1
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Liao D, Su X, Wang J, Yu J, Luo H, Tian W, Ye Z, He J. Pushing the envelope: Immune mechanism and application landscape of macrophage-activating lipopeptide-2. Front Immunol 2023; 14:1113715. [PMID: 36761746 PMCID: PMC9902699 DOI: 10.3389/fimmu.2023.1113715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 01/10/2023] [Indexed: 01/25/2023] Open
Abstract
Mycoplasma fermentans can cause respiratory diseases, arthritis, genitourinary tract infections, and chronic fatigue syndrome and have been linked to the development of the human immunodeficiency virus. Because mycoplasma lacks a cell wall, its outer membrane lipoproteins are one of the main factors that induce inflammation in the organism and contribute to disease development. Macrophage-activating lipopeptide-2 (MALP-2) modulates the inflammatory response of monocytes/macrophages in a bidirectional fashion, indirectly enhances the cytotoxicity of NK cells, promotes oxidative bursts in neutrophils, upregulates surface markers on lymphocytes, enhances antigen presentation on dendritic cells and induces immune inflammatory responses in sebocytes and mesenchymal cells. MALP-2 is a promising vaccine adjuvant for this application. It also promotes vascular healing and regeneration, accelerates wound and bone healing, suppresses tumors and metastasis, and reduces lung infections and inflammation. MALP-2 has a simple structure, is easy to synthesize, and has promising prospects for clinical application. Therefore, this paper reviews the mechanisms of MALP-2 activation in immune cells, focusing on the application of MALP-2 in animals/humans to provide a basis for the study of pathogenesis in Mycoplasma fermentans and the translation of MALP-2 into clinical applications.
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Affiliation(s)
- Daoyong Liao
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Xiaoling Su
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jingyun Wang
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jianwei Yu
- Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, Hunan, China
| | - Haodang Luo
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China,Institute of Pathogenic Biology, Hengyang Medical School, Hunan Provincial Key Laboratory for Special Pathogens Prevention and Control, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, China
| | - Wei Tian
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Zufeng Ye
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China
| | - Jun He
- The Affiliated Nanhua Hospital, Department of Clinical Laboratory, Hengyang Medical School, University of South China, Hengyang, China,*Correspondence: Jun He,
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2
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Abstract
Self-adjuvanting vaccines, covalent conjugates between antigens and adjuvants, are chemically well-defined compared with conventional vaccines formulated through mixing antigens with adjuvants. Innate immune receptor ligands effectively induce acquired immunity through the activation of innate immunity, thereby enhancing host immune responses. Thus, innate immune receptor ligands are often used as adjuvants in self-adjuvanting vaccines. In a self-adjuvanting vaccine, the covalent linkage of antigen and adjuvant enables their simultaneous uptake into immune cells where the adjuvant consequently induces antigen-specific immune responses. Importantly, self-adjuvanting vaccines do not require immobilization to carrier proteins or co-administration of additional adjuvants and thus avoid inducing undesired immune responses. Because of these excellent properties, self-adjuvanting vaccines are expected to be candidates for next-generation vaccines. Here, we take an overview of vaccine adjuvants, mainly focusing on those utilized in self-adjuvanting vaccines and then we review recent reports on self-adjuvanting conjugate vaccines.
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3
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Orlacchio A, Mazzone P. The Role of Toll-like Receptors (TLRs) Mediated Inflammation in Pancreatic Cancer Pathophysiology. Int J Mol Sci 2021; 22:12743. [PMID: 34884547 PMCID: PMC8657588 DOI: 10.3390/ijms222312743] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 11/18/2021] [Accepted: 11/22/2021] [Indexed: 12/12/2022] Open
Abstract
Pancreatic cancer (PC) is one of the most lethal forms of cancer, characterized by its aggressiveness and metastatic potential. Despite significant improvements in PC treatment and management, the complexity of the molecular pathways underlying its development has severely limited the available therapeutic opportunities. Toll-like receptors (TLRs) play a pivotal role in inflammation and immune response, as they are involved in pathogen-associated molecular patterns (PAMPs) and danger-associated molecular patterns (DAMPs). Activation of TLRs initiates a signaling cascade, which in turn, leads to the transcription of several genes involved in inflammation and anti-microbial defense. TLRs are also deregulated in several cancers and can be used as prognostic markers and potential targets for cancer-targeted therapy. In this review we discuss the current knowledge about the role of TLRs in PC progression, focusing on the available TLRs-targeting compounds and their possible use in PC therapy.
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Affiliation(s)
- Arturo Orlacchio
- NYU Grossman School of Medicine, NYU Langone Health, New York, NY 10016, USA
| | - Pellegrino Mazzone
- Biogem Scarl, Istituto di Ricerche Genetiche Gaetano Salvatore, 83031 Ariano Irpino, Italy
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4
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Manabe Y, Chang TC, Fukase K. Recent advances in self-adjuvanting glycoconjugate vaccines. DRUG DISCOVERY TODAY. TECHNOLOGIES 2020; 37:61-71. [PMID: 34895656 DOI: 10.1016/j.ddtec.2020.11.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 07/21/2020] [Accepted: 11/26/2020] [Indexed: 01/02/2023]
Abstract
Compared to traditional vaccines that are formulated into mixtures of an adjuvant and an antigen, a self-adjuvanting vaccine consists of an antigen that is covalently conjugated to a well-defined adjuvant. In self-adjuvanting vaccines, innate immune receptor ligands are usually used as adjuvants. Innate immune receptor ligands effectively trigger acquired immunity through the activation of innate immunity to enhance host immune responses to antigens. When a self-adjuvanting vaccine is used, immune cells simultaneously uptake the antigen and the adjuvant because they are covalently linked. Consequently, the adjuvant can specifically induce immune responses against the conjugated antigen. Importantly, self-adjuvanting vaccines do not require co-administration of additional adjuvants or immobilization to carrier proteins, which enables avoidance of the use of highly toxic adjuvants or the induction of undesired immune responses. Given these excellent properties, self-adjuvanting vaccines are expected to serve as candidates for the next generation of vaccines. Herein, we review vaccine adjuvants, with a focus on the adjuvants used in self-adjuvanting vaccines, and then overview recent advances made with self-adjuvanting conjugate vaccines.
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Affiliation(s)
- Yoshiyuki Manabe
- Department of Chemistry, Graduate School of Science, Osaka University, Japan; Core for Medicine and Science Collaborative Research and Education, Project Research Center for Fundamental Sciences, Graduate School of Science, Osaka University, Japan.
| | - Tsung-Che Chang
- Department of Chemistry, Graduate School of Science, Osaka University, Japan
| | - Koichi Fukase
- Department of Chemistry, Graduate School of Science, Osaka University, Japan; Core for Medicine and Science Collaborative Research and Education, Project Research Center for Fundamental Sciences, Graduate School of Science, Osaka University, Japan.
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5
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Haidl ID, Meghnem D, Issekutz TB, Marshall JS. Toll-like receptor 2 activation induces C-C chemokine receptor 2-dependent natural killer cell recruitment to the peritoneum. Immunol Cell Biol 2020; 98:854-867. [PMID: 32696994 PMCID: PMC7754274 DOI: 10.1111/imcb.12379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 06/30/2020] [Accepted: 07/19/2020] [Indexed: 12/14/2022]
Abstract
Natural killer (NK) cells are innate effector cells with critical roles not only in tumor immunosurveillance and viral immunity, but also in bacterial and fungal infections. Toll‐like receptor 2 (TLR2) can be important in the early and sustained immune responses to pathogens and tumors through the induction of cytokines and chemokines that recruit and activate immune effector cells. We investigated the role of TLR2 activation in NK cell recruitment with a view to informing approaches to induce or regulate peritoneal NK cell responses therapeutically. Peritoneal injection of TLR2 activators, including peptidoglycan and the lipopeptides FSL‐1 and Pam3CSK4, resulted in NK cell recruitment after 16 h with increased NK cell numbers maintained for 48 h. TLR2 activators induced large amounts of CCR2 ligands, but much smaller amounts of CCR5 and CXCR3 ligands. Consistent with this observation, NK cell migration was abrogated in CCR2‐deficient mice after peritoneal FSL‐1 injection. Adoptive transfer of CCR2‐deficient NK cells prior to peritoneal FSL‐1 activation confirmed a cell‐intrinsic component of CCR2‐mediated NK cell migration. TLR2 activation did not induce an activated NK cell phenotype, but significant changes included an increase in the KLRG1+ subset and decreased NKG2D expression. Although not activated in vivo, peritoneal NK cells could be activated by interleukin (IL)‐12 and IL‐18 ex vivo to express CD69 and interferonγ. These data demonstrate that TLR2‐mediated immune activation is a potent inducer of NK cell recruitment via a CCR2‐dependent mechanism and that NK cells recruited by this mechanism can respond to additional signals to exert effector cell functions.
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Affiliation(s)
- Ian D Haidl
- Dalhousie Human Immunology and Inflammation Group, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Dihia Meghnem
- Dalhousie Human Immunology and Inflammation Group, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Thomas B Issekutz
- Dalhousie Human Immunology and Inflammation Group, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Pediatrics, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Jean S Marshall
- Dalhousie Human Immunology and Inflammation Group, Dalhousie University, Halifax, Nova Scotia, Canada.,Department of Microbiology and Immunology, Dalhousie University, Halifax, Nova Scotia, Canada.,IWK Health Centre, Halifax, Nova Scotia, Canada
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6
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Nguyen BN, Chávez-Arroyo A, Cheng MI, Krasilnikov M, Louie A, Portnoy DA. TLR2 and endosomal TLR-mediated secretion of IL-10 and immune suppression in response to phagosome-confined Listeria monocytogenes. PLoS Pathog 2020; 16:e1008622. [PMID: 32634175 PMCID: PMC7340287 DOI: 10.1371/journal.ppat.1008622] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 05/12/2020] [Indexed: 01/24/2023] Open
Abstract
Listeria monocytogenes is a facultative intracellular bacterial pathogen that escapes from phagosomes and induces a robust adaptive immune response in mice, while mutants unable to escape phagosomes fail to induce a robust adaptive immune response and suppress the immunity to wildtype bacteria when co-administered. The capacity to suppress immunity can be reversed by blocking IL-10. In this study, we sought to understand the host receptors that lead to secretion of IL-10 in response to phagosome-confined L. monocytogenes (Δhly), with the ultimate goal of generating strains that fail to induce IL-10. We conducted a transposon screen to identify Δhly L. monocytogenes mutants that induced significantly more or less IL-10 secretion in bone marrow-derived macrophages (BMMs). A transposon insertion in lgt, which encodes phosphatidylglycerol-prolipoprotein diacylglyceryl transferase and is essential for the formation of lipoproteins, induced significantly reduced IL-10 secretion. Mutants with transposon insertions in pgdA and oatA, which encode peptidoglycan N-acetylglucosamine deacetylase and O-acetyltransferase, are sensitive to lysozyme and induced enhanced IL-10 secretion. A ΔhlyΔpgdAΔoatA strain was killed in BMMs and induced enhanced IL-10 secretion that was dependent on Unc93b1, a trafficking molecule required for signaling of nucleic acid-sensing TLRs. These data revealed that nucleic acids released by bacteriolysis triggered endosomal TLR-mediated IL-10 secretion. Secretion of IL-10 in response to infection with the parental strain was mostly TLR2-dependent, while IL-10 secretion in response to lysozyme-sensitive strains was dependent on TLR2 and Unc93b1. In mice, the IL-10 response to vacuole-confined L. monocytogenes was also dependent on TLR2 and Unc93b1. Co-administration of Δhly and ΔactA resulted in suppressed immunity in WT mice, but not in mice with mutations in Unc93b1. These data revealed that secretion of IL-10 in response to L. monocytogenes infection in vitro is mostly TLR2-dependent and immune suppression by phagosome-confined bacteria in vivo is mostly dependent on endosomal TLRs.
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Affiliation(s)
- Brittney N. Nguyen
- Graduate Group in Microbiology, University of California, Berkeley, Berkeley, California, United States of America
| | - Alfredo Chávez-Arroyo
- Graduate Group in Microbiology, University of California, Berkeley, Berkeley, California, United States of America
| | - Mandy I. Cheng
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California, United States of America
| | - Maria Krasilnikov
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California, United States of America
| | - Alexander Louie
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California, United States of America
| | - Daniel A. Portnoy
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California, United States of America
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, California, United States of America
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7
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Christodoulides A, Gupta N, Yacoubian V, Maithel N, Parker J, Kelesidis T. The Role of Lipoproteins in Mycoplasma-Mediated Immunomodulation. Front Microbiol 2018; 9:1682. [PMID: 30108558 PMCID: PMC6080569 DOI: 10.3389/fmicb.2018.01682] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Accepted: 07/05/2018] [Indexed: 01/16/2023] Open
Abstract
Mycoplasma infections, such as walking pneumonia or pelvic inflammatory diseases, are a major threat to public health. Despite their relatively small physical and genomic size, mycoplasmas are known to elicit strong host immune responses, generally inflammatory, while also being able to evade the immune system. The mycoplasma membrane is composed of approximately two-thirds protein and one-third lipid and contains several lipoproteins that are known to regulate host immune responses. Herein, the immunomodulatory effects of mycoplasma lipoproteins are reviewed. A better understanding of the immunomodulatory effects, both activating and evasive, of Mycoplasma surface lipoproteins will contribute to understanding mechanisms potentially relevant to mycoplasma disease vaccine development and treatment.
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Affiliation(s)
- Alexei Christodoulides
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Neha Gupta
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Vahe Yacoubian
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Neil Maithel
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Jordan Parker
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
| | - Theodoros Kelesidis
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, United States
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8
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Chang T, Manabe Y, Fujimoto Y, Ohshima S, Kametani Y, Kabayama K, Nimura Y, Lin C, Fukase K. Syntheses and Immunological Evaluation of Self‐Adjuvanting Clustered
N
‐Acetyl and
N
‐Propionyl Sialyl‐Tn Combined with a T‐helper Cell Epitope as Antitumor Vaccine Candidates. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804437] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tsung‐Che Chang
- Department of ChemistryGraduate School of ScienceOsaka University 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
| | - Yoshiyuki Manabe
- Department of ChemistryGraduate School of ScienceOsaka University 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
- Core for Medicine and Science Collaborative Research and EducationProject Research Center for Fundamental ScienceOsaka University 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
| | - Yukari Fujimoto
- Department of ChemistryFaculty of Science and TechnologyKeio University 3-14-1 Hiyoshi Kohoku-ku Yokohama, Kanagawa 223-8522 Japan
| | - Shino Ohshima
- Faculty of MedicineSchool of MedicineTokai University 143 Shimokasuya, Isehara-shi Kanagawa 259-1193 Japan
| | - Yoshie Kametani
- Faculty of MedicineSchool of MedicineTokai University 143 Shimokasuya, Isehara-shi Kanagawa 259-1193 Japan
| | - Kazuya Kabayama
- Department of ChemistryGraduate School of ScienceOsaka University 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
- Core for Medicine and Science Collaborative Research and EducationProject Research Center for Fundamental ScienceOsaka University 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
| | - Yuka Nimura
- Department of ChemistryGraduate School of ScienceOsaka University 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
| | - Chun‐Cheng Lin
- Department of ChemistryNational Tsing Hua University 101 Sec. 2, Kuang Fu Rd. Hsinchu 30013 Taiwan
| | - Koichi Fukase
- Department of ChemistryGraduate School of ScienceOsaka University 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
- Core for Medicine and Science Collaborative Research and EducationProject Research Center for Fundamental ScienceOsaka University 1-1 Machikaneyama, Toyonaka Osaka 560-0043 Japan
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9
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Chang TC, Manabe Y, Fujimoto Y, Ohshima S, Kametani Y, Kabayama K, Nimura Y, Lin CC, Fukase K. Syntheses and Immunological Evaluation of Self-Adjuvanting Clustered N-Acetyl and N-Propionyl Sialyl-Tn Combined with a T-helper Cell Epitope as Antitumor Vaccine Candidates. Angew Chem Int Ed Engl 2018; 57:8219-8224. [PMID: 29768704 DOI: 10.1002/anie.201804437] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 05/14/2018] [Indexed: 01/08/2023]
Abstract
Sialyl-Tn (STn) is a tumor-associated carbohydrate antigen (TACA) rarely observed on healthy tissues. We synthesized two fully synthetic N-acetyl and N-propionyl STn trimer (triSTn) vaccines possessing a T-helper epitope and a TLR2 agonist, since the clustered STn antigens are highly expressed on many cancer cells. Immunization of both vaccines in mice induced the anti-triSTn IgG antibodies, which recognized triSTn-expressing cell lines PANC-1 and HepG2. The N-propionyl triSTn vaccine induced the triSTn-specific IgGs, while IgGs induced by the N-acetyl triSTn vaccine were less specific. These results illustrated that N-propionyl triSTn is a valuable unnatural TACA for anticancer vaccines.
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Affiliation(s)
- Tsung-Che Chang
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
| | - Yoshiyuki Manabe
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan.,Core for Medicine and Science Collaborative Research and Education, Project Research Center for Fundamental Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
| | - Yukari Fujimoto
- Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa, 223-8522, Japan
| | - Shino Ohshima
- Faculty of Medicine, School of Medicine, Tokai University, 143 Shimokasuya, Isehara-shi, Kanagawa, 259-1193, Japan
| | - Yoshie Kametani
- Faculty of Medicine, School of Medicine, Tokai University, 143 Shimokasuya, Isehara-shi, Kanagawa, 259-1193, Japan
| | - Kazuya Kabayama
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan.,Core for Medicine and Science Collaborative Research and Education, Project Research Center for Fundamental Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
| | - Yuka Nimura
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
| | - Chun-Cheng Lin
- Department of Chemistry, National Tsing Hua University, 101 Sec. 2, Kuang Fu Rd., Hsinchu, 30013, Taiwan
| | - Koichi Fukase
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan.,Core for Medicine and Science Collaborative Research and Education, Project Research Center for Fundamental Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka, 560-0043, Japan
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10
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Takeda Y, Azuma M, Hatsugai R, Fujimoto Y, Hashimoto M, Fukase K, Matsumoto M, Seya T. The second and third amino acids of Pam2 lipopeptides are key for the proliferation of cytotoxic T cells. Innate Immun 2018; 24:323-331. [PMID: 29848176 PMCID: PMC6830919 DOI: 10.1177/1753425918777598] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The TLR2 agonist, dipalmitoyl lipopeptide (Pam2LP), has been used as an immune
adjuvant without much success. Pam2LP is recognised by TLR2/6 receptors in
humans and in mice. This study examined the proliferative activity of cytotoxic
T lymphocytes (CTL) using mouse Ag-presenting dendritic cells (DCs) and OT-I
assay system, where a library of synthetic Pam2LP was utilised from the
Staphylococcus aureus database. Ag-specific CTL expansion
and IFN-γ levels largely depended on the Pam2LP peptide sequence. The first Aa
is cysteine (Cys), which has an active SH residue to bridge fatty acids, and the
second and third Aa are hydrophilic or non-polar. The sequence structurally
adapted to the residual constitution of the reported TLR2/6 pocket. The inactive
sequence contained proline or leucine/isoleucine after the first Cys. Notably,
no direct activation of OT-I cells was detected without DCs by stimulation with
the active Pam2LP having the Cys-Ser sequence. MyD88, but not TICAM-1 or IFN
pathways, in DCs participates in DC maturation characterised by upregulation of
CD40, CD80 and CD86. Hence, the active Pam2LPs appear suitable for dimeric
TLR2/6 on DCs, resulting in induction of DC maturation.
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Affiliation(s)
- Yohei Takeda
- 1 Department of Vaccine Immunology, Graduate School of Medicine, Hokkaido University, Japan
| | - Masahiro Azuma
- 1 Department of Vaccine Immunology, Graduate School of Medicine, Hokkaido University, Japan
| | - Ryoko Hatsugai
- 1 Department of Vaccine Immunology, Graduate School of Medicine, Hokkaido University, Japan
| | - Yukari Fujimoto
- 2 Faculty of Science and Technology, Keio University, Japan.,3 Department of Chemistry, Graduate School of Science, Osaka University, Japan
| | - Masahito Hashimoto
- 4 Department of Nanostructure and Advanced Materials, Kagoshima University, Japan
| | - Koichi Fukase
- 3 Department of Chemistry, Graduate School of Science, Osaka University, Japan
| | - Misako Matsumoto
- 1 Department of Vaccine Immunology, Graduate School of Medicine, Hokkaido University, Japan
| | - Tsukasa Seya
- 1 Department of Vaccine Immunology, Graduate School of Medicine, Hokkaido University, Japan
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11
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Takeda Y, Azuma M, Funami K, Shime H, Matsumoto M, Seya T. Type I Interferon-Independent Dendritic Cell Priming and Antitumor T Cell Activation Induced by a Mycoplasma fermentans Lipopeptide. Front Immunol 2018; 9:496. [PMID: 29593736 PMCID: PMC5861346 DOI: 10.3389/fimmu.2018.00496] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 02/26/2018] [Indexed: 12/12/2022] Open
Abstract
Mycoplasma fermentans-derived diacylated lipoprotein M161Ag (MALP404) is recognized by human/mouse toll-like receptor (TLR) 2/TLR6. Short proteolytic products including macrophage-activating lipopeptide 2 (MALP2) have been utilized as antitumor immune-enhancing adjuvants. We have chemically synthesized a short form of MALP2 named MALP2s (S-[2,3-bis(palmitoyloxy)propyl]-CGNNDE). MALP2 and MALP2s provoke natural killer (NK) cell activation in vitro but only poorly induce tumor regression using in vivo mouse models loading NK-sensitive tumors. Here, we identified the functional mechanism of MALP2s on dendritic cell (DC)-priming and cytotoxic T lymphocyte (CTL)-dependent tumor eradication using CTL-sensitive tumor-implant models EG7 and B16-OVA. Programmed death ligand-1 (PD-L1) blockade therapy in combination with MALP2s + ovalbumin (OVA) showed a significant additive effect on tumor growth suppression. MALP2s increased co-stimulators CD80/86 and CD40, which were totally MyD88-dependent, with no participation of toll-IL-1R homology domain-containing adaptor molecule-1 or type I interferon signaling in DC priming. MALP2s + OVA consequently augmented proliferation of OVA-specific CTLs in the spleen and at tumor sites. Chemokines and cytolytic factors were upregulated in the tumor. Strikingly, longer duration and reinvigoration of CTLs in spleen and tumors were accomplished by the addition of MALP2s + OVA to α-PD-L1 antibody (Ab) therapy compared to α-PD-L1 Ab monotherapy. Then, tumors regressed better in the MALP2s/OVA combination than in the α-PD-L1 Ab monotherapy. Hence, MALP2s/tumor-associated antigens combined with α-PD-L1 Ab is a good therapeutic strategy in some mouse models. Unfortunately, numerous patients are still resistant to PD-1/PD-L1 blockade, and good DC-priming adjuvants are desired. Cytokine toxicity by MALP2s remains to be settled, which should be improved by chemical modification in future studies.
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Affiliation(s)
- Yohei Takeda
- Department of Vaccine Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Masahiro Azuma
- Department of Vaccine Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Kenji Funami
- Department of Vaccine Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Hiroaki Shime
- Department of Vaccine Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Misako Matsumoto
- Department of Vaccine Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Tsukasa Seya
- Department of Vaccine Immunology, Hokkaido University Graduate School of Medicine, Sapporo, Japan
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12
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Shime H, Maruyama A, Yoshida S, Takeda Y, Matsumoto M, Seya T. Toll-like receptor 2 ligand and interferon-γ suppress anti-tumor T cell responses by enhancing the immunosuppressive activity of monocytic myeloid-derived suppressor cells. Oncoimmunology 2017; 7:e1373231. [PMID: 29296526 PMCID: PMC5739553 DOI: 10.1080/2162402x.2017.1373231] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 08/03/2017] [Accepted: 08/25/2017] [Indexed: 12/19/2022] Open
Abstract
CD11b+Gr1+ myeloid-derived suppressor cells (MDSCs) suppress activation/proliferation of cytotoxic T cells, thereby hindering cancer immunotherapy. MDSCs are increased after adjuvant therapy with toll-like receptor (TLR) 2 ligands, such as Pam2CSK4, in tumor-bearing mice. However, it remains unknown if the activation of TLR2 in MDSCs affects their function and the therapeutic efficacy of TLR2 ligand. Here, we show that TLR2 signaling in CD11b+Ly6G−Ly6Chigh monocytic MDSCs (M-MDSCs), but not CD11b+Ly6G+Ly6Clow granulocytic MDSCs (G-MDSCs), enhances their immunosuppressive activity, thereby limiting anti-tumor T cell responses induced by TLR2-activated dendritic cells (DCs). iNOS induction was critical for Pam2CSK4-enhanced T cell suppression by M-MDSCs. iNOS was expressed in M-MDSC-derived macrophages, but not undifferentiated M-MDSCs, in cocultures with CD8+ T cells, CD11c+ DCs, antigen peptide and Pam2CSK4. Pam2CSK4 increased the differentiation frequency of M-MDSCs to macrophages, and iNOS expression required interferon-γ (IFN-γ) production by CD8+ T cells that had been transiently stimulated by M-MDSC-derived macrophages in an antigen/TLR2-dependent manner. Although Pam2CSK4 triggered DC maturation and tumor regression via induction of tumor antigen-specific cytotoxic T lymphocyte (CTL) responses in tumor-bearing mice, Pam2CSK4 plus antigen increased the frequency of iNOS+ macrophages in the tumor. Treatment with iNOS inhibitor enhanced the therapeutic efficacy of Pam2CSK4. Hence, the results suggest that TLR2 ligand and T cell-derived IFN-γ enhance M-MDSC-mediated immunosuppression, which may negatively regulate anti-tumor CTL response.
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Affiliation(s)
- Hiroaki Shime
- Department of Microbiology and Immunology, Graduate School of Medicine, Hokkaido University, Kita 15 Nishi 7, Kita-ku, Sapporo, Japan.,Department of Immunology, Graduate School of Medical Sciences, Nagoya City University, 1-Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Japan
| | - Akira Maruyama
- Department of Microbiology and Immunology, Graduate School of Medicine, Hokkaido University, Kita 15 Nishi 7, Kita-ku, Sapporo, Japan
| | - Sumito Yoshida
- Department of Microbiology and Immunology, Graduate School of Medicine, Hokkaido University, Kita 15 Nishi 7, Kita-ku, Sapporo, Japan
| | - Yohei Takeda
- Department of Microbiology and Immunology, Graduate School of Medicine, Hokkaido University, Kita 15 Nishi 7, Kita-ku, Sapporo, Japan
| | - Misako Matsumoto
- Department of Microbiology and Immunology, Graduate School of Medicine, Hokkaido University, Kita 15 Nishi 7, Kita-ku, Sapporo, Japan
| | - Tsukasa Seya
- Department of Microbiology and Immunology, Graduate School of Medicine, Hokkaido University, Kita 15 Nishi 7, Kita-ku, Sapporo, Japan
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Takeda Y, Azuma M, Matsumoto M, Seya T. Tumoricidal efficacy coincides with CD11c up-regulation in antigen-specific CD8(+) T cells during vaccine immunotherapy. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2016; 35:143. [PMID: 27619885 PMCID: PMC5020536 DOI: 10.1186/s13046-016-0416-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 09/01/2016] [Indexed: 01/07/2023]
Abstract
Background Dendritic cells (DCs) mount tumor-associated antigens (TAAs), and the double-stranded RNA adjuvant Poly(I:C) stimulates Toll-like receptor 3 (TLR3) signal in DC, which in turn induces type I interferon (IFN) and interleukin-12 (IL-12), then cross-primes cytotoxic T lymphocytes (CTLs). Proliferation of CTLs correlates with tumor regression. How these potent cells expand with high quality is crucial to the outcome of CTL therapy. However, good markers reflecting the efficacy of DC-target immunotherapy have not been addressed. Methods Using an EG7 (ovalbumin, OVA-positive) tumor-implant mouse model, we examined what is a good marker for active CTL induction in treatment with Poly(I:C)/OVA. Results Simultaneous administration of Poly(I:C) and antigen (Ag) OVA significantly increased a minor population of CD8+ T cells, that express CD11c in lymphoid and tumor sites. The numbers of the CD11c+ CD8+ T cells correlated with those of induced Ag-specific CD8+ T cells and tumor regression. The CD11c+ CD8+ T cell moiety was characterized by its high killing activity and IFN-γ-producing ability, which represent an active phenotype of the effector CTLs. Not only a TLR3-specific (TICAM-1-dependent) signal but also TLR2 (MyD88) signal in DC triggered the expansion of CD11c+ CD8+ T cells in tumor-bearing mice. Notably, human CD11c+ CD8+ T cells also proliferated in peripheral blood mononuclear cells (PBMC) stimulated with cytomegalovirus (CMV) Ag. Conclusions CD11c expression in CD8+ T cells reflects anti-tumor CTL activity and would be a marker for immunotherapeutic efficacy in mouse models and probably cancer patients as well. Electronic supplementary material The online version of this article (doi:10.1186/s13046-016-0416-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yohei Takeda
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita 15, Nishi 7, Kita-ku, Sapporo, 060-8638, Japan
| | - Masahiro Azuma
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita 15, Nishi 7, Kita-ku, Sapporo, 060-8638, Japan
| | - Misako Matsumoto
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita 15, Nishi 7, Kita-ku, Sapporo, 060-8638, Japan
| | - Tsukasa Seya
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita 15, Nishi 7, Kita-ku, Sapporo, 060-8638, Japan.
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Heidegger S, Jarosch A, Schmickl M, Endres S, Bourquin C, Hotz C. Mycoplasma hyorhinis-Contaminated Cell Lines Activate Primary Innate Immune Cells via a Protease-Sensitive Factor. PLoS One 2015; 10:e0142523. [PMID: 26565413 PMCID: PMC4643973 DOI: 10.1371/journal.pone.0142523] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 10/22/2015] [Indexed: 02/06/2023] Open
Abstract
Mycoplasma are a frequent and occult contaminant of cell cultures, whereby these prokaryotic organisms can modify many aspects of cell physiology, rendering experiments that are conducted with such contaminated cells problematic. Chronic Mycoplasma contamination in human monocytic cells lines has been associated with suppressed Toll-like receptor (TLR) function. In contrast, we show here that components derived from a Mycoplasma hyorhinis-infected cell line can activate innate immunity in non-infected primary immune cells. Release of pro-inflammatory cytokines such as IL-6 by dendritic cells in response to Mycoplasma hyorhinis-infected cell components was critically dependent on the adapter protein MyD88 but only partially on TLR2. Unlike canonical TLR2 signaling that is triggered in response to the detection of Mycoplasma infection, innate immune activation by components of Mycoplasma-infected cells was inhibited by chloroquine treatment and sensitive to protease treatment. We further show that in plasmacytoid dendritic cells, soluble factors from Mycoplasma hyorhinis-infected cells induce the production of large amounts of IFN-α. We conclude that Mycoplasma hyorhinis-infected cell lines release protein factors that can potently activate co-cultured innate immune cells via a previously unrecognized mechanism, thus limiting the validity of such co-culture experiments.
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Affiliation(s)
- Simon Heidegger
- Center for Integrated Protein Science Munich (CIPSM), Division of Clinical Pharmacology, Medizinische Klinik und Poliklinik IV, Ludwig-Maximilians-Universität München, 80336 Munich, Germany
- III. Medizinische Klinik, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Alexander Jarosch
- Center for Integrated Protein Science Munich (CIPSM), Division of Clinical Pharmacology, Medizinische Klinik und Poliklinik IV, Ludwig-Maximilians-Universität München, 80336 Munich, Germany
| | - Martina Schmickl
- III. Medizinische Klinik, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Stefan Endres
- Center for Integrated Protein Science Munich (CIPSM), Division of Clinical Pharmacology, Medizinische Klinik und Poliklinik IV, Ludwig-Maximilians-Universität München, 80336 Munich, Germany
| | - Carole Bourquin
- Center for Integrated Protein Science Munich (CIPSM), Division of Clinical Pharmacology, Medizinische Klinik und Poliklinik IV, Ludwig-Maximilians-Universität München, 80336 Munich, Germany
- Chair of Pharmacology, Department of Medicine, Faculty of Science, University of Fribourg, 1700 Fribourg, Switzerland
- * E-mail:
| | - Christian Hotz
- Center for Integrated Protein Science Munich (CIPSM), Division of Clinical Pharmacology, Medizinische Klinik und Poliklinik IV, Ludwig-Maximilians-Universität München, 80336 Munich, Germany
- Chair of Pharmacology, Department of Medicine, Faculty of Science, University of Fribourg, 1700 Fribourg, Switzerland
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Müller C, Tufa DM, Chatterjee D, Mühlradt PF, Schmidt RE, Jacobs R. The TLR-2/TLR-6 agonist macrophage-activating lipopeptide-2 augments human NK cell cytotoxicity when PGE2 production by monocytes is inhibited by a COX-2 blocker. Cancer Immunol Immunother 2015; 64:1175-84. [PMID: 26036909 PMCID: PMC11028474 DOI: 10.1007/s00262-015-1723-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Accepted: 05/24/2015] [Indexed: 12/29/2022]
Abstract
Macrophage-activating lipopeptide-2 (MALP-2) is a potent inducer of proinflammatory cytokine secretion by macrophages, monocytes, and dendritic cells. MALP-2 was reported to be involved in natural killer (NK) cell activation and ensuing tumor rejection. However, the mechanism of MALP-2-mediated NK cell activation remained unclear. Therefore, we studied the effects of MALP-2 on cultured human NK cells. We found that MALP-2 had no direct effect on NK cells. Instead, MALP-2 acted on monocytes and triggered the release of different molecules such as interleukin (IL)-1β, IL-6, IL-10, IL-12, IL-15, interferon gamma-induced protein (IP-10), and prostaglandin (PG)-E2. Our data show that monocyte-derived IP-10 could significantly induce NK cell cytotoxicity as long as the immunosuppression by PGE2 is specifically inhibited by cyclooxygenase (COX)-2 blockade. In summary, our results show that MALP-2-mediated stimulation of monocytes results in the production of several mediators which, depending on the prevailing conditions, affect the activity of NK cells in various ways. Hence, MALP-2 administration with concurrent blocking of COX-2 can be considered as a promising approach in MALP-2-based adjuvant tumor therapies.
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Affiliation(s)
- Christina Müller
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Dejene M. Tufa
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Debanjana Chatterjee
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | | | - Reinhold E. Schmidt
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - Roland Jacobs
- Department of Clinical Immunology and Rheumatology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
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Maruyama A, Shime H, Takeda Y, Azuma M, Matsumoto M, Seya T. Pam2 lipopeptides systemically increase myeloid-derived suppressor cells through TLR2 signaling. Biochem Biophys Res Commun 2015; 457:445-50. [DOI: 10.1016/j.bbrc.2015.01.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Accepted: 01/06/2015] [Indexed: 12/26/2022]
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Hernandez JC, Giraldo DM, Paul S, Urcuqui-Inchima S. Involvement of neutrophil hyporesponse and the role of Toll-like receptors in human immunodeficiency virus 1 protection. PLoS One 2015; 10:e0119844. [PMID: 25785697 PMCID: PMC4364960 DOI: 10.1371/journal.pone.0119844] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Accepted: 01/16/2015] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVES Neutrophils contribute to pathogen clearance through pattern recognition receptors (PRRs) activation. However, the role of PRRs in neutrophils in both HIV-1-infected [HIV-1(+)] and HIV-1-exposed seronegative individuals (HESN) is unknown. Here, a study was carried out to evaluate the level of PRR mRNAs and cytokines produced after activation of neutrophils from HIV-1(+), HESN and healthy donors. METHODS The neutrophils were stimulated with specific agonists for TLR2, TLR4 and TLR9 in the presence of HIV-1 particles. Pro-inflammatory cytokine production, expression of neutrophil activation markers and reactive oxygen species (ROS) production were analyzed in neutrophils from HESN, HIV-1(+) and healthy donors (controls). RESULTS We found that neutrophils from HESN presented reduced expression of PRR mRNAs (TLR4, TLR9, NOD1, NOD2, NLRC4 and RIG-I) and reduced expression of cytokine mRNAs (IL-1β, IL-6, IL-18, TNF-α and TGF-β). Moreover, neutrophils from HESN were less sensitive to stimulation through TLR4. Furthermore, neutrophils from HESN challenged with HIV-1 and stimulated with TLR2 and TLR4 agonists, produced significantly lower levels of reactive oxygen species, versus HIV-1(+). CONCLUSIONS A differential pattern of PRR expression and release of innate immune factors in neutrophils from HESN is evident. Our results suggest that lower neutrophil activation can be involved in protection against HIV-1 infection.
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Affiliation(s)
- Juan C. Hernandez
- INFETTARE, Facultad de Medicina, Universidad Cooperativa de Colombia, Medellin, Colombia
| | - Diana M. Giraldo
- Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
| | - Stephane Paul
- GIMAP EA3064, Faculté de Medicine de Saint Etienne, Université de Lyon, Lyon, France
| | - Silvio Urcuqui-Inchima
- Grupo Inmunovirología, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
- * E-mail:
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Kasamatsu J, Takahashi S, Azuma M, Matsumoto M, Morii-Sakai A, Imamura M, Teshima T, Takahashi A, Hirohashi Y, Torigoe T, Sato N, Seya T. PolyI:C and mouse survivin artificially embedding human 2B peptide induce a CD4+ T cell response to autologous survivin in HLA-A*2402 transgenic mice. Immunobiology 2014; 220:74-82. [PMID: 25257859 DOI: 10.1016/j.imbio.2014.08.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 08/04/2014] [Accepted: 08/06/2014] [Indexed: 11/29/2022]
Abstract
CD4(+) T cell effectors are crucial for establishing antitumor immunity. Dendritic cell maturation by immune adjuvants appears to facilitate subset-specific CD4(+) T cell proliferation, but the adjuvant effect for CD4 T on induction of cytotoxic T lymphocytes (CTLs) is largely unknown. Self-antigenic determinants with low avidity are usually CD4 epitopes in mutated proteins with tumor-associated class I-antigens (TAAs). In this study, we made a chimeric version of survivin, a target of human CTLs. The chimeric survivin, where human survivin-2B containing a TAA was embedded in the mouse survivin frame (MmSVN2B), was used to immunize HLA-A-2402/K(b)-transgenic (HLA24(b)-Tg) mice. Subcutaneous administration of MmSVN2B or xenogeneic human survivin (control HsSNV2B) to HLA24(b)-Tg mice failed to induce an immune response without co-administration of an RNA adjuvant polyI:C, which was required for effector induction in vivo. Although HLA-A-2402/K(b) presented the survivin-2B peptide in C57BL/6 mice, 2B-specific tetramer assays showed that no CD8(+) T CTLs specific to survivin-2B proliferated above the detection limit in immunized mice, even with polyI:C treatment. However, the CD4(+) T cell response, as monitored by IFN-γ, was significantly increased in mice given polyI:C+MmSVN2B. The Th1 response and antibody production were enhanced in the mice with polyI:C. The CD4 epitope responsible for effector function was not Hs/MmSNV13-27, a nonconserved region between human and mouse survivin, but region 53-67, which was identical between human and mouse survivin. These results suggest that activated, self-reactive CD4(+) helper T cells proliferate in MmSVN2B+polyI:C immunization and contribute to Th1 polarization followed by antibody production, but hardly participate in CTL induction.
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Affiliation(s)
- Jun Kasamatsu
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo, Japan
| | - Shojiro Takahashi
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo, Japan; Department of Hematology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo, Japan
| | - Masahiro Azuma
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo, Japan
| | - Misako Matsumoto
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo, Japan
| | - Akiko Morii-Sakai
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo, Japan
| | - Masahiro Imamura
- Department of Hematology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo, Japan
| | - Takanori Teshima
- Department of Hematology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo, Japan
| | - Akari Takahashi
- Department of Pathology, Sapporo Medical University School of Medicine, Chuoh-ku, Sapporo, Japan
| | - Yoshihiko Hirohashi
- Department of Pathology, Sapporo Medical University School of Medicine, Chuoh-ku, Sapporo, Japan
| | - Toshihiko Torigoe
- Department of Pathology, Sapporo Medical University School of Medicine, Chuoh-ku, Sapporo, Japan
| | - Noriyuki Sato
- Department of Pathology, Sapporo Medical University School of Medicine, Chuoh-ku, Sapporo, Japan
| | - Tsukasa Seya
- Department of Microbiology and Immunology, Hokkaido University Graduate School of Medicine, Kita-ku, Sapporo, Japan.
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Targeting TLR2 for vaccine development. J Immunol Res 2014; 2014:619410. [PMID: 25057505 PMCID: PMC4098989 DOI: 10.1155/2014/619410] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/16/2014] [Accepted: 06/04/2014] [Indexed: 02/07/2023] Open
Abstract
Novel and more effective immunization strategies against many animal diseases may profit from the current knowledge on the modulation of specific immunity through stimulation of innate immune receptors. Toll-like receptor (TLR)2-targeting formulations, such as synthetic lipopeptides and antigens expressed in fusion with lipoproteins, have been shown to have built-in adjuvant properties and to be effective at inducing cellular and humoral immune mechanisms in different animal species. However, contradictory data has arisen concerning the profile of the immune response elicited. The benefits of targeting TLR2 for vaccine development are thus still debatable and more studies are needed to rationally explore its characteristics. Here, we resume the main features of TLR2 and TLR2-induced immune responses, focusing on what has been reported for veterinary animals.
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Akazawa T, Ohashi T, Nakajima H, Nishizawa Y, Kodama K, Sugiura K, Inaba T, Inoue N. Development of a dendritic cell-targeting lipopeptide as an immunoadjuvant that inhibits tumor growth without inducing local inflammation. Int J Cancer 2014; 135:2847-56. [PMID: 24789268 DOI: 10.1002/ijc.28939] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Accepted: 04/15/2014] [Indexed: 01/30/2023]
Abstract
Materials used for the past 30 years as immunoadjuvants induce suboptimal antitumor immune responses and often cause undesirable local inflammation. Some bacterial lipopeptides that act as Toll-like receptor (TLR) 2 ligands activate immune cells as immunoadjuvants and induce antitumor effects. Here, we developed a new dendritic cell (DC)-targeting lipopeptide, h11c (P2C-ATPEDNGRSFS), which uses the CD11c-binding sequence of intracellular adhesion molecule-1 to selectively and efficiently activate DCs but not other immune cells. Although the h11c lipopeptide activated DCs similarly to an artificial lipopeptide, P2C-SKKKK (P2CSK4), via TLR2 in vitro, h11c induced more effective tumor inhibition than P2CSK4 at low doses in vivo with tumor antigens. Even without tumor antigens, h11c lipopeptide significantly inhibited tumor growth and induced tumor-specific cytotoxic T cells. P2CSK4 was retained subcutaneously at the vaccination site and induced severe local inflammation in in vivo experiments. In contrast, h11c was not retained at the vaccination site and was transported into the tumor within 24 hr. The recruitment of DCs into the tumor was induced by h11c more effectively, while P2CSK4 induced the accumulation of neutrophils leading to severe inflammation at the vaccination site. Because CD11b+ cells, but not CD11c+ cells, produced neutrophil chemotactic factors such as macrophage inflammatory protein (MIP)-2 in response to stimulation with TLR2 ligands, the DC-targeting lipopeptide h11c induced less MIP-2 production by splenocytes than P2CSK4. In this study, we succeeded in developing a novel immunoadjuvant, h11c, which effectively induces antitumor activity without adverse effects such as local inflammation via the selective activation of DCs.
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Affiliation(s)
- Takashi Akazawa
- Department of Molecular Genetics, Osaka Medical Center for Cancer and Cardiovascular Diseases, Higashinari-ku, Osaka, Japan
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van Bergenhenegouwen J, Plantinga TS, Joosten LAB, Netea MG, Folkerts G, Kraneveld AD, Garssen J, Vos AP. TLR2 & Co: a critical analysis of the complex interactions between TLR2 and coreceptors. J Leukoc Biol 2013; 94:885-902. [PMID: 23990624 DOI: 10.1189/jlb.0113003] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
TLRs play a major role in microbe-host interactions and innate immunity. Of the 10 functional TLRs described in humans, TLR2 is unique in its requirement to form heterodimers with TLR1 or TLR6 for the initiation of signaling and cellular activation. The ligand specificity of TLR2 heterodimers has been studied extensively, using specific bacterial and synthetic lipoproteins to gain insight into the structure-function relationship, the minimal active motifs, and the critical dependence on TLR1 or TLR6 for activation. Different from that for specific well-defined TLR2 agonists, recognition of more complex ligands like intact microbes or molecules from endogenous origin requires TLR2 to interact with additional coreceptors. A breadth of data has been published on ligand-induced interactions of TLR2 with additional pattern recognition receptors such as CD14, scavenger receptors, integrins, and a range of other receptors, all of them important factors in TLR2 function. This review summarizes the roles of TLR2 in vivo and in specific immune cell types and integrates this information with a detailed review of our current understanding of the roles of specific coreceptors and ligands in regulating TLR2 functions. Understanding how these processes affect intracellular signaling and drive functional immune responses will lead to a better understanding of host-microbe interactions and will aid in the design of new agents to target TLR2 function in health and disease.
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Grote K, Sonnenschein K, Kapopara PR, Hillmer A, Grothusen C, Salguero G, Kotlarz D, Schuett H, Bavendiek U, Schieffer B. Toll-like receptor 2/6 agonist macrophage-activating lipopeptide-2 promotes reendothelialization and inhibits neointima formation after vascular injury. Arterioscler Thromb Vasc Biol 2013; 33:2097-104. [PMID: 23868938 DOI: 10.1161/atvbaha.113.301799] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
OBJECTIVE Reendothelialization after vascular injury (ie, balloon angioplasty or stent implantation) is clinically extremely relevant to promote vascular healing. We here investigated the therapeutic potential of the toll-like receptor 2/6 agonist macrophage-activating lipopeptide (MALP)-2 on reendothelialization and neointima formation in a murine model of vascular injury. APPROACH AND RESULTS The left common carotid artery was electrically injured, and reendothelialization was quantified by Evans blue staining after 3 days. A single injection of MALP-2 (1 or 10 µg, IV) after vascular injury accelerated reendothelialization (P<0.001). Proliferation of endothelial cells at the wound margins determined by 5-ethynyl-2'-deoxyuridine incorporation was significantly higher in MALP-2-treated animals (P<0.05). Furthermore, wire injury-induced neointima formation of the left common carotid artery was completely prevented by a single injection of MALP-2 (10 µg, IV). In vitro, MALP-2 induced proliferation (BrdU incorporation) and closure of an artificial wound of endothelial cells (P<0.05) but not of smooth muscle cells. Protein array and ELISA analysis of isolated primary endothelial cells and ex vivo stimulated carotid segments revealed that MALP-2 stimulated the release of multiple growth factors and cytokines predominantly from endothelial cells. MALP-2 induced a strong activation of the mitogen-activated protein kinase cascade in endothelial cells, which was attenuated in smooth muscle cells. Furthermore, MALP-2 significantly enhanced circulating monocytes and hematopoietic progenitor cells. CONCLUSIONS The toll-like receptor 2/6 agonist MALP-2 promotes reendothelialization and inhibits neointima formation after experimental vascular injury via enhanced proliferation and migration of endothelial cells. Thus, MALP-2 represents a novel therapeutic option to accelerate reendothelialization after vascular injury.
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Affiliation(s)
- Karsten Grote
- Department of Cardiology and Angiology, Hannover Medical School, Hannover, Germany.
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Pinto A, Morello S, Sorrentino R. Lung cancer and Toll-like receptors. Cancer Immunol Immunother 2011; 60:1211-20. [PMID: 21789594 PMCID: PMC11029286 DOI: 10.1007/s00262-011-1057-8] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Accepted: 05/28/2011] [Indexed: 01/11/2023]
Abstract
Lung carcinoma is one of the leading causes of death worldwide. It is a non-immunogenic cancer, resistant to immune surveillance. Toll-like receptors (TLRs) connect the innate to the adaptive immune system. Given that cancerous cells evade the immune system, the activation of TLRs could represent a potential target for cancer therapy. The induction of Th1-like and cytotoxic immunity by TLR signalling could lead to tumour cell death, resulting in tumour regression or arrest. However, basic research and clinical trials revealed that the activation of specific TLRs, such as TLR2, TLR4 and TLR9, do not have any anti-tumour activity in lung carcinoma. Increasing evidence suggests that TLRs are important regulators of tumour biology; however, little is known about their function in lung cancer. Thus, in order to develop new therapeutic approaches, further studies are needed to understand the connection between TLRs and lung cancer progression. This review focuses on the potential mechanisms by which TLR ligands can facilitate or not lung cancer and lung metastases establishment/progression.
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Affiliation(s)
- Aldo Pinto
- Pharmaceutical and Biomedical Sciences Department (FARMABIOMED), University of Salerno, 84084 Fisciano, Salerno Italy
| | - Silvana Morello
- Pharmaceutical and Biomedical Sciences Department (FARMABIOMED), University of Salerno, 84084 Fisciano, Salerno Italy
| | - Rosalinda Sorrentino
- Pharmaceutical and Biomedical Sciences Department (FARMABIOMED), University of Salerno, 84084 Fisciano, Salerno Italy
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