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Dietz RM, Wright CJ. Oxidative stress diseases unique to the perinatal period: A window into the developing innate immune response. Am J Reprod Immunol 2017; 79:e12787. [PMID: 29194835 DOI: 10.1111/aji.12787] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 10/31/2017] [Indexed: 12/15/2022] Open
Abstract
The innate immune system has evolved to play an integral role in the normally developing lung and brain. However, in response to oxidative stress, innate immunity, mediated by specific cellular and molecular programs and signaling, contributes to pathology in these same organ systems. Despite opposing drivers of oxidative stress, namely hyperoxia in neonatal lung injury and hypoxia/ischemia in neonatal brain injury, similar pathways-including toll-like receptors, NFκB and MAPK cascades-have been implicated in tissue damage. In this review, we consider recent insights into the innate immune response to oxidative stress in both neonatal and adult models to better understand hyperoxic lung injury and hypoxic-ischemic brain injury across development and aging. These insights support the development of targeted immunotherapeutic strategies to address the challenge of harnessing the innate immune system in oxidative stress diseases of the neonate.
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Affiliation(s)
- Robert M Dietz
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
| | - Clyde J Wright
- Section of Neonatology, Department of Pediatrics, University of Colorado School of Medicine and Children's Hospital Colorado, Aurora, CO, USA
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Novel tumor-suppressor function of KLF4 in pediatric T-cell acute lymphoblastic leukemia. Exp Hematol 2017; 53:16-25. [PMID: 28479419 DOI: 10.1016/j.exphem.2017.04.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 04/21/2017] [Accepted: 04/22/2017] [Indexed: 02/07/2023]
Abstract
Acute lymphoblastic leukemia (ALL) is the most common hematological malignancy in pediatric patients. Despite advances in the treatment of this disease, many children with T-cell ALL (T-ALL) die from disease relapse due to low responses to standard chemotherapy and the lack of a targeted therapy that selectively eradicates the chemoresistant leukemia-initiating cells (LICs) responsible for disease recurrence. We reported recently that the reprogramming factor Krüppel-like factor 4 (KLF4) has a tumor-suppressive function in children with T-ALL. KLF4 silencing by promoter deoxyribonucleic acid (DNA) methylation in patients with T-ALL leads to aberrant activation of the mitogen-activated protein kinase kinase MAP2K7 and the downstream c-Jun NH2-terminal kinase (JNK) pathway that controls the expansion of leukemia cells via c-Jun and activating transcription factor 2. This pathway can be inhibited with small molecules and therefore has the potential to eliminate LICs and eradicate disease in combination with standard therapy for patients with refractory and relapsed disease. The present review summarizes the role of the KLF4-MAP2K7 pathway in T-ALL pathogenesis and the function of JNK and MAP2K7 in carcinogenesis and therapy.
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Porzionato A, Sfriso MM, Mazzatenta A, Macchi V, De Caro R, Di Giulio C. Effects of hyperoxic exposure on signal transduction pathways in the lung. Respir Physiol Neurobiol 2015; 209:106-14. [DOI: 10.1016/j.resp.2014.12.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 11/26/2014] [Accepted: 12/01/2014] [Indexed: 12/18/2022]
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Bhargava M, Dey S, Becker T, Steinbach M, Wu B, Lee SM, Higgins L, Kumar V, Bitterman PB, Ingbar DH, Wendt CH. Protein expression profile of rat type two alveolar epithelial cells during hyperoxic stress and recovery. Am J Physiol Lung Cell Mol Physiol 2013; 305:L604-14. [PMID: 24014686 PMCID: PMC3840279 DOI: 10.1152/ajplung.00079.2013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Accepted: 09/03/2013] [Indexed: 01/03/2023] Open
Abstract
In rodent model systems, the sequential changes in lung morphology resulting from hyperoxic injury are well characterized and are similar to changes in human acute respiratory distress syndrome. In the injured lung, alveolar type two (AT2) epithelial cells play a critical role in restoring the normal alveolar structure. Thus characterizing the changes in AT2 cells will provide insights into the mechanisms underpinning the recovery from lung injury. We applied an unbiased systems-level proteomics approach to elucidate molecular mechanisms contributing to lung repair in a rat hyperoxic lung injury model. AT2 cells were isolated from rat lungs at predetermined intervals during hyperoxic injury and recovery. Protein expression profiles were determined by using iTRAQ with tandem mass spectrometry. Of the 959 distinct proteins identified, 183 significantly changed in abundance during the injury-recovery cycle. Gene ontology enrichment analysis identified cell cycle, cell differentiation, cell metabolism, ion homeostasis, programmed cell death, ubiquitination, and cell migration to be significantly enriched by these proteins. Gene set enrichment analysis of data acquired during lung repair revealed differential expression of gene sets that control multicellular organismal development, systems development, organ development, and chemical homeostasis. More detailed analysis identified activity in two regulatory pathways, JNK and miR 374. A novel short time-series expression miner algorithm identified protein clusters with coherent changes during injury and repair. We concluded that coherent changes occur in the AT2 cell proteome in response to hyperoxic stress. These findings offer guidance regarding the specific molecular mechanisms governing repair of the injured lung.
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Budinger GRS, Mutlu GM. Balancing the risks and benefits of oxygen therapy in critically III adults. Chest 2013; 143:1151-1162. [PMID: 23546490 DOI: 10.1378/chest.12-1215] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Oxygen therapy is an integral part of the treatment of critically ill patients. Maintenance of adequate oxygen delivery to vital organs often requires the administration of supplemental oxygen, sometimes at high concentrations. Although oxygen therapy is lifesaving, it may be associated with deleterious effects when administered for prolonged periods at high concentrations. Here, we review the recent advances in our understanding of the molecular responses to hypoxia and high levels of oxygen and review the current guidelines for oxygen therapy in critically ill patients.
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Affiliation(s)
- G R Scott Budinger
- Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL.
| | - Gökhan M Mutlu
- Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL
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Zhang Y, Jiang G, Sauler M, Lee PJ. Lung endothelial HO-1 targeting in vivo using lentiviral miRNA regulates apoptosis and autophagy during oxidant injury. FASEB J 2013; 27:4041-58. [PMID: 23771928 DOI: 10.1096/fj.13-231225] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The lung endothelium is a major target for inflammatory and oxidative stress. Heme oxygenase-1 (HO-1) induction is a crucial defense mechanism during oxidant challenges, such as hyperoxia. The role of lung endothelial HO-1 during hyperoxia in vivo is not well defined. We engineered lentiviral vectors with microRNA (miRNA) sequences controlled by vascular endothelium cadherin (VE-cad) to study the specific role of lung endothelial HO-1. Wild-type (WT) murine lung endothelial cells (MLECs) or WT mice were treated with lentivirus and exposed to hyperoxia (95% oxygen). We detected HO-1 knockdown (∼55%) specifically in the lung endothelium. MLECs and lungs showed approximately a 2-fold increase in apoptosis and ROS generation after HO-1 silencing. We also demonstrate for the first time that silencing endothelial HO-1 has the same effect on lung injury and survival as silencing HO-1 in multiple lung cell types and that HO-1 regulates caspase 3 activation and autophagy in endothelium during hyperoxia. These studies demonstrate the utility of endothelial-targeted gene silencing in vivo using lentiviral miRNA constructs to assess gene function and that endothelial HO-1 is an important determinant of survival during hyperoxia.
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Affiliation(s)
- Yi Zhang
- 1Section of Pulmonary, Critical Care, and Sleep Medicine, Yale University School of Medicine, P.O. Box 208057, New Haven, CT 06520-8057, USA.
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Li Z, Choo-Wing R, Sun H, Sureshbabu A, Sakurai R, Rehan VK, Bhandari V. A potential role of the JNK pathway in hyperoxia-induced cell death, myofibroblast transdifferentiation and TGF-β1-mediated injury in the developing murine lung. BMC Cell Biol 2011; 12:54. [PMID: 22172122 PMCID: PMC3266206 DOI: 10.1186/1471-2121-12-54] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Accepted: 12/15/2011] [Indexed: 12/22/2022] Open
Abstract
Background Transforming growth factor-beta 1 (TGF-β1) has been implicated in hyperoxia-induced cell death and impaired alveolarization in the developing lung. In addition, the c-JunNH2-terminal kinase (JNK) pathway has been shown to have a role for TGF-β1-mediated effects. We hypothesized that the JNK pathway is an important regulator of hyperoxia-induced pulmonary responses in the developing murine lung. Results We used cultured human lung epithelial cells, fetal rat lung fibroblasts and a neonatal TGF-β1 transgenic mouse model. We demonstrate that hyperoxia inhibits cell proliferation, activates cell death mediators and causes cell death, and promotes myofibroblast transdifferentiation, in a dose-dependent manner. Except for fibroblast proliferation, the effects were mediated via the JNK pathway. In addition, since we observed increased expression of TGF-β1 by epithelial cells on exposure to hyperoxia, we used a TGF-β1 transgenic mouse model to determine the role of JNK activation in TGF-β1 induced effects on lung development and on exposure to hyperoxia. We noted that, in this model, inhibition of JNK signaling significantly improved the spontaneously impaired alveolarization in room air and decreased mortality on exposure to hyperoxia. Conclusions When viewed in combination, these studies demonstrate that hyperoxia-induced cell death, myofibroblast transdifferentiation, TGF-β1- and hyperoxia-mediated pulmonary responses are mediated, at least in part, via signaling through the JNK pathway.
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Affiliation(s)
- Zhang Li
- Division of Perinatal Medicine, Department of Pediatrics, Yale University School of Medicine, New Haven, CT 06520, USA
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Tanaka A, Jin Y, Lee SJ, Zhang M, Kim HP, Stolz DB, Ryter SW, Choi AMK. Hyperoxia-induced LC3B interacts with the Fas apoptotic pathway in epithelial cell death. Am J Respir Cell Mol Biol 2011; 46:507-14. [PMID: 22095627 DOI: 10.1165/rcmb.2009-0415oc] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Epithelial cell death plays a critical role in hyperoxia-induced lung injury. We investigated the involvement of the autophagic marker microtubule-associated protein-1 light chain-3B (LC3B) in epithelial cell apoptosis after hyperoxia. Prolonged hyperoxia (>95% O(2)), which causes characteristic lung injury in mice, activated morphological and biochemical markers of autophagy. Hyperoxia induced the time-dependent expression and conversion of LC3B-I to LC3B-II in mouse lung in vivo and in cultured epithelial cells (Beas-2B, human bronchial epithelial cells) in vitro. Hyperoxia increased autophagosome formation in Beas-2B cells, as evidenced by electron microscopy and increased GFP-LC3 puncta. The augmented LC3B level after hyperoxia was transcriptionally regulated and dependent in part on the c-Jun N-terminal kinase pathway. We hypothesized that LC3B plays a regulatory role in hyperoxia-induced epithelial apoptosis. LC3B siRNA promoted hyperoxia-induced cell death in epithelial cells, whereas overexpression of LC3B conferred cytoprotection after hyperoxia. The autophagic protein LC3B cross-regulated the Fas apoptotic pathway by physically interacting with the components of death-inducing signaling complex. This interaction was mediated by caveolin-1 tyrosine 14, which is a known target of phosphorylation induced by hyperoxia. Taken together, hyperoxia-induced LC3B activation regulates the Fas apoptotic pathway and thus confers cytoprotection in lung epithelial cells. The interaction of LC3B and Fas pathways requires cav-1.
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Affiliation(s)
- Akihiko Tanaka
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
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Li W, Chang L, Rong Z, Liu W. Retinoic acid diminished the expression of MMP-2 in hyperoxia-exposed premature rat lung fibroblasts through regulating mitogen-activated protein kinases. ACTA ACUST UNITED AC 2011; 31:251-257. [PMID: 21505995 DOI: 10.1007/s11596-011-0262-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Indexed: 12/01/2022]
Abstract
This study examined the effects of retinoic acid (RA), PD98059, SP600125 and SB203580 on the hyperoxia-induced expression and regulation of matrix metalloproteinase-2 (MMP-2) and metalloproteinase-2 (TIMP-2) in premature rat lung fibroblasts (LFs). LFs were exposed to hyperoxia or room air for 12 h in the presence of RA and the kinase inhibitors PD98059 (ERK1/2), SP600125 (JNK1/2) and SB203580 (p38) respectively. The expression levels of MMP-2 and TIMP-2 mRNA were detected by semi-quantitative reverse transcription polymerase chain reaction (RT-PCR). MMP-2 activity was measured by zymography. The amount of p-ERK1/2, REK1/2, p-JNK1/2, JNK1/2, p-p38 and p38 was determined by Western blotting. The results showed that: (1) PD98059, SP600125 and SB203580 significantly inhibited p-ERK1/2, p-JNK1/2 and p-p38 respectively in LFs; (2) The expression of MMP-2 mRNA in LFs exposed to hyperoxia was decreased after treatment with RA, SP600125 and SB203580 respectively (P<0.01 or 0.05), but did not change after treatment with PD98059 (P>0.05). Meanwhile, RA, PD98059, SP600125 and SB203580 had no effect on the expression of TIMP-2 mRNA in LFs exposed to room air or hyperoxia (P>0.05); (3) The expression of pro- and active MMP-2 experienced no change after treatment with RA or SP600125 in LFs exposed to room air (P>0.05), but decreased remarkably after hyperoxia (P<0.01 or 0.05). SB203580 inhibited the expression of pro- and active MMP-2 either in room air or under hyperoxia (P<0.01). PD98059 exerted no effect on the expression of pro- and active MMP-2 (P<0.05). It was suggested that RA had a protective effect on hyperoxia-induced lung injury by down-regulating the expression of MMP-2 through decreasing the JNK and p38 activation in hyperoxia.
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Affiliation(s)
- Wenbin Li
- Department of Pediatrics, Tongji Hospital, Tongji Medical University, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Liwen Chang
- Department of Pediatrics, Tongji Hospital, Tongji Medical University, Huazhong University of Science and Technology, Wuhan, 430030, China.
| | - Zhihui Rong
- Department of Pediatrics, Tongji Hospital, Tongji Medical University, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Wei Liu
- Department of Pediatrics, Tongji Hospital, Tongji Medical University, Huazhong University of Science and Technology, Wuhan, 430030, China
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Lee J, Reddy R, Barsky L, Scholes J, Chen H, Shi W, Driscoll B. Lung alveolar integrity is compromised by telomere shortening in telomerase-null mice. Am J Physiol Lung Cell Mol Physiol 2008; 296:L57-70. [PMID: 18952756 DOI: 10.1152/ajplung.90411.2008] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Shortened telomeres are a normal consequence of cell division. However, telomere shortening past a critical point results in cellular senescence and death. To determine the effect of telomere shortening on lung, four generations of B6.Cg-Terc(tm1Rdp) mice, null for the terc component of telomerase, the holoenzyme that maintains telomeres, were bred and analyzed. Generational inbreeding of terc-/- mice caused sequential shortening of telomeres. Lung histology from the generation with the shortest telomeres (terc-/- F4) showed alveolar wall thinning and increased alveolar size. Morphometric analysis confirmed a significant increase in mean linear intercept (MLI). terc-/- F4 lung showed normal elastin deposition but had significantly decreased collagen content. Both airway and alveolar epithelial type 1 cells (AEC1) appeared normal by immunohistochemistry, and the percentage of alveolar epithelial type 2 cells (AEC2) per total cell number was similar to wild type. However, because of a decrease in distal lung cellularity, the absolute number of AEC2 in terc-/- F4 lung was significantly reduced. In contrast to wild type, terc-/- F4 distal lung epithelium from normoxia-maintained mice exhibited DNA damage by terminal deoxynucleotidyltransferase (TdT)-mediated dUTP nick end labeling (TUNEL) and 8-oxoguanine immunohistochemistry. Western blotting of freshly isolated AEC2 lysates for stress signaling kinases confirmed that the stress-activated protein kinase (SAPK)/c-Jun NH(2)-terminal kinase (JNK) stress response pathway is stimulated in telomerase-null AEC2 even under normoxic conditions. Expression of downstream apoptotic/stress markers, including caspase-3, caspase-6, Bax, and HSP-25, was also observed in telomerase-null, but not wild-type, AEC2. TUNEL analysis of freshly isolated normoxic AEC2 showed that DNA strand breaks, essentially absent in wild-type cells, increased with each successive terc-/- generation and correlated strongly with telomere length (R(2) = 0.9631). Thus lung alveolar integrity, particularly in the distal epithelial compartment, depends on proper telomere maintenance.
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Affiliation(s)
- Jooeun Lee
- Saban Inst. for Research, Childrens Hospital Los Angeles, MS 35, 4661 Sunset Blvd., Los Angeles, CA 90027, USA
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Joseph A, Li Y, Koo HC, Davis JM, Pollack S, Kazzaz JA. Superoxide dismutase attenuates hyperoxia-induced interleukin-8 induction via AP-1. Free Radic Biol Med 2008; 45:1143-9. [PMID: 18692129 DOI: 10.1016/j.freeradbiomed.2008.07.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2007] [Revised: 05/30/2008] [Accepted: 07/10/2008] [Indexed: 10/21/2022]
Abstract
Exposure of lung epithelial cells to hyperoxia results in the generation of excess reactive oxygen species (ROS), cell damage, and production of proinflammatory cytokines (interleukin-8; IL-8). Although activation of the NF-kappaB and c-Jun N-terminal kinase (JNK)/activator protein (AP)-1 transcription pathways occurs in hyperoxia, it is unclear whether activation of the AP-1 pathway has a direct impact on IL-8 production and whether overexpression of superoxide dismutase (SOD) can mitigate these proinflammatory processes. A549 cells were exposed to 95% O(2), and ROS production, AP-1 activation, and IL-8 levels were determined. Experimental groups included cells transduced with a recombinant adenovirus encoding CuZnSOD or MnSOD (two- to threefold increased activity) or transfected with a JNK1 small interfering RNA (RNAi). Hyperoxia resulted in significant increases in ROS generation, AP-1 activation, and IL-8 production, which were significantly attenuated by overexpression of either MnSOD or CuZnSOD. JNK1 RNAi also moderated IL-8 induction. The data indicate that activation of JNK1/AP-1 and subsequent IL-8 induction in hyperoxia are mediated by intracellular ROS, with SOD having significant protective effects.
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Affiliation(s)
- Ansamma Joseph
- CardioPulmonary Research Institute, Department of Medicine, Winthrop University Hospital, State University of New York Stony Brook School of Medicine, Mineola, NY 11501, USA
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Waldow T, Witt W, Ulmer A, Janke A, Alexiou K, Matschke K. Preconditioning by inhaled nitric oxide prevents hyperoxic and ischemia/reperfusion injury in rat lungs. Pulm Pharmacol Ther 2008; 21:418-29. [PMID: 18453045 DOI: 10.1016/j.pupt.2007.10.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Since the generation of nitric oxide (NO) is an essential step in the trigger phase of ischemic preconditioning, short-term inhalation of NO before ischemia should ameliorate ischemia/reperfusion (I/R) injury of the lung. We tested this hypothesis in high oxygen (>99%) ventilated rats in order to additionally evaluate compatibility of NO and exposure to hyperoxia. Male adult Sprague-Dawley rats inhaled NO (15 ppm, 10 min) before the left lung hilum was clamped for 1 h, and the reperfusion phase was observed for 4 h (NO group). Animals in the I/R group underwent the same treatment, but without NO inhalation. A third group without I/R served as time-matched controls. Animals in the I/R group showed severe I/R injury in terms of arterial pO2 (apO2), which was reduced to 22% of surgical controls (SCs) at time point 30 min reperfusion, and increased endothelial permeability (Evans blue procedure). The pretreatment with NO attenuated these effects. The pO2 after 4 h reperfusion was still 3.0-fold higher in the NO group compared to I/R. In contrast, the I/R- and hyperoxia-induced invasion of leukocytes, as determined by measuring myeloperoxidase (MPO) activity, was not affected by NO. These data were correlated with the activity of major cellular signaling pathways by measuring the phosphorylation at activating and inhibitory sites of extracellular-signal regulated kinase (ERK), c-Jun N-terminal kinase (JNK), p38, protein kinase B (AKT), and glycogen synthase kinase 3beta (GSK-3beta), and by determination of cGMP in plasma and lung tissue. Inhalation of NO partly prevented the loss of activation by I/R and hyperoxic ventilation of ERK, JNK, and AKT, and it reduced the I/R-induced activation of GSK-3beta. The level of cGMP in plasma and lung tissue was increased in the NO group after 4 h reperfusion. In conclusion, application of inhaled NO in the preconditioning mode prevented I/R injury in the rat lung without interfering effects of hyperoxic ventilation. The effects of NO on cellular signaling pathways resemble mechanisms of ischemic preconditioning, but further studies have to evaluate the physiological relevance of these results.
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Affiliation(s)
- Thomas Waldow
- Clinic for Cardiac Surgery, University Hospital Dresden, Fetscherstr. 76, 01307 Dresden, Germany
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Dolinay T, Wu W, Kaminski N, Ifedigbo E, Kaynar AM, Szilasi M, Watkins SC, Ryter SW, Hoetzel A, Choi AMK. Mitogen-activated protein kinases regulate susceptibility to ventilator-induced lung injury. PLoS One 2008; 3:e1601. [PMID: 18270588 PMCID: PMC2223071 DOI: 10.1371/journal.pone.0001601] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2007] [Accepted: 01/17/2008] [Indexed: 01/09/2023] Open
Abstract
Background Mechanical ventilation causes ventilator-induced lung injury in animals and humans. Mitogen-activated protein kinases have been implicated in ventilator-induced lung injury though their functional significance remains incomplete. We characterize the role of p38 mitogen-activated protein kinase/mitogen activated protein kinase kinase-3 and c-Jun-NH2-terminal kinase-1 in ventilator-induced lung injury and investigate novel independent mechanisms contributing to lung injury during mechanical ventilation. Methodology and Principle Findings C57/BL6 wild-type mice and mice genetically deleted for mitogen-activated protein kinase kinase-3 (mkk-3−/−) or c-Jun-NH2-terminal kinase-1 (jnk1−/−) were ventilated, and lung injury parameters were assessed. We demonstrate that mkk3−/− or jnk1−/− mice displayed significantly reduced inflammatory lung injury and apoptosis relative to wild-type mice. Since jnk1−/− mice were highly resistant to ventilator-induced lung injury, we performed comprehensive gene expression profiling of ventilated wild-type or jnk1−/− mice to identify novel candidate genes which may play critical roles in the pathogenesis of ventilator-induced lung injury. Microarray analysis revealed many novel genes differentially expressed by ventilation including matrix metalloproteinase-8 (MMP8) and GADD45α. Functional characterization of MMP8 revealed that mmp8−/− mice were sensitized to ventilator-induced lung injury with increased lung vascular permeability. Conclusions We demonstrate that mitogen-activated protein kinase pathways mediate inflammatory lung injury during ventilator-induced lung injury. C-Jun-NH2-terminal kinase was also involved in alveolo-capillary leakage and edema formation, whereas MMP8 inhibited alveolo-capillary protein leakage.
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Affiliation(s)
- Tamás Dolinay
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
- Department of Pulmonology, University of Debrecen Medical and Health Science Center, Debrecen, Hungary
| | - Wei Wu
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
| | - Naftali Kaminski
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
| | - Emeka Ifedigbo
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
| | - A. Murat Kaynar
- Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Mária Szilasi
- Department of Pulmonology, University of Debrecen Medical and Health Science Center, Debrecen, Hungary
| | - Simon C. Watkins
- Department of Cell Biology and Physiology, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - Stefan W. Ryter
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
| | - Alexander Hoetzel
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
- Department of Anesthesiology and Critical Care Medicine, University of Freiburg, Freiburg, Germany
| | - Augustine M. K. Choi
- Division of Pulmonary, Allergy and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, Unites States of America
- Division of Pulmonary and Critical Care Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, United States of America
- * To whom correspondence should be addressed. E-mail:
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Abstract
PURPOSE OF REVIEW Hyperoxic inspired gas is essential for patients with hypoxic respiratory failure; it is also suspected, however, as a contributor to the pathogenesis of acute lung injury. Several recent studies in humans, animals, and cell culture have identified mechanisms by which hyperoxia may exert deleterious effects on critically ill patients. This review identifies relevant new findings regarding hyperoxic lung injury in the context of providing guidance for future clinical studies. RECENT FINDINGS Recent studies have clarified the roles of both receptor-mediated and mitochondrial cell death pathways in experimental hyperoxic lung injury. Studies in animals demonstrate that hyperoxia interacts with mechanical stretch to augment ventilator-induced lung injury. Finally, studies in humans implicate hyperoxia in impairment of host defense responses to infections. SUMMARY Although hyperoxia has not been conclusively identified as a clinically important cause of lung injury in humans, animal data strongly implicate it. Reports of interaction effects between hyperoxia and both mechanical ventilation and host defense suggest that clinical studies of hyperoxia must take these variables into account. Accumulating data about how hyperoxia initiates cell death provide guidance for development of both biomarkers to identify hyperoxia-induced injury and pharmacological interventions to limit hyperoxia's adverse effects.
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Affiliation(s)
- William A Altemeier
- Department of Medicine, University of Washington, Seattle, Washington 98195-6522, USA.
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15
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Li LF, Liao SK, Ko YS, Lee CH, Quinn DA. Hyperoxia increases ventilator-induced lung injury via mitogen-activated protein kinases: a prospective, controlled animal experiment. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2007; 11:R25. [PMID: 17316425 PMCID: PMC2151853 DOI: 10.1186/cc5704] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2006] [Revised: 01/09/2007] [Accepted: 02/22/2007] [Indexed: 01/13/2023]
Abstract
Introduction Large-tidal volume (VT) mechanical ventilation and hyperoxia used in patients with acute respiratory distress syndrome can damage pulmonary epithelial cells through lung inflammation and apoptotic cell death. Hyperoxia has been shown to increase ventilator-induced lung injury, but the mechanisms regulating interaction between large VT and hyperoxia are unclear. We hypothesized that the addition of hyperoxia to large-VT ventilation would increase neutrophil infiltration by upregulation of the cytokine macrophage inflammatory protein-2 (MIP-2) and would increase apoptosis via the mitogen-activated protein kinase pathways. Methods C57BL/6 mice were exposed to high-VT (30 ml/kg) mechanical ventilation with room air or hyperoxia for one to five hours. Results The addition of hyperoxia to high-VT ventilation augmented lung injury, as demonstrated by increased apoptotic cell death, neutrophil migration into the lung, MIP-2 production, MIP-2 mRNA expression, increased DNA binding activity of activator protein-1, increased microvascular permeability, and c-Jun NH2-terminal kinase (JNK) and extracellular signal-regulated kinase (ERK) 1/2 activation. Hyperoxia-induced augmentation of high-VT-induced lung injury was attenuated in JNK-deficient mice and in mice with pharmacologic inhibition of ERK activity by PD98059. However, only JNK-deficient mice, and not mice with ERK activity inhibition by PD98059, were protected from high-VT-induced lung injury without hyperoxia. Conclusion We conclude that hyperoxia increased high-VT-induced cytokine production, neutrophil influx, and apoptotic cell death through activation of the JNK and ERK1/2 pathways.
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Affiliation(s)
- Li-Fu Li
- Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital, and Chang Gung University, 5 Fu-Hsing Street, Kweishan, Taoyuan 333, Taiwan
- Department of Respiratory Therapy, Chang Gung Memorial Hospital, 5 Fu-Hsing Street, Kweishan, Taoyuan 333, Taiwan
| | - Shuen-Kuei Liao
- Graduate Institute of Clinical Medical Sciences, Chang Gung University, 259 Wen-Hwa 1st Road, Kweishan, Taoyuan 333, Taiwan
| | - Yu-Shien Ko
- The First Cardiovascular Division, Department of Internal Medicine, Chang Gung Memorial Hospital, and Chang Gung University, 5 Fu-Hsing Street, Kweishan, Taoyuan 333, Taiwan
| | - Cheng-Huei Lee
- Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital, and Chang Gung University, 5 Fu-Hsing Street, Kweishan, Taoyuan 333, Taiwan
- Department of Respiratory Therapy, Chang Gung Memorial Hospital, 5 Fu-Hsing Street, Kweishan, Taoyuan 333, Taiwan
| | - Deborah A Quinn
- Pulmonary and Critical Care Units, Department of Medicine, Massachusetts General Hospital, and Harvard Medical School, 55 Fruit Street, Boston, MA, USA
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Zaher TE, Miller EJ, Morrow DMP, Javdan M, Mantell LL. Hyperoxia-induced signal transduction pathways in pulmonary epithelial cells. Free Radic Biol Med 2007; 42:897-908. [PMID: 17349918 PMCID: PMC1876680 DOI: 10.1016/j.freeradbiomed.2007.01.021] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2006] [Revised: 01/05/2007] [Accepted: 01/08/2007] [Indexed: 10/23/2022]
Abstract
Mechanical ventilation with hyperoxia is necessary to treat critically ill patients. However, prolonged exposure to hyperoxia leads to the generation of excessive reactive oxygen species (ROS), which can cause acute inflammatory lung injury. One of the major effects of hyperoxia is the injury and death of pulmonary epithelium, which is accompanied by increased levels of pulmonary proinflammatory cytokines and excessive leukocyte infiltration. A thorough understanding of the signaling pathways leading to pulmonary epithelial cell injury/death may provide some insights into the pathogenesis of hyperoxia-induced acute inflammatory lung injury. This review focuses on epithelial responses to hyperoxia and some of the major factors regulating pathways to epithelial cell injury/death, and proinflammatory responses on exposure to hyperoxia. We discuss in detail some of the most interesting players, such as NF-kappaB, that can modulate both proinflammatory responses and cell injury/death of lung epithelial cells. A better appreciation for the functions of these factors will no doubt help us to delineate the pathways to hyperoxic cell death and proinflammatory responses.
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Affiliation(s)
- Tahereh E. Zaher
- Department of Pharmaceutical Sciences, St. John’s University College of Pharmacy, Queens, NY 11439
- Cardiopulmonary Research, The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - Edmund J. Miller
- Surgercal Immunology, The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - Dympna M. P. Morrow
- Cardiopulmonary Research, The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - Mohammad Javdan
- Cardiopulmonary Research, The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
| | - Lin L. Mantell
- Department of Pharmaceutical Sciences, St. John’s University College of Pharmacy, Queens, NY 11439
- Cardiopulmonary Research, The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, NY 11030
- *Correspondence author: Lin L. Mantell, Department of Pharmaceutical Sciences, St. John’s University College of Pharmacy, 108/SB28 St. Albert Hall, 8000 Utopia Parkway, Queens, New York 11439, Tel: 718-990-5933, Fax: 718-990-1877,
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Bellmeyer A, Martino JM, Chandel NS, Scott Budinger GR, Dean DA, Mutlu GM. Leptin resistance protects mice from hyperoxia-induced acute lung injury. Am J Respir Crit Care Med 2006; 175:587-94. [PMID: 17185651 PMCID: PMC1899284 DOI: 10.1164/rccm.200603-312oc] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
RATIONALE Human data suggest that the incidence of acute lung injury is reduced in patients with type II diabetes mellitus. However, the mechanisms by which diabetes confers protection from lung injury are unknown. OBJECTIVES To determine whether leptin resistance, which is seen in humans with diabetes, protects mice from hyperoxic lung injury. METHODS Wild-type (leptin responsive) and db/db (leptin resistant) mice were used in these studies. Mice were exposed to hyperoxia (100% O(2)) for 84 hours to induce lung injury and up to 168 hours for survival studies. Alveolar fluid clearance was measured in vivo. MEASUREMENTS AND MAIN RESULTS Lung leptin levels were increased both in wild-type and leptin receptor-defective db/db mice after hyperoxia. Hyperoxia-induced lung injury was decreased in db/db compared with wild-type mice. Hyperoxia increased lung permeability in wild-type mice but not in db/db mice. Compared with wild-type control animals, db/db mice were resistant to hyperoxia-induced mortality (lethal dose for 50% of mice, 152 vs. 108 h). Intratracheal instillation of leptin at a dose that was observed in the bronchoalveolar lavage fluid during hyperoxia caused lung injury in wild-type but not in db/db mice. Intratracheal pretreatment with a leptin receptor inhibitor attenuated leptin-induced lung edema. The hyperoxia-induced release of proinflammatory cytokines was attenuated in db/db mice. Despite resistance to lung injury, db/db mice had diminished alveolar fluid clearance and reduced Na,K-ATPase function compared with wild-type mice. CONCLUSIONS These results indicate that leptin can induce and that resistance to leptin attenuates hyperoxia-induced lung injury and hyperoxia-induced inflammatory cytokines in the lung.
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Affiliation(s)
- Amy Bellmeyer
- Division of Pulmonary and Critical Care Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA
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Lee J, Reddy R, Barsky L, Weinberg K, Driscoll B. Contribution of proliferation and DNA damage repair to alveolar epithelial type 2 cell recovery from hyperoxia. Am J Physiol Lung Cell Mol Physiol 2005; 290:L685-L694. [PMID: 16299057 DOI: 10.1152/ajplung.00020.2005] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In this study, C57BL/6J mice were exposed to hyperoxia and allowed to recover in room air. The sublethal dose of hyperoxia for C57BL/6J was 48 h. Distal lung cellular isolates from treated animals were characterized as 98% epithelial, with minor fibroblast and endothelial cell contaminants. Cells were then verified as 95% pure alveolar epithelial type II cells (AEC2) by surfactant protein C (SP-C) expression. After hyperoxia exposure in vivo, fresh, uncultured AEC2 were analyzed for proliferation by cell yield, cell cycle, PCNA expression, and telomerase activity. DNA damage was assessed by TdT-dUTP nick-end labeling, whereas induction of DNA repair was evaluated by GADD-153 expression. A baseline level for proliferation and damage was observed in cells from control animals that did not alter significantly during acute hyperoxia exposure. However, a rise in these markers was observed 24 h into recovery. Over 72 h of recovery, markers for proliferation remained elevated, whereas those for DNA damage and repair peaked at 48 h and then returned back to baseline. The expression of GADD-153 followed a distinct course, rising significantly during acute exposure and peaking at 48 h recovery. These data demonstrate that in healthy, adult male C57BL/6J mice, AEC2 proliferation, damage, and repair follow separate courses during hyperoxia recovery and that both proliferation and efficient repair may be required to ensure AEC2 survival.
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Affiliation(s)
- Jooeun Lee
- Department of Surgery and Developmental Biology Program and Division of Research Immunology/Bone Marrow Transplant, The Saban Institute for Research, Childrens Hospital Los Angeles, Los Angeles, CA 90027, USA
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Marchand-Adam S, Plantier L, Bernuau D, Legrand A, Cohen M, Marchal J, Soler P, Lesèche G, Mal H, Aubier M, Dehoux M, Crestani B. Keratinocyte Growth Factor Expression by Fibroblasts in Pulmonary Fibrosis. Am J Respir Cell Mol Biol 2005; 32:470-7. [PMID: 15677771 DOI: 10.1165/rcmb.2004-0205oc] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Keratinocyte growth factor (KGF) is secreted by fibroblasts and protects from pulmonary fibrosis in animal models. Interleukin (IL)-1beta is the most potent inducer of KGF in fibroblasts, acting through the c-Jun pathway. We evaluated in vitro KGF production by human lung fibroblasts from patients with idiopathic pulmonary fibrosis (IPF, n = 10) and from control subjects (n = 7) at baseline and after IL-1beta stimulation. Basal KGF secretion by IPF fibroblasts was similar to controls. In fibroblasts from control subjects, IL-1beta increased c-Jun expression, c-Jun activation, and KGF secretion. SP600125, a specific c-Jun N-terminal kinase (JNK) inhibitor, inhibited the effect of IL-1beta. By contrast, in IPF fibroblasts, IL-1beta did not increase c-Jun expression and c-Jun activation, and weakly increased KGF secretion, whereas SP600125 had no effect. IL-1beta similarly increased JunB expression in fibroblasts from patients with IPF and control subjects. Total JNK content was not different in either unstimulated or IL-1beta-stimulated IPF and control fibroblasts. IL-1beta increased phosphorylated JNK in control and IPF fibroblasts, but this increase was weaker and heterogeneous in IPF. Altogether, our results demonstrate a dysregulation of KGF secretion by IPF fibroblasts. The weak response to IL-1beta is associated with a defect of c-Jun expression and activation and a defect of JNK activation.
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Affiliation(s)
- Sylvain Marchand-Adam
- Service de Pneumologie, Hôpital Bichat, 16 rue Henri Huchard, 75877 Paris cedex 18, France
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Roper JM, Gehen SC, Staversky RJ, Hollander MC, Fornace AJ, O'Reilly MA. Loss of Gadd45a does not modify the pulmonary response to oxidative stress. Am J Physiol Lung Cell Mol Physiol 2005; 288:L663-71. [PMID: 15653712 DOI: 10.1152/ajplung.00355.2004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
It is well established that exposure to high levels of oxygen (hyperoxia) injures and kills microvascular endothelial and alveolar type I epithelial cells. In contrast, significant death of airway and type II epithelial cells is not observed at mortality, suggesting that these cell types may express genes that protect against oxidative stress and damage. During a search for genes induced by hyperoxia, we previously reported that airway and alveolar type II epithelial cells uniquely express the growth arrest and DNA damage ( Gadd) 45a gene. Because Gadd45a has been implicated in protection against genotoxic stress, adult Gadd45a (+/+) and Gadd45a (−/−) mice were exposed to hyperoxia to investigate whether it protected epithelial cells against oxidative stress. During hyperoxia, Gadd45a deficiency did not affect loss of airway epithelial expression of Clara cell secretory protein or type II epithelial cell expression of pro-surfactant protein C. Likewise, Gadd45a deficiency did not alter recruitment of inflammatory cells, edema, or overall mortality. Consistent with Gadd45a not affecting the oxidative stress response, p21Cip1/WAF1and heme oxygenase-1 were comparably induced in Gadd45a (+/+) and Gadd45a (−/−) mice. Additionally, Gadd45a deficiency did not affect oxidative DNA damage or apoptosis as assessed by oxidized guanine and terminal deoxyneucleotidyl transferase-mediated dUTP nick-end labeling staining. Overexpression of Gadd45a in human lung adenocarcinoma cells did not affect viability or survival during exposure, whereas it was protective against UV-radiation. We conclude that increased tolerance of airway and type II epithelial cells to hyperoxia is not attributed solely to expression of Gadd45a.
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Affiliation(s)
- Jason M Roper
- Departments of Environmental Medicine, School of Medicine and Dentistry, University of Rochester, Rochester, NY 14642, USA
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Lee HS, Kim HJ, Moon CS, Chong YH, Kang JL. Inhibition of c-Jun NH2-terminal kinase or extracellular signal-regulated kinase improves lung injury. Respir Res 2004; 5:23. [PMID: 15566575 PMCID: PMC538282 DOI: 10.1186/1465-9921-5-23] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2004] [Accepted: 11/27/2004] [Indexed: 11/24/2022] Open
Abstract
Background Although in vitro studies have determined that the activation of mitogen-activated protein (MAP) kinases is crucial to the activation of transcription factors and regulation of the production of proinflammatory mediators, the roles of c-Jun NH2-terminal kinase (JNK) and extracellular signal-regulated kinase (ERK) in acute lung injury have not been elucidated. Methods Saline or lipopolysaccharide (LPS, 6 mg/kg of body weight) was administered intratracheally with a 1-hour pretreatment with SP600125 (a JNK inhibitor; 30 mg/kg, IO), or PD98059 (an MEK/ERK inhibitor; 30 mg/kg, IO). Rats were sacrificed 4 hours after LPS treatment. Results SP600125 or PD98059 inhibited LPS-induced phosphorylation of JNK and ERK, total protein and LDH activity in BAL fluid, and neutrophil influx into the lungs. In addition, these MAP kinase inhibitors substantially reduced LPS-induced production of inflammatory mediators, such as CINC, MMP-9, and nitric oxide. Inhibition of JNK correlated with suppression of NF-κB activation through downregulation of phosphorylation and degradation of IκB-α, while ERK inhibition only slightly influenced the NF-κB pathway. Conclusion JNK and ERK play pivotal roles in LPS-induced acute lung injury. Therefore, inhibition of JNK or ERK activity has potential as an effective therapeutic strategy in interventions of inflammatory cascade-associated lung injury.
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Affiliation(s)
- Hui Su Lee
- Department of Physiology, Division of Cell Biology, Ewha Medical Research Institute, Ewha Womans University College of Medicine, 911-1 Mok-6-dong, Yangcheon-ku, Seoul 158-056, Korea
| | - Hee Jae Kim
- Department of Physiology, Division of Cell Biology, Ewha Medical Research Institute, Ewha Womans University College of Medicine, 911-1 Mok-6-dong, Yangcheon-ku, Seoul 158-056, Korea
| | - Chang Sook Moon
- Department of Physiology, Division of Cell Biology, Ewha Medical Research Institute, Ewha Womans University College of Medicine, 911-1 Mok-6-dong, Yangcheon-ku, Seoul 158-056, Korea
| | - Young Hae Chong
- Department of Microbiology, Division of Cell Biology, Ewha Medical Research Institute, Ewha Womans University College of Medicine, 911-1 Mok-6-dong, Yangcheon-ku, Seoul 158-056, Korea
| | - Jihee Lee Kang
- Department of Physiology, Division of Cell Biology, Ewha Medical Research Institute, Ewha Womans University College of Medicine, 911-1 Mok-6-dong, Yangcheon-ku, Seoul 158-056, Korea
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Xia Y, Karin M. The control of cell motility and epithelial morphogenesis by Jun kinases. Trends Cell Biol 2004; 14:94-101. [PMID: 15102441 DOI: 10.1016/j.tcb.2003.12.005] [Citation(s) in RCA: 208] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Originally identified as stress-activated protein kinases that control cell survival and proliferation through transcription factor c-Jun, the Jun N-terminal kinase (JNK) subgroup of MAP kinases (MAPKs) have recently emerged as crucial regulators of cell migration and the morphogenetic movement of epithelial sheets. In Drosophila, a well-orchestrated JNK signaling pathway controls formation of actin stress fibers and cell shape changes, which are required for the sealing of embryonic epidermis in a process known as dorsal closure. The JNK pathway is also involved in morphogenetic processes in mice including closure of the eyelid, neural tube and optic fissure. This article focuses on recent advances in understanding the role of JNK pathway in the regulation of cell migration, cytoskeleton rearrangement and the morphogenesis of epithelial sheets.
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Affiliation(s)
- Ying Xia
- Center for Environmental Genetics and Department of Environmental Health, University of Cincinnati Medical Center, 123 East Shields Street, Cincinnati, OH 45267-0056, USA.
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Affiliation(s)
- Marc B Hershenson
- Departments of Pediatrics and Communicable Diseases, Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109-0212, USA.
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Li LF, Yu L, Quinn DA. Ventilation-induced Neutrophil Infiltration Depends on c-Jun N-Terminal Kinase. Am J Respir Crit Care Med 2004; 169:518-24. [PMID: 14644930 DOI: 10.1164/rccm.200305-660oc] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Positive pressure ventilation with large VTs has been shown to cause release of cytokines, including macrophage inflammatory protein-2 (MIP-2), a functional equivalent of human interleukin-8. The mechanisms regulating ventilation-induced cytokine production are unclear. Based on our previous in vitro model of lung cell stretch, we hypothesized that high VT ventilation-induced MIP-2 production is dependent on the activation of the c-Jun N-terminal kinase (JNK). We exposed C57BL/6 mice to high VT (30 ml/kg) or low VT (6 ml/kg) mechanical ventilation for 5 hours. High VT ventilation-induced neutrophil migration into the lung, MIP-2 protein production, MIP-2 messenger RNA expression, and JNK activation. Large VT ventilation of JNK knockout mice and pharmacologic JNK inhibition with SP600125 attenuated neutrophil sequestration and blocked MIP-2 messenger RNA expression and MIP-2 production. We conclude that lung cell stretch in vivo results in increased lung neutrophil sequestration and increased MIP-2 production, which was, at least in part, dependent upon the JNK pathway.
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Affiliation(s)
- Li-Fu Li
- Department of Medicine, Massachusetts General Hospital, Boston, MA 02114, USA
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Ahmad S, Ahmad A, Ghosh M, Leslie CC, White CW. Extracellular ATP-mediated signaling for survival in hyperoxia-induced oxidative stress. J Biol Chem 2004; 279:16317-25. [PMID: 14761947 DOI: 10.1074/jbc.m313890200] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Respiratory failure is a serious consequence of lung cell injury caused by treatment with high inhaled oxygen concentrations. Human lung microvascular endothelial cells (HLMVEC) are a principal target of hyperoxic injury (hyperoxia). Cell stress can cause release of ATP, and this extracellular nucleotide can activate purinoreceptors and mediate responses essential for survival. In this investigation, exposure of endothelial cells to an oxidative stress, hyperoxia, caused rapid but transient ATP release (20.03 +/- 2.00 nm/10(6) cells in 95% O(2) versus 0.08 +/- 0.01 nm/10(6) cells in 21% O2 at 30 min) into the extracellular milieu without a concomitant change in intracellular ATP. Endogenously produced extracellular ATP-enhanced mTOR-dependent uptake of glucose (3467 +/- 102 cpm/mg protein in 95% oxygen versus 2100 +/- 112 cpm/mg protein in control). Extracellular addition of ATP-activated important cell survival proteins like PI 3-kinase and extracellular-regulated kinase (ERK-1/2). These events were mediated primarily by P2Y receptors, specifically the P2Y2 and/or P2Y6 subclass of receptors. Extracellular ATP was required for the survival of HLMVEC in hyperoxia (55 +/- 10% surviving cells with extracellular ATP scavengers [apyrase + adenosine deaminase] versus 95 +/- 12% surviving cells without ATP scavengers at 4 d of hyperoxia). Incubation with ATP scavengers abolished ATP-dependent ERK phosphorylation stimulated by hyperoxia. Further, ERK activation also was found to be important for cell survival in hyperoxia, as treatment with PD98059 enhanced hyperoxia-mediated cell death. These findings demonstrate that ATP release and subsequent ATP-mediated signaling events are vital for survival of HLMVEC in hyperoxia.
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Affiliation(s)
- Shama Ahmad
- Department of Pediatrics, National Jewish Medical and Research Center, Denver, Colorado 80206, USA
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Idiopathic Pulmonary Fibrosis. Proceedings of the 1st Annual Pittsburgh International Lung Conference. October 2002. Am J Respir Cell Mol Biol 2003; 29:S1-105. [PMID: 12936907 DOI: 10.1165/rcmb.2003-0159su] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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Abstract
Administration of high concentrations of oxygen (hyperoxia) is a mainstay of supportive treatment for patients suffering from severe respiratory failure. However, hyperoxia, by generating excess systemic reactive oxygen species (ROS), can exacerbate organ failure by causing cellular injury. Therefore, a better understanding of the signal transduction pathways in hyperoxia may provide the basis for effective therapeutic interventions. The major biological effects of hyperoxia include cell death, induction of stress responses, inflammation, and modulation of cell growth. Major signaling pathways that appear to be involved include the mitogen-activated protein kinases (MAPKs), AP-1, and NF-kappa B, which converge, ultimately, to the expression of a range of stress response genes, cytokines, and growth factors.
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Affiliation(s)
- Patty J Lee
- Section of Pulmonary and Critical Care Medicine, Yale University School of Medicine, New Haven, CT, USA.
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