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Vo DN, Yuan O, Kanaya M, Telliam-Dushime G, Li H, Kotova O, Caglar E, Honnens de Lichtenberg K, Rahman SH, Soneji S, Scheding S, Bryder D, Malmberg KJ, Sitnicka E. A temporal developmental map separates human NK cells from noncytotoxic ILCs through clonal and single-cell analysis. Blood Adv 2024; 8:2933-2951. [PMID: 38484189 PMCID: PMC11176970 DOI: 10.1182/bloodadvances.2023011909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 03/05/2024] [Indexed: 06/04/2024] Open
Abstract
ABSTRACT Natural killer (NK) cells represent the cytotoxic member within the innate lymphoid cell (ILC) family that are important against viral infections and cancer. Although the NK cell emergence from hematopoietic stem and progenitor cells through multiple intermediate stages and the underlying regulatory gene network has been extensively studied in mice, this process is not well characterized in humans. Here, using a temporal in vitro model to reconstruct the developmental trajectory of NK lineage, we identified an ILC-restricted oligopotent stage 3a CD34-CD117+CD161+CD45RA+CD56- progenitor population, that exclusively gave rise to CD56-expressing ILCs in vitro. We also further investigated a previously nonappreciated heterogeneity within the CD56+CD94-NKp44+ subset, phenotypically equivalent to stage 3b population containing both group-1 ILC and RORγt+ ILC3 cells, that could be further separated based on their differential expression of DNAM-1 and CD161 receptors. We confirmed that DNAM-1hi S3b and CD161hiCD117hi ILC3 populations distinctively differed in their expression of effector molecules, cytokine secretion, and cytotoxic activity. Furthermore, analysis of lineage output using DNA-barcode tracing across these stages supported a close developmental relationship between S3b-NK and S4-NK (CD56+CD94+) cells, whereas distant to the ILC3 subset. Cross-referencing gene signatures of culture-derived NK cells and other noncytotoxic ILCs with publicly available data sets validated that these in vitro stages highly resemble transcriptional profiles of respective in vivo ILC counterparts. Finally, by integrating RNA velocity and gene network analysis through single-cell regulatory network inference and clustering we unravel a network of coordinated and highly dynamic regulons driving the cytotoxic NK cell program, as a guide map for future studies on NK cell regulation.
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Affiliation(s)
- Dang Nghiem Vo
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Ouyang Yuan
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Minoru Kanaya
- Department of Cancer Immunology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway
| | - Gladys Telliam-Dushime
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Hongzhe Li
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Olga Kotova
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Emel Caglar
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
- Cell Therapy Research, Novo Nordisk A/S, Måløv, Copenhagen, Denmark
| | | | | | - Shamit Soneji
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Stefan Scheding
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
- Department of Hematology, Skåne University Hospital, Lund, Sweden
| | - David Bryder
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
| | - Karl-Johan Malmberg
- Department of Cancer Immunology, Institute for Cancer Research, Oslo University Hospital, Oslo, Norway
- Precision Immunotherapy Alliance, University of Oslo, Oslo, Norway
- Department of Medicine Huddinge, Center for Infectious Medicine, Karolinska Institute, Stockholm, Sweden
| | - Ewa Sitnicka
- Lund Stem Cell Center, Lund University, Lund, Sweden
- Division of Molecular Hematology, Department of Laboratory Medicine, Lund University, Lund, Sweden
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Liu M, Zhou J, Yin R, Yin H, Ding Y, Ma F, Qian L. The HMGB1 (C106A) mutation inhibits IL-10-producing CD19hiFcγRIIbhi B cell expansion by suppressing STAT3 activation in mice. Front Immunol 2022; 13:975551. [PMID: 35983056 PMCID: PMC9378787 DOI: 10.3389/fimmu.2022.975551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 07/11/2022] [Indexed: 12/05/2022] Open
Abstract
Regulatory B cells have important roles in inflammation and autoimmune diseases. A newly discovered subpopulation of B cells with a CD19hiFcγRIIbhi phenotype inhibits the proliferation of CD4+ T cells by secreting interleukin (IL)-10. The expansion of CD19hiFcγRIIbhi B cells in mouse spleen can be induced by lipopolysaccharide (LPS) or CpG oligodeoxynucleotide stimulation. However, the mechanism of CD19hiFcγRIIbhi B cell expansion and its role in inflammatory diseases are unclear. Here, we report that, under inflammatory conditions, the proliferation and immunosuppressive function of CD19hiFcγRIIbhi B cells were decreased in high mobility group box1 (HMGB1) C106A mutant mice, compared with wild-type mice. The HMGB1 (C106A) mutation in B cells reduced STAT3 phosphorylation, restricting the expansion and suppressive function of CD19hiFcγRIIbhi B cells. Compared with CD19hiFcγRIIbhi B cells from wild-type mice, CD19hiFcγRIIbhi B cells from Hmgb1(C106A) mice significantly reduced the survival of mice with sepsis. Recombinant HMGB1 promoted the expansion of IL-10-producing CD19hiFcγRIIbhi B cells among LPS-activated B cells in vitro. Furthermore, the percentage of CD19hiFcγRIIbhi regulatory B cells in the peripheral blood was increased in patients with sepsis, compared with healthy controls. These findings implicate the role of HMGB1 in the expansion and immunosuppressive function of CD19hiFcγRIIbhi B cells.
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Affiliation(s)
- Mengru Liu
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, China
| | - Jingwen Zhou
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, China
| | - Rui Yin
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, China
| | - Hui Yin
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, China
| | - Yue Ding
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, China
| | - Feng Ma
- CAMS Key Laboratory of Synthetic Biology Regulatory Elements, Institute of Systems Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Suzhou Institute of Systems Medicine, Suzhou, China
- *Correspondence: Li Qian, ; Feng Ma,
| | - Li Qian
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou, China
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Yangzhou, China
- *Correspondence: Li Qian, ; Feng Ma,
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Al-Dujaili AH, Mousa RF, Al-Hakeim HK, Maes M. High Mobility Group Protein 1 and Dickkopf-Related Protein 1 in Schizophrenia and Treatment-Resistant Schizophrenia: Associations With Interleukin-6, Symptom Domains, and Neurocognitive Impairments. Schizophr Bull 2020; 47:530-541. [PMID: 32971537 PMCID: PMC7965081 DOI: 10.1093/schbul/sbaa136] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND Schizophrenia (SCZ) and treatment-resistant schizophrenia (TRS) are associated with aberrations in immune-inflammatory pathways. Increased high mobility group protein 1 (HMGB1), an inflammatory mediator, and Dickkopf-related protein (DKK1), a Wnt/β-catenin signaling antagonist, affect the blood-brain barrier and induce neurotoxic effects and neurocognitive deficits. AIM The present study aims to examine HMGB1 and DDK1 in nonresponders to treatments (NRTT) with antipsychotics (n = 60), partial RTT (PRTT, n = 55), and healthy controls (n = 43) in relation to established markers of SCZ, including interleukin (IL)-6, IL-10, and CCL11 (eotaxin), and to delineate whether these proteins are associated with the SCZ symptom subdomains and neurocognitive impairments. RESULTS HMGB1, DKK1, IL-6, and CCL11 were significantly higher in SCZ patients than in controls. DKK1 and IL-6 were significantly higher in NRTT than in PRTT and controls, while IL-10 was higher in NRTT than in controls. Binary logistic regression analysis showed that SCZ was best predicted by increased DDK1 and HMGB1, while NRTT (vs PRTT) was best predicted by increased IL-6 and CCL11 levels. A large part of the variance in psychosis, hostility, excitation, mannerism, and negative (PHEMN) symptoms and formal thought disorders was explained by HMGB1, IL-6, and CCL11, while most neurocognitive functions were predicted by HMGB1, DDK1, and CCL11. CONCLUSIONS The neurotoxic effects of HMGB1, DKK1, IL-6, and CCL11 including the effects on the blood-brain barrier and the Wnt/β-catenin signaling pathway may cause impairments in executive functions and working, episodic, and semantic memory and explain, in part, PHEMN symptoms and a nonresponse to treatment with antipsychotic drugs.
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Affiliation(s)
| | - Rana Fadhil Mousa
- Faculty of Veterinary Medicine, University of Kerbala, Kerbala, Iraq
| | | | - Michael Maes
- Department of Psychiatry, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
- Department of Psychiatry, Medical University of Plovdiv, Plovdiv, Bulgaria
- IMPACT Strategic Research Centre, School of Medicine, Deakin University, Geelong, VIC, Australia
- To whom correspondence should be addressed; IMPACT Strategic Research Center, Barwon Health, School of Medicine, Deakin University, PO Box 281, Geelong, VIC3220, Australia; tel: 0066-930466001, e-mail:
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Recurrent Stimulation of Natural Killer Cell Clones with K562 Expressing Membrane-Bound Interleukin-21 Affects Their Phenotype, Interferon-γ Production, and Lifespan. Int J Mol Sci 2019; 20:ijms20020443. [PMID: 30669565 PMCID: PMC6359338 DOI: 10.3390/ijms20020443] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 12/27/2018] [Accepted: 01/16/2019] [Indexed: 11/16/2022] Open
Abstract
A pattern of natural killer cell (NK cell) heterogeneity determines proliferative and functional responses to activating stimuli in individuals. Obtaining the progeny of a single cell by cloning the original population is one of the ways to study NK cell heterogeneity. In this work, we sorted single cells into a plate and stimulated them via interleukin (IL)-2 and gene-modified K562 feeder cells that expressed membrane-bound IL-21 (K562-mbIL21), which led to a generation of phenotypically confirmed and functionally active NK cell clones. Next, we applied two models of clone cultivation, which differently affected their phenotype, lifespan, and functional activity. The first model, which included weekly restimulation of clones with K562-mbIL21 and IL-2, resulted in the generation of relatively short-lived (5⁻7 weeks) clones of highly activated NK cells. Levels of human leukocyte antigen class II molecule-DR isotype (HLA-DR) expression in the expanded NK cells correlated strongly with interferon-γ (IFN-γ) production. The second model, in which NK cells were restimulated weekly with IL-2 alone and once on the sixth week with K562-mbIL21 and IL-2, produced long-lived clones (8⁻14 weeks) that expanded up to 10⁷ cells with a lower ability to produce IFN-γ. Our method is applicable for studying variability in phenotype, proliferative, and functional activity of certain NK cell progeny in response to the stimulation, which may help in selecting NK cells best suited for clinical use.
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Zingoni A, Fionda C, Borrelli C, Cippitelli M, Santoni A, Soriani A. Natural Killer Cell Response to Chemotherapy-Stressed Cancer Cells: Role in Tumor Immunosurveillance. Front Immunol 2017; 8:1194. [PMID: 28993779 PMCID: PMC5622151 DOI: 10.3389/fimmu.2017.01194] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 09/08/2017] [Indexed: 12/13/2022] Open
Abstract
Natural killer (NK) cells are innate cytotoxic lymphoid cells that actively prevent neoplastic development, growth, and metastatic dissemination in a process called cancer immunosurveillance. An equilibrium between immune control and tumor growth is maintained as long as cancer cells evade immunosurveillance. Therapies designed to kill cancer cells and to simultaneously sustain host antitumor immunity are an appealing strategy to control tumor growth. Several chemotherapeutic agents, depending on which drugs and doses are used, give rise to DNA damage and cancer cell death by means of apoptosis, immunogenic cell death, or other forms of non-apoptotic death (i.e., mitotic catastrophe, senescence, and autophagy). However, it is becoming increasingly clear that they can trigger additional stress responses. Indeed, relevant immunostimulating effects of different therapeutic programs include also the activation of pathways able to promote their recognition by immune effector cells. Among stress-inducible immunostimulating proteins, changes in the expression levels of NK cell-activating and inhibitory ligands, as well as of death receptors on tumor cells, play a critical role in their detection and elimination by innate immune effectors, including NK cells. Here, we will review recent advances in chemotherapy-mediated cellular stress pathways able to stimulate NK cell effector functions. In particular, we will address how these cytotoxic lymphocytes sense and respond to different types of drug-induced stresses contributing to anticancer activity.
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Affiliation(s)
- Alessandra Zingoni
- Department of Molecular Medicine, Sapienza University of Rome, Laboratory Affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, Rome, Italy
| | - Cinzia Fionda
- Department of Molecular Medicine, Sapienza University of Rome, Laboratory Affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, Rome, Italy
| | - Cristiana Borrelli
- Department of Molecular Medicine, Sapienza University of Rome, Laboratory Affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, Rome, Italy.,Center for Life Nano Science@Sapienza, Istituto Italiano di Tecnologia, Rome, Italy
| | - Marco Cippitelli
- Department of Molecular Medicine, Sapienza University of Rome, Laboratory Affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, Rome, Italy
| | - Angela Santoni
- Department of Molecular Medicine, Sapienza University of Rome, Laboratory Affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, Rome, Italy.,Neuromed I.R.C.C.S. - Istituto Neurologico Mediterraneo, Pozzilli, Italy
| | - Alessandra Soriani
- Department of Molecular Medicine, Sapienza University of Rome, Laboratory Affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, Rome, Italy
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6
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Wang C, de Souza AW, Westra J, Bijl M, Chen M, Zhao MH, Kallenberg CG. Emerging role of high mobility group box 1 in ANCA-associated vasculitis. Autoimmun Rev 2015. [DOI: 10.1016/j.autrev.2015.07.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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7
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Parodi M, Pedrazzi M, Cantoni C, Averna M, Patrone M, Cavaletto M, Spertino S, Pende D, Balsamo M, Pietra G, Sivori S, Carlomagno S, Mingari MC, Moretta L, Sparatore B, Vitale M. Natural Killer (NK)/melanoma cell interaction induces NK-mediated release of chemotactic High Mobility Group Box-1 (HMGB1) capable of amplifying NK cell recruitment. Oncoimmunology 2015; 4:e1052353. [PMID: 26587323 DOI: 10.1080/2162402x.2015.1052353] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 05/12/2015] [Accepted: 05/13/2015] [Indexed: 02/06/2023] Open
Abstract
In this study we characterize a new mechanism by which Natural Killer (NK) cells may amplify their recruitment to tumors. We show that NK cells, upon interaction with melanoma cells, can release a chemotactic form of High Mobility Group Box-1 (HMGB1) protein capable of attracting additional activated NK cells. We first demonstrate that the engagement of different activating NK cell receptors, including those mainly involved in tumor cell recognition can induce the active release of HMGB1. Then we show that during NK-mediated tumor cell killing two HMGB1 forms are released, each displaying a specific electrophoretic mobility possibly corresponding to a different redox status. By the comparison of normal and perforin-defective NK cells (which are unable to kill target cells) we demonstrate that, in NK/melanoma cell co-cultures, NK cells specifically release an HMGB1 form that acts as chemoattractant, while dying tumor cells passively release a non-chemotactic HMGB1. Finally, we show that Receptor for Advanced Glycation End products is expressed by NK cells and mediates HMGB1-induced NK cell chemotaxis. Proteomic analysis of NK cells exposed to recombinant HMGB1 revealed that this molecule, besides inducing immediate chemotaxis, also promotes changes in the expression of proteins involved in the regulation of the cytoskeletal network. Importantly, these modifications could be associated with an increased motility of NK cells. Thus, our findings allow the definition of a previously unidentified mechanism used by NK cells to amplify their response to tumors, and provide additional clues for the emerging role of HMGB1 in immunomodulation and tumor immunity.
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Affiliation(s)
- Monica Parodi
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy
| | - Marco Pedrazzi
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy
| | - Claudia Cantoni
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy ; Center of Excellence for Biomedical Research (CEBR); University of Genova ; Genova, Italy ; Istituto Giannina Gaslini ; Genova, Italy
| | - Monica Averna
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy ; Center of Excellence for Biomedical Research (CEBR); University of Genova ; Genova, Italy
| | - Mauro Patrone
- Department of Sciences and Technological Innovation (DiSIT); University of Piemonte Orientale ; Alessandria, Italy
| | - Maria Cavaletto
- Department of Sciences and Technological Innovation (DiSIT); University of Piemonte Orientale ; Alessandria, Italy
| | - Stefano Spertino
- Department of Sciences and Technological Innovation (DiSIT); University of Piemonte Orientale ; Alessandria, Italy
| | | | - Mirna Balsamo
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy
| | - Gabriella Pietra
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy ; IRCCS AOU San Martino-IST ; Genova, Italy
| | - Simona Sivori
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy ; Center of Excellence for Biomedical Research (CEBR); University of Genova ; Genova, Italy
| | - Simona Carlomagno
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy
| | - Maria Cristina Mingari
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy ; Center of Excellence for Biomedical Research (CEBR); University of Genova ; Genova, Italy ; IRCCS AOU San Martino-IST ; Genova, Italy
| | | | - Bianca Sparatore
- Department of Experimental Medicine (DIMES); University of Genova ; Genova, Italy ; Center of Excellence for Biomedical Research (CEBR); University of Genova ; Genova, Italy
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Palmblad K, Schierbeck H, Sundberg E, Horne AC, Harris HE, Henter JI, Antoine DJ, Andersson U. High systemic levels of the cytokine-inducing HMGB1 isoform secreted in severe macrophage activation syndrome. Mol Med 2015; 20:538-47. [PMID: 25247290 DOI: 10.2119/molmed.2014.00183] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 09/15/2014] [Indexed: 01/31/2023] Open
Abstract
Macrophage activation syndrome (MAS) is a potentially fatal complication of systemic inflammation. High mobility group box 1 (HMGB1) is a nuclear protein extensively leaked extracellularly during necrotic cell death or actively secreted by natural killer (NK) cells, macrophages and additional cells during infection or sterile injury. Extracellular HMGB1 orchestrates key events in inflammation as a prototypic alarmin. The redox states of its three cysteines render the molecule mutually exclusive functions: fully reduced "all-thiol HMGB1" exerts chemotactic activity; "disulfide HMGB1" has cytokine-inducing, toll-like receptor 4 (TLR4)-mediated effects—while terminally oxidized "sulfonyl HMGB1" lacks inflammatory activity. This study examines the kinetic pattern of systemic HMGB1 isoform expression during therapy in four children with severe MAS. Three of the four patients with underlying systemic rheumatic diseases were treated with biologics and two suffered from triggering herpes virus infections at the onset of MAS. All patients required intensive care unit therapy due to life-threatening illness. Tandem mass-spectrometric analysis revealed dramatically increased systemic levels of the cytokine-inducing HMGB1 isoform during early MAS. Disease control coincided with supplementary etoposide therapy initiated to boost apoptotic cell death, when systemic HMGB1 levels drastically declined and the molecule emerged mainly in its oxidized, noninflammatory isoform. Systemic interferon (IFN)-γ and ferritin peaked concomitantly with HMGB1, whereas interleukin (IL)-18 and monocyte chemotactic protein (MCP)-1 levels developed differently. In conclusion, this work provides new insights in HMGB1 biology, suggesting that the molecule is not merely a biomarker of inflammation, but most likely also contributes to the pathogenesis of MAS. These observations encourage further studies of disulfide HMGB1 antagonists to improve outcome of MAS.
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Affiliation(s)
- Karin Palmblad
- Unit of Pediatric Rheumatology, Department of Women's and Children's Health, Karolinska Institutet, Karolinska University Hospital, Solna, Karolinska Institutet, Stockholm, Sweden
| | - Hanna Schierbeck
- Unit of Pediatric Rheumatology, Department of Women's and Children's Health, Karolinska Institutet, Karolinska University Hospital, Solna, Karolinska Institutet, Stockholm, Sweden
| | - Erik Sundberg
- Unit of Pediatric Rheumatology, Department of Women's and Children's Health, Karolinska Institutet, Karolinska University Hospital, Solna, Karolinska Institutet, Stockholm, Sweden
| | - Anna-Carin Horne
- Unit of Pediatric Rheumatology, Department of Women's and Children's Health, Karolinska Institutet, Karolinska University Hospital, Solna, Karolinska Institutet, Stockholm, Sweden
| | - Helena Erlandsson Harris
- Rheumatology Unit, Department of Medicine, Karolinska Institutet, Karolinska University Hospital, Solna, Karolinska Institutet, Stockholm, Sweden
| | - Jan-Inge Henter
- Childhood Cancer Research Unit, Department of Women's and Children's Health, Karolinska Institutet, Karolinska University Hospital, Solna, Karolinska Institutet, Stockholm, Sweden
| | - Daniel J Antoine
- Medical Research Council Centre for Drug Safety Science, Department of Molecular and Clinical Pharmacology, University of Liverpool, United Kingdom
| | - Ulf Andersson
- Unit of Pediatric Rheumatology, Department of Women's and Children's Health, Karolinska Institutet, Karolinska University Hospital, Solna, Karolinska Institutet, Stockholm, Sweden
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9
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Kang R, Chen R, Zhang Q, Hou W, Wu S, Cao L, Huang J, Yu Y, Fan XG, Yan Z, Sun X, Wang H, Wang Q, Tsung A, Billiar TR, Zeh HJ, Lotze MT, Tang D. HMGB1 in health and disease. Mol Aspects Med 2014; 40:1-116. [PMID: 25010388 PMCID: PMC4254084 DOI: 10.1016/j.mam.2014.05.001] [Citation(s) in RCA: 681] [Impact Index Per Article: 68.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 05/05/2014] [Indexed: 12/22/2022]
Abstract
Complex genetic and physiological variations as well as environmental factors that drive emergence of chromosomal instability, development of unscheduled cell death, skewed differentiation, and altered metabolism are central to the pathogenesis of human diseases and disorders. Understanding the molecular bases for these processes is important for the development of new diagnostic biomarkers, and for identifying new therapeutic targets. In 1973, a group of non-histone nuclear proteins with high electrophoretic mobility was discovered and termed high-mobility group (HMG) proteins. The HMG proteins include three superfamilies termed HMGB, HMGN, and HMGA. High-mobility group box 1 (HMGB1), the most abundant and well-studied HMG protein, senses and coordinates the cellular stress response and plays a critical role not only inside of the cell as a DNA chaperone, chromosome guardian, autophagy sustainer, and protector from apoptotic cell death, but also outside the cell as the prototypic damage associated molecular pattern molecule (DAMP). This DAMP, in conjunction with other factors, thus has cytokine, chemokine, and growth factor activity, orchestrating the inflammatory and immune response. All of these characteristics make HMGB1 a critical molecular target in multiple human diseases including infectious diseases, ischemia, immune disorders, neurodegenerative diseases, metabolic disorders, and cancer. Indeed, a number of emergent strategies have been used to inhibit HMGB1 expression, release, and activity in vitro and in vivo. These include antibodies, peptide inhibitors, RNAi, anti-coagulants, endogenous hormones, various chemical compounds, HMGB1-receptor and signaling pathway inhibition, artificial DNAs, physical strategies including vagus nerve stimulation and other surgical approaches. Future work further investigating the details of HMGB1 localization, structure, post-translational modification, and identification of additional partners will undoubtedly uncover additional secrets regarding HMGB1's multiple functions.
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Affiliation(s)
- Rui Kang
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA.
| | - Ruochan Chen
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | - Qiuhong Zhang
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | - Wen Hou
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | - Sha Wu
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | - Lizhi Cao
- Department of Pediatrics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Jin Huang
- Department of Oncology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Yan Yu
- Department of Pediatrics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Xue-Gong Fan
- Department of Infectious Diseases, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Zhengwen Yan
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA; Department of Neurology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong 510120, China
| | - Xiaofang Sun
- Key Laboratory for Major Obstetric Diseases of Guangdong Province, Key Laboratory of Reproduction and Genetics of Guangdong Higher Education Institutes, Experimental Department of Institute of Gynecology and Obstetrics, The Third Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong 510510, China
| | - Haichao Wang
- Laboratory of Emergency Medicine, The Feinstein Institute for Medical Research, Manhasset, NY 11030, USA
| | - Qingde Wang
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | - Allan Tsung
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | - Timothy R Billiar
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | - Herbert J Zeh
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | - Michael T Lotze
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA
| | - Daolin Tang
- Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA.
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10
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De Toma I, Rossetti G, Zambrano S, Bianchi ME, Agresti A. Nucleosome loss facilitates the chemotactic response of macrophages. J Intern Med 2014; 276:454-69. [PMID: 25069756 DOI: 10.1111/joim.12286] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND High mobility group box 1 (HMGB1) is a small nuclear protein with two functions. In the nucleus, it helps to wrap DNA around nucleosomes. When secreted, it recruits inflammatory cells and induces cytokine production. Before HMGB1 is secreted from inflammatory cells, it relocates to the cytoplasm, which partially or totally depletes cell nuclei of HMGB1. We previously showed that cells lacking HMGB1 contain 20% fewer nucleosomes and 30% more RNA transcripts levels genome-wide. OBJECTIVE We hypothesized that the depletion of nuclear HMGB1 plays a role in inflammation that can enhance or complement the role of extracellular HMGB1. METHODS We analysed the transcriptional profile of wild-type and Hmgb1-/- mouse embryonic fibroblasts (MEFs) as a proxy for cells that have lost HMGB1 from their nuclei. We explored the transcriptome of wild-type and Hmgb1-/- macrophages differentiated in the presence of granulocyte-macrophage colony-stimulating factor, before and after exposure to LPS/IFN-γ. In the same cells, histones and nuclear HMGB1 were quantified. RESULTS We found that Hmgb1-/- MEFs show a transcriptional profile associated with stress and inflammation responses. Moreover, wild-type macrophages that have secreted HMGB1 because of LPS/IFN-γ exposure rapidly reduce their histone content as much as cells that genetically lack HMGB1. Importantly, unstimulated Hmgb1-/- macrophages activate transcriptional pathways associated with cell migration and chemotaxis. CONCLUSIONS We suggest that nucleosome loss is an early event that facilitates transcriptional responses of macrophages to inflammation, particularly chemotaxis. HMGB1's dual roles in the nucleus and in the extracellular space appear to be complementary.
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Affiliation(s)
- I De Toma
- Università Vita-Salute San Raffaele, Milan, Italy
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11
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Huang LF, Yao YM, Sheng ZY. Novel insights for high mobility group box 1 protein-mediated cellular immune response in sepsis: A systemic review. World J Emerg Med 2014; 3:165-71. [PMID: 25215057 DOI: 10.5847/wjem.j.issn.1920-8642.2012.03.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Accepted: 07/13/2012] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND High mobility group box 1 protein (HMGB1) is a highly conserved, ubiquitous protein in the nuclei and cytoplasm of nearly all cell types. HMGB1 is secreted into the extracellular milieu and acts as a proinfl ammatory cytokine. In this article we reviewed briefl y the cellular immune response mediated by HMGB1 in infl ammation and sepsis. METHODS This systemic review is mainly based on our own work and other related reports. RESULTS HMGB1 can actively affect the immune functions of many types of cells including T lymphocytes, regulatory T cells (Tregs), dendritic cells (DCs), macrophages, and natural killer cells (NK cells). Various cellular responses can be mediated by HMGB1 which binds to cell-surface receptors [e.g., the receptor for advanced glycation end products (RAGE), Toll-like receptor (TLR)2, and TLR4]. Anti-HMGB1 treatment, such as anti-HMGB1 polyclonal or monoclonal antibodies, inhibitors (e.g., ethyl pyruvate) and antagonists (e.g., A box), can protect against sepsis lethality and give a wider window for the treatment opportunity. CONCLUSION HMGB1 is an attractive target for the development of new therapeutic strategies in the treatment of patients with septic complications.
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Affiliation(s)
- Li-Feng Huang
- Department of Microbiology and Immunology, Burns Institute, First Hospital Affiliated to the Chinese People's Liberation Army General Hospital, Beijing 100048, China
| | - Yong-Ming Yao
- Department of Microbiology and Immunology, Burns Institute, First Hospital Affiliated to the Chinese People's Liberation Army General Hospital, Beijing 100048, China
| | - Zhi-Yong Sheng
- Department of Microbiology and Immunology, Burns Institute, First Hospital Affiliated to the Chinese People's Liberation Army General Hospital, Beijing 100048, China
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12
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Deauvieau F, Ollion V, Doffin AC, Achard C, Fonteneau JF, Verronese E, Durand I, Ghittoni R, Marvel J, Dezutter-Dambuyant C, Walzer T, Vie H, Perrot I, Goutagny N, Caux C, Valladeau-Guilemond J. Human natural killer cells promote cross-presentation of tumor cell-derived antigens by dendritic cells. Int J Cancer 2014; 136:1085-94. [PMID: 25046660 DOI: 10.1002/ijc.29087] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 06/18/2014] [Indexed: 12/24/2022]
Abstract
Dendritic cells (DCs) cross-present antigen (Ag) to initiate T-cell immunity against most infections and tumors. Natural killer (NK) cells are innate cytolytic lymphocytes that have emerged as key modulators of multiple DC functions. Here, we show that human NK cells promote cross-presentation of tumor cell-derived Ag by DC leading to Ag-specific CD8(+) T-cell activation. Surprisingly, cytotoxic function of NK cells was not required. Instead, we highlight a critical and nonredundant role for IFN-γ and TNF-α production by NK cells to enhance cross-presentation by DC using two different Ag models. Importantly, we observed that NK cells promote cell-associated Ag cross-presentation selectively by monocytes-derived DC (Mo-DC) and CD34-derived CD11b(neg) CD141(high) DC subsets but not by myeloid CD11b(+) DC. Moreover, we demonstrate that triggering NK cell activation by monoclonal antibodies (mAbs)-coated tumor cells leads to efficient DC cross-presentation, supporting the concept that NK cells can contribute to therapeutic mAbs efficiency by inducing downstream adaptive immunity. Taken together, our findings point toward a novel role of human NK cells bridging innate and adaptive immunity through selective induction of cell-associated Ag cross-presentation by CD141(high) DC, a process that could be exploited to better harness Ag-specific cellular immunity in immunotherapy.
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Affiliation(s)
- Florence Deauvieau
- Inserm UMR-S1052, Centre de Recherche en Cancérologie de Lyon, Lyon, France; CNRS UMR5286, Centre de Recherche en Cancérologie de Lyon, Lyon, France; UNIV UMR1052, Centre de Recherche en Cancérologie de Lyon, Lyon, France; Université de Lyon, Lyon, France; Centre Léon Bérard, Lyon, France
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13
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Awad A, Yassine H, Barrier M, Vorng H, Marquillies P, Tsicopoulos A, Duez C. Natural killer cells induce eosinophil activation and apoptosis. PLoS One 2014; 9:e94492. [PMID: 24727794 PMCID: PMC3984162 DOI: 10.1371/journal.pone.0094492] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 03/17/2014] [Indexed: 12/18/2022] Open
Abstract
Eosinophils are potent inflammatory cells with numerous immune functions, including antigen presentation and exacerbation of inflammatory responses through their capacity to release a range of largely preformed cytokines and lipid mediators. Thus, timely regulation of eosinophil activation and apoptosis is crucial to develop beneficial immune response and to avoid tissue damage and induce resolution of inflammation. Natural Killer (NK) cells have been reported to influence innate and adaptive immune responses by multiple mechanisms including cytotoxicity against other immune cells. In this study, we analyzed the effect of the interaction between NK cells and eosinophils. Co-culture experiments revealed that human NK cells could trigger autologous eosinophil activation, as shown by up-regulation of CD69 and down-regulation of CD62L, as well as degranulation, evidenced by increased CD63 surface expression, secretion of eosinophil cationic protein (ECP) and eosinophil derived neurotoxin (EDN). Moreover, NK cells significantly and dose dependently increased eosinophil apoptosis as shown by annexin V and propidium iodide (PI) staining. Direct contact was necessary for eosinophil degranulation and apoptosis. Increased expression of phosphorylated extracellular signal-regulated kinase (ERK) in cocultured eosinophils and inhibition of eosinophil CD63 expression by pharmacologic inhibitors suggest that MAPK and PI3K pathways are involved in NK cell-induced eosinophil degranulation. Finally, we showed that NK cells increased reactive oxygen species (ROS) expression by eosinophils in co-culture and that mitochondrial inhibitors (rotenone and antimycin) partially diminished NK cell-induced eosinophil apoptosis, suggesting the implication of mitochondrial ROS in NK cell-induced eosinophil apoptosis. Pan-caspase inhibitor (ZVAD-FMK) only slightly decreased eosinophil apoptosis in coculture. Altogether, our results suggest that NK cells regulate eosinophil functions by inducing their activation and their apoptosis.
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Affiliation(s)
- Ali Awad
- Pulmonary Immunity, Institut National de la Santé Et de la Recherche Médicale, Lille, France
- Institut Pasteur de Lille, Center for Infection and Immunity of Lille, Lille, France
- CNRS UMR 8204, Lille, France
- Univ Lille Nord de France, Lille, France
| | - Hanane Yassine
- Pulmonary Immunity, Institut National de la Santé Et de la Recherche Médicale, Lille, France
- Institut Pasteur de Lille, Center for Infection and Immunity of Lille, Lille, France
- CNRS UMR 8204, Lille, France
- Univ Lille Nord de France, Lille, France
| | - Mathieu Barrier
- Pulmonary Immunity, Institut National de la Santé Et de la Recherche Médicale, Lille, France
- Institut Pasteur de Lille, Center for Infection and Immunity of Lille, Lille, France
- CNRS UMR 8204, Lille, France
- Univ Lille Nord de France, Lille, France
| | - Han Vorng
- Pulmonary Immunity, Institut National de la Santé Et de la Recherche Médicale, Lille, France
- Institut Pasteur de Lille, Center for Infection and Immunity of Lille, Lille, France
- CNRS UMR 8204, Lille, France
- Univ Lille Nord de France, Lille, France
| | - Philippe Marquillies
- Pulmonary Immunity, Institut National de la Santé Et de la Recherche Médicale, Lille, France
- Institut Pasteur de Lille, Center for Infection and Immunity of Lille, Lille, France
- CNRS UMR 8204, Lille, France
- Univ Lille Nord de France, Lille, France
| | - Anne Tsicopoulos
- Pulmonary Immunity, Institut National de la Santé Et de la Recherche Médicale, Lille, France
- Institut Pasteur de Lille, Center for Infection and Immunity of Lille, Lille, France
- CNRS UMR 8204, Lille, France
- Univ Lille Nord de France, Lille, France
- Clinique des Maladies Respiratoires et Centre Hospitalier Régional et Universitaire de Lille, Lille, France
| | - Catherine Duez
- Pulmonary Immunity, Institut National de la Santé Et de la Recherche Médicale, Lille, France
- Institut Pasteur de Lille, Center for Infection and Immunity of Lille, Lille, France
- CNRS UMR 8204, Lille, France
- Univ Lille Nord de France, Lille, France
- * E-mail:
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14
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Seeger P, Bosisio D, Parolini S, Badolato R, Gismondi A, Santoni A, Sozzani S. Activin A as a mediator of NK-dendritic cell functional interactions. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2014; 192:1241-8. [PMID: 24395917 DOI: 10.4049/jimmunol.1301487] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The interaction of NK cells with dendritic cells (DCs) results in reciprocal cell activation through the interaction of membrane proteins and the release of soluble factors. In this article, we report that in NK-DC cocultures, among a set of 84 cytokines investigated, activin A was the second highest induced gene, with CXCL8 being the most upregulated one. Activin A is a member of the TGF-β superfamily and was previously shown to possess both proinflammatory and anti-inflammatory activities. In NK-DC cocultures, the induction of activin A required cell contact and was dependent on the presence of proinflammatory cytokines (i.e., IFN-γ, TNF-α, and GM-CSF), as well as on NK cell-mediated DC killing. CD1(+) DCs were the main activin A producer cells among myeloid blood DC subsets. In NK-DC cocultures, inhibition of activin A by follistatin, a natural inhibitory protein, or by a specific blocking Ab, resulted in the upregulation of proinflammatory cytokine release (i.e., IL-6, IL-8, TNF-α) by DCs and in the increase of DC maturation. In conclusion, our study reports that activin A, produced during NK-DC interactions, represents a relevant negative feedback mechanism that might function to prevent excessive immune activation by DCs.
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Affiliation(s)
- Pascal Seeger
- Department of Molecular and Translational Medicine, University of Brescia, 25123 Brescia, Italy
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15
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Craig DG, Lee P, Pryde EA, Hidalgo E, Hayes PC, Wigmore SJ, Forbes SJ, Simpson KJ. Markedly Increased High-Mobility Group Box 1 Protein in a Patient with Small-for-Size Syndrome. Case Rep Transplant 2014; 2014:272498. [PMID: 24600525 PMCID: PMC3926239 DOI: 10.1155/2014/272498] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Accepted: 12/09/2013] [Indexed: 02/07/2023] Open
Abstract
Background. Small-for-size syndrome (SFSS) occurs in the presence of insufficient liver mass to maintain normal function after liver transplantation. Murine mortality following 85% hepatectomy can be reduced by the use of soluble receptor for advanced glycation end products (sRAGE) to scavenge damage-associated molecular patterns and prevent their engagement with membrane-bound RAGE. Aims. To explore serum levels of sRAGE, high-mobility group box-1 (HMGB1) protein, and other soluble inflammatory mediators in a fatal case of SFSS. Methods. Serum levels of HMGB1, sRAGE, IL-18, and other inflammatory mediators were measured by ELISA in a case of SFSS, and the results were compared with 8 patients with paracetamol-induced acute liver failure (ALF) and 6 healthy controls (HC). Results. HMGB1 levels were markedly higher in the SFSS patient (92.1 ng/mL) compared with the ALF patients (median (IQR) 11.4 (3.7-14.8) ng/mL) and HC (1.42 (1.38-1.56) ng/mL). In contrast, sRAGE levels were lower in the SFSS patient (1.88 ng/mL) compared with the ALF patients (3.53 (2.66-12.37) ng/mL) and were similar to HC levels (1.40 (1.23-1.89) ng/mL). Conclusion. These results suggest an imbalance between pro- and anti-inflammatory innate immune pathways in SFSS. Modulation of the HMGB1-RAGE axis may represent a future therapeutic avenue in this condition.
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Affiliation(s)
- Darren G. Craig
- 1Gastroenterology Department, The James Cook University Hospital, Marton Road, Middlesbrough TS4 3BW, UK
- *Darren G. Craig:
| | - Patricia Lee
- 2Division of Clinical and Surgical Sciences, University of Edinburgh, Edinburgh EH16 4SB, UK
| | - E. Anne Pryde
- 2Division of Clinical and Surgical Sciences, University of Edinburgh, Edinburgh EH16 4SB, UK
| | - Ernest Hidalgo
- 3Adult and Paediatric Liver Services, St James's University Hospital, Leeds LS9 7TF, UK
| | - Peter C. Hayes
- 2Division of Clinical and Surgical Sciences, University of Edinburgh, Edinburgh EH16 4SB, UK
| | - Stephen J. Wigmore
- 2Division of Clinical and Surgical Sciences, University of Edinburgh, Edinburgh EH16 4SB, UK
| | - Stuart J. Forbes
- 4MRC Centre for Inflammation Research, University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Kenneth J. Simpson
- 2Division of Clinical and Surgical Sciences, University of Edinburgh, Edinburgh EH16 4SB, UK
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16
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Li G, Liang X, Lotze MT. HMGB1: The Central Cytokine for All Lymphoid Cells. Front Immunol 2013; 4:68. [PMID: 23519706 PMCID: PMC3602962 DOI: 10.3389/fimmu.2013.00068] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Accepted: 03/01/2013] [Indexed: 12/21/2022] Open
Abstract
High-mobility group box 1 (HMGB1) is a leaderless cytokine, like the IL-1 and FGF family members, that has primary roles within the nucleus and the cytosol. Within the nucleus, it serves as another guardian of the genome, protecting it from oxidant injury and promoting access to transcriptional complexes such as nuclear hormone/nuclear hormone receptors and p53/p73 complexes. Within the cytosol it promotes autophagy and recruitment of the myddosome to Toll-like receptor (TLR) 9 vesicular compartments. Outside of the cell, it can either bind to specific receptors itself, or with high affinity to DNA, nucleosomes, IL-1β, lipopolysaccharide, and lipoteichoic acid to mediate responses in specific physiological or pathological conditions. Currently identified receptors include TLR2, TLR4, the receptor for advanced glycation end products, CD24-Siglec G/10, chemokine CXC receptor 4, and TIM-3. In terms of its effects or functions within lymphoid cells, HMGB1 is principally secreted from mature dendritic cells (DCs) to promote T-cell and B-cell reactivity and expansion and from activated natural killer cells to promote DC maturation during the afferent immune response. Some studies suggest that its primary role in the setting of chronic inflammation is to promote immunosuppression. As such, HMGB1 is a central cytokine for all lymphoid cells playing a role complementary to its better studied role in myeloid cells.
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Affiliation(s)
- Guanqiao Li
- The University of Pittsburgh Cancer Institute, University of Pittsburgh School of MedicinePittsburgh, PA, USA
- Department of Surgery, University of Pittsburgh School of MedicinePittsburgh, PA, USA
| | - Xiaoyan Liang
- The University of Pittsburgh Cancer Institute, University of Pittsburgh School of MedicinePittsburgh, PA, USA
- Department of Surgery, University of Pittsburgh School of MedicinePittsburgh, PA, USA
| | - Michael T. Lotze
- The University of Pittsburgh Cancer Institute, University of Pittsburgh School of MedicinePittsburgh, PA, USA
- Department of Surgery, University of Pittsburgh School of MedicinePittsburgh, PA, USA
- Department of Immunology, University of Pittsburgh School of MedicinePittsburgh, PA, USA
- Department of Bioengineering, University of Pittsburgh School of MedicinePittsburgh, PA, USA
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17
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Gougeon ML, Melki MT, Saïdi H. HMGB1, an alarmin promoting HIV dissemination and latency in dendritic cells. Cell Death Differ 2012; 19:96-106. [PMID: 22033335 PMCID: PMC3252828 DOI: 10.1038/cdd.2011.134] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 08/03/2011] [Accepted: 08/12/2011] [Indexed: 12/23/2022] Open
Abstract
Dendritic cells (DCs) initiate immune responses by transporting antigens and migrating to lymphoid tissues to initiate T-cell responses. DCs are located in the mucosal surfaces that are involved in human immunodeficiency virus (HIV) transmission and they are probably among the earliest targets of HIV-1 infection. DCs have an important role in viral transmission and dissemination, and HIV-1 has evolved different strategies to evade DC antiviral activity. High mobility group box 1 (HMGB1) is a DNA-binding nuclear protein that can act as an alarmin, a danger signal to alert the innate immune system for the initiation of host defense. It is the prototypic damage-associated molecular pattern molecule, and it can be secreted by innate cells, including DCs and natural killer (NK) cells. The fate of DCs is dependent on a cognate interaction with NK cells, which involves HMGB1 expressed at NK-DC synapse. HMGB1 is essential for DC maturation, migration to lymphoid tissues and functional type-1 polarization of naïve T cells. This review highlights the latest advances in our understanding of the impact of HIV on the interactions between HMGB1 and DCs, focusing on the mechanisms of HMGB1-dependent viral dissemination and persistence in DCs, and discussing the consequences on antiviral innate immunity, immune activation and HIV pathogenesis.
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Affiliation(s)
- M-L Gougeon
- Antiviral Immunity, Biotherapy and Vaccine Unit, Infection and Epidemiology Department, Institut Pasteur, Paris, France.
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18
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Zampell JC, Yan A, Avraham T, Andrade V, Malliaris S, Aschen S, Rockson SG, Mehrara BJ. Temporal and spatial patterns of endogenous danger signal expression after wound healing and in response to lymphedema. Am J Physiol Cell Physiol 2011; 300:C1107-21. [PMID: 21248077 DOI: 10.1152/ajpcell.00378.2010] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
While acute tissue injury potently induces endogenous danger signal expression, the role of these molecules in chronic wound healing and lymphedema is undefined. The purpose of this study was to determine the spatial and temporal expression patterns of the endogenous danger signals high-mobility group box 1 (HMGB1) and heat shock protein (HSP)70 during wound healing and chronic lymphatic fluid stasis. In a surgical mouse tail model of tissue injury and lymphedema, HMGB1 and HSP70 expression occurred along a spatial gradient relative to the site of injury, with peak expression at the wound and greater than twofold reduced expression within 5 mm (P < 0.05). Expression primarily occurred in cells native to injured tissue. In particular, HMGB1 was highly expressed by lymphatic endothelial cells (>40% positivity; twofold increase in chronic inflammation, P < 0.001). We found similar findings using a peritoneal inflammation model. Interestingly, upregulation of HMGB1 (2.2-fold), HSP70 (1.4-fold), and nuclear factor (NF)-κβ activation persisted at least 6 wk postoperatively only in lymphedematous tissues. Similarly, we found upregulation of endogenous danger signals in soft tissue of the arm after axillary lymphadenectomy in a mouse model and in matched biopsy samples obtained from patients with secondary lymphedema comparing normal to lymphedematous arms (2.4-fold increased HMGB1, 1.9-fold increased HSP70; P < 0.01). Finally, HMGB1 blockade significantly reduced inflammatory lymphangiogenesis within inflamed draining lymph nodes (35% reduction, P < 0.01). In conclusion, HMGB1 and HSP70 are expressed along spatial gradients and upregulated in chronic lymphatic fluid stasis. Furthermore, acute expression of endogenous danger signals may play a role in inflammatory lymphangiogenesis.
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Affiliation(s)
- Jamie C Zampell
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10065, USA
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19
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Dangerous attraction: phagocyte recruitment and danger signals of apoptotic and necrotic cells. Apoptosis 2010; 15:1007-28. [PMID: 20157780 DOI: 10.1007/s10495-010-0472-1] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Tissue homeostasis in metazoa requires the rapid and efficient clearance of dying cells by professional or semi-professional phagocytes. Impairment of this finely regulated, fundamental process has been implicated in the development of autoimmune diseases, such as systemic lupus erythematosus. Various studies have provided us a detailed understanding of the interaction between dying cells and phagocytes as well as the current concept that apoptotic cell removal leads to a non- or anti-inflammatory response, whereas necrotic cell removal stimulates a pro-inflammatory reaction. In contrast, our knowledge about the soluble factors released from dying cells is rather limited, although meanwhile it is generally accepted that not only the dying cell itself but also the substances liberated during cell death contribute to the process of corpse clearance and the subsequent immune response. This review article is intended as an up-to-date survey over attraction and danger signals of apoptotic, primary and secondary necrotic cells, their function as chemoattractants in phagocyte recruitment, additional effects on the immune system, and the receptors, which are engaged in this scenario.
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20
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Goff WL, Bastos RG, Brown WC, Johnson WC, Schneider DA. The bovine spleen: interactions among splenic cell populations in the innate immunologic control of hemoparasitic infections. Vet Immunol Immunopathol 2010; 138:1-14. [PMID: 20692048 DOI: 10.1016/j.vetimm.2010.07.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Revised: 07/08/2010] [Accepted: 07/12/2010] [Indexed: 11/17/2022]
Abstract
Over the past several years, innate immunity has been recognized as having an important role as a front-line defense mechanism and as an integral part of the adaptive immune response. Innate immunity in cattle exposed to hemoparasites is spleen-dependent and age-related. In this review, we discuss general aspects of innate immunity and the cells involved in this aspect of the response to infection. We also provide examples of specific splenic regulatory and effector mechanisms involved in the response to Babesia bovis, an important tick-borne hemoparasitic disease of cattle. Evidence for the regulatory and effector role of bovine splenic monocytes and DC both in directing a type-1 response through interaction with splenic NK cells and γδT-cells will be presented.
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Affiliation(s)
- W L Goff
- Animal Disease Research Unit, USDA-ARS, 3003 ADBF/WSU, Pullman, WA 99164-6630, USA
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21
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Chow MT, Teh H. H2‐M3‐restricted CD8
+
T cells augment CD4
+
T‐cell responses by promoting DC maturation. Eur J Immunol 2010; 40:1408-17. [DOI: 10.1002/eji.200939934] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Michael T. Chow
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC, Canada
| | - Hung‐Sia Teh
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC, Canada
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22
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Linking innate and adaptive immunity: human Vgamma9Vdelta2 T cells enhance CD40 expression and HMGB-1 secretion. Mediators Inflamm 2009; 2009:819408. [PMID: 19841752 PMCID: PMC2762119 DOI: 10.1155/2009/819408] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2009] [Accepted: 07/17/2009] [Indexed: 11/30/2022] Open
Abstract
γδ T cells play an important role in regulating the immune response to stress stimuli; however, the mean by which these innate lymphocytes fulfill this function remains
poorly defined. The main subset of human peripheral blood γδ T cells responds to
nonpeptidic antigens, such as isopentylpyrophosphate (IPP), a metabolite in the
mevalonate pathway for both eukaryote and prokaryote cells. IPP-primed γδ T cells
significantly augment the inflammatory response mediated by monocytes and αβ T cells
to TSST-1, the staphylococcal superantigen that is the major causative agent of toxic
shock syndrome. Here we show that the small pool of activated peripheral γδ T cells
induces an early upregulation of CD40 on monocytes and the local release of High
Mobility Group Box-1 (HMGB-1), the molecule designated as the late mediator of
systemic inflammation. This finding provides a new basis for how γδ T cells may serve
as influential modulators of both endogenous and exogenous stress stimuli.
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23
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Nguyen XD, Müller-Berghaus J, Kälsch T, Schadendorf D, Borggrefe M, Klüter H. Differentiation of monocyte-derived dendritic cells under the influence of platelets. Cytotherapy 2009; 10:720-9. [PMID: 18985478 DOI: 10.1080/14653240802378912] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
BACKGROUND Monocytapheresis has been established to collect a sufficient number of monocytes (MO) for differentiation to dendritic cells (DC) as a cancer vaccine. Platelets (Plt) are invariably found as a contaminant in the final monocytapheresis product. The aim of this study was to investigate DC differentiation under the influence of Plt with regard to their function and phenotype. METHODS MO were isolated and co-cultured with autologous Plt at different MO:Plt ratios (1:1.7, 1:5, 1:15, 1:45 and 1:135) in the presence of interleukin-4 (IL-4) and granulocyte-macrophage colony-stimulating factor (GM-CSF). IL-12p70 release after ligation of CD40L was determined in the supernatant by enzyme-linked immunosorbent assay (ELISA). For T-cell stimulation, tetanus toxoid was added to immature DC and maturation was induced by adding cytokines (IL-1beta, IL-6, tumor necrosis factor-alpha and prostaglandin E(2)). Stimulated T cells were analyzed for activation and proliferation as well as for intracellular cytokines by flow cytometry. RESULTS All DC cultures were strongly positive for CD83. At a contaminating concentration of 5 Plt/MO, matured DC showed the highest expression of HLA-DR, CD80 and CD86, inducing a strong T-cell proliferation with high production of IL-4 and interferon-gamma. The highest level of IL-12p70 production was observed by the same DC group. DISCUSSION Plt did not negatively influence DC maturation but enhanced the expression of co-stimulatory molecules and the release of IL-12. Functionally this was reflected by a strong T-cell response that involved T-helper 1 (Th1)- as well as Th2-biased T cells. Our findings show that controlling the Plt concentration may provide important advantages for the generation of DC for use in immunotherapy.
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Affiliation(s)
- X D Nguyen
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, Red-Cross Blood Donation Service of Baden-Wurttemberg-Hessen, Germany.
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Rölle A, Olweus J. Dendritic cells in cytomegalovirus infection: viral evasion and host countermeasures. APMIS 2009; 117:413-26. [PMID: 19400865 DOI: 10.1111/j.1600-0463.2009.02449.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Human cytomegalovirus (HCMV) is a beta-herpesvirus that infects the majority of the population during early childhood and thereafter establishes life-long latency. Primary infection as well as spontaneous reactivation usually remains asymptomatic in healthy hosts but can, in the context of systemic immunosuppression, result in substantial morbidity and mortality. HCMV counteracts the host immune response by interfering with the recognition of infected cells. A growing body of literature has also suggested that the virus evades the immune system by paralyzing the initiators of antiviral immune responses--the dendritic cells (DCs). In the current review, we discuss the effects of CMV (HCMV and murine CMV) on various DC subsets and the ensuing innate and adaptive immune responses. The impact of HCMV on DCs has mainly been investigated using monocyte-derived DCs, which are rendered functionally impaired by infection. In mouse models, DCs are targets of viral evasion as well, but the complex cross-talk between DCs and natural killer cells has, however, demonstrated an instrumental role for DCs in the control and clearance of viral infection. Fewer studies address the role of peripheral blood DC subsets, plasmacytoid DCs and CD11c+ myeloid DCs in the response against HCMV. These DCs, rather than being paralyzed by HCMV, are largely resistant to infection, mount a vigorous first-line defense and induce T-cell responses to the virus. This possibly provides a partial explanation for an intriguing conundrum: the highly efficient control of viral infection and reactivation in immunocompetent hosts in spite of multi-layered viral evasion mechanisms.
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Affiliation(s)
- Alexander Rölle
- Department of Immunology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo University Hospital, University of Oslo, Oslo, Norway.
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Staphylococcal toxic shock syndrome toxin-1 induces the translocation and secretion of high mobility group-1 protein from both activated T cells and monocytes. Mediators Inflamm 2008; 2008:512196. [PMID: 19009026 PMCID: PMC2581724 DOI: 10.1155/2008/512196] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2008] [Accepted: 09/26/2008] [Indexed: 11/17/2022] Open
Abstract
High mobility group box-1 (HMGB-1) is a DNA-binding protein secreted by
activated monocytes and has been identified as a key late mediator of endotoxic shock. We investigated the regulation of HMGB-1 in human peripheral blood mononuclear cells (PBMCs) following stimulation with the staphylococcal superantigen, toxic shock syndrome toxin-1 (TSST-1), and found that TSST-1, like LPS, induced the secretion of HMGB-1 from human PBMC. However, unlike monocyte-driven sepsis caused by endotoxin, translocation and secretion of HMGB-1 mediated by TSST-1 was dependent on the presence of both activated T cells and monocytes. Furthermore, we show that nuclear HMGB-1 is released from TSST-1 stimulated T cells. This finding presents a basis for investigating the potential of targeting HMGB-1 for the treatment of toxic shock syndrome, and provides further insight on the role of HMGB-1 in the cross-talk between activated monocytes and T cells.
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Ceccarelli J, Delfino L, Zappia E, Castellani P, Borghi M, Ferrini S, Tosetti F, Rubartelli A. The redox state of the lung cancer microenvironment depends on the levels of thioredoxin expressed by tumor cells and affects tumor progression and response to prooxidants. Int J Cancer 2008; 123:1770-8. [PMID: 18661523 DOI: 10.1002/ijc.23709] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Here we report that human nonsmall cell lung carcinomas overexpress macrophage migration inhibitory factor (MIF) and thioredoxin (Trx), 2 oxidoreductases with cytokine function, and contain more abundant nonprotein thiols (glutathione and cysteine) than nonneoplastic lung tissues. Cell clones derived from the same lung carcinoma cell lines but expressing different levels of Trx and/or MIF displayed growth rates in vitro and in vivo correlating with Trx but not with MIF. Interestingly, the different clones generate extracellularly reduced nonprotein thiols, in amounts related to the Trx content and inhibited by inhibitors of Trx function. Each clone also showed distinct responses to the prooxidant compound arsenic trioxide. Cells with a strongly antioxidant and aggressive phenotype were more susceptible to the cytotoxic effect of the drug than cells expressing little Trx. The latter counteracted the oxidative stress by increasing Trx expression and thiol release. Together these results indicate that different human lung cancer cell lines have distinct redox properties defined by the levels of Trx and nonprotein thiols, the higher antioxidant phenotype correlating with the higher aggressiveness. Moreover, the redox phenotype dictates their response to prooxidant drugs and must be taken into account when therapeutic interventions with redox active substances are considered.
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Affiliation(s)
- Jenny Ceccarelli
- Cell Biology Unit, National Cancer Research Institute, Genoa, Italy
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Iannello A, Debbeche O, Samarani S, Ahmad A. Antiviral NK cell responses in HIV infection: II. viral strategies for evasion and lessons for immunotherapy and vaccination. J Leukoc Biol 2008; 84:27-49. [PMID: 18388299 DOI: 10.1189/jlb.0907649] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
As is the case in other viral infections, humans respond to HIV infection by activating their NK cells. However, the virus uses several strategies to neutralize and evade the host's NK cell responses. Consequently, it is not surprising that NK cell functions become compromised in HIV-infected individuals in early stages of the infection. The compromised NK cell functions also adversely affect several aspects of the host's antiviral adaptive immune responses. Researchers have made significant progress in understanding how HIV counters NK cell responses of the host. This knowledge has opened new avenues for immunotherapy and vaccination against this infection. In the first part of this review article, we gave an overview of our current knowledge of NK cell biology and discussed how the genes encoding NK cell receptors and their ligands determine innate genetic resistance/susceptibilty of humans against HIV infections and AIDS. In this second part, we discuss NK cell responses, viral strategies to counter these responses, and finally, their implications for anti-HIV immunotherapy and vaccination.
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Affiliation(s)
- Alexandre Iannello
- Laboratory of Innate Immunity, Center of Research Ste Justine Hospital, 3175 Côte Ste-Catherine, Montreal, Qc, H3T 1C5, Canada
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Sundberg E, Grundtman C, Af Klint E, Lindberg J, Ernestam S, Ulfgren AK, Harris HE, Andersson U. Systemic TNF blockade does not modulate synovial expression of the pro-inflammatory mediator HMGB1 in rheumatoid arthritis patients--a prospective clinical study. Arthritis Res Ther 2008; 10:R33. [PMID: 18346273 PMCID: PMC2452983 DOI: 10.1186/ar2387] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2007] [Revised: 02/26/2008] [Accepted: 03/17/2008] [Indexed: 01/12/2023] Open
Abstract
Introduction High-mobility group box chromosomal protein 1 (HMGB1) has recently been identified as an endogenous mediator of arthritis. TNF and IL-1β, pivotal cytokines in arthritis pathogenesis, both have the ability to induce the release of HMGB1 from myeloid and dendritic cells. It was, therefore, decided to investigate whether treatment based on TNF blockade in rheumatoid arthritis (RA) affects the expression of synovial HMGB1. Methods Repeated arthroscopy-guided sampling of synovial tissue was performed in nine patients with RA before and nine weeks after initiation of anti-TNF mAb (infliximab) therapy. Synovial biopsy specimens were analysed for HMGB1 protein by immunohistochemical staining and for HMGB1 mRNA expression by real-time reverse transcriptase PCR (RT-PCR). Statistical evaluations were based on Wilcoxon's signed rank tests or Spearman rank sum tests. Results Aberrant, extranuclear HMGB1 and constitutive nuclear HMGB1 expression, with histological signs of inflammation, were evident in all biopsies obtained before infliximab therapy. Signs of inflammation were still evident in the second biopsies obtained nine weeks after initiation of infliximab therapy. The cytoplasmic and extracellular expression of HMGB1 decreased in five patients, remained unchanged in one patient and increased in three patients, making the overall change in HMGB1 protein expression not significant. No correlation between the clinical response, as measured by disease activity score calculated for 28 joints (DAS28) or the American College of Rheumatology response criteria (ACR 20, 50, and 70), and the direction of change of HMGB1 expression in individual patients could be discerned. In addition, infliximab therapy did not alter HMGB1 mRNA synthesis. Conclusion Pro-inflammatory HMGB1 expression during rheumatoid synovitis was not consistently influenced by TNF-blocking therapy with infliximab. This suggests that TNF is not the main inducer of extranuclear HMGB1 during synovitis and that HMGB1 may represent a TNF-independent molecule that could be considered as a possible target for future therapeutic intervention in RA.
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Affiliation(s)
- Erik Sundberg
- Department of Woman and Child Health, Pediatric Rheumatology Research Unit, Karolinska Institutet/Karolinska University Hospital, Stockholm, Sweden.
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Zanoni I, Granucci F, Foti M, Ricciardi-Castagnoli P. Self-tolerance, dendritic cell (DC)-mediated activation and tissue distribution of natural killer (NK) cells. Immunol Lett 2007; 110:6-17. [PMID: 17451813 DOI: 10.1016/j.imlet.2007.03.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2007] [Revised: 03/06/2007] [Accepted: 03/07/2007] [Indexed: 12/16/2022]
Abstract
Natural killer (NK) cells are lymphocytes of the innate immune system that exert a potent function against infected and tumor cells. Although NK cells were originally defined by their capacity to lyse target cells and produce interferon (IFN)-gamma without prior activation, more recent studies found that NK cells display also a potent regulatory function. Following engagement of surface receptors by other cells or signalling by soluble molecules, NK cells release cytokines able to influence the outcome of an immune response. Since their discovery in the 1970s, the biology of NK cells has been deeply investigated; nevertheless some aspects of their maturation process, activation mechanisms, and tissue distribution remain still obscure. These review will focus on three major issues regarding NK cell regulation. In particular we aim to discuss: (i) how NK cells become tolerant to self-tissues during their maturation; (ii) how NK cells become activated, with a particular attention to dendritic cell (DC)-mediated mechanisms of NK cell priming; (iii) where NK cells play their functions and how NK cell tissue distribution can favour their capacity to skew T cell responses.
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Affiliation(s)
- Ivan Zanoni
- University of Milano-Bicocca, Department of Biotechnology and Bioscience, P.zza della Scienza 2, 20126 Milan, Italy.
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Lotze MT, Deisseroth A, Rubartelli A. Damage associated molecular pattern molecules. Clin Immunol 2007; 124:1-4. [PMID: 17468050 PMCID: PMC2000827 DOI: 10.1016/j.clim.2007.02.006] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2007] [Accepted: 02/15/2007] [Indexed: 01/11/2023]
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Abstract
Multicellular animals detect pathogens via a set of receptors that recognize pathogen-associated molecular patterns (PAMPs). However, pathogens are not the only causative agents of tissue and cell damage: trauma is another one. Evidence is accumulating that trauma and its associated tissue damage are recognized at the cell level via receptor-mediated detection of intracellular proteins released by the dead cells. The term "alarmin" is proposed to categorize such endogenous molecules that signal tissue and cell damage. Intriguingly, effector cells of innate and adaptive immunity can secrete alarmins via nonclassical pathways and often do so when they are activated by PAMPs or other alarmins. Endogenous alarmins and exogenous PAMPs therefore convey a similar message and elicit similar responses; they can be considered subgroups of a larger set, the damage-associated molecular patterns (DAMPs).
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Affiliation(s)
- Marco E Bianchi
- San Raffaele University, Chromatin Dynamics Unit, via Olgettina 58, 20132 Milan, Italy.
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