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Zhang XX, Wang HY, Yang XF, Lin ZQ, Shi N, Chen CJ, Yao LB, Yang XM, Guo J, Xia Q, Xue P. Alleviation of acute pancreatitis-associated lung injury by inhibiting the p38 mitogen-activated protein kinase pathway in pulmonary microvascular endothelial cells. World J Gastroenterol 2021; 27:2141-2159. [PMID: 34025070 PMCID: PMC8117735 DOI: 10.3748/wjg.v27.i18.2141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Revised: 02/06/2021] [Accepted: 03/29/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Previous reports have suggested that the p38 mitogen-activated protein kinase signaling pathway is involved in the development of severe acute pancreatitis (SAP)-related acute lung injury (ALI). Inhibition of p38 by SB203580 blocked the inflammatory responses in SAP-ALI. However, the precise mechanism associated with p38 is unclear, particularly in pulmonary microvascular endothelial cell (PMVEC) injury.
AIM To determine its role in the tumor necrosis factor-alpha (TNF-α)-induced inflammation and apoptosis of PMVECs in vitro. We then conducted in vivo experiments to confirm the effect of SB203580-mediated p38 inhibition on SAP-ALI.
METHODS In vitro, PMVEC were transfected with mitogen-activated protein kinase kinase 6 (Glu), which constitutively activates p38, and then stimulated with TNF-α. Flow cytometry and western blotting were performed to detect the cell apoptosis and inflammatory cytokine levels, respectively. In vivo, SAP-ALI was induced by 5% sodium taurocholate and three different doses of SB203580 (2.5, 5.0 or 10.0 mg/kg) were intraperitoneally injected prior to SAP induction. SAP-ALI was assessed by performing pulmonary histopathology assays, measuring myeloperoxidase activity, conducting arterial blood gas analyses and measuring TNF-α, interleukin (IL)-1β and IL-6 levels. Lung microvascular permeability was measured by determining bronchoalveolar lavage fluid protein concentration, Evans blue extravasation and ultrastructural changes in PMVECs. The apoptotic death of pulmonary cells was confirmed by performing a terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling analysis and examining the Bcl2, Bax, Bim and cle-caspase3 levels. The proteins levels of P-p38, NFκB, IκB, P-signal transducer and activator of transcription-3, nuclear factor erythroid 2-related factor 2, HO-1 and Myd88 were detected in the lungs to further evaluate the potential mechanism underlying the protective effect of SB203580.
RESULTS In vitro, mitogen-activated protein kinase (Glu) transfection resulted in higher apoptotic rates and cytokine (IL-1β and IL-6) levels in TNF-α-treated PMVECs. In vivo, SB2035080 attenuated lung histopathological injury, decreased inflammatory activity (TNF-α, IL-1β, IL-6 and myeloperoxidase) and preserved pulmonary function. Furthermore, SB203580 significantly reversed changes in the bronchoalveolar lavage fluid protein concentration, Evans blue accumulation, terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling-positive cell numbers, apoptosis-related proteins (cle-caspase3, Bim and Bax) and endothelial microstructure. Moreover, SB203580 significantly reduced the pulmonary P-p38, NFκB, P-signal transducer and activator of transcription-3 and Myd88 levels but increased the IκB and HO-1 levels.
CONCLUSION p38 inhibition may protect against SAP-ALI by alleviating inflammation and the apoptotic death of PMVECs.
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Affiliation(s)
- Xiao-Xin Zhang
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Hao-Yang Wang
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Xue-Fei Yang
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Zi-Qi Lin
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Na Shi
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Chan-Juan Chen
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Lin-Bo Yao
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Xin-Min Yang
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Jia Guo
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Qing Xia
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Ping Xue
- Department of Integrated Traditional Chinese and Western Medicine, West China Hospital of Sichuan University, Chengdu 610041, Sichuan Province, China
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Hazra B, Chakraborty S, Bhaskar M, Mukherjee S, Mahadevan A, Basu A. miR-301a Regulates Inflammatory Response to Japanese Encephalitis Virus Infection via Suppression of NKRF Activity. THE JOURNAL OF IMMUNOLOGY 2019; 203:2222-2238. [PMID: 31527198 DOI: 10.4049/jimmunol.1900003] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 08/20/2019] [Indexed: 12/15/2022]
Abstract
Microglia being the resident macrophage of brain provides neuroprotection following diverse microbial infections. Japanese encephalitis virus (JEV) invades the CNS, resulting in neuroinflammation, which turns the neuroprotective role of microglia detrimental as characterized by increased microglial activation and neuronal death. Several host factors, including microRNAs, play vital roles in regulating virus-induced inflammation. In the current study, we demonstrate that the expression of miR-301a is increased in JEV-infected microglial cells and human brain. Overexpression of miR-301a augments the JEV-induced inflammatory response, whereas inhibition of miR-301a completely reverses the effects. Mechanistically, NF-κB-repressing factor (NKRF) functioning as inhibitor of NF-κB activation is identified as a potential target of miR-301a in JEV infection. Consequently, miR-301a-mediated inhibition of NKRF enhances nuclear translocation of NF-κB, which, in turn, resulted in amplified inflammatory response. Conversely, NKRF overexpression in miR-301a-inhibited condition restores nuclear accumulation of NF-κB to a basal level. We also observed that JEV infection induces classical activation (M1) of microglia that drives the production of proinflammatory cytokines while suppressing alternative activation (M2) that could serve to dampen the inflammatory response. Furthermore, in vivo neutralization of miR-301a in mouse brain restores NKRF expression, thereby reducing inflammatory response, microglial activation, and neuronal apoptosis. Thus, our study suggests that the JEV-induced expression of miR-301a positively regulates inflammatory response by suppressing NKRF production, which might be targeted to manage viral-induced neuroinflammation.
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Affiliation(s)
- Bibhabasu Hazra
- National Brain Research Centre, Manesar, Haryana 122052, India; and
| | | | | | | | - Anita Mahadevan
- Department of Neuropathology, National Institute of Mental Health and Neurosciences, Bangalore 560029, India
| | - Anirban Basu
- National Brain Research Centre, Manesar, Haryana 122052, India; and
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Homoharringtonine deregulates MYC transcriptional expression by directly binding NF-κB repressing factor. Proc Natl Acad Sci U S A 2019; 116:2220-2225. [PMID: 30659143 DOI: 10.1073/pnas.1818539116] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Homoharringtonine (HHT), a known protein synthesis inhibitor, has an anti-myeloid leukemia effect and potentiates the therapeutic efficacy of anthracycline/cytarabine induction regimens for acute myelogenous leukemia (AML) with favorable and intermediate prognoses, especially in the t(8;21) subtype. Here we provide evidence showing that HHT inhibits the activity of leukemia-initiating cells (Lin-/Sca-1-/c-kit+; LICs) in a t(8;21) murine leukemia model and exerts a down-regulating effect on MYC pathway genes in human t(8;21) leukemia cells (Kasumi-1). We discovered that NF-κB repressing factor (NKRF) is bound directly by HHT via the second double-strand RNA-binding motif (DSRM2) domain, which is the nuclear localization signal of NKRF. A series of deletion and mutagenesis experiments mapped HHT direct binding sites to K479 and C480 amino acids in the DSRM2 domain. HHT treatment shifts NKRF from the nucleus (including nucleoli) to the cytoplasm by occupying the DSRM2 domain, strengthens the p65-NKRF interaction, and interferes with p65-p50 complex formation, thereby attenuating the transactivation activity of p65 on the MYC gene. Moreover, HHT significantly decreases the expression of KIT, a frequently mutated and/or highly expressed gene in t(8;21) AML, in concert with MYC down-regulation. Our work thus identifies a mechanism of action of HHT that is different from, but acts in concert with, the known mode of action of this compound. These results justify further clinical testing of HHT in AML.
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Involvement of heme oxygenase-1 induction in anti-vascular inflammation effects of Xanthoceras sorbifolia in human umbilical vein endothelial cells. J TRADIT CHIN MED 2018. [DOI: 10.1016/s0254-6272(18)30979-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Human NF-κB repressing factor acts as a stress-regulated switch for ribosomal RNA processing and nucleolar homeostasis surveillance. Proc Natl Acad Sci U S A 2017; 114:1045-1050. [PMID: 28096332 DOI: 10.1073/pnas.1616112114] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The nucleolus, a dynamic nuclear compartment long regarded as the cell ribosome factory, is emerging as an important player in the regulation of cell survival and recovery from stress. In larger eukaryotes, the stress-induced transcriptional response is mediated by a family of heat-shock transcription factors. Among these, HSF1, considered the master regulator of stress-induced transcriptional responses, controls the expression of cytoprotective heat shock proteins (HSPs), molecular chaperones/cochaperones constituting a major component of the cell protein quality control machinery essential to circumvent stress-induced degradation and aggregation of misfolded proteins. Herein we identify human NF-κB repressing factor (NKRF) as a nucleolar HSP essential for nucleolus homeostasis and cell survival under proteotoxic stress. NKRF acts as a thermosensor translocating from the nucleolus to the nucleoplasm during heat stress; nucleolar pools are replenished during recovery upon HSF1-mediated NKRF resynthesis. Silencing experiments demonstrate that NKRF is an unconventional HSP crucial for correct ribosomal RNA (rRNA) processing and preventing aberrant rRNA precursors and discarded fragment accumulation. These effects are mediated by NKRF interaction with the 5'-to-3' exoribonuclease XRN2, a key coordinator of multiple pre-rRNA cleavages, driving mature rRNA formation and discarded rRNA decay. Under stress conditions, NKRF directs XRN2 nucleolus/nucleoplasm trafficking, controlling 5'-to-3' exoribonuclease nucleolar levels and regulating rRNA processing. Our study reveals a different aspect of rRNA biogenesis control in human cells and sheds light on a sophisticated mechanism of nucleolar homeostasis surveillance during stress.
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Rother S, Bartels M, Schweda AT, Resch K, Pallua N, Nourbakhsh M. NF‐κB‐repressing factor phosphorylation regulates transcription elongation
via
its interactions with 5'→3' exoribonuclease 2 and negative elongation factor. FASEB J 2015; 30:174-85. [DOI: 10.1096/fj.15-270256] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 08/31/2015] [Indexed: 12/22/2022]
Affiliation(s)
- Sascha Rother
- Institute of Pharmacology, Hannover Medical SchoolHannoverGermany
| | - Myriam Bartels
- Institute of Pharmacology, Hannover Medical SchoolHannoverGermany
| | | | - Klaus Resch
- Institute of Pharmacology, Hannover Medical SchoolHannoverGermany
| | - Norbert Pallua
- Department of Plastic and Reconstructive Surgery, Hand Surgery and Burn CenterRheinisch‐Westfälische Technische Hochschule (RWTH) Aachen University HospitalAachenGermany
| | - Mahtab Nourbakhsh
- Department of Plastic and Reconstructive Surgery, Hand Surgery and Burn CenterRheinisch‐Westfälische Technische Hochschule (RWTH) Aachen University HospitalAachenGermany
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Park EJ, Park SW, Kim HJ, Kwak JH, Lee DU, Chang KC. Dehydrocostuslactone inhibits LPS-induced inflammation by p38MAPK-dependent induction of hemeoxygenase-1 in vitro and improves survival of mice in CLP-induced sepsis in vivo. Int Immunopharmacol 2014; 22:332-40. [PMID: 25066549 DOI: 10.1016/j.intimp.2014.07.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 06/30/2014] [Accepted: 07/10/2014] [Indexed: 01/18/2023]
Abstract
We investigated the hypothesis that the administration of dehydrocostuslactone (DL), a sesquiterpene lactone found in Saussurea lappa Clarke (Compositae), might reduce organ failure and increase survival in a cecal ligation and puncture (CLP)-induced mouse model of sepsis due to HO-1 induction. Treatment of RAW264.7 cells with DL increased HO-1 expression in a time- and concentration-dependent manner, and this up-regulation of HO-1 by DL was significantly inhibited by silencing either Nrf2 and p38 or treating cells with SB203580 (a p38MAPK inhibitor), but it was not inhibited in the presence of SP600125 (an ERK inhibitor), PD98059 (a JNK inhibitor), or LY294002 (PI3K inhibitor). As expected, DL concentration dependently inhibited the expressions of inducible nitric oxide synthase (iNOS) and cyclooxygenase (COX-2), and the productions of NO and PGE2 in LPS-activated cells, and these inhibitions were reversed by silencing HO-1. Most importantly, administration of DL significantly reduced mortality and reduced serum IL-1β and TNF-α and the infiltration of macrophages into liver tissues of CLP-mice. Inducible NOS expression in lung and liver tissues of CLP-mice was reduced by DL, which was reversed by the co-administration of zinc-protoporphyrin IX (ZnPPIX; a competitive inhibitor of HO-1). Our findings indicate that DL might be useful for the treatment of sepsis.
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Affiliation(s)
- Eun Jung Park
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-751, Republic of Korea
| | - Sang Won Park
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-751, Republic of Korea
| | - Hye Jung Kim
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-751, Republic of Korea
| | - Jong-Hwan Kwak
- School of Pharmacy, Sungkyunkwan University, Suwon 440-746, Republic of Korea
| | - Dong-Ung Lee
- Division of Bioscience, Dongguk University, Gyeongju 780-714, Republic of Korea.
| | - Ki Churl Chang
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-751, Republic of Korea.
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Li LF, Lai YT, Chang CH, Lin MC, Liu YY, Kao KC, Tsai YH. Neutrophil elastase inhibitor reduces ventilation-induced lung injury via nuclear factor-κB and NF-κB repressing factor in mice. Exp Biol Med (Maywood) 2014; 239:1045-1057. [PMID: 24728725 DOI: 10.1177/1535370214529393] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Mechanical ventilation used in patients with acute lung injury can damage pulmonary epithelial cells through production of inflammatory cytokines, oxygen radicals, and neutrophil infiltration, termed ventilator-induced lung injury. Neutrophil elastase, nuclear factor-κB (NF-κB), and NF-κB repressing factor (NRF) have previously been shown to participate in the regulation of macrophage inflammatory protein-2 (MIP-2) during airway inflammation. However, the mechanisms regulating interactions among mechanical ventilation, neutrophil influx, and NF-κB/NRF remain unclear. Thus, we hypothesized that neutrophil elastase inhibitor attenuated ventilation-induced neutrophil recruitment and MIP-2 production through inhibition of the NF-κB/NRF pathway. Male C57BL/6 mice were exposed to low-tidal-volume (6 mL/kg) or high-tidal-volume (30 mL/kg) mechanical ventilation using room air with or without 2 µg/g NF-κB inhibitor SN50 or 6 µg/g NRF short interfering RNA or 100 µg/g neutrophil elastase inhibitor administration. Nonventilated mice served as a control group. Evan blue dye, lung wet-to-dry weight ratio, free radicals, myeloperoxidase, histopathologic grading of lung tissue, inflammatory cytokines, Western blot of NF-κB and NRF, and gene expression of NRF were measured to establish the extent of lung injury. Neutrophil elastase inhibitor ameliorated high-tidal-volume ventilation-induced lung injury, neutrophil influx, production of MIP-2 and malondialdehyde, activation of NF-κB and NRF, apoptotic epithelial cell death, and disruption of bronchial microstructure in mice. Mechanical stretch-augmented acute lung injury was also attenuated through pharmacological inhibition of NF-κB activity by SN50 and NRF expression by NRF short interfering RNA. Our data suggest that neutrophil elastase inhibitor attenuates high-tidal-volume mechanical ventilation-induced neutrophil influx, oxidative stress, and production of MIP-2, at least partly, through inhibition of NF-κB/NRF pathway. Understanding the protective effects of neutrophil elastase inhibitor associated with the reduction of MIP-2 allow clarification of the pathophysiological mechanisms regulating severe lung inflammation and development of possible therapeutic strategies involved in acute lung injury.
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Affiliation(s)
- Li-Fu Li
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital and Chang Gung University, Taoyuan 333, Taiwan Department of Respiratory Therapy, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
| | - Yi-Ting Lai
- Department of Respiratory Therapy, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan Graduate Institute of Clinical Medical Sciences and Department of Respiratory Care, College of Medicine, Chang Gung University, Taoyuan 333, Taiwan
| | - Chih-Hao Chang
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital and Chang Gung University, Taoyuan 333, Taiwan
| | - Meng-Chih Lin
- Division of Pulmonary and Critical Care Medicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan
| | - Yung-Yang Liu
- Chest Department, Taipei Veterans General Hospital, Taipei 112, Taiwan Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei 112, Taiwan
| | - Kuo-Chin Kao
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital and Chang Gung University, Taoyuan 333, Taiwan Department of Respiratory Therapy, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
| | - Ying-Huang Tsai
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital and Chang Gung University, Taoyuan 333, Taiwan Department of Respiratory Therapy, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
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Liu YY, Li LF, Yang CT, Lu KH, Huang CC, Kao KC, Chiou SH. Suppressing NF-κB and NKRF Pathways by Induced Pluripotent Stem Cell Therapy in Mice with Ventilator-Induced Lung Injury. PLoS One 2013; 8:e66760. [PMID: 23840526 PMCID: PMC3694116 DOI: 10.1371/journal.pone.0066760] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 05/12/2013] [Indexed: 01/14/2023] Open
Abstract
Background High-tidal-volume mechanical ventilation used in patients with acute lung injury (ALI) can induce the release of inflammatory cytokines, as macrophage inflammatory protein-2 (MIP-2), recruitment of neutrophils, and disruption of alveolar epithelial and endothelial barriers. Induced pluripotent stem cells (iPSCs) have been shown to improve ALI in mice, but the mechanisms regulating the interactions between mechanical ventilation and iPSCs are not fully elucidated. Nuclear factor kappa B (NF-κB) and NF-κB repressing factor (NKRF) have been proposed to modulate the neutrophil activation involved in ALI. Thus, we hypothesized intravenous injection of iPSCs or iPSC-derived conditioned medium (iPSC-CM) would decrease high-tidal-volume ventilation-induced neutrophil infiltration, oxidative stress, and MIP-2 production through NF-κB/NKRF pathways. Methods Male C57BL/6 mice, aged between 6 and 8 weeks, weighing between 20 and 25 g, were exposed to high-tidal-volume (30 ml/kg) mechanical ventilation with room air for 1 to 4 h after 5×107 cells/kg mouse iPSCs or iPSC-CM administration. Nonventilated mice were used as control groups. Results High-tidal-volume mechanical ventilation induced the increases of integration of iPSCs into the injured lungs of mice, microvascular permeability, neutrophil infiltration, malondialdehyde, MIP-2 production, and NF-κB and NKRF activation. Lung injury indices including inflammation, lung edema, ultrastructure pathologic changes and functional gas exchange impairment induced by mechanical ventilation were attenuated with administration of iPSCs or iPSC-CM, which was mimicked by pharmacological inhibition of NF-κB activity with SN50 or NKRF expression with NKRF short interfering RNA. Conclusions Our data suggest that iPSC-based therapy attenuates high-tidal-volume mechanical ventilation-induced lung injury, at least partly, through inhibition of NF-κB/NKRF pathways. Notably, the conditioned medium of iPSCs revealed beneficial effects equal to those of iPSCs.
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Affiliation(s)
- Yung-Yang Liu
- Chest Department, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Li-Fu Li
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan
- Department of Medicine, Chang Gung University, Taoyuan, Taiwan
- Department of Respiratory Therapy, Chang Gung Memorial Hospital, Taoyuan, Taiwan
- * E-mail: (L-FL); (S-HC)
| | - Cheng-Ta Yang
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan
- Department of Medicine, Chang Gung University, Taoyuan, Taiwan
- Department of Respiratory Therapy, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Kai-Hsi Lu
- Graduate Institute of Basic Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
- Department of Medical Research and Education, Cheng-Hsin General Hospital, Taipei, Taiwan
| | - Chung-Chi Huang
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan
- Department of Medicine, Chang Gung University, Taoyuan, Taiwan
- Department of Respiratory Therapy, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Kuo-Chin Kao
- Department of Medicine, Division of Pulmonary and Critical Care Medicine, Chang Gung Memorial Hospital, Taoyuan, Taiwan
- Department of Medicine, Chang Gung University, Taoyuan, Taiwan
- Department of Respiratory Therapy, Chang Gung Memorial Hospital, Taoyuan, Taiwan
| | - Shih-Hwa Chiou
- Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei, Taiwan
- Department of Ophthalmology, Taipei Veterans General Hospital, Taipei, Taiwan
- Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan
- Institute of Pharmacology, School of Medicine, National Yang-Ming University, Taipei, Taiwan
- * E-mail: (L-FL); (S-HC)
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Park EJ, Kim YM, Park SW, Kim HJ, Lee JH, Lee DU, Chang KC. Induction of HO-1 through p38 MAPK/Nrf2 signaling pathway by ethanol extract of Inula helenium L. reduces inflammation in LPS-activated RAW 264.7 cells and CLP-induced septic mice. Food Chem Toxicol 2013; 55:386-95. [PMID: 23298677 DOI: 10.1016/j.fct.2012.12.027] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2012] [Revised: 12/11/2012] [Accepted: 12/19/2012] [Indexed: 12/29/2022]
Abstract
High mobility group box 1 (HMGB1) plays a crucial mediator in the pathogenesis of many inflammatory diseases. We recently proposed that heme oxygenase-1 (HO-1) negatively regulates HMGB1 in inflammatory conditions. We investigated whether ethanol extract of Inula helenium L. (EIH) activates p38 MAPK/Nrf2/HO-1 pathways in RAW264.7 cells and reduces inflammation in CLP-induced septic mice. EIH induced expression of HO-1 protein in a time- and concentration-dependent manner. EIH significantly diminished HO-1 expression in siNrf2 RNA-transfected cells. As expected, the inhibited expression of iNOS/NO, COX-2/PGE2, HMGB1 release by EIH in LPS-activated RAW264.7 cells was significantly reversed by siHO-1RNA transfection. Furthermore, EIH not only inhibited NF-κB luciferase activity, phosphorylation of IκBα in LPS-activated cells but also significantly suppressed expression of adhesion molecules (ICAM-1 and VCAM-1) in TNF-α activated human umbilical vein endothelial cells. The induction of HO-1 by EIH was inhibited by SB203580 but not by SP600125, PD98059, nor LY294002. Most importantly, administration of EIH significantly reduced not only increase in blood HMGB1, ALT, AST, BUN, creatinine levels but also decrease macrophage infiltrate in the liver of septic mice, which were reversed by ZnPPIX, a HO-1 inhibitor. We concluded that EIH has anti-inflammatory effect via the induction of p38 MAPK-dependent HO-1 signaling pathway.
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Affiliation(s)
- Eun Jung Park
- Department of Pharmacology, School of Medicine, Institute of Health Sciences, Gyeongsang National University, Jinju 660-290, Republic of Korea
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Gene expression profile of NFκB repressing factor (NKRF) knockdown cells by microarray analysis. BIOCHIP JOURNAL 2012. [DOI: 10.1007/s13206-012-6307-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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