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Malaria modifies neonatal and early-life toll-like receptor cytokine responses. Infect Immun 2013; 81:2686-96. [PMID: 23690399 DOI: 10.1128/iai.00237-13] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Protection from infections in early life relies extensively on innate immunity, but it is unknown whether and how maternal infections modulate infants' innate immune responses, thereby altering susceptibility to infections. Plasmodium falciparum causes pregnancy-associated malaria (PAM), and epidemiological studies have shown that PAM enhances infants' susceptibility to infection with P. falciparum. We investigated how PAM-mediated exposures in utero affect innate immune responses and their relationship with infection in infancy. In a prospective study of mothers and their babies in Benin, we investigated changes in Toll-like receptor (TLR)-mediated cytokine responses related to P. falciparum infections. Whole-blood samples from 134 infants at birth and at 3, 6, and 12 months of age were stimulated with agonists specific for TLR3, TLR4, TLR7/8, and TLR9. TLR-mediated interleukin 6 (IL-6) and IL-10 production was robust at birth and then stabilized, whereas tumor necrosis factor alpha (TNF-α) and gamma interferon (IFN-γ) responses were weak at birth and then increased. In multivariate analyses, maternal P. falciparum infections at delivery were associated with significantly higher TLR3-mediated IL-6 and IL-10 responses in the first 3 months of life (P < 0.05) and with significantly higher TLR3-, TLR7/8-, and TLR9-mediated TNF-α responses between 6 and 12 months of age (P < 0.05). Prospective analyses showed that higher TLR3- and TLR7/8-mediated IL-10 responses at birth were associated with a significantly higher risk of P. falciparum infection in infancy (P < 0.05). Neonatal and infant intracellular TLR-mediated cytokine responses are conditioned by in utero exposure through PAM late in pregnancy. Enhanced TLR-mediated IL-10 responses at birth are associated with an increased risk of P. falciparum infection, suggesting a compromised ability to combat infection in early life.
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152
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Llanos C, Mackern-Oberti JP, Vega F, Jacobelli SH, Kalergis AM. Tolerogenic dendritic cells as a therapy for treating lupus. Clin Immunol 2013; 148:237-45. [PMID: 23773922 DOI: 10.1016/j.clim.2013.04.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/03/2013] [Accepted: 04/29/2013] [Indexed: 11/28/2022]
Abstract
Systemic lupus erythematosus (SLE) is a chronic autoimmune disorder that is characterized by the over production of auto-antibodies against nuclear components. Thus, SLE patients have increased morbidity and, mortality compared to healthy individuals. Available therapies are not curative and are associated with unwanted adverse effects. During the last few years, important advances in immunology research have provided rheumatologists with new tools for designing novel therapies for treating autoimmunity. However, the complex nature of SLE has played a conflicting role, hindering breakthroughs in therapeutic development. Nonetheless, new advances about SLE pathogenesis could open a fruitful line of research. Dendritic cells (DCs) have been established as essential players in the mechanisms underlying SLE, making them attractive therapeutic targets for fine-tuning the immune system. In this review, we discuss the recent advances made in revealing the mechanisms of SLE pathogenesis, with a focus on the use of DCs as a target for therapy development.
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Affiliation(s)
- Carolina Llanos
- Millennium Institute on Immunology and Immunotherapy, Departamento de Inmunología Clínica y Reumatología, Escuela de Medicina, Pontificia Universidad Católica de Chile, Chile.
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153
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Auray G, Facci MR, van Kessel J, Buchanan R, Babiuk LA, Gerdts V. Porcine neonatal blood dendritic cells, but not monocytes, are more responsive to TLRs stimulation than their adult counterparts. PLoS One 2013; 8:e59629. [PMID: 23667422 PMCID: PMC3648567 DOI: 10.1371/journal.pone.0059629] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 02/15/2013] [Indexed: 01/20/2023] Open
Abstract
The neonatal immune system is often considered as immature or impaired compared to the adult immune system. This higher susceptibility to infections is partly due to the skewing of the neonatal immune response towards a Th2 response. Activation and maturation of dendritic cells (DCs) play an important role in shaping the immune response, therefore, DCs are a target of choice for the development of efficient and protective vaccine formulations able to redirect the neonatal immune response to a protective Th1 response. As pigs are becoming more important for vaccine development studies due to their similarity to the human immune system, we decided to compare the activation and maturation of a subpopulation of porcine DCs in adult and neonatal pigs following stimulation with different TLR ligands, which are promising candidates for adjuvants in vaccine formulations. Porcine blood derived DCs (BDCs) were directly isolated from blood and consisted of a mix of conventional and plasmacytoid DCs. Following CpG ODN (TLR9 ligand) and imiquimod (TLR7 ligand) stimulation, neonatal BDCs showed higher levels of expression of costimulatory molecules and similar (CpG ODN) or higher (imiquimod) levels of IL-12 compared to adult BDCs. Another interesting feature was that only neonatal BDCs produced IFN-α after TLR7 or TLR9 ligand stimulation. Stimulation with CpG ODN and imiquimod also induced enhanced expression of several chemokines. Moreover, in a mixed leukocyte reaction assay, neonatal BDCs displayed a greater ability to induce lymphoproliferation. These findings suggest that when stimulated via TLR7 or TLR9 porcine DCs display similar if not better response than adult porcine DCs.
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Affiliation(s)
- Gael Auray
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Canada
- Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, Canada
| | - Marina R. Facci
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Canada
| | - Jill van Kessel
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Canada
| | - Rachelle Buchanan
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Canada
| | | | - Volker Gerdts
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Canada
- Department of Veterinary Microbiology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada
- * E-mail:
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154
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Laresgoiti-Servitje E. A leading role for the immune system in the pathophysiology of preeclampsia. J Leukoc Biol 2013; 94:247-57. [DOI: 10.1189/jlb.1112603] [Citation(s) in RCA: 205] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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155
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Stone AEL, Giugliano S, Schnell G, Cheng L, Leahy KF, Golden-Mason L, Gale M, Rosen HR. Hepatitis C virus pathogen associated molecular pattern (PAMP) triggers production of lambda-interferons by human plasmacytoid dendritic cells. PLoS Pathog 2013; 9:e1003316. [PMID: 23637605 PMCID: PMC3630164 DOI: 10.1371/journal.ppat.1003316] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Accepted: 03/05/2013] [Indexed: 01/23/2023] Open
Abstract
Plasmacytoid Dendritic Cells (pDCs) represent a key immune cell in the defense against viruses. Through pattern recognition receptors (PRRs), these cells detect viral pathogen associated molecular patterns (PAMPs) and initiate an Interferon (IFN) response. pDCs produce the antiviral IFNs including the well-studied Type I and the more recently described Type III. Recent genome wide association studies (GWAS) have implicated Type III IFNs in HCV clearance. We examined the IFN response induced in a pDC cell line and ex vivo human pDCs by a region of the HCV genome referred to as the HCV PAMP. This RNA has been shown previously to be immunogenic in hepatocytes, whereas the conserved X-region RNA is not. We show that in response to the HCV PAMP, pDC-GEN2.2 cells upregulate and secrete Type III (in addition to Type I) IFNs and upregulate PRR genes and proteins. We also demonstrate that the recognition of this RNA is dependent on RIG-I-like Receptors (RLRs) and Toll-like Receptors (TLRs), challenging the dogma that RLRs are dispensable in pDCs. The IFNs produced by these cells in response to the HCV PAMP also control HCV replication in vitro. These data are recapitulated in ex vivo pDCs isolated from healthy donors. Together, our data shows that pDCs respond robustly to HCV RNA to make Type III Interferons that control viral replication. This may represent a novel therapeutic strategy for the treatment of HCV.
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Affiliation(s)
- Amy E. L. Stone
- Integrated Department in Immunology: University of Colorado Denver and National Jewish Health, Denver, Colorado, United States of America
- Division of Gastroenterology & Hepatology, Hepatitis C Center, Department of Medicine, University of Colorado Denver, Aurora, Colorado, United States of America
| | - Silvia Giugliano
- Division of Gastroenterology & Hepatology, Hepatitis C Center, Department of Medicine, University of Colorado Denver, Aurora, Colorado, United States of America
| | - Gretja Schnell
- Department of Immunology, University of Washington, School of Medicine, Seattle, Washington, United States of America
| | - Linling Cheng
- Division of Gastroenterology & Hepatology, Hepatitis C Center, Department of Medicine, University of Colorado Denver, Aurora, Colorado, United States of America
| | - Katelyn F. Leahy
- Division of Gastroenterology & Hepatology, Hepatitis C Center, Department of Medicine, University of Colorado Denver, Aurora, Colorado, United States of America
| | - Lucy Golden-Mason
- Integrated Department in Immunology: University of Colorado Denver and National Jewish Health, Denver, Colorado, United States of America
- Division of Gastroenterology & Hepatology, Hepatitis C Center, Department of Medicine, University of Colorado Denver, Aurora, Colorado, United States of America
| | - Michael Gale
- Department of Immunology, University of Washington, School of Medicine, Seattle, Washington, United States of America
| | - Hugo R. Rosen
- Integrated Department in Immunology: University of Colorado Denver and National Jewish Health, Denver, Colorado, United States of America
- Division of Gastroenterology & Hepatology, Hepatitis C Center, Department of Medicine, University of Colorado Denver, Aurora, Colorado, United States of America
- Denver Veteran's Affairs Medical Center, Denver, Colorado, United States of America
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156
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Abstract
Avian influenza virus infections in the human population are rare due to their inefficient direct human-to-human transmission. However, when humans are infected, a strong inflammatory response is usually induced, characterized by elevated levels of cytokines and chemokines in serum, believed to be important in the severe pathogenesis that develops in a high proportion of these patients. Extensive research has been performed to understand the molecular viral mechanisms involved in the H5N1 pathogenesis in humans, providing interesting insights about the virus-host interaction and the regulation of the innate immune response by these highly pathogenic viruses. In this review we summarize and discuss the most important findings in this field, focusing mainly on H5N1 virulence factors and their impact on the modulation of the innate immunity in humans.
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Affiliation(s)
- Irene Ramos
- Authors to whom correspondence should be addressed; (A.F.S.); (I.R.); Tel. +1-212-241-5182 (A.F.S.); +1-212 241-0994 (I.R.); Fax: +1-212-534-1684 (A.F.S.); +1-212-534-1684 (I.R.)
| | - Ana Fernandez-Sesma
- Authors to whom correspondence should be addressed; (A.F.S.); (I.R.); Tel. +1-212-241-5182 (A.F.S.); +1-212 241-0994 (I.R.); Fax: +1-212-534-1684 (A.F.S.); +1-212-534-1684 (I.R.)
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157
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Chehadeh W, Alkhabbaz M. Differential TLR7-mediated expression of proinflammatory and antiviral cytokines in response to laboratory and clinical enterovirus strains. Virus Res 2013; 174:88-94. [PMID: 23523654 DOI: 10.1016/j.virusres.2013.03.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 03/03/2013] [Accepted: 03/05/2013] [Indexed: 11/25/2022]
Abstract
Enteroviruses (EVs) are single stranded RNA viruses associated with many serious diseases. The exact mechanism by which an EV is able to evade innate immunity and cause tissue damage still remain unknown. Toll-like receptor 7 (TLR7) mediates the activation of type I interferon genes and the development of inflammatory cytokine response. The main aim of the study was to explore the antiviral activity and the pattern of cytokine expression in human embryonic kidney cells (HEK-293 cells) expressing TLR7 protein following challenging with laboratory and clinical EV strains. The TLR7 open reading frame was cloned into the pcDNA3.1/nV5-DEST™ expression vector, followed by transfection into HEK-293 cells. TLR7- and mock-transfected cells were infected with laboratory and clinical strains of CVB1 and CVB5. The levels of cytokines (IL-6, IL-8, TNF-α, IFN-α and IFN-β) were measured by ELISA. The EV RNA concentrations were measured by real-time RT-PCR, and normalized against GAPDH RNA concentrations. The clinical EV strains were more effective activators of cytokines production in TLR7-transfected cells than the laboratory EV strains. The inhibition of EV replication in TLR7-transfected cells was correlated to the production of type I IFNs. The cytopathic effects observed in TLR7-transfected cells were correlated to the levels of IL-6 and TNF-α. The results suggest a clear segregation between laboratory and clinical EV strains on the basis of their cytokine induction ability, and a possible role of TLR7-induced proinflammatory cytokines in the pathogenesis of EV infection.
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Affiliation(s)
- Wassim Chehadeh
- Virology Unit, Department of Microbiology, Faculty of Medicine, Kuwait University, Safat 13310, Kuwait.
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158
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Toll-like receptors in systemic lupus erythematosus: potential targets for therapeutic intervention. Curr Allergy Asthma Rep 2013; 12:1-7. [PMID: 22086298 DOI: 10.1007/s11882-011-0234-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Toll-like receptors (TLRs) have attracted increased attention in recent years, not only for their role in sensing conserved microbial components, but also in the realm of autoimmunity. Although TLRs are most widely known for their capacity to detect conserved motifs of infectious agents, mounting evidence indicates that these innate receptors also promote autoimmune conditions by causing uncontrolled autoinflammation as a result of chronic recognition of self. In response to the need for modern approaches to treatment of autoimmune diseases, several groups have begun investigating ways to target TLRs as new therapeutic options for autoimmune conditions. Here we discuss recent data describing advances in TLRs as therapeutic targets for treatment of autoimmune diseases, with a focus on systemic lupus erythematosus.
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159
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Guéry L, Hugues S. Tolerogenic and activatory plasmacytoid dendritic cells in autoimmunity. Front Immunol 2013; 4:59. [PMID: 23508732 PMCID: PMC3589693 DOI: 10.3389/fimmu.2013.00059] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Accepted: 02/19/2013] [Indexed: 11/30/2022] Open
Abstract
Plasmacytoid dendritic cells (pDCs) are a particular subset of DCs that link innate and adaptive immunity. They are responsible for the substantial production of type 1 interferon (IFN-I) in response to viral RNA or DNA through activation of TLR7 and 9. Furthermore, pDCs present antigens (Ag) and induce naïve T cell differentiation. It has been demonstrated that pDCs can induce immunogenic T cell responses through differentiation of cytotoxic CD8+ T cells and effector CD4+ T cells. Conversely, pDCs exhibit strong tolerogenic functions by inducing CD8+ T cell deletion, CD4+ T cell anergy, and Treg differentiation. However, since IFN-I produced by pDCs efficiently activates and recruits conventional DCs, B cells, T cells, and NK cells, pDCs also indirectly affect the nature and the amplitude of adaptive immune responses. As a consequence, the precise role of Ag-presenting functions of pDCs in adaptive immunity has been difficult to dissect in vivo. Additionally, different experimental procedures led to conflicting results regarding the outcome of T cell responses induced by pDCs. During the development of autoimmunity, pDCs have been shown to play both immunogenic and tolerogenic functions depending on disease, disease progression, and the experimental conditions. In this review, we will discuss the relative contribution of innate and adaptive pDC functions in modulating T cell responses, particularly during the development of autoimmunity.
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Affiliation(s)
- Leslie Guéry
- Department of Pathology and Immunology, University of Geneva Medical School Geneva, Switzerland
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160
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Torres S, Hernández JC, Giraldo D, Arboleda M, Rojas M, Smit JM, Urcuqui-Inchima S. Differential expression of Toll-like receptors in dendritic cells of patients with dengue during early and late acute phases of the disease. PLoS Negl Trop Dis 2013; 7:e2060. [PMID: 23469297 PMCID: PMC3585035 DOI: 10.1371/journal.pntd.0002060] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Accepted: 01/01/2013] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Dengue hemorrhagic fever (DHF) is observed in individuals that have pre-existing heterotypic dengue antibodies and is associated with increased viral load and high levels of pro-inflammatory cytokines early in infection. Interestingly, a recent study showed that dengue virus infection in the presence of antibodies resulted in poor stimulation of Toll-like receptors (TLRs), thereby facilitating virus particle production, and also suggesting that TLRs may contribute to disease pathogenesis. METHODOLOGY/PRINCIPAL FINDINGS We evaluated the expression levels of TLR2, 3, 4 and 9 and the co-stimulatory molecules CD80 and CD86 by flow cytometry. This was evaluated in monocytes, in myeloid and plasmacytoid dendritic cells (mDCs and pDCs) from 30 dengue patients with different clinical outcomes and in 20 healthy controls. Increased expression of TLR3 and TLR9 in DCs of patients with dengue fever (DF) early in infection was detected. In DCs from patients with severe manifestations, poor stimulation of TLR3 and TLR9 was observed. In addition, we found a lower expression of TLR2 in patients with DF compared to DHF. Expression levels of TLR4 were not affected. Furthermore, the expression of CD80 and CD86 was altered in mDCs and CD86 in pDCs of severe dengue cases. We show that interferon alpha production decreased in the presence of dengue virus after stimulation of PBMCs with the TLR9 agonist (CpG A). This suggests that the virus can affect the interferon response through this signaling pathway. CONCLUSIONS/SIGNIFICANCE These results show that during dengue disease progression, the expression profile of TLRs changes depending on the severity of the disease. Changes in TLRs expression could play a central role in DC activation, thereby influencing the innate immune response.
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Affiliation(s)
- Silvia Torres
- Grupo Inmunovirología, Sede de Investigación Universitaria, Universidad de Antioquia, Medellín, Colombia
- Department of Medical Microbiology, Molecular Virology Section, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Juan Carlos Hernández
- Grupo Inmunovirología, Sede de Investigación Universitaria, Universidad de Antioquia, Medellín, Colombia
- Grupo Infettare, Facultad de Medicina, Universidad Cooperativa de Colombia, Medellín, Colombia
| | - Diana Giraldo
- Grupo Inmunovirología, Sede de Investigación Universitaria, Universidad de Antioquia, Medellín, Colombia
| | - Margarita Arboleda
- Instituto Colombiano de Medicina Tropical, Universidad CES, Sabaneta, Antioquia, Colombia
| | - Mauricio Rojas
- Grupo de Inmunología Celular e Inmunogenética, Instituto de Investigaciones Médicas, Facultad de Medicina, Universidad de Antioquia, Medellín, Colombia
| | - Jolanda M. Smit
- Department of Medical Microbiology, Molecular Virology Section, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Silvio Urcuqui-Inchima
- Grupo Inmunovirología, Sede de Investigación Universitaria, Universidad de Antioquia, Medellín, Colombia
- * E-mail:
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161
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Nakamura T, Wada H, Kurebayashi H, McInally T, Bonnert R, Isobe Y. Synthesis and evaluation of 8-oxoadenine derivatives as potent Toll-like receptor 7 agonists with high water solubility. Bioorg Med Chem Lett 2013; 23:669-72. [DOI: 10.1016/j.bmcl.2012.11.114] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Accepted: 11/27/2012] [Indexed: 10/27/2022]
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162
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Giunti D, Parodi B, Usai C, Vergani L, Casazza S, Bruzzone S, Mancardi G, Uccelli A. Mesenchymal stem cells shape microglia effector functions through the release of CX3CL1. Stem Cells 2013; 30:2044-53. [PMID: 22821677 DOI: 10.1002/stem.1174] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Mesenchymal stem cells (MSC) display a remarkable ability to modulate the immune response and protect the central nervous system mainly through the release of soluble factors in a paracrine fashion, affecting the functional behavior of cells in the tissues. Here we investigated the effect of the interaction between MSC and microglia in vitro, and we dissected the molecular and cellular mechanisms of this crosstalk. We demonstrated that MSC impair microglia activation by inflammatory cues through the inhibition of the expression and release of inflammatory molecules and stress-associated proteins. We showed that MSC significantly increase microglial expression and release of molecules associated with a neuroprotective phenotype such as CX3CR1, nuclear receptor 4 family, CD200 receptor, and insulin growth factor 1. Interestingly, MSC can enhance functional changes on microglia as depicted by the increase of intracellular calcium concentration and phagocytic activity. This last event is associated with an increased expression of triggering receptor expressed on myeloid cells-2, an innate immune receptor involved in phagocytosis in the absence of inflammation. The observed effects on CX3CR1-expressing microglia are due to the release of CX3CL1 by MSC, driven by inflammatory signals, as demonstrated by the reversal of the observed results when CX3CL1 expression was silenced in MSC or its release was blocked. Finally, we showed that exogenous CX3CL1 induce phenotypic and functional changes of microglia similar to those induced by MSC. These findings demonstrate that MSC instruct, through the release of CX3CL1, microglia responsiveness to proinflammatory signals by modulating constitutive "calming" receptors, typically expressed by "steady-state microglia" thus switching microglia from a detrimental phenotype to a neuroprotective one.
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Affiliation(s)
- Debora Giunti
- Department of Neurosciences, Ophthalmology and Genetics, University of Genoa, Genoa, Italy
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163
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Human plasmacytoid dendritic cells efficiently cross-present exogenous Ags to CD8+ T cells despite lower Ag uptake than myeloid dendritic cell subsets. Blood 2013; 121:459-67. [DOI: 10.1182/blood-2012-06-435644] [Citation(s) in RCA: 128] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Abstract
In human peripheral blood, 4 populations of dendritic cells (DCs) can be distinguished, plasmacytoid dendritic cells (pDCs) and CD16+, CD1c+, and BDCA-3+ myeloid DCs (mDCs), each with distinct functional characteristics. DCs have the unique capacity to cross-present exogenously encountered antigens (Ags) to CD8+ T cells. Here we studied the ability of all 4 blood DC subsets to take up, process, and present tumor Ags to T cells. Although pDCs take up less Ags than CD1c+ and BDCA3+ mDCs, pDCs induce potent Ag-specific CD4+ and CD8+ T-cell responses. We show that pDCs can preserve Ags for prolonged periods of time and on stimulation show strong induction of both MHC class I and II, which explains their efficient activation of both CD4+ and CD8+ T cells. Furthermore, pDCs cross-present soluble and cell-associated tumor Ags to cytotoxic T lymphocytes equally well as BDCA3+ mDCs. These findings, and the fact that pDCs outnumber BDCA3+ mDCs, both in peripheral blood and lymph nodes, together with their potent IFN-I production, known to activate both components of the innate and adaptive immune system, put human pDCs forward as potent activators of CD8+ T cells in antitumor responses. Our findings may therefore have important consequences for the development of antitumor immunotherapy.
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164
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Buffa V, Klein K, Fischetti L, Shattock RJ. Evaluation of TLR agonists as potential mucosal adjuvants for HIV gp140 and tetanus toxoid in mice. PLoS One 2012; 7:e50529. [PMID: 23272062 PMCID: PMC3521731 DOI: 10.1371/journal.pone.0050529] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 10/23/2012] [Indexed: 11/19/2022] Open
Abstract
In the present study we investigate the impact of a range of TLR ligands and chitosan as potential adjuvants for different routes of mucosal immunisation (sublingual (SL), intranasal (IN), intravaginal (IVag) and a parenteral route (subcutaneous (SC)) in the murine model. We assess their ability to enhance antibody responses to HIV-1 CN54gp140 (gp140) and Tetanus toxoid (TT) in systemic and vaginal compartments. A number of trends were observed by route of administration. For non-adjuvanted antigen, SC>SL>IN immunisation with respect to systemic IgG responses, where endpoint titres were greater for TT than for gp140. In general, co-administration with adjuvants increased specific IgG responses where IN = SC>SL, while in the vaginal compartment IN>SL>SC for specific IgA. In contrast, for systemic and mucosal IgA responses to antigen alone SL>IN = SC. A number of adjuvants increased specific systemic IgA responses where in general IN>SL>SC immunisation, while for mucosal responses IN = SL>SC. In contrast, direct intravaginal immunisation failed to induce any detectable systemic or mucosal responses to gp140 even in the presence of adjuvant. However, significant systemic IgG responses to TT were induced by intravaginal immunisation with or without adjuvant, and detectable mucosal responses IgG and IgA were observed when TT was administered with FSL-1 or Poly I∶C. Interestingly some TLRs displayed differential activity dependent upon the route of administration. MPLA (TLR4) suppressed systemic responses to SL immunisation while enhancing responses to IN or SC immunisation. CpG B enhanced SL and IN responses, while having little or no impact on SC immunisation. These data demonstrate important route, antigen and adjuvant effects that need to be considered in the design of mucosal vaccine strategies.
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Affiliation(s)
- Viviana Buffa
- Clinical Sciences, St. George's University of London, London, United Kingdom
| | - Katja Klein
- Clinical Sciences, St. George's University of London, London, United Kingdom
| | - Lucia Fischetti
- Clinical Sciences, St. George's University of London, London, United Kingdom
| | - Robin J. Shattock
- Clinical Sciences, St. George's University of London, London, United Kingdom
- * E-mail:
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165
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Characteristics of plasmacytoid dendritic cell and CD4+ T cell in HIV elite controllers. Clin Dev Immunol 2012; 2012:869505. [PMID: 23243424 PMCID: PMC3517220 DOI: 10.1155/2012/869505] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2012] [Revised: 10/22/2012] [Accepted: 10/23/2012] [Indexed: 11/17/2022]
Abstract
Despite variability, the majority of HIV-1-infected individuals progress to AIDS characterized by high viral load and massive CD4+ T-cell depletion. However, there is a subset of HIV-1-positive individuals that does not progress and spontaneously maintains an undetectable viral load. This infrequent patient population is defined as HIV-1 controllers (HIV controllers), and represents less than 1% of HIV-1-infected patients. HIV-1-specific CD4+ T cells and the pool of central memory CD4+ T cells are also preserved despite immune activation due to HIV-1 infection. The majority of HIV controllers are also defined by the absence of massive CD4+ T-cell depletion, even after 10 years of infection. However, the mechanisms involved in protection against HIV-1 disease progression have not been elucidated yet. Controllers represent a heterogeneous population; we describe in this paper some common characteristics concerning innate immune response and CD4+ T cells of HIV controllers.
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166
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Abstract
Autoreactive B and T cells are present in healthy, autoimmunity-free individuals, but they are kept in check by various regulatory mechanisms. In systemic lupus erythematosus (SLE) patients, however, autoreactive cells are expanded, activated, and produce large quantities of autoantibodies, directed especially against nuclear antigens. These antibodies form immune complexes with self-nucleic acids present in SLE serum. Since self-DNA and self-RNA in the form of protein complexes can act as TLR9 and TLR7 ligands, respectively, TLR stimulation is suggested as an additional signal contributing to activation and/or modulation of the aberrant adaptive immune response. Data from mouse models suggest a pathogenic role for TLR7 and a protective role for TLR9 in the pathogenesis of SLE. Future investigations are needed to elucidate the underlying modulatory mechanisms and the role of TLR7 and TLR9 in the complex pathogenesis of human SLE.
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Affiliation(s)
- T Celhar
- Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), 8A Biomedical Grove, #03 Immunos, Singapore
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167
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Wonderlich ER, Barratt-Boyes SM. A dendrite in every pie: myeloid dendritic cells in HIV and SIV infection. Virulence 2012; 3:647-53. [PMID: 23154284 PMCID: PMC3545946 DOI: 10.4161/viru.22491] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Dendritic cells (DC) are a heterogeneous population of innate immune cells that are fundamental to initiating responses against invading pathogens and regulating immune responses. Myeloid DC (mDC) act as a bridge between the innate and adaptive immune response during virus infections but their role in immunity to human immunodeficiency virus (HIV) remains ill-defined. This review examines aspects of the mDC response to HIV and its simian counterpart, simian immunodeficiency virus (SIV), and emphasizes areas where our knowledge of mDC biology and function is incomplete. Defining the potentially beneficial and detrimental roles mDC play during pathogenic and stable infection of humans and nonhuman primates is crucial to our overall understanding of AIDS pathogenesis.
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168
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The equivalents of human blood and spleen dendritic cell subtypes can be generated in vitro from human CD34(+) stem cells in the presence of fms-like tyrosine kinase 3 ligand and thrombopoietin. Cell Mol Immunol 2012; 9:446-54. [PMID: 23085949 DOI: 10.1038/cmi.2012.48] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Dendritic cells (DCs) are immune cells specialized to capture, process and present antigen to T cells in order to initiate an appropriate adaptive immune response. The study of mouse DC has revealed a heterogeneous population of cells that differ in their development, surface phenotype and function. The study of human blood and spleen has shown the presence of two subsets of conventional DC including the CD1b/c(+) and CD141(+)CLEC9A(+) conventional DC (cDC) and a plasmacytoid DC (pDC) that is CD304(+)CD123(+). Studies on these subpopulations have revealed phenotypic and functional differences that are similar to those described in the mouse. In this study, the three DC subsets have been generated in vitro from human CD34(+) precursors in the presence of fms-like tyrosine kinase 3 ligand (Flt3L) and thrombopoietin (TPO). The DC subsets so generated, including the CD1b/c(+) and CLEC9A(+) cDCs and CD123(+) pDCs, were largely similar to their blood and spleen counterparts with respect to surface phenotype, toll-like receptor and transcription factor expression, capacity to stimulate T cells, cytokine secretion and cross-presentation of antigens. This system may be utilized to study aspects of DC development and function not possible in vivo.
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169
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Tel J, van der Leun AM, Figdor CG, Torensma R, de Vries IJM. Harnessing human plasmacytoid dendritic cells as professional APCs. Cancer Immunol Immunother 2012; 61:1279-88. [PMID: 22294456 PMCID: PMC3401502 DOI: 10.1007/s00262-012-1210-z] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Accepted: 01/19/2012] [Indexed: 12/23/2022]
Abstract
The plasmacytoid dendritic cell (pDC) constitutes a unique DC subset that links the innate and adaptive arm of the immune system. Whereas the unique capability of pDCs to produce large amounts of type I IFNs in response to pathogen recognition is generally accepted, their antigen-presenting function is often neglected since most studies on antigen presentation are aimed at other DC subsets. Recently, pDCs were demonstrated capable to present antigen leading to protective tumor immunity. In this review, we discuss how pDCs could be exploited in the fight against cancer by analyzing their capacity to capture, process and (cross-) present antigen.
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Affiliation(s)
- Jurjen Tel
- Department of Tumor Immunology, Radboud University Nijmegen Medical Centre and Nijmegen Centre for Molecular Life Sciences, Nijmegen, The Netherlands
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170
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Dzopalic T, Dragicevic A, Bozic B, Rajkovic I, Colic M. Dose-dependent response of dendritic cells to 7-thia-8-oxo-guanosine and its modulation by polyinosinic:polycytidylic acid. Exp Biol Med (Maywood) 2012; 237:784-92. [PMID: 22859738 DOI: 10.1258/ebm.2012.011409] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Targeting the endosomal Toll-like receptors (TLRs) by specific agonists seems to be a promising tool for stimulation of the immunogenicity of dendritic cells (DCs). Since the functional outcome upon the engagement of TLRs may be different, the aim of our study was to examine if and how different concentrations of 7-thia-8-oxo-guanosine (7-TOG), a selective TLR7 agonist, influence differentiation, maturation and functions of human monocyte-derived DCs (MoDCs) and if its effects on MoDCs could be modulated by co-ligation of TLR3. Immature MoDCs were treated with different concentrations of 7-TOG (25, 100 and 250 μmol/L) alone, or together with polyinosinic:polycytidylic acid, Poly (I:C) (10 ng/mL), a selective TLR3 agonist, for an additional 48 h. We showed that the highest concentration of 7-TOG stimulated the differentiation, maturation and allostimulatory capability of MoDCs. These changes were accompanied by an increased production of interleukin 12 (IL-12) and induction of T helper (Th)1 and Th17 immune responses. Both Th responses were significantly augmented by additional stimulation of MoDCs with Poly (I:C). The treatment of MoDCs with the intermediate concentration of 7-TOG resulted in the up-regulation of co-stimulatory molecule (CD86) and increased production of IL-1β and IL-6 by MoDCs, followed by the stimulation of the Th17 immune response. The lowest concentration of 7-TOG down-regulated the expression of CD40 on MoDCs and potentiated the Th2 immune response. The Th2 response was not significantly modulated by additional treatment of MoDCs with Poly (I:C), but this combination of TLR3/TLR7 agonists also stimulated both Th1 and Th17 responses. In conclusion, our results show that 7-TOG influences the phenotype and functions of MoDCs in a dose-dependent manner and suggests that fine-tuned signaling through TLR7 may be modified by the engagement of TLR3, resulting in a different outcome of immune response.
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Affiliation(s)
- Tanja Dzopalic
- Medical Faculty of the Military Medical Academy, University of Defense in Belgrade, Crnotravska 17, 11002 Belgrade, Serbia
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171
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Manuzak J, Dillon S, Wilson C. Differential interleukin-10 (IL-10) and IL-23 production by human blood monocytes and dendritic cells in response to commensal enteric bacteria. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2012; 19:1207-17. [PMID: 22695160 PMCID: PMC3416095 DOI: 10.1128/cvi.00282-12] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 06/05/2012] [Indexed: 02/07/2023]
Abstract
Human peripheral blood contains antigen-presenting cells (APC), including dendritic cells (DC) and monocytes, that may encounter microbes that have translocated from the intestine to the periphery in disease states like HIV-1 infection and inflammatory bowel disease. We investigated the response of DC and monocytes in peripheral blood mononuclear cells (PBMC) to a panel of representative commensal enteric bacteria, including Escherichia coli, Enterococcus sp., and Bacteroides fragilis. All three bacteria induced significant upregulation of the maturation and activation markers CD40 and CD83 on myeloid dendritic cells (mDC) and plasmacytoid dendritic cells (pDC). However, only mDC produced cytokines, including interleukin-10 (IL-10), IL-12p40/70, and tumor necrosis factor alpha (TNF-α), in response to bacterial stimulation. Cytokine profiles in whole PBMC differed depending on the stimulating bacterial species: B. fragilis induced production of IL-23, IL-12p70, and IL-10, whereas E. coli and Enterococcus induced an IL-10-predominant response. mDC and monocyte depletion experiments indicated that these cell types differentially produced IL-10 and IL-23 in response to E. coli and B. fragilis. Bacteroides thetaiotaomicron did not induce levels of IL-23 similar to those of B. fragilis, suggesting that B. fragilis may have unique proinflammatory properties among Bacteroides species. The addition of recombinant human IL-10 to PBMC cultures stimulated with commensal bacteria abrogated the IL-23 response, whereas blocking IL-10 significantly enhanced IL-23 production, suggesting that IL-10 controls the levels of IL-23 produced. These results indicate that blood mDC and monocytes respond differentially to innate stimulation with whole commensal bacteria and that IL-10 may play a role in controlling the proinflammatory response to translocated microbes.
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Affiliation(s)
- Jennifer Manuzak
- Department of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado, USA
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172
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Rhee JH, Lee SE, Kim SY. Mucosal vaccine adjuvants update. Clin Exp Vaccine Res 2012; 1:50-63. [PMID: 23596577 PMCID: PMC3623511 DOI: 10.7774/cevr.2012.1.1.50] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Revised: 05/25/2012] [Accepted: 06/15/2012] [Indexed: 12/16/2022] Open
Abstract
Mucosal vaccination, capable of inducing protective immune responses both in the mucosal and systemic immune compartments, has many advantages and is regarded as a blue ocean in the vaccine industry. Mucosal vaccines can offer lower costs, better accessability, needle-free delivery, and higher capacity of mass immunizations during pandemics. However, only very limited number of mucosal vaccines was approved for human use in the market yet. Generally, induction of immune responses following mucosal immunization requires the co-administration of appropriate adjuvants that can initiate and support the effective collaboration between innate and adaptive immunity. Classically, adjuvant researches were rather empirical than keenly scientific. However, during last several years, fundamental scientific achievements in innate immunity have been translated into the development of new mucosal adjuvants. This review focuses on recent developments in the concepts of adjuvants and innate immunity, mucosal immunity with special interest of vaccine development, and basic and applied researches in mucosal adjuvant.
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Affiliation(s)
- Joon Haeng Rhee
- Clinical Vaccine R&D Center, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Hwasun, Korea. ; Department of Microbiology and Research Institute of Vibrio Infections, Chonnam National University Medical School, Gwangju, Korea
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173
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Affiliation(s)
- E. Gros
- Department of Dermatology and Allergy; University of Bonn; Bonn; Germany
| | - N. Novak
- Department of Dermatology and Allergy; University of Bonn; Bonn; Germany
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174
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Karthaus N, Torensma R, Tel J. Deciphering the message broadcast by tumor-infiltrating dendritic cells. THE AMERICAN JOURNAL OF PATHOLOGY 2012; 181:733-42. [PMID: 22796439 DOI: 10.1016/j.ajpath.2012.05.012] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Revised: 04/25/2012] [Accepted: 05/17/2012] [Indexed: 02/07/2023]
Abstract
Human dendritic cells (DCs) infiltrate solid tumors, but this infiltration occurs in favorable and unfavorable disease prognoses. The statistical inference is that tumor-infiltrating DCs (TIDCs) play no conclusive role in predicting disease progression. This is remarkable because DCs are highly specialized antigen-presenting cells linking innate and adaptive immunity. DCs either boost the immune system (enhancing immunity) or dampen it (leading to tolerance). This dual effect explains the dual outcomes of cancer progression. The reverse functional characteristics of DCs depend on their maturation status. This review elaborates on the markers used to detect DCs in tumors. In many cases, the identification of DCs in human cancers relies on staining for S-100 and CD1a. These two markers are mainly expressed by Langerhans cells, which are one of several functionally different DC subsets. The activation status of DCs is based on the expression of CD83, DC-SIGN, and DC-LAMP, which are nonspecific markers of DC maturation. The detection of TIDCs has not kept pace with the increased knowledge about the identification of DC subsets and their maturation status. Therefore, it is difficult to draw a conclusion about the performance of DCs in tumors. We suggest a novel selection of markers to distinguish human DC subsets and maturation states. The use of these biomarkers will be of pivotal importance to scrutinize the prognostic significance of TIDCs.
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Affiliation(s)
- Nina Karthaus
- Department of Tumor Immunology, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, The Netherlands
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175
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Humpert ML, Tzouros M, Thelen S, Bignon A, Levoye A, Arenzana-Seisdedos F, Balabanian K, Bachelerie F, Langen H, Thelen M. Complementary methods provide evidence for the expression of CXCR7 on human B cells. Proteomics 2012; 12:1938-48. [DOI: 10.1002/pmic.201100581] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - Manuel Tzouros
- F. Hoffmann-La Roche Ltd,; TRS - CCC Proteins and Metabolites,; Functional and Pathway Proteomics; Basel Switzerland
| | - Sylvia Thelen
- Insitute for Research in Biomedicine; Bellinzona Switzerland
| | - Alexandre Bignon
- Laboratoire Cytokines,; Chemokines and Immunopathology,; Univ. Paris-Sud; Clamart France
- INSERM,; Laboratory of Excellence in Research on Medication and Innovative Therapeutics (LERMIT); Clamart France
| | - Angélique Levoye
- Department of Virology, INSERM U819 & Laboratory of Viral Pathogenesis,; Institut Pasteur; Paris France
| | | | - Karl Balabanian
- Laboratoire Cytokines,; Chemokines and Immunopathology,; Univ. Paris-Sud; Clamart France
- INSERM,; Laboratory of Excellence in Research on Medication and Innovative Therapeutics (LERMIT); Clamart France
| | - Françoise Bachelerie
- Department of Virology, INSERM U819 & Laboratory of Viral Pathogenesis,; Institut Pasteur; Paris France
| | - Hanno Langen
- F. Hoffmann-La Roche Ltd,; TRS - CCC Proteins and Metabolites,; Functional and Pathway Proteomics; Basel Switzerland
| | - Marcus Thelen
- Insitute for Research in Biomedicine; Bellinzona Switzerland
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176
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Kassianos AJ, Hardy MY, Ju X, Vijayan D, Ding Y, Vulink AJE, McDonald KJ, Jongbloed SL, Wadley RB, Wells C, Hart DNJ, Radford KJ. Human CD1c (BDCA-1)+ myeloid dendritic cells secrete IL-10 and display an immuno-regulatory phenotype and function in response to Escherichia coli. Eur J Immunol 2012; 42:1512-22. [DOI: 10.1002/eji.201142098] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | | | - Xinsheng Ju
- Dendritic Cell Program, Mater Medical Research Institute; South Brisbane; Queensland; Australia
| | - Dipti Vijayan
- Australian Institute for Bioengineering and Nanotechnology, University of Queensland; St Lucia; Queensland; Australia
| | - Yitian Ding
- Dendritic Cell Program, Mater Medical Research Institute; South Brisbane; Queensland; Australia
| | - Annelie J. E. Vulink
- Dendritic Cell Program, Mater Medical Research Institute; South Brisbane; Queensland; Australia
| | - Kylie J. McDonald
- Dendritic Cell Program, Mater Medical Research Institute; South Brisbane; Queensland; Australia
| | - Sarah L. Jongbloed
- Dendritic Cell Program, Mater Medical Research Institute; South Brisbane; Queensland; Australia
| | - Robert B. Wadley
- Dendritic Cell Program, Mater Medical Research Institute; South Brisbane; Queensland; Australia
| | - Christine Wells
- Australian Institute for Bioengineering and Nanotechnology, University of Queensland; St Lucia; Queensland; Australia
| | - Derek N. J. Hart
- Dendritic Cell Program, Mater Medical Research Institute; South Brisbane; Queensland; Australia
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177
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Reply to ‘TLR-2 ligand lipomannan from Mycobacterium tuberculosis does not stimulate inflammatory cytokines in dendritic cells’. AIDS 2012. [DOI: 10.1097/qad.0b013e3283543dbd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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178
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Xie Q, Luo J, Zhu Z, Wang G, Wang J, Niu B. Nucleofection of a DNA vaccine into human monocyte-derived dendritic cells. Cell Immunol 2012; 276:135-43. [PMID: 22632899 DOI: 10.1016/j.cellimm.2012.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2012] [Revised: 04/19/2012] [Accepted: 04/30/2012] [Indexed: 11/27/2022]
Abstract
An efficient method for delivering DNA vaccines into dendritic cells is considered to be of paramount importance. Electroporation-based technology (nucleofection) has gained increasingly popularity, but few reports focused on the possible functional consequences related to this method. In this study, the nucleofection technique was used to transfer the recombinant plasmid into hMoDCs for phenotype expression analysis and immunopotency detection. The results showed that the nucleofection of increasing concentrations of plasmid DNA decreased the viability of the hMoDCs. The welfare of nucleofected hMoDCs depended on the dosage of the plasmid and the plasmid's retention time within the cells. Accompanied by the process of nucleofection, it would bring some non-specific changes. The methodology reported here is suggestive of a feasible system for DNA vaccine transfer into hMoDCs with the caution of certain undesired effect.
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Affiliation(s)
- Qiu Xie
- Department of Biotechnology, Capital Institute of Pediatrics, Beijing 100020, China
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179
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Palma G, De Laurenzi V, De Marco M, Barbieri A, Petrillo A, Turco MC, Arra C. Plasmacytoids dendritic cells are a therapeutic target in anticancer immunity. Biochim Biophys Acta Rev Cancer 2012; 1826:407-14. [PMID: 22579960 DOI: 10.1016/j.bbcan.2012.04.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Revised: 04/27/2012] [Accepted: 04/28/2012] [Indexed: 01/07/2023]
Abstract
Dendritic cells (DCs) are immunological sentinels of the organism acting as antigen-presenting cells (APC) and are critical for induction of innate and adaptive immunity. Traditionally they are divided in myeloid dendritic cells (mDCs) and plasmacytoid dendritic cells (pDCs), a rare population of circulating cells that selectively express Toll-like receptors (TLR) 7 and TLR9 and have the capacity to produce large amounts of type I interferons (IFNs) in response to pathogenic agents or danger signals. It has been demonstrated that pDCs can coordinate events during the course of viral infections, allergic and autoimmune diseases and cancer. Through the production of type I IFNs, pDCs initiate protective immunity by activating classical DCs, T cells, natural killer cells and B cells. Upon activation, pDCs also differentiate into mature DCs and may contribute to the contraction of T-cell response. Human pDCs preferentially express immunoglobulin-like transcript 7 (ILT7; LILRA4), which couples with a signaling adapter to activate a prominent immune-receptor tyrosine-based activation motif (ITAM)-mediated signaling pathway. The interaction between ILT7 and bone marrow stromal cell antigen 2 (BST2, CD317) assures an appropriate TLR response by pDCs during viral infections and likely participates in pDCs tumor crosstalk. Moreover these cells seem to play a crucial role in the initiation of the pathological process of autoimmune diseases such as lupus or psoriasis. Despite the fact that their function within a tumor context is still controversial they represent an attractive target for therapeutic manipulation of the immune system to elicit a powerful immune response against tumor antigens in combination with other therapies.
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Affiliation(s)
- Giuseppe Palma
- Struttura Semplice Dipartimentale Sperimentazione Animale, Istituto Nazionale dei Tumori, Naples, Italy
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180
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Scharfe-Nugent A, Corr SC, Carpenter SB, Keogh L, Doyle B, Martin C, Fitzgerald KA, Daly S, O'Leary JJ, O'Neill LAJ. TLR9 provokes inflammation in response to fetal DNA: mechanism for fetal loss in preterm birth and preeclampsia. THE JOURNAL OF IMMUNOLOGY 2012; 188:5706-12. [PMID: 22544937 DOI: 10.4049/jimmunol.1103454] [Citation(s) in RCA: 128] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Preterm birth, the major cause of neonatal mortality in developed countries, is associated with intrauterine infections and inflammation, although the exact mechanisms underlying this event are unclear. In this study, we show that circulating fetal DNA, which is elevated in pregnancies complicated by preterm labor or preeclampsia, triggers an inflammatory reaction that results in spontaneous preterm birth. Fetal DNA activates NF-κB, shown by IκBα degradation in human PBMCs resulting in production of proinflammatory IL-6. We show that fetal resorption and preterm birth are rapidly induced in mice after i.p. injection of CpG or fetal DNA (300 μg/dam) on gestational day 10-14. In contrast, TLR9(-/-) mice were protected from these effects. Furthermore, this effect was blocked by oral administration of the TLR9 inhibitor chloroquine. Our data therefore provide a novel mechanism for preterm birth and preeclampsia, highlighting TLR9 as a potential therapeutic target for these common disorders of pregnancy.
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Affiliation(s)
- Andrea Scharfe-Nugent
- Department of Obstetrics and Gynaecology, Coombe Women & Infants University Hospital, Dublin 8, Ireland
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181
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Reuter S, Dehzad N, Martin H, Böhm L, Becker M, Buhl R, Stassen M, Taube C. TLR3 but not TLR7/8 ligand induces allergic sensitization to inhaled allergen. THE JOURNAL OF IMMUNOLOGY 2012; 188:5123-31. [PMID: 22491246 DOI: 10.4049/jimmunol.1101618] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Epidemiological studies suggest that viral infections during childhood are a risk factor for the development of asthma. However, the role of virus-specific pattern recognition receptors in this process is not well defined. In the current study, we compare the effects of the inhaled viral TLR ligands polyinosinic-polycytidylic acid (TLR3) and resiquimod (TLR7/8) on sensitization to a model allergen (OVA) in a murine model. Both compounds enhance the migration, activation, and Ag-processing of myeloid dendritic cells from the lung to the draining lymph nodes comparable to the effects of LPS. Application of polyinosinic-polycytidylic acid [poly(I:C)] or LPS induces production of allergen-specific IgE and IgG1, whereas resiquimod (R848) had no effect. In addition, rechallenge of mice with OVA resulted in airway inflammation and mucus production in animals that received either poly(I:C) or LPS but not after application of R848. In summary, these results show that activation of TLR3 in combination with inhaled allergen results in induction of dendritic cell activation and migration similar to the effects of LPS. This leads to the development of allergic airway disease after allergen rechallenge, whereas mice treated with R848 did not develop allergic airway disease. These findings give further insight into the effects of stimulation of different TLRs on the development of asthma.
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Affiliation(s)
- Sebastian Reuter
- III Department of Medicine, University Hospital Mainz, Mainz, Germany
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182
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Bruckner M, Dickel D, Singer E, Legler DF. Distinct modulation of chemokine expression patterns in human monocyte-derived dendritic cells by prostaglandin E(2). Cell Immunol 2012; 276:52-8. [PMID: 22565056 DOI: 10.1016/j.cellimm.2012.03.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 03/02/2012] [Accepted: 03/29/2012] [Indexed: 01/05/2023]
Abstract
Dendritic cells (DCs) are key in regulating immune responses. DCs reside in tissues facing the environment and sample their surrounding for pathogens. Upon pathogen encounter, DCs mature and migrate into secondary lymphoid organs. Distinct maturation signals dictate the ability of DCs to produce distinct patterns of chemokines that orchestrate immunity. Prostaglandin E(2) (PGE(2)) is produced during inflammation and modulates DC functions. We demonstrate that PGE(2) modulates distinct chemokine expression patterns of human monocyte-derived (Mo) DCs upon maturation with various stimuli. PGE(2) dampened early production of the inflammatory chemokines CCL2, CCL4, CCL5 and attenuated the expression of the T cell attractant CXCL10. In contrast, PGE(2) enhanced CXCL8 production early during maturation, whereas CXCL16 levels were continuously elevated, contributing to innate immune cell recruitment. Moreover, PGE(2) induces transcription of the homeostatic chemokines CCL17 and CCL22. Finally, mature MoDCs produced the homing chemokine CCL19 and its expression was down-regulated by PGE(2).
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Affiliation(s)
- Markus Bruckner
- Biotechnology Institute Thurgau at the University of Konstanz, Kreuzlingen, Switzerland
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183
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Panda B, Panda A, Ueda I, Abrahams VM, Norwitz ER, Stanic AK, Young BC, Ecker JL, Altfeld M, Shaw AC, Rueda BR. Dendritic cells in the circulation of women with preeclampsia demonstrate a pro-inflammatory bias secondary to dysregulation of TLR receptors. J Reprod Immunol 2012; 94:210-5. [PMID: 22440523 DOI: 10.1016/j.jri.2012.01.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Revised: 01/28/2012] [Accepted: 01/30/2012] [Indexed: 01/25/2023]
Abstract
Toll-like receptors (TLRs) are central components of the innate immune system that recognize both microbial ligands and host products released during tissue damage. Data from epidemiologic studies and animal models suggest that inappropriate activation of the immune system plays a critical role in the development of preeclampsia. This study evaluates in a systematic fashion the expression and function of TLRs in the circulation of patients with preeclampsia compared to healthy pregnant controls. We evaluated TLR expression and function in primary dendritic cells (DCs) of 30 patients with preeclampsia and 30 gestational age-matched healthy pregnant controls. DCs were stimulated with the different TLR ligands engaging TLR1/2, TLR2/6, TLR3, TLR4, TLR5, TLR7, TLR8 and TLR9. The expression of TLR-induced production of TNF-α, IFN-α, IL-6, and IL-12 were measured by multicolor flow cytometry. Basal expression of TLR3, TLR4 and TLR9 was significantly increased in DCs isolated from women with preeclampsia. Preeclamptic DCs also expressed significantly higher basal levels of cytokines. In contrast, preeclamptic DCs demonstrated a less robust response to stimulation with various TLR ligands as compared with healthy pregnant controls. Under basal conditions, DCs from preeclamptic individuals express higher levels of select TLRs and produce more pro-inflammatory cytokines as compared with healthy controls. As such, the ability of these cells to mount an inflammatory reaction in response to a TLR ligand is limited. These data demonstrate a dysregulated pattern of TLR expression and cytokine production in DCs from PE patients that may limit further activation by TLR engagement.
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Affiliation(s)
- Britta Panda
- Massachusetts General Hospital, Department of Obstetrics & Gynecology, Division of Maternal-Fetal Medicine, Boston, MA 02114, USA.
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184
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Pahl JHW, Verhoeven DHJ, Kwappenberg KMC, Vellinga J, Lankester AC, van Tol MJD, Schilham MW. Adenovirus type 35, but not type 5, stimulates NK cell activation via plasmacytoid dendritic cells and TLR9 signaling. Mol Immunol 2012; 51:91-100. [PMID: 22424784 DOI: 10.1016/j.molimm.2012.02.119] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Accepted: 02/20/2012] [Indexed: 12/24/2022]
Abstract
In hematopoietic stem cell transplant (HSCT) recipients, disseminated adenoviral infections during the first two months after HSCT can lead to severe complications and fatal outcome. Since NK cells are usually the first lymphocytes to reconstitute after HSCT and have been implicated in the clearance of adenovirus-infected cells, it was investigated whether NK cells are activated by adenovirus in vitro. Exposure of PBMC to human adenovirus type 5 (HAdV5) or HAdV35 resulted in the up-regulation of the activation marker CD69 on NK cells and enhanced the cytolytic activity of NK cells. HAdV5-induced NK cell activation relied on the contribution of T cells as the depletion of T cells from PBMC abolished NK cell activation. In contrast, NK cell activation in response to HAdV35 occurred in the absence of T cells. Plasmacytoid dendritic cells (pDC) were necessary and sufficient to mediate NK cell activation. HAdV35 induced significantly more interferon-α (IFN-α) production by pDC than HAdV5. The increased IFN-α production and NK cell activation correlated with a higher infection efficiency of viruses with the type 35 fiber. The IFN-α response of pDC was enhanced by the presence of NK cells, suggesting a reciprocal interaction between pDC and NK cells. Incubation with a TLR9 antagonist impaired the IFN-α production by pDC as well as NK cell activation, implying that TLR9 signaling is critically involved in the IFN-α response of pDC and NK cell activation after HAdV35 exposure. In conclusion, two human adenovirus serotypes from two different species differ considerably in their capacity to stimulate pDC and NK cells.
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Affiliation(s)
- Jens H W Pahl
- Department of Pediatrics, Leiden University Medical Centre, Leiden, The Netherlands
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185
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Lipid-derived nanoparticles for immunostimulatory RNA adjuvant delivery. Proc Natl Acad Sci U S A 2012; 109:E797-803. [PMID: 22421433 DOI: 10.1073/pnas.1121423109] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The specific activation of Toll-like receptors (TLRs) has potential utility for a variety of therapeutic indications including antiviral immunotherapy and as vaccine adjuvants. TLR7 and TLR 8 may be activated by their native ligands, single-stranded RNA, or by small molecules of the imidazoquinoline family. However the use of TLR7/8 agonists for in vivo therapy is limited by instability, in the case of RNA, or systemic biodistribution and toxicity in the case of small molecule agonists. We hypothesized that unique lipid-like materials, termed "lipidoids," could be designed to efficiently deliver immunostimulatory RNA (isRNA) to TLR-expressing cells to drive innate and adaptive immune responses. A library of lipidoids was synthesized and screened for the ability to induce type I IFN activation in human peripheral blood mononuclear cells when combined with isRNA oligonucleotides. Effective lipidoid-isRNA nanoparticles, when tested in mice, stimulated strong IFN-α responses following subcutaneous injection, had robust antiviral activity that suppressed influenza virus replication, and enhanced antiovalbumin humoral and cell-mediated responses when used as a vaccine adjuvant. Further, we demonstrate that whereas all immunological activity was MyD88-dependent, certain materials were found to engage both TLR7-dependent and TLR7-independent activity in the mouse suggestive of cell-specific delivery. These lipidoid formulations, which are materials designed specifically for delivery of isRNA to Toll-like receptors, were superior to the commonly used N-[1-(2,3-dioleoyloxy)propyl]-N,N,N-trimethylammonium methylsulfate-RNA delivery system and may provide new tools for the manipulation of TLR responses in vitro and in vivo.
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186
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Lumsden JM, Nurmukhambetova S, Klein JH, Sattabongkot J, Bennett JW, Bertholet S, Fox CB, Reed SG, Ockenhouse CF, Howard RF, Polhemus ME, Yadava A. Evaluation of immune responses to a Plasmodium vivax CSP-based recombinant protein vaccine candidate in combination with second-generation adjuvants in mice. Vaccine 2012; 30:3311-9. [PMID: 22425788 DOI: 10.1016/j.vaccine.2012.03.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 02/01/2012] [Accepted: 03/01/2012] [Indexed: 12/12/2022]
Abstract
Plasmodium vivax is the major cause of malaria outside of sub-Saharan Africa and causes morbidity and results in significant economic impact in developing countries. In order to produce a P. vivax vaccine for global use, we have previously reported the development of VMP001, based on the circumsporozoite protein (CSP) of P. vivax. Our interest is to evaluate second-generation vaccine formulations to identify novel combinations of adjuvants capable of inducing strong, long-lasting immune responses. In this study, groups of C57BL/6J mice were immunized subcutaneously three times with VMP001 emulsified with synthetic TLR4 (GLA) or TLR7/8 (R848) agonist in stable emulsion (SE), a combination of the TLR4 and TLR7/8 agonists, or SE alone. Sera and splenocytes were tested for the presence of antigen-specific humoral and cellular responses, respectively. All groups of mice generated high titers of anti-P. vivax IgG antibodies as detected by ELISA and immunofluorescence assay. GLA-SE promoted a shift in the antibody response to a Th1 profile, as demonstrated by the change in IgG2c/IgG1 ratio. In addition, GLA-SE induced a strong cellular immune response characterized by multi-functional, antigen-specific CD4(+) T cells secreting IL-2, TNF and IFN-γ. In contrast, mice immunized with SE or R848-SE produced low numbers of antigen-specific CD4(+) T cells, and these T cells secreted IL-2 and TNF, but not IFN-γ. Finally, R848-SE did not enhance the immune response compared to GLA-SE alone. Based on these results, we conclude that the combination of VMP001 and GLA-SE is highly immunogenic in mice and may serve as a potential second-generation vaccine candidate against vivax malaria.
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Affiliation(s)
- Joanne M Lumsden
- Malaria Vaccine Branch United States, Military Malaria Research Program, Walter Reed Army Institute of Research, Silver Spring, MD 20910, United States
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187
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Goutagny N, Estornes Y, Hasan U, Lebecque S, Caux C. Targeting pattern recognition receptors in cancer immunotherapy. Target Oncol 2012; 7:29-54. [PMID: 22399234 DOI: 10.1007/s11523-012-0213-1] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Accepted: 01/13/2012] [Indexed: 12/20/2022]
Abstract
Pattern recognition receptors (PRRs) are known for many years for their role in the recognition of microbial products and the subsequent activation of the immune system. The 2011 Nobel Prize for medicine indeed rewarded J. Hoffmann/B. Beutler and R. Steinman for their revolutionary findings concerning the activation of the immune system, thus stressing the significance of understanding the mechanisms of activation of the innate immunity. Such immunostimulatory activities are of major interest in the context of cancer to induce long-term antitumoral responses. Ligands for the toll-like receptors (TLRs), a well-known family of PRR, have been shown to have antitumoral activities in several cancers. Those ligands are now undergoing extensive clinical investigations both as immunostimulant molecules and as adjuvant along with vaccines. However, when considering the use of these ligands in tumor therapy, one shall consider the potential effect on the tumor cells themselves as well as on the entire organism. Recent data indeed demonstrate that TLR activation in tumor cells could trigger both pro- or antitumoral effect depending on the context. This review discusses this balance between the intrinsic activation of PRR in tumor cells and the extrinsic microenvironment activation in term of overall effect of PRR ligands on tumor development. We review recent advances in the field and underline appealing prospects for clinical development of PRR agonists in the light of our current knowledge on their expression and activation.
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Affiliation(s)
- Nadège Goutagny
- Université de Lyon, Université Lyon I, UMR INSERM 1052 CNRS 5286, Centre de Recherche en Cancérologie de Lyon, Centre Léon Bérard, Lyon, France.
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188
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Wattrang E, Palm AK, Wagner B. Cytokine production and proliferation upon in vitro oligodeoxyribonucleotide stimulation of equine peripheral blood mononuclear cells. Vet Immunol Immunopathol 2012; 146:113-24. [PMID: 22397968 DOI: 10.1016/j.vetimm.2012.02.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Revised: 02/01/2012] [Accepted: 02/09/2012] [Indexed: 11/28/2022]
Abstract
Synthetic oligodeoxyribonucleotides (ODN) may prove useful immune modulators in equine medicine. It is however important to assess the effects of each specific ODN in the species it is intended to be used in. The present study therefore aimed to evaluate some ODN for induction of cytokine production; i.e. type I interferons (IFN), IFN-γ, tumor necrosis factor-α (TNF-α) and transforming growth factor-β (TGF-β), and proliferation of equine peripheral blood mononuclear cells (PBMC). A panel of four ODN containing unmethylated cytosine-guanosine sequences (CpG) was used: ODN 1 and ODN 8 representing A-class; ODN 2006 representing B-class and ODN 2395 representing C-class-ODN. In addition, two ODN where CpG-motifs were reversed to GpC were included; ODN 2137 otherwise identical to ODN 2006 and ODN 5328 otherwise identical to ODN 2395. Cytokine concentrations were measured in cell culture supernatants after 24h of induction and proliferation was determined after 72 h of induction. Each ODN was tested with PBMC from at least 5 individual horses with and without the addition of lipofectin to cell cultures. Type I IFN, IFN-γ and TNF-α production was readily induced by ODN 1, ODN 2006 and ODN 2395 both in the presence and absence of lipofectin and all three types of ODN induced similar levels of cytokines. Proliferation of PBMC was clearly induced by ODN 2006 and ODN 2395 while ODN 1 only induced low-level proliferation. The levels of proliferation induced were not influenced by the presence of lipofectin. TGF-β production was not induced by any of the tested ODN. ODN 8, ODN 2137 and ODN 5328 were largely inactive in all assays. Thus, responses seemed dependent on or increased by CpG-motifs but presence of CpG-motifs did not necessarily confer activity since ODN 8 was inactive despite its CpG-motifs. Taken together, with equine PBMC distinctions in induction of different leukocyte functions between A-, B-, and C-class ODN were less obvious than what has been observed for human cells. These observations further stress the presence of species differences in ODN-induced responses.
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Affiliation(s)
- Eva Wattrang
- Department of Virology, Immunobiology and Parasitology, National Veterinary Institute, SE-751 89 Uppsala, Sweden.
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189
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Kalb ML, Glaser A, Stary G, Koszik F, Stingl G. TRAIL+ Human Plasmacytoid Dendritic Cells Kill Tumor Cells In Vitro: Mechanisms of Imiquimod- and IFN-α–Mediated Antitumor Reactivity. THE JOURNAL OF IMMUNOLOGY 2012; 188:1583-91. [DOI: 10.4049/jimmunol.1102437] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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190
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Targeting Dendritic Cells for Improved HIV-1 Vaccines. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 762:263-88. [DOI: 10.1007/978-1-4614-4433-6_10] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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191
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Gujer C, Sundling C, Seder RA, Karlsson Hedestam GB, Loré K. Human and rhesus plasmacytoid dendritic cell and B-cell responses to Toll-like receptor stimulation. Immunology 2011; 134:257-69. [PMID: 21977996 DOI: 10.1111/j.1365-2567.2011.03484.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Interferon-α (IFN-α) produced at high levels by human plasmacytoid dendritic cells (pDCs) can specifically regulate B-cell activation to Toll-like receptor (TLR) 7/8 stimulation. To explore the influence of IFN-α and pDCs on B-cell functions in vivo, studies in non-human primates that closely resemble humans in terms of TLR expression on different subsets of immune cells are valuable. Here, we performed a side-by side comparison of the response pattern between human and rhesus macaque B cells and pDCs in vitro to well-defined TLR ligands and tested whether IFN-α enhanced B-cell function comparably. We found that both human and rhesus B cells proliferated while pDCs from both species produced high levels of IFN-α in response to ligands targeting TLR7/8 and TLR9. Both human and rhesus B-cell proliferation to TLR7/8 ligand and CpG class C was significantly increased in the presence of IFN-α. Although both human and rhesus B cells produced IgM upon stimulation, only human B cells acquired high expression of CD27 associated with plasmablast formation. Instead, rhesus B-cell differentiation and IgM levels correlated to down-regulation of CD20. These data suggest that the response pattern of human and rhesus B cells and pDCs to TLR7/8 and TLR9 is similar, although some differences in the cell surface phenotype of the differentiating cells exist. A more thorough understanding of potential similarities and differences between human and rhesus cells and their response to potential vaccine components will provide important information for translating non-human primate studies into human trials.
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Affiliation(s)
- Cornelia Gujer
- Center for Infectious Medicine, Department of Medicine, Karolinska Institutet, Stockholm, Sweden
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192
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Generalized immune activation and innate immune responses in simian immunodeficiency virus infection. Curr Opin HIV AIDS 2011; 6:411-8. [PMID: 21743324 DOI: 10.1097/coh.0b013e3283499cf6] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
PURPOSE OF REVIEW Chronic immune activation is a key factor driving the immunopathogenesis of AIDS. During pathogenic HIV/simian immunodeficiency virus (SIV) infections, innate and adaptive antiviral immune responses contribute to chronic immune activation. In contrast, nonpathogenic SIV infections of natural hosts such as sooty mangabeys and African green monkeys (AGMs) are characterized by low immune activation despite similarly high viremia. This review focuses on the role of innate immune responses in SIV infection. RECENT FINDINGS Several studies have examined the role of innate immune responses to SIV as potential drivers of immune activation. The key result of these studies is that both pathogenic SIV infection of macaques and nonpathogenic SIV infections of natural hosts are associated with strong innate immune responses to the virus, high production of type I interferons by plasmacytoid dendritic cells, and upregulation of interferon-stimulated genes (ISGs). However, SIV-infected sooty mangabeys and AGMs (but not SIV-infected macaques) rapidly downmodulate the interferon response within 4-6 weeks of infection, thus resulting in a state of limited immune activation during chronic infection. SUMMARY Studies in nonhuman primates suggest that chronic innate/interferon responses may contribute to AIDS pathogenesis. Further, the ability of natural host species to resolve innate immune responses after infection provides a novel avenue for potential immunotherapy.
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193
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Kou PM, Pallassana N, Bowden R, Cunningham B, Joy A, Kohn J, Babensee JE. Predicting biomaterial property-dendritic cell phenotype relationships from the multivariate analysis of responses to polymethacrylates. Biomaterials 2011; 33:1699-713. [PMID: 22136715 DOI: 10.1016/j.biomaterials.2011.10.066] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Accepted: 10/24/2011] [Indexed: 12/27/2022]
Abstract
Dendritic cells (DCs) play a critical role in orchestrating the host responses to a wide variety of foreign antigens and are essential in maintaining immune tolerance. Distinct biomaterials have been shown to differentially affect the phenotype of DCs, which suggested that biomaterials may be used to modulate immune response toward the biologic component in combination products. The elucidation of biomaterial property-DC phenotype relationships is expected to inform rational design of immuno-modulatory biomaterials. In this study, DC response to a set of 12 polymethacrylates (pMAs) was assessed in terms of surface marker expression and cytokine profile. Principal component analysis (PCA) determined that surface carbon correlated with enhanced DC maturation, while surface oxygen was associated with an immature DC phenotype. Partial square linear regression, a multivariate modeling approach, was implemented and successfully predicted biomaterial-induced DC phenotype in terms of surface marker expression from biomaterial properties with R(prediction)(2) = 0.76. Furthermore, prediction of DC phenotype was effective based on only theoretical chemical composition of the bulk polymers with R(prediction)(2) = 0.80. These results demonstrated that immune cell response can be predicted from biomaterial properties, and computational models will expedite future biomaterial design and selection.
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Affiliation(s)
- Peng Meng Kou
- Wallace H Coulter Department of Biomedical Engineering at Georgia Tech and Emory University, Georgia Institute of Technology, Atlanta, GA 30332, USA
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194
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Takagi M. Toll-like receptor--a potent driving force behind rheumatoid arthritis. J Clin Exp Hematop 2011; 51:77-92. [PMID: 22104306 DOI: 10.3960/jslrt.51.77] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Toll like receptor (TLR), one of the key functions of innate immune system, can recognize not only exogenous pathogen-associated molecular patterns, namely PAMPs, but also endogenous molecules created upon tissue injury, sterile inflammation and degeneration. Endogenous TLR ligands are called as damage-associated molecular patters (DAMPs), including endogenous molecules released by activated and necrotic cells, and extracellular matrix molecules. DAMPs are also known as alarmins. TLR research has brought about new insights in the rheumatic diseases. Previous reports suggest that TLRs and the signal pathways intensively contribute to the pathogenesis of rheumatoid arthritis (RA) and other arthritic conditions with interaction of various TLR ligands. Accumulated knowledge of TLR system is summarized to overlook TLRs and the signaling pathway in arthritis conditions, with special reference to RA.
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Affiliation(s)
- Michiaki Takagi
- Department of Orthopaedic Surgery, Yamagata University School of Medicine, Japan.
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195
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dos Santos BP, Valverde JV, Rohr P, Monticielo OA, Brenol JCT, Xavier RM, Chies JAB. TLR7/8/9 polymorphisms and their associations in systemic lupus erythematosus patients from Southern Brazil. Lupus 2011; 21:302-9. [DOI: 10.1177/0961203311425522] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Systemic lupus erythematosus (SLE) is a chronic inflammatory autoimmune disease and can affect several organs and systems. It is characterized by high production of autoantibodies against nuclear compounds. TLR7/8/9 are responsible for nucleic acid recognition and they trigger proinflammatory responses through activation of NK-kappaB and Type I IFN production, making a bridge between the innate and the adaptative immune systems. We analyzed the frequency of TLR7 rs179008, TLR8 rs3764880, TLR9 rs5743836 and rs352140 in 370 patients with SLE and 415 healthy controls from southern Brazil. All analyses were conducted with regard to gender and ethnicity. Genotypic and allelic frequencies were different for TLR7 rs179008 (0.253 vs. 0.163, p = 0.020 and p = 0.003, OR for T allele: 1.74 CI 95% 1.12–2.70) and TLR9 rs5743836 (0.174 vs. 0.112, p = 0.045 and p = 0.017, OR for C allele: 1.59, CI 95% 0.99–2.57) between European-derived female groups. A higher frequency was observed for the presence of Anti-SSa/Ro for TRL9 rs5743836 C allele carriers (0.228 vs 0.126, Bonferroni corrected p = 0.06). No statistical differences were found for TLR9 haplotypic analyses. We suggest that TLR7 rs179008 and TLR9 rs5743836 can be considered SLE susceptibility factors for women of European descent in our population.
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Affiliation(s)
- BP dos Santos
- Laboratory of Immunogenetics, Department of Genetics, Universidade Federal do Rio Grande do Sul, Brazil
| | - JV Valverde
- Laboratory of Immunogenetics, Department of Genetics, Universidade Federal do Rio Grande do Sul, Brazil
| | - P Rohr
- Laboratory of Immunogenetics, Department of Genetics, Universidade Federal do Rio Grande do Sul, Brazil
| | - OA Monticielo
- Division of Rheumatology, Department of Internal Medicine, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Brazil
- Department of Internal Medicine, Universidade Federal de Santa Maria, Brazil
| | - JCT Brenol
- Division of Rheumatology, Department of Internal Medicine, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Brazil
| | - RM Xavier
- Division of Rheumatology, Department of Internal Medicine, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Brazil
| | - JAB Chies
- Laboratory of Immunogenetics, Department of Genetics, Universidade Federal do Rio Grande do Sul, Brazil
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196
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Dissecting the role of dendritic cells in simian immunodeficiency virus infection and AIDS. Immunol Res 2011; 50:228-34. [PMID: 21717075 DOI: 10.1007/s12026-011-8220-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Human immunodeficiency virus (HIV) infection is associated with the loss of the two principal types of dendritic cell (DC), myeloid DC (mDC) and plasmacytoid DC (pDC), but the mechanism of this loss and its relationship to AIDS pathogenesis remain ill-defined. The nonhuman primate is a powerful model to dissect this response for several reasons. Both DC subsets have been well characterized in nonhuman primates and shown to have strikingly similar phenotypic and functional characteristics to their counterparts in the human. Moreover, decline of mDC and pDC occurs in rhesus macaques with end-stage simian immunodeficiency virus (SIV) infection, the model of HIV infection in humans. In this brief review, we discuss what is known about DC subsets in pathogenic and nonpathogenic nonhuman primate models of HIV infection and highlight the advances and controversies that currently exist in the field.
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197
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Barreira da Silva R, Münz C. Natural killer cell activation by dendritic cells: balancing inhibitory and activating signals. Cell Mol Life Sci 2011; 68:3505-18. [PMID: 21861182 PMCID: PMC11114903 DOI: 10.1007/s00018-011-0801-8] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 08/08/2011] [Accepted: 08/08/2011] [Indexed: 01/06/2023]
Abstract
Natural killer (NK) cells have originally been identified by their spontaneous cytolytic potential against tumor cells, which, however, might result from pre-activation due to prior pathogen exposure. Resting NK cells, on the contrary, require activation by bystander antigen-presenting cells to reach their full functional competence. In this review, we will summarize studies on how dendritic cells (DCs), the most potent type of antigen-presenting cell, communicate with human NK cells to activate them in secondary lymphoid organs and to integrate signals from activated NK cells at sites of inflammation for their own maturation. Furthermore, we will review aspects of the immunological synapse, which mediates this cross-talk. These studies provide the mechanistic understanding of how mature DCs can activate NK cells and survive to go on for the activation of adaptive immunity. This feature of DCs, to activate different waves of immune responses, could be harnessed for immunotherapies, including vaccinations.
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Affiliation(s)
- Rosa Barreira da Silva
- Department of Viral Immunobiology, Institute of Experimental Immunology, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
- Instituto de Ciências Biomédicas Abel Salazar and Graduate Program in Areas of Basic and Applied Biology (GABBA), University of Porto, Porto, Portugal
| | - Christian Münz
- Department of Viral Immunobiology, Institute of Experimental Immunology, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
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198
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Larangé A, Antonios D, Pallardy M, Kerdine-Römer S. Glucocorticoids inhibit dendritic cell maturation induced by Toll-like receptor 7 and Toll-like receptor 8. J Leukoc Biol 2011; 91:105-17. [DOI: 10.1189/jlb.1110615] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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199
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TLR7 and TLR8 gene variations and susceptibility to hepatitis C virus infection. PLoS One 2011; 6:e26235. [PMID: 22022576 PMCID: PMC3192790 DOI: 10.1371/journal.pone.0026235] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2011] [Accepted: 09/22/2011] [Indexed: 01/29/2023] Open
Abstract
Toll-like receptors (TLRs) play pivotal roles in the innate immune system and control inflammatory responses and adaptive immunity. We previously evaluated associations between TLR7 and TLR8 gene SNPs and susceptibility to hepatitis C virus (HCV) infection. Our results suggested that TLR7IVS2-151G and TLR8-129G alleles were present at higher frequency in males of an HCV-infected group as compared to a control group (24.1% vs. 14.4%, p = 0.028; 17.6% vs. 6.8%, p = 0.004, respectively). Based upon their recognition of single stranded viral RNA, this suggested that TLR7 and TLR8 played a significant role in anti-HCV immune responses. Here, we studied the functional effects of these polymorphisms by analyzing the mRNA expressions of TLR7 and TLR8 and cytokine production induced ex vivo by TLR7- and TLR8-specific agonists using whole blood of subjects with different genotypes. The percentage of CD14+ cells from those with an AG haplotype that expressed TLR7 and TLR8 was significantly lower, but higher in intensity compared to cells from those with GG and AC haplotypes. Cells from those with an AG haplotype produced more IFN-α and less amounts of pro-inflammatory cytokines upon stimulation. This suggests that variations in TLR7 and TLR8 genes might impair immune responses during HCV infection.
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200
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Dendritic cells in human atherosclerosis: from circulation to atherosclerotic plaques. Mediators Inflamm 2011; 2011:941396. [PMID: 21976788 PMCID: PMC3184502 DOI: 10.1155/2011/941396] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Accepted: 07/31/2011] [Indexed: 01/11/2023] Open
Abstract
Background. Atherosclerosis is a chronic inflammatory disease with atherosclerotic plaques containing inflammatory infiltrates predominantly consisting of monocytes/macrophages and activated T cells. More recent is the implication of dendritic cells (DCs) in the disease. Since DCs were demonstrated in human arteries in 1995, numerous studies in humans suggest a role for these professional antigen-presenting cells in atherosclerosis. Aim. This paper focuses on the observations made in blood and arteries of patients with atherosclerosis. In principal, flow cytometric analyses show that circulating myeloid (m) and plasmacytoid (p) DCs are diminished in coronary artery disease, while immunohistochemical studies describe increased intimal DC counts with evolving plaque stages. Moreover, mDCs and pDCs appear to behave differently in atherosclerosis. Yet, the origin of plaque DCs and their relationship with blood DCs are unknown. Therefore, several explanations for the observed changes are postulated. In addition, the technical challenges and discrepancies in the research field are discussed. Future. Future studies in humans, in combination with experimental animal studies will unravel mechanisms leading to altered blood and plaque DCs in atherosclerosis. As DCs are crucial for inducing but also dampening immune responses, understanding their life cycle, trafficking and function in atherosclerosis will determine potential use of DCs in antiatherogenic therapies.
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