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Vaccinia virus induces rapid necrosis in keratinocytes by a STAT3-dependent mechanism. PLoS One 2014; 9:e113690. [PMID: 25419841 PMCID: PMC4242661 DOI: 10.1371/journal.pone.0113690] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 10/27/2014] [Indexed: 11/19/2022] Open
Abstract
RATIONALE Humans with a dominant negative mutation in STAT3 are susceptible to severe skin infections, suggesting an essential role for STAT3 signaling in defense against cutaneous pathogens. METHODS To focus on innate antiviral defenses in keratinocytes, we used a standard model of cutaneous infection of severe combined immunodeficient mice with the current smallpox vaccine, ACAM-2000. In parallel, early events post-infection with the smallpox vaccine ACAM-2000 were investigated in cultured keratinocytes of human and mouse origin. RESULTS Mice treated topically with a STAT3 inhibitor (Stattic) developed larger vaccinia lesions with higher virus titers and died more rapidly than untreated controls. Cultured human and murine keratinocytes infected with ACAM-2000 underwent rapid necrosis, but when treated with Stattic or with inhibitors of RIP1 kinase or caspase-1, they survived longer, produced higher titers of virus, and showed reduced activation of type I interferon responses and inflammatory cytokines release. Treatment with inhibitors of RIP1 kinase and STAT3, but not caspase-1, also reduced the inflammatory response of keratinocytes to TLR ligands. Vaccinia growth properties in Vero cells, which are known to be defective in some antiviral responses, were unaffected by inhibition of RIP1K, caspase-1, or STAT3. CONCLUSIONS Our findings indicate that keratinocytes suppress the replication and spread of vaccinia virus by undergoing rapid programmed cell death, in a process requiring STAT3. These data offer a new framework for understanding susceptibility to skin infection in patients with STAT3 mutations. Interventions which promote prompt necroptosis/pyroptosis of infected keratinocytes may reduce risks associated with vaccination with live vaccinia virus.
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152
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Bai F, Ni B, Liu M, Feng Z, Xiong Q, Shao G. Mycoplasma hyopneumoniae-derived lipid-associated membrane proteins induce inflammation and apoptosis in porcine peripheral blood mononuclear cells in vitro. Vet Microbiol 2014; 175:58-67. [PMID: 25481242 DOI: 10.1016/j.vetmic.2014.11.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 10/16/2014] [Accepted: 11/07/2014] [Indexed: 01/07/2023]
Abstract
Mycoplasma hyopneumoniae is the causative agent of swine enzootic pneumonia (EP), a disease that causes considerable economic losss in swine industry. Lipid-associated membrane proteins (LAMPs) of mycoplasma play important roles in causing mycoplasma diseases. The present study explores the pathogenic mechanisms of M. hyopneumoniae LAMPs by elucidating their role in modulating the inflammation, apoptosis, and relevant signaling pathways of peripheral blood mononuclear cells (PBMCs) of pig. LAMP treatment inhibited the growth of PBMCs. Up-regulation of cytokines, such as IL-6 and IL-1β, as well as increased production of nitric oxide (NO) and superoxide anion were all detected in the supernatant of LAMPs-treated PBMCs. Furthermore, flow cytometric analysis using dual staining with annexin-V-FITC and propidium iodide (PI) showed that LAMPs of M. hyopneumoniae induced a time-dependent apoptosis in lymphocyts and monocytes from PBMCs, which was blocked by NOS inhibitor or antioxidant. In addition, LAMPs induced the phosphorylation of p38, the ratio of pro-apoptotic Bax protein to anti-apoptotic Bcl-2, activation of caspase-3 and caspase-8, and poly ADP-ribose polymerase (PARP) cleavage in PBMCs. These findings demonstrated that M. hyopneumoniae LAMPs induced the production of proinflammatory cytokines, NO and reactive oxygen species (ROS), and apoptosis of PBMCs in vitro through p38 MAPK and Bax/Bcl-2 signaling pathways, as well as caspase activation.
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Affiliation(s)
- Fangfang Bai
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Bo Ni
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Maojun Liu
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Zhixin Feng
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Qiyan Xiong
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China
| | - Guoqing Shao
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Key Laboratory of Veterinary Biological Engineering and Technology, Ministry of Agriculture, National Center for Engineering Research of Veterinary Bio-products, Nanjing 210014, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009, China.
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153
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O'Sullivan KE, Reynolds JV, O'Hanlon C, O'Sullivan JN, Lysaght J. Could signal transducer and activator of transcription 3 be a therapeutic target in obesity-related gastrointestinal malignancy? J Gastrointest Cancer 2014; 45:1-11. [PMID: 24163144 DOI: 10.1007/s12029-013-9555-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
INTRODUCTION A large body of evidence has implicated the signal transducer and activator of transcription (STAT) family and particularly the ubiquitously expressed STAT3 protein in the pathogenesis of colorectal, hepatocellular, gastric and pancreatic carcinoma. DISCUSSION Concomitantly, an increasing body of epidemiological evidence has linked obesity and its associated pro-inflammatory state with the development of gastrointestinal cancers. Visceral adipose tissue is no longer considered inert and is known to secrete a number of adipocytokines such as leptin, interleukin (IL)-6, IL-8, IL-1β and tumour necrosis factor-alpha (TNF-α) into the surrounding environment. Interestingly, these adipocytokines are strongly linked with the Janus kinase (JAK)/STAT pathway of signal transduction and there is experimental evidence linking IL-1β, IL-8 and TNF-α to JAK/STAT signaling in other tissues. The result is an up-regulation of a wide range of anti-apoptotic, pro-metastatic and pro-angiogenic genes and processes. This is particularly relevant for gastrointestinal malignancy as these factors have the potential to signal adjacent endothelial cells in a paracrine manner. CONCLUSION This review examines the potential role of the STAT3 signaling pathway in the pathogenesis of obesity-related gastrointestinal malignancy and the potential therapeutic role of STAT3 blockade given its status as a signaling hub for a number of inflammatory adipocytokines.
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Affiliation(s)
- Katie E O'Sullivan
- Department of Surgery, Institute of Molecular Medicine, St. James Hospital, Dublin 8, Ireland,
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154
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Deng XS, Meng X, Zeng Q, Fullerton D, Mitchell M, Jaggers J. Adult aortic valve interstitial cells have greater responses to toll-like receptor 4 stimulation. Ann Thorac Surg 2014; 99:62-71. [PMID: 25442996 DOI: 10.1016/j.athoracsur.2014.07.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 07/07/2014] [Accepted: 07/09/2014] [Indexed: 01/08/2023]
Abstract
BACKGROUND Aortic valve interstitial cells (AVICs) have been implicated in the pathogenesis of calcific aortic valve disease. Signal transducer and activator of transcription 3 (Stat3) possesses antiinflammatory effects. Given that calcification occurs in adult valves, we hypothesized that AVICs from adult valves more likely undergo a proosteogenic phenotypic change than those from pediatric valves and that may be related to different Stat3 activation in the response of those two age groups to toll-like receptor 4 (TLR4). METHODS AVICs from healthy human aortic valve tissues were treated with TLR4 agonist lipopolysaccharide. Cellular levels of TLR4, intercellular adhesion molecule 1, bone morphogenetic protein 2, and alkaline phosphatase, as well as phosphorylation of p-38 mitogen-activated protein kinase (MAPK), nuclear factor-κβ (NF-κβ), and Stat3, were analyzed. RESULTS Toll-like receptor 4 protein levels were comparable between adult and pediatric AVICs. Adult cells produce markedly higher levels of the above markers after TLR4 stimulation, which is negatively associated with phosphorylation of Stat3. Inhibition of Stat3 enhanced p-38 MAPK and NF-κβ phosphorylation and exaggerated the expression of the above markers in pediatric AVICs after TLR4 stimulation. CONCLUSIONS Adult AVICs exhibit greater inflammatory and osteogenic responses to TLR4 stimulation. The enhanced responses in adult AVICs are at least partly due to lower levels of Stat3 activation in response to TLR4 stimulation relative to pediatric cells. Stat3 functions as a negative regulator of the TLR4 responses in human AVICs. The results suggest that Stat3 activation (tyrosine phosphorylation) may be protective and that TLR4 inhibition could be targeted pharmacologically to treat calcific aortic valve disease.
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Affiliation(s)
- Xin-Sheng Deng
- Cardiothoracic Surgery, University of Colorado, Children's Hospital Colorado, Aurora, Colorado; Cardiothoracic Surgery, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Xianzhong Meng
- Cardiothoracic Surgery, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - QingChun Zeng
- Cardiothoracic Surgery, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - David Fullerton
- Cardiothoracic Surgery, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Max Mitchell
- Cardiothoracic Surgery, University of Colorado, Children's Hospital Colorado, Aurora, Colorado
| | - James Jaggers
- Cardiothoracic Surgery, University of Colorado, Children's Hospital Colorado, Aurora, Colorado; Cardiothoracic Surgery, University of Colorado Anschutz Medical Campus, Aurora, Colorado.
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155
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Wilson T, Omelchenko I, Foster S, Zhang Y, Shi X, Nuttall AL. JAK2/STAT3 inhibition attenuates noise-induced hearing loss. PLoS One 2014; 9:e108276. [PMID: 25275304 PMCID: PMC4183445 DOI: 10.1371/journal.pone.0108276] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Accepted: 08/27/2014] [Indexed: 02/07/2023] Open
Abstract
Signal transducers and activators of transcription 3 (STAT3) is a stress responsive transcription factor that plays a key role in oxidative stress-mediated tissue injury. As reactive oxygen species (ROS) are a known source of damage to tissues of the inner ear following loud sound exposure, we examined the role of the Janus kinase 2 (JAK2)/STAT3 signaling pathway in noise induce hearing loss using the pathway specific inhibitor, JSI-124. Mice were exposed to a moderately damaging level of loud sound revealing the phosphorylation of STAT3 tyrosine 705 residues and nuclear localization in many cell types in the inner ear including the marginal cells of the stria vascularis, type II, III, and IV fibrocytes, spiral ganglion cells, and in the inner hair cells. Treatment of the mice with the JAK2/STAT3 inhibitor before noise exposure reduced levels of phosphorylated STAT3 Y705. We performed auditory brain stem response and distortion product otoacoustic emission measurements and found increased recovery of hearing sensitivity at two weeks after noise exposure with JAK2/STAT3 inhibition. Performance of cytocochleograms revealed improved outer hair cell survival in JSI-124 treated mice relative to control. Finally, JAK2/STAT3 inhibition reduced levels of ROS detected in outer hair cells at two hours post noise exposure. Together, these findings demonstrate that inhibiting the JAK2/STAT3 signaling pathway is protective against noise-induced cochlear tissue damage and loss of hearing sensitivity.
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MESH Headings
- Animals
- Cochlea/metabolism
- Cochlea/pathology
- Cochlea/physiopathology
- Epithelium/metabolism
- Evoked Potentials, Auditory, Brain Stem
- Gene Expression Regulation
- Hair Cells, Auditory/metabolism
- Hair Cells, Auditory/pathology
- Hearing Loss, Noise-Induced/metabolism
- Hearing Loss, Noise-Induced/pathology
- Hearing Loss, Noise-Induced/physiopathology
- Inflammation Mediators/metabolism
- Janus Kinase 2/antagonists & inhibitors
- Janus Kinase 2/metabolism
- Male
- Mice
- Otoacoustic Emissions, Spontaneous
- Phosphorylation
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Reactive Oxygen Species/metabolism
- STAT3 Transcription Factor/antagonists & inhibitors
- STAT3 Transcription Factor/metabolism
- Signal Transduction
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Affiliation(s)
- Teresa Wilson
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
| | - Irina Omelchenko
- Virginia Merrill Bloedel Hearing Research Center, University of Washington, Seattle, Washington, United States of America
| | - Sarah Foster
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
| | - Yuan Zhang
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
| | - Xiaorui Shi
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
| | - Alfred L. Nuttall
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
- Kresge Hearing Research Institute, The University of Michigan, Ann Arbor, Michigan, United States of America
- * E-mail:
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156
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Piperine inhibits IL-1β-induced IL-6 expression by suppressing p38 MAPK and STAT3 activation in gastric cancer cells. Mol Cell Biochem 2014; 398:147-56. [DOI: 10.1007/s11010-014-2214-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Accepted: 09/12/2014] [Indexed: 12/21/2022]
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157
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Cho YC, Lee IS, Seo H, Ju A, Youn D, Kim Y, Choun J, Cho S. Methanol extracts of Euphorbia cooperi inhibit the production of inflammatory mediators by inhibiting the activation of c‑Jun N‑terminal kinase and p38 in murine macrophages. Mol Med Rep 2014; 10:2663-8. [PMID: 25216192 DOI: 10.3892/mmr.2014.2560] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Accepted: 07/22/2014] [Indexed: 11/05/2022] Open
Abstract
Numerous Euphorbiaceae plants have been used for the treatment of diseases, including liver diseases, asthma and rheumatism. The present study evaluated the effect of methanol extracts from Euphorbia cooperi (MEC), a member of the Euphorbiaceae plant family, on the production of inflammatory cytokines interleukin (IL)‑6 and tumor necrosis factor (TNF)‑α, nitric oxide (NO) as well as the activation of mitogen‑activated protein kinase and nuclear factor (NF)‑κB signaling. Non‑cytotoxic concentrations of MEC significantly reduced the production of NO and IL‑6, but not TNF‑α, in lipopolysaccharide (LPS)‑stimulated RAW 264.7 macrophages. The decreased production of NO by MEC was due to alleviated expression of inducible NO synthase. Reporter assays with cells treated with MEC demonstrated reduced activator protein‑1 (AP-1) activity, while NF‑κB activity was not reduced. Furthermore, the phosphorylation levels of c‑Jun N‑terminal kinase (JNK) and p38 were suppressed by MEC while phosphorylation levels of inhibitor of κB were not reduced by MEC, suggesting that MEC‑mediated inactivation of JNK and p38 is the underlying regulatory mechanism for inflammatory mediators in LPS‑stimulated RAW 264.7 macrophages.
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Affiliation(s)
- Young-Chang Cho
- College of Pharmacy, Chung‑Ang University, Seoul 156-756, Republic of Korea
| | - In-Seon Lee
- College of Pharmacy, Chung‑Ang University, Seoul 156-756, Republic of Korea
| | - Huiyun Seo
- College of Pharmacy, Chung‑Ang University, Seoul 156-756, Republic of Korea
| | - Anna Ju
- College of Pharmacy, Chung‑Ang University, Seoul 156-756, Republic of Korea
| | - Deokkyu Youn
- College of Pharmacy, Chung‑Ang University, Seoul 156-756, Republic of Korea
| | - Younghyun Kim
- College of Pharmacy, Chung‑Ang University, Seoul 156-756, Republic of Korea
| | - Jaehee Choun
- College of Pharmacy, Chung‑Ang University, Seoul 156-756, Republic of Korea
| | - Sayeon Cho
- College of Pharmacy, Chung‑Ang University, Seoul 156-756, Republic of Korea
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158
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Guo D, Li JR, Wang Y, Lei LS, Yu CL, Chen NN. Cyclovirobuxinum D suppresses lipopolysaccharide-induced inflammatory responses in murine macrophages in vitro by blocking JAK-STAT signaling pathway. Acta Pharmacol Sin 2014; 35:770-8. [PMID: 24747164 PMCID: PMC4086391 DOI: 10.1038/aps.2014.16] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Accepted: 02/20/2014] [Indexed: 12/13/2022] Open
Abstract
AIM Cyclovirobuxinum D (CVB-D), an alkaloid isolated from the Chinese medicinal plant Buxus microphylla, has been found to be effective to treat cardiac insufficiency, arrhythmias and coronary heart disease. In the present study, we investigated the effects of CVB-D on the inflammatory responses in lipopolysaccharide (LPS)-stimulated murine macrophages in vitro and the underlying mechanisms. METHODS Murine macrophage cell line RAW264.7 cells were incubated in the presence of LPS (0.1 μg/mL) for 24 h. The cell viability was measured using MTT assay. The release of NO and cytokines were detected using the Griess test and ELISA, respectively. The mRNA and protein levels were determined using RT-PCR and Western blot, respectively. Reporter gene assays were used to analyze the transcriptional activity of NF-κB. RESULTS Treatment of RAW264.7 cells with CVB-D (25-300 μmol/L) did not affect the cell viability. Pretreatment with CVB-D (50, 100 and 200 μmol/L) concentration-dependently decreased NO release and iNOS expression in LPS-treated RAW264.7 cells (its IC50 value in inhibition of NO production was 144 μmol/L). CVB-D also concentration-dependently inhibited the secretion and mRNA expression of IL-1β and IL-6 in LPS-treated RAW264.7 cells. Furthermore, CVB-D remarkably inhibited the phosphorylation of STAT1 and STAT3, as well as JAK2 in LPS-treated RAW264.7 cells, but did not affect the activation of NF-κB and MAPKs pathways. Pretreatment with the JAK2 specific inhibitor AG490 (30 μmol/L) produced similar effects on NO release and iNOS expression in LPS-treated RAW264.7 cells. CONCLUSION CVB-D exerts anti-inflammatory effects in LPS-stimulated murine macrophages in vitro at least in part by blocking the JAK-STAT signaling pathway. The anti-inflammatory actions of CVB-D may contribute to its cardioprotection.
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Affiliation(s)
- Dan Guo
- Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
| | - Jing-rong Li
- School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
| | - Ying Wang
- China National Center for Biotechnology Development, Beijing 100039, China
| | - Lin-sheng Lei
- School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
| | - Chuan-lin Yu
- School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
| | - Na-na Chen
- School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
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159
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Hradetzky S, Roesner LM, Balaji H, Heratizadeh A, Mittermann I, Valenta R, Werfel T. Cytokine effects induced by the human autoallergen α-NAC. J Invest Dermatol 2014; 134:1570-1578. [PMID: 24441101 DOI: 10.1038/jid.2014.25] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 12/03/2013] [Accepted: 12/16/2013] [Indexed: 12/20/2022]
Abstract
Autoallergy is a phenomenon found in a subgroup of patients with atopic dermatitis (AD). These patients exhibit serum IgE reactivity toward autoantigens like the alpha-chain of the nascent polypeptide-associated complex (α-NAC; Hom s 2). α-NAC has been shown before to induce T-cell proliferation and secretion of IFN-γ. To elucidate the immune modulating functions α-NAC may exert, we analyzed its effects on cytokine transcription and secretion in peripheral blood mononuclear cells (PBMCs), monocytes, and CD4+ T cells. Transcription and secretion of IFN-γ, IL-17, and IL-22 were increased in α-NAC-stimulated PBMCs. As IL-17 was significantly upregulated by α-NAC, we assessed signal transduction in PBMCs and found signal transducer and activator of transcription 3 phosphorylation in α-NAC-stimulated cells. Furthermore, we could show the importance of monocyte activation by α-NAC, as isolated T cells reacted only weakly toward the stimulation. Inhibition of IL-23 p19 led to lower amounts of IL-17 in the PBMC supernatants after α-NAC stimulation. α-NAC stimulation of PBMCs from non-allergic donors resulted in secretion of IL-10, which was greatly reduced in PBMCs from α-NAC-sensitized AD patients. Our findings provide insights into the mechanisms of autoallergy, investigating the interplay of immune cells, signaling events, and cytokines, which are known to be relevant in atopic skin inflammation.
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Affiliation(s)
- Susanne Hradetzky
- Division of Immunodermatology and Allergy Research, Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany.
| | - Lennart M Roesner
- Division of Immunodermatology and Allergy Research, Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany
| | - Hari Balaji
- Division of Immunodermatology and Allergy Research, Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany
| | - Annice Heratizadeh
- Division of Immunodermatology and Allergy Research, Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany
| | - Irene Mittermann
- Division of Immunopathology, Department of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Rudolf Valenta
- Division of Immunopathology, Department of Pathophysiology and Allergy Research, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Thomas Werfel
- Division of Immunodermatology and Allergy Research, Department of Dermatology and Allergy, Hannover Medical School, Hannover, Germany
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160
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Wang ZF, Li Q, Liu SB, Mi WL, Hu S, Zhao J, Tian Y, Mao-Ying QL, Jiang JW, Ma HJ, Wang YQ, Wu GC. Aspirin-triggered Lipoxin A4 attenuates mechanical allodynia in association with inhibiting spinal JAK2/STAT3 signaling in neuropathic pain in rats. Neuroscience 2014; 273:65-78. [PMID: 24836854 DOI: 10.1016/j.neuroscience.2014.04.052] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2013] [Revised: 04/21/2014] [Accepted: 04/21/2014] [Indexed: 12/13/2022]
Abstract
Aspirin-triggered Lipoxin A4 (ATL), as a Lipoxin A4 (LXA4) epimer, is endogenously produced by aspirin-acetylated cycloxygenase-2 (COX-2) and plays a vital role in endogenous anti-inflammation via the LXA4 receptor (ALX). Recent investigations have indicated that spinal neuroinflammation and the activation of the Janus Kinase 2 (JAK2)/Signal Transducers and Transcription Activators 3 (STAT3) signaling pathway are involved in neuropathic pain states. However, the effect of ATL on neuroinflammation and JAK2/STAT3 signaling in chronic constriction injury (CCI)-induced neuropathic pain in rats has not been well-studied. The present study demonstrated the anti-inflammatory and analgesic effect of ATL on neuropathic pain and assessed the role of spinal JAK2/STAT3 signaling on the effect of ATL. Intrathecal administration of ATL significantly attenuated mechanical allodynia via spinal ALX and inhibited the upregulation of pro-inflammatory cytokines (IL-1β, IL-6, and TNF-α) on day 7 of CCI surgery. In addition, ATL markedly suppressed the upregulation of p-STAT3 induced by the neuropathic pain. Blockade of JAK2-STAT3 signaling with intrathecal administration of the JAK2 inhibitor AG490 or the STAT3 inhibitor S3I-201 clearly reduced mechanical allodynia and the upregulation of pro-inflammatory cytokines in CCI rats. Interestingly, inhibition of JAK2/STAT3 signaling via ATL or the specific signaling inhibitor (AG49, S3I-201) further promoted the increased expression of suppressor of cytokine signaling 3 (SOCS3) mRNA in the spinal cord induced by CCI surgery. Taken together, our results suggested that the analgesic effect of ATL was mediated by inhibiting spinal JAK2/STAT3 signaling and hence the spinal neuroinflammation in CCI rats.
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Affiliation(s)
- Z F Wang
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China; Department of Anatomy, Integrative Medicine College, Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian Province, China.
| | - Q Li
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - S B Liu
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - W-L Mi
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - S Hu
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - J Zhao
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - Y Tian
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - Q L Mao-Ying
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - J W Jiang
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - H J Ma
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - Y Q Wang
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
| | - G C Wu
- Department of Integrative Medicine and Neurobiology, Institute of Acupuncture Research, School of Basic Medical Sciences, Fudan University, Shanghai, China; State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Fudan University, Shanghai, China.
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161
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Effect of azithromycin on Prevotella intermedia lipopolysaccharide-induced production of interleukin-6 in murine macrophages. Eur J Pharmacol 2014; 729:10-6. [DOI: 10.1016/j.ejphar.2014.02.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 01/27/2014] [Accepted: 02/07/2014] [Indexed: 12/30/2022]
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162
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Wang H, Kumar A, Lamont RJ, Scott DA. GSK3β and the control of infectious bacterial diseases. Trends Microbiol 2014; 22:208-17. [PMID: 24618402 DOI: 10.1016/j.tim.2014.01.009] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 01/24/2014] [Accepted: 01/30/2014] [Indexed: 12/12/2022]
Abstract
Glycogen synthase kinase 3β (GSK3β) has been shown to be a crucial mediator of the intensity and direction of the innate immune system response to bacterial stimuli. This review focuses on: (i) the central role of GSK3β in the regulation of pathogen-induced inflammatory responses through the regulation of pro- and anti-inflammatory cytokine production, (ii) the extensive ongoing efforts to exploit GSK3β for its therapeutic potential in the control of infectious diseases, and (iii) the increasing evidence that specific pathogens target GSK3β-related pathways for immune evasion. A better understanding of complex bacteria-GSK3β interactions is likely to lead to more effective anti-inflammatory interventions and novel targets to circumvent pathogen colonization and survival.
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Affiliation(s)
- Huizhi Wang
- Oral Health and Systemic Disease, University of Louisville, Louisville, KY 40292, USA
| | - Akhilesh Kumar
- Oral Health and Systemic Disease, University of Louisville, Louisville, KY 40292, USA
| | - Richard J Lamont
- Oral Health and Systemic Disease, University of Louisville, Louisville, KY 40292, USA; Microbiology and Immunology, University of Louisville, Louisville, KY 40292, USA
| | - David A Scott
- Oral Health and Systemic Disease, University of Louisville, Louisville, KY 40292, USA; Microbiology and Immunology, University of Louisville, Louisville, KY 40292, USA.
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Siveen KS, Sikka S, Surana R, Dai X, Zhang J, Kumar AP, Tan BKH, Sethi G, Bishayee A. Targeting the STAT3 signaling pathway in cancer: role of synthetic and natural inhibitors. Biochim Biophys Acta Rev Cancer 2014; 1845:136-54. [PMID: 24388873 DOI: 10.1016/j.bbcan.2013.12.005] [Citation(s) in RCA: 358] [Impact Index Per Article: 35.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 12/24/2013] [Accepted: 12/27/2013] [Indexed: 12/25/2022]
Abstract
Signal transducers and activators of transcription (STATs) comprise a family of cytoplasmic transcription factors that mediate intracellular signaling that is usually generated at cell surface receptors and thereby transmit it to the nucleus. Numerous studies have demonstrated constitutive activation of STAT3 in a wide variety of human tumors, including hematological malignancies (leukemias, lymphomas, and multiple myeloma) as well as diverse solid tumors (such as head and neck, breast, lung, gastric, hepatocellular, colorectal and prostate cancers). There is strong evidence to suggest that aberrant STAT3 signaling promotes initiation and progression of human cancers by either inhibiting apoptosis or inducing cell proliferation, angiogenesis, invasion, and metastasis. Suppression of STAT3 activation results in the induction of apoptosis in tumor cells, and accordingly its pharmacological modulation by tyrosine kinase inhibitors, antisense oligonucleotides, decoy nucleotides, dominant negative proteins, RNA interference and chemopreventive agents have been employed to suppress the proliferation of various human cancer cells in culture and tumorigenicity in vivo. However, the identification and development of novel drugs that can target deregulated STAT3 activation effectively remains an important scientific and clinical challenge. This review presents the evidence for critical roles of STAT3 in oncogenesis and discusses the potential for development of novel cancer therapies based on mechanistic understanding of STAT3 signaling cascade.
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Affiliation(s)
| | - Sakshi Sikka
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Cancer Science Institute of Singapore, National University of Singapore, Centre for Translational Medicine, Singapore
| | - Rohit Surana
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Cancer Science Institute of Singapore, National University of Singapore, Centre for Translational Medicine, Singapore
| | - Xiaoyun Dai
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Jingwen Zhang
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Alan Prem Kumar
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Cancer Science Institute of Singapore, National University of Singapore, Centre for Translational Medicine, Singapore; School of Biomedical Sciences, Faculty of Health Sciences, Curtin University, Western Australia, Australia; Department of Biological Sciences, University of North Texas, Denton, TX, USA
| | - Benny K H Tan
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore
| | - Gautam Sethi
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Cancer Science Institute of Singapore, National University of Singapore, Centre for Translational Medicine, Singapore.
| | - Anupam Bishayee
- Department of Pharmaceutical Sciences, School of Pharmacy, American University of Health Sciences, Signal Hill, CA, USA.
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Brim H, Yooseph S, Zoetendal EG, Lee E, Torralbo M, Laiyemo AO, Shokrani B, Nelson K, Ashktorab H. Microbiome analysis of stool samples from African Americans with colon polyps. PLoS One 2013; 8:e81352. [PMID: 24376500 PMCID: PMC3869648 DOI: 10.1371/journal.pone.0081352] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 10/11/2013] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Colonic polyps are common tumors occurring in ~50% of Western populations with ~10% risk of malignant progression. Dietary agents have been considered the primary environmental exposure to promote colorectal cancer (CRC) development. However, the colonic mucosa is permanently in contact with the microbiota and its metabolic products including toxins that also have the potential to trigger oncogenic transformation. AIM To analyze fecal DNA for microbiota composition and functional potential in African Americans with pre-neoplastic lesions. MATERIALS & METHODS We analyzed the bacterial composition of stool samples from 6 healthy individuals and 6 patients with colon polyps using 16S ribosomal RNA-based phylogenetic microarray; the Human intestinal Tract Chip (HITChip) and 16S rRNA gene barcoded 454 pyrosequencing. The functional potential was determined by sequence-based metagenomics using 454 pyrosequencing. RESULTS Fecal microbiota profiling of samples from the healthy and polyp patients using both a phylogenetic microarraying (HITChip) and barcoded 454 pyrosequencing generated similar results. A distinction between both sets of samples was only obtained when the analysis was performed at the sub-genus level. Most of the species leading to the dissociation were from the Bacteroides group. The metagenomic analysis did not reveal major differences in bacterial gene prevalence/abundances between the two groups even when the analysis and comparisons were restricted to available Bacteroides genomes. CONCLUSION This study reveals that at the pre-neoplastic stages, there is a trend showing microbiota changes between healthy and colon polyp patients at the sub-genus level. These differences were not reflected at the genome/functions levels. Bacteria and associated functions within the Bacteroides group need to be further analyzed and dissected to pinpoint potential actors in the early colon oncogenic transformation in a large sample size.
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Affiliation(s)
- Hassan Brim
- Department of Pathology, Department of Medicine and Cancer Center, Howard University, College of Medicine, Washington, District of Columbia, United States of America
- * E-mail:
| | - Shibu Yooseph
- JCVI, San Diego, California, United States of America
| | - Erwin G. Zoetendal
- Laboratory of Microbiology, Wageningen University, Wageningen, The Netherlands
| | - Edward Lee
- Department of Pathology, Department of Medicine and Cancer Center, Howard University, College of Medicine, Washington, District of Columbia, United States of America
| | | | - Adeyinka O. Laiyemo
- Department of Pathology, Department of Medicine and Cancer Center, Howard University, College of Medicine, Washington, District of Columbia, United States of America
| | - Babak Shokrani
- Department of Pathology, Department of Medicine and Cancer Center, Howard University, College of Medicine, Washington, District of Columbia, United States of America
| | - Karen Nelson
- JCVI, Rockville, Maryland, United States of America
| | - Hassan Ashktorab
- Department of Pathology, Department of Medicine and Cancer Center, Howard University, College of Medicine, Washington, District of Columbia, United States of America
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Shim DW, Han JW, Sun X, Jang CH, Koppula S, Kim TJ, Kang TB, Lee KH. Lysimachia clethroides Duby extract attenuates inflammatory response in Raw 264.7 macrophages stimulated with lipopolysaccharide and in acute lung injury mouse model. JOURNAL OF ETHNOPHARMACOLOGY 2013; 150:1007-1015. [PMID: 24145006 DOI: 10.1016/j.jep.2013.09.056] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Revised: 09/13/2013] [Accepted: 09/24/2013] [Indexed: 06/02/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Lysimachia clethroides Duby (LC) is a traditional medicinal herb used to treat edema, hepatitis and inflammatory diseases in China and other Asian countries. In this study, the anti-inflammatory effects of LC extract and the mechanisms underlying were explored in both in vitro cell lines and acute lung injury (ALI) animal model of inflammation in vivo. MATERIALS AND METHODS Lipopolysaccharide (LPS)-stimulated Raw 264.7 murine macrophages were used to study the regulatory effects of LC extract on inflammatory mediators such as nitric oxide (NO) and proinflammatory cytokine expression. Western blotting or ELISA techniques were employed to estimate protein levels. RT-PCR was used for analyzing the interferon (IFN)-β production. LPS-induced ALI mouse model in vivo was employed to study the effect of LC extract. Further high-performance liquid chromatography (HPLC) fingerprinting technique was used to evaluate the active constituents present in LC extract, compared with reference standards. RESULTS Pre-treatment with LC extract inhibited the LPS-stimulated NO release, interleukin (IL)-1β and IL-6 production in Raw 264.7 cells dose dependently. LC extract inhibited the LPS-stimulated IRF3 and STAT1 phosphorylation. Further, in vivo experiments revealed that LC extract suppressed the infiltration of immune cells into the lung and proinflammatory cytokine production in broncho-alveolar lavage fluid (BALF) in the LPS-induced ALI mouse model. CONCLUSIONS Our results indicate that LC extract attenuates LPS-stimulated inflammatory responses in macrophages via regulating the key inflammatory mechanisms, providing a scientific support for its traditional use in treating various inflammatory diseases.
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Affiliation(s)
- Do-Wan Shim
- Department of Biotechnology, College of Biomedical and Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju 380-701, Republic of Korea
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Chou TW, Feng JH, Huang CC, Cheng YW, Chien SC, Wang SY, Shyur LF. A plant kavalactone desmethoxyyangonin prevents inflammation and fulminant hepatitis in mice. PLoS One 2013; 8:e77626. [PMID: 24143247 PMCID: PMC3797050 DOI: 10.1371/journal.pone.0077626] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 09/03/2013] [Indexed: 01/25/2023] Open
Abstract
Alpinia pricei Hayata is a Formosan plant which has been popularly used as nutraceutical or folk medicine for inflammation and various disorders. An active compound of the plant rhizomes, desmethoxyyangonin (DMY), was identified in this study for its novel effect against endotoxin lipopolysaccharide (LPS)-stimulated inflammation in murine macrophages and LPS/D-galactosamine (LPS/D-GalN)-induced fulminant hepatitis in mice. DMY was observed to significantly inhibit proliferation and activation of T cells ex vivo and the activity of several pro-inflammatory mediators in vitro. DMY also protected LPS/D-GalN−induced acute hepatic damages in mice through inhibiting aminotransferases activities and infiltrations of inflammatory macrophages, neutrophils and pathogenic T cells into the liver tissues. In addition, pretreatment with DMY significantly improved the survival rate of LPS/D-GalN−treated mice to 90% (9/10), compared to LPS/D-GalN−treated group (40%, 4/10). UPLC/MS platform-based comparative metabolomics approach was used to explore the serum metabolic profile in fulminant hepatic failure (FHF) mice with or without the DMY pretreatment. The results showed that LPS/D-GalN−induced hepatic damage is likely through perturbing amino acid metabolism, which leads to decreased pyruvate formation via catalysis of aminotransferases, and DMY treatment can prevent to a certain degree of these alterations in metabolic network in mouse caused by LPS/D-GalN. Mechanistic investigation demonstrated that DMY protects LPS or LPS/D-GalN−induced damages in cell or liver tissues mainly through de-regulating IKK/NFκB and Jak2/STAT3 signaling pathways. This report provides evidence-based knowledge to support the rationale for the use of A. pricei root extract in anti-inflammation and also its new function as hepatoprotetive agent against fulminant hepatitis.
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Affiliation(s)
- Tsui-Wei Chou
- Department of Culinary Arts, Taoyuan Innovation Institute of Technology, Chungli, Taoyuan County, Taiwan
| | - Jia-Hua Feng
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
- Institute of Plant Biology, National Taiwan University, Taipei, Taiwan
| | - Chi-Chang Huang
- Graduate Institute of Sports Science, National Taiwan Sport University, Guishan Township, Taoyuan County, Taiwan
| | - Ya-Wen Cheng
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
| | - Shih-Chang Chien
- The Experimental Forest Management Office, National Chung Hsing University, Taichung, Taiwan
| | - Sheng-Yang Wang
- Department of Forestry, National Chung Hsing University, Taichung, Taiwan
- * E-mail: (LS); (SW)
| | - Lie-Fen Shyur
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
- Graduate Institute of Pharmacognosy, Taipei Medical University, Taipei, Taiwan
- * E-mail: (LS); (SW)
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Rastogi R, Jiang Z, Ahmad N, Rosati R, Liu Y, Beuret L, Monks R, Charron J, Birnbaum MJ, Samavati L. Rapamycin induces mitogen-activated protein (MAP) kinase phosphatase-1 (MKP-1) expression through activation of protein kinase B and mitogen-activated protein kinase kinase pathways. J Biol Chem 2013; 288:33966-33977. [PMID: 24126911 DOI: 10.1074/jbc.m113.492702] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Mitogen-activated protein kinase phosphatase-1 (MKP-1), also known as dual specificity phosphatase-1 (DUSP-1), plays a crucial role in the deactivation of MAPKs. Several drugs with immune-suppressive properties modulate MKP-1 expression as part of their mechanism of action. We investigated the effect of mTOR inhibition through rapamycin and a dual mTOR inhibitor (AZD2014) on MKP-1 expression. Low dose rapamycin led to a rapid activation of both AKT and ERK pathways with a subsequent increase in MKP-1 expression. Rapamycin treatment led to phosphorylation of CREB, transcription factor 1 (ATF1), and ATF2, three transcription factors that bind to the cyclic AMP-responsive elements on the Mkp-1 promoter. Inhibition of either the MEK/ERK or the AKT pathway attenuated rapamycin-mediated MKP-1 induction. AZD2014 did not activate AKT but activated the ERK pathway, leading to a moderate MKP-1 induction. Using bone marrow-derived macrophages (BMDMs) derived from wild-type (WT) mice or mice deficient in AKT1 and AKT2 isoforms or BMDM from targeted deficiency in MEK1 and MEK2, we show that rapamycin treatment led to an increased MKP1 expression in BMDM from WT but failed to do so in BMDMs lacking the AKT1 isoform or MEK1 and MEK2. Importantly, rapamycin pretreatment inhibited LPS-mediated p38 activation and decreased nitric oxide and IL-6 production. Our work provides a conceptual framework for the observed immune modulatory effect of mTOR inhibition.
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Affiliation(s)
- Ruchi Rastogi
- Department of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, Wayne State University School of Medicine and Detroit Medical Center, Detroit, Michigan 48201
| | - Zhongliang Jiang
- Department of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, Wayne State University School of Medicine and Detroit Medical Center, Detroit, Michigan 48201
| | - Nisar Ahmad
- Department of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, Wayne State University School of Medicine and Detroit Medical Center, Detroit, Michigan 48201
| | - Rita Rosati
- Department of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, Wayne State University School of Medicine and Detroit Medical Center, Detroit, Michigan 48201
| | - Yusen Liu
- The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205
| | - Laurent Beuret
- Centre de Recherche sur le Cancer de l'Université Laval, CRCHU-Q, L'Hôtel-Dieu de Québec, Québec G1R 2J6, Canada
| | - Robert Monks
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Jean Charron
- Centre de Recherche sur le Cancer de l'Université Laval, CRCHU-Q, L'Hôtel-Dieu de Québec, Québec G1R 2J6, Canada
| | - Morris J Birnbaum
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Lobelia Samavati
- Department of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, Wayne State University School of Medicine and Detroit Medical Center, Detroit, Michigan 48201; Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, Michigan 48201.
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MicroRNA-124 mediates the cholinergic anti-inflammatory action through inhibiting the production of pro-inflammatory cytokines. Cell Res 2013; 23:1270-83. [PMID: 23979021 PMCID: PMC3817544 DOI: 10.1038/cr.2013.116] [Citation(s) in RCA: 172] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Revised: 07/04/2013] [Accepted: 07/15/2013] [Indexed: 12/22/2022] Open
Abstract
The vagus nerve can control inflammatory response through a 'cholinergic anti-inflammatory pathway', which is mediated by the α7-nicotinic acetylcholine receptor (α7nAChR) on macrophages. However, the intracellular mechanisms that link α7nAChR activation and pro-inflammatory cytokine production remain not well understood. In this study, we found that miR-124 is upregulated by cholinergic agonists in LPS-exposed cells and mice. Utilizing miR-124 mimic and siRNA knockdown, we demonstrated that miR-124 is a critical mediator for the cholinergic anti-inflammatory action. Furthermore, our data indicated that miR-124 modulates LPS-induced cytokine production by targeting signal transducer and activator of transcription 3 (STAT3) to decrease IL-6 production and TNF-α converting enzyme (TACE) to reduce TNF-α release. These results also indicate that miR-124 is a potential therapeutic target for the treatment of inflammatory diseases.
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169
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CYLD enhances severe listeriosis by impairing IL-6/STAT3-dependent fibrin production. PLoS Pathog 2013; 9:e1003455. [PMID: 23825949 PMCID: PMC3695090 DOI: 10.1371/journal.ppat.1003455] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 05/10/2013] [Indexed: 01/06/2023] Open
Abstract
The facultative intracellular bacterium Listeria monocytogenes (Lm) may cause severe infection in humans and livestock. Control of acute listeriosis is primarily dependent on innate immune responses, which are strongly regulated by NF-κB, and tissue protective factors including fibrin. However, molecular pathways connecting NF-κB and fibrin production are poorly described. Here, we investigated whether the deubiquitinating enzyme CYLD, which is an inhibitor of NF-κB-dependent immune responses, regulated these protective host responses in murine listeriosis. Upon high dose systemic infection, all C57BL/6 Cyld(-/-) mice survived, whereas 100% of wildtype mice succumbed due to severe liver pathology with impaired pathogen control and hemorrhage within 6 days. Upon in vitro infection with Lm, CYLD reduced NF-κB-dependent production of reactive oxygen species, interleukin (IL)-6 secretion, and control of bacteria in macrophages. Furthermore, Western blot analyses showed that CYLD impaired STAT3-dependent fibrin production in cultivated hepatocytes. Immunoprecipitation experiments revealed that CYLD interacted with STAT3 in the cytoplasm and strongly reduced K63-ubiquitination of STAT3 in IL-6 stimulated hepatocytes. In addition, CYLD diminished IL-6-induced STAT3 activity by reducing nuclear accumulation of phosphorylated STAT3. In vivo, CYLD also reduced hepatic STAT3 K63-ubiquitination and activation, NF-κB activation, IL-6 and NOX2 mRNA production as well as fibrin production in murine listeriosis. In vivo neutralization of IL-6 by anti-IL-6 antibody, STAT3 by siRNA, and fibrin by warfarin treatment, respectively, demonstrated that IL-6-induced, STAT3-mediated fibrin production significantly contributed to protection in Cyld(-/-) mice. In addition, in vivo Cyld siRNA treatment increased STAT3 phosphorylation, fibrin production, pathogen control and survival of Lm-infected WT mice illustrating that therapeutic inhibition of CYLD augments the protective NF-κB/IL-6/STAT3 pathway and fibrin production.
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170
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Sepúlveda-Arias J, Veloza L, Escobar L, Orozco L, Lopera I. Anti-inflammatory effects of the main constituents and epoxides derived from the essential oils obtained fromTagetes lucida, Cymbopogon citratus, Lippia albaandEucalyptus citriodora. JOURNAL OF ESSENTIAL OIL RESEARCH 2013. [DOI: 10.1080/10412905.2012.751556] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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171
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Yeh CH, Shih HC, Hong HM, Lee SS, Yang ML, Chen CJ, Kuan YH. Protective effect of wogonin on proinflammatory cytokine generation via Jak1/3-STAT1/3 pathway in lipopolysaccharide stimulated BV2 microglial cells. Toxicol Ind Health 2013; 31:960-6. [DOI: 10.1177/0748233713485886] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Wogonin is a flavonoid compound which exhibits antioxidation, anti-inflammation, neuroprotection, and antitumorgenesis functions. However, the mechanism of how wogonin reduces proinflammatory cytokine generation in activated microglia is unclear. At present, we found wogonin inhibited lipopolysaccharide (LPS)-/interferon-γ (INF-γ)-induced generation of interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α). Wogonin exhibited parallel inhibition on LPS-/INF-γ-induced expression of IL-6 and TNF-α messenger RNA at the same concentration range. LPS-/INF-γ-induced phosphorylation of signal transduction and transcription 1 and 3 (STAT1/3) were also inhibited by wogonin. Although wogonin expressed only weak inhibitory effect on LPS-/INF-γ-induced phosphorylation of Janus kinase-2 (Jak-2) and tyrosine kinase (Tyk)-2, it significantly attenuated the phosphorylation of Jak-1 and Jak-3. These results indicated that the blockade of IL-6 and TNF-α production by wogonin in LPS-/INF-γ-stimulated BV2 microglial cells was attributed mainly to the interference in Jak-1/-3-STAT1/3 signaling pathway.
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Affiliation(s)
- Chung-Hsin Yeh
- Department of Neurology, Show Chwan Memorial Hospital, Changhua, Taiwan
| | - Hung-Che Shih
- Department of Pharmacology, School of Medicine, Chung Shan Medical University, Taiwan
- Department of Pharmacy, Chung Shan Medical University Hospital, Taichung, Taiwan
| | - Hui-Mei Hong
- School of Biomedical Sciences, Chung Shan Medical University, Taichung, Taiwan
| | - Shiuan-Shinn Lee
- School of Public Health, Chung Shan Medical University, Taichung, Taiwan
| | - Ming-Ling Yang
- Department of Anatomy, School of Medicine, Chung Shan Medical University, Taichung, Taiwan
| | - Chun-Jung Chen
- Department of Education and Research, Taichung Veterans General Hospital, Taichung, Taiwan
- Center for General Education, Tunghai University, Taichung, Taiwan
| | - Yu-Hsiang Kuan
- Department of Pharmacology, School of Medicine, Chung Shan Medical University, Taiwan
- Department of Pharmacy, Chung Shan Medical University Hospital, Taichung, Taiwan
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172
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Jiang J, Kang TB, Shim DW, Oh NH, Kim TJ, Lee KH. Indole-3-carbinol inhibits LPS-induced inflammatory response by blocking TRIF-dependent signaling pathway in macrophages. Food Chem Toxicol 2013; 57:256-61. [PMID: 23597448 DOI: 10.1016/j.fct.2013.03.040] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 03/10/2013] [Accepted: 03/27/2013] [Indexed: 12/26/2022]
Abstract
Indole-3-carbinol (I3C), a natural hydrolysis product of glucobrassicin, is a member of the Brassica family of vegetables and is known to have various anti-cancer activities. In the present study, we assessed in vitro and in vivo anti-inflammatory effects of I3C and its molecular mechanisms. I3C attenuated the production of pro-inflammatory mediators such as NO, IL-6, and IL-1β in LPS-induced Raw264.7 cells and THP-1 cells through attenuation of the TRIF-dependent signaling pathway. Furthermore, I3C suppressed the infiltration of immune cells into the lung and pro-inflammatory cytokine production such as IL-6, TNF-α in broncho-alveolar lavage fluid (BALF) in the LPS-induced acute lung injury mouse model. I3C also suppressed IL-1β secretion in nigericin treated in vivo model. I3C has potent anti-inflammatory effects through regulating TRIF-dependent signaling pathways, suggesting that I3C may provide a valuable therapeutic strategy in treating various inflammatory diseases.
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Affiliation(s)
- Jun Jiang
- Department of Biotechnology, College of Biomedical and Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju 380-701, Republic of Korea
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Zhu ZG, Jin H, Yu PJ, Tian YX, Zhang JJ, Wu SG. Mollugin inhibits the inflammatory response in lipopolysaccharide-stimulated RAW264.7 macrophages by blocking the Janus kinase-signal transducers and activators of transcription signaling pathway. Biol Pharm Bull 2013; 36:399-406. [PMID: 23318249 DOI: 10.1248/bpb.b12-00804] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mollugin, a kind of naphthohydroquinone, is a major constituent isolated from Rubia cordifolia L. and demonstrated to possess anti-inflammatory activity in recent reports. However, the effects and mechanism of action of mollugin in inflammation have not been fully defined. The present study was therefore designed to investigate whether mollugin suppresses the inflammatory response in lipopolysaccharide (LPS)-stimulated RAW264.7 macrophages. Mollugin attenuated the LPS-induced expression of nitric oxide (NO), inducible nitric oxide synthase (iNOS), interleukin (IL)-1β and IL-6 but augmented the expression of tumor necrosis factor (TNF)-α. Mollugin did not inhibit the degradation of inhibitory kappa B (IκB)-α or the nuclear translocation of p65 nuclear factor-kappa B (NF-κB) but rather enhanced the phosphorylation of p65 subunits evoked by LPS. Mollugin did not inhibit the phosphorylation of extracellular-signal-related kinase (ERK) 1/2, p38, and c-Jun N-terminal kinase (JNK) 1/2 either. Mollugin significantly reduced the LPS-mediated phosphorylation of Janus kinase (JAK) 2, signal transducers and activators of transcription (STAT) 1 and STAT3. Molecular docking analysis showed that mollugin binds to JAK2 in a manner similar to that of AG490, a specific JAK2 inhibitor. We conclude that mollugin may be a JAK2 inhibitor and inhibits LPS-induced inflammatory responses by blocking the activation of the JAK-STAT pathway.
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Affiliation(s)
- Zheng-Guang Zhu
- School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China
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174
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Zhang X, Tao Y, Wang J, Garcia-Mata R, Markovic-Plese S. Simvastatin inhibits secretion of Th17-polarizing cytokines and antigen presentation by DCs in patients with relapsing remitting multiple sclerosis. Eur J Immunol 2012; 43:281-9. [DOI: 10.1002/eji.201242566] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Revised: 08/16/2012] [Accepted: 10/12/2012] [Indexed: 12/16/2022]
Affiliation(s)
- Xin Zhang
- Department of Neurology; University of North Carolina at Chapel Hill; NC; USA
| | - Yazhong Tao
- Department of Neurology; University of North Carolina at Chapel Hill; NC; USA
| | - Jinzhao Wang
- Department of Neurology; University of North Carolina at Chapel Hill; NC; USA
| | - Rafael Garcia-Mata
- Department of Cell and Developmental Biology; University of North Carolina at Chapel Hill; NC; USA
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Systemic treatment with the inhibitory neurotransmitter γ-aminobutyric acid aggravates experimental autoimmune encephalomyelitis by affecting proinflammatory immune responses. J Neuroimmunol 2012. [PMID: 23194644 DOI: 10.1016/j.jneuroim.2012.11.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Transcriptomic and proteomic analyses of multiple sclerosis (MS) lesions indicate alterations in the gamma-aminobutyric acid (GABA) inhibitory system, suggesting its involvement in the disease process. To further elucidate the role of GABA in central nervous system (CNS) inflammation in vivo, the chronic myelin oligodendrocyte glycoprotein (MOG)(35-55) experimental autoimmune encephalomyelitis (EAE) model was used. Daily GABA injections (200mg/kg) from day 3 onwards significantly augmented disease severity, which was associated with increased CNS mRNA expression levels of tumor necrosis factor alpha (TNF-α) and interleukin (IL)-6. GABA-treated mice showed enhanced MOG-dependent proliferation and were skewed towards a T helper 1 phenotype. Moreover, in vitro, the lipopolysaccharide (LPS)-induced increase in interleukin (IL)-6 production by macrophages was enhanced at low GABA concentrations (0.03-0.3mM). In sharp contrast to exogenous GABA administration, endogenous GABA increment by systemic treatment with the GABA-transaminase inhibitor vigabatrin (250mg/kg) had prophylactic as well as therapeutic potential in EAE. Together, these results indicate an immune amplifying role of GABA in neuroinflammatory diseases like MS.
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176
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Lee MMK, Chui RKS, Tam IYS, Lau AHY, Wong YH. CCR1-mediated STAT3 tyrosine phosphorylation and CXCL8 expression in THP-1 macrophage-like cells involve pertussis toxin-insensitive Gα(14/16) signaling and IL-6 release. THE JOURNAL OF IMMUNOLOGY 2012; 189:5266-76. [PMID: 23125416 DOI: 10.4049/jimmunol.1103359] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Agonists of CCR1 contribute to hypersensitivity reactions and atherosclerotic lesions, possibly via the regulation of the transcription factor STAT3. CCR1 was demonstrated to use pertussis toxin-insensitive Gα(14/16) to stimulate phospholipase Cβ and NF-κB, whereas both Gα(14) and Gα(16) are also capable of activating STAT3. The coexpression of CCR1 and Gα(14/16) in human THP-1 macrophage-like cells suggests that CCR1 may use Gα(14/16) to induce STAT3 activation. In this study, we demonstrated that a CCR1 agonist, leukotactin-1 (CCL15), could indeed stimulate STAT3 Tyr(705) and Ser(727) phosphorylation via pertussis toxin-insensitive G proteins in PMA-differentiated THP-1 cells, human erythroleukemia cells, and HEK293 cells overexpressing CCR1 and Gα(14/16). The STAT3 Tyr(705) and Ser(727) phosphorylations were independent of each other and temporally distinct. Subcellular fractionation and confocal microscopy illustrated that Tyr(705)-phosphorylated STAT3 translocated to the nucleus, whereas Ser(727)-phosphorylated STAT3 was retained in the cytosol after CCR1/Gα(14) activation. CCL15 was capable of inducing IL-6 and IL-8 (CXCL8) production in both THP-1 macrophage-like cells and HEK293 cells overexpressing CCR1 and Gα(14/16). Neutralizing Ab to IL-6 inhibited CCL15-mediated STAT3 Tyr(705) phosphorylation, whereas inhibition of STAT3 activity abolished CCL15-activated CXCL8 release. The ability of CCR1 to signal through Gα(14/16) provides a linkage for CCL15 to regulate IL-6/STAT3-signaling cascades, leading to expression of CXCL8, a cytokine that is involved in inflammation and the rupture of atherosclerotic plaque.
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Affiliation(s)
- Maggie M K Lee
- Division of Life Science, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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177
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Chen Q, Wang H, Liu Y, Song Y, Lai L, Han Q, Cao X, Wang Q. Inducible microRNA-223 down-regulation promotes TLR-triggered IL-6 and IL-1β production in macrophages by targeting STAT3. PLoS One 2012; 7:e42971. [PMID: 22937006 PMCID: PMC3427313 DOI: 10.1371/journal.pone.0042971] [Citation(s) in RCA: 197] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 07/16/2012] [Indexed: 01/27/2023] Open
Abstract
MicroRNAs are small non-coding RNA molecules that regulate gene expression by either translational inhibition or mRNA degradation. MicroRNAs play pivotal roles in the regulation of both innate and adaptive immune responses, including TLR-triggered inflammatory response. Here we reported that the expression of microRNA-223 (miR-223) was significantly decreased in murine macrophages during activation by lipopolysaccharide (LPS) or poly (I∶C) stimulation. The inducible miR-223 down-regulation resulted in the activation of signal transducer and activator of transcription 3 (STAT3), which is directly targeted by miR-223, thus promoting the production of pro-inflammatory cytokines IL-6 and IL-1β, but not TNF-α. Interestingly, IL-6 was found to be a main factor in inducing the decrease in miR-223 expression after LPS stimulation, which formed a positive feedback loop to regulate IL-6 and IL-1β. Herein, our findings provide a new explanation characterizing the molecular mechanism responsible for the regulation of IL-6 production after TLR-triggered macrophage activation.
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Affiliation(s)
- Qingyun Chen
- Institute of Immunology, Zhejiang University School of Medicine, Hangzhou, People's Republic of China
| | - Hui Wang
- Medical College of Chinese People's Armed Police Force, Tianjin, People's Republic of China
| | - Yang Liu
- Institute of Immunology, Zhejiang University School of Medicine, Hangzhou, People's Republic of China
| | - Yinjing Song
- Institute of Immunology, Zhejiang University School of Medicine, Hangzhou, People's Republic of China
| | - Lihua Lai
- Institute of Immunology, Zhejiang University School of Medicine, Hangzhou, People's Republic of China
| | - Quan Han
- Institute of Immunology, Zhejiang University School of Medicine, Hangzhou, People's Republic of China
| | - Xuetao Cao
- Institute of Immunology, Zhejiang University School of Medicine, Hangzhou, People's Republic of China
- National Key Laboratory of Medical Immunology & Institute of Immunology, Second Military Medical University, Shanghai, People's Republic of China
| | - Qingqing Wang
- Institute of Immunology, Zhejiang University School of Medicine, Hangzhou, People's Republic of China
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178
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Leise B, Watts M, Tanhoff E, Johnson P, Black S, Belknap J. Laminar Regulation of STAT1 and STAT3 in Black Walnut Extract and Carbohydrate Overload Induced Models of Laminitis. J Vet Intern Med 2012; 26:996-1004. [DOI: 10.1111/j.1939-1676.2012.00944.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Affiliation(s)
| | - M. Watts
- Department of Veterinary Clinical Sciences; College of Veterinary Medicine; The Ohio State University; Columbus; OH
| | - E. Tanhoff
- Department of Veterinary Clinical Sciences; College of Veterinary Medicine; The Ohio State University; Columbus; OH
| | - P.J. Johnson
- Department of Veterinary Medicine and Surgery; The University of Missouri-Columbia; Columbia; MO
| | - S.J. Black
- Department of Veterinary and Animal Sciences; University of Massachusetts; Amherst; MA
| | - J.K. Belknap
- Department of Veterinary Clinical Sciences; College of Veterinary Medicine; The Ohio State University; Columbus; OH
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179
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Hepatoprotective effect and mechanistic insights of deoxyelephantopin, a phyto-sesquiterpene lactone, against fulminant hepatitis. J Nutr Biochem 2012; 24:516-30. [PMID: 22748804 DOI: 10.1016/j.jnutbio.2012.01.013] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 01/20/2012] [Accepted: 01/30/2012] [Indexed: 01/23/2023]
Abstract
Deoxyelephantopin (DET) is an abundant sesquiterpene lactone isolated from an anecdotally hepatoprotective phytomedicine, Elephantopus scaber. Our objective in this study was to provide scientific evidence for the in vivo efficacy and the underlying mechanisms of action of DET in lipopolysaccharide/d-galactosamine (LPS/D-GalN)-induced fulminant hepatitis. We investigated both the protective effect of pretreatment with DET (10 mg/kg body weight, Pre-DET10) prior to administration of LPS/D-GalN and the therapeutic effect of treatment with 10 mg/kg DET (Post-DET10) or the hepatoprotective drug silymarin (Post-SM10) following the administration of LPS/D-GalN. Our data showed that Pre-DET10 prevented LPS/D-GalN-induced infiltration of F4/80 monocytes/macrophages and an increase of nitrotyrosine and cyclooxygenase-2 protein in liver tissues. Further, Post-DET10 and Psot-SM10 treatments protected against liver cell apoptosis. All three treatments suppressed serum aminotransferase activities, tumor necrosis factor-alpha and interleukin-6 levels, and serum and hepatic matrix metalloproteinase-9 activity. The Pre-DET10 or Post-DET10 and Post-SM10 treatments in combination with inhibition of heme oxygenase-1 expression ultimately decreased protection of mice from LPS/D-GalN-induced mortality, with decreased survival from 75% and 62.5% to 50%, respectively. Results obtained from serial liver scintigraphy with (99m)Tc-diisopropyl iminodiacetic acid (DISIDA) on single-photon emission computed tomography analysis showed that both liver uptake and excretion times of DISIDA were significantly delayed in LPS/D-GalN-treated animals and were effectively recovered by DET and silymarin treatment. This report demonstrates that DET functions in the modulating multiple molecular targets or signaling pathways that counteract inflammation during the progression of fulminant hepatitis and may serve as a novel lead compound for future development of anti-inflammatory or hepatoprotective agents.
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180
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Liu C, Su D. Nicotinic acetylcholine receptor α7 subunit: a novel therapeutic target for cardiovascular diseases. Front Med 2012; 6:35-40. [PMID: 22460446 DOI: 10.1007/s11684-012-0171-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Accepted: 11/02/2011] [Indexed: 12/19/2022]
Abstract
Inflammation is important in the pathogenesis and development of cardiovascular diseases. Recent studies show that vagus nerve stimulation inhibits pro-inflammatory cytokine production through "the cholinergic anti-inflammatory pathway," more specifically via the α7 nicotinic acetylcholine receptor (α7nAChR). In the current study, the role of the cholinergic anti-inflammatory pathway during septic shock, hypertension, and myocardial infarction is reviewed, and its possible clinical implications in cardiovascular diseases are discussed.
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Affiliation(s)
- Chong Liu
- Department of Pharmacology, Second Military Medical University, Shanghai 200433, China
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181
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Kim JJ, Jiang J, Shim DW, Kwon SC, Kim TJ, Ye SK, Kim MK, Shin YK, Koppula S, Kang TB, Choi DK, Lee KH. Anti-inflammatory and anti-allergic effects of Agrimonia pilosa Ledeb extract on murine cell lines and OVA-induced airway inflammation. JOURNAL OF ETHNOPHARMACOLOGY 2012; 140:213-221. [PMID: 22289347 DOI: 10.1016/j.jep.2011.12.035] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Revised: 12/19/2011] [Accepted: 12/20/2011] [Indexed: 05/31/2023]
Abstract
ETHNOPHARMACOLOGICAL EVIDENCE Agrimonia pilosa Ledeb (Rosaceae, AP) has long been used as a traditional medicine in Korea and other Asian countries to treat various diseases. AIM OF THE STUDY In the present study, the anti-inflammatory and anti-allergic effects of AP extract in in vitro cell lines and in vivo mouse model of inflammation and the molecular mechanisms involved were reported. MATERIALS AND METHODS Using Raw 264.7 murine macrophages the effects of methanol extract of AP in lipopolysaccharide (LPS)-induced production of inflammatory mediators were measured. Further IgE-DNP-induced interleukin (IL)-4 production and degranulation in RBL-2H3 rat basophilic cell lines was also estimated. To investigate the anti-asthmatic effect of AP in vivo, airway inflammation in ovalbumin (OVA)-induced mouse model was used. RESULTS AP attenuated the production of inflammatory mediators such as NO, PGE(2) and pro-inflammatory cytokines in LPS-induced Raw 264.7 cells. Further, AP inhibited IL-4 production and degranulation in IgE-DNP-induced RBL-2H3 cells. Furthermore, AP attenuated the infiltration of immune cells into lung, cytokines production in broncho-alveolar lavage fluid (BALF) and airway-hyperresponsiveness (AHR) on OVA-induced mouse model of inflammation. CONCLUSION Our results showed that AP attenuated the activation of macrophages, basophils, and inhibited the OVA-induced airway inflammation. The molecular mechanisms leading to AP's potent anti-inflammatory and anti-allergic effects might be through regulation of TRIF-dependent and Syk-PLCγ/AKT signaling pathways, suggesting that AP may provide a valuable therapeutic strategy in treating various inflammatory diseases including asthma.
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Affiliation(s)
- Jae-Jin Kim
- Department of Biotechnology, College of Biomedical & Health Science, Konkuk University, Chungju 380-701, Republic of Korea
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182
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Wang X, Liu Q, Ihsan A, Huang L, Dai M, Hao H, Cheng G, Liu Z, Wang Y, Yuan Z. JAK/STAT Pathway Plays a Critical Role in the Proinflammatory Gene Expression and Apoptosis of RAW264.7 Cells Induced by Trichothecenes as DON and T-2 Toxin. Toxicol Sci 2012; 127:412-24. [DOI: 10.1093/toxsci/kfs106] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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183
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Ozkurede VU, Franchi L. Immunology in clinic review series; focus on autoinflammatory diseases: role of inflammasomes in autoinflammatory syndromes. Clin Exp Immunol 2012; 167:382-90. [PMID: 22288581 PMCID: PMC3374270 DOI: 10.1111/j.1365-2249.2011.04535.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/18/2011] [Indexed: 12/12/2022] Open
Abstract
UNLABELLED OTHER THEMES PUBLISHED IN THIS IMMUNOLOGY IN THE CLINIC REVIEW SERIES Allergy, Host Responses, Cancer, Type 1 diabetes and viruses, Metabolic diseases. SUMMARY Autoinflammatory syndromes are disorders characterized by the hyperactivation of the innate immune system in the absence of microbial infection or autoantibody production. Some autoinflammatory syndromes are associated with recurrent episodes of fever and systemic inflammation that are caused by dysregulated activation of inflammasomes, molecular platforms responsible for the activation of caspase-1 and the production of interleukin (IL)-1β. In this review we will discuss the role of IL-1β and the inflammasomes in host defence and how mutations of two genes, NLRP3 and PYRIN, leads to the autoinflammatory syndromes, cryopyrin-associated periodic syndromes (CAPS) and familial Mediterranean fever (FMF). Both CAPS and FMF are characterized by increased inflammasome activity and overproduction of IL-1β which is ultimately responsible for disease manifestations. Importantly, understanding the molecular mechanisms of these syndromes has led to effective treatment for these rare diseases with biological drugs that target IL-1β-mediated signalling.
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Affiliation(s)
- V U Ozkurede
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109, USA
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184
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Bauerfeld CP, Rastogi R, Pirockinaite G, Lee I, Hüttemann M, Monks B, Birnbaum MJ, Franchi L, Nuñez G, Samavati L. TLR4-mediated AKT activation is MyD88/TRIF dependent and critical for induction of oxidative phosphorylation and mitochondrial transcription factor A in murine macrophages. THE JOURNAL OF IMMUNOLOGY 2012; 188:2847-57. [PMID: 22312125 DOI: 10.4049/jimmunol.1102157] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Mitochondria play a critical role in cell survival and death. Mitochondrial recovery during inflammatory processes such as sepsis is associated with cell survival. Recovery of cellular respiration, mitochondrial biogenesis, and function requires coordinated expression of transcription factors encoded by nuclear and mitochondrial genes, including mitochondrial transcription factor A (T-fam) and cytochrome c oxidase (COX, complex IV). LPS elicits strong host defenses in mammals with pronounced inflammatory responses, but also triggers activation of survival pathways such as AKT pathway. AKT/PKB is a serine/threonine protein kinase that plays an important role in cell survival, protein synthesis, and controlled inflammation in response to TLRs. Hence we investigated the role of LPS-mediated AKT activation in mitochondrial bioenergetics and function in cultured murine macrophages (B6-MCL) and bone marrow-derived macrophages. We show that LPS challenge led to increased expression of T-fam and COX subunits I and IV in a time-dependent manner through early phosphorylation of the PI3K/AKT pathway. PI3K/AKT pathway inhibitors abrogated LPS-mediated T-fam and COX induction. Lack of induction was associated with decreased ATP production, increased proinflammatory cytokines (TNF-α), NO production, and cell death. The TLR4-mediated AKT activation and mitochondrial biogenesis required activation of adaptor protein MyD88 and Toll/IL-1R domain-containing adaptor-inducing IFN-β. Importantly, using a genetic approach, we show that the AKT1 isoform is pivotal in regulating mitochondrial biogenesis in response to TLR4 agonist.
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Affiliation(s)
- Christian P Bauerfeld
- Department of Pediatrics, St. John Hospital and Medical Center, Detroit, MI 48236, USA
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185
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Maes M, Fišar Z, Medina M, Scapagnini G, Nowak G, Berk M. New drug targets in depression: inflammatory, cell-mediated immune, oxidative and nitrosative stress, mitochondrial, antioxidant, and neuroprogressive pathways. And new drug candidates--Nrf2 activators and GSK-3 inhibitors. Inflammopharmacology 2012; 20:127-50. [PMID: 22271002 DOI: 10.1007/s10787-011-0111-7] [Citation(s) in RCA: 246] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2011] [Accepted: 12/15/2011] [Indexed: 02/07/2023]
Abstract
This paper reviews new drug targets in the treatment of depression and new drug candidates to treat depression. Depression is characterized by aberrations in six intertwined pathways: (1) inflammatory pathways as indicated by increased levels of proinflammatory cytokines, e.g. interleukin-1 (IL-1), IL-6, and tumour necrosis factor α. (2) Activation of cell-mediated immune pathways as indicated by an increased production of interferon γ and neopterin. (3) Increased reactive oxygen and nitrogen species and damage by oxidative and nitrosative stress (O&NS), including lipid peroxidation, damage to DNA, proteins and mitochondria. (4) Lowered levels of key antioxidants, such as coenzyme Q10, zinc, vitamin E, glutathione, and glutathione peroxidase. (5) Damage to mitochondria and mitochondrial DNA and reduced activity of respiratory chain enzymes and adenosine triphosphate production. (6) Neuroprogression, which is the progressive process of neurodegeneration, apoptosis, and reduced neurogenesis and neuronal plasticity, phenomena that are probably caused by inflammation and O&NS. Antidepressants tend to normalize the above six pathways. Targeting these pathways has the potential to yield antidepressant effects, e.g. using cytokine antagonists, minocycline, Cox-2 inhibitors, statins, acetylsalicylic acid, ketamine, ω3 poly-unsaturated fatty acids, antioxidants, and neurotrophic factors. These six pathways offer new, pathophysiologically guided drug targets suggesting that novel therapies could be developed that target these six pathways simultaneously. Both nuclear factor (erythroid-derived 2)-like 2 (Nrf2) activators and glycogen synthase kinase-3 (GSK-3) inhibitors target the six above-mentioned pathways. GSK-3 inhibitors have antidepressant effects in animal models of depression. Nrf2 activators and GSK-3 inhibitors have the potential to be advanced to phase-2 clinical trials to examine whether they augment the efficacy of antidepressants or are useful as monotherapy.
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Affiliation(s)
- Michael Maes
- Maes Clinics@TRIA, 998 Rimklongsamsen Road, Bangkok 10310, Thailand.
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186
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Park EJ, Kim SA, Choi YM, Kwon HK, Shim W, Lee G, Choi S. Capric acid inhibits NO production and STAT3 activation during LPS-induced osteoclastogenesis. PLoS One 2011; 6:e27739. [PMID: 22110749 PMCID: PMC3218024 DOI: 10.1371/journal.pone.0027739] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Accepted: 10/24/2011] [Indexed: 02/05/2023] Open
Abstract
Capric acid is a second medium-chain fatty acid, and recent studies have shown that fatty acids are associated with bone density and reduce bone turnover. In this study, we investigated the effects of capric acid on lipopolysaccharide (LPS)-induced osteoclastogenesis in RAW264.7 cells. After treatment with capric acid (1 mM), the number of tartrate resistant acid phosphatase (TRAP)-positive cells decreased significantly. Capric acid reduced LPS-induced TRAP expression, an osteoclast differentiation marker, without inhibiting cell viability. LPS strongly upregulated inducible nitric oxide synthase (iNOS) mRNA levels and nitric oxide (NO) production, whereas capric acid inhibited them. Furthermore, capric acid also inhibited monocyte chemoattractant protein-1 (MCP-1) mRNA expression. Subsequently, we investigated various intracellular signaling proteins, including nuclear factor-κB (NF-κB), c-Jun-N-terminal kinase (JNK), extracellular signal regulated kinase 1/2 (ERK1/2), and signal transducer and activator of transcription 1 (STAT1) and STAT3 associated with osteoclastogenesis. Capric acid had no effects on LPS-induced activation of the NF-κB, JNK, ERK1/2, and STAT1 pathways. However, capric acid inhibited LPS-induced phosphorylation of Ser727 in STAT3. Additionally, stattic (a STAT3 inhibitor) inhibited LPS-induced iNOS and MCP-1 gene expression. In conclusion, we demonstrated that capric acid inhibited LPS-induced osteoclastogenesis by suppressing NO production via the STAT3 pathway. These results suggest that capric acid has important therapeutic implications for treating bone diseases associated with excessive osteoclastogenesis.
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Affiliation(s)
- Eun-Jung Park
- Department of Molecular Science and Technology, Ajou University, Suwon, Korea
| | - Sun A. Kim
- Department of Molecular Science and Technology, Ajou University, Suwon, Korea
| | - Yong-Min Choi
- Department of Molecular Science and Technology, Ajou University, Suwon, Korea
| | - Hyuk-Kwon Kwon
- Department of Molecular Science and Technology, Ajou University, Suwon, Korea
| | - Wooyoung Shim
- Department of Molecular Science and Technology, Ajou University, Suwon, Korea
| | - Gwang Lee
- Department of Molecular Science and Technology, Ajou University, Suwon, Korea
| | - Sangdun Choi
- Department of Molecular Science and Technology, Ajou University, Suwon, Korea
- * E-mail:
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187
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Yu PJ, Jin H, Zhang JY, Wang GF, Li JR, Zhu ZG, Tian YX, Wu SY, Xu W, Zhang JJ, Wu SG. Pyranocoumarins Isolated from Peucedanum praeruptorum Dunn Suppress Lipopolysaccharide-Induced Inflammatory Response in Murine Macrophages Through Inhibition of NF-κB and STAT3 Activation. Inflammation 2011; 35:967-77. [DOI: 10.1007/s10753-011-9400-y] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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188
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Strecker JK, Minnerup J, Gess B, Ringelstein EB, Schäbitz WR, Schilling M. Monocyte chemoattractant protein-1-deficiency impairs the expression of IL-6, IL-1β and G-CSF after transient focal ischemia in mice. PLoS One 2011; 6:e25863. [PMID: 22031820 PMCID: PMC3198727 DOI: 10.1371/journal.pone.0025863] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Accepted: 09/13/2011] [Indexed: 12/22/2022] Open
Abstract
Monocyte chemoattractant protein-1 (MCP-1), a chemokine secreted by neurons and astrocytes following stroke is known to aggravate ischemia-related damage. Previous studies revealed that MCP-1-deficient mice develop smaller infarcts and have an improved neurological outcome, whereas mice overexpressing MCP-1 show worsened brain damage and impaired neurological function. The aim of the present study was to elucidate the molecular background of the enhanced recovery in MCP-1-deficient mice after stroke. For this purpose, we (1) performed expression analyses on crucial post-stroke related inflammatory genes in MCP-1-deficient mice compared to wildtype controls, (2) analyzed a possible impact of MCP-1 on astrocyte activation (3) investigated the cellular origin of respective inflammatory cytokines and (4) analyzed the impact of MCP-1 secretion on the migration of both neutrophil granulocytes and T-cells. Here we report that MCP-1-deficiency leads to a shift towards a less inflammatory state following experimental occlusion of the middle cerebral artery including an impaired induction of interleukin-6, interleukin-1β and granulocyte-colony stimulating factor expression as well as a subsequent diminished influx of hematogenous cells. Additionally, MCP-1-deficient mice developed smaller infarcts 36 hours after experimental stroke. Investigations revealed no differences in transcription of tumor necrosis factor-α and astrogliosis 12 and 36 hours after onset of ischemia. These novel results help to understand post ischemic, inflammatory mechanisms and might give further arguments towards therapeutical interventions by modulation of MCP-1 expression in post stroke inflammation.
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189
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Posselt G, Schwarz H, Duschl A, Horejs-Hoeck J. Suppressor of cytokine signaling 2 is a feedback inhibitor of TLR-induced activation in human monocyte-derived dendritic cells. THE JOURNAL OF IMMUNOLOGY 2011; 187:2875-84. [PMID: 21844389 DOI: 10.4049/jimmunol.1003348] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Dendritic cells (DCs) are key players in initiating and directing the immune response. Therefore, their activation state and functional differentiation need to be tightly controlled. The activating stimuli and their signaling networks have long been an area of focus in DC research. Recent investigations have also shed light on the mechanisms of counterregulation and fine-tuning of DC functions. One class of proteins involved in these processes is the family of suppressors of cytokine signaling (SOCS), whose members were originally described as feedback inhibitors of cytokine-induced JAK/STAT signaling. Essential roles in DC function have been assigned to SOCS1 and SOCS3. In this article, we show that SOCS2 also is involved in DC regulation. In human and in murine DCs, SOCS2 is a highly TLR-responsive gene, which is expressed in a time-delayed fashion beginning 8 h after TLR ligation. Functionally, silencing of SOCS2 in DCs results in hyperphosphorylation of STAT3 at later time points. As a consequence, SOCS2-deficient DCs secrete increased amounts of the cytokines IL-1β and IL-10, both being transcriptional targets of STAT3. We propose a model in which SOCS2 acts as a negative regulator of TLR-induced DC activation. The delayed expression of SOCS2 provides a mechanism of late-phase counterregulation and limitation of inflammation-driving DC activity.
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Affiliation(s)
- Gernot Posselt
- Division of Allergy and Immunology, Department of Molecular Biology, Paris Lodron University of Salzburg, 5020 Salzburg, Austria
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190
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LPS hypersensitivity of gp130 mutant mice is independent of elevated haemopoietic TLR4 signaling. Immunol Cell Biol 2011; 90:559-63. [PMID: 21670738 DOI: 10.1038/icb.2011.56] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Among the many inflammatory mediators induced by the prototypical inflammatory stimulus lipopolysaccharide (LPS), which signals via Toll-like receptor (TLR)-4, interleukin (IL)-6 has recently been shown to feedback and augment TLR4 signaling when overproduced in LPS hypersensitive gp130(F/F) mice. This regulation by IL-6 in gp130(F/F) mice requires hyperactivation of the latent transcription factor signal transducer and activator of transcription (STAT) 3 via the IL-6 signaling receptor subunit gp130. However, the identity of LPS/TLR4-responsive inflammatory signaling pathways and gene networks, which are modulated by IL-6 (via gp130/STAT3), and the extent to which the tissue and cellular context of this regulation contributes to LPS-induced endotoxic shock in gp130(F/F) mice, are unknown. We report here that in LPS-treated macrophages from gp130(F/F) mice, gp130 hyperactivation upregulated the LPS-induced expression of inflammatory mediators downstream of Janus kinase (JAK)/STAT, nuclear factor κ-light-chain-enhancer of activated B cells, interferon regulatory factor and c-Jun N-terminal kinase/p38 mitogen-activated protein kinase pathways. Notably, however, LPS administration to bone marrow chimeras indicated that heightened LPS/TLR4 signaling in haemopoietic-derived gp130(F/F) immune cells is dispensable for the hypersensitivity of gp130(F/F) mice to LPS-induced endotoxemia. To understand the molecular consequences of gp130 hyperactivity in non-haemopoietic tissue on LPS-induced systemic inflammation, global gene expression profiling of livers from LPS-treated gp130(F/F) mice was performed and identified 264 hepatic LPS-responsive genes, which are differentially regulated by hyperactive gp130 signaling. Collectively, the substantial transcriptional reprogramming of LPS-responsive genes in gp130(F/F) mice emphasizes non-haemopoietic gp130 signaling as a key regulator of systemic inflammatory responses during LPS-induced endotoxemia.
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Jedinak A, Dudhgaonkar S, Wu QL, Simon J, Sliva D. Anti-inflammatory activity of edible oyster mushroom is mediated through the inhibition of NF-κB and AP-1 signaling. Nutr J 2011; 10:52. [PMID: 21575254 PMCID: PMC3120742 DOI: 10.1186/1475-2891-10-52] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Accepted: 05/16/2011] [Indexed: 01/08/2023] Open
Abstract
Background Mushrooms are well recognized for their culinary properties as well as for their potency to enhance immune response. In the present study, we evaluated anti-inflammatory properties of an edible oyster mushroom (Pleurotus ostreatus) in vitro and in vivo. Methods RAW264.7 murine macrophage cell line and murine splenocytes were incubated with the oyster mushroom concentrate (OMC, 0-100 μg/ml) in the absence or presence of lipopolysacharide (LPS) or concanavalin A (ConA), respectively. Cell proliferation was determined by MTT assay. Expression of cytokines and proteins was measured by ELISA assay and Western blot analysis, respectively. DNA-binding activity was assayed by the gel-shift analysis. Inflammation in mice was induced by intraperitoneal injection of LPS. Results OMC suppressed LPS-induced secretion of tumor necrosis factor-α (TNF-α, interleukin-6 (IL-6), and IL-12p40 from RAW264.7 macrophages. OMC inhibited LPS-induced production of prostaglandin E2 (PGE2) and nitric oxide (NO) through the down-regulation of expression of COX-2 and iNOS, respectively. OMC also inhibited LPS-dependent DNA-binding activity of AP-1 and NF-κB in RAW264.7 cells. Oral administration of OMC markedly suppressed secretion of TNF-α and IL-6 in mice challenged with LPS in vivo. Anti-inflammatory activity of OMC was confirmed by the inhibition of proliferation and secretion of interferon-γ (IFN-γ), IL-2, and IL-6 from concanavalin A (ConA)-stimulated mouse splenocytes. Conclusions Our study suggests that oyster mushroom possesses anti-inflammatory activities and could be considered a dietary agent against inflammation. The health benefits of the oyster mushroom warrant further clinical studies.
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Affiliation(s)
- Andrej Jedinak
- Cancer Research Laboratory, Methodist Research Institute, Indiana University Health, Indianapolis, 46202, USA
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The role of Janus kinase 2 (JAK2) activation in pneumococcal EstA protein-induced inflammatory response in RAW 264.7 macrophages. Microb Pathog 2011; 51:297-303. [PMID: 21477644 DOI: 10.1016/j.micpath.2011.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2010] [Revised: 02/05/2011] [Accepted: 02/14/2011] [Indexed: 01/18/2023]
Abstract
In a previous study, we demonstrated pneumococcal EstA-induced inflammatory response through NF-κB and MAPK-dependent pathways. Herein, we tested the hypothesis that the Janus kinase 2 (JAK2) activation and associated signaling cascades may also be involved in EstA-induced inflammatory process in RAW 264.7 macrophages. Our immunoblot analysis indicated EstA-induced activation of JAK2, with the phosphorylated protein detected from 1 to 24 h post-stimulation. As type I interferon (IFN) signaling requires the JAK/STAT pathway, we investigated EstA-induced expression of INF-α4 and INF-β by semi-quantitative and quantitative RT PCR. Our results indicated both concentration- and time-dependent increases in both IFN-α4 and IFN-β mRNA expression after EstA challenge, with the highest fold-increases observed at 4 h and 6 h post-stimulation for IFN-α4 and IFN-β mRNA, respectively. Furthermore, we applied a pharmacological approach to demonstrate the effect of JAK2 inhibition on EstA-induced nitric oxide (NO) and pro-inflammatory cytokine production. The JAK2 inhibitor AG-490 reduced significantly (P < 0.05) EstA-induced NO production and the expression of iNOS mRNA in a concentration-dependent manner. Similarly, EstA-induced IL-1β and IL-6 production and their respective mRNA expression were markedly suppressed by AG-490. However, AG-490 had no inhibitory effect on both mRNA and protein levels of TNF-α. Taken together, we demonstrate that JAK2 activation and IFN I signaling are integral parts of EstA-induced inflammatory process. Further studies will elucidate the interaction of the different signaling pathways, the specific downstream targets of JAK2, the kinetics of cytokine release, and if EstA could induce the pro-inflammatory mediators to the same extent in alveolar macrophages.
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193
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Kou X, Qi S, Dai W, Luo L, Yin Z. Arctigenin inhibits lipopolysaccharide-induced iNOS expression in RAW264.7 cells through suppressing JAK-STAT signal pathway. Int Immunopharmacol 2011; 11:1095-102. [PMID: 21426947 DOI: 10.1016/j.intimp.2011.03.005] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2010] [Revised: 03/01/2011] [Accepted: 03/08/2011] [Indexed: 12/22/2022]
Abstract
Arctigenin has been demonstrated to have an anti-inflammatory function, but the precise mechanisms of its action remain to be fully defined. In the present study, we determined the effects of arctigenin on lipopolysaccharide (LPS)-induced production of proinflammatory mediators and the underlying mechanisms involved in RAW264.7 cells. Our results indicated that arctigenin exerted its anti-inflammatory effect by inhibiting ROS-dependent STAT signaling through its antioxidant activity. Arctigenin also significantly reduced the phosphorylation of STAT1 and STAT 3 as well as JAK2 in LPS-stimulated RAW264.7 cells. The inhibitions of STAT1 and STAT 3 by arctigenin prevented their translocation to the nucleus and consequently inhibited expression of iNOS, thereby suppressing the expression of inflammation-associated genes, such as IL-1β, IL-6 and MCP-1, whose promoters contain STAT-binding elements. However, COX-2 expression was slightly inhibited at higher drug concentrations (50 μM). Our data demonstrate that arctigenin inhibits iNOS expression via suppressing JAK-STAT signaling pathway in macrophages.
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Affiliation(s)
- Xianjuan Kou
- Tongji Medical College, Huazhong University of Science and Technology, PR China
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194
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Butterbach K, Beckmann L, de Sanjosé S, Benavente Y, Becker N, Foretova L, Maynadie M, Cocco P, Staines A, Boffetta P, Brennan P, Nieters A. Association of JAK-STAT pathway related genes with lymphoma risk: results of a European case-control study (EpiLymph). Br J Haematol 2011; 153:318-33. [PMID: 21418178 DOI: 10.1111/j.1365-2141.2011.08632.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Previous studies have suggested an important role for the Janus kinase-signal transducer and activator of transcription (JAK-STAT) signalling pathway in tumour development. Therefore, we explored genetic variants in JAK-STAT pathway associated genes with lymphoma risk. In samples of the EpiLymph case-control study we genotyped 1536 single nucleotide polymorphisms (SNPs) using GoldenGate BeadArray™ Technology (Illumina, San Diego, CA, USA). Here, we report the associations between selected SNPs and haplotypes of the JAK-STAT pathway and risk of Hodgkin lymphoma (HL), B-cell non-Hodgkin lymphoma (B-NHL) and most frequent B-NHL subtypes. Among 210 relevant JAK-STAT pathway-related SNPs, polymorphisms in nine genes (BMF, IFNG, IL12A, SOCS1, STAT1, STAT3, STAT5A, STAT6, TP63) were significantly associated with lymphoma risk. At a study-wise significance level, we obtained a risk reduction of 28% among carriers of the heterozygous genotype of the STAT3 variant (rs1053023) for B-NHL. For six other variants within the STAT3 gene we observed an inverse association with different lymphoma subtypes. A reduced risk for HL was observed for the heterozygous genotype of the STAT6 SNP (rs324011). This is an explorative investigation to examine associations between JAK-STAT signalling related genes and lymphoma risk. The results implicate a relevant role of certain pathway-related genes in lymphomagenesis, but still need to be approved by independent studies.
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Affiliation(s)
- Katja Butterbach
- Division of Cancer Epidemiology, German Cancer Research Center, Heidelberg, Germany
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195
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LIU YU, PATEL SANJAY, NIBBE ROD, MAXWELL SEAN, CHOWDHURY SALIMA, KOYUTURK MEHMET, ZHU XIAOFENG, LARKIN EMMAK, BUXBAUM SARAHG, PUNJABI NARESHM, GHARIB SINAA, REDLINE SUSAN, CHANCE MARKR. Systems biology analyses of gene expression and genome wide association study data in obstructive sleep apnea. PACIFIC SYMPOSIUM ON BIOCOMPUTING. PACIFIC SYMPOSIUM ON BIOCOMPUTING 2011:14-25. [PMID: 21121029 PMCID: PMC4465214 DOI: 10.1142/9789814335058_0003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The precise molecular etiology of obstructive sleep apnea (OSA) is unknown; however recent research indicates that several interconnected aberrant pathways and molecular abnormalities are contributors to OSA. Identifying the genes and pathways associated with OSA can help to expand our understanding of the risk factors for the disease as well as provide new avenues for potential treatment. Towards these goals, we have integrated relevant high dimensional data from various sources, such as genome-wide expression data (microarray), protein-protein interaction (PPI) data and results from genome-wide association studies (GWAS) in order to define sub-network elements that connect some of the known pathways related to the disease as well as define novel regulatory modules related to OSA. Two distinct approaches are applied to identify sub-networks significantly associated with OSA. In the first case we used a biased approach based on sixty genes/proteins with known associations with sleep disorders and/or metabolic disease to seed a search using commercial software to discover networks associated with disease followed by information theoretic (mutual information) scoring of the sub-networks. In the second case we used an unbiased approach and generated an interactome constructed from publicly available gene expression profiles and PPI databases, followed by scoring of the network with p-values from GWAS data derived from OSA patients to uncover sub-networks significant for the disease phenotype. A comparison of the approaches reveals a number of proteins that have been previously known to be associated with OSA or sleep. In addition, our results indicate a novel association of Phosphoinositide 3-kinase, the STAT family of proteins and its related pathways with OSA.
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Affiliation(s)
- YU LIU
- Center for Proteomics & Bioinformatics, Case Western Reserve University (CWRU), Cleveland, Ohio, 44106, USA
| | - SANJAY PATEL
- Division of Pulmonary, Critical Care and Sleep Medicine, CWRU, Cleveland, Ohio, 44106, USA
| | - ROD NIBBE
- Center for Proteomics & Bioinformatics, CWRU, Cleveland, Ohio, 44106, USA
| | - SEAN MAXWELL
- Center for Proteomics & Bioinformatics, CWRU, Cleveland, Ohio, 44106, USA
| | - SALIM A. CHOWDHURY
- Department of Electrical Engineering & Computer Science, CWRU, Cleveland, Ohio, 44106, USA
| | - MEHMET KOYUTURK
- Department of Electrical Engineering & Computer Science, CWRU, Cleveland, Ohio, 44106, USA
| | - XIAOFENG ZHU
- Department of Epidemiology and Biostatistics, CWRU, Cleveland, Ohio, 44106, USA
| | - EMMA K. LARKIN
- Division of Allergy, Pulmonary and Critical Care, Vanderbilt University Medical Center, 1215 21st Ave S., Nashville, Tennessee, 37232, USA
| | - SARAH G BUXBAUM
- Jackson Heart Study, Jackson State University, Jackson, MS 39213, USA
| | - NARESH M. PUNJABI
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
| | - SINA A. GHARIB
- Center for Lung Biology, Division of Pulmonary and Critical Care Medicine, University of Washington, Seattle, WA 98109, USA
| | - SUSAN REDLINE
- Department of Medicine, CWRU, Cleveland, Ohio, 44106, and Depart of Medicine, Brigham & Women’s Hospital and Beth Israel Deaconess Medical School, Harvard Medical School, Boston, MA, 02115
| | - MARK R. CHANCE
- Center for Proteomics & Bioinformatics, Department of Genetics, Case Western Reserve University, Cleveland, Ohio, 44106, USA
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Greenhill CJ, Rose-John S, Lissilaa R, Ferlin W, Ernst M, Hertzog PJ, Mansell A, Jenkins BJ. IL-6 trans-signaling modulates TLR4-dependent inflammatory responses via STAT3. THE JOURNAL OF IMMUNOLOGY 2010; 186:1199-208. [PMID: 21148800 DOI: 10.4049/jimmunol.1002971] [Citation(s) in RCA: 210] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Innate immune responses triggered by the prototypical inflammatory stimulus LPS are mediated by TLR4 and involve the coordinated production of a multitude of inflammatory mediators, especially IL-6, which signals via the shared IL-6 cytokine family receptor subunit gp130. However, the exact role of IL-6, which can elicit either proinflammatory or anti-inflammatory responses, in the pathogenesis of TLR4-driven inflammatory disorders, as well as the identity of signaling pathways activated by IL-6 in a proinflammatory state, remain unclear. To define the contribution of gp130 signaling events to TLR4-driven inflammatory responses, we combined genetic and therapeutic approaches based on a series of gp130(F/F) knock-in mutant mice displaying hyperactivated IL-6-dependent JAK/STAT signaling in an experimental model of LPS/TLR4-mediated septic shock. The gp130(F/F) mice were markedly hypersensitive to LPS, which was associated with the specific upregulated production of IL-6, but not TNF-α. In gp130(F/F) mice, either genetic ablation of IL-6, Ab-mediated inhibition of IL-6R signaling or therapeutic blockade of IL-6 trans-signaling completely protected mice from LPS hypersensitivity. Furthermore, genetic reduction of STAT3 activity in gp130(F/F):Stat3(+/-) mice alleviated LPS hypersensitivity and reduced LPS-induced IL-6 production. Additional genetic approaches demonstrated that the TLR4/Mal pathway contributed to LPS hypersensitivity and increased IL-6 production in gp130(F/F) mice. Collectively, these data demonstrate for the first time, to our knowledge, that IL-6 trans-signaling via STAT3 is a critical modulator of LPS-driven proinflammatory responses through cross-talk regulation of the TLR4/Mal signaling pathway, and potentially implicate cross-talk between JAK/STAT and TLR pathways as a broader mechanism that regulates the severity of the host inflammatory response.
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Affiliation(s)
- Claire J Greenhill
- Centre for Innate Immunity and Infectious Diseases, Monash Institute of Medical Research, Monash University, Clayton, Victoria, Australia
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Huang WL, Yeh HH, Lin CC, Lai WW, Chang JY, Chang WT, Su WC. Signal transducer and activator of transcription 3 activation up-regulates interleukin-6 autocrine production: a biochemical and genetic study of established cancer cell lines and clinical isolated human cancer cells. Mol Cancer 2010; 9:309. [PMID: 21122157 PMCID: PMC3027602 DOI: 10.1186/1476-4598-9-309] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2010] [Accepted: 12/02/2010] [Indexed: 12/17/2022] Open
Abstract
Background Spontaneous interleukin-6 (IL-6) production has been observed in various tumors and implicated in the pathogenesis, progression and drug resistance in cancer. However, the regulation of IL-6 autocrine production in cancer cells is not fully understood. IL-6 is auto-regulated in many types of cell. Two of the three major downstream pathways of IL-6, MEK/extracellular signal-related kinase (Erk) pathway and phosphatidylinositol 3-kinase (PI3-K)/Akt pathway, have been shown to regulate IL-6 expression through the activation of AP-1 and NF-κB. However, it is not clear what the role of Janus kinase (Jak) 2/signal transducer and activator of transcription (Stat) 3 pathway. This study was designed to determine the role of Jak2/Stat3 pathway in the regulation of IL-6 autocrine production in cancer cells. Results Inhibitors of Jak2/Stat3, MEK/Erk and PI3-K/Akt pathways down-regulated IL-6 secretion in the lung adenocarcinoma PC14PE6/AS2 (AS2) cells, which spontaneously secreted IL-6 and possessed constitutively activated Stat3. Transfection with dominant-negative Stat3, Stat3 siRNA, or Stat3 shRNA decreased IL-6 expression in AS2 cells. Conversely, transfection with constitutively-activated Stat3 increased the production of IL-6. In AS2 derived cells, resistance to paclitaxel was positively correlated with Stat3 activation status and the expression of IL-6, which is commonly secreted in drug resistant cancer cells. The pharmacological inhibition of NF-κB, PI3-K/Akt and MEK/Erk and the pharmacological inhibition and genetic inhibition (Stat3 siRNA) of Jak2/Stat3 pathway decreased IL-6 autocrine production in various drug resistant cancer cell lines and similarly decreased IL-6 autocrine production in clinically isolated lung cancer cells. Conclusions This study is the first to directly address the role Stat3 plays on the autocrine production of IL-6, which occurs through a positive-feedback loop. Our biochemical and genetic studies clearly demonstrated that Jak2/Stat3, in combination with other IL-6 downstream pathways, contributed frequently and substantially to IL-6 autocrine production in a broad spectrum of cancer cell lines as well as in clinical cancer samples. Our findings suggest that Stat3 could potentially be regulated to suppress IL-6 autocrine production in cancer cells to inhibit the progression of cancer and reduce drug resistance.
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Affiliation(s)
- Wei-Lun Huang
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan
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198
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Wang H, Brown J, Martin M. Glycogen synthase kinase 3: a point of convergence for the host inflammatory response. Cytokine 2010; 53:130-40. [PMID: 21095632 DOI: 10.1016/j.cyto.2010.10.009] [Citation(s) in RCA: 174] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2010] [Revised: 09/29/2010] [Accepted: 10/26/2010] [Indexed: 02/07/2023]
Abstract
The phosphatidylinositol 3-kinase (PI3K) pathway has been shown to play a central role in regulating the host inflammatory response. Recent studies characterizing the downstream effector molecules within the PI3K pathway have identified that the serine/threonine kinase, glycogen synthase kinase 3 (GSK3), plays a pivotal role in regulating the production of pro- and anti-inflammatory cytokines. In innate immune cells, GSK3 inactivation augments anti-inflammatory cytokine production while concurrently suppressing the production of pro-inflammatory cytokines. The role of GSK3 in T cell biology has also been studied in detail and is involved in regulating multiple downstream signaling processes mediated by the T cell receptor (TCR), the co-stimulatory molecule CD28, and the IL-17 receptor. In vivo studies assessing the therapeutic properties of GSK3 inhibitors have shown that the inactivation of GSK3 can protect the host from immune-mediated pathology and death. This review will highlight the immunological importance GSK3 plays within different signal transduction pathways of the immune system, the cellular mechanisms regulating the activity of GSK3, the role of GSK3 in innate and adaptive immune responses, and the in vivo use of GSK3 inhibitors to treat inflammatory mediated diseases in animals.
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Affiliation(s)
- Huizhi Wang
- Department of Microbiology and Immunology, University of Louisville School of Medicine, Louisville, KY 40202, United States
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199
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Rastogi R, Du W, Ju D, Pirockinaite G, Liu Y, Nunez G, Samavati L. Dysregulation of p38 and MKP-1 in response to NOD1/TLR4 stimulation in sarcoid bronchoalveolar cells. Am J Respir Crit Care Med 2010; 183:500-10. [PMID: 20851927 DOI: 10.1164/rccm.201005-0792oc] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
RATIONALE Sarcoidosis is a systemic inflammatory disorder characterized by distinct up-regulation of Th1 cytokines, such as tumor necrosis factor (TNF)-α and IL-12. The mechanism underlying this up-regulation remains unclear. Recognition of microbial moieties through Toll-like or Nod-like receptors evokes sequential activation of mitogen-activated protein kinases (MAPKs), which plays a role in Th1-immune response. OBJECTIVES To test the hypothesis that dysregulation in MAPK signaling in response to microbial stimulation is important in mediating Th1 response in sarcoidosis. METHODS Ex vivo cultured bronchoalveolar lavage (BAL) cells isolated from patients with sarcoidosis and control subjects were stimulated with low-dose Toll-like receptor 4 (TLR4) and nucleotide-binding oligomerization domain 1 (NOD1) ligands as a model of microbial stimulation, and MAPK signaling and inflammatory response were analyzed. MEASUREMENTS AND MAIN RESULTS BAL cells from patients with sarcoidosis exhibited higher basal p38 activity, greater p38 phosphorylation, and more robust production of TNF-α and IL-12/IL-23p40 on stimulation with NOD1 and TLR4 agonists than cells isolated from control subjects. In contrast, control BAL cells had greater basal extracellular signal-regulated kinase (ERK) activity and NOD1 and TLR4 agonists preferentially activated the ERK pathway. Inhibition of p38, but not ERK, attenuated production of both IL12/IL23p40 and TNF-α. Interestingly, stimulation of cells from patients with sarcoidosis with either NOD1 or TLR4 ligand failed to induce MAPK phosphatase 1 (MKP-1). Adenovirus-mediated overexpression of MKP-1 attenuated p38 activation and decreased the production of IL12/IL23p40 and TNF-α in sarcoid BAL cells. CONCLUSIONS Our results suggest that enhanced p38 signaling in response to microbial products is caused by abnormal regulation of MKP-1 and contributes to heightened inflammation in sarcoidosis.
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Affiliation(s)
- Ruchi Rastogi
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, Wayne State University School of Medicine and Detroit Medical Center, Detroit, Michigan, USA
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Olavarría VH, Sepulcre MP, Figueroa JE, Mulero V. Prolactin-Induced Production of Reactive Oxygen Species and IL-1β in Leukocytes from the Bony Fish Gilthead Seabream Involves Jak/Stat and NF-κB Signaling Pathways. THE JOURNAL OF IMMUNOLOGY 2010; 185:3873-83. [DOI: 10.4049/jimmunol.0902306] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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