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A Functional Polymorphism-Mediated Disruption of EGR1/ADAM10 Pathway Confers the Risk of Sepsis Progression. mBio 2019; 10:mBio.01663-19. [PMID: 31387910 PMCID: PMC6686044 DOI: 10.1128/mbio.01663-19] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Increasing evidence has indicated that single nucleotide polymorphisms (SNPs) are related to the susceptibility of sepsis and might provide potential evidence for the mechanisms of sepsis. Our recent preliminary study showed that the ADAM10 genetic polymorphism was clinically associated with the development of sepsis, and little is known about the underlying mechanism. The aim of this study was to confirm the association between the ADAM10 promoter rs653765 G→A polymorphism and the progression of sepsis and to discover the underlying mechanism. Clinical data showed that the rs653765 G→A polymorphism was positively correlated with the development of sepsis, as evidenced by a multiple-center case-control association study with a large sample size, and showed that EGR1 and ADAM10 levels were associated well with the different subtypes of sepsis patients. In vitro results demonstrated that the rs653765 G→A variants could functionally modulate ADAM10 promoter activity by altering the binding of the EGR1 transcription factor (TF) to the ADAM10 promoter, affecting the transcription and translation of the ADAM10 gene. Electrophoretic mobility shift assay (EMSA) followed by chromatin immunoprecipitation (ChIP) assay indicated the direct interaction. Functional studies further identified that the EGR1/ADAM10 pathway is important for the inflammatory response. EGR1 intervention in vivo decreased host proinflammatory cytokine secretion and rescued the survival and tissue injury of the mouse endotoxemia model.IMPORTANCE Sepsis is characterized as life-threatening organ dysfunction, with unacceptably high mortality. Evidence has indicated that functional SNPs within inflammatory genes are associated with susceptibility, progression, and prognosis of sepsis. These mechanisms on which these susceptible sites depended often suggest the key pathogenesis and potential targets in sepsis. In the present study, we confirmed that a functional variant acts as an important genetic factor that confers the progression of sepsis in a large sample size and in multiple centers and revealed that the variants modulate the EGR1/ADAM10 pathway and influence the severity of sepsis. We believe that we provide an important insight into this new pathway involving the regulation of inflammatory process of sepsis based on the clinical genetic evidence, which will enhance the understanding of nosogenesis of sepsis and provide the potential target for inflammation-related diseases.
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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: 29] [Impact Index Per Article: 4.8] [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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Okazaki H, Takeda S, Kakizoe K, Taniguchi A, Tokuyasu M, Himeno T, Ishii H, Kohro-Ikeda E, Haraguchi K, Watanabe K, Aramaki H. Bisphenol AF as an Inducer of Estrogen Receptor β (ERβ): Evidence for Anti-estrogenic Effects at Higher Concentrations in Human Breast Cancer Cells. Biol Pharm Bull 2018; 40:1909-1916. [PMID: 29093337 DOI: 10.1248/bpb.b17-00427] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bisphenols are endocrine disruptors that are widely found in the environment. Accumulating experimental evidence suggests an adverse interaction between bisphenols and estrogen signaling. Most studies have performed experiments that focused on estrogen receptor (ER) engagement by bisphenols. Therefore, the effects of bisphenols on the expression of ERα (ESR1) and ERβ (ESR2) remain largely unknown. In the present study, we examined the effects of four bisphenols: bisphenol A (BPA), bisphenol B (BPB), bisphenol S (BPS), and bisphenol AF (BPAF), on estrogen signaling in two human breast cancer cell lines (MCF-7 and SK-BR-3). Among these bisphenols, BPAF up-regulated the expression of ERβ, and this was coupled with the abrogation of estrogen response element (ERE)-mediated transcriptional activities as well as the down-regulation of Cdc2 expression in MCF-7 cells, without influencing the expression of ERα. BPAF functioned as an agonist of ERα at lower concentrations (nanomolar order), but did not exhibit any modulatory action on ERα transiently expressed in SK-BR-3 cells in the presence or absence of 17β-estradiol (E2) at higher concentrations (micromolar order). The introduction of ERβ cDNA resulted in greater reductions in MCF-7 cell viability than with BPAF alone. Since ERβ is a suppressive molecule of ERα function, these results provide rational evidence for BPAF functioning as an anti-estrogenic compound via the induction of ERβ at higher concentrations.
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Affiliation(s)
| | - Shuso Takeda
- Laboratory of Xenobiotic Metabolism and Environmental Toxicology, Faculty of Pharmaceutical Sciences, Hiroshima International University (HIU)
| | | | - Aya Taniguchi
- Department of Molecular Biology, Daiichi University of Pharmacy
| | - Miki Tokuyasu
- Department of Molecular Biology, Daiichi University of Pharmacy
| | - Taichi Himeno
- Department of Molecular Biology, Daiichi University of Pharmacy
| | - Hiroyuki Ishii
- Department of Molecular Biology, Daiichi University of Pharmacy
| | | | | | - Kazuhito Watanabe
- Center for Supporting Pharmaceutical Education, Daiichi University of Pharmacy
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Zhou H, Yu M, Roychowdhury S, Sanz-Garcia C, Pollard KA, McMullen MR, Liu X, Li X, Nagy LE. Myeloid-MyD88 Contributes to Ethanol-Induced Liver Injury in Mice Linking Hepatocellular Death to Inflammation. Alcohol Clin Exp Res 2017; 41:719-726. [PMID: 28165624 PMCID: PMC5391031 DOI: 10.1111/acer.13345] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 01/29/2017] [Indexed: 12/18/2022]
Abstract
BACKGROUND Toll-like receptor 4 (TLR4) is critical for ethanol (EtOH)-induced liver injury. TLR4 signaling is mediated by 2 proximal adaptor molecules: myeloid differentiation primary response protein (MyD88) and TLR-domain-containing adaptor-inducing interferon-β (TRIF). Studies utilizing global knockouts of MyD88 and TRIF identified a predominant role for TRIF signaling in the progression of EtOH-induced liver injury. In contrast, IL-1 receptor, which signals solely via the MyD88 pathway, is also known to mediate EtOH-induced liver injury. We postulated that a cell-specific role for MyD88 in myeloid cells might explain these apparently discrepant roles of MyD88. Here we made use of myeloid-specific MyD88-deficient (MyD88LysM-KO ) mice generated by crossing LysM-CRE mice with MyD88fl/fl mice to test this hypothesis. METHODS MyD88LysM-KO and littermate controls were fed a Lieber-DeCarli EtOH-containing diet or pair-fed control diets for 25 days. RESULTS Littermate control, but not MyD88LysM-KO , mice developed early stages of EtOH-induced liver injury including elevated plasma alanine aminotransferase and increased hepatic triglycerides. Lobular inflammation and expression of pro-inflammatory cytokines/chemokines was increased in control but not MyD88LysM-KO . Further, EtOH-induced inflammasome activation, indicated by the presence of cleaved caspase-1 and mature IL-1β protein, was also ameliorated in livers of MyD88LysM-KO mice. In contrast, chronic EtOH-induced apoptosis, assessed via TUNEL staining, was independent of myeloid-MyD88 expression. CONCLUSIONS Collectively, these data demonstrate a cell-specific role for MyD88 in the development of chronic EtOH-induced liver injury. While MyD88LysM-KO still exhibited hepatocellular apoptosis in response to chronic EtOH, the absence of MyD88 on myeloid cells prevented the development of hepatic steatosis and inflammation.
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Affiliation(s)
- Hao Zhou
- Department of Immunology, Cleveland Clinic, Cleveland, OH
| | - Minja Yu
- Department of Immunology, Cleveland Clinic, Cleveland, OH
| | - Sanjoy Roychowdhury
- Department of Pathobiology, Cleveland Clinic, Cleveland, OH
- Department of Molecular Medicine, Case Western Reserve University, Cleveland, Ohio
| | | | | | | | - Xiuli Liu
- Department of Anatomic Pathology, Cleveland Clinic, Cleveland, OH
| | - Xiaoxia Li
- Department of Immunology, Cleveland Clinic, Cleveland, OH
- Department of Molecular Medicine, Case Western Reserve University, Cleveland, Ohio
| | - Laura E. Nagy
- Department of Pathobiology, Cleveland Clinic, Cleveland, OH
- Department of Gastroenterology/Hepatology, Cleveland Clinic, Cleveland, OH
- Department of Molecular Medicine, Case Western Reserve University, Cleveland, Ohio
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Pang C, Shi L, Sheng Y, Zheng Z, Wei H, Wang Z, Ji L. Caffeic acid attenuated acetaminophen-induced hepatotoxicity by inhibiting ERK1/2-mediated early growth response-1 transcriptional activation. Chem Biol Interact 2016; 260:186-195. [PMID: 27720869 DOI: 10.1016/j.cbi.2016.10.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 09/22/2016] [Accepted: 10/05/2016] [Indexed: 12/20/2022]
Abstract
Caffeic acid (CA) is a natural compound abundant in fruits, coffee and plants. This study aims to investigate the involved mechanism of the therapeutic detoxification of CA against acetaminophen (APAP)-induced hepatotoxicity. CA (10, 30 mg/kg) was orally given to mice at 1 h after mice were pre-administrated with APAP (300 mg/kg). The therapeutic detoxification of CA against APAP-induced hepatotoxicity was observed by detecting serum aminotransferases, liver malondialdehyde (MDA) amount and liver histological evaluation in vivo. CA reduced APAP-induced increase in the mRNA expression of early growth response 1 (Egr1) in hepatocytes, and inhibited APAP-induced Egr1 transcriptional activation in vitro and in vivo. CA reduced the increased expression of growth arrest and DNA-damage-inducible protein (Gadd45)α induced by APAP in hepatocytes. Moreover, Egr1 siRNA reduced Gadd45α expression and reversed APAP-induced cytotoxicity in hepatocytes. Further results showed that CA blocked APAP-induced activation of extracellular-regulated protein kinase (ERK1/2) signaling cascade in vivo and in vitro. In addition, the application of ERK1/2 inhibitors (PD98059 and U0126) abrogated the nuclear translocation of Egr1 induced by APAP in hepatocytes. In conclusion, this study demonstrated the therapeutic detoxification of CA against APAP-induced liver injury, and the inhibition of CA on ERK1/2-mediated Egr1 transcriptional activation was involved in this process.
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Affiliation(s)
- Chun Pang
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, China; Center for Traditional Chinese Medicine and Systems Biology, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Liang Shi
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yuchen Sheng
- Center for Drug Safety Evaluation and Research, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
| | - Zhiyong Zheng
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Hai Wei
- Center for Traditional Chinese Medicine and Systems Biology, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - Zhengtao Wang
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Lili Ji
- Shanghai Key Laboratory of Complex Prescription and MOE Key Laboratory for Standardization of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, Shanghai, China.
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Zheng Z, Shi L, Sheng Y, Zhang J, Lu B, Ji L. Chlorogenic acid suppresses monocrotaline-induced sinusoidal obstruction syndrome: The potential contribution of NFκB, Egr1, Nrf2, MAPKs and PI3K signals. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2016; 46:80-89. [PMID: 27438897 DOI: 10.1016/j.etap.2016.07.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2016] [Revised: 07/01/2016] [Accepted: 07/05/2016] [Indexed: 06/06/2023]
Abstract
Hepatic sinusoidal obstruction syndrome (SOS) is a highly lethal liver disease. This study aims to observe the protection and its engaged mechanism of chlorogenic acid (CGA) against monocrotaline (MCT)-induced SOS. Results of detecting liver ascites, measuring serum transaminases, liver histological evaluation and scanning electron microscope observation all demonstrated that CGA prevented MCT-induced SOS in rats. CGA reduced MCT-induced increased liver myeloperoxidase (MPO) activity, tumor necrosis factor (TNF)α and interleukin (IL)-1β mRNA expression, toll-like receptor (TLR)-2,3,6,9 expression, and nuclear factor κB (NFκB) transcriptional activation. CGA also decreased MCT-induced early growth response1 (Egr1) activation. CGA reduced MCT-induced elevated liver malondialdehyde (MDA) amount and enhanced nuclear translocation of nuclear factor erythroid 2-related factor 2 (Nrf2). CGA blocked MCT-induced PI3K and MAPKs activation. In conclusion, this study demonstrates the protection of CGA against MCT-induced SOS. Transcriptional factor NFκB, Egr1 and Nrf2-regulated inflammation, coagulation-fibrinolysis, and antioxidant, and PI3K and MAPKs all contribute to such protection.
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Affiliation(s)
- Zhiyong Zheng
- Shanghai Key Laboratory of Complex Prescription, MOE Key Laboratory for Standardization of Chinese Medicines, SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Liang Shi
- Shanghai Key Laboratory of Complex Prescription, MOE Key Laboratory for Standardization of Chinese Medicines, SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Yuchen Sheng
- Center for Drug Safety Evaluation and Research, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Jiaqi Zhang
- Shanghai Key Laboratory of Complex Prescription, MOE Key Laboratory for Standardization of Chinese Medicines, SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Bin Lu
- Shanghai Key Laboratory of Complex Prescription, MOE Key Laboratory for Standardization of Chinese Medicines, SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China
| | - Lili Ji
- Shanghai Key Laboratory of Complex Prescription, MOE Key Laboratory for Standardization of Chinese Medicines, SATCM Key Laboratory for New Resources and Quality Evaluation of Chinese Medicines, Institute of Chinese Materia Medica, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China.
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Cho HI, Hong JM, Choi JW, Choi HS, Hwan Kwak J, Lee DU, Kook Lee S, Lee SM. β-Caryophyllene alleviates D-galactosamine and lipopolysaccharide-induced hepatic injury through suppression of the TLR4 and RAGE signaling pathways. Eur J Pharmacol 2015; 764:613-621. [PMID: 26254779 DOI: 10.1016/j.ejphar.2015.08.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Revised: 07/15/2015] [Accepted: 08/04/2015] [Indexed: 02/08/2023]
Abstract
Agastache rugosa (A. rugosa, Labiatae), a perennial herb spread throughout Korean fields, is widely consumed as a wild edible vegetable and is used in folk medicine. This study examined the hepatoprotective mechanisms of β-caryophyllene (BCP), a major bicyclic sesquiterpene of A. rugosa, against D-galactosamine (GalN) and lipopolysaccharide (LPS)-induced hepatic failure. Mice were given an intraperitoneal injection of BCP (50, 100 and 200 mg/kg) 1 h before GalN (800 mg/kg)/LPS (40 μg/kg) injection and were killed 1 h or 6 h after GalN/LPS injection. GalN/LPS markedly increased mortality and serum aminotransferase activity, both of which were attenuated by BCP. BCP also attenuated increases in serum tumor necrosis factor-α, interleukin 6, and high-mobility group protein B1 levels by GalN/LPS. GalN/LPS significantly increased toll-like receptor (TLR) 4 and receptor for advanced glycation end products (RAGE) protein expression, extracellular signal-related kinase, p38 and c-Jun N-terminal kinase phosphorylation, nuclear factor κB (NF-κB), early growth response protein-1, and macrophage inflammatory protein-2 protein expression. These increases were attenuated by BCP. Furthermore, BCP suppressed increased TLR4 and RAGE protein expression and proinflammatory cytokines production in LPS-treated isolated Kupffer cells. Our findings suggest that BCP protects against GalN/LPS-induced liver injury through down-regulation of the TLR4 and RAGE signaling.
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Affiliation(s)
- Hong-Ik Cho
- School of Pharmacy, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Jeong-Min Hong
- School of Pharmacy, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Joo-Wan Choi
- School of Pharmacy, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Hyo-Sun Choi
- School of Pharmacy, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Jong Hwan Kwak
- School of Pharmacy, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea
| | - Dong-Ung Lee
- Division of Bioscience, Dongguk University, Gyeongju 780-714, Republic of Korea
| | - Sang Kook Lee
- College of Pharmacy, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sun-Mee Lee
- School of Pharmacy, Sungkyunkwan University, 300 Cheoncheon-dong, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea.
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Cresci GA, Allende D, McMullen MR, Nagy LE. Alternative complement pathway component Factor D contributes to efficient clearance of tissue debris following acute CCl₄-induced injury. Mol Immunol 2014; 64:9-17. [PMID: 25467802 DOI: 10.1016/j.molimm.2014.10.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 10/22/2014] [Indexed: 12/22/2022]
Abstract
Complement, part of the innate immune system, is involved with immune protection against invading pathogens as well as cell survival and tissue regeneration. It is known that complement activation is required for timely hepatocyte recovery following an acute toxic injury, but which pathway of complement activation is involved in response to hepatocyte injury has not been identified. In these studies we utilize mice deficient in C1qa, C4 and Factor D, lacking the classical, classical/MBL, and alternative pathways of complement activation, respectively, to identify an essential role for Factor D in the ability of the liver to recover from acute toxic injury. Here we demonstrate that following an acute CCl4-induced injury, the involvement of the alternative complement pathway is essential for efficient liver recovery.
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Affiliation(s)
- Gail A Cresci
- Department of Gastroenterology, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Pathobiology, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Daniela Allende
- Department of Pathology Cleveland Clinic, Cleveland, OH 44195, USA
| | - Megan R McMullen
- Department of Pathobiology, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Laura E Nagy
- Department of Gastroenterology, Cleveland Clinic, Cleveland, OH 44195, USA; Department of Pathobiology, Cleveland Clinic, Cleveland, OH 44195, USA.
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9
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Roychowdhury S, Chiang DJ, McMullen MR, Nagy LE. Moderate, chronic ethanol feeding exacerbates carbon-tetrachloride-induced hepatic fibrosis via hepatocyte-specific hypoxia inducible factor 1α. Pharmacol Res Perspect 2014; 2:e00061. [PMID: 25089199 PMCID: PMC4115456 DOI: 10.1002/prp2.61] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The hypoxia-sensing transcriptional factor HIF1α is implicated in a variety of hepato-pathological conditions; however, the contribution of hepatocyte-derived HIF1α during progression of alcoholic liver injury is still controversial. HIF1α induces a variety of genes including those involved in apoptosis via p53 activation. Increased hepatocyte apoptosis is critical for progression of liver inflammation, stellate cell activation, and fibrosis. Using hepatocyte-specific HIF1α-deficient mice (ΔHepHIF1α−/−), here we investigated the contribution of HIF1α to ethanol-induced hepatocyte apoptosis and its role in amplification of fibrosis after carbon tetrachloride (CCl4) exposure. Moderate ethanol feeding (11% of kcal) induced accumulation of hypoxia-sensitive pimonidazole adducts and HIF1α expression in the liver within 4 days of ethanol feeding. Chronic CCl4 treatment increased M30-positive cells, a marker of hepatocyte apoptosis in pair-fed control mice. Concomitant ethanol feeding (11% of kcal) amplified CCl4-induced hepatocyte apoptosis in livers of wild-type mice, associated with elevated p53K386 acetylation, PUMA expression, and Ly6c+ cell infiltration. Subsequent to increased apoptosis, ethanol-enhanced induction of profibrotic markers, including stellate cell activation, collagen 1 expression, and extracellular matrix deposition following CCl4 exposure. Ethanol-induced exacerbation of hepatocyte apoptosis, p53K386 acetylation, and PUMA expression following CCl4 exposure was attenuated in livers of ΔHepHIF1α−/− mice. This protection was also associated with a reduction in Ly6c+ cell infiltration and decreased fibrosis in livers of ΔHepHIF1α−/− mice. In summary, these results indicate that moderate ethanol exposure leads to hypoxia/HIF1α-mediated signaling in hepatocytes and induction of p53-dependent apoptosis of hepatocytes, resulting in increased hepatic fibrosis during chronic CCl4 exposure.
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Affiliation(s)
- Sanjoy Roychowdhury
- Center for Liver Disease Research, Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio
| | - Dian J Chiang
- Department of Gastroenterology, Cleveland Clinic, Cleveland, Ohio
| | - Megan R McMullen
- Center for Liver Disease Research, Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio
| | - Laura E Nagy
- Center for Liver Disease Research, Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio ; Department of Gastroenterology, Cleveland Clinic, Cleveland, Ohio ; Department of Molecular Medicine, Case Western Reserve University, Cleveland, Ohio
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10
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Qu Q, Liu J, Zhou HH, Klaassen CD. Nrf2 protects against furosemide-induced hepatotoxicity. Toxicology 2014; 324:35-42. [PMID: 24813929 DOI: 10.1016/j.tox.2014.02.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2013] [Revised: 01/17/2014] [Accepted: 02/17/2014] [Indexed: 10/25/2022]
Abstract
Furosemide is a diuretic drug, but its reactive intermediates lead to acute liver injury in mice. Given the essential role of Nrf2 as a cellular defense regulator, we investigated whether Nrf2 would protect against furosemide-induced liver injury using the Nrf2 "gene-dose response" mouse model (Nrf2-null with Nrf2 knock-out, wild-type with normal expression of Nrf2, Keap1-KD with enhanced Nrf2 activation and Keap1-HKO mice with maximum Nrf2 activation). Twenty-four hours after furosemide administration (250mg/kg, i.p.), serum ALT activities and histopathological analysis indicated severe hepatotoxicity in Nrf2-null and WT mice, but significantly less in the Nrf2-overexpressing Keap1-KD and Keap1-HKO mice. Furosemide increased the mRNA of genes involved in the acute phase response (hemeoxygenase-1 and metallothionein-1), ER stress (C/Ebp-homologous protein and Growth arrest and DNA-damage-inducible protein), inflammatory cytokine (interleukin 1 beta), chemokines (macrophage inflammatory protein 2 and mouse keratinocyte-derived chemokine), as well as apoptosis (early growth response factor and BCL2-associated X protein) in livers of Nrf2-null and wild-type mice, but these genes increased less in mice with more Nrf2. The two genotypes of over-expressed Nrf2 mice had increased expression of the Nrf2 target genes Gclm, Gclc and Nqo1 prior to furosemide administration, and the expressions of these genes were increased further after furosemide administration. Thus, our findings provide strong evidence that over-expression of Nrf2 in Keap1-KD and Keap1-HKO mice and the increases in mRNA of a number of genes involved in anti-oxidative stress, anti-inflammation, anti-ER stress and anti-apoptosis protect against furosemide-induced hepatotoxicity.
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Affiliation(s)
- Qiang Qu
- Department of Pharmacy, Xiangya Hospital, Central South University, Changsha 410008, Hunan, China; University of Kansas Medical Center, Kansas City, KS 66101, USA; Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Jie Liu
- University of Kansas Medical Center, Kansas City, KS 66101, USA
| | - Hong-Hao Zhou
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha 410008, China
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Abstract
Kupffer cells are a critical component of the mononuclear phagocytic system and are central to both the hepatic and systemic response to pathogens. Kupffer cells are reemerging as critical mediators of both liver injury and repair. Kupffer cells exhibit a tremendous plasticity; depending on the local metabolic and immune environment, then can express a range of polarized phenotypes, from the proinflammatory M1 phenotype to the alternative/M2 phenotype. Multiple M2 phenotypes can be distinguished, each involved in the resolution of inflammation and wound healing. Here, we have provided an update on recent research that has contributed to the developing delineation of the contribution of Kupffer cells to different types of liver injury, with an emphasis on alcoholic and nonalcoholic liver diseases. These recent advances in our understanding of Kupffer cell function and regulation will likely provide new insights into the potential for therapeutic manipulation of Kupffer cells to promote the resolution of inflammation and enhance wound healing in liver disease.
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Affiliation(s)
- Laura J Dixon
- Liver Disease Research Center, Case Western Reserve University, Cleveland, Ohio, USA
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Roychowdhury S, Chiang DJ, Mandal P, McMullen MR, Liu X, Cohen JI, Pollard J, Feldstein AE, Nagy LE. Inhibition of apoptosis protects mice from ethanol-mediated acceleration of early markers of CCl4 -induced fibrosis but not steatosis or inflammation. Alcohol Clin Exp Res 2012; 36:1139-47. [PMID: 22273278 PMCID: PMC3337974 DOI: 10.1111/j.1530-0277.2011.01720.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Accepted: 10/31/2011] [Indexed: 12/19/2022]
Abstract
BACKGROUND Correlative evidence indicates that apoptosis is associated with the progression of alcoholic liver disease. If apoptosis contributes to ethanol (EtOH)-induced steatohepatitis and/or fibrosis, then mice deficient in Bid, a key pro-apoptotic Bcl-2 family member, or mice treated with a pan-caspase inhibitor (VX166) should be resistant to EtOH-induced liver injury. METHODS This hypothesis was tested in mice using a model of chronic, heavy EtOH-induced liver injury, as well as in a model in which moderate EtOH feeding accelerated the appearance of early markers of hepatic fibrosis in response to acute carbon tetrachloride (CCl(4) ) exposure. RESULTS Chronic EtOH feeding to mice increased TUNEL- and cytokeratin-18-positive cells in the liver, as well as the expression of receptor-interacting protein kinase 3 (RIP3), a marker of necroptosis. In this model, Bid-/- mice or wild-type mice treated with VX166 were protected from EtOH-induced apoptosis, but not EtOH-induced RIP3 expression. Bid deficiency or inhibition of caspase activity did not protect mice from EtOH-induced increases in plasma alanine and aspartate amino transferase activity, steatosis, or mRNA expression of some inflammatory cytokines. Moderate EtOH feeding to mice enhanced the response of mice to acute CCl(4) exposure, resulting in increased expression of α-smooth muscle actin and accumulation of extracellular matrix protein. VX166-treatment attenuated EtOH-mediated acceleration of these early indicators of CCl(4) -induced hepatic fibrosis, decreasing the expression of α-smooth muscle actin, and the accumulation of extracellular matrix protein. CONCLUSIONS EtOH-induced apoptosis of hepatocytes was mediated by Bid. Apoptosis played a critical role in the accelerating the appearance of early markers of CCl(4) -induced fibrosis by moderate EtOH but did not contribute to EtOH-induced hepatocyte injury, steatosis, or expression of mRNA for some inflammatory cytokines.
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Affiliation(s)
- Sanjoy Roychowdhury
- Center for Liver Disease Research, Departments of Pathobiology, Case Western Reserve University, Cleveland, Ohio, USA
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13
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Sullivan BP, Cui W, Copple BL, Luyendyk JP. Early growth response factor-1 limits biliary fibrosis in a model of xenobiotic-induced cholestasis in mice. Toxicol Sci 2011; 126:267-74. [PMID: 22094456 DOI: 10.1093/toxsci/kfr311] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Hepatic expression of the transcription factor early growth response-1 (Egr-1) is increased in livers of patients with cholestatic liver disease. Bile acid induction of inflammatory genes in hepatocytes is Egr-1 dependent, and Egr-1 expression is increased in livers of mice after bile duct ligation. Of importance, Egr-1 deficiency reduces liver inflammation and injury in that model. However, it is not known whether Egr-1 promotes inflammation in other models of cholestasis. We tested the hypothesis that Egr-1 contributes to liver inflammation in mice exposed chronically to the bile duct epithelial cell (BDEC) toxicant alpha-naphthylisothiocyanate (ANIT). Egr-1-knockout (Egr-1(-/-)) mice and wild-type mice were fed a diet containing 0.025% ANIT for 2 weeks. Expression of Egr-1 mRNA and protein was significantly increased in livers of mice fed ANIT diet. Egr-1 deficiency did not significantly affect ANIT diet-induced hepatocellular injury, inflammatory gene induction, BDEC hyperplasia, or hepatic neutrophil accumulation. In contrast, the deposition of Type 1 collagen was significantly increased in livers of Egr-1(-/-) mice fed ANIT diet compared with wild-type mice fed ANIT diet. Interestingly, this increase in liver fibrosis occurred in association with elevated expression of the β6 integrin (Itgb6) gene, suggesting the potential for increased local activation of transforming growth factor beta. Taken together, the results indicate that Egr-1 does not contribute to liver injury or inflammation in mice fed a diet containing ANIT. Rather, these studies indicate that Egr-1 deficiency worsens liver fibrosis in conjunction with enhanced expression of the profibrogenic Itgb6 gene.
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Affiliation(s)
- Bradley P Sullivan
- Department of Pharmacology, Toxicology and Therapeutics, University of Kansas Medical Center, Kansas City, Kansas 66160, USA
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Qi H, Xue B. Role of early growth response 1 in liver injury. Shijie Huaren Xiaohua Zazhi 2011; 19:1914-1921. [DOI: 10.11569/wcjd.v19.i18.1914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Liver injury is a sophisticated pathophysiological process caused by many factors. Currently, the role of early growth response 1 (EGR1) in liver injury is still controversial. Some studies show that EGR1 can amplify the systemic inflammatory response and promote apoptosis in galactosamine/lipopolysaccharide-induced acute liver injury and alpha-naphthylisothiocyanate (ANIT)-induced intrahepatic cholestasis as well as other non-liver injuries, while some other studies indicate that EGR1 protects the liver from CCl4 exposure by regulating the expression of inducible nitric oxide synthase, cyclooxygenase-2, and tumor necrosis factor-α-regulated genes that have hepatoprotective function.
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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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Ilic S, Drmic D, Zarkovic K, Kolenc D, Brcic L, Radic B, Djuzel V, Blagaic AB, Romic Z, Dzidic S, Kalogjera L, Seiwerth S, Sikiric P. Ibuprofen hepatic encephalopathy, hepatomegaly, gastric lesion and gastric pentadecapeptide BPC 157 in rats. Eur J Pharmacol 2011; 667:322-9. [PMID: 21645505 DOI: 10.1016/j.ejphar.2011.05.038] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 05/12/2011] [Accepted: 05/22/2011] [Indexed: 02/07/2023]
Abstract
Chronic ibuprofen (0.4 g/kg intraperitoneally, once daily for 4 weeks) evidenced a series of pathologies, not previously reported in ibuprofen-dosed rats, namely hepatic encephalopathy, gastric lesions, hepatomegaly, increased AST and ALT serum values with prolonged sedation/unconsciousness, and weight loss. In particular, ibuprofen toxicity was brain edema, particularly in the cerebellum, with the white matter being more affected than in gray matter. In addition, damaged and red neurons, in the absence of anti-inflammatory reaction was observed, particularly in the cerebral cortex and cerebellar nuclei, but was also present although to a lesser extent in the hippocampus, dentate nucleus and Purkinje cells. An anti-ulcer peptide shown to have no toxicity, the stable gastric pentadecapeptide BPC 157 (GEPPPGKPADDAGLV, MW 1419, 10 μg, 10 ng/kg) inhibited the pathology seen with ibuprofen (i) when given intraperitoneally, immediately after ibuprofen daily or (ii) when given in drinking water (0.16 μg, 0.16 ng/ml). Counteracted were all adverse effects, such as hepatic encephalopathy, the gastric lesions, hepatomegaly, increased liver serum values. In addition, BPC 157 treated rats showed no behavioral disturbances and maintained normal weight gain. Thus, apart from efficacy in inflammatory bowel disease and various wound treatments, BPC 157 was also effective when given after ibuprofen.
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Affiliation(s)
- Spomenko Ilic
- Department of Pharmacology and Pathology Medical Faculty University of Zagreb, Zagreb, Croatia
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Ilic S, Drmic D, Franjic S, Kolenc D, Coric M, Brcic L, Klicek R, Radic B, Sever M, Djuzel V, Filipovic M, Djakovic Z, Stambolija V, Blagaic AB, Zoricic I, Gjurasin M, Stupnisek M, Romic Z, Zarkovic K, Dzidic S, Seiwerth S, Sikiric P. Pentadecapeptide BPC 157 and its effects on a NSAID toxicity model: diclofenac-induced gastrointestinal, liver, and encephalopathy lesions. Life Sci 2011; 88:535-42. [PMID: 21295044 DOI: 10.1016/j.lfs.2011.01.015] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2010] [Revised: 12/23/2010] [Accepted: 01/05/2011] [Indexed: 02/07/2023]
Abstract
AIMS We attempted to fully antagonize the extensive toxicity caused by NSAIDs (using diclofenac as a prototype). MAIN METHODS Herein, we used the stable gastric pentadecapeptide BPC 157 (GEPPPGKPADDAGLV, MW 1419), an anti-ulcer peptide shown to be efficient in inflammatory bowel disease clinical trials (PL 14736) and various wound treatments with no toxicity reported. This peptide was given to antagonize combined gastrointestinal, liver, and brain toxicity induced by diclofenac (12.5mg/kg intraperitoneally, once daily for 3 days) in rats. KEY FINDINGS Already considered a drug that can reverse the toxic side effects of NSAIDs, BPC 157 (10 μg/kg, 10 ng/kg) was strongly effective throughout the entire experiment when given (i) intraperitoneally immediately after diclofenac or (ii) per-orally in drinking water (0.16 μg/mL, 0.16 ng/mL). Without BPC 157 treatment, at 3h following the last diclofenac challenge, we encountered a complex deleterious circuit of diclofenac toxicity characterized by severe gastric, intestinal and liver lesions, increased bilirubin, aspartate transaminase (AST), alanine transaminase (ALT) serum values, increased liver weight, prolonged sedation/unconsciousness (after any diclofenac challenge) and finally hepatic encephalopathy (brain edema particularly located in the cerebral cortex and cerebellum, more in white than in gray matter, damaged red neurons, particularly in the cerebral cortex and cerebellar nuclei, Purkinje cells and less commonly in the hippocampal neurons). SIGNIFICANCE The very extensive antagonization of diclofenac toxicity achieved with BPC 157 (μg-/ng-regimen, intraperitoneally, per-orally) may encourage its further use as a therapy to counteract diclofenac- and other NSAID-induced toxicity.
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Affiliation(s)
- Spomenko Ilic
- Department of Pharmacology and Pathology Medical Faculty, University of Zagreb, Zagreb, Croatia
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Bile acids induce inflammatory genes in hepatocytes: a novel mechanism of inflammation during obstructive cholestasis. THE AMERICAN JOURNAL OF PATHOLOGY 2010; 178:175-86. [PMID: 21224055 DOI: 10.1016/j.ajpath.2010.11.026] [Citation(s) in RCA: 357] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Revised: 08/16/2010] [Accepted: 09/02/2010] [Indexed: 02/06/2023]
Abstract
Inflammation contributes to liver injury during cholestasis. The mechanism by which cholestasis initiates an inflammatory response in the liver, however, is not known. Two hypotheses were investigated in the present studies. First, activation of Toll-like receptor 4 (TLR4), either by bacterial lipopolysaccharide or by damage-associated molecular pattern molecules released from dead hepatocytes, triggers an inflammatory response. Second, bile acids act as inflammagens, and directly activate signaling pathways in hepatocytes that stimulate production of proinflammatory mediators. Liver inflammation was not affected in lipopolysaccharide-resistant C3H/HeJ mice after bile duct ligation, indicating that Toll-like receptor 4 is not required for initiation of inflammation. Treatment of hepatocytes with bile acids did not directly cause cell toxicity but increased the expression of numerous proinflammatory mediators, including cytokines, chemokines, adhesion molecules, and other proteins that influence immune cell levels and function. Up-regulation of several of these genes in hepatocytes and in the liver after bile duct ligation required early growth response factor-1, but not farnesoid X receptor. In addition, early growth response factor-1 was up-regulated in the livers of patients with cholestasis and correlated with levels of inflammatory mediators. These data demonstrate that Toll-like receptor 4 is not required for the initiation of acute inflammation during cholestasis. In contrast, bile acids directly activate a signaling network in hepatocytes that promotes hepatic inflammation during cholestasis.
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Susilowati H, Okamura H, Hirota K, Shono M, Yoshida K, Murakami K, Tabata A, Nagamune H, Haneji T, Miyake Y. Intermedilysin induces EGR-1 expression through calcineurin/NFAT pathway in human cholangiocellular carcinoma cells. Biochem Biophys Res Commun 2010; 404:57-61. [PMID: 21094139 DOI: 10.1016/j.bbrc.2010.11.057] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Accepted: 11/14/2010] [Indexed: 12/31/2022]
Abstract
Intermedilysin (ILY) is a cholesterol-dependent cytolysin produced by Streptococcus intermedius, which is associated with human brain and liver abscesses. Although intrahepatic bile duct cells play a valuable role in the pathogenesis of liver abscess, the molecular mechanism of ILY-treated intrahepatic bile duct cells remains unknown. In this study, we report that ILY induced a nuclear accumulation of intracellular calcium ([Ca(2+)]i) in human cholangiocellular cells HuCCT1. We also demonstrate that 10 ng/ml ILY induced NFAT1 dephosphorylation and its nuclear translocation in HuCCT1 cells. In contrast to the result that ILY induced NF-κB translocation in human hepatic HepG2 cells, ILY did not affect NF-κB localization in HuCCT1 cells. Dephosphorylation and nuclear translocation of NFAT1 caused by ILY were prevented by [Ca(2+)]i calcium chelator, BAPTA/AM, and calcineurin inhibitors, cyclosporine A and tacrolimus. ILY induced early growth response-1 (EGR-1) expression and it was inhibited by the pre-treatment with cyclosporine A, indicating that the calcineurin/NFAT pathway was involved in EGR-1 expression in response to ILY. ILY-induced calcineurin/NFAT1 activation and sequential EGR-1 expression might be related to the pathogenesis of S. intermedius in human bile duct cells.
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Affiliation(s)
- Heni Susilowati
- Department of Oral Microbiology, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima 770-8504, Japan
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20
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Pritchard MT, Cohen JI, Roychowdhury S, Pratt BT, Nagy LE. Early growth response-1 attenuates liver injury and promotes hepatoprotection after carbon tetrachloride exposure in mice. J Hepatol 2010; 53:655-62. [PMID: 20615570 PMCID: PMC2930032 DOI: 10.1016/j.jhep.2010.04.017] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2009] [Revised: 04/23/2010] [Accepted: 04/26/2010] [Indexed: 12/22/2022]
Abstract
BACKGROUND & AIMS Inflammatory gene expression plays a pathological role in acute and chronic hepatic inflammation, yet, inflammation also promotes liver repair by inducing protective mechanisms to limit collateral tissue damage by priming hepatocytes for proliferation. Early growth response (Egr)-1, a transcription factor that regulates inflammatory gene expression, plays a pathological role in many animal models of acute and chronic inflammatory disease. Here, we tested the hypothesis that Egr-1 is beneficial after toxic liver injury. METHODS Acute liver injury was induced in wild-type and egr-1-/- mice by a single injection of carbon tetrachloride (CCl(4)). Liver injury, inflammatory, and hepatoprotective gene expression and signaling events were measured 18, 48, and 72 h after CCl(4) administration. RESULTS Peak liver injury was greater in egr-1-/- mice compared to wild-type mice. Enhanced injury in egr-1-/- mice was associated with reduced tumor necrosis factor (TNF)alpha mRNA and protein expression, reduced Akt phosphorylation and nuclear localization of NFkappaB-p65 in nuclei of cells in the hepatic sinusoid. Expression of inducible nitric oxide synthase and cyclooxygenase-2, TNFalpha-regulated genes that have hepatoprotective function, was attenuated in egr-1-/- mice compared to wild-type mice. Although plasma interleukin (IL)-6 protein and hepatic accumulation of IL-6, glycoprotein 130, and IL-6 receptor alpha mRNA in wild-type and egr-1-/- mice were equivalent, signal transducer and activator of transcription 3 phosphorylation was attenuated in egr-1-/- mice and associated with reduced oncostatin M expression. CONCLUSIONS In contrast to its role in inflammation-mediated tissue injury in other models, Egr-1 expression promotes protection in the liver after CCl(4) exposure.
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Affiliation(s)
- Michele T. Pritchard
- Department of Pathobiology, Cleveland Clinic, Cleveland OH, 44195,Corresponding author: Department of Pathobiology – NE40 Cleveland Clinic 9500 Euclid Avenue Cleveland, OH 44195. Tel.: 216-444-8613; Fax: 216-636-1493, (M.T. Pritchard)
| | - Jessica I. Cohen
- Department of Pathobiology, Cleveland Clinic, Cleveland OH, 44195,Department of Nutrition, Case Western Reserve University, Cleveland OH 44106
| | | | - Brian T. Pratt
- Department of Pathobiology, Cleveland Clinic, Cleveland OH, 44195
| | - Laura E. Nagy
- Department of Pathobiology, Cleveland Clinic, Cleveland OH, 44195,Department of Gastroenterology, Cleveland Clinic, Cleveland OH, 44195,Department of Nutrition, Case Western Reserve University, Cleveland OH 44106
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21
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Cohen JI, Roychowdhury S, McMullen MR, Stavitsky AB, Nagy LE. Complement and alcoholic liver disease: role of C1q in the pathogenesis of ethanol-induced liver injury in mice. Gastroenterology 2010; 139:664-74, 674.e1. [PMID: 20416309 PMCID: PMC3273045 DOI: 10.1053/j.gastro.2010.04.041] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2009] [Revised: 03/08/2010] [Accepted: 04/15/2010] [Indexed: 12/13/2022]
Abstract
BACKGROUND & AIMS Complement is involved in the development of alcoholic liver disease in mice; however, the mechanisms for complement activation during ethanol exposure have not been identified. C1q, the recognition subunit of the first complement component, binds to apoptotic cells, thereby activating the classical complement pathway. Because ethanol exposure increases hepatocellular apoptosis, we hypothesized that ethanol-induced apoptosis would lead to activation of complement via the classical pathway. METHODS Wild-type and C1qa-/- mice were allowed free access to ethanol-containing diets or pair-fed control diets for 4 or 25 days. RESULTS Ethanol feeding for 4 days increased apoptosis of Kupffer cells in both wild-type and C1qa-/- mice. Ethanol-induced deposition of C1q and C3b/iC3b/C3c was colocalized with apoptotic Kupffer cells in wild-type, but not C1qa-/-, mice. Furthermore, ethanol-induced increases in tumor necrosis factor-alpha and interleukin-6 expression at this early time point were suppressed in C1q-deficient mice. Chronic ethanol feeding (25 days) increased steatosis, hepatocyte apoptosis, and activity of serum alanine and aspartate aminotransferases in wild-type mice. These markers of hepatocyte injury were attenuated in C1qa-/- mice. In contrast, chronic ethanol (25 days)-induced increases in cytochrome P450 2E1 expression and oxidative stress did not differ between wild-type and C1qa-/- mice. CONCLUSIONS For the first time, these data indicate that ethanol activates the classical complement pathway via C1q binding to apoptotic cells in the liver and that C1q contributes to the pathogenesis of ethanol-induced liver injury.
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Affiliation(s)
- Jessica I. Cohen
- Department of Nutrition, Case Western Reserve University, Cleveland, Ohio,Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio
| | | | | | - Abram B. Stavitsky
- Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio,Department of Molecular Biology and Microbiology, Case Western Reserve University, Cleveland, Ohio
| | - Laura E. Nagy
- Department of Nutrition, Case Western Reserve University, Cleveland, Ohio,Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio,Department of Gastroenterology, Cleveland Clinic, Cleveland, Ohio
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Pritchard MT, Nagy LE. Hepatic fibrosis is enhanced and accompanied by robust oval cell activation after chronic carbon tetrachloride administration to Egr-1-deficient mice. THE AMERICAN JOURNAL OF PATHOLOGY 2010; 176:2743-52. [PMID: 20395449 DOI: 10.2353/ajpath.2010.091186] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The transcription factor early growth response (Egr)-1 regulates the expression of genes required for execution of the wound healing response. Multiple cycles of injury, coupled to incomplete wound healing, lead to fibrosis. Therefore, we hypothesized that Egr-1 is required for the development of hepatic fibrosis. To test this hypothesis, we exposed wild-type and egr-1(-/-) mice to acute or chronic carbon tetrachloride (CCl(4)). Acute CCl(4) exposure established a profibrotic milieu in the liver, including activation of hepatic stellate cells as well as expression of type 1 collagen genes and tissue inhibitor of matrix metalloproteinase 1 in both wild-type and egr-1(-/-) mice. This response was exacerbated in egr-1(-/-) mice. After chronic CCl(4) exposure, hepatic fibrosis was established in both genotypes; however, the fibrotic response was profoundly worsened in Egr-1-deficient mice. Importantly, enhanced fibrosis in egr-1(-/-) mice was accompanied by a robust activation of the oval cell response, suggesting more severe liver injury and/or reduced hepatocyte proliferation when compared with wild-type mice. Hepatic expression of genes indicative of oval cell activation, as well as the number of cells expressing A6, a mouse oval cell marker, was greater in egr-1(-/-) mice. Taken together, these data reveal novel roles for Egr-1 as a negative regulator of both CCl(4)-induced hepatic fibrosis and the oval cell response.
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Affiliation(s)
- Michele T Pritchard
- Department of Pathobiology-NE40, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, USA.
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Bernardini C, Zannoni A, Bacci ML, Forni M. Protective effect of carbon monoxide pre-conditioning on LPS-induced endothelial cell stress. Cell Stress Chaperones 2010; 15:219-24. [PMID: 19693705 PMCID: PMC2866981 DOI: 10.1007/s12192-009-0136-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2009] [Revised: 07/20/2009] [Accepted: 07/31/2009] [Indexed: 12/29/2022] Open
Abstract
Increasing evidence indicates that carbon monoxide (CO) may protect against several diseases including sepsis. The ability of CO pre-treatment to provide good pre-conditioning against lipopolysaccharide (LPS)-induced injury was tested using an in vitro model of primary culture of porcine aortic endothelial cells (pAEC). pAEC were exposed to CO (250 ppm) or air for 1 h prior to the addition of LPS (10 microg/ml). Hsp70, HO-1, and Egr-1 protein levels were determined as well as vascular endothelial growth factor (VEGF) secretion after 4, 7, and 15 h. The effect of CO on LPS-induced apoptosis was also detected at 15 h. CO pre-treatment before the addition of LPS, significantly reduced LPS-induced apoptosis. LPS induced an increase in the level of VEGF in culture media after 7 and 15 h, and a larger increase was detected in CO pre-treated cells. In addition, CO pre-treatment reduced LPS-induced Hsp70, HO-1, and Egr-1 protein expression. In conclusion, CO treatment seems to provide a good pre-conditioning for the prevention of LPS-induced endothelial injury.
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Affiliation(s)
- Chiara Bernardini
- Department of Veterinary Morphophysiology and Animal Production, DIMORFIPA, University of Bologna, Italy.
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Shinozaki S, Inoue Y, Yang W, Fukaya M, Carter EA, Yu YM, Ming-Yu Y, Fischman A, Tompkins R, Kaneki M. Farnesyltransferase inhibitor improved survival following endotoxin challenge in mice. Biochem Biophys Res Commun 2009; 391:1459-64. [PMID: 20034462 DOI: 10.1016/j.bbrc.2009.12.094] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2009] [Accepted: 12/16/2009] [Indexed: 01/09/2023]
Abstract
Endotoxemia plays an important role in the pathogenesis of sepsis and is accompanied by dysregulated apoptosis of immune and non-immune cells. Treatment with statins reduces mortality in rodent models of sepsis and endotoxemia. Inhibition of protein isoprenylation, including farnesylation, has been proposed as a mechanism to mediate the lipid-lowering-independent effects of statins. Nonetheless, the effects of the inhibition of isoprenylation have not yet been studied. To investigate the role of farnesylation, we evaluated the effects of farnesyltransferase inhibitor and statin on survival following lipopolysaccharide (LPS) challenge in mice. Both simvastatin (2mg/kg BW) and FTI-277 (20mg/kg BW) treatment improved survival by twofold after LPS injection, as compared with vehicle alone (p<0.01). LPS-induced cleavage (activation) of caspase-3, an indicator of apoptotic change, and increased protein expression of proapoptotic molecules, Bax and Bim, and activation of c-Jun NH(2)-terminal kinase (JNK/SAPK) in the liver and spleen were attenuated by both simvastatin and FTI-277. These results demonstrate that farnesyltransferase inhibitor as well as statin significantly reduced LPS-induced mortality in mice. Our findings also suggest that inhibition of protein farnesylation may contribute to the lipid-lowering-independent protective effects of statins in endotoxemia, and that protein farnesylation may play a role in LPS-induced stress response, including JNK/SAPK activation, and apoptotic change. Our data argue that farnesyltransferase may be a potential molecular target for treating patients with endotoxemia.
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Tuñón MJ, Alvarez M, Culebras JM, González-Gallego J. An overview of animal models for investigating the pathogenesis and therapeutic strategies in acute hepatic failure. World J Gastroenterol 2009; 15:3086-98. [PMID: 19575487 PMCID: PMC2705730 DOI: 10.3748/wjg.15.3086] [Citation(s) in RCA: 153] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2009] [Revised: 05/23/2009] [Accepted: 05/30/2009] [Indexed: 02/06/2023] Open
Abstract
Acute hepatic failure (AHF) is a severe liver injury accompanied by hepatic encephalopathy which causes multiorgan failure with an extremely high mortality rate, even if intensive care is provided. Management of severe AHF continues to be one of the most challenging problems in clinical medicine. Liver transplantation has been shown to be the most effective therapy, but the procedure is limited by shortage of donor organs. Although a number of clinical trials testing different liver assist devices are under way, these systems alone have no significant effect on patient survival and are only regarded as a useful approach to bridge patients with AHF to liver transplantation. As a result, reproducible experimental animal models resembling the clinical conditions are still needed. The three main approaches used to create an animal model for AHF are: surgical procedures, toxic liver injury and infective procedures. Most common models are based on surgical techniques (total/partial hepatectomy, complete/transient devascularization) or the use of hepatotoxic drugs (acetaminophen, galactosamine, thioacetamide, and others), and very few satisfactory viral models are available. We have recently developed a viral model of AHF by means of the inoculation of rabbits with the virus of rabbit hemorrhagic disease. This model displays biochemical and histological characteristics, and clinical features that resemble those in human AHF. In the present article an overview is given of the most widely used animal models of AHF, and their main advantages and disadvantages are reviewed.
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Cohen JI, Roychowdhury S, DiBello PM, Jacobsen DW, Nagy LE. Exogenous thioredoxin prevents ethanol-induced oxidative damage and apoptosis in mouse liver. Hepatology 2009; 49:1709-17. [PMID: 19205032 PMCID: PMC2895317 DOI: 10.1002/hep.22837] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
UNLABELLED Ethanol-induced liver injury is characterized by increased formation of reactive oxygen species (ROS) and inflammatory cytokines, resulting in the development of hepatic steatosis, injury, and cell death by necrosis and apoptosis. Thioredoxin (Trx), a potent antioxidant and antiinflammatory molecule with antiapoptotic properties, protects animals from a number of inflammatory diseases. However, the effects of ethanol on Trx or its role in ethanol-induced liver injury are not known. Female C57BL/6 mice were allowed ad libitum access to a Lieber-deCarli ethanol diet with 5.4% of calories as ethanol for 2 days to acclimate them to the diet, followed by 2 days with 32.4% of calories as ethanol or pair-fed control diet. Hepatic Trx-1 was decreased by ethanol feeding; daily supplementation with recombinant human Trx (rhTrx) prevented this ethanol-induced decrease. Therefore, we tested the hypothesis that administration of rhTrx during ethanol exposure would attenuate ethanol-induced oxidative stress, inflammatory cytokine production, and apoptosis. Mice were treated with a daily intraperitoneal injection of either 5 g/kg of rhTrx or phosphate-buffered saline (PBS). CONCLUSION Ethanol feeding increased accumulation of hepatic 4-hydroxynonenal protein adducts, expression of hepatic tumor necrosis factor alpha, and resulted in hepatic steatosis and increased plasma aspartate aminotransferase and alanine aminotransferase. In ethanol-fed mice, treatment with rhTrx reduced 4-hydroxynonenal adduct accumulation, inflammatory cytokine expression, decreased hepatic triglyceride, and improved liver enzyme profiles. Ethanol feeding also increased transferase-mediated dUTP-biotin nick-end labeling-positive cells, caspase-3 activity, and cytokeratin-18 staining in the liver. rhTrx treatment prevented these increases. In summary, rhTrx attenuated ethanol-induced increases in markers of oxidative stress, inflammatory cytokine expression, and apoptosis.
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Affiliation(s)
- Jessica I. Cohen
- Department of Nutrition, Case Western Reserve University, Cleveland, Ohio,Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio
| | | | | | | | - Laura E. Nagy
- Department of Nutrition, Case Western Reserve University, Cleveland, Ohio,Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio,Department of Gastroenterology, Cleveland Clinic, Cleveland, Ohio
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Zeng S, Dun H, Ippagunta N, Rosario R, Zhang QY, Lefkowitch J, Yan SF, Schmidt AM, Emond JC. Receptor for advanced glycation end product (RAGE)-dependent modulation of early growth response-1 in hepatic ischemia/reperfusion injury. J Hepatol 2009; 50:929-36. [PMID: 19303658 DOI: 10.1016/j.jhep.2008.11.022] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2008] [Accepted: 11/19/2008] [Indexed: 01/11/2023]
Abstract
BACKGROUND/AIMS We previously showed that blockade of RAGE significantly attenuates hepatic ischemia/reperfusion (I/R) injury in mice. Here, we identify that early growth response-1 (Egr-1) is a downstream target of RAGE in hepatic I/R injury. METHODS Hepatic I/R was induced in male mice. Liver remnants were analyzed for induction of Egr-1 and cytokines, as well as regulation of apoptotic pathways after reperfusion. RESULTS Egr-1 was upregulated in the liver remnants after hepatic I/R injury and was suppressed by administration of soluble RAGE or deletion of the RAGE gene. RAGE-mediated increased expression of Egr-1 upregulates a central downstream gene, MIP2. In contrast, RAGE-stimulated Egr-1-independent pathways regulate TNF-alpha production and apoptosis in response to I/R. Consistent with these findings, phospho-p44/42 and phospho-JNK MAPK and c-Jun were strikingly suppressed in RAGE(-/-) versus WT mice, but not in Egr-1(-/-) mice. RAGE ligand HMGB1 was upregulated after I/R in the liver remnants. In vitro, incubation of RAGE-expressing liver dendritic cells (DCs) with recombinant HMGB-1 resulted in increased Egr-1 transcripts, in a manner suppressed by RAGE gene deletion, soluble RAGE and inhibitors of p44/p42 or JNK MAP kinase. CONCLUSIONS Suppression of Egr-1 may contribute to the protective mechanisms underlying the beneficial impact of RAGE blockade or deletion.
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Affiliation(s)
- Shan Zeng
- Division of Liver Diseases and Transplantation, Department of Surgery, College of Physicians & Surgeons, Columbia University, 630 West 168th Street, New York, NY 10032, USA.
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TrehanPati N, Geffers R, Sukriti, Hissar S, Riese P, Toepfer T, Buer J, Kumar M, Guzman CA, Sarin SK. Gene expression signatures of peripheral CD4+ T cells clearly discriminate between patients with acute and chronic hepatitis B infection. Hepatology 2009; 49:781-90. [PMID: 19185001 DOI: 10.1002/hep.22696] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
UNLABELLED CD4+ T and regulatory T cells (Tregs) seem to play a key role in persistence of hepatitis B virus (HBV) infection. However, the molecular events by which Tregs exert their modulatory activity are largely unknown. The transcriptional profiles of CD4+ T cells of healthy controls (HCs) and patients affected by acute hepatitis B (AVH-B) or chronic hepatitis B (CHB) infection were established using a custom expression array consisting of 350 genes relevant for CD4+ T cell and Treg function. These studies were complemented by real-time reverse-transcription polymerase chain reaction. Peripheral blood mononuclear cells (PBMCs) were also analyzed for the presence of Tregs, which were more abundant in the acute stage of the disease (7%) than in HCs and CHB infection (HCs versus AVH-B, P = 0.003; AVH-B versus CHB, P = 0.04). One hundred eighteen genes (34%) intrinsically differentiate HBV-infected patients from HCs. Using gene ontology, we identified T cell receptor signaling and clusterization, mitogen-activated protein kinase kinase signaling, cell adhesion, cytokines and inflammatory responses, cell cycle/cell proliferation, and apoptosis as the most prominent affected modules. A higher expression of CCR1, CCR3, CCR4, CCR5, and CCR8 was seen in AVH-B than in CHB-infected patients and HCs. Annotation of the interconnected functional network of genes provided a unique representation of global immune activation during acute infection. Almost all genes were down-regulated in patients with CHB infection. CONCLUSION The fingerprints enable clear discrimination between patients suffering from AVH-B or CHB infection. The observed profiles suggest accumulation of effector T cells with a potential role in necro-inflammation during the acute stage. Subsequent down-regulated effector functions support the hypothesis of suppressed CD4+ effector T cells favoring viral persistence in the chronic infection stage.
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