1
|
Grossman Z. Immunological Paradigms, Mechanisms, and Models: Conceptual Understanding Is a Prerequisite to Effective Modeling. Front Immunol 2019; 10:2522. [PMID: 31749803 PMCID: PMC6848063 DOI: 10.3389/fimmu.2019.02522] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Accepted: 10/10/2019] [Indexed: 12/18/2022] Open
Abstract
Most mathematical models that describe the individual or collective actions of cells aim at creating faithful representations of limited sets of data in a self-consistent manner. Consistency with relevant physiological rules pertaining to the greater picture is rarely imposed. By themselves, such models have limited predictive or even explanatory value, contrary to standard claims. Here I try to show that a more critical examination of currently held paradigms is necessary and could potentially lead to models that pass the test of time. In considering the evolution of paradigms over the past decades I focus on the “smart surveillance” theory of how T cells can respond differentially, individually and collectively, to both self- and foreign antigens depending on various “contextual” parameters. The overall perspective is that physiological messages to cells are encoded not only in the biochemical connections of signaling molecules to the cellular machinery but also in the magnitude, kinetics, and in the time- and space-contingencies, of sets of stimuli. By rationalizing the feasibility of subthreshold interactions, the “dynamic tuning hypothesis,” a central component of the theory, set the ground for further theoretical and experimental explorations of dynamically regulated immune tolerance, homeostasis and diversity, and of the notion that lymphocytes participate in nonclassical physiological functions. Some of these efforts are reviewed. Another focus of this review is the concomitant regulation of immune activation and homeostasis through the operation of a feedback mechanism controlling the balance between renewal and differentiation of activated cells. Different perspectives on the nature and regulation of chronic immune activation in HIV infection have led to conflicting models of HIV pathogenesis—a major area of research for theoretical immunologists over almost three decades—and can have profound impact on ongoing HIV cure strategies. Altogether, this critical review is intended to constructively influence the outlook of prospective model builders and of interested immunologists on the state of the art and to encourage conceptual work.
Collapse
Affiliation(s)
- Zvi Grossman
- Vaccine Research Center, National Institute of Allergy and Infectious Diseases, NIH, Bethesda, MD, United States.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| |
Collapse
|
2
|
Nganou-Makamdop K, Billingsley JM, Yaffe Z, O’Connor G, Tharp GK, Ransier A, Laboune F, Matus-Nicodemos R, Lerner A, Gharu L, Robertson JM, Ford ML, Schlapschy M, Kuhn N, Lensch A, Lifson J, Nason M, Skerra A, Schreiber G, Bosinger SE, Douek DC. Type I IFN signaling blockade by a PASylated antagonist during chronic SIV infection suppresses specific inflammatory pathways but does not alter T cell activation or virus replication. PLoS Pathog 2018; 14:e1007246. [PMID: 30142226 PMCID: PMC6126880 DOI: 10.1371/journal.ppat.1007246] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 09/06/2018] [Accepted: 07/27/2018] [Indexed: 01/29/2023] Open
Abstract
Chronic activation of the immune system in HIV infection is one of the strongest predictors of morbidity and mortality. As such, approaches that reduce immune activation have received considerable interest. Previously, we demonstrated that administration of a type I interferon receptor antagonist (IFN-1ant) during acute SIV infection of rhesus macaques results in increased virus replication and accelerated disease progression. Here, we administered a long half-life PASylated IFN-1ant to ART-treated and ART-naïve macaques during chronic SIV infection and measured expression of interferon stimulated genes (ISG) by RNA sequencing, plasma viremia, plasma cytokines, T cell activation and exhaustion as well as cell-associated virus in CD4 T cell subsets sorted from peripheral blood and lymph nodes. Our study shows that IFN-1ant administration in both ART-suppressed and ART-untreated chronically SIV-infected animals successfully results in reduction of IFN-I-mediated inflammation as defined by reduced expression of ISGs but had no effect on plasma levels of IL-1β, IL-1ra, IL-6 and IL-8. Unlike in acute SIV infection, we observed no significant increase in plasma viremia up to 25 weeks after IFN-1ant administration or up to 15 weeks after ART interruption. Likewise, cell-associated virus measured by SIV gag DNA copies was similar between IFN-1ant and placebo groups. In addition, evaluation of T cell activation and exhaustion by surface expression of CD38, HLA-DR, Ki67, LAG-3, PD-1 and TIGIT, as well as transcriptome analysis showed no effect of IFN-I blockade. Thus, our data show that blocking IFN-I signaling during chronic SIV infection suppresses IFN-I-related inflammatory pathways without increasing virus replication, and thus may constitute a safe therapeutic intervention in chronic HIV infection.
Collapse
Affiliation(s)
- Krystelle Nganou-Makamdop
- Human Immunology Section, Vaccine Research Center, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland, United States of America
| | - James M. Billingsley
- Division of Microbiology and Immunology, Emory Vaccine Center, Yerkes National Primate Research Center, Atlanta, Georgia, United States of America
| | - Zachary Yaffe
- Human Immunology Section, Vaccine Research Center, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Gregory O’Connor
- Human Immunology Section, Vaccine Research Center, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Gregory K. Tharp
- Division of Microbiology and Immunology, Emory Vaccine Center, Yerkes National Primate Research Center, Atlanta, Georgia, United States of America
| | - Amy Ransier
- Human Immunology Section, Vaccine Research Center, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Farida Laboune
- Human Immunology Section, Vaccine Research Center, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Rodrigo Matus-Nicodemos
- Human Immunology Section, Vaccine Research Center, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Andrea Lerner
- Human Immunology Section, Vaccine Research Center, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Lavina Gharu
- Human Immunology Section, Vaccine Research Center, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Jennifer M. Robertson
- Department of Surgery and Emory Transplant Center, Emory University School of Medicine and Emory Healthcare, Atlanta, GA
| | - Mandy L. Ford
- Department of Surgery and Emory Transplant Center, Emory University School of Medicine and Emory Healthcare, Atlanta, GA
| | - Martin Schlapschy
- Lehrstuhl für Biologische Chemie, Technische Universität München, Freising (Weihenstephan), Germany
| | - Nadine Kuhn
- Lehrstuhl für Biologische Chemie, Technische Universität München, Freising (Weihenstephan), Germany
| | - Alexandra Lensch
- Lehrstuhl für Biologische Chemie, Technische Universität München, Freising (Weihenstephan), Germany
| | - Jeffrey Lifson
- AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, Frederick, Maryland, United States of America
| | - Martha Nason
- Biostatistics Research Branch, Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Arne Skerra
- Lehrstuhl für Biologische Chemie, Technische Universität München, Freising (Weihenstephan), Germany
- XL-protein GmbH, Freising, Germany
| | - Gideon Schreiber
- Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Steven E. Bosinger
- Division of Microbiology and Immunology, Emory Vaccine Center, Yerkes National Primate Research Center, Atlanta, Georgia, United States of America
- Department of Pathology & Laboratory Medicine, Emory University, Atlanta, Georgia, United States of America
| | - Daniel C. Douek
- Human Immunology Section, Vaccine Research Center, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, Maryland, United States of America
| |
Collapse
|
3
|
CXCL10/CXCR3-Dependent Mobilization of Herpes Simplex Virus-Specific CD8 + T EM and CD8 + T RM Cells within Infected Tissues Allows Efficient Protection against Recurrent Herpesvirus Infection and Disease. J Virol 2017; 91:JVI.00278-17. [PMID: 28468883 DOI: 10.1128/jvi.00278-17] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 04/25/2017] [Indexed: 12/22/2022] Open
Abstract
Herpes simplex virus 1 (HSV-1) establishes latency within the sensory neurons of the trigeminal ganglia (TG). HSV-specific memory CD8+ T cells play a critical role in preventing HSV-1 reactivation from TG and subsequent virus shedding in tears that trigger recurrent corneal herpetic disease. The CXC chemokine ligand 10 (CXCL10)/CXC chemokine receptor 3 (CXCR3) chemokine pathway promotes T cell immunity to many viral pathogens, but its importance in CD8+ T cell immunity to recurrent herpes has been poorly elucidated. In this study, we determined how the CXCL10/CXCR3 pathway affects TG- and cornea-resident CD8+ T cell responses to recurrent ocular herpesvirus infection and disease using a well-established murine model in which HSV-1 reactivation was induced from latently infected TG by UV-B light. Following UV-B-induced HSV-1 reactivation, a significant increase in both the number and function of HSV-specific CXCR3+ CD8+ T cells was detected in TG and corneas of protected C57BL/6 (B6) mice, but not in TG and corneas of nonprotected CXCL10-/- or CXCR3-/- deficient mice. This increase was associated with a significant reduction in both virus shedding and recurrent corneal herpetic disease. Furthermore, delivery of exogenous CXCL10 chemokine in TG of CXCL10-/- mice, using the neurotropic adeno-associated virus type 8 (AAV8) vector, boosted the number and function of effector memory CD8+ T cells (TEM) and tissue-resident memory CD8+ T cells (TRM), but not of central memory CD8+ T cells (TCM), locally within TG, and improved protection against recurrent herpesvirus infection and disease in CXCL10-/- deficient mice. These findings demonstrate that the CXCL10/CXCR3 chemokine pathway is critical in shaping CD8+ T cell immunity, locally within latently infected tissues, which protects against recurrent herpesvirus infection and disease.IMPORTANCE We determined how the CXCL10/CXCR3 pathway affects CD8+ T cell responses to recurrent ocular herpesvirus infection and disease. Using a well-established murine model, in which HSV-1 reactivation in latently infected trigeminal ganglia was induced by UV-B light, we demonstrated that lack of either CXCL10 chemokine or its CXCR3 receptor compromised the mobilization of functional CD8+ TEM and CD8+ TRM cells within latently infected trigeminal ganglia following virus reactivation. This lack of T cell mobilization was associated with an increase in recurrent ocular herpesvirus infection and disease. Inversely, augmenting the amount of CXCL10 in trigeminal ganglia of latently infected CXCL10-deficient mice significantly restored the number of local antiviral CD8+ TEM and CD8+ TRM cells associated with protection against recurrent ocular herpes. Based on these findings, a novel "prime/pull" therapeutic ocular herpes vaccine strategy is proposed and discussed.
Collapse
|
4
|
DeGottardi MQ, Okoye AA, Vaidya M, Talla A, Konfe AL, Reyes MD, Clock JA, Duell DM, Legasse AW, Sabnis A, Park BS, Axthelm MK, Estes JD, Reiman KA, Sekaly RP, Picker LJ. Effect of Anti-IL-15 Administration on T Cell and NK Cell Homeostasis in Rhesus Macaques. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2016; 197:1183-98. [PMID: 27430715 PMCID: PMC4976006 DOI: 10.4049/jimmunol.1600065] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 06/15/2016] [Indexed: 02/06/2023]
Abstract
IL-15 has been implicated as a key regulator of T and NK cell homeostasis in multiple systems; however, its specific role in maintaining peripheral T and NK cell populations relative to other γ-chain (γc) cytokines has not been fully defined in primates. In this article, we address this question by determining the effect of IL-15 inhibition with a rhesusized anti-IL-15 mAb on T and NK cell dynamics in rhesus macaques. Strikingly, anti-IL-15 treatment resulted in rapid depletion of NK cells and both CD4(+) and CD8(+) effector memory T cells (TEM) in blood and tissues, with little to no effect on naive or central memory T cells. Importantly, whereas depletion of NK cells was nearly complete and maintained as long as anti-IL-15 treatment was given, TEM depletion was countered by the onset of massive TEM proliferation, which almost completely restored circulating TEM numbers. Tissue TEM, however, remained significantly reduced, and most TEM maintained very high turnover throughout anti-IL-15 treatment. In the presence of IL-15 inhibition, TEM became increasingly more sensitive to IL-7 stimulation in vivo, and transcriptional analysis of TEM in IL-15-inhibited monkeys revealed engagement of the JAK/STAT signaling pathway, suggesting alternative γc cytokine signaling may support TEM homeostasis in the absence of IL-15. Thus, IL-15 plays a major role in peripheral maintenance of NK cells and TEM However, whereas most NK cell populations collapse in the absence of IL-15, TEM can be maintained in the face of IL-15 inhibition by the activity of other homeostatic regulators, most likely IL-7.
Collapse
Affiliation(s)
- Maren Q DeGottardi
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Afam A Okoye
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Mukta Vaidya
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Aarthi Talla
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106
| | - Audrie L Konfe
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Matthew D Reyes
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Joseph A Clock
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Derick M Duell
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Alfred W Legasse
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Amit Sabnis
- Department of Pathology, Case Western Reserve University, Cleveland, OH 44106
| | - Byung S Park
- Division of Biostatistics, Department of Public Health and Preventative Medicine, Oregon Health & Science University, Portland, OR 97239
| | - Michael K Axthelm
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Jacob D Estes
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Inc., Frederick National Laboratory, Frederick, MD 21702; and
| | - Keith A Reiman
- MassBiologics, University of Massachusetts Medical School, Boston, MA 02126
| | | | - Louis J Picker
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006; Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006;
| |
Collapse
|
5
|
Manoussaka MS, Berry N, Ferguson D, Stebbings R, Robinson M, Ham C, Page M, Li B, Das AT, Berkhout B, Almond N, Cranage MP. Conditionally-live attenuated SIV upregulates global T effector memory cell frequency under replication permissive conditions. Retrovirology 2013; 10:59. [PMID: 23738926 PMCID: PMC3706341 DOI: 10.1186/1742-4690-10-59] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 05/26/2013] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Live attenuated SIV induces potent protection against superinfection with virulent virus; however the mechanism of this vaccine effect is poorly understood. Such knowledge is important for the development of clinically acceptable vaccine modalities against HIV. RESULTS Using a novel, doxycycline dependent, replication-competent live-attenuated SIVmac239Δnef (SIV-rtTAΔnef), we show that under replication-permissive conditions SIV-rtTAΔnef is fully viable. Twelve rhesus macaques were infected with a peak plasma vRNA on average two log10 lower than in 6 macaques infected with unconditionally replication-competent SIVΔnef. Consistent with the attenuated phenotype of the viruses the majority of animals displayed low or undetectable levels of viraemia by 42-84 days after infection. Next, comparison of circulating T cells before and after chronic infection with parental SIVΔnef revealed a profound global polarisation toward CD28-CCR7- T-effector memory 2 (TEM2) cells within CD95+CD4+ and CD95+CD8+ populations. Critically, a similar effect was seen in the CD95+ CD4+ population and to somewhat lesser extent in the CD95+ CD8+ population of SIV-rtTAΔnef chronically infected macaques that were maintained on doxycycline, but was not seen in animals from which doxycycline had been withdrawn. The proportions of gut-homing T-central memory (TCM) and TEM defined by the expression of α4β7 and CD95 and differential expression of CD28 were increased in CD4 and CD8 cells under replication competent conditions and gut-homing CD4 TCM were also significantly increased under non-permissive conditions. TEM2 polarisation was seen in the small intestines of animals under replication permissive conditions but the effect was less pronounced than in the circulation. Intracellular cytokine staining of circulating SIV-specific T cells for IL-2, IFN-γ, TNF-α and IL-17 showed that the extent of polyfunctionality in CD4 and CD8 T cells was associated with replication permissivity; however, signature patterns of cytokine combinations were not distinguishable between groups of macaques. CONCLUSION Taken together our results show that the global T memory cell compartment is profoundly skewed towards a mature effector phenotype by attenuated SIV. Results with the replication-conditional mutant suggest that maintenance of this effect, that may be important in vaccine design, might require persistence of replicating virus.
Collapse
|
6
|
Mumbauer A, Gettie A, Blanchard J, Cheng-Mayer C. Efficient mucosal transmissibility but limited pathogenicity of R5 SHIV SF162P3N in Chinese-origin rhesus macaques. J Acquir Immune Defic Syndr 2013; 62:496-504. [PMID: 23221980 PMCID: PMC3622143 DOI: 10.1097/qai.0b013e31827f1c11] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Infection of rhesus macaques (RMs) of Indian origin with simian immunodeficiency virus or simian-HIV (SHIV) provided powerful tools to study HIV-1 transmission and disease and for testing the efficacy of novel drugs, vaccines, and prevention strategies. In developing alternative nonhuman primate AIDS models for the CCR5 (R5)-tropic SHIVSF162P3N, we characterized virus transmission and infection in Chinese-origin RMs. METHODS Virologic, immunologic, and pathogenic evaluations of R5 SHIVSF162P3N infection in Chinese RMs challenged intrarectally (ir) or intravaginally were performed and compared with those previously observed in Indian-origin rhesus exposed to the same inoculum dose and via similar route. RESULTS R5 SHIVSF162P3N transmits efficiently across mucosal surfaces in Chinese RMs. The magnitude and kinetics of early virus dissemination after ir inoculation in the Chinese macaques were similar to those observed in Indian rhesus, but a trend toward increased SHIVSF162P3N vaginal infectivity and rapid virus spread was seen in the Chinese macaques compared with the Indian-origin animals. Once infected, however, set point viremia in the ir- and intravaginal-infected Chinese rhesus was significantly lower and the animals survived longer compared with infected Indian rhesus. CONCLUSIONS The R5 SHIVSF162P3N/Chinese RM infection model is suitable for studies of mucosal HIV-1 transmission and protection, but the high frequency of spontaneous control of chronic viremia and reduced virulence with SHIVSF162P3N in this macaque subspecies may limit its utility in studying HIV-1 pathogenesis and in evaluating vaccines and antiretrovirals that rely on reduction in chronic viral load or AIDS development as an experimental end point.
Collapse
|
7
|
Fukazawa Y, Park H, Cameron MJ, Lefebvre F, Lum R, Coombes N, Mahyari E, Hagen S, Bae JY, Reyes MD, Swanson T, Legasse AW, Sylwester A, Hansen SG, Smith AT, Stafova P, Shoemaker R, Li Y, Oswald K, Axthelm MK, McDermott A, Ferrari G, Montefiori DC, Edlefsen PT, Piatak M, Lifson JD, Sékaly RP, Picker LJ. Lymph node T cell responses predict the efficacy of live attenuated SIV vaccines. Nat Med 2012; 18:1673-81. [PMID: 22961108 PMCID: PMC3493820 DOI: 10.1038/nm.2934] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 08/13/2012] [Indexed: 02/07/2023]
Abstract
Live attenuated simian immunodeficiency virus (SIV) vaccines (LAVs) remain the most efficacious of all vaccines in nonhuman primate models of HIV and AIDS, yet the basis of their robust protection remains poorly understood. Here we show that the degree of LAV-mediated protection against intravenous wild-type SIVmac239 challenge strongly correlates with the magnitude and function of SIV-specific, effector-differentiated T cells in the lymph node but not with the responses of such T cells in the blood or with other cellular, humoral and innate immune parameters. We found that maintenance of protective T cell responses is associated with persistent LAV replication in the lymph node, which occurs almost exclusively in follicular helper T cells. Thus, effective LAVs maintain lymphoid tissue-based, effector-differentiated, SIV-specific T cells that intercept and suppress early wild-type SIV amplification and, if present in sufficient frequencies, can completely control and perhaps clear infection, an observation that provides a rationale for the development of safe, persistent vectors that can elicit and maintain such responses.
Collapse
Affiliation(s)
- Yoshinori Fukazawa
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Haesun Park
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Mark J. Cameron
- Vaccine and Gene Therapy Institute-Florida, Port St. Lucie, FL 34987
| | - Francois Lefebvre
- Vaccine and Gene Therapy Institute-Florida, Port St. Lucie, FL 34987
| | - Richard Lum
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Noel Coombes
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Eisa Mahyari
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Shoko Hagen
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Jin Young Bae
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Marcelo Delos Reyes
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Tonya Swanson
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Alfred W. Legasse
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Andrew Sylwester
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Scott G. Hansen
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Andrew T. Smith
- Vaccine and Gene Therapy Institute-Florida, Port St. Lucie, FL 34987
| | - Petra Stafova
- Vaccine and Gene Therapy Institute-Florida, Port St. Lucie, FL 34987
| | - Rebecca Shoemaker
- AIDS and Cancer Virus Program, SAIC Frederick, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Yuan Li
- AIDS and Cancer Virus Program, SAIC Frederick, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Kelli Oswald
- AIDS and Cancer Virus Program, SAIC Frederick, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Michael K. Axthelm
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Adrian McDermott
- Vaccine Research Institute, National Institute of Allergy and Infectious Diseases, Bethesda, MD 20892
| | | | | | - Paul T. Edlefsen
- Statistical Center for HIV/AIDS Research and Prevention, Vaccine and Infectious Disease Division,, Fred Hutchinson Cancer Research Center, Seattle, WA 98109
| | - Michael Piatak
- AIDS and Cancer Virus Program, SAIC Frederick, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Jeffrey D. Lifson
- AIDS and Cancer Virus Program, SAIC Frederick, Inc., Frederick National Laboratory for Cancer Research, Frederick, MD 21702
| | - Rafick P. Sékaly
- Vaccine and Gene Therapy Institute-Florida, Port St. Lucie, FL 34987
| | - Louis J. Picker
- Vaccine and Gene Therapy Institute, Departments of Molecular Microbiology and Immunology and Pathology, and the Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| |
Collapse
|
8
|
Masopust D, Picker LJ. Hidden memories: frontline memory T cells and early pathogen interception. THE JOURNAL OF IMMUNOLOGY 2012; 188:5811-7. [PMID: 22675215 DOI: 10.4049/jimmunol.1102695] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Immunologic memory reflects the ability of a host to more effectively respond to a re-encounter with a particular pathogen than the first encounter, and when a vaccine mimics the first encounter, comprises the basis of vaccine efficacy. For T cells, memory is often equated with the anamnestic response, the ability of secondary lymphoid tissue-based (central) memory T cells to respond to pathogen exposure with a more rapid and higher magnitude production and infection-site delivery of pathogen-specific effector cells than observed in naive hosts. However, increasing evidence supports a fundamentally different kind of T cell memory in which differentiated, long-lived effector memory T cells, prepositioned in sites of potential pathogen invasion or rapidly mobilized to such sites from blood and marginated pools, intercept and potentially control/eliminate pathogen within hours of infection. In this article, we review the evidence for this "hidden" T cell memory and its implication for vaccine development.
Collapse
Affiliation(s)
- David Masopust
- Department of Microbiology, Center for Immunology, University of Minnesota, Minneapolis, MN 55455, USA
| | | |
Collapse
|
9
|
Okoye AA, Rohankhedkar M, Abana C, Pattenn A, Reyes M, Pexton C, Lum R, Sylwester A, Planer SL, Legasse A, Park BS, Piatak M, Lifson JD, Axthelm MK, Picker LJ. Naive T cells are dispensable for memory CD4+ T cell homeostasis in progressive simian immunodeficiency virus infection. J Exp Med 2012; 209:641-51. [PMID: 22451717 PMCID: PMC3328373 DOI: 10.1084/jem.20112071] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 02/21/2012] [Indexed: 11/04/2022] Open
Abstract
The development of AIDS in chronic HIV/simian immunodeficiency virus (SIV) infection has been closely linked to progressive failure of CD4(+) memory T cell (T(M)) homeostasis. CD4(+) naive T cells (T(N)) also decline in these infections, but their contribution to disease progression is less clear. We assessed the role of CD4(+) T(N) in SIV pathogenesis using rhesus macaques (RMs) selectively and permanently depleted of CD4(+) T(N) before SIV infection. CD4(+) T(N)-depleted and CD4(+) T(N)-repleted RMs were created by subjecting juvenile RMs to thymectomy versus sham surgery, respectively, followed by total CD4(+) T cell depletion and recovery from this depletion. Although thymectomized and sham-treated RMs manifested comparable CD4(+) T(M) recovery, only sham-treated RMs reconstituted CD4(+) T(N). CD4(+) T(N)-depleted RMs responded to SIVmac239 infection with markedly attenuated SIV-specific CD4(+) T cell responses, delayed SIVenv-specific Ab responses, and reduced SIV-specific CD8(+) T cell responses. However, CD4(+) T(N)-depleted and -repleted groups showed similar levels of SIV replication. Moreover, CD4(+) T(N) deficiency had no significant effect on CD4(+) T(M) homeostasis (either on or off anti-retroviral therapy) or disease progression. These data demonstrate that the CD4(+) T(N) compartment is dispensable for CD4(+) T(M) homeostasis in progressive SIV infection, and they confirm that CD4(+) T(M) comprise a homeostatically independent compartment that is intrinsically capable of self-renewal.
Collapse
Affiliation(s)
- Afam A. Okoye
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Mukta Rohankhedkar
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Chike Abana
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Audrie Pattenn
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Matthew Reyes
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Christopher Pexton
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Richard Lum
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Andrew Sylwester
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Shannon L. Planer
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Alfred Legasse
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Byung S. Park
- Division of Biostatistics, Department of Public Health and Preventive Medicine, Oregon Health & Science University, Portland, OR 97239
| | - Michael Piatak
- AIDS Vaccine Program, SAIC Frederick, Inc., National Cancer Institute-Frederick, Frederick, MD 21702
| | - Jeffrey D. Lifson
- AIDS Vaccine Program, SAIC Frederick, Inc., National Cancer Institute-Frederick, Frederick, MD 21702
| | - Michael K. Axthelm
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| | - Louis J. Picker
- Vaccine and Gene Therapy Institute, Departments of Pathology and Molecular Microbiology and Immunology, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, OR 97006
| |
Collapse
|
10
|
Younes SA, Punkosdy G, Caucheteux S, Chen T, Grossman Z, Paul WE. Memory phenotype CD4 T cells undergoing rapid, nonburst-like, cytokine-driven proliferation can be distinguished from antigen-experienced memory cells. PLoS Biol 2011; 9:e1001171. [PMID: 22022231 PMCID: PMC3191130 DOI: 10.1371/journal.pbio.1001171] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2011] [Accepted: 08/30/2011] [Indexed: 11/24/2022] Open
Abstract
Contrary to the current paradigm that nearly all memory T cells proliferate in response to antigenic stimulation, this paper shows that an important population of CD4 T lymphocytes achieves memory/effector status independent of antigenic stimulation. Memory phenotype (CD44bright, CD25negative) CD4 spleen and lymph node T cells (MP cells) proliferate rapidly in normal or germ-free donors, with BrdU uptake rates of 6% to 10% per day and Ki-67 positivity of 18% to 35%. The rapid proliferation of MP cells stands in contrast to the much slower proliferation of lymphocytic choriomeningitis virus (LCMV)-specific memory cells that divide at rates ranging from <1% to 2% per day over the period from 15 to 60 days after LCMV infection. Anti-MHC class II antibodies fail to inhibit the in situ proliferation of MP cells, implying a non–T-cell receptor (TCR)-driven proliferation. Such proliferation is partially inhibited by anti–IL-7Rα antibody. The sequence diversity of TCRβ CDR3 gene segments is comparable among the proliferating and quiescent MP cells from conventional and germ-free mice, implying that the majority of proliferating MP cells have not recently derived from a small cohort of cells that expand through multiple continuous rounds of cell division. We propose that MP cells constitute a diverse cell population, containing a subpopulation of slowly dividing authentic antigen-primed memory cells and a majority population of rapidly proliferating cells that did not arise from naïve cells through conventional antigen-driven clonal expansion. The class of immune cells called CD4 T lymphocytes consists of two major cell types: naïve cells that have not yet participated in an immune response and memory cells, which are cells that have responded to antigen, expanded in number, and acquired new characteristics. These two cell types can be distinguished from one another because they display different cell surface marker proteins. In this paper, we argue that many—probably most—of the cells researchers generally characterize as memory cells on the basis of their surface markers are not authentic memory cells. True memory cells—the ones produced, for example, when we immunize a child against a disease—divide very slowly, whereas the bulk of the cells we generally characterize as memory cells divide very rapidly. Mice that have never been exposed to antigens have as many of these “memory-like” cells as normal mice have, implying that these cells arise by a process that does not require foreign antigen. Analysis of the sequence of the antigen recognition receptors on these “memory-like” cells indicates that their replication does not derive from a few cells or clones undergoing multiple rounds of proliferation, thus their division cannot be explained by conventional, antigen-driven clonal expansion. We conclude that this large population of “memory-like” cells has arisen by a mechanism independent of a response to foreign antigen, and that these cells may have a crucial biological function.
Collapse
Affiliation(s)
- Souheil-Antoine Younes
- Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - George Punkosdy
- Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Stephane Caucheteux
- Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Tao Chen
- Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Zvi Grossman
- Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - William E. Paul
- Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail:
| |
Collapse
|
11
|
Abstract
HIV-1 and its simian counterpart SIV have been exquisitely tailored by evolution to evade host immunity. By virtue of specific adaptations that thwart individual innate or adaptive immune mechanisms, and an overall replication strategy that provides for rapid establishment of a large, systemic viral population, capable of dynamic adaptation to almost all immune selection pressures, these viruses, once established, almost invariably stay one step ahead of the host's immune system, and in the vast majority of infected individuals, replicate indefinitely. Although many vaccine approaches tested to date have been able to enhance the magnitude of the immune responses to HIV/SIV infection, most of these responses, whether cellular or humoral, have largely failed to be both effectively antiviral and targeted to prevent the emergence of fully functional escape variants. Recent advances, however, have provided strong evidence that the initial stages of infection following mucosal transmission of these viruses are more vulnerable to immune intervention, and have led to the development of vaccine strategies that elicit responses able to effectively intervene in these early stages of infection, either preventing acquisition of infection or establishing early, stringent, and durable control. Here, we place HIV/AIDS vaccine development in the context of the basic immunobiology of HIV and SIV, review the evidence for their vulnerability to immune responses immediately after mucosal transmission, and discuss how this newly recognized vulnerability might be exploited for the development of an effective HIV/AIDS vaccine.
Collapse
Affiliation(s)
- Louis J Picker
- Vaccine and Gene Therapy Institute, Department of Molecular Microbiology, Oregon Health & Science University, Beaverton, Oregon 97006, USA.
| | | | | |
Collapse
|
12
|
Greene JM, Wiseman RW, Lank SM, Bimber BN, Karl JA, Burwitz BJ, Lhost JJ, Hawkins OE, Kunstman KJ, Broman KW, Wolinsky SM, Hildebrand WH, O'Connor DH. Differential MHC class I expression in distinct leukocyte subsets. BMC Immunol 2011; 12:39. [PMID: 21762519 PMCID: PMC3155488 DOI: 10.1186/1471-2172-12-39] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Accepted: 07/15/2011] [Indexed: 11/16/2022] Open
Abstract
Background MHC class I proteins are partly responsible for shaping the magnitude and focus of the adaptive cellular immune response. In humans, conventional wisdom suggests that the HLA-A, -B, and -C alleles are equally expressed on the majority of cell types. While we currently have a thorough understanding of how total MHC class I expression varies in different tissues, it has been difficult to examine expression of single MHC class I alleles due to the homogeneity of MHC class I sequences. It is unclear how cDNA species are expressed in distinct cell subsets in humans and particularly in macaques which transcribe upwards of 20 distinct MHC class I alleles at variable levels. Results We examined MHC gene expression in human and macaque leukocyte subsets. In humans, while we detected overall differences in locus transcription, we found that transcription of MHC class I genes was consistent across the leukocyte subsets we studied with only small differences detected. In contrast, transcription of certain MHC cDNA species in macaques varied dramatically by up to 45% between different subsets. Although the Mafa-B*134:02 RNA is virtually undetectable in CD4+ T cells, it represents over 45% of class I transcripts in CD14+ monocytes. We observed parallel MHC transcription differences in rhesus macaques. Finally, we analyzed expression of select MHC proteins at the cell surface using fluorescent peptides. This technique confirmed results from the transcriptional analysis and demonstrated that other MHC proteins, known to restrict SIV-specific responses, are also differentially expressed among distinct leukocyte subsets. Conclusions We assessed MHC class I transcription and expression in human and macaque leukocyte subsets. Until now, it has been difficult to examine MHC class I allele expression due to the similarity of MHC class I sequences. Using two novel techniques we showed that expression varies among distinct leukocyte subsets of macaques but does not vary dramatically in the human cell subsets we examined. These findings suggest pathogen tropism may have a profound impact on the shape and focus of the MHC class I restricted CD8+ T cell response in macaques.
Collapse
Affiliation(s)
- Justin M Greene
- Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, 53706 Wisconsin, USA
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Schmitz JE, Zahn RC, Brown CR, Rett MD, Li M, Tang H, Pryputniewicz S, Byrum RA, Kaur A, Montefiori DC, Allan JS, Goldstein S, Hirsch VM. Inhibition of adaptive immune responses leads to a fatal clinical outcome in SIV-infected pigtailed macaques but not vervet African green monkeys. PLoS Pathog 2009; 5:e1000691. [PMID: 20011508 PMCID: PMC2785481 DOI: 10.1371/journal.ppat.1000691] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Accepted: 11/12/2009] [Indexed: 11/24/2022] Open
Abstract
African green monkeys (AGM) and other natural hosts for simian immunodeficiency virus (SIV) do not develop an AIDS-like disease following SIV infection. To evaluate differences in the role of SIV-specific adaptive immune responses between natural and nonnatural hosts, we used SIVagmVer90 to infect vervet AGM and pigtailed macaques (PTM). This infection results in robust viral replication in both vervet AGM and pigtailed macaques (PTM) but only induces AIDS in the latter species. We delayed the development of adaptive immune responses through combined administration of anti-CD8 and anti-CD20 lymphocyte-depleting antibodies during primary infection of PTM (n = 4) and AGM (n = 4), and compared these animals to historical controls infected with the same virus. Lymphocyte depletion resulted in a 1-log increase in primary viremia and a 4-log increase in post-acute viremia in PTM. Three of the four PTM had to be euthanized within 6 weeks of inoculation due to massive CMV reactivation and disease. In contrast, all four lymphocyte-depleted AGM remained healthy. The lymphocyte-depleted AGM showed only a trend toward a prolongation in peak viremia but the groups were indistinguishable during chronic infection. These data show that adaptive immune responses are critical for controlling disease progression in pathogenic SIV infection in PTM. However, the maintenance of a disease-free course of SIV infection in AGM likely depends on a number of mechanisms including non-adaptive immune mechanisms. Simian immunodeficiency virus (SIV) is a naturally occurring infection in a wide range of African nonhuman primates, including African green monkeys (AGM), which generally results in a clinically inapparent infection. In contrast, SIV infection of Asian nonhuman primates such as macaques can result in an AIDS-like disease similar to that observed in humans infected with human immunodeficiency virus (HIV). This different pathogenic outcome occurs despite similar levels of viremia. In order to evaluate the contribution of adaptive immune responses to these different outcomes, we transiently inhibited the generation of CD8+ and CD20+ lymphocyte-mediated immune responses in vervet AGM and pigtailed macaques (PTM) during primary SIV infection. PTM experienced higher viremia and accelerated progression to disease, whereas AGM showed only a short prolongation of peak viremia but exhibited no signs of illness. These results demonstrate that protection against development of disease in AGM does not solely rely on adaptive immune responses. Future efforts should aim to determine the underlying mechanisms that enable natural hosts to cope with SIV infection and to apply these findings to develop new treatment modalities for humans infected with HIV.
Collapse
Affiliation(s)
- Jörn E. Schmitz
- Division of Viral Pathogenesis, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail: (JES); (VMH)
| | - Roland C. Zahn
- Division of Viral Pathogenesis, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Charles R. Brown
- Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Maryland, United States of America
| | - Melisa D. Rett
- Division of Viral Pathogenesis, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
| | - Ming Li
- Laboratory for AIDS Vaccine Research and Development, Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Haili Tang
- Laboratory for AIDS Vaccine Research and Development, Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Sarah Pryputniewicz
- Division of Immunology, New England Primate Research Center, Southborough, Massachusetts, United States of America
| | - Russell A. Byrum
- Division of Clinical Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Amitinder Kaur
- Division of Immunology, New England Primate Research Center, Southborough, Massachusetts, United States of America
| | - David C. Montefiori
- Laboratory for AIDS Vaccine Research and Development, Department of Surgery, Duke University Medical Center, Durham, North Carolina, United States of America
| | - Jonathan S. Allan
- Department of Virology and Immunology, Southwest Foundation for Biomedical Research, San Antonio, Texas, United States of America
| | - Simoy Goldstein
- Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Maryland, United States of America
| | - Vanessa M. Hirsch
- Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Maryland, United States of America
- * E-mail: (JES); (VMH)
| |
Collapse
|
14
|
Okoye A, Park H, Rohankhedkar M, Coyne-Johnson L, Lum R, Walker JM, Planer SL, Legasse AW, Sylwester AW, Piatak M, Lifson JD, Sodora DL, Villinger F, Axthelm MK, Schmitz JE, Picker LJ. Profound CD4+/CCR5+ T cell expansion is induced by CD8+ lymphocyte depletion but does not account for accelerated SIV pathogenesis. ACTA ACUST UNITED AC 2009; 206:1575-88. [PMID: 19546246 PMCID: PMC2715089 DOI: 10.1084/jem.20090356] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Depletion of CD8+ lymphocytes during acute simian immunodeficiency virus (SIV) infection of rhesus macaques (RMs) results in irreversible prolongation of peak-level viral replication and rapid disease progression, consistent with a major role for CD8+ lymphocytes in determining postacute-phase viral replication set points. However, we report that CD8+ lymphocyte depletion is also associated with a dramatic induction of proliferation among CD4+ effector memory T (TEM) cells and, to a lesser extent, transitional memory T (TTrM) cells, raising the question of whether an increased availability of optimal (activated/proliferating), CD4+/CCR5+ SIV “target” cells contributes to this accelerated pathogenesis. In keeping with this, depletion of CD8+ lymphocytes in SIV− RMs led to a sustained increase in the number of potential CD4+ SIV targets, whereas such depletion in acute SIV infection led to increased target cell consumption. However, we found that the excess CD4+ TEM cell proliferation of CD8+ lymphocyte–depleted, acutely SIV-infected RMs was completely inhibited by interleukin (IL)-15 neutralization, and that this inhibition did not abrogate the rapidly progressive infection in these RMs. Moreover, although administration of IL-15 during acute infection induced robust CD4+ TEM and TTrM cell proliferation, it did not recapitulate the viral dynamics of CD8+ lymphocyte depletion. These data suggest that CD8+ lymphocyte function has a larger impact on the outcome of acute SIV infection than the number and/or activation status of target cells available for infection and viral production.
Collapse
Affiliation(s)
- Afam Okoye
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, OR 97006, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Hansen SG, Vieville C, Whizin N, Coyne-Johnson L, Siess DC, Drummond DD, Legasse AW, Axthelm MK, Oswald K, Trubey CM, Piatak M, Lifson JD, Nelson JA, Jarvis MA, Picker LJ. Effector memory T cell responses are associated with protection of rhesus monkeys from mucosal simian immunodeficiency virus challenge. Nat Med 2009; 15:293-9. [PMID: 19219024 PMCID: PMC2720091 DOI: 10.1038/nm.1935] [Citation(s) in RCA: 566] [Impact Index Per Article: 37.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Accepted: 01/21/2009] [Indexed: 01/08/2023]
Abstract
The rapid onset of massive, systemic viral replication during primary HIV or simian immunodeficiency virus (SIV) infection and the immune evasion capabilities of these viruses pose fundamental problems for vaccines that depend upon initial viral replication to stimulate effector T cell expansion and differentiation. We hypothesized that vaccines designed to maintain differentiated effector memory T cell (TEM cell) responses at viral entry sites might improve efficacy by impairing viral replication at its earliest stage, and we have therefore developed SIV protein-encoding vectors based on rhesus cytomegalovirus (RhCMV), the prototypical inducer of life-long TEM cell responses. RhCMV vectors expressing SIV Gag, Rev-Tat-Nef and Env persistently infected rhesus macaques, regardless of preexisting RhCMV immunity, and primed and maintained robust, SIV-specific CD4+ and CD8+ TEM cell responses (characterized by coordinate tumor necrosis factor, interferon-gamma and macrophage inflammatory protein-1beta expression, cytotoxic degranulation and accumulation at extralymphoid sites) in the absence of neutralizing antibodies. Compared to control rhesus macaques, these vaccinated rhesus macaques showed increased resistance to acquisition of progressive SIVmac239 infection upon repeated limiting-dose intrarectal challenge, including four macaques who controlled rectal mucosal infection without progressive systemic dissemination. These data suggest a new paradigm for AIDS vaccine development--vaccines capable of generating and maintaining HIV-specific TEM cells might decrease the incidence of HIV acquisition after sexual exposure.
Collapse
Affiliation(s)
- Scott G Hansen
- Vaccine and Gene Therapy Institute, Department of Molecular Microbiology, and the Oregon National Primate Research Center, Oregon Health & Science University, 505 Northwest 185th Avenue, Beaverton, Oregon 97006, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Why is HIV a pathogen? Trends Microbiol 2008; 16:555-60. [DOI: 10.1016/j.tim.2008.09.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2008] [Revised: 09/24/2008] [Accepted: 09/25/2008] [Indexed: 11/19/2022]
|