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Walker EM, Merino KM, Slisarenko N, Grasperge BF, Mehra S, Roy CJ, Kaushal D, Rout N. Impact of SIV infection on mycobacterial lipid-reactive T cell responses in Bacillus Calmette-Guérin (BCG) inoculated macaques. Front Immunol 2023; 13:1085786. [PMID: 36726992 PMCID: PMC9885173 DOI: 10.3389/fimmu.2022.1085786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 12/28/2022] [Indexed: 01/18/2023] Open
Abstract
Background Although BCG vaccine protects infants from tuberculosis (TB), it has limited efficacy in adults against pulmonary TB. Further, HIV coinfection significantly increases the risk of developing active TB. In the lack of defined correlates of protection in TB disease, it is essential to explore immune responses beyond conventional CD4 T cells to gain a better understanding of the mechanisms of TB immunity. Methods Here, we evaluated unconventional lipid-reactive T cell responses in cynomolgus macaques following aerosol BCG inoculation and examined the impact of subsequent SIV infection on these responses. Immune responses to cellular lipids of M. bovis and M. tuberculosis were examined ex vivo in peripheral blood and bronchioalveolar lavage (BAL). Results Prior to BCG inoculation, innate-like IFN-γ responses to mycobacterial lipids were observed in T cells. Aerosol BCG exposure induced an early increase in frequencies of BAL γδT cells, a dominant subset of lipid-reactive T cells, along with enhanced IL-7R and CXCR3 expression. Further, BCG exposure stimulated greater IFN-γ responses to mycobacterial lipids in peripheral blood and BAL, suggesting the induction of systemic and local Th1-type response in lipid-reactive T cells. Subsequent SIV infection resulted in a significant loss of IL-7R expression on blood and BAL γδT cells. Additionally, IFN-γ responses of mycobacterial lipid-reactive T cells in BAL fluid were significantly lower in SIV-infected macaques, while perforin production was maintained through chronic SIV infection. Conclusions Overall, these data suggest that despite SIV-induced decline in IL-7R expression and IFN-γ production by mycobacterial lipid-reactive T cells, their cytolytic potential is maintained. A deeper understanding of anti-mycobacterial lipid-reactive T cell functions may inform novel approaches to enhance TB control in individuals with or without HIV infection.
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Affiliation(s)
- Edith M. Walker
- Division of Microbiology at Tulane National Primate Research Center, Covington, LA, United States
| | - Kristen M. Merino
- Division of Microbiology at Tulane National Primate Research Center, Covington, LA, United States
| | - Nadia Slisarenko
- Division of Microbiology at Tulane National Primate Research Center, Covington, LA, United States
| | - Brooke F. Grasperge
- Division of Microbiology at Tulane National Primate Research Center, Covington, LA, United States
| | - Smriti Mehra
- Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, TX, United States
| | - Chad J. Roy
- Division of Microbiology at Tulane National Primate Research Center, Covington, LA, United States
- Department of Microbiology and Immunology, Tulane University School of Medicine, New Orleans, LA, United States
| | - Deepak Kaushal
- Southwest National Primate Research Center, Texas Biomedical Research Institute, San Antonio, TX, United States
| | - Namita Rout
- Division of Microbiology at Tulane National Primate Research Center, Covington, LA, United States
- Department of Microbiology and Immunology, Tulane University School of Medicine, New Orleans, LA, United States
- Tulane Center for Aging, Tulane University School of Medicine, New Orleans, LA, United States
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Nelson A, Lukacs JD, Johnston B. The Current Landscape of NKT Cell Immunotherapy and the Hills Ahead. Cancers (Basel) 2021; 13:cancers13205174. [PMID: 34680322 PMCID: PMC8533824 DOI: 10.3390/cancers13205174] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 10/05/2021] [Accepted: 10/05/2021] [Indexed: 12/15/2022] Open
Abstract
Simple Summary Natural killer T (NKT) cells are a subset of lipid-reactive T cells that enhance anti-tumor immunity. While preclinical studies have shown NKT cell immunotherapy to be safe and effective, clinical studies lack predictable therapeutic efficacy and no approved treatments exist. In this review, we outline the current strategies, challenges, and outlook for NKT cell immunotherapy. Abstract NKT cells are a specialized subset of lipid-reactive T lymphocytes that play direct and indirect roles in immunosurveillance and anti-tumor immunity. Preclinical studies have shown that NKT cell activation via delivery of exogenous glycolipids elicits a significant anti-tumor immune response. Furthermore, infiltration of NKT cells is associated with a good prognosis in several cancers. In this review, we aim to summarize the role of NKT cells in cancer as well as the current strategies and status of NKT cell immunotherapy. This review also examines challenges and future directions for improving the therapy.
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Affiliation(s)
- Adam Nelson
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada; (A.N.); (J.D.L.)
- Beatrice Hunter Cancer Research Institute, Halifax, NS B3H 4R2, Canada
| | - Jordan D. Lukacs
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada; (A.N.); (J.D.L.)
- Beatrice Hunter Cancer Research Institute, Halifax, NS B3H 4R2, Canada
| | - Brent Johnston
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS B3H 4R2, Canada; (A.N.); (J.D.L.)
- Beatrice Hunter Cancer Research Institute, Halifax, NS B3H 4R2, Canada
- Department of Pediatrics, Dalhousie University, Halifax, NS B3H 4R2, Canada
- Department of Pathology, Dalhousie University, Halifax, NS B3H 4R2, Canada
- Correspondence:
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3
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Abstract
PURPOSE OF REVIEW To analyze the possible role that the 'unconventional' T-cell populations mucosal-associated invariant T cell (MAIT) and iNKT cells play during HIV infection and following antiretroviral therapy (ART) treatment. RECENT FINDINGS A substantial body of evidence now demonstrates that both MAIT and iNKT cells are depleted in blood during HIV infection. The depletion and dysfunction of MAIT and iNKT cells are only partially restored by suppressive ART, potentially contributing to HIV-related comorbidities. SUMMARY The deficiency and dysfunction of MAIT and iNKT T-cell subsets likely impact on immunity to important coinfections including Mycobacterium tuberculosis. This underscores the importance of research on restoring these unconventional T cells during HIV infection. Future studies in this field should address the challenge of studying tissue-resident cells, particularly in the gut, and better defining the determinants of MAIT/iNKT cell dysfunction. Such studies could have a significant impact on improving the immune function of HIV-infected individuals.
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Salwe S, Padwal V, Nagar V, Patil P, Patel V. T cell functionality in HIV-1, HIV-2 and dually infected individuals: correlates of disease progression and immune restoration. Clin Exp Immunol 2019; 198:233-250. [PMID: 31216050 PMCID: PMC6797902 DOI: 10.1111/cei.13342] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/13/2019] [Indexed: 01/07/2023] Open
Abstract
The role of suppressive anti-retroviral therapy (ART) in eliciting restoration of dysregulated immune function remains unclear in HIV-1 infection. Also, due to tailoring of therapeutic regimens towards HIV-1, this possible impairment of therapy may be even more pronounced in HIV-2 and dual (HIV-D) infection. Thus, we evaluated the impact of ART on immune restoration by assessing T cell functions, including HIV specific responses in HIV-1-, HIV-2- and HIV-D-infected individuals. Both ART-treated and naive infected subjects showed persistently altered frequency of CD4+ T cell subsets [regulatory T cells (Treg ), naive/central memory, effector memory], increased immune activation, cytoxicity and decreased frequency of natural killer T (NKT)- like cells and T helper type 17 (Th17)/Treg ratio with elevated microbial translocation. Further, HIV-specific responses were dominated by gag-specific CD4+ T cells in virologically suppressed HIV-D individuals, suggesting retention of T cell memory for both viruses. Increased antigen-specific responses, including dual-functional interleukin (IL)-2/interferon (IFN)-γ CD4+ T cells, were detected in therapy receiving HIV-2-infected individuals indicative of a greater and more functionally diverse T cell memory repertoire. We delineated immune signatures specific to therapy-naive single HIV infection, as well as a unique signature associated with HIV-2 disease progression and immune restoration. Circulating Treg frequency, T cell activation and microbial translocation levels correlated with disease progression and immune restoration among all types of HIV infection. Also, memory responses negatively correlated, irrespective of type of infection, in ART receiving infected individuals, with CD4 rebound and decreased pan T cell activation. Our data highlight the need for adjunct immunomodulatory therapeutic strategies to achieve optimal immune restoration in HIV infection.
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Affiliation(s)
- S. Salwe
- Department of Biochemistry and VirologyNational Institute for Research in Reproductive Health, Indian Council of Medical ResearchParelMumbaiIndia
| | - V. Padwal
- Department of Biochemistry and VirologyNational Institute for Research in Reproductive Health, Indian Council of Medical ResearchParelMumbaiIndia
| | - V. Nagar
- Department of MedicineGrant Medical College and Sir J. J. Group of HospitalsMumbaiIndia
| | - P. Patil
- Department of MedicineGrant Medical College and Sir J. J. Group of HospitalsMumbaiIndia
| | - V. Patel
- Department of Biochemistry and VirologyNational Institute for Research in Reproductive Health, Indian Council of Medical ResearchParelMumbaiIndia
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5
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Yu KKQ, Wilburn DB, Hackney JA, Darrah PA, Foulds KE, James CA, Smith MT, Jing L, Seder RA, Roederer M, Koelle DM, Swanson WJ, Seshadri C. Conservation of molecular and cellular phenotypes of invariant NKT cells between humans and non-human primates. Immunogenetics 2019; 71:465-478. [PMID: 31123763 PMCID: PMC6647187 DOI: 10.1007/s00251-019-01118-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 04/26/2019] [Accepted: 04/30/2019] [Indexed: 10/27/2022]
Abstract
Invariant NKT (iNKT) cells in both humans and non-human primates are activated by the glycolipid antigen, α-galactosylceramide (α-GalCer). However, the extent to which the molecular mechanisms of antigen recognition and in vivo phenotypes of iNKT cells are conserved among primate species has not been determined. Using an evolutionary genetic approach, we found a lack of diversifying selection in CD1 genes over 45 million years of evolution, which stands in stark contrast to the history of the MHC system for presenting peptide antigens to T cells. The invariant T cell receptor (TCR)-α chain was strictly conserved across all seven primate clades. Invariant NKT cells from rhesus macaques (Macaca mulatta) bind human CD1D-α-GalCer tetramer and are activated by α-GalCer-loaded human CD1D transfectants. The dominant TCR-β chain cloned from a rhesus-derived iNKT cell line is nearly identical to that found in the human iNKT TCR, and transduction of the rhesus iNKT TCR into human Jurkat cells show that it is sufficient for binding human CD1D-α-GalCer tetramer. Finally, we used a 20-color flow cytometry panel to probe tissue phenotypes of iNKT cells in a cohort of rhesus macaques. We discovered several tissue-resident iNKT populations that have not been previously described in non-human primates but are known in humans, such as TCR-γδ iNKTs. These data reveal a diversity of iNKT cell phenotypes despite convergent evolution of the genes required for lipid antigen presentation and recognition in humans and non-human primates.
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Affiliation(s)
- Krystle K Q Yu
- Department of Medicine, University of Washington, Seattle, WA, USA
| | - Damien B Wilburn
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Joshua A Hackney
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Patricia A Darrah
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Kathryn E Foulds
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Charlotte A James
- Department of Medicine, University of Washington, Seattle, WA, USA
- Department of Pathology, Molecular Medicine and Mechanisms of Disease Program, University of Washington, Seattle, WA, USA
| | - Malisa T Smith
- Department of Medicine, University of Washington, Seattle, WA, USA
| | - Lichen Jing
- Department of Medicine, University of Washington, Seattle, WA, USA
| | - Robert A Seder
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Mario Roederer
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - David M Koelle
- Department of Medicine, University of Washington, Seattle, WA, USA
- Department of Laboratory Medicine, University of Washington, Seattle, WA, USA
- Department of Global Health, University of Washington, Seattle, WA, USA
- Benaroya Research Institute, Seattle, WA, USA
- Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Willie J Swanson
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
| | - Chetan Seshadri
- Department of Medicine, University of Washington, Seattle, WA, USA.
- Tuberculosis Research & Training Center, University of Washington, Seattle, WA, USA.
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Schönrich G, Raftery MJ. CD1-Restricted T Cells During Persistent Virus Infections: "Sympathy for the Devil". Front Immunol 2018; 9:545. [PMID: 29616036 PMCID: PMC5868415 DOI: 10.3389/fimmu.2018.00545] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 03/02/2018] [Indexed: 12/12/2022] Open
Abstract
Some of the clinically most important viruses persist in the human host after acute infection. In this situation, the host immune system and the viral pathogen attempt to establish an equilibrium. At best, overt disease is avoided. This attempt may fail, however, resulting in eventual loss of viral control or inadequate immune regulation. Consequently, direct virus-induced tissue damage or immunopathology may occur. The cluster of differentiation 1 (CD1) family of non-classical major histocompatibility complex class I molecules are known to present hydrophobic, primarily lipid antigens. There is ample evidence that both CD1-dependent and CD1-independent mechanisms activate CD1-restricted T cells during persistent virus infections. Sophisticated viral mechanisms subvert these immune responses and help the pathogens to avoid clearance from the host organism. CD1-restricted T cells are not only crucial for the antiviral host defense but may also contribute to tissue damage. This review highlights the two edged role of CD1-restricted T cells in persistent virus infections and summarizes the viral immune evasion mechanisms that target these fascinating immune cells.
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Affiliation(s)
- Günther Schönrich
- Berlin Institute of Health, Institute of Virology, Charité-Universitätsmedizin Berlin, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Martin J Raftery
- Berlin Institute of Health, Institute of Virology, Charité-Universitätsmedizin Berlin, Humboldt-Universität zu Berlin, Berlin, Germany
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7
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CD1d-Restricted Natural Killer T Cells Are Preserved in Indian Long-Term Nonprogressors. J Acquir Immune Defic Syndr 2017. [PMID: 28650939 DOI: 10.1097/qai.0000000000001322] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Natural killer T (NKT) cells act as a bridge between innate and adaptive immune responses. Limited information is available regarding the role of NKT cells in the HIV disease progression especially HIV-1 C infection. METHODOLOGY NKT cells were characterized for their frequency and the activation, aging, exhaustion status, and their proliferation ability in 32 long-term nonprogressors (LTNPs), 40 progressors, 18 patients before and after suppressive combination antiretroviral therapy (cART) along with 35 HIV-1-negative subjects using multicolor flow cytometry. RESULTS The frequencies of total NKT cells and their subpopulation were significantly higher in LTNPs as compared with those obtained in progressors (P < 0.0001) and were significantly associated with higher CD4 counts and with lower plasma viral loads. The percentage of activated, aged, and exhausted NKT cells were significantly lower in LTNPs as compared with the progressors and inversely correlated with CD4 count and positively with plasma viral loads. The NKT cells from the LTNPs showed higher proliferation ability. The frequency and proliferation ability of the NKT cells were partially restored after 12 months of suppressive cART but still lower than the levels in LTNPs. The degree of restoration after cART was similar in both CD4 and CD4 NKT cells. CONCLUSION The findings demonstrate significant association of preserved NKT cells with the nonprogressive HIV infection and also showed that exhausted NKT cells are associated with disease progression. Further characterization of their functionality and assessment of sustenance in HIV infection will help to understand the HIV pathogenesis and to develop immune therapies.
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8
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Overgaard NH, Cruz JL, Bridge JA, Nel HJ, Frazer IH, La Gruta NL, Blumenthal A, Steptoe RJ, Wells JW. CD4 +CD8β + double-positive T cells in skin-draining lymph nodes respond to inflammatory signals from the skin. J Leukoc Biol 2017. [PMID: 28637895 DOI: 10.1189/jlb.1ab0217-065r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
CD4+CD8+ double-positive (DP), mature, peripheral T cells are readily detectable in a variety of species and tissues. Despite a common association with autoimmune and malignant skin disorders, however, little is understood about their role or function. Herein, we show that DP T cells are readily detectable in the blood, spleen, and peripheral lymph nodes of naïve C57BL/6 mice. DP T cells were also present in Jα18-/- and CD1d-/- mice, indicating that these cells are not NK-T cells. After skin administration of CASAC adjuvant, but not Quil A adjuvant, both total DP T cells and skin-infiltrating DP T cells increased in number. We explored the possibility that DP T cells could represent aggregates between CD4+ and CD8+ single-positive T cells and found strong evidence that a large proportion of apparent DP T cells were indeed aggregates. However, the existence of true CD4+CD8+ DP T cells was confirmed by Amnis ImageStream (Millipore Sigma, Billerica, MA, USA) imaging. Multiple rounds of FACS sorting separated true DP cells from aggregates and indicated that conventional analyses may lead to ∼10-fold overestimation of DP T cell numbers. The high degree of aggregate contamination and overestimation of DP abundance using conventional analysis techniques may explain discrepancies reported in the literature for DP T cell origin, phenotype, and function.
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Affiliation(s)
- Nana H Overgaard
- The University of Queensland Diamantina Institute, Faculty of Medicine, University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia.,Division of Immunology and Vaccinology, National Veterinary Institute, Technical University of Denmark, Copenhagen, Denmark; and
| | - Jazmina L Cruz
- The University of Queensland Diamantina Institute, Faculty of Medicine, University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia
| | - Jennifer A Bridge
- The University of Queensland Diamantina Institute, Faculty of Medicine, University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia
| | - Hendrik J Nel
- The University of Queensland Diamantina Institute, Faculty of Medicine, University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia
| | - Ian H Frazer
- The University of Queensland Diamantina Institute, Faculty of Medicine, University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia
| | - Nicole L La Gruta
- Department of Microbiology and Immunology, University of Melbourne, Melbourne, Australia
| | - Antje Blumenthal
- The University of Queensland Diamantina Institute, Faculty of Medicine, University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia
| | - Raymond J Steptoe
- The University of Queensland Diamantina Institute, Faculty of Medicine, University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia
| | - James W Wells
- The University of Queensland Diamantina Institute, Faculty of Medicine, University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia;
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9
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Littwitz-Salomon E, Schimmer S, Dittmer U. Natural killer T cells contribute to the control of acute retroviral infection. Retrovirology 2017; 14:5. [PMID: 28122574 PMCID: PMC5267384 DOI: 10.1186/s12977-017-0327-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Accepted: 01/03/2017] [Indexed: 01/12/2023] Open
Abstract
Background Natural killer T cells (NKT cells) play an important role in the immunity against viral infections. They produce cytokines or have direct cytolytic effects that can restrict virus replication. However, the exact function of NKT cells in retroviral immunity is not fully elucidated. Therefore, we analyzed the antiretroviral functions of NKT cells in mice infected with the Friend retrovirus (FV). Results After FV infection numbers of NKT cells remained unchanged but activation as well as improved effector functions of NKT cells were found. While the release of pro-inflammatory cytokines was not changed after infection, activated NKT cells revealed an elevated cytotoxic potential. Stimulation with α-Galactosylceramide significantly increased not only total NKT cell numbers and activation but also the anti-retroviral capacity of NKT cells. Conclusion We demonstrate a strong activation and a potent cytolytic function of NKT cells during acute retroviral infection. Therapeutic treatment with α-Galactosylceramide could further improve the reduction of early retroviral replication by NKT cells, which could be utilized for future treatment against viral infections. Electronic supplementary material The online version of this article (doi:10.1186/s12977-017-0327-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Elisabeth Littwitz-Salomon
- Institute for Virology of the University Hospital Essen, University of Duisburg-Essen, Hufelandstr. 55, 45147, Essen, Germany.
| | - Simone Schimmer
- Institute for Virology of the University Hospital Essen, University of Duisburg-Essen, Hufelandstr. 55, 45147, Essen, Germany
| | - Ulf Dittmer
- Institute for Virology of the University Hospital Essen, University of Duisburg-Essen, Hufelandstr. 55, 45147, Essen, Germany
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10
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Paquin-Proulx D, Ching C, Vujkovic-Cvijin I, Fadrosh D, Loh L, Huang Y, Somsouk M, Lynch SV, Hunt PW, Nixon DF, SenGupta D. Bacteroides are associated with GALT iNKT cell function and reduction of microbial translocation in HIV-1 infection. Mucosal Immunol 2017; 10:69-78. [PMID: 27049061 PMCID: PMC5053825 DOI: 10.1038/mi.2016.34] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 03/07/2016] [Indexed: 02/04/2023]
Abstract
Invariant natural killer T (iNKT) cells are innate-like T cells that respond to lipid antigens presented by CD1d. These immunoregulatory cells have the capacity for rapid cytokine release after antigen recognition and are essential for the activation of multiple arms of the immune response. HIV-1 infection is associated with iNKT cell depletion in the peripheral blood; however, their role in the gastrointestinal-associated lymphoid tissue (GALT) is less well studied. Our results show that iNKT cells are found at a higher frequency in GALT compared with blood, particularly in HIV-1 elite controllers. The capacity of iNKT cells to produce interleukin-4 (IL-4) and IL-10 in the GALT was associated with less immune activation and lower markers of microbial translocation, whereas regulatory T cell frequency showed positive associations with immune activation. We hypothesized that the composition of the microbiota would influence iNKT cell frequency and function. We found positive associations between the abundance of several Bacteroides species and iNKT cell frequency and their capacity to produce IL-4 in the GALT but not in the blood. Overall, our results are consistent with the hypothesis that GALT iNKT cells, influenced by certain bacterial species, may have a key role in regulating immune activation in HIV-1 infection.
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Affiliation(s)
- Dominic Paquin-Proulx
- Department of Microbiology, Immunology & Tropical Medicine,
The George Washington University, Washington, USA
| | - Christopher Ching
- Division of Experimental Medicine, Department of Medicine,
University of California, San Francisco, San Francisco, California, USA
| | - Ivan Vujkovic-Cvijin
- Division of Experimental Medicine, Department of Medicine,
University of California, San Francisco, San Francisco, California, USA
| | - Douglas Fadrosh
- Division of Gastroenterology, Department of Medicine, University of
California, San Francisco, San Francisco, California, USA
| | - Liyen Loh
- Division of Experimental Medicine, Department of Medicine,
University of California, San Francisco, San Francisco, California, USA
| | - Yong Huang
- Department of Bioengineering and Therapeutic Sciences, School of
Pharmacy University of California, San Francisco, California, USA
| | - Ma Somsouk
- Division of Gastroenterology, Department of Medicine, University of
California, San Francisco, San Francisco, California, USA
| | - Susan V. Lynch
- Division of Gastroenterology, Department of Medicine, University of
California, San Francisco, San Francisco, California, USA
| | - Peter W. Hunt
- HIV/AIDS Division, Department of Medicine, San Francisco General
Hospital, University of California, San Francisco, San Francisco, California,
USA
| | - Douglas F. Nixon
- Department of Microbiology, Immunology & Tropical Medicine,
The George Washington University, Washington, USA
| | - Devi SenGupta
- Division of Experimental Medicine, Department of Medicine,
University of California, San Francisco, San Francisco, California, USA
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11
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Huot N, Rascle P, Garcia-Tellez T, Jacquelin B, Müller-Trutwin M. Innate immune cell responses in non pathogenic versus pathogenic SIV infections. Curr Opin Virol 2016; 19:37-44. [PMID: 27447445 DOI: 10.1016/j.coviro.2016.06.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 06/16/2016] [Accepted: 06/24/2016] [Indexed: 02/06/2023]
Abstract
HIV-1/SIVmac infections deeply disturb innate host responses. Most studies have focused on the impact on dendritic cells and NK cells. A few but insufficient data are available on other innate immune cell types, such as neutrophils. It has been shown that innate lymphoid cells are depleted early and irreversibly during SIVmac/HIV-1 infections. Studies in natural hosts of SIV have contributed to pinpoint that early control of inflammation is crucial. In natural hosts, plasmacytoid dendritic cells, myeloid dendritic cells and NK cells are depleted during acute infection but return to normal levels by the end of acute infection. We summarize here the similarities and differences of various types of innate immune responses in natural hosts compared to pathogenic HIV/SIV mac infections.
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Affiliation(s)
- Nicolas Huot
- Institut Pasteur, Unité HIV, Inflammation and Persistence, Paris, France; CEA, Division of Immuno-Virology, iMETI, DSV, Fontenay-aux-Roses, France; Vaccine Research Institute, Créteil, France
| | - Philippe Rascle
- Institut Pasteur, Unité HIV, Inflammation and Persistence, Paris, France; Vaccine Research Institute, Créteil, France
| | | | - Beatrice Jacquelin
- Institut Pasteur, Unité HIV, Inflammation and Persistence, Paris, France
| | - Michaela Müller-Trutwin
- Institut Pasteur, Unité HIV, Inflammation and Persistence, Paris, France; Vaccine Research Institute, Créteil, France.
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12
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Gao Y, Williams AP. Role of Innate T Cells in Anti-Bacterial Immunity. Front Immunol 2015; 6:302. [PMID: 26124758 PMCID: PMC4463001 DOI: 10.3389/fimmu.2015.00302] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2015] [Accepted: 05/27/2015] [Indexed: 01/12/2023] Open
Abstract
Innate T cells are a heterogeneous group of αβ and γδ T cells that respond rapidly (<2 h) upon activation. These innate T cells also share a non MHC class I or II restriction requirement for antigen recognition. Three major populations within the innate T cell group are recognized, namely, invariant NKT cells, mucosal associated invariant T cells, and gamma delta T cells. These cells recognize foreign/self-lipid presented by non-classical MHC molecules, such as CD1d, MR1, and CD1a. They are activated during the early stages of bacterial infection and act as a bridge between the innate and adaptive immune systems. In this review, we focus on the functional properties of these three innate T cell populations and how they are purposed for antimicrobial defense. Furthermore, we address the mechanisms through which their effector functions are targeted for bacterial control and compare this in human and murine systems. Lastly, we speculate on future roles of these cell types in therapeutic settings such as vaccination.
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Affiliation(s)
- Yifang Gao
- Academic Unit of Cancer Sciences, Faculty of Medicine and Institute for Life Sciences, University of Southampton and NIHR Cancer Research UK Experimental Cancer Medicine Centre , Southampton , UK
| | - Anthony P Williams
- Academic Unit of Cancer Sciences, Faculty of Medicine and Institute for Life Sciences, University of Southampton and NIHR Cancer Research UK Experimental Cancer Medicine Centre , Southampton , UK ; Wessex Investigational Sciences Hub (WISH) Laboratory, Department of Allergy, Asthma and Clinical Immunology, University Hospital Southampton NHS Foundation Trust , Southampton , UK
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13
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Overgaard NH, Jung JW, Steptoe RJ, Wells JW. CD4+/CD8+ double-positive T cells: more than just a developmental stage? J Leukoc Biol 2014; 97:31-8. [PMID: 25360000 DOI: 10.1189/jlb.1ru0814-382] [Citation(s) in RCA: 180] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
CD4(+)/CD8(+) DP thymocytes are a well-described T cell developmental stage within the thymus. However, once differentiated, the CD4(+) lineage or the CD8(+) lineage is generally considered to be fixed. Nevertheless, mature CD4(+)/CD8(+) DP T cells have been described in the blood and peripheral lymphoid tissues of numerous species, as well as in numerous disease settings, including cancer. The expression of CD4 and CD8 is regulated by a very strict transcriptional program involving the transcription factors Runx3 and ThPOK. Initially thought to be mutually exclusive within CD4(+) and CD8(+) T cells, CD4(+)/CD8(+) T cell populations, outside of the thymus, have recently been described to express concurrently ThPOK and Runx3. Considerable heterogeneity exists within the CD4(+)/CD8(+) DP T cell pool, and the function of CD4(+)/CD8(+) T cell populations remains controversial, with conflicting reports describing cytotoxic or suppressive roles for these cells. In this review, we describe how transcriptional regulation, lineage of origin, heterogeneity of CD4 and CD8 expression, age, species, and specific disease settings influence the functionality of this rarely studied T cell population.
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Affiliation(s)
- Nana H Overgaard
- The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia; and Center for Cancer Immune Therapy, Department of Hematology, Copenhagen University Hospital, Herlev, Denmark
| | - Ji-Won Jung
- The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia; and
| | - Raymond J Steptoe
- The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia; and
| | - James W Wells
- The University of Queensland Diamantina Institute, The University of Queensland, Translational Research Institute, Brisbane, Queensland, Australia; and
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14
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Fernandez CS, Kelleher AD, Finlayson R, Godfrey DI, Kent SJ. NKT cell depletion in humans during early HIV infection. Immunol Cell Biol 2014; 92:578-90. [PMID: 24777308 DOI: 10.1038/icb.2014.25] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 03/06/2014] [Accepted: 03/08/2014] [Indexed: 12/19/2022]
Abstract
Natural killer T (NKT) cells bridge across innate and adaptive immune responses and have an important role in chronic viral infections such as human immunodeficiency virus (HIV). NKT cells are depleted during chronic HIV infection, but the timing, drivers and implications of this NKT cell depletion are poorly understood. We studied human peripheral blood NKT cell levels, phenotype and function in 31 HIV-infected subjects not on antiretroviral treatment from a mean of 4 months to 2 years after HIV infection. We found that peripheral CD4(+) NKT cells were substantially depleted and dysfunctional by 4 months after HIV infection. The depletion of CD4(+) NKT cells was more marked than the depletion of total CD4(+) T cells. Further, the early depletion of NKT cells correlated with CD4(+) T-cell decline, but not HIV viral levels. Levels of activated CD4(+) T cells correlated with the loss of NKT cells. Our studies suggest that the early loss of NKT cells is associated with subsequent immune destruction during HIV infection.
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Affiliation(s)
- Caroline S Fernandez
- Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia
| | - Anthony D Kelleher
- 1] Kirby Institute, University of New South Wales, Kensington, New South Wales, Australia [2] St Vincent's Centre for Applied Medical Research, Sydney, New South Wales, Australia
| | - Robert Finlayson
- Taylor Square Private Clinic, Darlinghurst, New South Wales, Australia
| | - Dale I Godfrey
- Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia
| | - Stephen J Kent
- Department of Microbiology and Immunology, University of Melbourne, Parkville, Victoria, Australia
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15
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Padte NN, Boente-Carrera M, Andrews CD, McManus J, Grasperge BF, Gettie A, Coelho-dos-Reis JG, Li X, Wu D, Bruder JT, Sedegah M, Patterson N, Richie TL, Wong CH, Ho DD, Vasan S, Tsuji M. A glycolipid adjuvant, 7DW8-5, enhances CD8+ T cell responses induced by an adenovirus-vectored malaria vaccine in non-human primates. PLoS One 2013; 8:e78407. [PMID: 24205224 PMCID: PMC3808339 DOI: 10.1371/journal.pone.0078407] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Accepted: 09/11/2013] [Indexed: 01/12/2023] Open
Abstract
A key strategy to a successful vaccine against malaria is to identify and develop new adjuvants that can enhance T-cell responses and improve protective immunity. Upon co-administration with a rodent malaria vaccine in mice, 7DW8-5, a recently identified novel analog of α-galactosylceramide (α-GalCer), enhances the level of malaria-specific protective immune responses more strongly than the parent compound. In this study, we sought to determine whether 7DW8-5 could provide a similar potent adjuvant effect on a candidate human malaria vaccine in the more relevant non-human primate (NHP) model, prior to committing to clinical development. The candidate human malaria vaccine, AdPfCA (NMRC-M3V-Ad-PfCA), consists of two non-replicating recombinant adenoviral (Ad) vectors, one expressing the circumsporozoite protein (CSP) and another expressing the apical membrane antigen-1 (AMA1) of Plasmodium falciparum. In several phase 1 clinical trials, AdPfCA was well tolerated and demonstrated immunogenicity for both humoral and cell-mediated responses. In the study described herein, 25 rhesus macaques received prime and boost intramuscular (IM) immunizations of AdPfCA alone or with an ascending dose of 7DW8-5. Our results indicate that 7DW8-5 is safe and well-tolerated and provides a significant enhancement (up to 9-fold) in malaria-specific CD8+ T-cell responses after both priming and boosting phases, supporting further clinical development.
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Affiliation(s)
- Neal N. Padte
- Aaron Diamond AIDS Research Center, Affiliate of The Rockefeller University, New York, New York, United States of America
| | - Mar Boente-Carrera
- Aaron Diamond AIDS Research Center, Affiliate of The Rockefeller University, New York, New York, United States of America
| | - Chasity D. Andrews
- Aaron Diamond AIDS Research Center, Affiliate of The Rockefeller University, New York, New York, United States of America
| | - Jenny McManus
- Aaron Diamond AIDS Research Center, Affiliate of The Rockefeller University, New York, New York, United States of America
| | - Brooke F. Grasperge
- Tulane National Primate Research Center, Tulane University Medical Center, Covington, Louisiana, United States of America
| | - Agegnehu Gettie
- Tulane National Primate Research Center, Tulane University Medical Center, Covington, Louisiana, United States of America
| | - Jordana G. Coelho-dos-Reis
- Aaron Diamond AIDS Research Center, Affiliate of The Rockefeller University, New York, New York, United States of America
| | - Xiangming Li
- Aaron Diamond AIDS Research Center, Affiliate of The Rockefeller University, New York, New York, United States of America
| | - Douglass Wu
- Department of Chemistry, the Scripps Research Institute, La Jolla, California, United States of America
| | - Joseph T. Bruder
- Research, GenVec, Inc., Gaithersburg, Maryland, United States of America
| | - Martha Sedegah
- US Military Malaria Vaccine Program, Naval Medical Research Center, Silver Spring, Maryland, United States of America
| | - Noelle Patterson
- US Military Malaria Vaccine Program, Naval Medical Research Center, Silver Spring, Maryland, United States of America
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Bethesda, Maryland, United States of America
| | - Thomas L. Richie
- US Military Malaria Vaccine Program, Naval Medical Research Center, Silver Spring, Maryland, United States of America
| | - Chi-Huey Wong
- Department of Chemistry, the Scripps Research Institute, La Jolla, California, United States of America
| | - David D. Ho
- Aaron Diamond AIDS Research Center, Affiliate of The Rockefeller University, New York, New York, United States of America
| | - Sandhya Vasan
- Aaron Diamond AIDS Research Center, Affiliate of The Rockefeller University, New York, New York, United States of America
- * E-mail: (SV); (MT)
| | - Moriya Tsuji
- Aaron Diamond AIDS Research Center, Affiliate of The Rockefeller University, New York, New York, United States of America
- * E-mail: (SV); (MT)
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16
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Fernandez CS, Jegaskanda S, Godfrey DI, Kent SJ. In-vivo stimulation of macaque natural killer T cells with α-galactosylceramide. Clin Exp Immunol 2013; 173:480-92. [PMID: 23656283 DOI: 10.1111/cei.12132] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/01/2013] [Indexed: 12/14/2022] Open
Abstract
Natural killer T cells are a potent mediator of anti-viral immunity in mice, but little is known about the effects of manipulating NKT cells in non-human primates. We evaluated the delivery of the NKT cell ligand, α-galactosylceramide (α-GalCer), in 27 macaques by studying the effects of different dosing (1-100 μg), and delivery modes [directly intravenously (i.v.) or pulsed onto blood or peripheral blood mononuclear cells]. We found that peripheral NKT cells were depleted transiently from the periphery following α-GalCer administration across all delivery modes, particularly in doses of ≥10 μg. Furthermore, NKT cell numbers frequently remained depressed at i.v. α-GalCer doses of >10 μg. Levels of cytokine expression were also not enhanced after α-GalCer delivery to macaques. To evaluate the effects of α-GalCer administration on anti-viral immunity, we administered α-GalCer either together with live attenuated influenza virus infection or prior to simian immunodeficiency virus (SIV) infection of two macaques. There was no clear enhancement of influenza-specific T or B cell immunity following α-GalCer delivery. Further, there was no modulation of pathogenic SIVmac251 infection following α-GalCer delivery to a further two macaques in a pilot study. Accordingly, although macaque peripheral NKT cells are modulated by α-GalCer in vivo, at least for the dosing regimens tested in this study, this does not appear to have a significant impact on anti-viral immunity in macaque models.
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Affiliation(s)
- C S Fernandez
- Department of Microbiology and Immunology, University of Melbourne, Parkville, Vic., Australia
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17
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Sandberg JK, Andersson SK, Bächle SM, Nixon DF, Moll M. HIV-1 Vpu interference with innate cell-mediated immune mechanisms. Curr HIV Res 2013; 10:327-33. [PMID: 22524181 PMCID: PMC3412205 DOI: 10.2174/157016212800792513] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2012] [Revised: 03/06/2012] [Accepted: 03/14/2012] [Indexed: 12/26/2022]
Abstract
The HIV-1 accessory protein Vpu is emerging as a viral factor with a range of activities devoted to counteracting host innate immunity. Here, we review recent findings concerning the role of Vpu in hampering activation of cellular immune responses mediated by CD1d-restricted invariant natural killer T (iNKT) cells and natural killer (NK) cells. The two key findings are that Vpu interferes with CD1d expression and antigen presentation, and also with expression of the NK cell activation ligand NK-T and B cell antigen (NTB-A). Both these activities are mechanistically distinct from CD4 and Tetherin (BST-2) down-modulation. We summarize the mechanistic insights gained into Vpu interference with CD1d and NTB-A, as well as important challenges going forward, and discuss these mechanisms in the context of the role that iNKT and NK cells play in HIV-1 immunity and immunopathogenesis.
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Affiliation(s)
- Johan K Sandberg
- Center for Infectious Medicine, Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden.
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18
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Ohashi M, Fogg MH, Orlova N, Quink C, Wang F. An Epstein-Barr virus encoded inhibitor of Colony Stimulating Factor-1 signaling is an important determinant for acute and persistent EBV infection. PLoS Pathog 2012; 8:e1003095. [PMID: 23300447 PMCID: PMC3531511 DOI: 10.1371/journal.ppat.1003095] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2012] [Accepted: 11/06/2012] [Indexed: 01/05/2023] Open
Abstract
Acute Epstein-Barr virus (EBV) infection is the most common cause of Infectious Mononucleosis. Nearly all adult humans harbor life-long, persistent EBV infection which can lead to development of cancers including Hodgkin Lymphoma, Burkitt Lymphoma, nasopharyngeal carcinoma, gastric carcinoma, and lymphomas in immunosuppressed patients. BARF1 is an EBV replication-associated, secreted protein that blocks Colony Stimulating Factor 1 (CSF-1) signaling, an innate immunity pathway not targeted by any other virus species. To evaluate effects of BARF1 in acute and persistent infection, we mutated the BARF1 homologue in the EBV-related herpesvirus, or lymphocryptovirus (LCV), naturally infecting rhesus macaques to create a recombinant rhLCV incapable of blocking CSF-1 (ΔrhBARF1). Rhesus macaques orally challenged with ΔrhBARF1 had decreased viral load indicating that CSF-1 is important for acute virus infection. Surprisingly, ΔrhBARF1 was also associated with dramatically lower virus setpoints during persistent infection. Normal acute viral load and normal viral setpoints during persistent rhLCV infection could be restored by Simian/Human Immunodeficiency Virus-induced immunosuppression prior to oral inoculation with ΔrhBARF1 or infection of immunocompetent animals with a recombinant rhLCV where the rhBARF1 was repaired. These results indicate that BARF1 blockade of CSF-1 signaling is an important immune evasion strategy for efficient acute EBV infection and a significant determinant for virus setpoint during persistent EBV infection. Epstein-Barr virus (EBV) is a herpesvirus that persistently infects nearly all humans by adulthood. Acute and persistent phases of EBV infection are associated with a variety of human diseases, including infectious mononucleosis and cancer. To investigate how EBV interacts with the host to successfully establish acute and persistent infection, we combined the power of the rhesus macaque animal model for EBV infection with genetic engineering of the EBV-related herpesvirus, or lymphocryptovirus (LCV), that naturally infects rhesus macaques. We created a recombinant rhLCV carrying a mutated EBV BARF1 homologue, a replication-associated viral protein that is secreted and blocks Colony Stimulating Factor-1 (CSF-1) signaling, a cytokine important for innate immunity. Oral inoculation of rhesus macaques showed that the virus' ability to block CSF-1 was important for achieving the normally high viral loads during acute infection, and surprisingly, was also needed to establish normal levels of virus infection, or viral setpoint, during persistent infection. These studies show that virus-mediated interruption of innate immunity is critical for both acute and persistent phases of EBV infection. Understanding how EBV successfully infects humans and how the natural history of EBV infection can be disrupted will aid in development of vaccines to prevent EBV-associated diseases.
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Affiliation(s)
- Makoto Ohashi
- Department of Medicine, Brigham & Women's Hospital and Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Mark H. Fogg
- Department of Medicine, Brigham & Women's Hospital and Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Nina Orlova
- Department of Medicine, Brigham & Women's Hospital and Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Carol Quink
- Department of Medicine, Brigham & Women's Hospital and Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Fred Wang
- Department of Medicine, Brigham & Women's Hospital and Department of Microbiology and Immunobiology, Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail:
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19
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Li X, Polacino P, Garcia-Navarro R, Hu SL, Tsuji M. Peripheral blood invariant natural killer T cells of pig-tailed macaques. PLoS One 2012; 7:e48166. [PMID: 23110202 PMCID: PMC3479117 DOI: 10.1371/journal.pone.0048166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2012] [Accepted: 09/21/2012] [Indexed: 11/26/2022] Open
Abstract
In humans, invariant natural killer T (iNKT) cells represent a small but significant population of peripheral blood mononuclear cells (PBMCs) with a high degree of variability. In this study, pursuant to our goal of identifying an appropriate non-human primate model suitable for pre-clinical glycolipid testing, we evaluated the percentage and function of iNKT cells in the peripheral blood of pig-tailed macaques. First, using a human CD1d-tetramer loaded with α-GalCer (α-GalCer-CD1d-Tet), we found that α-GalCer-CD1d-Tet+ CD3+iNKT cells make up 0.13% to 0.4% of pig-tailed macaque PBMCs, which are comparable to the percentage of iNKT cells found in human PBMCs. Second, we observed that a large proportion of Vα24+CD3+ cells are α-GalCer-CD1d-Tet+CD3+iNKT cells, which primarily consist of either the CD4+ or CD8+ subpopulation. Third, we found that pig-tailed macaque iNKT cells produce IFN-γ in response to α-GalCer, as shown by ELISpot assay and intracellular cytokine staining (ICCS), as well as TNF-α, as shown by ICCS, indicating that these iNKT cells are fully functional. Interestingly, the majority of pig-tailed macaque iNKT cells that secrete IFN-γ are CD8+iNKT cells. Based on these findings, we conclude that the pig-tailed macaques exhibit potential as a non-human animal model for the pre-clinical testing of iNKT-stimulating glycolipids.
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Affiliation(s)
- Xiangming Li
- HIV and Malaria Vaccine Program, Aaron Diamond AIDS Research Center, Affiliate of the Rockefeller University, New York, New York, United States of America
| | - Patricia Polacino
- Washington National Primate Research Center, University of Washington, Seattle, Washington, United States of America
| | - Raquel Garcia-Navarro
- HIV and Malaria Vaccine Program, Aaron Diamond AIDS Research Center, Affiliate of the Rockefeller University, New York, New York, United States of America
| | - Shiu-Lok Hu
- Washington National Primate Research Center, University of Washington, Seattle, Washington, United States of America
- Department of Pharmaceutics, University of Washington, Seattle, Washington, United States of America
| | - Moriya Tsuji
- HIV and Malaria Vaccine Program, Aaron Diamond AIDS Research Center, Affiliate of the Rockefeller University, New York, New York, United States of America
- * E-mail:
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20
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Rout N, Greene J, Yue S, O'Connor D, Johnson RP, Else JG, Exley MA, Kaur A. Loss of effector and anti-inflammatory natural killer T lymphocyte function in pathogenic simian immunodeficiency virus infection. PLoS Pathog 2012; 8:e1002928. [PMID: 23028326 PMCID: PMC3447755 DOI: 10.1371/journal.ppat.1002928] [Citation(s) in RCA: 25] [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: 05/11/2012] [Accepted: 08/13/2012] [Indexed: 11/29/2022] Open
Abstract
Chronic immune activation is a key determinant of AIDS progression in HIV-infected humans and simian immunodeficiency virus (SIV)-infected macaques but is singularly absent in SIV-infected natural hosts. To investigate whether natural killer T (NKT) lymphocytes contribute to the differential modulation of immune activation in AIDS-susceptible and AIDS-resistant hosts, we compared NKT function in macaques and sooty mangabeys in the absence and presence of SIV infection. Cynomolgus macaques had significantly higher frequencies of circulating invariant NKT lymphocytes compared to both rhesus macaques and AIDS-resistant sooty mangabeys. Despite this difference, mangabey NKT lymphocytes were functionally distinct from both macaque species in their ability to secrete significantly more IFN-γ, IL-13, and IL-17 in response to CD1d/α-galactosylceramide stimulation. While NKT number and function remained intact in SIV-infected mangabeys, there was a profound reduction in NKT activation-induced, but not mitogen-induced, secretion of IFN-γ, IL-2, IL-10, and TGF-β in SIV-infected macaques. SIV-infected macaques also showed a selective decline in CD4+ NKT lymphocytes which correlated significantly with an increase in circulating activated memory CD4+ T lymphocytes. Macaques with lower pre-infection NKT frequencies showed a significantly greater CD4+ T lymphocyte decline post SIV infection. The disparate effect of SIV infection on NKT function in mangabeys and macaques could be a manifestation of their differential susceptibility to AIDS. Alternately, these data also raise the possibility that loss of anti-inflammatory NKT function promotes chronic immune activation in pathogenic SIV infection, while intact NKT function helps to protect natural hosts from developing immunodeficiency and aberrant immune activation. Several African nonhuman primate species such as sooty mangabeys are naturally infected with SIV and maintain high levels of viral replication without developing AIDS. SIV-infected natural hosts do not show evidence of increased chronic immune activation, a feature that distinguishes them from AIDS-susceptible SIV-infected Asian macaques. In this study we compared natural killer T (NKT) lymphocytes, a unique subset of innate T lymphocytes with anti-inflammatory properties, in AIDS-resistant and AIDS-susceptible hosts. Sooty mangabey NKT cells retained normal functionality following SIV infection and were more potent than macaque NKT cells in their ability to produce interferon-γ and secrete anti-inflammatory cytokines. In contrast, NKT cells of SIV-infected macaques were markedly hypo-functional with regards to secretion of anti-inflammatory and effector cytokines and showed an association between loss of CD4+ NKT cells and increased immune activation. These findings suggest that dysfunctional NKT cells may promote increased immune activation in AIDS-susceptible hosts while intact effector and anti-inflammatory NKT cells could help to prevent immunodeficiency and increased immune activation in natural hosts.
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Affiliation(s)
- Namita Rout
- New England Primate Research Center, Harvard Medical School, Southborough, Massachusetts, USA
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21
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Abstract
Natural killer T cells (NKT cells) represent a subset of T lymphocytes that express natural killer (NK) cell surface markers. A subset of NKT cells, termed invariant NKT cells (iNKT), express a highly restricted T cell receptor (TCR) and respond to CD1d-restricted lipid ligands. iNKT cells are now appreciated to play an important role in linking innate and adaptive immune responses and have been implicated in infectious disease, allergy, asthma, autoimmunity, and tumor surveillance. Advances in iNKT identification and purification have allowed for the detailed study of iNKT activity in both humans and mice during a variety of chronic and acute infections. Comparison of iNKT function between non-pathogenic simian immunodeficiency virus (SIV) infection models and chronic HIV-infected patients implies a role for iNKT activity in controlling immune activation. In vitro studies of influenza infection have revealed novel effector functions of iNKT cells including IL-22 production and modulation of myeloid-derived suppressor cells, but ex vivo characterization of human iNKT cells during influenza infection are lacking. Similarly, as recent evidence suggests iNKT involvement in dengue virus pathogenesis, iNKT cells may modulate responses to a number of emerging pathogens. This Review will summarize current knowledge of iNKT involvement in responses to viral infections in both human and mouse models and will identify critical gaps in knowledge and opportunities for future study. We will also highlight recent efforts to harness iNKT ligands as vaccine adjuvants capable of improving vaccination-induced cellular immune responses.
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Affiliation(s)
- Jennifer A. Juno
- Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Yoav Keynan
- Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada
- Department of Community Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
- Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
- Department of Internal Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Keith R. Fowke
- Department of Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada
- Department of Community Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
- Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
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22
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Fernandez CS, Cameron G, Godfrey DI, Kent SJ. Ex-vivo α-galactosylceramide activation of NKT cells in humans and macaques. J Immunol Methods 2012; 382:150-9. [PMID: 22683545 DOI: 10.1016/j.jim.2012.05.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Revised: 05/18/2012] [Accepted: 05/30/2012] [Indexed: 01/08/2023]
Abstract
NKT cells are key mediators of antiviral and anticancer immunity. Experiments in mice have demonstrated that activation of NKT cells in vivo induces the expression of multiple effector molecules critical to successful immunity. Human clinical trials have shown similar responses, although in vivo activation of NKT cells in humans or primate models are far more limited in number and scope. Measuring ex vivo activation of NKT cells by the CD1d-restricted glycolipid ligand α-Galactosylceramide (α-GalCer) through cytokine expression profiles is a useful marker of NKT cell function, but for reasons that are unclear, this approach does not appear to work as well in humans and non-human primate macaque models in comparison to mice. We performed a series of experiments on human and macaque (Macaca nemestrina) fresh whole blood samples to define optimal conditions to detect NKT cell cytokine (TNF, IFNγ, IL-2) and degranulation marker (CD107a) expression by flow cytometry. We found that conditions previously described for mouse splenocyte NKT cell activation were suboptimal on human or macaque blood NKT cells. In contrast, a 6h incubation with brefeldin A added for the last 4h, in a 96-well plate based assay, and using an α-GalCer concentration of 1 μg/ml were optimal methods to stimulate NKT cells in fresh blood from both humans and macaques. Unexpectedly, we noted that blood NKT cells from macaques infected with SIV were more readily activated by α-GalCer than NKT cells from uninfected macaques, suggesting that SIV infection may have primed the NKT cells. In conclusion, we describe optimized methods for the ex vivo antigen-specific activation of human and macaque blood NKT cells. These assays should be useful in monitoring NKT cells in disease and in immunotherapy studies.
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Affiliation(s)
- Caroline S Fernandez
- Department of Microbiology and Immunology, University of Melbourne, Parkville, VIC 3010, Australia
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23
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Plaeger SF, Collins BS, Musib R, Deeks SG, Read S, Embry A. Immune activation in the pathogenesis of treated chronic HIV disease: a workshop summary. AIDS Res Hum Retroviruses 2012; 28:469-77. [PMID: 21854232 DOI: 10.1089/aid.2011.0213] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
With the advent of highly effective antiretroviral therapy (ART), infection with human immunodeficiency virus (HIV) has become a chronic disease rather than a death sentence. Nevertheless, effectively treated individuals have a higher than normal risk for developing noninfectious comorbidities, including cardiovascular and renal disease. Although traditional risk factors of aging as well as treatment toxicity contribute to this risk, many investigators consider chronic HIV-associated inflammation a significant factor in such end-organ disease. Despite effective viral suppression, chronic inflammation persists at levels higher than in uninfected people, yet the stimuli for the inflammation and the mechanism by which inflammation persists and promotes disease pathology remain incompletely understood. This critical gap in scientific understanding complicates and hampers effective decision making about appropriate medical intervention. To better understand the mechanism(s) of chronic immune activation in treated HIV disease, three questions need answers: (1) what is the cause of persistent immune activation during treated HIV infection, (2) what are the best surrogate markers of chronic immune activation in this setting, and (3) what therapeutic intervention(s) could prevent or reverse this process? The NIH sponsored and convened a meeting to discuss the state of knowledge concerning these questions and the best course for developing effective therapeutic strategies. This report summarizes the findings of that NIH meeting.
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Affiliation(s)
- Susan F. Plaeger
- Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland
| | - Brenda S. Collins
- Henry M. Jackson Foundation for the Advancement of Military Medicine, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland
| | - Runa Musib
- U.S. Military HIV Research Program, Henry M. Jackson Foundation for the Advancement of Military Medicine, Rockville, Maryland
| | - Steven G. Deeks
- University of California, San Francisco, San Francisco, California
| | - Sarah Read
- Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland
| | - Alan Embry
- Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland
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Nascimbeni M, Pol S, Saunier B. Distinct CD4+ CD8+ double-positive T cells in the blood and liver of patients during chronic hepatitis B and C. PLoS One 2011; 6:e20145. [PMID: 21647449 PMCID: PMC3102078 DOI: 10.1371/journal.pone.0020145] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2011] [Accepted: 04/19/2011] [Indexed: 01/10/2023] Open
Abstract
CD4+ and CD8+ T cells, the main effectors of adaptive cellular immune responses, differentiate from immature, non-functional CD4+CD8+ double-positive T (DPT) cells in the thymus. Increased proportions of circulating DPT lymphocytes have been observed during acute viral infections; in chronic viral diseases, the role and repartition of extra-thymic DPT cells remain largely uncharacterized. We performed a phenotypic analysis of DPT cells in blood and liver from patients chronically infected by hepatitis C (HCV) or B (HBV) viruses. The highest percentages of DPT cells, predominantly CD4highCD8low, were observed in patients infected by HCV, while HBV-infected patients mostly displayed CD4lowCD8high and CD4highCD8high DPT cells. All proportions of DPT cells were higher in liver than in blood with, for each subpopulation referred to above, a correlation between their frequencies in these two compartments. In HCV patients, intra-hepatic DPT cells displayed more heterogeneous activation, differentiation and memory phenotypes than in the blood; most of them expressed CD1a, a marker of T cell development in the thymus. Ex vivo, the inoculation of liver slices with HCV produced in cell culture was accompanied by a disappearance of CD8high cells, suggesting a direct effect of the virus on the phenotype of DPT cells in the liver. Our results suggest that, in half of the patients, chronic HCV infection promotes the production of DPT cells, perhaps by their re-induction in the thymus and selection in the liver.
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Affiliation(s)
- Michelina Nascimbeni
- Faculty of Medicine, Paris-Descartes University, Paris, France
- Institut Cochin, UMR8104 of the Centre National de la Recherche Scientific (CNRS), Paris, France
- U1016 of the Institut National de la Santé et de la Recherche Médicale (Inserm), Paris, France
| | - Stanislas Pol
- Faculty of Medicine, Paris-Descartes University, Paris, France
- Institut Cochin, UMR8104 of the Centre National de la Recherche Scientific (CNRS), Paris, France
- U1016 of the Institut National de la Santé et de la Recherche Médicale (Inserm), Paris, France
- Hepatology Unit of Cochin Hospital, Assistance Publique-Hôpitaux de Paris (AP-HP), Paris, France
| | - Bertrand Saunier
- Faculty of Medicine, Paris-Descartes University, Paris, France
- Institut Cochin, UMR8104 of the Centre National de la Recherche Scientific (CNRS), Paris, France
- U1016 of the Institut National de la Santé et de la Recherche Médicale (Inserm), Paris, France
- * E-mail:
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Mureithi MW, Cohen K, Moodley R, Poole D, Mncube Z, Kasmar A, Moody DB, Goulder PJ, Walker BD, Altfeld M, Ndung'u T. Impairment of CD1d-restricted natural killer T cells in chronic HIV type 1 clade C infection. AIDS Res Hum Retroviruses 2011; 27:501-9. [PMID: 20942750 DOI: 10.1089/aid.2010.0237] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Recent studies suggest that natural killer T (NKT) cells play a role in early antiviral pathogenesis and are rapidly depleted in chronic human immunodeficiency virus type 1 (HIV-1) clade B infection. We aimed to characterize the phenotypic and functional characteristics of NKT cells in HIV-1 clade C-infected Africans at different stages of HIV-1 disease. NKT cell frequencies, subsets, and ex vivo effector functions were assessed using multiparametric flow cytometry in a cross-sectional analysis of cryopreserved peripheral blood mononuclear cells from a cohort of 53 HIV-1 clade C chronically infected South African adults with CD4 T cell counts ranging from 94 to 839 cells/μl. We observed a significant decline of NKT cell numbers in advanced HIV-1 disease as well as activation and functional impairment of NKT cells in individuals with low CD4 T cell counts. The loss of NKT cells was largely driven by a reduction in the CD4(+) and CD4(-)CD8(-) NKT cell subsets in advanced disease. These findings demonstrate significant impairment of the NKT cell compartment in progressive HIV-1 clade C disease that might play an important role in the modulation of immune function in HIV-1 infection.
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Affiliation(s)
- Marianne W. Mureithi
- HIV Pathogenesis Programme, Doris Duke Medical Research Institute and KwaZulu-Natal Research Institute for TB and HIV (K-RITH), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
- Ragon Institute of MGH, MIT, and Harvard, Charlestown, Massachusetts
| | - Kristen Cohen
- Ragon Institute of MGH, MIT, and Harvard, Charlestown, Massachusetts
| | - Ramona Moodley
- HIV Pathogenesis Programme, Doris Duke Medical Research Institute and KwaZulu-Natal Research Institute for TB and HIV (K-RITH), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Danielle Poole
- HIV Pathogenesis Programme, Doris Duke Medical Research Institute and KwaZulu-Natal Research Institute for TB and HIV (K-RITH), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
- Ragon Institute of MGH, MIT, and Harvard, Charlestown, Massachusetts
| | - Zenele Mncube
- HIV Pathogenesis Programme, Doris Duke Medical Research Institute and KwaZulu-Natal Research Institute for TB and HIV (K-RITH), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
| | - Anne Kasmar
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - D. Branch Moody
- Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts
| | - Philip J.R. Goulder
- HIV Pathogenesis Programme, Doris Duke Medical Research Institute and KwaZulu-Natal Research Institute for TB and HIV (K-RITH), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
- Department of Pediatrics, Peter Medawar Building for Pathogen Research, University of Oxford, Oxford, United Kingdom
| | - Bruce D. Walker
- HIV Pathogenesis Programme, Doris Duke Medical Research Institute and KwaZulu-Natal Research Institute for TB and HIV (K-RITH), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
- Ragon Institute of MGH, MIT, and Harvard, Charlestown, Massachusetts
- Howard Hughes Medical Institute, Chevy Chase, Maryland
| | - Marcus Altfeld
- HIV Pathogenesis Programme, Doris Duke Medical Research Institute and KwaZulu-Natal Research Institute for TB and HIV (K-RITH), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
- Ragon Institute of MGH, MIT, and Harvard, Charlestown, Massachusetts
| | - Thumbi Ndung'u
- HIV Pathogenesis Programme, Doris Duke Medical Research Institute and KwaZulu-Natal Research Institute for TB and HIV (K-RITH), Nelson R. Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
- Ragon Institute of MGH, MIT, and Harvard, Charlestown, Massachusetts
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Rout N, Else JG, Yue S, Connole M, Exley MA, Kaur A. Heterogeneity in phenotype and function of CD8+ and CD4/CD8 double-negative Natural Killer T cell subsets in sooty mangabeys. J Med Primatol 2010; 39:224-34. [PMID: 20618588 DOI: 10.1111/j.1600-0684.2010.00431.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND We have recently reported the presence of CD8(+) and CD4/8 double-negative (DN) natural killer T (NKT) lymphocytes in sooty mangabeys. To investigate differences in the two NKT cell subsets, we compared the phenotype and function of sooty mangabey CD8(+) and DN NKT cells. METHODS Flow-sorted NKT lymphocytes from one SIV-negative sooty mangabey were subjected to limiting dilution cloning. Invariant NKT clones were characterized by flow cytometry and cytokine ELISA. RESULTS The majority of NKT clones displayed an effector memory phenotype and expressed CXCR3 and NKG2D. While CD8(+) NKT subsets expressed significantly higher levels of granzyme B and perforin and produced more IFN-gamma, the DN NKT subsets secreted significantly more IL-4, IL-13, and IL-10. CONCLUSIONS The Th1 and Th2 cytokine bias of CD8(+) and DN NKT cells, respectively, indicates the presence of functionally heterogeneous populations of NKT cells in sooty mangabeys.
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Affiliation(s)
- Namita Rout
- New England Primate Research Center, Harvard Medical School, Southborough, MA, USA
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Borrow P, Shattock RJ, Vyakarnam A. Innate immunity against HIV: a priority target for HIV prevention research. Retrovirology 2010; 7:84. [PMID: 20937128 PMCID: PMC2964587 DOI: 10.1186/1742-4690-7-84] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2010] [Accepted: 10/11/2010] [Indexed: 12/21/2022] Open
Abstract
This review summarizes recent advances and current gaps in understanding of innate immunity to human immunodeficiency virus (HIV) infection, and identifies key scientific priorities to enable application of this knowledge to the development of novel prevention strategies (vaccines and microbicides). It builds on productive discussion and new data arising out of a workshop on innate immunity against HIV held at the European Commission in Brussels, together with recent observations from the literature. Increasing evidence suggests that innate responses are key determinants of the outcome of HIV infection, influencing critical events in the earliest stages of infection including the efficiency of mucosal HIV transmission, establishment of initial foci of infection and local virus replication/spread as well as virus dissemination, the ensuing acute burst of viral replication, and the persisting viral load established. They also impact on the subsequent level of ongoing viral replication and rate of disease progression. Modulation of innate immunity thus has the potential to constitute a powerful effector strategy to complement traditional approaches to HIV prophylaxis and therapy. Importantly, there is increasing evidence to suggest that many arms of the innate response play both protective and pathogenic roles in HIV infection. Consequently, understanding the contributions made by components of the host innate response to HIV acquisition/spread versus control is a critical pre-requisite for the employment of innate immunity in vaccine or microbicide design, so that appropriate responses can be targeted for up- or down-modulation. There is also an important need to understand the mechanisms via which innate responses are triggered and mediate their activity, and to define the structure-function relationships of individual innate factors, so that they can be selectively exploited or inhibited. Finally, strategies for achieving modulation of innate functions need to be developed and subjected to rigorous testing to ensure that they achieve the desired level of protection without stimulation of immunopathological effects. Priority areas are identified where there are opportunities to accelerate the translation of recent gains in understanding of innate immunity into the design of improved or novel vaccine and microbicide strategies against HIV infection.
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Affiliation(s)
- Persephone Borrow
- Nuffield Department of Clinical Medicine, University of Oxford, The Jenner Institute, Compton, Newbury, Berkshire, UK.
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Rout N, Else JG, Yue S, Connole M, Exley MA, Kaur A. Paucity of CD4+ natural killer T (NKT) lymphocytes in sooty mangabeys is associated with lack of NKT cell depletion after SIV infection. PLoS One 2010; 5:e9787. [PMID: 20352088 PMCID: PMC2844411 DOI: 10.1371/journal.pone.0009787] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2010] [Accepted: 03/02/2010] [Indexed: 12/22/2022] Open
Abstract
Lack of chronic immune activation in the presence of persistent viremia is a key feature that distinguishes nonpathogenic simian immunodeficiency virus (SIV) infection in natural hosts from pathogenic SIV and HIV infection. To elucidate novel mechanisms downmodulating immune activation in natural hosts of SIV infection, we investigated natural killer T (NKT) lymphocytes in sooty mangabeys. NKT lymphocytes are a potent immunoregulatory arm of the innate immune system that recognize glycolipid antigens presented on the nonpolymorphic MHC-class I-like CD1d molecules. In a cross-sectional analysis of 50 SIV-negative and 50 naturally SIV-infected sooty mangabeys, ligand alpha-galactosylceramide loaded CD1d tetramers co-staining with Valpha24-positive invariant NKT lymphocytes were detected at frequencies >or=0.002% of circulating T lymphocytes in approximately half of the animals. In contrast to published reports in Asian macaques, sooty mangabey NKT lymphocytes consisted of CD8(+) and CD4/CD8 double-negative T lymphocytes that were CXCR3-positive and CCR5-negative suggesting that they trafficked to sites of inflammation without being susceptible to SIV infection. Consistent with these findings, there was no difference in the frequency or phenotype of NKT lymphocytes between SIV-negative and SIV-infected sooty mangabeys. On stimulation with alpha-galactosylceramide loaded on human CD1d molecules, sooty mangabey NKT lymphocytes underwent degranulation and secreted IFN-gamma, TNF-alpha, IL-2, IL-13, and IL-10, indicating the presence of both effector and immunoregulatory functional capabilities. The unique absence of CD4(+) NKT lymphocytes in sooty mangabeys, combined with their IL-10 cytokine-secreting ability and preservation following SIV infection, raises the possibility that NKT lymphocytes might play a role in downmodulating immune activation in SIV-infected sooty mangabeys.
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Affiliation(s)
- Namita Rout
- New England Primate Research Center, Harvard Medical School, Southborough, Massachusetts, United States of America
| | - James G. Else
- Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America
| | - Simon Yue
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Michelle Connole
- New England Primate Research Center, Harvard Medical School, Southborough, Massachusetts, United States of America
| | - Mark A. Exley
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Amitinder Kaur
- New England Primate Research Center, Harvard Medical School, Southborough, Massachusetts, United States of America
- * E-mail:
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Abstract
NKT cells are innate-like T lymphocytes that are found in rodents and primates. They are non-conventional T cells restricted by the CD1d molecule that presents self and exogenous glycolipids. NKT cells are unique in their ability to promptly secrete copious amounts of cytokines such as IFN-gamma and IL-4. Once activated, NKT cells can provide maturation signals to downstream cells, including DC, NK cells, and lymphocytes, thereby contributing to both innate and acquired immunity. Accordingly, NKT cells can influence a wide array of immune responses, including tumor surveillance, maintenance of self-tolerance and anti-infectious defenses. Studies performed with NKT-cell-deficient mice have shown that these cells are critical for the clearance of various pathogens. During bacterial infections, NKT cells can be activated either indirectly by DC or directly by bacterial lipid antigens presented by CD1d. Although viruses do not contain lipid antigens, NKT cells have also been implicated in antiviral responses. The capacity of NKT cells to regulate viral immune-surveillance, either constitutively or post-activation, makes them an attractive clinical target. In this review, we summarize recent publications dealing with the functions and relevance of NKT cells in the context of viral infections, both in murine models and in humans.
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Affiliation(s)
- Julien Diana
- INSERM, U561, Hôpital Cochin/St. Vincent de Paul, Université Paris Descartes, Paris, France
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A double-edged sword: the role of NKT cells in malaria and HIV infection and immunity. Semin Immunol 2009; 22:87-96. [PMID: 19962909 DOI: 10.1016/j.smim.2009.11.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Revised: 11/02/2009] [Accepted: 11/09/2009] [Indexed: 02/08/2023]
Abstract
NKT cells are known to play a role against certain microbial infections, including malaria and HIV, two major global infectious diseases. NKT cells exhibit either protective or pathogenic role against malaria. They are depleted by HIV infection and have a direct pathogenic role against many opportunistic infections common in end-stage AIDS. This review discusses the various features of the interaction between NKT cells and malaria parasites and HIV, and the potential to harness this interaction for therapeutic and vaccine strategies.
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