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Guevara C, Vicencio SC, Pizarro IS, Villavicencio-Tejo F, Quintanilla RA, Astudillo P, Ampuero E, Varas R, Orellana JA, Ortiz FC. Evidence for TGF-β1/Nrf2 Signaling Crosstalk in a Cuprizone Model of Multiple Sclerosis. Antioxidants (Basel) 2024; 13:914. [PMID: 39199160 PMCID: PMC11351764 DOI: 10.3390/antiox13080914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2024] [Accepted: 07/25/2024] [Indexed: 09/01/2024] Open
Abstract
Multiple sclerosis (MS) is a chronic and degenerative disease that impacts central nervous system (CNS) function. One of the major characteristics of the disease is the presence of regions lacking myelin and an oxidative and inflammatory environment. TGF-β1 and Nrf2 proteins play a fundamental role in different oxidative/inflammatory processes linked to neurodegenerative diseases such as MS. The evidence from different experimental settings has demonstrated a TGF-β1-Nrf2 signaling crosstalk under pathological conditions. However, this possibility has not been explored in experimental models of MS. Here, by using the cuprizone-induced demyelination model of MS, we report that the in vivo pharmacological blockage of the TGF-β1 receptor reduced Nrf2, catalase, and TGFβ-1 protein levels in the demyelination phase of cuprizone administration. In addition, ATP production, locomotor function and cognitive performance were diminished by the treatment. Altogether, our results provide evidence for a crosstalk between TGF-β1 and Nrf2 signaling pathways under CNS demyelination, highlighting the importance of the antioxidant cellular response of neurodegenerative diseases such as MS.
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Affiliation(s)
- Coram Guevara
- Mechanisms of Myelin Formation and Repair Laboratory, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile
| | - Sinay C. Vicencio
- Mechanisms of Myelin Formation and Repair Laboratory, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile
| | - Ignacio S. Pizarro
- Mechanisms of Myelin Formation and Repair Laboratory, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile
| | - Francisca Villavicencio-Tejo
- Laboratory of Neurodegenerative Diseases, Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Santiago 8910060, Chile (R.A.Q.)
| | - Rodrigo A. Quintanilla
- Laboratory of Neurodegenerative Diseases, Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Santiago 8910060, Chile (R.A.Q.)
| | - Pablo Astudillo
- Instituto de Ciencias Biomédicas, Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Santiago 8910060, Chile
| | - Estibaliz Ampuero
- Laboratorio Neurofarmacología del Comportamiento, Facultad de Química y Biología, Universidad de Santiago, Santiago9170022, Chile
| | - Rodrigo Varas
- Facultad de Ciencias de la Salud, Universidad Autónoma de Chile, Santiago 8910060, Chile
| | - Juan A. Orellana
- Departamento de Neurología, Escuela de Medicina, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago 8330024, Chile
- Centro Interdisciplinario de Neurociencias, Pontificia Universidad Católica de Chile, Santiago 8330024, Chile
| | - Fernando C. Ortiz
- Mechanisms of Myelin Formation and Repair Laboratory, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago 9170022, Chile
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Sueblinvong V, Fan X, Hart C, Molina S, Koval M, Guidot DM. Ethanol-exposed lung fibroblasts cause airway epithelial barrier dysfunction. ALCOHOL, CLINICAL & EXPERIMENTAL RESEARCH 2023; 47:1839-1849. [PMID: 37864530 DOI: 10.1111/acer.15174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 07/24/2023] [Accepted: 08/11/2023] [Indexed: 10/23/2023]
Abstract
BACKGROUND Chronic alcohol ingestion predisposes to lung injury and disrepair during sepsis. Our previous studies outlined roles for transforming growth factor-beta 1 (TGFβ1) and granulocyte-macrophage colony-stimulating factor (GM-CSF) in epithelial barrier homeostasis and how alcohol perturbs their expression and signaling. Here we hypothesize that ethanol-exposed lung fibroblasts (LF) are a source of dysregulated TGFβ1 and GM-CSF and thereby alter airway epithelial barrier function. METHODS Human or rat LF were cultured ± ethanol for 2 weeks and then co-cultured with human or rat airway epithelial cells (AEC) seeded on Transwell permeable supports. In selected groups, a TGFβ1 receptor type 1 (TGFβR1) inhibitor (SB431542) or a TGFβ1 neutralizing antibody was applied. Transepithelial electrical resistance (TER) was measured prior to co-culture and on day 5 of co-culture. AEC were then analyzed for the expression of selected tight junction and mesenchymal proteins, and transwell membranes were analyzed by immunofluorescence microscopy for ZO-1 expression and localization. TGFβ1 and GM-CSF levels in conditioned media from the co-cultures were quantified by ELISA. RESULTS AEC co-cultured with ethanol-exposed LF (ELF) showed a significant reduction in TER and corresponding decreases in ZO-1 expression, whereas collagen type 1A1 and α-smooth muscle actin protein expression were increased. In parallel, in conditioned media from the ELF + AEC co-cultures, activated TGFβ1 levels increased and GM-CSF levels decreased. Notably, all the effects of ELF on the AEC were prevented by blocking TGFβ1 activity. CONCLUSIONS Prior ethanol exposure to LF induces barrier dysfunction in naive AEC in a paracrine fashion through activation of TGFβ1 signaling and suppression of GM-CSF. These experimental findings provide a potential mechanism by which chronic alcohol ingestion impairs airway epithelial integrity and renders individuals susceptible to lung injury.
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Affiliation(s)
- Viranuj Sueblinvong
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Xian Fan
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Craishun Hart
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Samuel Molina
- FUJIFILM Irvine Scientific, Warminster, Pennsylvania, USA
| | - Michael Koval
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - David M Guidot
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
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Elumalai P, Ezhilarasan D, Raghunandhakumar S. Letter to Editor on: "Ginger ( Zingiber officinale roscoe) extract could upregulate the renal expression of NRF2 and TNFα and prevents ethanol-induced toxicity in rat kidney" by Akbari et al. AVICENNA JOURNAL OF PHYTOMEDICINE 2023; 13:1-2. [PMID: 36698736 PMCID: PMC9840779 DOI: 10.22038/ajp.2022.21187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 12/08/2021] [Indexed: 01/27/2023]
Affiliation(s)
| | - Devaraj Ezhilarasan
- Department of Pharmacology, The Gold lab, Molecular Medicine and Toxicology Division, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, Tamil Nadu, India
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Crotty KM, Yeligar SM. Hyaladherins May be Implicated in Alcohol-Induced Susceptibility to Bacterial Pneumonia. Front Immunol 2022; 13:865522. [PMID: 35634317 PMCID: PMC9133445 DOI: 10.3389/fimmu.2022.865522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 04/15/2022] [Indexed: 11/13/2022] Open
Abstract
Although the epidemiology of bacterial pneumonia and excessive alcohol use is well established, the mechanisms by which alcohol induces risk of pneumonia are less clear. Patterns of alcohol misuse, termed alcohol use disorders (AUD), affect about 15 million people in the United States. Compared to otherwise healthy individuals, AUD increase the risk of respiratory infections and acute respiratory distress syndrome (ARDS) by 2-4-fold. Levels and fragmentation of hyaluronic acid (HA), an extracellular glycosaminoglycan of variable molecular weight, are increased in chronic respiratory diseases, including ARDS. HA is largely involved in immune-assisted wound repair and cell migration. Levels of fragmented, low molecular weight HA are increased during inflammation and decrease concomitant with leukocyte levels following injury. In chronic respiratory diseases, levels of fragmented HA and leukocytes remain elevated, inflammation persists, and respiratory infections are not cleared efficiently, suggesting a possible pathological mechanism for prolonged bacterial pneumonia. However, the role of HA in alcohol-induced immune dysfunction is largely unknown. This mini literature review provides insights into understanding the role of HA signaling in host immune defense following excessive alcohol use. Potential therapeutic strategies to mitigate alcohol-induced immune suppression in bacterial pneumonia and HA dysregulation are also discussed.
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Affiliation(s)
- Kathryn M Crotty
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Emory University, Atlanta, GA, United States.,Atlanta Veterans Affairs Health Care System, Decatur, GA, United States
| | - Samantha M Yeligar
- Department of Medicine, Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Emory University, Atlanta, GA, United States.,Atlanta Veterans Affairs Health Care System, Decatur, GA, United States
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5
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Li X, Wong SS, Tan C, Espinoza CR, Hagood JS. Loss of Thy-1 may reduce lung regeneration after pneumonectomy in mice. Minerva Med 2020; 112:622-630. [PMID: 32696636 DOI: 10.23736/s0026-4806.20.06691-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Lung regeneration plays an important role in lung repair after injury. It is reliant upon proliferation of multiple cell types in the lung, including endothelium, epithelium, and fibroblasts, as well as remodeling of the extracellular matrix. METHODS Lung regeneration following injury progresses via an initial infammatory response during which macrophages clear the tissue of cellular debris. This process continues through cellular proliferation when existing cells and progenitors act to repopulate cells lost during injury, followed by tissue maturation in which newly formed cells achieve a diferentiated phenotype. RESULTS Signaling pathways critical for lung regeneration include FGF, EGF, WNT, and NOTCH. In addition, HDACs, miRNAs, ELASTIN, and MMP14 have been shown to regulate lung regeneration. Partial pneumonectomy (PNX) has been used as a therapeutic and investigational tool for several decades. Following PNX the remaining lung increases in size to compensate for loss of volume and respiratory capacity. CONCLUSIONS Much has been learned about the triggers and mechanisms regulating pulmonary regeneration. However, the role of thymocyte differentiation antigen-1(thy-1) in post-PNX lung growth remains incompletely characterized. Thy-1 is a phosphatidylinositol glycoprotein with a relative molecular weight of 25000~37000 Da, which is expressed in almost all types of fibroblasts and regulates many biological functions. It not only supports the structure of fibroblasts, but also can balance cell proliferation, migration and regulate the synthesis of immune inflammatory mediators.
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Affiliation(s)
- Xiaoping Li
- Department of Thoracic Surgery, Tianjin First Central Hospital, Tianjin, China.,Department of Paediatrics, University of California San Diego, CA, USA
| | - Simon S Wong
- Department of Paediatrics, University of California San Diego, CA, USA
| | - Chunting Tan
- Department of Paediatrics, University of California San Diego, CA, USA
| | - Celia R Espinoza
- Department of Paediatrics, University of California San Diego, CA, USA
| | - James S Hagood
- Department of Pediatric Pulmonology, University of North Carolina, Chapel Hill, NC, USA -
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Kaphalia L, Srinivasan MP, Kakumanu RD, Kaphalia BS, Calhoun WJ. Ethanol Exposure Impairs AMPK Signaling and Phagocytosis in Human Alveolar Macrophages: Role of Ethanol Metabolism. Alcohol Clin Exp Res 2019; 43:1682-1694. [PMID: 31211863 DOI: 10.1111/acer.14131] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 06/10/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND Chronic alcohol consumption impairs alveolar macrophage's (AM) function and increases risk for developing lung infection and pneumonia. However, the mechanism and metabolic basis of alcohol-induced AM dysfunction leading to lung infection are not well defined, but may include altered ethanol (EtOH) and reactive oxygen species metabolism and cellular energetics. Therefore, oxidative stress, endoplasmic reticulum (ER) stress, the formation of fatty acid ethyl esters [FAEEs, nonoxidative metabolites of EtOH], AMP-activated protein kinase (AMPK) signaling, and phagocytic function were examined in freshly isolated AM incubated with EtOH. METHODS AMs separated from bronchoalveolar lavage fluid samples obtained from normal volunteers were incubated with EtOH for 24 hours. AMPK signaling and ER stress were assessed using Western blotting, FAEEs by GC-MS, oxidative stress by immunofluorescence using antibodies to 4-hydroxynonenal, and phagocytosis by latex beads. Oxidative stress was also measured in EtOH-treated AMs with/without AMPK activator [5-aminoimidazole-4-carboxamide ribonucleotide (AICAR)] or inhibitor (Compound C), and in AMs incubated with FAEEs. mRNA expression for interleukins (IL-6 and IL-8), monocyte chemoattractant protein (MCP)-1, and transforming growth factor (TGF)-β was measured in AM treated with EtOH or FAEEs using RT-PCR. RESULTS EtOH exposure to AM increased oxidative stress, ER stress, and synthesis of FAEEs, decreased phosphorylated AMPK, and impaired phagocytosis. Attenuation or exacerbation of EtOH-induced oxidative stress by AICAR or Compound C, respectively, suggests a link between AMPK signaling, EtOH metabolism, and related oxidative stress. The formation of FAEEs may contribute to EtOH-induced oxidative stress as FAEEs also produced concentration-dependent oxidative stress. An increased mRNA expression of IL-6, IL-8, and MCP-1 by FAEEs is key finding to suggest a metabolic basis of EtOH-induced inflammatory response. CONCLUSIONS EtOH-induced impaired phagocytosis, oxidative stress, ER stress, and dysregulated AMPK signaling are plausibly associated with the formation of FAEEs and may participate in the pathogenesis of nonspecific pulmonary inflammation.
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Affiliation(s)
- Lata Kaphalia
- Division of Pulmonary, Critical Care Medicine, and Sleep, Department of Internal Medicine, University of Texas Medical Branch, Galveston, Texas.,Division of Allergy & Clinical Immunology, Department of Internal Medicine, University of Texas Medical Branch, Galveston, Texas
| | - Mukund P Srinivasan
- Department of Pathology, University of Texas Medical Branch, Galveston, Texas
| | - Ramu D Kakumanu
- Department of Pathology, University of Texas Medical Branch, Galveston, Texas
| | | | - William J Calhoun
- Division of Pulmonary, Critical Care Medicine, and Sleep, Department of Internal Medicine, University of Texas Medical Branch, Galveston, Texas.,Division of Allergy & Clinical Immunology, Department of Internal Medicine, University of Texas Medical Branch, Galveston, Texas
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Neveu WA, Staitieh BS, Mills ST, Guidot DM, Sueblinvong V. Alcohol-Induced Interleukin-17 Expression Causes Murine Lung Fibroblast-to-Myofibroblast Transdifferentiation via Thy-1 Down-Regulation. Alcohol Clin Exp Res 2019; 43:1427-1438. [PMID: 31081931 DOI: 10.1111/acer.14110] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 05/06/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND Alcohol exposure induces TGFβ1 and renders the lung susceptible to injury and disrepair. We determined that TGFβ1 regulates myofibroblast differentiation through the loss of Thy-1 expression and consequent induction of α-SMA. TGFβ1 is important for T helper 17 (Th17) differentiation and IL-17 secretion, which in turn participates in tissue repair. We hypothesized that alcohol induces Th17 differentiation via TGFβ1 and that IL-17 produced by these cells contributes to the development of profibrotic lung myofibroblasts. METHODS Primary lung fibroblasts (PLFs) were treated with alcohol, TGFβ1, and IL-17 and then analyzed for Thy-1 expression and cell morphology. Naïve and Th17-polarized CD4+ T cells were exposed to alcohol and assessed for IL-17 expression. CD4+ T cells from alcohol-fed mice were analyzed for Th17 and IL-17 expression. Lungs of control-fed, bleomycin-treated and alcohol-fed, bleomycin-treated mice were analyzed for IL-17 protein expression. RESULTS Alcohol-treated PLFs expressed lower levels of Thy-1 than untreated cells. TGFβ1 or IL-17 exposure suppressed PLF Thy-1 expression. When administered together, TGFβ1 and IL-17 additively down-regulated Thy-1 expression. Exposure of naïve and Th17-polarized CD4+ T cells to alcohol induced the Th17 phenotype and augmented their production of IL-17. CD4+ Th17+ levels are elevated in the peripheral compartment but not in the lungs of alcohol-fed animals. Treatment of the PLFs with IL-17 and alcohol induced α-SMA expression. Induction of α-SMA and myofibroblast morphology by IL-17 occurred selectively in a Thy-1- fibroblast subpopulation. Chronic alcohol ingestion augmented lung-specific IL-17 expression following bleomycin-induced lung injury. CONCLUSIONS Alcohol exposure skews T cells toward a Th17 immune response that in turn primes the lung for fibroproliferative disrepair through loss of Thy-1 expression and induction of myofibroblast differentiation. These effects suggest that IL-17 and TGFβ1 contribute to fibroproliferative disrepair in the lung and targeting these proteins could limit morbidity and mortality following lung injury in alcoholic individuals.
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Affiliation(s)
- Wendy A Neveu
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Bashar S Staitieh
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - Stephen T Mills
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - David M Guidot
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia.,Atlanta VAMC, Decatur, Georgia
| | - Viranuj Sueblinvong
- Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
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Goh KY, He L, Song J, Jinno M, Rogers AJ, Sethu P, Halade GV, Rajasekaran NS, Liu X, Prabhu SD, Darley-Usmar V, Wende AR, Zhou L. Mitoquinone ameliorates pressure overload-induced cardiac fibrosis and left ventricular dysfunction in mice. Redox Biol 2019; 21:101100. [PMID: 30641298 PMCID: PMC6330374 DOI: 10.1016/j.redox.2019.101100] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2018] [Revised: 01/03/2019] [Accepted: 01/06/2019] [Indexed: 02/07/2023] Open
Abstract
Increasing evidence indicates that mitochondrial-associated redox signaling contributes to the pathophysiology of heart failure (HF). The mitochondrial-targeted antioxidant, mitoquinone (MitoQ), is capable of modifying mitochondrial signaling and has shown beneficial effects on HF-dependent mitochondrial dysfunction. However, the potential therapeutic impact of MitoQ-based mitochondrial therapies for HF in response to pressure overload is reliant upon demonstration of improved cardiac contractile function and suppression of deleterious cardiac remodeling. Using a new (patho)physiologically relevant model of pressure overload-induced HF we tested the hypothesis that MitoQ is capable of ameliorating cardiac contractile dysfunction and suppressing fibrosis. To test this C57BL/6J mice were subjected to left ventricular (LV) pressure overload by ascending aortic constriction (AAC) followed by MitoQ treatment (2 µmol) for 7 consecutive days. Doppler echocardiography showed that AAC caused severe LV dysfunction and hypertrophic remodeling. MitoQ attenuated pressure overload-induced apoptosis, hypertrophic remodeling, fibrosis and LV dysfunction. Profibrogenic transforming growth factor-β1 (TGF-β1) and NADPH oxidase 4 (NOX4, a major modulator of fibrosis related redox signaling) expression increased markedly after AAC. MitoQ blunted TGF-β1 and NOX4 upregulation and the downstream ACC-dependent fibrotic gene expressions. In addition, MitoQ prevented Nrf2 downregulation and activation of TGF-β1-mediated profibrogenic signaling in cardiac fibroblasts (CF). Finally, MitoQ ameliorated the dysregulation of cardiac remodeling-associated long noncoding RNAs (lncRNAs) in AAC myocardium, phenylephrine-treated cardiomyocytes, and TGF-β1-treated CF. The present study demonstrates for the first time that MitoQ improves cardiac hypertrophic remodeling, fibrosis, LV dysfunction and dysregulation of lncRNAs in pressure overload hearts, by inhibiting the interplay between TGF-β1 and mitochondrial associated redox signaling.
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Affiliation(s)
- Kah Yong Goh
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Li He
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Jiajia Song
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Miki Jinno
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Aaron J Rogers
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Palaniappan Sethu
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Ganesh V Halade
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | | | - Xiaoguang Liu
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Sumanth D Prabhu
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Victor Darley-Usmar
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Adam R Wende
- Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Lufang Zhou
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
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Fini MA, Gaydos J, McNally A, Karoor V, Burnham EL. Alcohol abuse is associated with enhanced pulmonary and systemic xanthine oxidoreductase activity. Am J Physiol Lung Cell Mol Physiol 2017; 313:L1047-L1057. [PMID: 28839105 PMCID: PMC5814699 DOI: 10.1152/ajplung.00570.2016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 08/17/2017] [Accepted: 08/17/2017] [Indexed: 01/05/2023] Open
Abstract
Acute respiratory distress syndrome (ARDS) is a common and devastating disorder. Alcohol use disorders (AUDs) increase ARDS risk and worsen outcomes through mechanisms that may include enhancement of pulmonary oxidative stress. Alcohol consumption increases activity of the enzyme xanthine oxidoreductase (XOR) that contributes to production of both reactive oxygen species (ROS) and uric acid, a damage-associated molecular pattern. These by-products have the potential to modulate proinflammatory pathways, such as those involving cyclooxygenase (COX)-2, and to activate the nucleotide-binding domain, leucine-rich-containing family, pyrin-domain containing-3 (NLRP3) inflammasome. We sought to determine if pulmonary and systemic XOR activity was altered by AUDs. Bronchoscopy with bronchoalveolar lavage (BAL) and blood sampling was performed in otherwise healthy human subjects with AUDs and controls. Uric acid in epithelial-lining fluid, derived from BAL, was substantially higher among individuals with AUDs and did not normalize after 7 days of abstinence; serum uric acid did not differ across groups. XOR enzyme activity in fresh BAL cells and serum was significantly increased in subjects with AUDs. XOR protein in BAL cells from AUD subjects was increased in parallel with COX-2 expression, and furthermore, mRNA expression of NLRP3 inflammasome components was sustained in LPS-stimulated BAL cells from AUD subjects in conjunction with increased IL-1β. Our data suggest that AUDs augment pulmonary and systemic XOR activity that may contribute to ROS and uric acid generation, promoting inflammation. Further investigations will be necessary to determine if XOR inhibition can mitigate alcohol-associated pulmonary oxidative stress, diminish inflammation, and improve ARDS outcomes.
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Affiliation(s)
- Mehdi A Fini
- Cardiovascular Pulmonary Research Laboratory, University of Colorado School of Medicine, Denver, Colorado; and
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado School of Medicine, Denver, Colorado
| | - Jeanette Gaydos
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado School of Medicine, Denver, Colorado
| | - Alicia McNally
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado School of Medicine, Denver, Colorado
| | - Vijaya Karoor
- Cardiovascular Pulmonary Research Laboratory, University of Colorado School of Medicine, Denver, Colorado; and
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado School of Medicine, Denver, Colorado
| | - Ellen L Burnham
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado School of Medicine, Denver, Colorado
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Marts LT, Green DE, Mills ST, Murphy T, Sueblinvong V. MiR-21-Mediated Suppression of Smad7 Induces TGFβ1 and Can Be Inhibited by Activation of Nrf2 in Alcohol-Treated Lung Fibroblasts. Alcohol Clin Exp Res 2017; 41:1875-1885. [PMID: 28888052 DOI: 10.1111/acer.13496] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 08/29/2017] [Indexed: 01/02/2023]
Abstract
BACKGROUND We previously demonstrated that chronic alcohol ingestion augments TGFβ1 expression in the lung fibroblast and increases the risk of fibroproliferative disrepair in a mouse model of acute lung injury. The effect of alcohol on TGFβ1 is mitigated by treatment with sulforaphane (SFP), which can activate nuclear factor (erythroid-derived 2)-like 2 (Nrf2). However, the mechanisms by which alcohol amplifies, or SFP attenuates, TGFβ1 expression in the fibroblast are not known. MicroRNA (miR)-21 has been shown to inhibit Smad7, a TGFβ1 signaling inhibitor. In this study, we hypothesized that alcohol augments TGFβ1 expression through up-regulation of miR-21, which subsequently inhibits Smad7. METHODS Primary mouse lung fibroblasts were cultured ± alcohol ± SFP and assessed for gene expression of miR-21, and gene and/or protein expression of Nrf2, Nrf2-regulated antioxidant enzymes, Smad7, STAT3, and TGFβ1. NIH 3T3 fibroblasts were transfected with a miR-21 inhibitor and cultured ± alcohol. α-SMA, Smad7, and TGFβ1 protein expression were then assessed. In parallel, NIH 3T3 lung fibroblasts were transfected with Nrf2 silencing RNA (siRNA) and cultured ± alcohol ± SFP. Gene expression of miR-21, Nrf2, Smad7, and TGFβ1 was assessed. RESULTS MiR-21 gene expression was increased by 12-fold at 48 hours, and Smad7 gene expression and protein expression were reduced by ~30% in alcohol-treated fibroblasts. In parallel, inhibition of miR-21 attenuated alcohol-mediated decrease in Smad7 and increase in TGFβ1 and α-SMA protein expression. Treatment with SFP mitigated the effect of alcohol on miR-21, Smad7 and total and phosphorylated STAT3, and restored Nrf2-regulated antioxidant gene expression. Silencing of Nrf2 prevented the effect of SFP on miR-21, Smad7, and TGFβ1 gene expression in alcohol-treated NIH 3T3 fibroblasts. CONCLUSIONS Alcohol treatment increases TGFβ1 in fibroblasts, at least in part, through augmentation of miR-21, which then inhibits Smad7 expression. These effects can be attenuated by activation of Nrf2 with SFP.
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Affiliation(s)
- Lucian T Marts
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | - David E Green
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia.,Atlanta VAMC, Decatur, Georgia
| | - Stephen T Mills
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
| | | | - Viranuj Sueblinvong
- Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia
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11
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Yeligar SM, Ward JM, Harris FL, Brown LAS, Guidot DM, Cribbs SK. Dysregulation of Alveolar Macrophage PPARγ, NADPH Oxidases, and TGFβ 1 in Otherwise Healthy HIV-Infected Individuals. AIDS Res Hum Retroviruses 2017; 33:1018-1026. [PMID: 28314381 DOI: 10.1089/aid.2016.0030] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Despite antiretroviral therapy (ART), respiratory infections increase mortality in individuals living with chronic human immunodeficiency virus (HIV) infection. In experimental and clinical studies of chronic HIV infection, alveolar macrophages (AMs) exhibit impaired phagocytosis and bacterial clearance. Peroxisome proliferator-activated receptor (PPAR)γ, NADPH oxidase (Nox) isoforms Nox1, Nox2, Nox4, and transforming growth factor-beta 1 (TGFβ1) are critical mediators of AM oxidative stress and phagocytic dysfunction. Therefore, we hypothesized that HIV alters AM expression of these targets, resulting in chronic lung oxidative stress and subsequent immune dysfunction. A cross-sectional study of HIV-infected (n = 22) and HIV-uninfected (n = 6) subjects was conducted. Bronchoalveolar lavage (BAL) was performed, and AMs were isolated. Lung H2O2 generation was determined by measuring H2O2 in the BAL fluid. In AMs, PPARγ, Nox1, Nox2, Nox4, and TGFβ1 mRNA (quantitative real-time polymerase chain reaction) and protein (fluorescent immunomicroscopy) levels were assessed. Compared with HIV-uninfected (control) subjects, HIV-infected subjects were relatively older and the majority were African American; ∼86% were on ART, and their median CD4 count was 445, with a median viral load of 0 log copies/ml. HIV infection was associated with increased H2O2 in the BAL, decreased AM mRNA and protein levels of PPARγ, and increased AM mRNA and protein levels of Nox1, Nox2, Nox4, and TGFβ1. PPARγ attenuation and increases in Nox1, Nox2, Nox4, and TGFβ1 contribute to AM oxidative stress and immune dysfunction in the AMs of otherwise healthy HIV-infected subjects. These findings provide novel insights into the molecular mechanisms by which HIV increases susceptibility to pulmonary infections.
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Affiliation(s)
- Samantha M. Yeligar
- Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Department of Medicine, Emory University, Atlanta, Georgia
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Emory + Children's Healthcare of Atlanta Center for Developmental Lung Biology, Emory University, Atlanta, Georgia
| | - Janine M. Ward
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Emory + Children's Healthcare of Atlanta Center for Developmental Lung Biology, Emory University, Atlanta, Georgia
| | - Frank L. Harris
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Emory + Children's Healthcare of Atlanta Center for Developmental Lung Biology, Emory University, Atlanta, Georgia
| | - Lou Ann S. Brown
- Division of Neonatal-Perinatal Medicine, Department of Pediatrics, Emory + Children's Healthcare of Atlanta Center for Developmental Lung Biology, Emory University, Atlanta, Georgia
| | - David M. Guidot
- Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Department of Medicine, Emory University, Atlanta, Georgia
- Atlanta VA Medical Center, Decatur, Georgia
| | - Sushma K. Cribbs
- Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Department of Medicine, Emory University, Atlanta, Georgia
- Atlanta VA Medical Center, Decatur, Georgia
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12
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Zhang J, Zhou X, Wu W, Wang J, Xie H, Wu Z. Regeneration of glutathione by α-lipoic acid via Nrf2/ARE signaling pathway alleviates cadmium-induced HepG2 cell toxicity. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2017; 51:30-37. [PMID: 28262510 DOI: 10.1016/j.etap.2017.02.022] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Revised: 02/22/2017] [Accepted: 02/26/2017] [Indexed: 06/06/2023]
Abstract
Alpha-lipoic acid (α-LA) is an important antioxidant that is capable of regenerating other antioxidants, such as glutathione (GSH). However, the underlying molecular mechanism by which α-LA regenerates GSH remains poorly understood. The current study aimed to investigate whether α-LA regenerates GSH by activation of Nrf2 to alleviate cadmium-induced cytotoxicity in HepG2 cells. In the present study, we found that cadmium induced cell death by depletion of GSH through inactivation of Nrf2. Addition of α-LA to cadmium-treated cells reactivated Nrf2 and regenerated GSH through elevating the Nrf2-downstream genes γ-glutamate-cysteine ligase (γ-GCL) and GR, both of which are key enzymes for GSH synthesis. However, blocking Nrf2 with brusatol in the cells co-treated with α-LA and cadmium reduced the mRNA and the protein levels of γ-GCL and GR, thus suppressed GSH regeneration by α-LA. Our results indicated that α-LA activated Nrf2 signaling pathway, which upregulated the transcription of the enzymes for GSH synthesis and therefore GSH contents to alleviate cadmium-induced cytotoxicity in HepG2 cells.
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Affiliation(s)
- Jiayu Zhang
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Xue Zhou
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Wenbo Wu
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Jiachun Wang
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Hong Xie
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China
| | - Zhigang Wu
- Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China; Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, Hubei, PR China.
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13
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Mehta AJ, Guidot DM. Alcohol and the Lung. Alcohol Res 2017; 38:243-254. [PMID: 28988576 PMCID: PMC5513688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Among the many organ systems affected by harmful alcohol use, the lungs are particularly susceptible to infections and injury. The mechanisms responsible for rendering people with alcohol use disorder (AUD) vulnerable to lung damage include alterations in host defenses of the upper and lower airways, disruption of alveolar epithelial barrier integrity, and alveolar macrophage immune dysfunction. Collectively, these derangements encompass what has been termed the "alcoholic lung" phenotype. Alcohol-related reductions in antioxidant levels also may contribute to lung disease in people with underlying AUD. In addition, researchers have identified several regulatory molecules that may play crucial roles in the alcohol-induced disease processes. Although there currently are no approved therapies to combat the detrimental effects of chronic alcohol consumption on the respiratory system, these molecules may be potential therapeutic targets to guide future investigation.
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Affiliation(s)
- Ashish J Mehta
- Ashish J. Mehta, M.D., is an Assistant Professor of Medicine in the Department of Medicine, Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Emory University, Atlanta, Georgia, and a Staff Physician at the Atlanta VA Medical Center, Decatur, Georgia. David M. Guidot, M.D., is a Professor of Medicine in the Department of Medicine, Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Emory University, Atlanta, Georgia, and a Staff Physician at the Atlanta VA Medical Center, Decatur, Georgia
| | - David M Guidot
- Ashish J. Mehta, M.D., is an Assistant Professor of Medicine in the Department of Medicine, Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Emory University, Atlanta, Georgia, and a Staff Physician at the Atlanta VA Medical Center, Decatur, Georgia. David M. Guidot, M.D., is a Professor of Medicine in the Department of Medicine, Division of Pulmonary, Allergy, Critical Care & Sleep Medicine, Emory University, Atlanta, Georgia, and a Staff Physician at the Atlanta VA Medical Center, Decatur, Georgia
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14
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Tomasovic A, Kurrle N, Wempe F, De-Zolt S, Scheibe S, Koli K, Serchinger M, Schnütgen F, Sürün D, Sterner-Kock A, Weissmann N, von Melchner H. Ltbp4 regulates Pdgfrβ expression via TGFβ-dependent modulation of Nrf2 transcription factor function. Matrix Biol 2016; 59:109-120. [PMID: 27645114 DOI: 10.1016/j.matbio.2016.09.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 09/07/2016] [Accepted: 09/11/2016] [Indexed: 10/21/2022]
Abstract
Latent transforming growth factor beta binding protein 4 (LTBP4) belongs to the fibrillin/LTBP family of proteins and plays an important role as a structural component of extracellular matrix (ECM) and local regulator of TGFβ signaling. We have previously reported that Ltbp4S knock out mice (Ltbp4S-/-) develop centrilobular emphysema reminiscent of late stage COPD, which could be partially rescued by inactivating the antioxidant protein Sestrin 2 (Sesn2). More recent studies showed that Sesn2 knock out mice upregulate Pdgfrβ-controlled alveolar maintenance programs that protect against cigarette smoke induced pulmonary emphysema. Based on this, we hypothesized that the emphysema of Ltbp4S-/- mice is primarily caused by defective Pdgfrβ signaling. Here we show that LTBP4 induces Pdgfrβ signaling by inhibiting the antioxidant Nrf2/Keap1 pathway in a TGFβ-dependent manner. Overall, our data identified Ltbp4 as a major player in lung remodeling and injury repair.
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Affiliation(s)
- Ana Tomasovic
- Department of Molecular Hematology, Goethe University Medical School, D-60590 Frankfurt am Main, Germany
| | - Nina Kurrle
- Department of Molecular Hematology, Goethe University Medical School, D-60590 Frankfurt am Main, Germany
| | - Frank Wempe
- Department of Molecular Hematology, Goethe University Medical School, D-60590 Frankfurt am Main, Germany
| | - Silke De-Zolt
- Department of Molecular Hematology, Goethe University Medical School, D-60590 Frankfurt am Main, Germany
| | - Susan Scheibe
- Excellence Cluster Cardiopulmonary System (ECCPS), Justus-Liebig-University Giessen, Department of Internal Medicine, Universities of Giessen and Marburg Lung Center (UGMLC), D-35392 Giessen, Germany
| | - Katri Koli
- Research Programs Unit and Transplantation Laboratory, Haartman Institute, University of Helsinki, 00014, Helsinki, Finland
| | - Martin Serchinger
- Department of Molecular Hematology, Goethe University Medical School, D-60590 Frankfurt am Main, Germany
| | - Frank Schnütgen
- Department of Molecular Hematology, Goethe University Medical School, D-60590 Frankfurt am Main, Germany
| | - Duran Sürün
- Department of Molecular Hematology, Goethe University Medical School, D-60590 Frankfurt am Main, Germany
| | - Anja Sterner-Kock
- Center for Experimental Medicine, Medical Faculty, University of Cologne, 50931 Cologne, Germany
| | - Norbert Weissmann
- Excellence Cluster Cardiopulmonary System (ECCPS), Justus-Liebig-University Giessen, Department of Internal Medicine, Universities of Giessen and Marburg Lung Center (UGMLC), D-35392 Giessen, Germany
| | - Harald von Melchner
- Department of Molecular Hematology, Goethe University Medical School, D-60590 Frankfurt am Main, Germany.
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15
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Sueblinvong V, Mills ST, Neujahr DC, Go YM, Jones DP, Guidot DM. Nuclear Thioredoxin-1 Overexpression Attenuates Alcohol-Mediated Nrf2 Signaling and Lung Fibrosis. Alcohol Clin Exp Res 2016; 40:1846-56. [PMID: 27436123 PMCID: PMC5108489 DOI: 10.1111/acer.13148] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Accepted: 06/07/2016] [Indexed: 12/24/2022]
Abstract
BACKGROUND Alcohol abuse, which impairs antioxidant defenses and promotes acute lung injury, increases Nrf2 nuclear translocation but nevertheless inhibits its activation of the antioxidant response element (ARE). Thioredoxin-1 (Trx1) is required for optimal Nrf2 binding and activation of the ARE, and we hypothesized that its inhibition contributes to impaired Nrf2-ARE signaling in the alcoholic lung. METHODS Lung tissue and primary lung fibroblasts (PLFs) were isolated from C57/BL6 wild-type (WT) and transgenic mice overexpressing the human Trx1 gene with a nuclear localizing sequence (NLS-Tg); some mice consumed alcohol in water prior to lung tissue and PLF isolation; in some mice, acute lung injury was induced with intratracheal bleomycin. In other experiments, PLFs were isolated from WT and NLS-Tg mice and then exposed to alcohol. Finally, PLF isolated from WT mice were transfected with Trx1 expression vector containing either a cytosolic localized sequence (NES) or a nuclear localized sequence (NLS) prior to alcohol exposure. RESULTS Alcohol treatment in vivo or in vitro decreased Trx1 expression, and bleomycin-treated alcohol-fed mice had fibrotic disrepair in their lungs. In parallel, whereas alcohol exposure in vitro increased TGFβ1 expression and decreased Nrf2-ARE activity in PLF from WT mice, these effects were not observed in PLF from NLS-Tg mice. Finally, selective overexpression of Trx1 in the nucleus but not in the cytosol preserved Nrf2-ARE activity during alcohol exposure. CONCLUSIONS Although alcohol-induced redox stress actually promotes Nrf2 nuclear translocation, the coincident suppression of Trx1 impairs Nrf2-ARE activity within the nuclear compartment. Nuclear overexpression of Trx1 restored Nrf2-ARE activity and attenuated alcohol-induced TGFβ1 expression and alcohol-induced exaggerate response to bleomycin-induced acute lung injury.
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Affiliation(s)
- Viranuj Sueblinvong
- Division of Pulmonary, Allergy & Critical Care, Department of Medicine, Atlanta, Georgia
| | - Stephen T Mills
- Division of Pulmonary, Allergy & Critical Care, Department of Medicine, Atlanta, Georgia
| | - David C Neujahr
- Division of Pulmonary, Allergy & Critical Care, Department of Medicine, Atlanta, Georgia.,McKelvey Lung Transplant Center, Emory University School of Medicine, Atlanta, Georgia
| | - Young-Mi Go
- Division of Pulmonary, Allergy & Critical Care, Department of Medicine, Atlanta, Georgia
| | - Dean P Jones
- Division of Pulmonary, Allergy & Critical Care, Department of Medicine, Atlanta, Georgia
| | - David M Guidot
- Division of Pulmonary, Allergy & Critical Care, Department of Medicine, Atlanta, Georgia.,Atlanta VAMC, Decatur, Georgia
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16
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Richter K, Kietzmann T. Reactive oxygen species and fibrosis: further evidence of a significant liaison. Cell Tissue Res 2016; 365:591-605. [PMID: 27345301 PMCID: PMC5010605 DOI: 10.1007/s00441-016-2445-3] [Citation(s) in RCA: 205] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 06/02/2016] [Indexed: 02/06/2023]
Abstract
Age-related diseases such as obesity, diabetes, non-alcoholic fatty liver disease, chronic kidney disease and cardiomyopathy are frequently associated with fibrosis. Work within the last decade has improved our understanding of the pathophysiological mechanisms contributing to fibrosis development. In particular, oxidative stress and the antioxidant system appear to be crucial modulators of processes such as transforming growth factor-β1 (TGF-β1) signalling, metabolic homeostasis and chronic low-grade inflammation, all of which play important roles in fibrosis development and persistence. In the current review, we discuss the connections between reactive oxygen species, antioxidant enzymes and TGF-β1 signalling, together with functional consequences, reflecting a concept of redox-fibrosis that can be targeted in future therapies. ᅟ ![]()
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Affiliation(s)
- Kati Richter
- Faculty of Biochemistry and Molecular Medicine and Biocenter Oulu, University of Oulu, Aapistie 7A, FI-90230, Oulu, Finland
| | - Thomas Kietzmann
- Faculty of Biochemistry and Molecular Medicine and Biocenter Oulu, University of Oulu, Aapistie 7A, FI-90230, Oulu, Finland.
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17
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Summary of the 2014 Alcohol and Immunology Research Interest Group (AIRIG) meeting. Alcohol 2015; 49:767-72. [PMID: 26520175 DOI: 10.1016/j.alcohol.2015.09.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 09/21/2015] [Accepted: 09/21/2015] [Indexed: 02/08/2023]
Abstract
On November 21, 2014 the 19th annual Alcohol and Immunology Research Interest Group (AIRIG) meeting was held at Loyola University Chicago Health Sciences Campus in Maywood, Illinois. The meeting focused broadly on inflammatory cell signaling responses in the context of alcohol and alcohol-use disorders, and was divided into four plenary sessions focusing on the gut and liver, lung infections, general systemic effects of alcohol, and neuro-inflammation. One common theme among many talks was the differential roles of macrophages following both chronic and acute alcohol intoxication. Macrophages were shown to play significant roles in regulating inflammation, oxidative stress, and viral infection following alcohol exposure in the liver, lungs, adipose tissue, and brain. Other work examined the role of alcohol on disease progression in a variety of pathologies including psoriasis, advanced stage lung disease, and cancer.
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18
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Richter K, Konzack A, Pihlajaniemi T, Heljasvaara R, Kietzmann T. Redox-fibrosis: Impact of TGFβ1 on ROS generators, mediators and functional consequences. Redox Biol 2015; 6:344-352. [PMID: 26335400 PMCID: PMC4565043 DOI: 10.1016/j.redox.2015.08.015] [Citation(s) in RCA: 161] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Revised: 08/19/2015] [Accepted: 08/25/2015] [Indexed: 02/06/2023] Open
Abstract
Fibrosis is one of the most prevalent features of age-related diseases like obesity, diabetes, non-alcoholic fatty liver disease, chronic kidney disease, or cardiomyopathy and affects millions of people in all countries. Although the understanding about the pathophysiology of fibrosis has improved a lot during the recent years, a number of mechanisms still remain unknown. Although TGF-β1 signaling, loss of metabolic homeostasis and chronic low-grade inflammation appear to play important roles in the pathogenesis of fibrosis, recent evidence indicates that oxidative stress and the antioxidant system may also be crucial for fibrosis development and persistence. These findings point to a concept of a redox-fibrosis where the cellular oxidant and antioxidant system could be potential therapeutic targets. The current review aims to summarize the existing links between TGF-β1 signaling, generation and action of reactive oxygen species, expression of antioxidative enzymes, and functional consequences including epigenetic redox-mediated responses during fibrosis.
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Affiliation(s)
- Kati Richter
- Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Anja Konzack
- Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Oulu, Finland
| | - Taina Pihlajaniemi
- Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Oulu, Finland; Center of Excellence in Cell-Extracellular Matrix Research, Finland
| | - Ritva Heljasvaara
- Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Oulu, Finland; Center of Excellence in Cell-Extracellular Matrix Research, Finland
| | - Thomas Kietzmann
- Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, Oulu, Finland.
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19
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Traphagen N, Tian Z, Allen-Gipson D. Chronic Ethanol Exposure: Pathogenesis of Pulmonary Disease and Dysfunction. Biomolecules 2015; 5:2840-53. [PMID: 26492278 PMCID: PMC4693259 DOI: 10.3390/biom5042840] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 09/04/2015] [Accepted: 09/28/2015] [Indexed: 12/18/2022] Open
Abstract
Ethanol (EtOH) is the world’s most commonly used drug, and has been widely recognized as a risk factor for developing lung disorders. Chronic EtOH exposure affects all of the organ systems in the body and increases the risk of developing pulmonary diseases such as acute lung injury and pneumonia, while exacerbating the symptoms and resulting in increased mortality in many other lung disorders. EtOH and its metabolites inhibit the immune response of alveolar macrophages (AMs), increase airway leakage, produce damaging reactive oxygen species (ROS), and disrupt the balance of antioxidants/oxidants within the lungs. In this article, we review the role of EtOH exposure in the pathogenesis and progression of pulmonary disease.
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Affiliation(s)
- Nicole Traphagen
- Department of Pharmaceutical Sciences, College of Pharmacy, University of South Florida Health, Tampa, FL 33612, USA.
| | - Zhi Tian
- Department of Pharmaceutical Sciences, College of Pharmacy, University of South Florida Health, Tampa, FL 33612, USA.
| | - Diane Allen-Gipson
- Department of Pharmaceutical Sciences, College of Pharmacy, University of South Florida Health, Tampa, FL 33612, USA.
- Department of Internal Medicine, Division of Allergy and Immunology, University of South Florida Health, Tampa, FL 33612, USA.
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