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Seoane PI, Taylor-Smith LM, Stirling D, Bell LCK, Noursadeghi M, Bailey D, May RC. Viral infection triggers interferon-induced expulsion of live Cryptococcus neoformans by macrophages. PLoS Pathog 2020; 16:e1008240. [PMID: 32106253 PMCID: PMC7046190 DOI: 10.1371/journal.ppat.1008240] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 11/25/2019] [Indexed: 11/19/2022] Open
Abstract
Cryptococcus neoformans is an opportunistic human pathogen, which causes serious disease in immunocompromised hosts. Infection with this pathogen is particularly relevant in HIV+ patients, where it leads to around 200,000 deaths per annum. A key feature of cryptococcal pathogenesis is the ability of the fungus to survive and replicate within the phagosome of macrophages, as well as its ability to be expelled from host cells via a novel non-lytic mechanism known as vomocytosis. Here we show that cryptococcal vomocytosis from macrophages is strongly enhanced by viral coinfection, without altering phagocytosis or intracellular proliferation of the fungus. This effect occurs with distinct, unrelated human viral pathogens and is recapitulated when macrophages are stimulated with the anti-viral cytokines interferon alpha or beta (IFNα or IFNβ). Importantly, the effect is abrogated when type-I interferon signalling is blocked, thus underscoring the importance of type-I interferons in this phenomenon. Lastly, our data help resolve previous, contradictory animal studies on the impact of type I interferons on cryptococcal pathogenesis and suggest that secondary viral stimuli may alter patterns of cryptococcal dissemination in the host.
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Affiliation(s)
- Paula I. Seoane
- Institute of Microbiology & Infection and School of Biosciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom
| | - Leanne M. Taylor-Smith
- Institute of Microbiology & Infection and School of Biosciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom
| | - David Stirling
- Division of Infection and Immunity, University College London, London, United Kingdom
| | - Lucy C. K. Bell
- Division of Infection and Immunity, University College London, London, United Kingdom
| | - Mahdad Noursadeghi
- Division of Infection and Immunity, University College London, London, United Kingdom
| | | | - Robin C. May
- Institute of Microbiology & Infection and School of Biosciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom
- * E-mail:
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Mlcochova P, Caswell SJ, Taylor IA, Towers GJ, Gupta RK. DNA damage induced by topoisomerase inhibitors activates SAMHD1 and blocks HIV-1 infection of macrophages. EMBO J 2018; 37:50-62. [PMID: 29084722 PMCID: PMC5753034 DOI: 10.15252/embj.201796880] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 09/19/2017] [Accepted: 09/22/2017] [Indexed: 12/15/2022] Open
Abstract
We report that DNA damage induced by topoisomerase inhibitors, including etoposide (ETO), results in a potent block to HIV-1 infection in human monocyte-derived macrophages (MDM). SAMHD1 suppresses viral reverse transcription (RT) through depletion of cellular dNTPs but is naturally switched off by phosphorylation in a subpopulation of MDM found in a G1-like state. We report that SAMHD1 was activated by dephosphorylation following ETO treatment, along with loss of expression of MCM2 and CDK1, and reduction in dNTP levels. Suppression of infection occurred after completion of viral DNA synthesis, at the step of 2LTR circle and provirus formation. The ETO-induced block was completely rescued by depletion of SAMHD1 in MDM Concordantly, infection by HIV-2 and SIVsm encoding the SAMHD1 antagonist Vpx was insensitive to ETO treatment. The mechanism of DNA damage-induced blockade of HIV-1 infection involved activation of p53, p21, decrease in CDK1 expression, and SAMHD1 dephosphorylation. Therefore, topoisomerase inhibitors regulate SAMHD1 and HIV permissivity at a post-RT step, revealing a mechanism by which the HIV-1 reservoir may be limited by chemotherapeutic drugs.
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Affiliation(s)
| | - Sarah J Caswell
- Macromolecular Structure Laboratory, The Francis Crick Institute, London, UK
| | - Ian A Taylor
- Macromolecular Structure Laboratory, The Francis Crick Institute, London, UK
| | | | - Ravindra K Gupta
- Division of Infection and Immunity, UCL, London, UK
- Africa Health Research Institute, Durban, KwaZulu Natal, South Africa
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3
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Mlcochova P, Sutherland KA, Watters SA, Bertoli C, de Bruin RA, Rehwinkel J, Neil SJ, Lenzi GM, Kim B, Khwaja A, Gage MC, Georgiou C, Chittka A, Yona S, Noursadeghi M, Towers GJ, Gupta RK. A G1-like state allows HIV-1 to bypass SAMHD1 restriction in macrophages. EMBO J 2017; 36:604-616. [PMID: 28122869 PMCID: PMC5331754 DOI: 10.15252/embj.201696025] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Revised: 12/16/2016] [Accepted: 12/21/2016] [Indexed: 01/09/2023] Open
Abstract
An unresolved question is how HIV-1 achieves efficient replication in terminally differentiated macrophages despite the restriction factor SAMHD1. We reveal inducible changes in expression of cell cycle-associated proteins including MCM2 and cyclins A, E, D1/D3 in macrophages, without evidence for DNA synthesis or mitosis. These changes are induced by activation of the Raf/MEK/ERK kinase cascade, culminating in upregulation of CDK1 with subsequent SAMHD1 T592 phosphorylation and deactivation of its antiviral activity. HIV infection is limited to these G1-like phase macrophages at the single-cell level. Depletion of SAMHD1 in macrophages decouples the association between infection and expression of cell cycle-associated proteins, with terminally differentiated macrophages becoming highly susceptible to HIV-1. We observe both embryo-derived and monocyte-derived tissue-resident macrophages in a G1-like phase at frequencies approaching 20%, suggesting how macrophages sustain HIV-1 replication in vivo Finally, we reveal a SAMHD1-dependent antiretroviral activity of histone deacetylase inhibitors acting via p53 activation. These data provide a basis for host-directed therapeutic approaches aimed at limiting HIV-1 burden in macrophages that may contribute to curative interventions.
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Affiliation(s)
- Petra Mlcochova
- Division of Infection and Immunity, University College London, London, UK
| | | | - Sarah A Watters
- Division of Infection and Immunity, University College London, London, UK
| | - Cosetta Bertoli
- MRC Laboratory for Molecular Cell Biology, University College London, London, UK
| | - Rob Am de Bruin
- MRC Laboratory for Molecular Cell Biology, University College London, London, UK
| | - Jan Rehwinkel
- Medical Research Council Human Immunology Unit, Radcliffe Department of Medicine, Medical Research Council Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Stuart J Neil
- Division of Immunology, Infection and Inflammatory Disease, King's College, London, UK
| | - Gina M Lenzi
- Department of Pediatrics, Center for Drug Discovery, Emory School of Medicine, Atlanta, GA, USA
| | - Baek Kim
- Department of Pediatrics, Center for Drug Discovery, Emory School of Medicine, Atlanta, GA, USA
| | - Asim Khwaja
- Research Department of Haematology, UCL, London, UK
| | - Matthew C Gage
- Division of Medicine, University College London, London, UK
| | | | | | - Simon Yona
- Division of Medicine, University College London, London, UK
| | - Mahdad Noursadeghi
- Division of Infection and Immunity, University College London, London, UK
| | - Greg J Towers
- Division of Infection and Immunity, University College London, London, UK
| | - Ravindra K Gupta
- Division of Infection and Immunity, University College London, London, UK
- Africa Health Research Institute, KwaZulu Natal, South Africa
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Danaviah S, de Oliveira T, Gordon M, Govender S, Chelule P, Pillay S, Naicker T, Cassol S, Ndung'u T. Analysis of Dominant HIV Quasispecies Suggests Independent Viral Evolution Within Spinal Granulomas Coinfected with Mycobacterium tuberculosis and HIV-1 Subtype C. AIDS Res Hum Retroviruses 2016; 32:262-70. [PMID: 26564424 DOI: 10.1089/aid.2015.0189] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Extrapulmonary tuberculosis (TB) is a significant public health challenge in South Africa and worldwide, largely fuelled by the HIV epidemic. In spinal TB, Mycobacteria infect the spinal column without dissemination to the spinal cord. The immune microenvironment, target cell characteristics, and other evolutionary forces within granulomas during HIV/TB coinfection are poorly characterized. We investigated whether spinal TB granulomas represent a sequestered anatomical site where independent HIV evolution occurs, and assessed the role of macrophages as a target cell for both HIV and mycobacteria. RNA was extracted from plasma and granulomatous tissue from six antiretroviral-naive HIV-1/spinal TB-coinfected patients, RT-PCR amplified, and the C2-V5 env segment was cloned and sequenced. Analysis of genetic diversity, phylogeny and coalescence patterns was performed on clonal sequences. To investigate their role in HIV sequestration, macrophages and the HIV-1 p24 protein were immune localized and ultrastructural features were studied. Intercompartment diversity measurements and phylogenetic reconstruction revealed anatomically distinct monophyletic HIV-1 clusters in four of six patients. Genotypic CCR5-tropic variants were predominant (98.9%) with conservation of putative N-linked glycosylation sites in both compartments. CD68(+) reactivity was associated with higher tissue viral load (r = 1.0; p < 0.01) but not greater intrapatient diversity (r = 0.60; p > 0.05). Ultrastructural imaging revealed the presence of bacterial and virus-like particles within membrane-bound intracellular compartments of macrophages. Spinal tuberculosis granulomas may form anatomically discreet sites of divergent viral evolution. Macrophages in these granulomas harbored both pathogens, suggesting that they may facilitate the process of viral sequestration within this compartment.
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Affiliation(s)
- Sivapragashini Danaviah
- Africa Centre for Health and Population Studies, Nelson R. Mandela School of Medicine, University of KwaZulu-Natal (UKZN), Durban, South Africa
| | - Tulio de Oliveira
- Africa Centre for Health and Population Studies, Nelson R. Mandela School of Medicine, University of KwaZulu-Natal (UKZN), Durban, South Africa
| | - Michelle Gordon
- Department of Virology, Nelson R. Mandela School of Medicine, UKZN, Durban, South Africa
- KwaZulu-Natal Research Institute for Tuberculosis and HIV (K-RITH), UKZN, Durban, South Africa
| | - Shunmugam Govender
- Department of Orthopedics, Nelson R. Mandela School of Medicine, UKZN, Durban, South Africa
| | - Paul Chelule
- School of Public Health, Sefako Makgatho Health Sciences University, Medunsa, South Africa
| | - Sureshnee Pillay
- Africa Centre for Health and Population Studies, Nelson R. Mandela School of Medicine, University of KwaZulu-Natal (UKZN), Durban, South Africa
| | - Thajasvarie Naicker
- Optics and Imaging Centre, Nelson R. Mandela School of Medicine, UKZN, Durban, South Africa
| | - Sharon Cassol
- MRC Inflammation and Immunity Unit, Department of Immunology, University of Pretoria, Pretoria, South Africa
| | - Thumbi Ndung'u
- KwaZulu-Natal Research Institute for Tuberculosis and HIV (K-RITH), UKZN, Durban, South Africa
- HIV Pathogenesis Programme, Doris Duke Medical Research Institute, Nelson R. Mandela School of Medicine, UKZN, Durban, South Africa
- Max Planck Institute for Infection Biology, Chariteplatz, Berlin, Germany
- The Ragon Institute of MGH, MIT and Harvard University, Cambridge, Massachusetts
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Janocko L, Althouse AD, Brand RM, Cranston RD, McGowan I. The Molecular Characterization of Intestinal Explant HIV Infection Using Polymerase Chain Reaction-Based Techniques. AIDS Res Hum Retroviruses 2015; 31:981-91. [PMID: 26214703 PMCID: PMC4576939 DOI: 10.1089/aid.2015.0165] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The ex vivo mucosal explant model is frequently used to test the efficacy of microbicides that have the potential for preventing HIV-1 transmission. The conventional assessment of product efficacy has been the extent of HIV-1 p24 suppression in supernatant fluids sampled up to day 14 after HIV-1 challenge ex vivo. The purpose of this study was to determine if measurement of HIV-1 nucleic acids by real-time PCR and HIV-1 integration by Alu-gag PCR provides advantages with regard to monitoring HIV-1 infection in explants. Rectal biopsies from HIV-1-negative individuals were challenged with 1 × 10(5) virions/ml of HIV-1BaL or HIV-1CH077 ex vivo. HIV-1 RNA and HIV-1 p24 in supernatant fluids and HIV-1 nucleic acids and integrated provirus in individual biopsies were measured at days 1-14 after infection. HIV-1 RNA and proviral DNA were measured by quantitative real-time PCR (qRT-PCR) while integrated virus was detected by Alu-gag PCR. Real-time PCR assays detecting HIV-1 DNA and RNA performed similarly provided that the infecting virus sequences were a good match with the sequences of the assay primers and probes. Increased HIV-1 nucleic acid levels and DNA integration were measurable on days 11 and 14 after infection. The magnitude of explant infection was similar after challenge with HIV-1BaL and HIV-1CH077, although the trajectory of infection was delayed in the HIV-1CH077-infected biopsies. In the majority of experiments, qRT-PCR did not appreciably shorten the time necessary to detect evidence of HIV-1 infection.
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Affiliation(s)
- Laura Janocko
- Magee-Womens Research Institute, Pittsburgh, Pennsylvania
| | - Andrew D. Althouse
- Magee-Womens Research Institute, Pittsburgh, Pennsylvania
- University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Rhonda M. Brand
- Magee-Womens Research Institute, Pittsburgh, Pennsylvania
- University of Pittsburgh, Pittsburgh, Pennsylvania
| | | | - Ian McGowan
- Magee-Womens Research Institute, Pittsburgh, Pennsylvania
- University of Pittsburgh, Pittsburgh, Pennsylvania
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Abstract
UNLABELLED Monocyte-derived dendritic cells (MDDC) stimulate CD8 cytotoxic T lymphocytes (CTL) by presenting endogenous and exogenous viral peptides via major histocompatibility complex class I (MHC-I) molecules. MDDC are poorly susceptible to HIV-1, in part due to the presence of SAMHD1, a cellular enzyme that depletes intracellular deoxynucleoside triphosphates (dNTPs) and degrades viral RNA. Vpx, an HIV-2/SIVsm protein absent from HIV-1, antagonizes SAMHD1 by inducing its degradation. The impact of SAMHD1 on the adaptive cellular immune response remains poorly characterized. Here, we asked whether SAMHD1 modulates MHC-I-restricted HIV-1 antigen presentation. Untreated MDDC or MDDC pretreated with Vpx were exposed to HIV-1, and antigen presentation was examined by monitoring the activation of an HIV-1 Gag-specific CTL clone. SAMHD1 depletion strongly enhanced productive infection of MDDC as well as endogenous HIV-1 antigen presentation. Time-lapse microscopy analysis demonstrated that in the absence of SAMHD1, the CTL rapidly killed infected MDDC. We also report that various transmitted/founder (T/F) HIV-1 strains poorly infected MDDC and, as a consequence, did not stimulate CTL. Vesicular stomatitis virus glycoprotein (VSV-G) pseudotyping of T/F alleviated a block in viral entry and induced antigen presentation only in the absence of SAMHD1. Furthermore, by using another CTL clone that mostly recognizes incoming HIV-1 antigens, we demonstrate that SAMHD1 does not influence exogenous viral antigen presentation. Altogether, our results demonstrate that the antiviral activity of SAMHD1 impacts antigen presentation by DC, highlighting the link that exists between restriction factors and adaptive immune responses. IMPORTANCE Upon viral infection, DC may present antigens derived from incoming viral material in the absence of productive infection of DC or from newly synthesized viral proteins. In the case of HIV, productive infection of DC is blocked at an early postentry step. This is due to the presence of SAMHD1, a cellular enzyme that depletes intracellular levels of dNTPs and inhibits viral reverse transcription. We show that the depletion of SAMHD1 in DCs strongly stimulates the presentation of viral antigens derived from newly produced viral proteins, leading to the activation of HIV-1-specific cytotoxic T lymphocytes (CTL). We further show in real time that the enhanced activation of CTL leads to killing of infected DCs. Our results indicate that the antiviral activity of SAMHD1 not only impacts HIV replication but also impacts antigen presentation by DC. They highlight the link that exists between restriction factors and adaptive immune responses.
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Peters PJ, Gonzalez-Perez MP, Musich T, Moore Simas TA, Lin R, Morse AN, Shattock RJ, Derdeyn CA, Clapham PR. Infection of ectocervical tissue and universal targeting of T-cells mediated by primary non-macrophage-tropic and highly macrophage-tropic HIV-1 R5 envelopes. Retrovirology 2015; 12:48. [PMID: 26055104 PMCID: PMC4459458 DOI: 10.1186/s12977-015-0176-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 05/19/2015] [Indexed: 12/21/2022] Open
Abstract
Background HIV-1 variants carrying non-macrophage-tropic HIV-1 R5 envelopes (Envs) are predominantly transmitted and persist in immune tissue even in AIDS patients who have highly macrophage-tropic variants in the brain. Non-macrophage-tropic R5 Envs require high levels of CD4 for infection contrasting with macrophage-tropic Envs, which can efficiently mediate infection of cells via low CD4. Here, we investigated whether non-macrophage-tropic R5 Envs from the acute stage of infection (including transmitted/founder Env) mediated more efficient infection of ectocervical explant cultures compared to non-macrophage-tropic and highly macrophage-tropic R5 Envs from late disease. Results We used Env+ pseudovirions that carried a GFP reporter gene to measure infection of the first cells targeted in ectocervical explant cultures. In straight titrations of Env+ pseudovirus supernatants, mac-tropic R5 Envs from late disease mediated slightly higher infectivities for ectocervical explants although this was not significant. Surprisingly, explant infection by several T/F/acute Envs was lower than for Envs from late disease. However, when infectivity for explants was corrected to account for differences in the overall infectivity of each Env+ pseudovirus (measured on highly permissive HeLa TZM-bl cells), non-mac-tropic early and late disease Env+ pseudoviruses mediated significantly higher infection. This observation suggests that cervical tissue preferentially supports non-mac-tropic Env+ viruses compared to mac-tropic viruses. Finally, we show that T-cells were the main targets for infection regardless of whether explants were stimulated with T-cell or monocyte/macrophage cytokines. There was no evidence of macrophage infection even for pseudovirions carrying highly mac-tropic Envs from brain tissue or for the highly mac-tropic, laboratory strain, BaL, which targeted T-cells in the explant tissue. Conclusions Our data support ectocervical tissue as a favorable environment for non-mac-tropic HIV-1 R5 variants and emphasize the role of T-cells as initial targets for infection even for highly mac-tropic variants. Electronic supplementary material The online version of this article (doi:10.1186/s12977-015-0176-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Paul J Peters
- Program in Molecular Medicine and Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Biotech 2, 373 Plantation Street, Worcester, MA, 01605-2377, USA.
| | - Maria Paz Gonzalez-Perez
- Program in Molecular Medicine and Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Biotech 2, 373 Plantation Street, Worcester, MA, 01605-2377, USA.
| | - Thomas Musich
- Program in Molecular Medicine and Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Biotech 2, 373 Plantation Street, Worcester, MA, 01605-2377, USA.
| | - Tiffany A Moore Simas
- Department of Ob/Gyn, University of Massachusetts Memorial Health Care, 119 Belmont Street, Worcester, MA, 01605, USA.
| | - Rongheng Lin
- School of Public Health and Health Sciences, University of Massachusetts, 411 Arnold House, 715 North Pleasant Street, Amherst, MA, 01003-9304, USA.
| | - Abraham N Morse
- Department of Ob/Gyn, University of Massachusetts Memorial Health Care, 119 Belmont Street, Worcester, MA, 01605, USA.
| | - Robin J Shattock
- Department of Medicine, St Mary's Campus, Imperial College, Medical School Building, London, W21PG, UK.
| | - Cynthia A Derdeyn
- Department of Pathology and Laboratory Medicine, Emory Vaccine Center at Yerkes National Primate Center, Emory University, 954 Gatewood Road, Atlanta, GA, 30329, USA.
| | - Paul R Clapham
- Program in Molecular Medicine and Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Biotech 2, 373 Plantation Street, Worcester, MA, 01605-2377, USA.
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Simon V, Bloch N, Landau NR. Intrinsic host restrictions to HIV-1 and mechanisms of viral escape. Nat Immunol 2015; 16:546-53. [PMID: 25988886 PMCID: PMC6908429 DOI: 10.1038/ni.3156] [Citation(s) in RCA: 215] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 03/24/2015] [Indexed: 02/06/2023]
Abstract
To replicate in their hosts, viruses have to navigate the complexities of the mammalian cell, co-opting mechanisms of cellular physiology while defeating restriction factors that are dedicated to halting their progression. Primate lentiviruses devote a relatively large portion of their coding capacity to counteracting restriction factors by encoding accessory proteins dedicated to neutralizing the antiviral function of these intracellular inhibitors. Research into the roles of the accessory proteins has revealed the existence of previously undetected intrinsic defenses, provided insight into the evolution of primate lentiviruses as they adapt to new species and uncovered new targets for the development of therapeutics. This Review discusses the biology of the restriction factors APOBEC3, SAMHD1 and tetherin and the viral accessory proteins that counteract them.
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Affiliation(s)
- Viviana Simon
- Department of Microbiology, The Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, New York, USA
| | - Nicolin Bloch
- Department of Microbiology, NYU School of Medicine, New York, New York, USA
| | - Nathaniel R Landau
- Department of Microbiology, NYU School of Medicine, New York, New York, USA
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