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Infante Cruz A, Coronel JV, Saibene Vélez P, Remes Lenicov F, Iturrizaga J, Abelleyro M, Rosato M, Shiromizu CM, Candolfi M, Vermeulen M, Jancic C, Yasuda E, Berner S, Villaverde MS, Salamone GV. Relevance of Thymic Stromal Lymphopoietin on the Pathogenesis of Glioblastoma: Role of the Neutrophil. Cell Mol Neurobiol 2024; 44:31. [PMID: 38557942 PMCID: PMC10984908 DOI: 10.1007/s10571-024-01462-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 02/14/2024] [Indexed: 04/04/2024]
Abstract
Glioblastoma multiforme (GBM) is the most predominant and malignant primary brain tumor in adults. Thymic stromal lymphopoietin (TSLP), a cytokine primarily generated by activated epithelial cells, has recently garnered attention in cancer research. This study was aimed to elucidate the significance of TSLP in GBM cells and its interplay with the immune system, particularly focused on granulocyte neutrophils. Our results demonstrate that the tumor produces TSLP when stimulated with epidermal growth factor (EGF) in both the U251 cell line and the GBM biopsy (GBM-b). The relevance of the TSLP function was evaluated using a 3D spheroid model. Spheroids exhibited increased diameter, volume, and proliferation. In addition, TSLP promoted the generation of satellites surrounding the main spheroids and inhibited apoptosis in U251 treated with temozolomide (TMZ). Additionally, the co-culture of polymorphonuclear (PMN) cells from healthy donors with the U251 cell line in the presence of TSLP showed a reduction in apoptosis and an increase in IL-8 production. TSLP directly inhibited apoptosis in PMN from GBM patients (PMN-p). Interestingly, the vascular endothelial growth factor (VEGF) production was elevated in PMN-p compared with PMN from healthy donors. Under these conditions, TSLP also increased VEGF production, in PMN from healthy donors. Moreover, TSLP upregulated programed death-ligand 1 (PDL-1) expression in PMN cultured with U251. On the other hand, according to our results, the analysis of RNA-seq datasets from Illumina HiSeq 2000 sequencing platform performed with TIMER2.0 webserver demonstrated that the combination of TSLP with neutrophils decreases the survival of the patient. In conclusion, our results position TSLP as a possible new growth factor in GBM and indicate its modulation of the tumor microenvironment, particularly through its interaction with PMN.
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Affiliation(s)
- Alejandra Infante Cruz
- Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina, Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - Juan Valentin Coronel
- Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina, Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - Paula Saibene Vélez
- Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina, Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Biológica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Federico Remes Lenicov
- Instituto de Investigaciones Biomédicas en Retrovirus y SIDA (INBIRS), Universidad de Buenos Aires - CONICET, Paraguay 2155, Buenos Aires, Argentina
| | - Juan Iturrizaga
- División Neurocirugía, Instituto de Investigaciones Médicas A Lanari, Universidad de Buenos Aires, Av. Combatientes de Malvinas 3150, Buenos Aires, Argentina
| | - Martín Abelleyro
- Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina, Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - Micaela Rosato
- Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina, Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
- Facultad de Ciencias Exactas y Naturales, Departamento de Química Biológica, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Carolina Maiumi Shiromizu
- Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina, Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - Marianela Candolfi
- Instituto de Investigaciones Biomédicas (INBIOMED UBA-CONICET), Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Mónica Vermeulen
- Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina, Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
| | - Carolina Jancic
- Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina, Pacheco de Melo 3081, 1425, Buenos Aires, Argentina
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ezequiel Yasuda
- Hospital de Clínicas José de San Martín, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Silvia Berner
- Servicio de Neurocirugía de la Clínica y Maternidad Santa Isabel, Buenos Aires, Argentina
| | - Marcela Solange Villaverde
- Unidad de Transferencia Genética, Área Investigación, Instituto de Oncología Ángel H. Roffo, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Gabriela Verónica Salamone
- Instituto de Medicina Experimental (IMEX-CONICET), Academia Nacional de Medicina, Pacheco de Melo 3081, 1425, Buenos Aires, Argentina.
- Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina.
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2
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Khanmohammadi S, Kuchay MS. Toll-like receptors and metabolic (dysfunction)-associated fatty liver disease. Pharmacol Res 2022; 185:106507. [DOI: 10.1016/j.phrs.2022.106507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 10/05/2022] [Accepted: 10/10/2022] [Indexed: 10/31/2022]
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3
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Effah CY, Drokow EK, Agboyibor C, Ding L, He S, Liu S, Akorli SY, Nuamah E, Sun T, Zhou X, Liu H, Xu Z, Feng F, Wu Y, Zhang X. Neutrophil-Dependent Immunity During Pulmonary Infections and Inflammations. Front Immunol 2021; 12:689866. [PMID: 34737734 PMCID: PMC8560714 DOI: 10.3389/fimmu.2021.689866] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 09/23/2021] [Indexed: 01/08/2023] Open
Abstract
Rapid recruitment of neutrophils to an inflamed site is one of the hallmarks of an effective host defense mechanism. The main pathway through which this happens is by the innate immune response. Neutrophils, which play an important part in innate immune defense, migrate into lungs through the modulation actions of chemokines to execute a variety of pro-inflammatory functions. Despite the importance of chemokines in host immunity, little has been discussed on their roles in host immunity. A holistic understanding of neutrophil recruitment, pattern recognition pathways, the roles of chemokines and the pathophysiological roles of neutrophils in host immunity may allow for new approaches in the treatment of infectious and inflammatory disease of the lung. Herein, this review aims at highlighting some of the developments in lung neutrophil-immunity by focusing on the functions and roles of CXC/CC chemokines and pattern recognition receptors in neutrophil immunity during pulmonary inflammations. The pathophysiological roles of neutrophils in COVID-19 and thromboembolism have also been summarized. We finally summarized various neutrophil biomarkers that can be utilized as prognostic molecules in pulmonary inflammations and discussed various neutrophil-targeted therapies for neutrophil-driven pulmonary inflammatory diseases.
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Affiliation(s)
| | - Emmanuel Kwateng Drokow
- Department of Radiation Oncology, Zhengzhou University People’s Hospital & Henan Provincial People’s Hospital, Zhengzhou, China
| | - Clement Agboyibor
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, China
| | - Lihua Ding
- College of Public Health, Zhengzhou University, Zhengzhou, China
| | - Sitian He
- College of Public Health, Zhengzhou University, Zhengzhou, China
| | - Shaohua Liu
- General ICU, Henan Key Laboratory of Critical Care Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Senyo Yao Akorli
- College of Agriculture and Natural Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Emmanuel Nuamah
- College of Agriculture and Natural Sciences, University of Cape Coast, Cape Coast, Ghana
| | - Tongwen Sun
- General ICU, Henan Key Laboratory of Critical Care Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xiaolei Zhou
- Department of Respiratory, Henan Provincial Chest Hospital, Zhengzhou, China
| | - Hong Liu
- Department of Respiratory, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Zhiwei Xu
- Department of Respiratory and Critical Care Medicine, People’s Hospital of Zhengzhou University & Henan Provincial People’s Hospital, Zhengzhou, China
| | - Feifei Feng
- College of Public Health, Zhengzhou University, Zhengzhou, China
| | - Yongjun Wu
- College of Public Health, Zhengzhou University, Zhengzhou, China
| | - Xiaoju Zhang
- Department of Respiratory and Critical Care Medicine, People’s Hospital of Zhengzhou University & Henan Provincial People’s Hospital, Zhengzhou, China
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4
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Ledo C, Gonzalez CD, Garofalo A, Sabbione F, Keitelman IA, Giai C, Stella I, Trevani AS, Gómez MI. Protein A Modulates Neutrophil and Keratinocyte Signaling and Survival in Response to Staphylococcus aureus. Front Immunol 2021; 11:524180. [PMID: 33692774 PMCID: PMC7937904 DOI: 10.3389/fimmu.2020.524180] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Accepted: 12/29/2020] [Indexed: 01/18/2023] Open
Abstract
The type 1 TNF-α receptor (TNFR1) has a central role in initiating both pro-inflammatory and pro-apoptotic signaling cascades in neutrophils. Considering that TNFR1 signals Staphylococcus aureus protein A (SpA), the aim of this study was to explore the interaction of this bacterial surface protein with neutrophils and keratinocytes to underscore the signaling pathways that may determine the fate of these innate immune cells in the infected tissue during staphylococcal skin infections. Using human neutrophils cultured in vitro and isogenic staphylococcal strains expressing or not protein A, we demonstrated that SpA is a potent inducer of IL-8 in neutrophils and that the induction of this chemokine is dependent on the SpA-TNFR1 interaction and p38 activation. In addition to IL-8, protein A induced the expression of TNF-α and MIP-1α highlighting the importance of SpA in the amplification of the inflammatory response. Protein A contributed to reduce neutrophil mortality prolonging their lifespan upon the encounter with S. aureus. Signaling initiated by SpA modulated the type of neutrophil cell death in vitro and during skin and soft tissue infections (SSTI) in vivo triggering the apoptotic pathway instead of necrosis. Moreover, SpA induced pro-inflammatory cytokines in keratinocytes, modulating their survival in vitro and preventing the exacerbated necrosis and ulceration of the epithelium during SSTI in vivo. Taken together, these results highlight the importance of the inflammatory signaling induced by protein A in neutrophils and skin epithelial cells. The ability of protein A to modulate the neutrophil/epithelial cell death program in the skin is of clinical relevance considering that lysis of neutrophils and epithelial cells will promote an intense inflammatory response and contribute to tissue damage, a non-desirable feature of complicated SSTI.
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Affiliation(s)
- Camila Ledo
- Centro de Estudios Biomédicos, Aplicados y Desarrollo (CEBBAD), Departamento de Ciencias Biológicas y Biomédicas, Universidad Maimonides, Buenos Aires, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - Cintia D Gonzalez
- Instituto de investigaciones en Microbiología y Parasitología Médica (IMPaM), Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ailin Garofalo
- Instituto de investigaciones en Microbiología y Parasitología Médica (IMPaM), Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Florencia Sabbione
- Departamento de Inmunología, Instituto de Medicina Experimental (IMEX)-CONICET, Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Irene A Keitelman
- Departamento de Inmunología, Instituto de Medicina Experimental (IMEX)-CONICET, Academia Nacional de Medicina, Buenos Aires, Argentina
| | - Constanza Giai
- Instituto de investigaciones en Microbiología y Parasitología Médica (IMPaM), Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Inés Stella
- Facultad de Ciencias de la Salud, Universidad Maimónides, Buenos Aires, Argentina
| | - Analía S Trevani
- Departamento de Inmunología, Instituto de Medicina Experimental (IMEX)-CONICET, Academia Nacional de Medicina, Buenos Aires, Argentina.,Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Marisa I Gómez
- Centro de Estudios Biomédicos, Aplicados y Desarrollo (CEBBAD), Departamento de Ciencias Biológicas y Biomédicas, Universidad Maimonides, Buenos Aires, Argentina.,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.,Departamento de Microbiología, Parasitología e Inmunología, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
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5
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Varga Z, Rácz E, Mázló A, Korodi M, Szabó A, Molnár T, Szöőr Á, Veréb Z, Bácsi A, Koncz G. Cytotoxic activity of human dendritic cells induces RIPK1-dependent cell death. Immunobiology 2020; 226:152032. [PMID: 33316542 DOI: 10.1016/j.imbio.2020.152032] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 10/05/2020] [Accepted: 11/18/2020] [Indexed: 02/05/2023]
Abstract
Dendritic cells (DCs), as potent phagocytes engulf dead cells and present peptide fragments of tumor antigens or pathogens derived from infected cells to naïve CD8+ T-lymphocytes. Dendritic cells can also induce apoptosis in target cells, thus getting an opportunity to sample their microenvironment. Here, we present that the supernatants of LPS- or CL075-activated DCs induced cell death in different cell lines, but during the differentiation to mature DCs, they lost their cytotoxic potential. Dexamethasone-pre-treated tolerogenic DCs induced less intensive death indicating that the tissue microenvironment can downregulate DC-mediated killing. Exploring the signaling of DC-induced cell death, we observed that the supernatant of activated DCs induced TNF-dependent cell death, since TNF antagonist blocked the cytotoxic activity of DCs, contrary to inhibitors of Fas and TRAIL receptors. We identified that the DC-induced killing is at least partially a RIPK1-dependent process, as RIPK1 positive target cells were more susceptible to DC-induced cell death than their RIPK1 deficient counterparts. Moreover, both the elevated phosphorylation of RIPK1 and the increase in RIPK1-caspase-8 interaction in target cells suggest that RIPK1-mediated signals contribute to DC supernatant-induced cell death. We also proved that the cytotoxic activity of DC-derived supernatant induced apoptosis in the target cells and not necroptosis, as it was completely abrogated with the pan caspase inhibitor (Z-VAD), while the necroptosis inhibitor (Nec-1) had no effect. Our work revealed that the supernatant of activated DCs induces the apoptosis of target cells in a RIPK1-dependent manner. This phenomenon could be relevant for the initiation of cross-presentation and may broaden the plethora of cytotoxic mechanisms acting against tumor cells.
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Affiliation(s)
- Zsófia Varga
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; University of Debrecen, Doctoral School of Molecular Cellular and Immune Biology, Debrecen, Hungary
| | - Evelin Rácz
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Anett Mázló
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; University of Debrecen, Doctoral School of Molecular Cellular and Immune Biology, Debrecen, Hungary
| | - Mónika Korodi
- University of Pécs, Doctoral School of Chemistry, Department of Chemistry, Faculty of Sciences, Pécs, Hungary
| | - Anikó Szabó
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Tamás Molnár
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary; University of Debrecen, Doctoral School of Molecular Cellular and Immune Biology, Debrecen, Hungary
| | - Árpád Szöőr
- Department of Biophysics and Cell Biology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Zoltán Veréb
- Regenerative Medicine and Cellular Pharmacology Laboratory (HECRIN), Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary; Institute for Translational Medicine, University of Szeged, Szeged, Hungary
| | - Attila Bácsi
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Gábor Koncz
- Department of Immunology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.
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6
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Singh VK, Seed TM. Entolimod as a radiation countermeasure for acute radiation syndrome. Drug Discov Today 2020; 26:17-30. [PMID: 33065293 DOI: 10.1016/j.drudis.2020.10.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 09/12/2020] [Accepted: 10/05/2020] [Indexed: 01/11/2023]
Abstract
High doses of total-body or partial-body radiation exposure can result in a life-threatening acute radiation syndrome as manifested by severe morbidity. Entolimod (CBLB502) is effective in protecting against, and mitigating the development of, the hematopoietic and gastrointestinal subsyndromes of the acute radiation syndrome in rodents and nonhuman primates. Entolimod treatment reduces radiation-induced apoptosis and accelerates the regeneration of progenitors in radiation-damaged tissues. The drug has been evaluated clinically for its pharmacokinetics (PK), toxicity, and biomarkers. The US Food and Drug Administration (FDA) has granted investigational new drug, fast-track, and orphan drug statuses to entolimod. Its safety, efficacy, and animal-to-human dose conversion data allowed its progression with a pre-emergency use authorization application submission.
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Affiliation(s)
- Vijay K Singh
- Division of Radioprotectants, Department of Pharmacology and Molecular Therapeutics, F. Edward Hébert School of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA; Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA.
| | - Thomas M Seed
- Tech Micro Services, 4417 Maple Avenue, Bethesda, MD 20814, USA
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7
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Functional Toll-Like Receptors (TLRs) Are Expressed by a Majority of Primary Human Acute Myeloid Leukemia Cells and Inducibility of the TLR Signaling Pathway Is Associated with a More Favorable Phenotype. Cancers (Basel) 2019; 11:cancers11070973. [PMID: 31336716 PMCID: PMC6678780 DOI: 10.3390/cancers11070973] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 06/26/2019] [Accepted: 07/09/2019] [Indexed: 02/06/2023] Open
Abstract
Acute myeloid leukemia (AML) is a highly heterogeneous disease with regard to biological characteristics and receptor expression. Toll-like receptors (TLRs) are upstream to the transcription factor NFκB and part of the innate immune system. They are differentially expressed on AML blasts, and during normal hematopoiesis they initiate myeloid differentiation. In this study, we investigated the response upon TLR stimulation in an AML cohort (n = 83) by measuring the increase of NFκB-mediated cytokine secretion. We observed that TLR4 is readily induced in most patients, while TLR1/2 response was more restricted. General response to TLR stimulation correlated with presence of nucleophosmin gene mutations, increased mRNA expression of proteins, which are part of the TLR signaling pathway and reduced expression of transcription-related proteins. Furthermore, signaling via TLR1/2 appeared to be linked with prolonged patient survival. In conclusion, response upon TLR stimulation, and especially TLR1/2 induction, seems to be part of a more favorable phenotype, which also is characterized by higher basal cytokine secretion and a more mature blast population.
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8
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Long noncoding RNA MALAT1 regulates sepsis in patients with burns by modulating miR‑214 with TLR5. Mol Med Rep 2019; 19:3756-3766. [PMID: 30896848 DOI: 10.3892/mmr.2019.10028] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Accepted: 01/21/2019] [Indexed: 11/05/2022] Open
Abstract
The present study aimed to identify the involvement of the dysregulation of the metastasis‑associated lung adenocarcinoma transcript‑1 (MALAT1)/microRNA (miR)‑214/Toll‑like receptor (TLR)5 signaling pathway in the development of post‑burn sepsis. THP‑1 cells were used in the present study, in addition to 8‑10 week‑old mice. ELISA analysis was performed to examine the expression levels of inflammation‑associated factors. Reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR) analysis and western blotting were performed to analyze the influence of burns or burns with infection on the production of MALAT1, miR‑214 and TLR5. Commonly‑used software and a luciferase assay was used to confirm the target gene of miR‑214. RT‑qPCR analysis and western blotting were performed to elucidate the effects of lipopolysaccharide (LPS), miR‑214 and MALAT1 on the expression of miR‑214, TLR5, tumor necrosis factor (TNF)‑α, interleukin (IL)‑6 and IL‑10. Burn injury increased TLR5, TNF‑α, IL‑6 and IL‑10 expression levels, which were abolished by treatment with MALAT1. miR‑214 directly targeted TLR5 by binding to the TLR5 3' untranslated region (ITR), and the luciferase activity of the wild‑type, and not the mutant, TLR5 3'UTR was reduced following transfection with miR‑214. In cells not treated with LPS, MALAT1 and anti‑miR‑214 significantly enhanced TLR5, TNF‑α, IL‑6 and IL‑10 expression, and repressed miR‑214 production; whereas, miR‑214 and MALAT1 short hairpin (sh)RNA decreased TLR5, TNF‑α, IL‑6 and IL‑10 expression levels, and increased miR‑214 expression. In cells treated with LPS, LPS reduced miR‑214 expression and increased TLR5, TNF‑α, IL‑6 and IL‑10 expression compared with LPS‑untreated cells, and the effects of MALAT1, anti‑miR‑214, miR‑214 and MALAT1 shRNA on TLR5, TNF‑α, IL‑6 and IL‑10 were the same as in LPS‑untreated cell. The results of the present study indicated the association between the dysregulation of MALAT1/miR‑214/TLR5 and the risk of post‑burn sepsis.
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9
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Golenkina EA, Viryasova GM, Galkina SI, Arifulin EA, Gaponova TV, Romanova YM, Sud'ina GF. Synthetic CpG oligonucleotides as potential modulators of neutrophil survival in PAMP-associated inhibition of apoptosis. J Leukoc Biol 2019; 106:45-55. [PMID: 30835888 DOI: 10.1002/jlb.3mia1118-435r] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 01/25/2019] [Accepted: 02/07/2019] [Indexed: 12/21/2022] Open
Abstract
We studied the effects of a synthetic CpG oligonucleotide (CpG ODN2006) on polymorphonuclear leukocyte (PMNL, neutrophil) survival and oxidant status. CpG ODN2006 showed a dose-dependent effect on the apoptosis of resting neutrophils. Without affecting the viability of resting cells, low concentrations of CpG ODN2006 interfered with Salmonella typhimurium-mediated viability prolongation and increased neutrophil apoptosis to control levels. CpG ODN2006 stimulated neutrophil apoptosis by enhancing ROS generation. Even small doses of ODN could induce the production of intracellular superoxide anions. The high superoxide reactogenicity, including with respect to nitrogen oxide, led to increased levels of intracellular ROS and RNS, which ultimately caused apoptosis. The pro-oxidant effect of low concentrations of CpG ODN2006 was not sufficient to trigger irreversible pro-apoptotic mechanisms. However, the sensitivity of PMNLs to ODN2006, a modulator of apoptosis, increased significantly under conditions of infectious inflammation. Inactivated S. typhimurium proved to be suitable for simulating inflammatory conditions in vitro.
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Affiliation(s)
- Ekaterina A Golenkina
- Lomonosov Moscow State University, Belozersky Institute of Physico-Chemical Biology, Moscow, Russia
| | - Galina M Viryasova
- Lomonosov Moscow State University, Belozersky Institute of Physico-Chemical Biology, Moscow, Russia
| | - Svetlana I Galkina
- Lomonosov Moscow State University, Belozersky Institute of Physico-Chemical Biology, Moscow, Russia
| | - Evgenii A Arifulin
- Lomonosov Moscow State University, Belozersky Institute of Physico-Chemical Biology, Moscow, Russia
| | - Tatjana V Gaponova
- FGBU Hematology Research Centre, Russia Federation Ministry of Public Health, Moscow, Russia
| | - Yulia M Romanova
- Gamaleya National Research Centre of Epidemiology and Microbiology, Moscow, Russia.,Department of Unfectology and Virology, I.M.Sechenov First Moscow State Medical University, Moscow, Russia
| | - Galina F Sud'ina
- Lomonosov Moscow State University, Belozersky Institute of Physico-Chemical Biology, Moscow, Russia
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10
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Quan Y, Song K, Zhang Y, Zhu C, Shen Z, Wu S, Luo W, Tan B, Yang Z, Wang X. Roseburia intestinalis-derived flagellin is a negative regulator of intestinal inflammation. Biochem Biophys Res Commun 2018; 501:791-799. [PMID: 29772233 DOI: 10.1016/j.bbrc.2018.05.075] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 05/13/2018] [Indexed: 01/26/2023]
Abstract
Our previous study showed that the Roseburia intestinalis (R. intestinalis), one of the dominant intestinal bacterial microbiota, was significantly decreased in Crohn's disease patients and protected colon epithelial cells from inflammatory damage. However, the roles of lncRNAs in R. intestinalis flagellin-mediated anti-inflammation remain unclear. In this study, we investigate global lncRNA expression profiles using microarray analysis of ulcerative colitis samples from DSS/Flagellin-challenged mice and identified a Flagellin-induced upregulated lncRNA (HIF1A-AS2). Flagellin induced HIF1A-AS2 expression in a dose- and time-dependent manner via p38-stat1 activation. Selective pharmacological inhibitors of Stat1 and p38, and genetic knockdown of these genes abolished Flagellin-induced HIF1A-AS2 expression. In addition, luciferase reporter assay showed that Flagellin activated HIF1A-AS2 promotor via increasing stat1 phosphorylation. Silencing of HIF1A-AS2 abolished Flagellin-mediated anti-inflammatory effects, evaluating by upregulation of cytokines expression, including TNF-α, IL-1β, IL-6 and IL-12, but not TNFβ. In addition, knockdown of HIF1A-AS2 significantly increased p65 and Jnk phosphorylation, and sufficiently abolished Flagellin-mediated anti-inflammatory affects in vivo. Our study provides new insights into the mechanisms that lncRNAs regulate flagellin-mediated alleviation of colonic inflammation. It is indicated that HIF1A-AS2 may be a modulator of intestinal inflammation and represent a novel target for future therapeutics.
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Affiliation(s)
- Yongsheng Quan
- Department of Gastroenterology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China; Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Changsha, Hunan, China
| | - Kerui Song
- School of Materials Science and Engineering, Central South University, Changsha, Hunan, China
| | - Yan Zhang
- Department of Ultrasound, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Changxin Zhu
- Department of Gastroenterology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China; Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Changsha, Hunan, China
| | - Zhaohua Shen
- Department of Gastroenterology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China; Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Changsha, Hunan, China
| | - Shuai Wu
- Department of Gastroenterology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China; Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Changsha, Hunan, China
| | - Weiwei Luo
- Department of Gastroenterology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China; Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Changsha, Hunan, China
| | - Bei Tan
- Department of Gastroenterology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China; Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Changsha, Hunan, China
| | - Zhenyu Yang
- Department of Gastroenterology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China
| | - Xiaoyan Wang
- Department of Gastroenterology, The Third Xiangya Hospital of Central South University, Changsha, Hunan, China; Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Changsha, Hunan, China.
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11
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Hancz D, Szabo A, Molnar T, Varga Z, Hancz A, Gregus A, Hueber AO, Rajnavolgyi E, Koncz G. Flagellin increases death receptor-mediated cell death in a RIP1-dependent manner. Immunol Lett 2018; 193:42-50. [DOI: 10.1016/j.imlet.2017.11.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 10/18/2017] [Accepted: 11/20/2017] [Indexed: 12/26/2022]
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Jeong J, Kim S, Lim DS, Kim SH, Doh H, Kim SD, Song YS. TLR5 Activation through NF-κB Is a Neuroprotective Mechanism of Postconditioning after Cerebral Ischemia in Mice. Exp Neurobiol 2017; 26:213-226. [PMID: 28912644 PMCID: PMC5597552 DOI: 10.5607/en.2017.26.4.213] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Revised: 07/22/2017] [Accepted: 08/18/2017] [Indexed: 12/24/2022] Open
Abstract
Postconditioning has been shown to protect the mouse brain from ischemic injury. However, the neuroprotective mechanisms of postconditioning remain elusive. We have found that toll-like receptor 5 (TLR5) plays an integral role in postconditioning-induced neuroprotection through Akt/nuclear factor kappa B (NF-κB) activation in cerebral ischemia. Compared to animals that received 30 min of transient middle cerebral artery occlusion (tMCAO) group, animals that also underwent postconditioning showed a significant reduction of up to 60.51% in infarct volume. Postconditioning increased phospho-Akt (p-Akt) levels and NF-κB translocation to the nucleus as early as 1 h after tMCAO and oxygen-glucose deprivation. Furthermore, inhibition of Akt by Akt inhibitor IV decreased NF-κB promoter activity after postconditioning. Immunoprecipitation showed that interactions between TLR5, MyD88, and p-Akt were increased from postconditioning both in vivo and in vitro. Similar to postconditioning, flagellin, an agonist of TLR5, increased NF-κB nuclear translocation and Akt phosphorylation. Our results suggest that postconditioning has neuroprotective effects by activating NF-κB and Akt survival pathways via TLR5 after cerebral ischemia. Additionally, the TLR5 agonist flagellin can simulate the neuroprotective mechanism of postconditioning in cerebral ischemia.
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Affiliation(s)
- Jaewon Jeong
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Korea
| | - Soojin Kim
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Korea
| | - Da-Sol Lim
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Korea
| | - Seo-Hea Kim
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Korea
| | - Heeju Doh
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Korea
| | - So-Dam Kim
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Korea
| | - Yun Seon Song
- College of Pharmacy, Sookmyung Women's University, Seoul 04310, Korea
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Miralda I, Uriarte SM, McLeish KR. Multiple Phenotypic Changes Define Neutrophil Priming. Front Cell Infect Microbiol 2017; 7:217. [PMID: 28611952 PMCID: PMC5447094 DOI: 10.3389/fcimb.2017.00217] [Citation(s) in RCA: 120] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Accepted: 05/11/2017] [Indexed: 12/15/2022] Open
Abstract
Exposure to pro-inflammatory cytokines, chemokines, mitochondrial contents, and bacterial and viral products induces neutrophils to transition from a basal state into a primed one, which is currently defined as an enhanced response to activating stimuli. Although, typically associated with enhanced generation of reactive oxygen species (ROS) by the NADPH oxidase, primed neutrophils show enhanced responsiveness of exocytosis, NET formation, and chemotaxis. Phenotypic changes associated with priming also include activation of a subset of functions, including adhesion, transcription, metabolism, and rate of apoptosis. This review summarizes the breadth of phenotypic changes associated with priming and reviews current knowledge of the molecular mechanisms behind those changes. We conclude that the current definition of priming is too restrictive. Priming represents a combination of enhanced responsiveness and activated functions that regulate both adaptive and innate immune responses.
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Affiliation(s)
- Irina Miralda
- Department of Microbiology, University of Louisville School of MedicineLouisville, KY, United States
| | - Silvia M Uriarte
- Department of Microbiology, University of Louisville School of MedicineLouisville, KY, United States.,Department of Medicine, University of Louisville School of MedicineLouisville, KY, United States
| | - Kenneth R McLeish
- Department of Medicine, University of Louisville School of MedicineLouisville, KY, United States.,Robley Rex VA Medical CenterLouisville, KY, United States
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Etienne-Mesmin L, Vijay-Kumar M, Gewirtz AT, Chassaing B. Hepatocyte Toll-Like Receptor 5 Promotes Bacterial Clearance and Protects Mice Against High-Fat Diet-Induced Liver Disease. Cell Mol Gastroenterol Hepatol 2016; 2:584-604. [PMID: 28090564 PMCID: PMC5042709 DOI: 10.1016/j.jcmgh.2016.04.007] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 04/25/2016] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS Innate immune dysfunction can promote chronic inflammatory diseases of the liver. For example, mice lacking the flagellin receptor Toll-like receptor 5 (TLR5) show microbial dysbiosis and predisposition to high-fat diet (HFD)-induced hepatic steatosis. The extent to which hepatocytes play a direct role in detecting bacterial products in general, or flagellin in particular, is poorly understood. In the present study, we investigated the role of hepatocyte TLR5 in recognizing flagellin, policing bacteria, and protecting against liver disease. METHODS Mice were engineered to lack TLR5 specifically in hepatocytes (TLR5ΔHep) and analyzed relative to sibling controls (TLR5fl/fl). TLR5 messenger RNA levels, responses to exogenous flagellin, elimination of circulating motile bacteria, and susceptibility of liver injury (concanavalin A, carbon tetrachloride, methionine- and choline-deficient diet, and HFD) were measured. RESULTS TLR5ΔHep expressed similar levels of TLR5 as TLR5fl/fl in all organs examined, except in the liver, which showed a 90% reduction in TLR5 levels, indicating that hepatocytes accounted for the major portion of TLR5 expression in this organ. TLR5ΔHep showed impairment in responding to purified flagellin and clearing flagellated bacteria from the liver. Although TLR5ΔHep mice did not differ markedly from sibling controls in concanavalin A or carbon tetrachloride-induced liver injury models, they showed exacerbated disease in response to a methionine- and choline-deficient diet and HFD. Such predisposition of TLR5ΔHep to diet-induced liver pathology was associated with increased expression of proinflammatory cytokines, which was dependent on the Nod-like-receptor C4 inflammasome and rescued by microbiota ablation. CONCLUSIONS Hepatocyte TLR5 plays a critical role in protecting liver against circulating gut bacteria and against diet-induced liver disease.
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Key Words
- ALT, alanine aminotransferase
- AST, aspartate aminotransferase
- CCL4, carbon tetrachloride
- CFU, colony-forming unit
- CXCL, chemokine (C-X-C motif) ligand 1
- ConA, concanavalin A
- DC, dendritic cell
- HFD, high-fat diet
- Hep, hepatocyte
- Hepatocytes
- IEC, intestinal epithelial cell
- IL, interleukin
- Inflammation
- Innate Immunity
- KO, knock-out
- LPS, lipopolysaccharide
- MCD, methionine- and choline-deficient diet
- NAFLD, nonalcoholic fatty liver disease
- NASH, nonalcoholic steatohepatitis
- NLR, nod-like receptor
- NPC, nonparenchymal cell
- PBS, phosphate-buffered saline
- RT-PCR, reverse-transcription polymerase chain reaction
- Steatosis
- TLR, Toll-like receptor
- TLR5
- WT, wild-type
- mRNA, messenger RNA
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Affiliation(s)
- Lucie Etienne-Mesmin
- Center for Inflammation Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia
| | - Matam Vijay-Kumar
- Department of Nutritional Sciences and Medicine, Pennsylvania State University, University Park, Pennsylvania
| | - Andrew T. Gewirtz
- Center for Inflammation Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia
| | - Benoit Chassaing
- Center for Inflammation Immunity and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia,Correspondence Address correspondence to: Benoit Chassaing, PhD, Center for Inflammation, Immunity, and Infection, Institute for Biomedical Sciences, Georgia State University, Atlanta, Georgia 30303. fax: (404) 413–3580.Center for InflammationImmunity, and InfectionInstitute for Biomedical SciencesGeorgia State UniversityAtlantaGeorgia 30303
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Mycoplasma bovis isolates recovered from cattle and bison (Bison bison) show differential in vitro effects on PBMC proliferation, alveolar macrophage apoptosis and invasion of epithelial and immune cells. Vet Microbiol 2016; 186:28-36. [PMID: 27016754 DOI: 10.1016/j.vetmic.2016.02.016] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Revised: 02/19/2016] [Accepted: 02/21/2016] [Indexed: 12/13/2022]
Abstract
In the last few years, several outbreaks of pneumonia, systemically disseminated infection, and high mortality associated with Mycoplasma bovis (M. bovis) in North American bison (Bison bison) have been reported in Alberta, Manitoba, Saskatchewan, Nebraska, New Mexico, Montana, North Dakota, and Kansas. M. bovis causes Chronic Pneumonia and Polyarthritis Syndrome (CPPS) in young, stressed calves in intensively-managed feedlots. M. bovis is not classified as a primary pathogen in cattle, but in bison it appears to be a primary causative agent with rapid progression of disease with fatal outcomes and an average 20% mature herd mortality. Thus, there is a possibility that M. bovis isolates from cattle and bison differ in their pathogenicity. Hence, we decided to compare selected cattle isolates to several bison isolates obtained from clinical cases. We show differences in modulation of PBMC proliferation, invasion of trachea and lung epithelial cells, along with modulation of apoptosis and survival in alveolar macrophages. We concluded that some bison isolates showed less inhibition of cattle and bison PBMC proliferation, were not able to suppress alveolar macrophage apoptosis as efficiently as cattle isolates, and were more or less invasive than the cattle isolate in various cells. These findings provide evidence about the differential properties of M. bovis isolated from the two species and has helped in the selection of bison isolates for genomic sequencing.
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Tan X, Wei LJ, Fan GJ, Jiang YN, Yu XP. Effector responses of bovine blood neutrophils against Escherichia coli: Role of NOD1/NF-κB signalling pathway. Vet Immunol Immunopathol 2015; 168:68-76. [DOI: 10.1016/j.vetimm.2015.08.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Revised: 07/07/2015] [Accepted: 08/14/2015] [Indexed: 01/26/2023]
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17
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Krivokrysenko VI, Toshkov IA, Gleiberman AS, Krasnov P, Shyshynova I, Bespalov I, Maitra RK, Narizhneva NV, Singh VK, Whitnall MH, Purmal AA, Shakhov AN, Gudkov AV, Feinstein E. The Toll-Like Receptor 5 Agonist Entolimod Mitigates Lethal Acute Radiation Syndrome in Non-Human Primates. PLoS One 2015; 10:e0135388. [PMID: 26367124 PMCID: PMC4569586 DOI: 10.1371/journal.pone.0135388] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 07/15/2015] [Indexed: 12/28/2022] Open
Abstract
There are currently no approved medical radiation countermeasures (MRC) to reduce the lethality of high-dose total body ionizing irradiation expected in nuclear emergencies. An ideal MRC would be effective even when administered well after radiation exposure and would counteract the effects of irradiation on the hematopoietic system and gastrointestinal tract that contribute to its lethality. Entolimod is a Toll-like receptor 5 agonist with demonstrated radioprotective/mitigative activity in rodents and radioprotective activity in non-human primates. Here, we report data from several exploratory studies conducted in lethally irradiated non-human primates (rhesus macaques) treated with a single intramuscular injection of entolimod (in the absence of intensive individualized supportive care) administered in a mitigative regimen, 1-48 hours after irradiation. Following exposure to LD50-70/40 of radiation, injection of efficacious doses of entolimod administered as late as 25 hours thereafter reduced the risk of mortality 2-3-fold, providing a statistically significant (P<0.01) absolute survival advantage of 40-60% compared to vehicle treatment. Similar magnitude of survival improvement was also achieved with drug delivered 48 hours after irradiation. Improved survival was accompanied by predominantly significant (P<0.05) effects of entolimod administration on accelerated morphological recovery of hematopoietic and immune system organs, decreased severity and duration of thrombocytopenia, anemia and neutropenia, and increased clonogenic potential of the bone marrow compared to control irradiated animals. Entolimod treatment also led to reduced apoptosis and accelerated crypt regeneration in the gastrointestinal tract. Together, these data indicate that entolimod is a highly promising potential life-saving treatment for victims of radiation disasters.
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Affiliation(s)
| | - Ilia A. Toshkov
- Cleveland BioLabs, Inc. (CBLI), Buffalo, New York, United States of America
| | | | - Peter Krasnov
- Cleveland BioLabs, Inc. (CBLI), Buffalo, New York, United States of America
| | - Inna Shyshynova
- Cleveland BioLabs, Inc. (CBLI), Buffalo, New York, United States of America
| | - Ivan Bespalov
- Cleveland BioLabs, Inc. (CBLI), Buffalo, New York, United States of America
| | - Ratan K. Maitra
- Cleveland BioLabs, Inc. (CBLI), Buffalo, New York, United States of America
| | | | - Vijay K. Singh
- Armed Forces Radiobiology Research Institute (AFRRI), Bethesda, Maryland, United States of America
| | - Mark H. Whitnall
- Armed Forces Radiobiology Research Institute (AFRRI), Bethesda, Maryland, United States of America
| | - Andrei A. Purmal
- Cleveland BioLabs, Inc. (CBLI), Buffalo, New York, United States of America
| | | | - Andrei V. Gudkov
- Cleveland BioLabs, Inc. (CBLI), Buffalo, New York, United States of America
- Department of Cell Stress Biology, Roswell Park Cancer Institute (RPCI), Buffalo, New York, United States of America
- * E-mail: (AVG); (EF)
| | - Elena Feinstein
- Cleveland BioLabs, Inc. (CBLI), Buffalo, New York, United States of America
- * E-mail: (AVG); (EF)
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Domingos-Pereira S, Hojeij R, Reggi E, Derré L, Chevalier MF, Romero P, Jichlinski P, Nardelli-Haefliger D. Local Salmonella immunostimulation recruits vaccine-specific CD8 T cells and increases regression of bladder tumor. Oncoimmunology 2015; 4:e1016697. [PMID: 26140240 DOI: 10.1080/2162402x.2015.1016697] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 02/02/2015] [Accepted: 02/03/2015] [Indexed: 12/13/2022] Open
Abstract
The efficacy of antitumoral responses can be increased using combinatorial vaccine strategies. We recently showed that vaccination could be optimized by local administration of diverse molecular or bacterial agents to target and augment antitumoral CD8 T cells in the genital mucosa (GM) and increase regression of cervical cancer in an animal model. Non muscle-invasive bladder cancer is another disease that is easily amenable to local therapies. In contrast to data obtained in the GM, in this study we show that intravesical (IVES) instillation of synthetic toll-like receptor (TLR) agonists only modestly induced recruitment of CD8 T cells to the bladder. However, IVES administration of Ty21a, a live bacterial vaccine against typhoid fever, was much more effective and increased the number of total and vaccine-specific CD8 T cells in the bladder approximately 10 fold. Comparison of chemokines induced in the bladder by either CpG (a TLR-9 agonist) or Ty21a highlighted the preferential increase in complement component 5a, CXCL5, CXCL2, CCL8, and CCL5 by Ty21a, suggesting their involvement in the attraction of T cells to the bladder. IVES treatment with Ty21a after vaccination also significantly increased tumor regression compared to vaccination alone, resulting in 90% survival in an orthotopic murine model of bladder cancer expressing a prototype tumor antigen. Our data demonstrate that combining vaccination with local immunostimulation may be an effective treatment strategy for different types of cancer and also highlight the great potential of the Ty21a vaccine, which is routinely used worldwide, in such combinatorial therapies.
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Key Words
- BCG, Bacillus Calmette Guerin
- BMDC, bone marrow-derived dendritic cell
- C5a, complement component 5a
- ESL, E-selectin ligands
- GM, genital mucosa
- IVAG, intravaginal
- IVES, intravesical
- NMIBC, non-muscle invasive bladder cancer
- PBS, phosphate buffered saline
- PE, phycoerythrin
- PIC, poly (I:C)
- SEM, standard error of the mean
- Salmonella Ty21a
- TLR, toll-like receptor
- TUR, transurethral resection
- bacterial immunostimulant
- bladder cancer
- combinatorial therapy
- s.c., subcutaneously
- therapeutic vaccination
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Affiliation(s)
| | - Rim Hojeij
- Dept. Urology; Lausanne University Hospital (CHUV); Lausanne, Switzerland
| | - Erica Reggi
- Dept. Urology; Lausanne University Hospital (CHUV); Lausanne, Switzerland
| | - Laurent Derré
- Dept. Urology; Lausanne University Hospital (CHUV); Lausanne, Switzerland
| | | | - Pedro Romero
- Ludwig Center for Cancer Research of University of Lausanne ; Lausanne, Switzerland
| | - Patrice Jichlinski
- Dept. Urology; Lausanne University Hospital (CHUV); Lausanne, Switzerland
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Allaeys I, Gymninova I, Canet-Jourdan C, Poubelle PE. IL-32γ delays spontaneous apoptosis of human neutrophils through MCL-1, regulated primarily by the p38 MAPK pathway. PLoS One 2014; 9:e109256. [PMID: 25275312 PMCID: PMC4183585 DOI: 10.1371/journal.pone.0109256] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2014] [Accepted: 09/09/2014] [Indexed: 12/21/2022] Open
Abstract
IL-32γ is a multifunctional cytokine involved in various inflammatory and auto-immune diseases in which neutrophils can affect the evolution of these diseases. To persist at inflammatory sites, neutrophils require inhibition of their rapid and constitutive apoptosis, an inhibitory effect that phlogogenic cytokines support. To date, the effects of IL-32γ on neutrophils remain unknown. We demonstrate that IL-32γ delays, in a dose-dependent manner, the spontaneous apoptosis of human blood neutrophils by activating mainly p38 MAPK through rapid p38 phosphorylation. PI3-K and ERK1/2 MAPK are also involved, but to a lesser extent. Most of cytokines that induce retardation of neutrophil apoptosis activate the expression of MCL-1 at both mRNA and protein levels. IL-32γ added to human blood neutrophils in vitro is associated with sustained levels of MCL-1 protein. This effect in neutrophils corresponds to a decrease of MCL-1 protein degradation without any effect on MCL-1 mRNA levels. The sustained levels of MCL-1 induced by IL-32γ are only abrogated by the p38β MAPK inhibitor SB202190. Additionally, IL-32γ induces a reduction in caspase 3 activity in neutrophils. In conclusion, IL-32γ affects human blood neutrophils in vitro by increasing their survival, suggesting that this cytokine could have profound effects on the deleterious functions of neutrophils in several diseases.
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Affiliation(s)
- Isabelle Allaeys
- Centre de Recherche en Rhumatologie et Immunologie (CRRI), Centre de Recherche du CHU de Québec, Département de Médecine, Université Laval, Québec, Canada
| | - Irina Gymninova
- Centre de Recherche en Rhumatologie et Immunologie (CRRI), Centre de Recherche du CHU de Québec, Département de Médecine, Université Laval, Québec, Canada
| | - Charlotte Canet-Jourdan
- Centre de Recherche en Rhumatologie et Immunologie (CRRI), Centre de Recherche du CHU de Québec, Département de Médecine, Université Laval, Québec, Canada
| | - Patrice E. Poubelle
- Centre de Recherche en Rhumatologie et Immunologie (CRRI), Centre de Recherche du CHU de Québec, Département de Médecine, Université Laval, Québec, Canada
- * E-mail:
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20
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Hossain MS, Ramachandiran S, Gewirtz AT, Waller EK. Recombinant TLR5 agonist CBLB502 promotes NK cell-mediated anti-CMV immunity in mice. PLoS One 2014; 9:e96165. [PMID: 24879439 PMCID: PMC4039429 DOI: 10.1371/journal.pone.0096165] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 04/04/2014] [Indexed: 12/02/2022] Open
Abstract
Prior work using allogeneic bone marrow transplantation (allo-BMT) models showed that peritransplant administration of flagellin, a toll-like receptor 5 (TLR5) agonist protected murine allo-BMT recipients from CMV infection while limiting graft-vs-host disease (GvHD). However, the mechanism by which flagellin-TLR5 interaction promotes anti-CMV immunity was not defined. Here, we investigated the anti-CMV immunity of NK cells in C57BL/6 (B6) mice treated with a highly purified cGMP grade recombinant flagellin variant CBLB502 (rflagellin) followed by murine CMV (mCMV) infection. A single dose of rflagellin administered to mice between 48 to 72 hours prior to MCMV infection resulted in optimal protection from mCMV lethality. Anti-mCMV immunity in rflagellin-treated mice correlated with a significantly reduced liver viral load and increased numbers of Ly49H+ and Ly49D+ activated cytotoxic NK cells. Additionally, the increased anti-mCMV immunity of NK cells was directly correlated with increased numbers of IFN-γ, granzyme B- and CD107a producing NK cells following mCMV infection. rFlagellin-induced anti-mCMV immunity was TLR5-dependent as rflagellin-treated TLR5 KO mice had ∼10-fold increased liver viral load compared with rflagellin-treated WT B6 mice. However, the increased anti-mCMV immunity of NK cells in rflagellin-treated mice is regulated indirectly as mouse NK cells do not express TLR5. Collectively, these data suggest that rflagellin treatment indirectly leads to activation of NK cells, which may be an important adjunct benefit of administering rflagellin in allo-BMT recipients.
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Affiliation(s)
- Mohammad S. Hossain
- Department of Hematology and Medical Oncology, Division of Stem Cell and Bone Marrow Transplantation, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia, United States of America
| | - Sampath Ramachandiran
- Department of Hematology and Medical Oncology, Division of Stem Cell and Bone Marrow Transplantation, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia, United States of America
| | - Andrew T. Gewirtz
- Department of Biology, Georgia State University, Atlanta, Georgia, United States of America
| | - Edmund K. Waller
- Department of Hematology and Medical Oncology, Division of Stem Cell and Bone Marrow Transplantation, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia, United States of America
- * E-mail:
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Hao J, Zhang C, Liang T, Song J, Hou G. rFliC prolongs allograft survival in association with the activation of recipient Tregs in a TLR5-dependent manner. Cell Mol Immunol 2014; 11:206-14. [PMID: 24097035 PMCID: PMC4003372 DOI: 10.1038/cmi.2013.44] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 08/02/2013] [Accepted: 08/08/2013] [Indexed: 12/21/2022] Open
Abstract
Allorejection remains an obstacle for successful organ transplantation. Although different types of immunosuppressive agents are effective for controlling rejection and prolonging graft survival, drug treatment is limited because of side effects and toxicity. Therefore, it is necessary and urgent to identify new candidate drugs for inducing allotolerance. Recently, it has been reported that bacterial flagellin induces the immunosuppressive activity of regulatory T cells (Tregs) in humans in vitro. In the present study, we analyzed the effects of recombinant flagellin (rFliC) on allograft survival and explored the underlying mechanisms associated with the activation of recipient Tregs in a murine skin allotransplantation model. The results showed that rFliC administration (3 mg/kg, once per day for 3 days, i.p.) prolonged allograft survival (mean survival time: 18.4±1.1 days) compared to the control group (10±0.7 days, P<0.01). Additionally, higher positive expression of Toll-like receptor 5 (TLR5) was detected within the allograft administered with rFliC. The frequency of CD4(+)CD25(+)Foxp3(+) Tregs; the expression of Treg-related factors TLR5, Foxp3, TGF-β1 and IL-10; and the proliferation and suppression of Tregs were increased following rFliC administration compared to the control. Moreover, the increased expression of tolerance-related molecules and the proliferation of Tregs induced by rFliC were attenuated by an anti-TLR5 blocking antibody both in vivo and in vitro. In conclusion, rFliC administration prolongs the survival of allografts, which is associated with the activation of recipient Tregs in a TLR5-dependent manner. rFliC may be a new candidate for anti-allorejection therapy.
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Chan PL, Zheng J, Liu Y, Lam KT, Xiang Z, Mao H, Liu Y, Qin G, Lau YL, Tu W. TLR5 signaling enhances the proliferation of human allogeneic CD40-activated B cell induced CD4hiCD25+ regulatory T cells. PLoS One 2013; 8:e67969. [PMID: 23844139 PMCID: PMC3700901 DOI: 10.1371/journal.pone.0067969] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Accepted: 05/23/2013] [Indexed: 01/07/2023] Open
Abstract
Although diverse functions of different toll-like receptors (TLR) on human natural regulatory T cells have been demonstrated recently, the role of TLR-related signals on human induced regulatory T cells remain elusive. Previously our group developed an ex vivo high-efficient system in generating human alloantigen-specific CD4hiCD25+ regulatory T cells from naïve CD4+CD25− T cells using allogeneic CD40-activated B cells as stimulators. In this study, we investigated the role of TLR5-related signals on the generation and function of these novel CD4hiCD25+ regulatory T cells. It was found that induced CD4hiCD25+ regulatory T cells expressed an up-regulated level of TLR5 compared to their precursors. The blockade of TLR5 using anti-TLR5 antibodies during the co-culture decreased CD4hiCD25+ regulatory T cells proliferation by induction of S phase arrest. The S phase arrest was associated with reduced ERK1/2 phosphorylation. However, TLR5 blockade did not decrease the CTLA-4, GITR and FOXP3 expressions, and the suppressive function of CD4hiCD25+ regulatory T cells. In conclusion, we discovered a novel function of TLR5-related signaling in enhancing the proliferation of CD4hiCD25+ regulatory T cells by promoting S phase progress but not involved in the suppressive function of human CD40-activated B cell-induced CD4hiCD25+ regulatory T cells, suggesting a novel role of TLR5-related signals in the generation of induced regulatory T cells.
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Affiliation(s)
- Ping-Lung Chan
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
| | - Jian Zheng
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
| | - Yinping Liu
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
| | - Kwok-Tai Lam
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
| | - Zheng Xiang
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
| | - Huawei Mao
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
| | - Yuan Liu
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
| | - Gang Qin
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
| | - Yu-Lung Lau
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
| | - Wenwei Tu
- Department of Paediatrics and Adolescent Medicine, Li Ka Shing Faculty of Medicine, University of Hong Kong. Hong Kong SAR, China
- * E-mail:
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23
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Thomas CJ, Schroder K. Pattern recognition receptor function in neutrophils. Trends Immunol 2013; 34:317-28. [DOI: 10.1016/j.it.2013.02.008] [Citation(s) in RCA: 129] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Revised: 02/26/2013] [Accepted: 02/28/2013] [Indexed: 12/13/2022]
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24
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Brucella abortus invasion of synoviocytes inhibits apoptosis and induces bone resorption through RANKL expression. Infect Immun 2013; 81:1940-51. [PMID: 23509146 DOI: 10.1128/iai.01366-12] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Arthritis is one of the most common complications of human active brucellosis, but its pathogenic mechanisms have not been completely elucidated. In this paper, we describe the role of synoviocytes in the pathogenesis of brucellar arthritis. Our results indicate that Brucella abortus infection inhibited synoviocyte apoptosis through the upregulation of antiapoptotic factors (cIAP-2, clusterin, livin, and P21/CIP/CDNK1A). In contrast, infection did not change the expression of proteins that have been involved in apoptosis induction such as Bad, Bax, cleaved procaspase 3, CytC, and TRAIL, among others; or their expression was reduced, as occurs in the case of P-p53(S15). In addition, B. abortus infection induced upregulation of adhesion molecules (CD54 and CD106), and the adhesion of monocytes and neutrophils to infected synoviocytes was significantly higher than to uninfected cells. Despite this increased adhesion, B. abortus-infected synoviocytes were able to inhibit apoptosis induced by supernatants from B. abortus-infected monocytes and neutrophils. Moreover, B. abortus infection increased soluble and membrane RANKL expression in synoviocytes that further induced monocytes to undergo osteoclastogenesis. The results presented here shed light on how the interactions of B. abortus with synovial fibroblasts may have an important role in the pathogenesis of brucellar arthritis.
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25
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Chamberlain ND, Vila OM, Volin MV, Volkov S, Pope RM, Swedler W, Mandelin AM, Shahrara S. TLR5, a novel and unidentified inflammatory mediator in rheumatoid arthritis that correlates with disease activity score and joint TNF-α levels. THE JOURNAL OF IMMUNOLOGY 2012; 189:475-83. [PMID: 22661088 DOI: 10.4049/jimmunol.1102977] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The innate immune system plays an important role in rheumatoid arthritis (RA) pathogenesis. Previous studies support the role of TLR2 and 4 in RA and experimental arthritis models; however, the regulation and pathogenic effect of TLR5 is undefined in RA. In this study, we show that TLR5 is elevated in RA and osteoarthritis ST lining and sublining macrophages and endothelial cells compared with normal individuals. Furthermore, expression of TLR5 is elevated in RA synovial fluid macrophages and RA peripheral blood monocytes compared with RA and normal peripheral blood in vitro-differentiated macrophages. We also found that TLR5 on RA monocytes is an important modulator of TNF-α in RA synovial fluid and that TLR5 expression on these cells strongly correlates with RA disease activity and TNF-α levels. Interestingly, TNF-α has a feedback regulation with TLR5 expression in RA monocytes, whereas expression of this receptor is regulated by IL-17 and IL-8 in RA macrophages and fibroblasts. We show that RA monocytes and macrophages are more responsive to TLR5 ligation compared with fibroblasts despite the proinflammatory response being mediated through the same signaling pathways in macrophages and fibroblasts. In conclusion, we document the potential role of TLR5 ligation in modulating transcription of TNF-α from RA synovial fluid and the strong correlation of TLR5 and TNF-α with each other and with disease activity score in RA monocytes. Our results suggest that expression of TLR5 may be a predictor for RA disease progression and that targeting TLR5 may suppress RA.
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Affiliation(s)
- Nathan D Chamberlain
- Division of Rheumatology, Department of Medicine, University of Illinois, Chicago, IL 60612, USA
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26
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Gillis A, Dupres V, Delestrait G, Mahillon J, Dufrêne YF. Nanoscale imaging of Bacillus thuringiensis flagella using atomic force microscopy. NANOSCALE 2012; 4:1585-1591. [PMID: 22159046 DOI: 10.1039/c1nr11161b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Because bacterial flagella play essential roles in various processes (motility, adhesion, host interactions, secretion), studying their expression in relation to function is an important challenge. Here, we use atomic force microscopy (AFM) to gain insight into the nanoscale surface properties of two wild-type and four mutant strains of Bacillus thuringiensis exhibiting various levels of flagellation. We show that, unlike AFM in liquid, AFM in air is a simple and reliable approach to observe the morphological details of the bacteria, and to quantify the density and dimensions of their flagella. We found that the amount of flagella expressed by the six strains, as observed at the nanoscale, correlates with their microscopic swarming motility. These observations provide novel information on flagella expression in gram-positive bacteria and demonstrate the power of AFM in genetic studies for the fast assessment of the phenotypic characteristics of bacterial strains altered in cell surface appendages.
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Affiliation(s)
- Annika Gillis
- Laboratory of Food and Environmental Microbiology, Earth and Life Institute, Université catholique de Louvain, Croix du Sud 2, Box L7.05.12, B-1348, Louvain-la-Neuve, Belgium
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27
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Hossain MS, Jaye DL, Pollack BP, Farris AB, Tselanyane ML, David E, Roback JD, Gewirtz AT, Waller EK. Flagellin, a TLR5 agonist, reduces graft-versus-host disease in allogeneic hematopoietic stem cell transplantation recipients while enhancing antiviral immunity. THE JOURNAL OF IMMUNOLOGY 2011; 187:5130-40. [PMID: 22013117 DOI: 10.4049/jimmunol.1101334] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Graft-versus-host disease (GVHD) is a major cause of morbidity and mortality in patients treated with allogeneic hematopoietic stem cell transplantation (HSCT). Posttransplant immunosuppressive drugs incompletely control GVHD and increase susceptibility to opportunistic infections. In this study, we used flagellin, a TLR5 agonist protein (∼50 kDa) extracted from bacterial flagella, as a novel experimental treatment strategy to reduce both acute and chronic GVHD in allogeneic HSCT recipients. On the basis of the radioprotective effects of flagellin, we hypothesized that flagellin could ameliorate GVHD in lethally irradiated murine models of allogeneic HSCT. Two doses of highly purified flagellin (administered 3 h before irradiation and 24 h after HSCT) reduced GVHD and led to better survival in both H-2(b) → CB6F1 and H-2(K) → B6 allogeneic HSCT models while preserving >99% donor T cell chimerism. Flagellin treatment preserved long-term posttransplant immune reconstitution characterized by more donor thymic-derived CD4(+)CD25(+)Foxp3(+) regulatory T cells and significantly enhanced antiviral immunity after murine CMV infection. The proliferation index and activation status of donor spleen-derived T cells and serum concentration of proinflammatory cytokines in flagellin-treated recipients were reduced significantly within 4 d posttransplant compared with those of the PBS-treated control recipients. Allogeneic transplantation of radiation chimeras previously engrafted with TLR5 knockout hematopoietic cells showed that interactions between flagellin and TLR5 expressed on both donor hematopoietic and host nonhematopoietic cells were required to reduce GVHD. Thus, the peritransplant administration of flagellin is a novel therapeutic approach to control GVHD while preserving posttransplant donor immunity.
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Affiliation(s)
- Mohammad S Hossain
- Division of Stem Cell and Bone Marrow Transplantation, Department of Hematology and Oncology, Winship Cancer Institute, Emory University, Atlanta, GA 30322, USA
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28
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Li J, Birkenheuer AJ, Marr HS, Levy MG, Yoder JA, Nordone SK. Expression and function of triggering receptor expressed on myeloid cells-1 (TREM-1) on canine neutrophils. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2011; 35:872-880. [PMID: 21549750 DOI: 10.1016/j.dci.2011.03.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Revised: 03/24/2011] [Accepted: 03/31/2011] [Indexed: 05/30/2023]
Abstract
The dog is both a valued veterinary species and a widely used translational model for sepsis research. However, relatively little work has been performed evaluating potential biomarkers present during canine infection. Triggering receptor expressed on myeloid cells-1 (TREM-1) has shown promise as a biomarker for infection and pneumonia in humans. Here we describe, for the first time, the expression and function of the canine orthologue of TREM-1. Expression of TREM-1 on canine neutrophils is significantly up-regulated by stimulation with microbial agonists of TLR2/6, TLR1/2, and TLR4/MD2. Kinetics of TREM-1 protein up-regulation are rapid, with significant increases observed within 2 hr of neutrophil activation. Functionally, canine TREM-1 synergistically enhances LPS-induced production of IL-8, TNF-α and a canine orthologue of CXCL1. Collectively, these data suggest that TREM-1 expression in dogs, as it is in humans, is an amplifier of pro-inflammatory responses to microbial products. These results have direct application to veterinary diagnostics as well as the potential to enhance the utility of canine disease models in the assessment of potential therapeutics in the treatment of human sepsis.
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Affiliation(s)
- Jingjing Li
- Comparative Biomedical Sciences Graduate Program, North Carolina State University, Raleigh, 27606, USA
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29
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Kwon S, Gewirtz AT, Hurley DJ, Robertson TP, Moore JN, Vandenplas ML. Disparities in TLR5 Expression and Responsiveness to Flagellin in Equine Neutrophils and Mononuclear Phagocytes. THE JOURNAL OF IMMUNOLOGY 2011; 186:6263-70. [DOI: 10.4049/jimmunol.1003824] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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30
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Mondal NK, Roy A, Mukherjee B, Das D, Ray MR. Indoor air pollution from biomass burning activates Akt in airway cells and peripheral blood lymphocytes: a study among premenopausal women in rural India. Toxicol Pathol 2010; 38:1085-98. [PMID: 20924080 DOI: 10.1177/0192623310385139] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Biomass burning is a major source of indoor air pollution in rural India. The authors investigated in this study whether cumulative exposures to biomass smoke cause activation of the serine/threonine kinase Akt in airway cells and peripheral blood lymphocytes (PBL). For this, the authors enrolled 87 premenopausal (median age 34 years), nonsmoking women who used to cook with biomass (wood, dung, crop wastes) and 85 age-matched control women who cooked with cleaner fuel liquefied petroleum gas. Immunocytochemical and immunoblotting assays revealed significantly higher levels of phosphorylated forms of Akt protein (p-Akt(ser473) and p-Akt(thr308)) in PBL, airway epithelial cells, alveolar macrophages, and neutrophils in sputum of biomass-using women than control. Akt activation in biomass users was associated with marked rise in generation of reactive oxygen species and concomitant depletion of superoxide dismutase. Measurement of particulate matter having a diameter of less than 10 and 2.5 µm in indoor air by real-time aerosol monitor showed 2 to 4 times more particulate pollution in biomass-using households, and Akt activation was positively associated with particulate pollution after controlling potential confounders. The findings suggest that chronic exposure to biomass smoke activates Akt, possibly via generation of oxidative stress.
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Affiliation(s)
- Nandan K Mondal
- Department of Experimental Hematology, Chittaranjan National Cancer Institute, Kolkata, India
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