethylenetriamine-NONOate (DETA-NO). DETA-NO led to a dose- and time-dependent increase in lipid accumulation in the cells, measured by Nile red fluorescence. Exposure of the cells to 1mM DETA-NO for 24h increased reactive oxygen species production, mainly peroxides. At the same time, NO induced elevation of reduced glutathione (GSH) and a mild activation of the antioxidant transcription factors Hypoxia-inducible factor 1α (HIF1α) and NF-E2 related factor 2 (Nrf-2). We used 100 μM YC-1 to inhibit HIF1α activity and induce activation of soluble Guanylate Cyclase (sGC). YC-1 alone did not affect fat accumulation, and only moderately increased the expression of Nrf-2-targeted genes Heme oxygenase 1 (Hmox1), NAD(P)H dehydrogenase (quinone 1) (Nqo1) and Glutathione S-transferase α1 (Gstα1). However, YC-1 abolished the negative effect of NO on fat accumulation when administered together. Strikingly, YC-1 potentiated the effect of NO on Nrf-2 activation, thus increasing dramatically the antioxidant properties of NO. Moreover, YC-1 intensified the effect of NO on the expression of peroxisome-proliferator-activated receptor-gamma co-activator 1α (PGC1α) and mitochondrial biogenesis markers. This study suggests that YC-1 may shift the deleterious effects of NO into the beneficial ones, and may improve the antioxidant properties of NO.
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Affiliation(s)
- Michal Aharoni-Simon
- The School of Nutritional Sciences, Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
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Forrester MT, Foster MW. Protection from nitrosative stress: a central role for microbial flavohemoglobin. Free Radic Biol Med 2012; 52:1620-33. [PMID: 22343413 DOI: 10.1016/j.freeradbiomed.2012.01.028] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 01/22/2012] [Accepted: 01/27/2012] [Indexed: 12/31/2022]
Abstract
Nitric oxide (NO) is an inevitable product of life in an oxygen- and nitrogen-rich environment. This reactive diatomic molecule exhibits microbial cytotoxicity, in large part by facilitating nitrosative stress and inhibiting heme-containing proteins within the aerobic respiratory chain. Metabolism of NO is therefore essential for microbial life. In many bacteria, fungi, and protozoa, the evolutionarily ancient flavohemoglobin (flavoHb) converts NO and O(2) to inert nitrate (NO(3)(-)) and undergoes catalytic regeneration via flavin-dependent reduction. Since its identification, widespread efforts have characterized roles for flavoHb in microbial nitrosative stress protection. Subsequent genomic studies focused on flavoHb have elucidated the transcriptional machinery necessary for inducible NO protection, such as NsrR in Escherichia coli, as well as additional proteins that constitute a nitrosative stress protection program. As an alternative strategy, flavoHb has been heterologously employed in higher eukaryotic organisms such as plants and human tumors to probe the function(s) of endogenous NO signaling. Such an approach may also provide a therapeutic route to in vivo NO depletion. Here we focus on the molecular features of flavoHb, the hitherto characterized NO-sensitive transcriptional machinery responsible for its induction, the roles of flavoHb in resisting mammalian host defense systems, and heterologous applications of flavoHb in plant/mammalian systems (including human tumors), as well as unresolved questions surrounding this paradigmatic NO-consuming enzyme.
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Affiliation(s)
- Michael T Forrester
- Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
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Abshagen K, Eipel C, Vollmar B. A critical appraisal of the hemodynamic signal driving liver regeneration. Langenbecks Arch Surg 2012; 397:579-90. [PMID: 22311102 DOI: 10.1007/s00423-012-0913-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Accepted: 01/20/2012] [Indexed: 12/25/2022]
Abstract
BACKGROUND Many aspects of the signaling mechanisms involved in the initiation of hepatic regeneration are under current investigation. Nevertheless, the actual mechanisms switching liver regeneration on and off are still unknown. Hemodynamic changes in the liver following partial hepatectomy have been suggested to be a primary stimulus in triggering liver regeneration. Most of the new knowledge about the impact of hemodynamic changes on liver regeneration is both conceptually important and directly relevant to clinical problems. PURPOSE The purpose of this review is therefore to exclusively address the hemodynamic signal driving the liver regeneration process.
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Affiliation(s)
- Kerstin Abshagen
- Institute for Experimental Surgery, University of Rostock, 18055 Rostock, Germany.
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Differential effects of acyclic nucleoside phosphonates on nitric oxide and cytokines in rat hepatocytes and macrophages. Int Immunopharmacol 2011; 12:342-9. [PMID: 22198073 DOI: 10.1016/j.intimp.2011.12.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2011] [Revised: 11/29/2011] [Accepted: 12/05/2011] [Indexed: 01/12/2023]
Abstract
Acyclic nucleoside phosphonates (ANP) are virostatics effective against viruses like hepatitis B virus and human immunodeficiency virus. Our previous reports indicated immunomodulatory activities of ANP in mouse and human innate immune cells. Recently, evidence has increased that hepatocytes may play an active role in immune regulation of the liver homeostasis or injury. In this study we investigated possible immunomodulatory effects of ANP on rat hepatocytes and macrophages. Nitric oxide (NO) production and secretion of cytokines (IL-1α, IL-1β, IL-2, IL-4, IL-6, IL-10, IL-13, IL-18, IFN-γ, TNF-α and GM-CSF) were analyzed under in vitro conditions. Test compounds included: 9-[2-(phosphonomethoxy)ethyl]adenine (PMEA; adefovir); 9-[2-(phosphonomethoxy)ethyl]-2,6-diaminopurine (PMEDAP); (R)- and (S)-enantiomers of 9-[2-(phosphonomethoxy)propyl]adenine [(R)-PMPA; tenofovir] and [(S)-PMPA]; 9-[2-(phosphonomethoxy)propyl]-2,6-diaminopurine [(R)-PMPDAP] and [(S)-PMPDAP]. The group of test compounds also included their N(6)-substituted derivatives. Some of ANP which are able to induce NO production and cytokine secretion in cultured macrophages possess the same immunobiological activity in isolated hepatocytes. The extent of responses is in range of LPS/IFN-γ stimulation in both types of cells. The effects of active ANP on NO expression and cytokine secretion are dose- and time-dependent. Interestingly, the spectrum of detected cytokines induced by ANP is broader in hepatocytes. The results also confirm immunomodulatory effects of some ANP on rodent macrophages. Moreover, we demonstrate for the first time immunobiological reactivity of primary rat hepatocytes induced by exogenous ANP compounds. The potential of hepatocytes to synthesize cytokines can contribute to better understanding of liver immune function and can serve for pharmacological intervention in liver diseases.
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Mei Y, Thevananther S. Endothelial nitric oxide synthase is a key mediator of hepatocyte proliferation in response to partial hepatectomy in mice. Hepatology 2011; 54:1777-89. [PMID: 21748771 PMCID: PMC3579770 DOI: 10.1002/hep.24560] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Accepted: 07/06/2011] [Indexed: 12/20/2022]
Abstract
UNLABELLED Endothelial nitric oxide synthase (eNOS) is a critical modulator of vascular tone and blood flow and plays major roles in liver physiology and pathophysiology. Nitric oxide (NO) is widely recognized as one of the key humoral factors important for the initiation of liver regeneration in response to partial hepatectomy. Liver regeneration in response to partial hepatectomy is dependent on the efficiency of growth factor-mediated cell-cycle progression. Epidermal growth factor receptor (EGFR) is a critical mediator of multiple hepatic mitogens, such as epidermal growth factor (EGF), transforming growth factor alpha, amphiregulin, and heparin-binding EGF in regenerating livers. However, the functional significance of endothelial nitric oxide synthase (eNOS) expressed in hepatocytes, and its potential role in EGFR-mediated hepatocyte proliferation, remains unexplored. We sought to determine whether eNOS is essential for hepatocyte proliferation in response to partial hepatectomy (PH). Our studies with eNOS knockout (eNOS(-/-) ) mice suggest that eNOS activation is essential for the efficient induction of early events and elicitation of a robust hepatocyte proliferative response to PH. Moreover, eNOS expression is essential for the efficient early induction of matrix metalloprotease-9, a known mediator of extracellular matrix remodeling and growth factor activation in regenerating livers. Our in vitro studies suggest that eNOS is a critical mediator of EGF-induced hepatocyte proliferation, potentially via its influence on the induction of early growth response-1 (Egr-1) and phosphorylation of c-Jun--known mediators of cell-cycle progression. EGF-induced eNOS phosphorylation at Ser 1177 is dependent on the phosphorylation and activation of EGFR/PI3 kinase/AKT signaling in hepatocytes. CONCLUSION Collectively, these results highlight a hitherto unrecognized role for eNOS activation in hepatocyte proliferation with implications for targeted therapies to enhance liver regenerative response in chronic disorders.
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Affiliation(s)
- Yu Mei
- Department of Pediatrics, Section of Gastroenterology, Hepatology & Nutrition, Baylor College of Medicine, and Texas Children’s Liver Center, Houston, TX
| | - Sundararajah Thevananther
- Department of Pediatrics, Section of Gastroenterology, Hepatology & Nutrition, Baylor College of Medicine, and Texas Children’s Liver Center, Houston, TX.,Address for Correspondence: Sundararajah Thevananther, Ph.D., Associate Professor of Pediatrics-Gastroenterology, Hepatology & Nutrition, Baylor College of Medicine, 1102 Bates Street, Feigin Center-Rm 860B, Houston, TX 77030, Tel: 832-824-3753, Fax: 832-825-3811,
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Abdel-Salam OM, Mohammed NA, Sleem AA. The effects of trimetazidine on lipopolysaccharide-induced oxidative stress in mice. EXCLI JOURNAL 2011; 10:162-172. [PMID: 27857673 PMCID: PMC5109013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Accepted: 10/03/2011] [Indexed: 11/28/2022]
Abstract
The effects of trimetazidine, a novel anti-ischemic agent, on the development of oxidative stress induced in mice with lipopolysaccharide endotoxin were investigated. The drug was administered orally once daily at doses of 1.8, 3.6 or 7.2 mg/kg for two days prior to intraperitoneal (i.p.) injection of lipopolysaccharide E (200 μg/kg) and at time of endotoxin administration. Mice were euthanized 4 h after administration of the lipopolysaccharide. Lipid peroxidation (malondialdehyde; MDA), reduced glutathione (GSH) and nitric oxide (nitrite/nitrate) concentrations were measured in brain and liver. The administration of lipopolysaccharide increased oxidative stress in both the brain and liver tissue. MDA increased by 33.9 and 107.1 %, GSH decreased by 23.9 and 84.3 % and nitric oxide increased 70.3 and 48.4 % in the brain and liver, respectively. Compared with the lipopolysaccharide control group, brain MDA decreased by 26.2 and 36.7 %, while GSH increased by 18.2 and 25.8 % after the administration of trimetazidine at 3.6 and 7.2 mg/kg, respectively. Brain nitric oxide decreased by 45.3, 50.8 and 57.0 % by trimetazidine at 1.8, 3.6 and 7.2 mg/kg, respectively. In the liver, MDA decreased by 18.7, 30.7 and 49.4 % and GSH increased by 150.3, 204.8 and 335.4 % following trimetazidine administration at 1.8, 3.6 and 7.2 mg/kg. Meanwhile, nitric oxide decreased by 17.3 % by 7.2 mg/kg of trimetazidine. These results indicate that administration of trimetazidine in the presence of mild systemic inflammatory response alleviates oxidative stress in the brain and liver.
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Affiliation(s)
- Omar M.E. Abdel-Salam
- Department of Toxicology and Narcotics, National Research Centre, Cairo,*To whom correspondence should be addressed: Omar M.E. Abdel-Salam, Department of Toxicology and Narcotics, National Research Centre, Dokki, Cairo/Egypt; FAX: 202-33370931, E-mail:
| | | | - Amany A. Sleem
- Department of Pharmacology, National Research Centre, Cairo
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Yoshida D, Akahoshi T, Kawanaka H, Yamaguchi S, Kinjo N, Taketomi A, Tomikawa M, Shirabe K, Maehara Y, Hashizume M. Roles of vascular endothelial growth factor and endothelial nitric oxide synthase during revascularization and regeneration after partial hepatectomy in a rat model. Surg Today 2011; 41:1622-9. [PMID: 21969195 DOI: 10.1007/s00595-010-4484-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2010] [Accepted: 12/20/2010] [Indexed: 01/13/2023]
Abstract
PURPOSE Angiogenesis is an essential process in liver regeneration. Nitric oxide (NO) and vascular endothelial growth factor (VEGF) are the main regulators of normal and pathological angiogenesis. This study aimed to determine the roles of NO derived from endothelial nitric oxide synthase (eNOS) and VEGF in sinusoidal endothelial cell (SEC) proliferation during liver regeneration. METHODS Sprague-Dawley rats underwent a 70% partial hepatectomy (PHx), and were euthanized 0, 24, 48, 72, or 168 h later. Liver regeneration and SEC proliferation were evaluated. The protein expression of VEGF and eNOS was examined by a Western blot analysis. The rats were also treated with the NO synthase inhibitor N (G)-nitro-L-arginine-methyl ester (L-NAME) to examine its effects on liver regeneration and SEC proliferation. RESULTS The proliferating cell nuclear antigen (PCNA) labeling index of hepatocytes was significantly increased at 24 h after PHx. The eNOS protein expression and NO production were significantly increased from 72 to 168 h. The expression of VEGF protein was significantly increased at 72 h. L-NAME significantly inhibited the increases in the liver mass and decreased the PCNA labeling index of hepatocytes at 24 h. L-NAME also inhibited the induction of VEGF protein at 72 h. CONCLUSIONS Endothelial NOS and VEGF coordinately regulate SEC proliferation during liver regeneration. Sinusoidal endothelial cell proliferation is necessary and is an important step in liver regeneration.
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Affiliation(s)
- Daisuke Yoshida
- Department of Disaster and Emergency Medicine, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan
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Wang G, Yan Q, Woods A, Aubrey LA, Feng Q, Beier F. Inducible nitric oxide synthase-nitric oxide signaling mediates the mitogenic activity of Rac1 during endochondral bone growth. J Cell Sci 2011; 124:3405-13. [PMID: 21965529 DOI: 10.1242/jcs.076026] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Coordinated proliferation and differentiation of growth plate chondrocytes controls endochondral bone growth and final height in humans, and disruption of this process results in diseases of the growing and adult skeleton, such as chondrodysplasias or osteoarthritis. We had shown recently that chondrocyte-specific deletion of the gene Rac1 in mice leads to severe dwarfism due to reduced chondrocyte proliferation, but the molecular pathways involved remained unclear. Here, we demonstrate that Rac1-deficient chondrocytes have severely reduced levels of inducible nitric oxide synthase (iNOS) protein and nitric oxide (NO) production. NO donors reversed the proliferative effects induced by Rac1 deficiency, whereas inhibition of NO production mimicked the effects of Rac1 loss of function. Examination of the growth plate of iNOS-deficient mice revealed reduced chondrocyte proliferation and expression of cyclin D1, resembling the phenotype of Rac1-deficient growth plates. Finally, we demonstrate that Rac1-NO signaling inhibits the expression of ATF3, a known suppressor of cyclin D1 expression in chondrocytes. In conclusion, our studies identify the iNOS-NO pathway as a novel mediator of mitogenic Rac1 signaling and indicate that it could be a target for growth disorder therapies.
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Affiliation(s)
- Guoyan Wang
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, N6A 5C1, Canada
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Eyler CE, Wu Q, Yan K, MacSwords JM, Chandler-Militello D, Misuraca KL, Lathia JD, Forrester MT, Lee J, Stamler JS, Goldman SA, Bredel M, McLendon RE, Sloan AE, Hjelmeland AB, Rich JN. Glioma stem cell proliferation and tumor growth are promoted by nitric oxide synthase-2. Cell 2011; 146:53-66. [PMID: 21729780 DOI: 10.1016/j.cell.2011.06.006] [Citation(s) in RCA: 244] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Revised: 03/04/2011] [Accepted: 06/03/2011] [Indexed: 12/20/2022]
Abstract
Malignant gliomas are aggressive brain tumors with limited therapeutic options, and improvements in treatment require a deeper molecular understanding of this disease. As in other cancers, recent studies have identified highly tumorigenic subpopulations within malignant gliomas, known generally as cancer stem cells. Here, we demonstrate that glioma stem cells (GSCs) produce nitric oxide via elevated nitric oxide synthase-2 (NOS2) expression. GSCs depend on NOS2 activity for growth and tumorigenicity, distinguishing them from non-GSCs and normal neural progenitors. Gene expression profiling identified many NOS2-regulated genes, including the cell-cycle inhibitor cell division autoantigen-1 (CDA1). Further, high NOS2 expression correlates with decreased survival in human glioma patients, and NOS2 inhibition slows glioma growth in a murine intracranial model. These data provide insight into how GSCs are mechanistically distinct from their less tumorigenic counterparts and suggest that NOS2 inhibition may be an efficacious approach to treating this devastating disease.
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Affiliation(s)
- Christine E Eyler
- Department of Stem Cell Biology and Regenerative Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
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Francés DE, Ronco MT, Ingaramo PI, Monti JA, Pisani GB, Parody JP, Pellegrino JM, Carrillo MC, Martín-Sanz P, Carnovale CE. Role of reactive oxygen species in the early stages of liver regeneration in streptozotocin-induced diabetic rats. Free Radic Res 2011; 45:1143-53. [PMID: 21740310 DOI: 10.3109/10715762.2011.602345] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Diabetes mellitus is a risk factor for prognosis after liver resection. In previous work, we found a pro-apoptotic state in the diabetic rat liver. In this work, this was also observed 1 hour post-partial hepatectomy (PH) and resulted in a deficient regenerative response 24 hours post-PH. Treatment with insulin and/or Desferoxamine (DES) (iron chelator) or Tempol (TEM) (free radicals scavenger) was effective in preventing the liver reactive oxygen species (ROS) production induced by diabetic state. High levels of ROS play a role in hepatic lipid peroxidation in diabetes before and after PH, and lead to increased pro-apoptotic events, which contribute to a reduced regenerative response. This becomes of relevance for the potential use of antioxidants/free radical scavengers plus insulin for improvement of post-surgical recovery of diabetic patients subjected to a PH.
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Affiliation(s)
- Daniel E Francés
- Instituto de Fisiología Experimental (IFISE-CONICET), Suipacha 570, 2000 Rosario, Argentina
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45
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Kim RD, Kim JS, Watanabe G, Mohuczy D, Behrns KE. Liver regeneration and the atrophy-hypertrophy complex. Semin Intervent Radiol 2011; 25:92-103. [PMID: 21326550 DOI: 10.1055/s-2008-1076679] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The atrophy-hypertrophy complex (AHC) refers to the controlled restoration of liver parenchyma following hepatocyte loss. Different types of injury (e.g., toxins, ischemia/reperfusion, biliary obstruction, and resection) elicit the same hypertrophic response in the remnant liver. The AHC involves complex anatomical, histological, cellular, and molecular processes. The signals responsible for these processes are both intrinsic and extrinsic to the liver and involve both physical and molecular events. In patients in whom resection of large liver malignancies would result in an inadequate functional liver remnant, preoperative portal vein embolization may increase the remnant liver sufficiently to permit aggressive resections. Through continued basic science research, the cellular mechanisms of the AHC may be maximized to permit curative resections in patients with potentially prohibitive liver function.
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Affiliation(s)
- Robin D Kim
- Department of Surgery, Division of General and GI Surgery, University of Florida, Gainesville, Florida
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Hong JY, F Sato E, Hiramoto K, Nishikawa M, Inoue M. Mechanism of Liver Injury during Obstructive Jaundice: Role of Nitric Oxide, Splenic Cytokines, and Intestinal Flora. J Clin Biochem Nutr 2011; 40:184-93. [PMID: 18398495 PMCID: PMC2275763 DOI: 10.3164/jcbn.40.184] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2006] [Accepted: 10/02/2006] [Indexed: 01/13/2023] Open
Abstract
To elucidate the roles of enteric bacteria and immunological interactions among liver, spleen and intestine in the pathogenesis of liver injury during obstructive jaundice, we studied the effects of antibiotics and splenectomy on bile-duct-ligated C57BL mice. When animals were subjected to bile-duct-ligation (BDL), plasma levels of bilirubin, alanine aminotransferase and aspartate aminotransferase increased markedly. However, the increases in plasma transaminases were significantly lower in splenectomized or antibiotics-treated groups than in the control BDL group. Histological examination revealed that liver injury was also low in the two groups. BDL markedly increased plasma level of interferon-γ (IFN-γ) and the expression of inducible nitric oxide synthase (iNOS) in liver and spleen. These changes were suppressed either by splenectomy or administration of antibiotics. Kinetic analysis revealed that BDL-induced liver injury and the increase of interleukin-10 (IL-10) and INF-γ were lower in iNOS−/− than in wild type animals. BDL markedly increased the expression of IgA in colonic mucosa. These observations suggest that enteric bacteria, nitric oxide and cytokines including IFN-γ and IL-10 derived from spleen and intestines form a critical network that determines the extent of liver injury during obstructive jaundice.
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Affiliation(s)
- Ji-Young Hong
- Department of Biochemistry and Molecular Pathology, Osaka City University Medical School, 1-4-3 Asahimachi, Abeno, Osaka 545-8585, Japan
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Pritchard MT, Malinak RN, Nagy LE. Early growth response (EGR)-1 is required for timely cell-cycle entry and progression in hepatocytes after acute carbon tetrachloride exposure in mice. Am J Physiol Gastrointest Liver Physiol 2011; 300:G1124-31. [PMID: 21415413 PMCID: PMC3119116 DOI: 10.1152/ajpgi.00544.2010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Cell-cycle induction in hepatocytes protects from prolonged tissue damage after toxic liver injury. Early growth response (Egr)-1(-/-) mice exhibit increased liver injury after carbon tetrachloride (CCl(4)) exposure and reduced TNF-α production. Because TNF-α is required for prompt cell-cycle induction after liver injury, here, we tested the hypothesis that Egr-1 is required for timely hepatocyte entry into the cell cycle after CCl(4)-induced liver injury. Acute liver injury was induced by a single injection of CCl(4). Assays were employed to assess indices of the cell cycle in liver after CCl(4) exposure. Bromodeoxyuridine incorporation peaked in wild-type mice at 48 h after CCl(4) but was reduced by 80% in Egr-1(-/-) mice. Proliferating-cell nuclear-antigen immunohistochemistry revealed blocks in cell-cycle entry and progression to DNA synthesis in Egr-1-deficient mice 48 h after CCl(4). Cyclin D, important for G0/G1 progression, was reduced at baseline and 36 h after CCl(4). Cyclin E1, required for G1/S-phase transition, was reduced in Egr-1(-/-) mice 24 and 48 h after CCl(4) exposure and was associated with reduced phosphorylation of the retinoblastoma protein. Proliferation in Egr-1(-/-) mice was delayed, rather than blocked, because indices of cell-cycle progression were restored 72 h after CCl(4) exposure. We concluded that Egr-1 was required for prompt cell-cycle entry (G0- to G1-phase) and G1/S-phase transition after toxic liver injury. These data support the hypothesis that Egr-1 provides hepatoprotection in the CCl(4)-injured liver, attributable, in part, to timely cell-cycle induction and progression.
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Affiliation(s)
| | | | - Laura E. Nagy
- Departments of 1Pathobiology and ,2Gastroenterology, Cleveland Clinic, ,3Department of Molecular Medicine, Case Western Reserve University, Cleveland, Ohio
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Spruss A, Kanuri G, Uebel K, Bischoff SC, Bergheim I. Role of the inducible nitric oxide synthase in the onset of fructose-induced steatosis in mice. Antioxid Redox Signal 2011; 14:2121-35. [PMID: 21083420 DOI: 10.1089/ars.2010.3263] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
To test the hypothesis that the inducible nitric oxide synthase (iNOS) is involved in mediating the toll-like receptor 4-dependent effects on the liver in the onset of fructose-induced steatosis, wild-type and iNOS knockout (iNOS(-/-)) mice were either fed tap water or 30% fructose solution for 8 weeks. Chronic consumption of 30% fructose solution led to a significant increase in hepatic steatosis and inflammation as well as plasma alanine-aminotransferase levels in wild-type mice. This effect of fructose feeding was markedly attenuated in iNOS(-/-) mice. Hepatic lipidperoxidation, concentration of phospho-IκB, nuclear factor κB activity, and tumor necrosis factor-α mRNA level were significantly increased in fructose-fed wild-type mice, whereas in livers of fructose-fed iNOS(-/-) mice, lipidperoxidation, phospho-IκB, nuclear factor κB activity, and tumor necrosis factor-α expression were almost at the level of controls. However, portal endotoxin levels and hepatic myeloid differentiation factor 88 expression were significantly higher in both fructose-fed groups compared to controls. Taken together, these data suggest that (i) the formation of reactive oxygen species in liver is a key factor in the onset of fatty liver and (ii) iNOS is involved in mediating the endotoxin/toll-like receptor 4-dependent effects in the development of fructose-induced fatty liver.
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Affiliation(s)
- Astrid Spruss
- Department of Nutritional Medicine, University of Hohenheim, Stuttgart, Germany
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Wang K, Brems JJ, Gamelli RL, Holterman AX. C/EBPα and C/EBPβ binding proteins modulate hepatocyte apoptosis through iNOS signaling pathway. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2011; 1813:1395-403. [PMID: 21539866 DOI: 10.1016/j.bbamcr.2011.04.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 04/06/2011] [Accepted: 04/11/2011] [Indexed: 01/05/2023]
Abstract
Inducible nitric oxide synthase (iNOS) and nitric oxide (NO) involve many pathophysiologic conditions. The expression of iNOS is regulated at multiple stages. Presently, the regulatory details of iNOS signaling are still unclear. This study aimed to investigate the regulatory role of C/EBPα and C/EBPβ in iNOS signaling pathway. By employing the techniques such as EMSA, ChIP assay, site-directed mutagenesis, and siRNA silencing, the relationship between iNOS and C/EBPα/C/EBPβ in rat hepatocytes was clarified. iNOS promoter was the direct transcriptional targets of the C/EBPα, C/EBPβ, and NF-κB binding proteins. There was the interactive influence between NF-κB and C/EBPα/C/EBPβ. The expression of iNOS was modulated by C/EBPα/C/EBPβ transcription factors. Moreover, the iNOS expression mediated glycochenodeoxycholate (GCDC)-induced apoptosis in hepatocytes. C/EBPα/C/EBPβ binding proteins could affect the GCDC-induced apoptosis through iNOS cascade. These findings indicate that C/EBPα and C/EBPβ regulate the iNOS expression, which may further modify cell responses such as apoptosis and cell survival.
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Affiliation(s)
- Kewei Wang
- Departments of Pediatrics and Surgery/Section of Pediatric Surgery, Rush University Medical Center, Chicago, IL 60612, USA.
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Varela-Rey M, Beraza N, Lu SC, Mato JM, Martínez-Chantar ML. Role of AMP-activated protein kinase in the control of hepatocyte priming and proliferation during liver regeneration. Exp Biol Med (Maywood) 2011; 236:402-8. [PMID: 21427236 DOI: 10.1258/ebm.2011.010352] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The enzyme AMP-activated protein kinase (AMPK) is the main energy sensor in cells and is responsible for controlling the balance of anabolic/catabolic processes under metabolic stress conditions. This metabolic control exerted by AMPK is critical for energy-demanding situations, such as liver regeneration. Immediately after partial hepatectomy (PH), the liver undergoes the priming phase, mediated by the proinflammatory cytokines tumor necrosis factor (TNF) and interleukin-6, which promote responsiveness of hepatocytes to growth factors, such as hepatocyte growth factor (HGF) and epidermal growth factor, which lead to proliferation. In addition to its metabolic function, AMPK is likely to be a key mediator in both hepatocyte priming and the proliferative phases, induced by TNF-α and HGF, respectively. TNF-α-induced AMPK activation has been shown to be necessary for nuclear factor κappa B (NF-κB)-induced inducible nitric oxide synthase expression and for blocking TNF-α-induced apoptosis. On the other hand, HGF-induced LKB1/AMPK activation has been found to play a critical role in controlling Hu antigen R cytosolic localization and endothelial nitric oxide synthase activation, and consequently Cyclin D1 and Cyclin A expressions, and nitric oxide generation, respectively. During PH, levels of S-adenosylmethionine (SAMe), the principal methyl donor in the liver, have to decrease to allow liver proliferation. Our studies also show that SAMe inhibits hepatocyte proliferation by controlling the hepatocyte's responsiveness to mitogenic signals such as HGF through the inhibition of AMPK activity. In summary, these data highlight the essential role of AMPK in controlling the balance between hepatocyte metabolic adaptations, cell cycle progression and apoptosis during liver regeneration.
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Affiliation(s)
- Marta Varela-Rey
- CIC bioGUNE, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (Ciberehd), Technology Park of Bizkaia, 48160-Derio, Bizkaia, Spain.
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