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Queiroz MAF, de Oliveira AQT, Moura TCF, Brito WRDS, Santana EGM, de Lima LLP, Lopes FT, Bichara CDA, Amoras EDSG, Ishak R, Vallinoto IMVC, Vallinoto ACR. The Expression Levels of TREX1 and IFN-α Are Associated with Immune Reconstitution in HIV-1-Infected Individuals. Viruses 2024; 16:499. [PMID: 38675842 PMCID: PMC11054413 DOI: 10.3390/v16040499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 03/21/2024] [Accepted: 03/22/2024] [Indexed: 04/28/2024] Open
Abstract
TREX1 acts in the initial prevention of an autoimmune response, but it may contribute to the permissiveness of retrovirus infections. This study investigated the association between the levels of TREX1 gene expression with the polymorphisms TREX1 rs3135941 (T/C) and TREX1 rs3135945 (G/A), and the presence of antinuclear antibodies (ANA) in antiretroviral therapy (ART)-naïve individuals and after 1 year of treatment. Blood samples from 119 individuals with HIV-1 were subjected to genotyping of polymorphisms and quantification of TREX1 gene expression and HIV-1 viral load by qPCR. The concentration of IFN-α and the number of CD4+/CD8+ T lymphocytes were determined by ELISA and flow cytometry, respectively; ANA was investigated by immunofluorescence. A control group of 167 seronegative individuals was used for the comparison of genotypic frequencies. The frequency of the polymorphisms were not associated with HIV infection or with variations in the expression of TREX1 and IFN-α (p > 0.05). ART-naïve individuals exhibited higher TREX1 expression and lower IFN-α expression. After 1 year of ART, TREX1 levels were reduced, while IFN-α and CD4+ T lymphocytes were elevated (p < 0.05). Some individuals on ART presented ANA. These results suggest that ART-mediated restoration of immune competence is associated with a reduction in TREX1 expression, which may induce the development of ANA, regardless of the polymorphism investigated.
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Affiliation(s)
- Maria Alice Freitas Queiroz
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
- Graduate Program in Biology of Infectious and Parasitic Agents, Federal University of Pará, Belém 66.075-110, PA, Brazil
| | - Allysson Quintino Tenório de Oliveira
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
- Graduate Program in Biology of Infectious and Parasitic Agents, Federal University of Pará, Belém 66.075-110, PA, Brazil
| | - Tuane Carolina Ferreira Moura
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
- Graduate Program in Biology of Infectious and Parasitic Agents, Federal University of Pará, Belém 66.075-110, PA, Brazil
| | - Wandrey Roberto dos Santos Brito
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
- Graduate Program in Biology of Infectious and Parasitic Agents, Federal University of Pará, Belém 66.075-110, PA, Brazil
| | - Emmanuelle Giuliana Mendes Santana
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
| | - Lorena Leticia Peixoto de Lima
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
| | - Felipe Teixeira Lopes
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
- Graduate Program in Biology of Infectious and Parasitic Agents, Federal University of Pará, Belém 66.075-110, PA, Brazil
| | - Carlos David Araújo Bichara
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
| | - Ednelza da Silva Graça Amoras
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
| | - Ricardo Ishak
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
| | - Izaura Maria Vieira Cayres Vallinoto
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
| | - Antonio Carlos Rosário Vallinoto
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém 66.075-110, PA, Brazil; (A.Q.T.d.O.); (T.C.F.M.); (W.R.d.S.B.); (E.G.M.S.); (L.L.P.d.L.); (F.T.L.); (C.D.A.B.); (E.d.S.G.A.); (R.I.); (I.M.V.C.V.); (A.C.R.V.)
- Graduate Program in Biology of Infectious and Parasitic Agents, Federal University of Pará, Belém 66.075-110, PA, Brazil
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Heil M. Self-DNA driven inflammation in COVID-19 and after mRNA-based vaccination: lessons for non-COVID-19 pathologies. Front Immunol 2024; 14:1259879. [PMID: 38439942 PMCID: PMC10910434 DOI: 10.3389/fimmu.2023.1259879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 12/26/2023] [Indexed: 03/06/2024] Open
Abstract
The coronavirus disease 2019 (COVID-19) pandemic triggered an unprecedented concentration of economic and research efforts to generate knowledge at unequalled speed on deregulated interferon type I signalling and nuclear factor kappa light chain enhancer in B-cells (NF-κB)-driven interleukin (IL)-1β, IL-6, IL-18 secretion causing cytokine storms. The translation of the knowledge on how the resulting systemic inflammation can lead to life-threatening complications into novel treatments and vaccine technologies is underway. Nevertheless, previously existing knowledge on the role of cytoplasmatic or circulating self-DNA as a pro-inflammatory damage-associated molecular pattern (DAMP) was largely ignored. Pathologies reported 'de novo' for patients infected with Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV)-2 to be outcomes of self-DNA-driven inflammation in fact had been linked earlier to self-DNA in different contexts, e.g., the infection with Human Immunodeficiency Virus (HIV)-1, sterile inflammation, and autoimmune diseases. I highlight particularly how synergies with other DAMPs can render immunogenic properties to normally non-immunogenic extracellular self-DNA, and I discuss the shared features of the gp41 unit of the HIV-1 envelope protein and the SARS-CoV 2 Spike protein that enable HIV-1 and SARS-CoV-2 to interact with cell or nuclear membranes, trigger syncytia formation, inflict damage to their host's DNA, and trigger inflammation - likely for their own benefit. These similarities motivate speculations that similar mechanisms to those driven by gp41 can explain how inflammatory self-DNA contributes to some of most frequent adverse events after vaccination with the BNT162b2 mRNA (Pfizer/BioNTech) or the mRNA-1273 (Moderna) vaccine, i.e., myocarditis, herpes zoster, rheumatoid arthritis, autoimmune nephritis or hepatitis, new-onset systemic lupus erythematosus, and flare-ups of psoriasis or lupus. The hope is to motivate a wider application of the lessons learned from the experiences with COVID-19 and the new mRNA vaccines to combat future non-COVID-19 diseases.
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Affiliation(s)
- Martin Heil
- Departamento de Ingeniería Genética, Laboratorio de Ecología de Plantas, Centro de Investigación y de Estudios Avanzados (CINVESTAV)-Unidad Irapuato, Irapuato, Mexico
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Rahimzada M, Nahavandi M, Saffari M, Shafaei A, Mosavat A, Ahmadi Gezeldasht S, Ariaee N, Valizadeh N, Rahimi H, Rezaee SA, Derakhshan M. Gene expression study of host-human T-cell leukaemia virus type 1 (HTLV-1) interactions: adult T-cell leukaemia/lymphoma (ATLL). Mol Biol Rep 2023; 50:7479-7487. [PMID: 37480512 DOI: 10.1007/s11033-023-08626-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 06/21/2023] [Indexed: 07/24/2023]
Abstract
BACKGROUND In HTLV-1-associated malignant disease, adult T-cell leukaemia/lymphoma (ATLL), the interaction of virus and host was evaluated at the chemokines gene expression level. Also, IL-1β and Caspase-1 expressions were evaluated to investigate the importance of pyroptosis in disease development and progression. METHODS AND RESULTS The expression of host CCR6 and CXCR-3 and the HTLV-1 proviral load (PVL), Tax, and HBZ were assessed in 17 HTLV-1 asymptomatic carriers (ACs) and 12 ATLL patients using the reverse transcription-quantitative polymerase chain reaction (RT-qPCR), TaqMan method. Moreover, RT-qPCR, SYBR Green assay were performed to measure Caspase-1 and IL-1β expression. HTLV-1-Tax did not express in 91.5% of the ATLLs, while HBZ was expressed in all ATLLs. The expression of CXCR3 dramatically decreased in ATLLs compared to ACs (p = 0.001). The expression of CCR6 was lower in ATLLs than ACs (p = 0.04). The mean of PVL in ATLL patients was statistically higher than ACs (p = 0.001). Furthermore, the expression of the IL-1β between ATLLs and ACs was not statistically significant (p = 0.4). In contrast, there was a meaningful difference between Caspase-1 in ATLLs and ACs (p = 0.02). CONCLUSIONS The present study indicated that in the first stage of ATLL malignancy toward acute lymphomatous, CXCR3 and its progression phase may target the pyroptosis process. Mainly, HBZ expression could be a novel therapeutic target.
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Affiliation(s)
- Masooma Rahimzada
- Immunology Research Center, Inflammation and Inflammatory Diseases Division, Faculty of Medicine, Mashhad University of Medical Sciences, Azadi-Square, Medical Campus, Mashhad, 9177948564, Iran
| | - Mehri Nahavandi
- Antimicrobial Resistance Research Center, Bu-Ali Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran
- Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Azadi-Square, Medical Campus, Mashhad, 9177948564, Iran
| | - Mona Saffari
- Immunology Research Center, Inflammation and Inflammatory Diseases Division, Faculty of Medicine, Mashhad University of Medical Sciences, Azadi-Square, Medical Campus, Mashhad, 9177948564, Iran
| | - Azam Shafaei
- Blood Borne Infections Research Center, Academic Center for Education, Culture, and Research (ACECR), Razavi Khorasan, Mashhad, Iran
| | - Arman Mosavat
- Blood Borne Infections Research Center, Academic Center for Education, Culture, and Research (ACECR), Razavi Khorasan, Mashhad, Iran
| | - Sanaz Ahmadi Gezeldasht
- Blood Borne Infections Research Center, Academic Center for Education, Culture, and Research (ACECR), Razavi Khorasan, Mashhad, Iran
| | - Nazila Ariaee
- Immunology Research Center, Inflammation and Inflammatory Diseases Division, Faculty of Medicine, Mashhad University of Medical Sciences, Azadi-Square, Medical Campus, Mashhad, 9177948564, Iran
| | - Narges Valizadeh
- Immunology Research Center, Inflammation and Inflammatory Diseases Division, Faculty of Medicine, Mashhad University of Medical Sciences, Azadi-Square, Medical Campus, Mashhad, 9177948564, Iran
| | - Hossein Rahimi
- Hematology and Oncology Division, Department of Internal Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Seyed Abdolrahim Rezaee
- Immunology Research Center, Inflammation and Inflammatory Diseases Division, Faculty of Medicine, Mashhad University of Medical Sciences, Azadi-Square, Medical Campus, Mashhad, 9177948564, Iran.
| | - Mohammad Derakhshan
- Antimicrobial Resistance Research Center, Bu-Ali Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran.
- Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Azadi-Square, Medical Campus, Mashhad, 9177948564, Iran.
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Mohanty S, Harhaj EW. Mechanisms of Innate Immune Sensing of HTLV-1 and Viral Immune Evasion. Pathogens 2023; 12:pathogens12050735. [PMID: 37242405 DOI: 10.3390/pathogens12050735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 05/15/2023] [Accepted: 05/18/2023] [Indexed: 05/28/2023] Open
Abstract
Human T lymphotropic virus-1 (HTLV-1) was the first identified oncoretrovirus, which infects and establishes a persistent infection in approximately 10-20 million people worldwide. Although only ~5% of infected individuals develop pathologies such as adult T-cell leukemia/lymphoma (ATLL) or a neuroinflammatory disorder termed HTLV-1-asssociated myelopathy/tropical spastic paraparesis (HAM/TSP), asymptomatic carriers are more susceptible to opportunistic infections. Furthermore, ATLL patients are severely immunosuppressed and prone to other malignancies and other infections. The HTLV-1 replication cycle provides ligands, mainly nucleic acids (RNA, RNA/DNA intermediates, ssDNA intermediates, and dsDNA), that are sensed by different pattern recognition receptors (PRRs) to trigger immune responses. However, the mechanisms of innate immune detection and immune responses to HTLV-1 infection are not well understood. In this review, we highlight the functional roles of different immune sensors in recognizing HTLV-1 infection in multiple cell types and the antiviral roles of host restriction factors in limiting persistent infection of HTLV-1. We also provide a comprehensive overview of intricate strategies employed by HTLV-1 to subvert the host innate immune response that may contribute to the development of HTLV-1-associated diseases. A more detailed understanding of HTLV-1-host pathogen interactions may inform novel strategies for HTLV-1 antivirals, vaccines, and treatments for ATLL or HAM/TSP.
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Affiliation(s)
- Suchitra Mohanty
- Department of Microbiology and Immunology, Penn State College of Medicine, Hershey, PA 17033, USA
| | - Edward W Harhaj
- Department of Microbiology and Immunology, Penn State College of Medicine, Hershey, PA 17033, USA
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Host Cell Restriction Factors Blocking Efficient Vector Transduction: Challenges in Lentiviral and Adeno-Associated Vector Based Gene Therapies. Cells 2023; 12:cells12050732. [PMID: 36899868 PMCID: PMC10001033 DOI: 10.3390/cells12050732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 02/02/2023] [Accepted: 02/08/2023] [Indexed: 03/03/2023] Open
Abstract
Gene therapy relies on the delivery of genetic material to the patient's cells in order to provide a therapeutic treatment. Two of the currently most used and efficient delivery systems are the lentiviral (LV) and adeno-associated virus (AAV) vectors. Gene therapy vectors must successfully attach, enter uncoated, and escape host restriction factors (RFs), before reaching the nucleus and effectively deliver the therapeutic genetic instructions to the cell. Some of these RFs are ubiquitously expressed in mammalian cells, while others are cell-specific, and others still are expressed only upon induction by danger signals as type I interferons. Cell restriction factors have evolved to protect the organism against infectious diseases and tissue damage. These restriction factors can be intrinsic, directly acting on the vector, or related with the innate immune response system, acting indirectly through the induction of interferons, but both are intertwined. The innate immunity is the first line of defense against pathogens and, as such cells derived from myeloid progenitors (but not only), are well equipped with RFs to detect pathogen-associated molecular patterns (PAMPs). In addition, some non-professional cells, such as epithelial cells, endothelial cells, and fibroblasts, play major roles in pathogen recognition. Unsurprisingly, foreign DNA and RNA molecules are among the most detected PAMPs. Here, we review and discuss identified RFs that block LV and AAV vector transduction, hindering their therapeutic efficacy.
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Carcone A, Journo C, Dutartre H. Is the HTLV-1 Retrovirus Targeted by Host Restriction Factors? Viruses 2022; 14:v14081611. [PMID: 35893677 PMCID: PMC9332716 DOI: 10.3390/v14081611] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/18/2022] [Accepted: 07/19/2022] [Indexed: 02/04/2023] Open
Abstract
Human T cell leukemia virus type 1 (HTLV-1), the etiological agent of adult T cell leukemia/lymphoma (ATLL) and of HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP), was identified a few years before Human Immunodeficiency Virus (HIV). However, forty years later, our comprehension of HTLV-1 immune detection and the host immune responses to HTLV-1 is far more limited than for HIV. In addition to innate and adaptive immune responses that rely on specialized cells of the immune system, host cells may also express a range of antiviral factors that inhibit viral replication at different stages of the cycle, in a cell-autonomous manner. Multiple antiviral factors allowing such an intrinsic immunity have been primarily and extensively described in the context HIV infection. Here, we provide an overview of whether known HIV restriction factors might act on HTLV-1 replication. Interestingly, many of them do not exert any antiviral activity against HTLV-1, and we discuss viral replication cycle specificities that could account for these differences. Finally, we highlight future research directions that could help to identify antiviral factors specific to HTLV-1.
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Hantak MP, Einstein J, Kearns RB, Shepherd JD. Intercellular Communication in the Nervous System Goes Viral. Trends Neurosci 2021; 44:248-259. [PMID: 33485691 PMCID: PMC8041237 DOI: 10.1016/j.tins.2020.12.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 11/19/2020] [Accepted: 12/30/2020] [Indexed: 12/20/2022]
Abstract
Viruses and transposable elements are major drivers of evolution and make up over half the sequences in the human genome. In some cases, these elements are co-opted to perform biological functions for the host. Recent studies made the surprising observation that the neuronal gene Arc forms virus-like protein capsids that can transfer RNA between neurons to mediate a novel intercellular communication pathway. Phylogenetic analyses showed that mammalian Arc is derived from an ancient retrotransposon of the Ty3/gypsy family and contains homology to the retroviral Gag polyproteins. The Drosophila Arc homologs, which are independently derived from the same family of retrotransposons, also mediate cell-to-cell signaling of RNA at the neuromuscular junction; a striking example of convergent evolution. Here we propose an Arc 'life cycle', based on what is known about retroviral Gag, and discuss how elucidating these biological processes may lead to novel insights into brain plasticity and memory.
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Affiliation(s)
- Michael P Hantak
- Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, UT, USA
| | - Jenifer Einstein
- Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, UT, USA
| | - Rachel B Kearns
- Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, UT, USA
| | - Jason D Shepherd
- Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, UT, USA.
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Queiroz MAF, Amoras EDSG, Moura TCF, da Costa CA, de Sousa MS, Lima SS, Ishak R, Vallinoto ACR. The SAMHD1 rs6029941 (A/G) Polymorphism Seems to Influence the HTLV-1 Proviral Load and IFN-Alpha Levels. Front Cell Infect Microbiol 2020; 10:246. [PMID: 32656092 PMCID: PMC7326033 DOI: 10.3389/fcimb.2020.00246] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 04/29/2020] [Indexed: 01/19/2023] Open
Abstract
SAMHD1, a host dNTPase, acts as a retroviral restriction factor by degrading the pool of nucleotides available for the initial reverse transcription of retroviruses, including HTLV-1. Polymorphisms in the SAMDH1 gene may alter the enzymatic expression and influence the course of infection by the virus. The present study investigated the effect of polymorphisms on HTLV-1 infection susceptibility and on progression to disease in 108 individuals infected by HTLV-1 (47 symptomatic and 61 asymptomatic) and 100 individuals in a control group. SAMHD1 rs6029941 (G/A) genotyping and HTLV-1 proviral load measurements were performed using real-time PCR and plasma IFN-α was measured by ELISA. Polymorphism frequency was not associated with HTLV-1 infection susceptibility or with the presence of symptoms. The proviral load was significantly higher in symptomatic individuals with the G allele (p = 0.0143), which presented lower levels of IFN-α (p = 0.0383). SAMHD1 polymorphism is associated with increased proviral load and reduced levels of IFN-α in symptomatic patients, and may be a factor that contributes to the appearance of disease symptoms.
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Affiliation(s)
| | | | | | - Carlos Araújo da Costa
- Laboratory of Cellular and Molecular Biology, Tropical Medicine Center, Federal University of Pará, Belém, Brazil
| | - Maisa Silva de Sousa
- Laboratory of Cellular and Molecular Biology, Tropical Medicine Center, Federal University of Pará, Belém, Brazil
| | - Sandra Souza Lima
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
| | - Ricardo Ishak
- Laboratory of Virology, Institute of Biological Sciences, Federal University of Pará, Belém, Brazil
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TREX1 531C>T Polymorphism is Associated with High Proviral Load Levels in HTLV-1-Infected Persons. Viruses 2019; 12:v12010007. [PMID: 31861565 PMCID: PMC7019804 DOI: 10.3390/v12010007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Revised: 11/26/2019] [Accepted: 11/28/2019] [Indexed: 02/06/2023] Open
Abstract
Human T-lymphotropic virus type 1 (HTLV-1) deregulates the immune system and cell cycle, resulting in loss of immune tolerance and disease, including HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). Three prime repair exonuclease 1 (TREX1) maintains innate immune tolerance of the host and host-cell permissiveness to retroviral infections. TREX1 polymorphisms may influence the course of infection and autoimmune manifestations. The influence of TREX1 531C/T polymorphism was investigated in HTLV-1 infection and development of symptoms among 151 persons infected with HTLV-1 (32 HAM/TSP, 19 rheumatologic manifestations, two dermatitis, five more than one diagnosis, two probable HAM/TSP, and 91 asymptomatic individuals) and 100 uninfected persons in the control group. Polymorphism genotyping and proviral load quantification were performed by real-time polymerase chain reaction (PCR) and antinuclear antibodies (ANAs) were screened by an indirect immunofluorescence assay. No statistically significant difference was found in polymorphism genotype and allele frequencies between the infected and control groups. HAM/TSP patients showed higher frequency of TT genotype than asymptomatic persons (p = 0.0339). Proviral load was significantly higher among individuals with CT/TT genotypes and CC genotype carriers had lower proviral load and higher levels of proinflammatory cytokines. ANAs were present only in the HAM/TSP group. TREX1 531C>T polymorphism seems to be associated with TREX-1 regulation and HTLV-1 infection.
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Interplay between Intrinsic and Innate Immunity during HIV Infection. Cells 2019; 8:cells8080922. [PMID: 31426525 PMCID: PMC6721663 DOI: 10.3390/cells8080922] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 08/13/2019] [Accepted: 08/15/2019] [Indexed: 02/06/2023] Open
Abstract
Restriction factors are antiviral components of intrinsic immunity which constitute a first line of defense by blocking different steps of the human immunodeficiency virus (HIV) replication cycle. In immune cells, HIV infection is also sensed by several pattern recognition receptors (PRRs), leading to type I interferon (IFN-I) and inflammatory cytokines production that upregulate antiviral interferon-stimulated genes (ISGs). Several studies suggest a link between these two types of immunity. Indeed, restriction factors, that are generally interferon-inducible, are able to modulate immune responses. This review highlights recent knowledge of the interplay between restriction factors and immunity inducing antiviral defenses. Counteraction of this intrinsic and innate immunity by HIV viral proteins will also be discussed.
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Heil M, Vega-Muñoz I. Nucleic Acid Sensing in Mammals and Plants: Facts and Caveats. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2018; 345:225-285. [PMID: 30904194 DOI: 10.1016/bs.ircmb.2018.10.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The accumulation of nucleic acids in aberrant compartments is a signal of danger: fragments of cytosolic or extracellular self-DNA indicate cellular dysfunctions or disruption, whereas cytosolic fragments of nonself-DNA or RNA indicate infections. Therefore, nucleic acids trigger immunity in mammals and plants. In mammals, endosomal Toll-like receptors (TLRs) sense single-stranded (ss) or double-stranded (ds) RNA or CpG-rich DNA, whereas various cytosolic receptors sense dsDNA. Although a self/nonself discrimination could favor targeted immune responses, no sequence-specific sensing of nucleic acids has been reported for mammals. Specific immune responses to extracellular self-DNA versus DNA from related species were recently reported for plants, but the underlying mechanism remains unknown. The subcellular localization of mammalian receptors can favor self/nonself discrimination based on the localization of DNA fragments. However, autoantibodies and diverse damage-associated molecular patterns (DAMPs) shuttle DNA through membranes, and most of the mammalian receptors share downstream signaling elements such as stimulator of interferon genes (STING) and the master transcription regulators, nuclear factor (NF)-κB, and interferon regulatory factor 3 (IRF3). The resulting type I interferon (IFN) response stimulates innate immunity against multiple threats-from infection to physical injury or endogenous DNA damage-all of which lead to the accumulation of eDNA or cytoplasmatic dsDNA. Therefore, no or only low selective pressures might have favored a strict self/nonself discrimination in nucleic acid sensing. We conclude that the discrimination between self- and nonself-DNA is likely to be less strict-and less important-than assumed originally.
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Affiliation(s)
- Martin Heil
- Departmento de Ingeniería Genética, CINVESTAV-Irapuato, Irapuato, Guanajuato, Mexico.
| | - Isaac Vega-Muñoz
- Departmento de Ingeniería Genética, CINVESTAV-Irapuato, Irapuato, Guanajuato, Mexico
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12
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Mauney CH, Perrino FW, Hollis T. Identification of Inhibitors of the dNTP Triphosphohydrolase SAMHD1 Using a Novel and Direct High-Throughput Assay. Biochemistry 2018; 57:6624-6636. [PMID: 30380297 DOI: 10.1021/acs.biochem.8b01038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dNTP triphosphohydrolase SAMHD1 is a regulator of cellular dNTP pools. Given its central role in nucleotide metabolism, SAMHD1 performs important functions in cellular homeostasis, cell cycle regulation, and innate immunity. It therefore represents a high-profile target for small molecule drug design. SAMHD1 has a complex mechanism of catalytic activation that makes the design of an activating compound challenging. However, an inhibitor of SAMHD1 could serve multiple therapeutic roles, including the potentiation of antiviral and anticancer drug regimens. The lack of high-throughput screens that directly measure SAMHD1 catalytic activity has impeded efforts to identify inhibitors of SAMHD1. Here we describe a novel high-throughput screen that directly measures SAMHD1 catalytic activity. This assay results in a colorimetric end point that can be read spectrophotometrically and utilizes bis(4-nitrophenyl) phosphate as the substrate and Mn2+ as the activating cation that facilitates catalysis. When used to screen a library of Food and Drug Administration-approved drugs, this HTS identified multiple novel compounds that inhibited SAMHD1 dNTPase activity at micromolar concentrations.
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Affiliation(s)
- Christopher H Mauney
- Center for Structural Biology, Department of Biochemistry , Wake Forest School of Medicine , Winston-Salem , North Carolina 27157 , United States
| | - Fred W Perrino
- Center for Structural Biology, Department of Biochemistry , Wake Forest School of Medicine , Winston-Salem , North Carolina 27157 , United States
| | - Thomas Hollis
- Center for Structural Biology, Department of Biochemistry , Wake Forest School of Medicine , Winston-Salem , North Carolina 27157 , United States
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13
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Mauney CH, Hollis T. SAMHD1: Recurring roles in cell cycle, viral restriction, cancer, and innate immunity. Autoimmunity 2018; 51:96-110. [PMID: 29583030 PMCID: PMC6117824 DOI: 10.1080/08916934.2018.1454912] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 03/16/2018] [Indexed: 12/24/2022]
Abstract
Sterile alpha motif and histidine-aspartic acid domain-containing protein 1 (SAMHD1) is a deoxynucleotide triphosphate (dNTP) hydrolase that plays an important role in the homeostatic balance of cellular dNTPs. Its emerging role as an effector of innate immunity is affirmed by mutations in the SAMHD1 gene that cause the severe autoimmune disease, Aicardi-Goutieres syndrome (AGS) and that are linked to cancer. Additionally, SAMHD1 functions as a restriction factor for retroviruses, such as HIV. Here, we review the current biochemical and biological properties of the enzyme including its structure, activity, and regulation by post-translational modifications in the context of its cellular function. We outline open questions regarding the biology of SAMHD1 whose answers will be important for understanding its function as a regulator of cell cycle progression, genomic integrity, and in autoimmunity.
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Affiliation(s)
- Christopher H Mauney
- a Department of Biochemistry , Center for Structural Biology, Wake Forest School of Medicine , Winston Salem , NC , USA
| | - Thomas Hollis
- a Department of Biochemistry , Center for Structural Biology, Wake Forest School of Medicine , Winston Salem , NC , USA
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14
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Scagnolari C, Antonelli G. Type I interferon and HIV: Subtle balance between antiviral activity, immunopathogenesis and the microbiome. Cytokine Growth Factor Rev 2018; 40:19-31. [PMID: 29576284 PMCID: PMC7108411 DOI: 10.1016/j.cytogfr.2018.03.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 02/23/2018] [Accepted: 03/08/2018] [Indexed: 02/06/2023]
Abstract
Type I interferon (IFN) response initially limits HIV-1 spread and may delay disease progression by stimulating several immune system components. Nonetheless, persistent exposure to type I IFN in the chronic phase of HIV-1 infection is associated with desensitization and/or detrimental immune activation, thereby hindering immune recovery and fostering viral persistence. This review provides a basis for understanding the complexity and function of IFN pleiotropic activity in HIV-1 infection. In particular, the dichotomous role of the IFN response in HIV-1 immunopathogenesis will be discussed, highlighting recent advances in the dynamic modulation of IFN production in acute versus chronic infection, expression signatures of IFN subtypes, and viral and host factors affecting the magnitude of IFN response during HIV-1 infection. Lastly, the review gives a forward-looking perspective on the interplay between microbiome compositions and IFN response.
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Affiliation(s)
- Carolina Scagnolari
- Department of Molecular Medicine, Laboratory of Virology Affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, Sapienza University, Rome, Italy.
| | - Guido Antonelli
- Department of Molecular Medicine, Laboratory of Virology Affiliated to Istituto Pasteur Italia - Fondazione Cenci Bolognetti, Sapienza University, Rome, Italy
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15
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Bannert N, Hofmann H, Block A, Hohn O. HERVs New Role in Cancer: From Accused Perpetrators to Cheerful Protectors. Front Microbiol 2018; 9:178. [PMID: 29487579 PMCID: PMC5816757 DOI: 10.3389/fmicb.2018.00178] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 01/25/2018] [Indexed: 02/02/2023] Open
Abstract
Initial indications that retroviruses are connected to neoplastic transformation were seen more than a century ago. This concept has also been tested for endogenized retroviruses (ERVs) that are abundantly expressed in many transformed cells. In healthy cells, ERV expression is commonly prevented by DNA methylation and other epigenetic control mechanisms. ERVs are remnants of former exogenous forms that invaded the germ line of the host and have since been vertically transmitted. Several examples of ERV-induced genomic recombination events and dysregulation of cellular genes that contribute to tumor formation have been well documented. Moreover, evidence is accumulating that certain ERV proteins have oncogenic properties. In contrast to these implications for supporting cancer induction, a recent string of papers has described favorable outcomes of increasing human ERV (HERV) RNA and DNA abundance by treatment of cancer cells with methyltransferase inhibitors. Analogous to an infecting agent, the ERV-derived nucleic acids are sensed in the cytoplasm and activate innate immune responses that drive the tumor cell into apoptosis. This "viral mimicry" induced by epigenetic drugs might offer novel therapeutic approaches to help target cancer cells that are normally difficult to treat using standard chemotherapy. In this review, we discuss both the detrimental and the new beneficial role of HERV reactivation in terms of its implications for cancer.
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Affiliation(s)
- Norbert Bannert
- HIV and Other Retroviruses, Robert Koch Institute, Berlin, Germany
| | - Henning Hofmann
- HIV and Other Retroviruses, Robert Koch Institute, Berlin, Germany
| | - Adriana Block
- HIV and Other Retroviruses, Robert Koch Institute, Berlin, Germany
| | - Oliver Hohn
- HIV and Other Retroviruses, Robert Koch Institute, Berlin, Germany
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16
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Wang L, Jiao H, Zhao J, Wang X, Sun S, Lin H. Allicin Alleviates Reticuloendotheliosis Virus-Induced Immunosuppression via ERK/Mitogen-Activated Protein Kinase Pathway in Specific Pathogen-Free Chickens. Front Immunol 2017; 8:1856. [PMID: 29312337 PMCID: PMC5744041 DOI: 10.3389/fimmu.2017.01856] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Accepted: 12/07/2017] [Indexed: 01/20/2023] Open
Abstract
Reticuloendotheliosis virus (REV), a gammaretrovirus in the Retroviridae family, causes an immunosuppressive, oncogenic, and runting-stunting syndrome in multiple avian hosts. Allicin, the main effective component of garlic, has a broad spectrum of pharmacological properties. The hypothesis that allicin could relieve REV-induced immune dysfunction was investigated in vivo and in vitro in the present study. The results showed that dietary allicin supplementation ameliorated REV-induced dysplasia and immune dysfunction in REV-infected chickens. Compared with the control groups, REV infection promoted the expression of inflammatory cytokines including interleukin (IL)-1β, IL-6, IL-10, interferon (IFN)-γ, and tumor necrosis factor-α (TNF-α), whereas, allicin reversed these changes induced by REV infection. The decreased levels of IFN-α, IFN-β, and IL-2 were observed in REV-infected chickens, which were significantly improved by allicin. Allicin suppressed the REV-induced high expression of toll-like receptors (TLRs) as well as melanoma differentiation-associated gene 5 (MDA5) and the activation of mitogen-activated protein kinase (MAPK) and the nuclear factor kappa B p65. REV stimulated the phosphorylation of JNK, ERK, and p38, the downstream key signaling molecules of MAPK pathway, while allicin retarded the augmented phosphorylation level induced by REV infection. The decreased phosphorylation level of ERK was associated with REV replication, suggesting that ERK signaling is involved in REV replication, and allicin can alleviate the REV-induced immune dysfunction by inhibiting the activation of ERK. In addition, REV infection induced oxidative damage in thymus and spleen, whereas allicin treatment significantly decreased the oxidative stress induced by REV infection, suggesting that the antioxidant effect of allicin should be at least partially responsible for the harmful effect of REV infection. In conclusion, the findings suggest that allicin alleviates the inflammation and oxidative damage caused by REV infection and exerts the potential anti-REV effect by blocking the ERK/MAPK pathway.
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Affiliation(s)
- Liyuan Wang
- Poultry Oncogenic Virus Research Laboratory, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Shandong Key Lab for Animal Biotechnology and Disease Control, Tai'an, China.,Department of Animal Science, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Shandong Key Lab for Animal Biotechnology and Disease Control, Tai'an, China
| | - Hongchao Jiao
- Department of Animal Science, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Shandong Key Lab for Animal Biotechnology and Disease Control, Tai'an, China
| | - Jingpeng Zhao
- Department of Animal Science, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Shandong Key Lab for Animal Biotechnology and Disease Control, Tai'an, China
| | - Xiaojuan Wang
- Department of Animal Science, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Shandong Key Lab for Animal Biotechnology and Disease Control, Tai'an, China
| | - Shuhong Sun
- Poultry Oncogenic Virus Research Laboratory, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Shandong Key Lab for Animal Biotechnology and Disease Control, Tai'an, China
| | - Hai Lin
- Department of Animal Science, College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Shandong Key Lab for Animal Biotechnology and Disease Control, Tai'an, China
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17
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Abstract
PURPOSE OF REVIEW HIV-1 infection is of global importance, and still incurs substantial morbidity and mortality. Although major pharmacologic advances over the past two decades have resulted in remarkable HIV-1 control, a cure is still forthcoming. One approach to a cure is to exploit natural mechanisms by which the host restricts HIV-1. Herein, we review past and recent discoveries of HIV-1 restriction factors, a diverse set of host proteins that limit HIV-1 replication at multiple levels, including entry, reverse transcription, integration, translation of viral proteins, and packaging and release of virions. RECENT FINDINGS Recent studies of intracellular HIV-1 restriction have offered unique molecular insights into HIV-1 replication and biology. Studies have revealed insights of how restriction factors drive HIV-1 evolution. Although HIV-1 restriction factors only partially control the virus, their importance is underscored by their effect on HIV-1 evolution and adaptation. The list of host restriction factors that control HIV-1 infection is likely to expand with future discoveries. A deeper understanding of the molecular mechanisms of regulation by these factors will uncover new targets for therapeutic control of HIV-1 infection.
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Affiliation(s)
- Mary Soliman
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Geetha Srikrishna
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Ashwin Balagopal
- Division of Infectious Diseases, Department of Medicine, Johns Hopkins University, Baltimore, MD, USA.
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18
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Wang J, Kang L, Song D, Liu L, Yang S, Ma L, Guo Z, Ding H, Wang H, Yang B. Ku70 Senses HTLV-1 DNA and Modulates HTLV-1 Replication. THE JOURNAL OF IMMUNOLOGY 2017; 199:2475-2482. [PMID: 28821586 DOI: 10.4049/jimmunol.1700111] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 08/01/2017] [Indexed: 01/08/2023]
Abstract
Human T lymphotropic virus type 1 (HTLV-1) belongs to the deltaretrovirus family and has been linked to multiple diseases. However, the innate host defense against HTLV-1 is unclear. In this study, we report that the expression of Ku70, a known DNA sensor against DNA viruses, could be induced by HTLV-1 infection in HeLa, PMA-differentiated THP1 cells, primary human monocytes, and human monocyte-derived macrophages. In these cells, the overexpression of Ku70 inhibited the HTLV-1 protein expression, whereas the knockdown of Ku70 promoted the HTLV-1 protein expression. Furthermore, the overexpression of Ku70 enhanced the cellular response to HTLV-1 infection, whereas Ku70 knockdown yielded the opposite effect. Additionally, Ku70 was found to interact with HTLV-1 reverse transcription intermediate ssDNA90. ssDNA90 stimulation induced Ku70 expression and Ku70 promoted ssDNA90-triggered innate immune responses. Finally, HTLV-1 infection enhanced the association between Ku70 and stimulator of IFN genes, suggesting that stimulator of IFN genes was involved in Ku70-mediated host defenses against HTLV-1 infection. Taken together, our findings suggest a new sensor that detects HTLV-1 reverse transcription intermediate and controls HTLV-1 replication. These findings may provide new angles to understand host defenses against HTLV-1 infection and HTLV-1-associated diseases.
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Affiliation(s)
- Jie Wang
- Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China.,Xinxiang Assegai Medical Laboratory Institute, Xinxiang 453003, China
| | - Lixia Kang
- Department of Laboratory Medicine, Third Affiliated Hospital of Xinxiang Medical University, Xinxiang 453003, China; and
| | - Di Song
- Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China.,Xinxiang Assegai Medical Laboratory Institute, Xinxiang 453003, China
| | - Lu Liu
- Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Shuai Yang
- Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Lingling Ma
- Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Zhixiang Guo
- Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Huaxia Ding
- Xinxiang Assegai Medical Laboratory Institute, Xinxiang 453003, China
| | - Hui Wang
- Research Center for Immunology, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China
| | - Bo Yang
- Henan Collaborative Innovation Center of Molecular Diagnosis and Laboratory Medicine, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, China; .,Xinxiang Assegai Medical Laboratory Institute, Xinxiang 453003, China
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19
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Mussabekova A, Daeffler L, Imler JL. Innate and intrinsic antiviral immunity in Drosophila. Cell Mol Life Sci 2017; 74:2039-2054. [PMID: 28102430 PMCID: PMC5419870 DOI: 10.1007/s00018-017-2453-9] [Citation(s) in RCA: 83] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 12/11/2016] [Accepted: 01/03/2017] [Indexed: 02/07/2023]
Abstract
The fruit fly Drosophila melanogaster has been a valuable model to investigate the genetic mechanisms of innate immunity. Initially focused on the resistance to bacteria and fungi, these studies have been extended to include antiviral immunity over the last decade. Like all living organisms, insects are continually exposed to viruses and have developed efficient defense mechanisms. We review here our current understanding on antiviral host defense in fruit flies. A major antiviral defense in Drosophila is RNA interference, in particular the small interfering (si) RNA pathway. In addition, complex inducible responses and restriction factors contribute to the control of infections. Some of the genes involved in these pathways have been conserved through evolution, highlighting loci that may account for susceptibility to viral infections in humans. Other genes are not conserved and represent species-specific innovations.
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Affiliation(s)
- Assel Mussabekova
- Institut de Biologie Moléculaire et Cellulaire, CNRS UPR9022, Université de Strasbourg, 15 rue René Descartes, 67000, Strasbourg, France.
| | - Laurent Daeffler
- Institut de Biologie Moléculaire et Cellulaire, CNRS UPR9022, Université de Strasbourg, 15 rue René Descartes, 67000, Strasbourg, France
| | - Jean-Luc Imler
- Institut de Biologie Moléculaire et Cellulaire, CNRS UPR9022, Université de Strasbourg, 15 rue René Descartes, 67000, Strasbourg, France
- Faculté des Sciences de la Vie, Université de Strasbourg, 28 rue Goethe, 67000, Strasbourg, France
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20
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Rizkallah G, Alais S, Futsch N, Tanaka Y, Journo C, Mahieux R, Dutartre H. Dendritic cell maturation, but not type I interferon exposure, restricts infection by HTLV-1, and viral transmission to T-cells. PLoS Pathog 2017; 13:e1006353. [PMID: 28426803 PMCID: PMC5413061 DOI: 10.1371/journal.ppat.1006353] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 05/02/2017] [Accepted: 04/13/2017] [Indexed: 12/21/2022] Open
Abstract
Human T lymphotropic Virus type 1 (HTLV-1) is the etiological agent of Adult T cell Leukemia/Lymphoma (ATLL) and HTLV-1-Associated Myelopathy/Tropical Spastic Paraparesis (HAM/TSP). Both CD4+ T-cells and dendritic cells (DCs) infected with HTLV-1 are found in peripheral blood from HTLV-1 carriers. We previously demonstrated that monocyte-derived IL-4 DCs are more susceptible to HTLV-1 infection than autologous primary T-cells, suggesting that DC infection precedes T-cell infection. However, during blood transmission, breast-feeding or sexual transmission, HTLV-1 may encounter different DC subsets present in the blood, the intestinal or genital mucosa respectively. These different contacts may impact HTLV-1 ability to infect DCs and its subsequent transfer to T-cells. Using in vitro monocyte-derived IL-4 DCs, TGF-β DCs and IFN-α DCs that mimic DCs contacting HTLV-1 in vivo, we show here that despite their increased ability to capture HTLV-1 virions, IFN-α DCs restrict HTLV-1 productive infection. Surprisingly, we then demonstrate that it is not due to the antiviral activity of type-I interferon produced by IFN-α DCs, but that it is likely to be linked to a distinct trafficking route of HTLV-1 in IL-4 DCs vs. IFN-α DCs. Finally, we demonstrate that, in contrast to IL-4 DCs, IFN-α DCs are impaired in their capacity to transfer HTLV-1 to CD4 T-cells, both after viral capture and trans-infection and after their productive infection. In conclusion, the nature of the DCs encountered by HTLV-1 upon primo-infection and the viral trafficking route through the vesicular pathway of these cells determine the efficiency of viral transmission to T-cells, which may condition the fate of infection.
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Affiliation(s)
- Gergès Rizkallah
- International Center for Research in Infectiology, Retroviral Oncogenesis laboratory, INSERM U1111 –Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Université Lyon, Lyon, France
- Equipe labellisée “Ligue Nationale Contre le Cancer”, Lyon, France
| | - Sandrine Alais
- International Center for Research in Infectiology, Retroviral Oncogenesis laboratory, INSERM U1111 –Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Université Lyon, Lyon, France
- Equipe labellisée “Ligue Nationale Contre le Cancer”, Lyon, France
| | - Nicolas Futsch
- International Center for Research in Infectiology, Retroviral Oncogenesis laboratory, INSERM U1111 –Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Université Lyon, Lyon, France
- Equipe labellisée “Ligue Nationale Contre le Cancer”, Lyon, France
| | - Yuetsu Tanaka
- Department of Immunology, Graduate School of Medicine, University of the Ryukyus, Uehara 207, Nishihara-cho, Okinawa, Japan
| | - Chloé Journo
- International Center for Research in Infectiology, Retroviral Oncogenesis laboratory, INSERM U1111 –Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Université Lyon, Lyon, France
- Equipe labellisée “Ligue Nationale Contre le Cancer”, Lyon, France
| | - Renaud Mahieux
- International Center for Research in Infectiology, Retroviral Oncogenesis laboratory, INSERM U1111 –Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Université Lyon, Lyon, France
- Equipe labellisée “Ligue Nationale Contre le Cancer”, Lyon, France
| | - Hélène Dutartre
- International Center for Research in Infectiology, Retroviral Oncogenesis laboratory, INSERM U1111 –Université Claude Bernard Lyon 1, CNRS, UMR5308, Ecole Normale Supérieure de Lyon, Université Lyon, Lyon, France
- Equipe labellisée “Ligue Nationale Contre le Cancer”, Lyon, France
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21
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Zevini A, Olagnier D, Hiscott J. Crosstalk between Cytoplasmic RIG-I and STING Sensing Pathways. Trends Immunol 2017; 38:194-205. [PMID: 28073693 PMCID: PMC5329138 DOI: 10.1016/j.it.2016.12.004] [Citation(s) in RCA: 236] [Impact Index Per Article: 33.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 12/09/2016] [Accepted: 12/12/2016] [Indexed: 12/21/2022]
Abstract
Detection of evolutionarily conserved molecules on microbial pathogens by host immune sensors represents the initial trigger of the immune response against infection. Cytosolic receptors sense viral and intracellular bacterial genomes, as well as nucleic acids produced during replication. Once activated, these sensors trigger multiple signaling cascades, converging on the production of type I interferons and proinflammatory cytokines. Although distinct classes of receptors are responsible for the RNA and DNA sensing, the downstream signaling components are physically and functionally interconnected. This review highlights the importance of the crosstalk between retinoic acid inducible gene-I (RIG-I)-mitochondrial antiviral-signaling protein (MAVS) RNA sensing and the cyclic GMP-AMP synthase (cGAS)- stimulator of interferon genes (STING) DNA sensing pathways in potentiating efficient antiviral responses. The potential of cGAS-STING manipulation as a component of cancer immunotherapy is also reviewed.
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Affiliation(s)
- Alessandra Zevini
- Istituto Pasteur - Italia, Istituto Pasteur - Fondazione Cenci Bolognetti, Rome, Italy
| | - David Olagnier
- Department of Biomedicine, Aarhus Research Center for Innate Immunology, Aarhus University, Denmark
| | - John Hiscott
- Istituto Pasteur - Italia, Istituto Pasteur - Fondazione Cenci Bolognetti, Rome, Italy.
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22
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HTLV-1 Tax impairs K63-linked ubiquitination of STING to evade host innate immunity. Virus Res 2017; 232:13-21. [PMID: 28119118 DOI: 10.1016/j.virusres.2017.01.016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Revised: 01/14/2017] [Accepted: 01/15/2017] [Indexed: 01/10/2023]
Abstract
The cellular antiviral innate immune system is essential for host defense and viruses have evolved a variety of strategies to evade the innate immunity. Human T lymphotropic virus type 1 (HTLV-1) belongs to the deltaretrovirus family and it can establish persistent infection in human beings for many years. However, how this virus evades the host innate immune responses remains unclear. Here we report a new strategy used by HTLV-1 to block innate immune responses. We observed that stimulator of interferon genes (STING) limited HTLV-1 protein expression and was critical to HTLV-1 reverse transcription intermediate (RTI) ssDNA90 triggered interferon (IFN)-β production in phorbol12-myristate13-acetate (PMA)-differentiated THP1 (PMA-THP1) cells. The HTLV-1 protein Tax inhibited STING overexpression induced transcriptional activation of IFN-β. Tax also impaired poly(dA:dT), interferon stimulatory DNA (ISD) or cyclic GMP-AMP (cGAMP) -stimulated IFN-β production, which was dependent on STING activation. Coimmunoprecipitation assays and confocal microscopy indicated that Tax was associated with STING in the same complex. Mechanistic studies suggested that Tax decreased the K63-linked ubiquitination of STING and disrupted the interactions between STING and TANK-binding kinase 1 (TBK1). These findings may shed more light on the molecular mechanisms underlying HTLV-1 infection.
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23
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Feng M, Zhang X. Immunity to Avian Leukosis Virus: Where Are We Now and What Should We Do? Front Immunol 2016; 7:624. [PMID: 28066434 PMCID: PMC5174080 DOI: 10.3389/fimmu.2016.00624] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 12/08/2016] [Indexed: 12/16/2022] Open
Abstract
Avian leukosis virus (ALV) is an avian oncogenic retrovirus causing enormous economic losses in the global poultry industry. Although ALV-related research has lasted for more than a century, there are no vaccines to protect chickens from ALV infection. The interaction between chickens and ALV remains not fully understood especially with regard to the host immunity. The current review provides an overview of our current knowledge of innate and adaptive immunity induced by ALV infection. More importantly, we have pointed out the unknown area involved in ALV-related studies, which is worthy of our serious exploring in future.
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Affiliation(s)
- Min Feng
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science, South China Agricultural University, Guangzhou, China; Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding and Key Lab of Chicken Genetics, Breeding and Reproduction, Ministry of Agriculture, Guangzhou, China
| | - Xiquan Zhang
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science, South China Agricultural University, Guangzhou, China; Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding and Key Lab of Chicken Genetics, Breeding and Reproduction, Ministry of Agriculture, Guangzhou, China
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24
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Prevention of SHIV transmission by topical IFN-β treatment. Mucosal Immunol 2016; 9:1528-1536. [PMID: 26838048 PMCID: PMC4972705 DOI: 10.1038/mi.2015.146] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 12/13/2015] [Indexed: 02/04/2023]
Abstract
Understanding vaginal and rectal HIV transmission and protective cellular and molecular mechanisms is critical for designing new prevention strategies, including those required for an effective vaccine. The determinants of protection against HIV infection are, however, poorly understood. Increasing evidence suggest that innate immune defenses may help protect mucosal surfaces from HIV transmission in highly exposed, uninfected subjects. More recent studies suggest that systemically administered type 1 interferon protects against simian immunodeficiency virus infection of macaques. Here we hypothesized that topically applied type 1 interferons might stimulate vaginal innate responses that could protect against HIV transmission. We therefore applied a recombinant human type 1 interferon (IFN-β) to the vagina of rhesus macaques and vaginally challenged them with pathogenic simian/human immunodeficiency virus (SHIV). Vaginal administration of IFN-β resulted in marked local changes in immune cell phenotype, increasing immune activation and HIV co-receptor expression, yet provided significant protection from SHIV acquisition as interferon response genes were also upregulated. These data suggest that protection from vaginal HIV acquisition may be achieved by activating innate mucosal defenses.
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Abstract
PURPOSE OF REVIEW The goal of this review is to summarize recent progress in our understanding of innate sensing of HIV. Furthermore, we present the mechanisms that HIV has evolved to attenuate innate immune responses and discuss open questions. RECENT FINDINGS Toll-like receptors (TLRs) and various cytosolic sensors induce an antiviral interferon response upon detection of genomic HIV RNA or intermediates of reverse transcription. HIV limits activation of these sensing pathways by interfering with TLR signaling and by cloaking viral nucleic acids in the cytoplasm, before proviral dsDNA translocates into the nucleus. Furthermore, the viral accessory protein Vpu mitigates antiviral gene expression by inhibiting canonical nuclear factor kappa B (NF-κB) signaling. These evasion mechanisms, however, are imperfect and HIV infection almost inevitably triggers the activation of IRF3, NF-κB and other key transcription factors of antiviral immunity. Notably, the interplay of these processes plays a critical role in the induction of chronic inflammation that drives progression to AIDS. SUMMARY HIV has evolved sophisticated but imperfect mechanisms to evade and counteract innate sensing. Whether virus-induced immune activation represents merely a suboptimal adaptation of HIV to its human host or even facilitates HIV replication, for example by increasing the number of viral target cells, remains to be clarified.
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Orecchini E, Doria M, Antonioni A, Galardi S, Ciafrè SA, Frassinelli L, Mancone C, Montaldo C, Tripodi M, Michienzi A. ADAR1 restricts LINE-1 retrotransposition. Nucleic Acids Res 2016; 45:155-168. [PMID: 27658966 PMCID: PMC5224506 DOI: 10.1093/nar/gkw834] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 09/08/2016] [Accepted: 09/09/2016] [Indexed: 12/16/2022] Open
Abstract
Adenosine deaminases acting on RNA (ADARs) are involved in RNA editing that converts adenosines to inosines in double-stranded RNAs. ADAR1 was demonstrated to be functional on different viruses exerting either antiviral or proviral effects. Concerning HIV-1, several studies showed that ADAR1 favors viral replication. The aim of this study was to investigate the composition of the ADAR1 ribonucleoprotein complex during HIV-1 expression. By using a dual-tag affinity purification procedure in cells expressing HIV-1 followed by mass spectrometry analysis, we identified 14 non-ribosomal ADAR1-interacting proteins, most of which are novel. A significant fraction of these proteins were previously demonstrated to be associated to the Long INterspersed Element 1 (LINE1 or L1) ribonucleoparticles and to regulate the life cycle of L1 retrotransposons that continuously re-enter host-genome. Hence, we investigated the function of ADAR1 in the regulation of L1 activity. By using different cell-culture based retrotransposition assays in HeLa cells, we demonstrated a novel function of ADAR1 as suppressor of L1 retrotransposition. Apparently, this inhibitory mechanism does not occur through ADAR1 editing activity. Furthermore, we showed that ADAR1 binds the basal L1 RNP complex. Overall, these data support the role of ADAR1 as regulator of L1 life cycle.
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Affiliation(s)
- Elisa Orecchini
- Department of Biomedicine and Prevention, University of Rome 'Tor Vergata', Via Montpellier 1, Rome 00133, Italy
| | - Margherita Doria
- Laboratory of Immunoinfectivology, Bambino Gesù Children's Hospital, IRCCS, Piazza S. Onofrio 4, Rome 00165, Italy
| | - Ambra Antonioni
- Department of Biomedicine and Prevention, University of Rome 'Tor Vergata', Via Montpellier 1, Rome 00133, Italy
| | - Silvia Galardi
- Department of Biomedicine and Prevention, University of Rome 'Tor Vergata', Via Montpellier 1, Rome 00133, Italy
| | - Silvia Anna Ciafrè
- Department of Biomedicine and Prevention, University of Rome 'Tor Vergata', Via Montpellier 1, Rome 00133, Italy
| | - Loredana Frassinelli
- Department of Biomedicine and Prevention, University of Rome 'Tor Vergata', Via Montpellier 1, Rome 00133, Italy
| | - Carmine Mancone
- Istituto Pasteur-Fondazione Cenci Bolognetti, Department of Cellular Biotechnologies and Haematology, Sapienza University of Rome, Italy.,L. Spallanzani National Institute for Infectious Diseases, IRCCS, via Portuense 292, Rome 00149, Italy
| | - Claudia Montaldo
- L. Spallanzani National Institute for Infectious Diseases, IRCCS, via Portuense 292, Rome 00149, Italy
| | - Marco Tripodi
- Istituto Pasteur-Fondazione Cenci Bolognetti, Department of Cellular Biotechnologies and Haematology, Sapienza University of Rome, Italy.,L. Spallanzani National Institute for Infectious Diseases, IRCCS, via Portuense 292, Rome 00149, Italy
| | - Alessandro Michienzi
- Department of Biomedicine and Prevention, University of Rome 'Tor Vergata', Via Montpellier 1, Rome 00133, Italy
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Li YL, Chandrasekaran V, Carter SD, Woodward CL, Christensen DE, Dryden KA, Pornillos O, Yeager M, Ganser-Pornillos BK, Jensen GJ, Sundquist WI. Primate TRIM5 proteins form hexagonal nets on HIV-1 capsids. eLife 2016; 5. [PMID: 27253068 PMCID: PMC4936896 DOI: 10.7554/elife.16269] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 05/19/2016] [Indexed: 12/04/2022] Open
Abstract
TRIM5 proteins are restriction factors that block retroviral infections by binding viral capsids and preventing reverse transcription. Capsid recognition is mediated by C-terminal domains on TRIM5α (SPRY) or TRIMCyp (cyclophilin A), which interact weakly with capsids. Efficient capsid recognition also requires the conserved N-terminal tripartite motifs (TRIM), which mediate oligomerization and create avidity effects. To characterize how TRIM5 proteins recognize viral capsids, we developed methods for isolating native recombinant TRIM5 proteins and purifying stable HIV-1 capsids. Biochemical and EM analyses revealed that TRIM5 proteins assembled into hexagonal nets, both alone and on capsid surfaces. These nets comprised open hexameric rings, with the SPRY domains centered on the edges and the B-box and RING domains at the vertices. Thus, the principles of hexagonal TRIM5 assembly and capsid pattern recognition are conserved across primates, allowing TRIM5 assemblies to maintain the conformational plasticity necessary to recognize divergent and pleomorphic retroviral capsids. DOI:http://dx.doi.org/10.7554/eLife.16269.001 After infecting a cell, a virus reproduces by forcing the cell to produce new copies of the virus, which then spread to other cells. However, cells have evolved ways to fight back against these infections. For example, many mammalian cells contain proteins called restriction factors that prevent the virus from multiplying. The TRIM5 proteins form one common set of restriction factors that act against a class of viruses called retroviruses. HIV-1 and related retroviruses have a protein shell known as a capsid that surrounds the genetic material of the virus. The capsid contains several hundred repeating units, each of which consists of a hexagonal ring of six CA proteins. Although this basic pattern is maintained across different retroviruses, the overall shape of the capsids can vary considerably. For instance, HIV-1 capsids are shaped like a cone, but other retroviruses can form cylinders or spheres. Soon after the retrovirus enters a mammalian cell, TRIM5 proteins bind to the capsid. This causes the capsid to be destroyed, which prevents viral replication. Previous research has shown that several TRIM5 proteins must link up with each other via a region of their structure called the B-box 2 domain in order to efficiently recognize capsids. How this assembly process occurs, and why it enables the TRIM5 proteins to recognize different capsids was not fully understood. Now, Li, Chandrasekaran et al. (and independently Wagner et al.) have investigated these questions. Using biochemical analyses and electron microscopy, Li, Chandrasekaran et al. found that TRIM5 proteins can bind directly to the surface of HIV-1 capsids. Several TRIM5 proteins link together to form large hexagonal nets, in which the B-box domains of the proteins are found at the points where three TRIM5 proteins meet. This arrangement mimics the pattern present in the HIV-1 capsid, and just a few TRIM5 rings can cover most of the capsid. Li, Chandrasekaran et al. then analysed TRIM5 proteins from several primates, including rhesus macaques, African green monkeys and chimpanzees. In all cases analyzed, the TRIM5 proteins assembled into hexagonal nets, although the individual units within the net did not have strictly regular shapes. These results suggest that TRIM5 proteins assemble a scaffold that can deform to match the pattern of the proteins in the capsid. Further work is now needed to understand how capsid recognition is linked to the processes that disable the virus. DOI:http://dx.doi.org/10.7554/eLife.16269.002
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Affiliation(s)
- Yen-Li Li
- Department of Biochemistry, University of Utah, Salt Lake City, United States
| | | | - Stephen D Carter
- Division of Biology, California Institute of Technology, Pasadena, United States
| | - Cora L Woodward
- Division of Biology, California Institute of Technology, Pasadena, United States
| | - Devin E Christensen
- Department of Biochemistry, University of Utah, Salt Lake City, United States
| | - Kelly A Dryden
- Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, United States
| | - Owen Pornillos
- Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, United States
| | - Mark Yeager
- Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, United States.,Department of Medicine, Division of Cardiovascular Medicine, University of Virginia Health System, Charlottesville, United States
| | - Barbie K Ganser-Pornillos
- Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, United States
| | - Grant J Jensen
- Division of Biology, California Institute of Technology, Pasadena, United States.,Howard Hughes Medical Institute, California Institute of Technology, Pasadena, United States
| | - Wesley I Sundquist
- Department of Biochemistry, University of Utah, Salt Lake City, United States
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28
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Feng M, Dai M, Xie T, Li Z, Shi M, Zhang X. Innate Immune Responses in ALV-J Infected Chicks and Chickens with Hemangioma In Vivo. Front Microbiol 2016; 7:786. [PMID: 27252695 PMCID: PMC4879323 DOI: 10.3389/fmicb.2016.00786] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Accepted: 05/09/2016] [Indexed: 12/15/2022] Open
Abstract
Avian leukosis virus subgroup J (ALV-J) infection can cause tumors and immunosuppression. Since the precise mechanism of the innate immune response induced by ALV-J is unknown, we investigated the antiviral innate immune responses induced by ALV-J in chicks and chickens that had developed tumors. Spleen levels of interleukin-6 (IL-6), IL-10, IL-1β, and interferon-β (IFN-β) were not significantly different between the infected chick groups and the control groups from 1 day post hatch to 7 days post hatch. However, IL-6, IL-1β, and IFN-β protein levels in the three clinical samples with hemangiomas were dramatically increased compared to the healthy samples. In addition, the anti-inflammatory cytokine IL-10 increased sharply in two of three clinical samples. We also found a more than 20-fold up-regulation of ISG12-1 mRNA at 1 day post infection (d.p.i.) and a twofold up-regulation of ZC3HAV1 mRNA at 4 d.p.i. However, there were no statistical differences in ISG12-1 and ZC3HAV1 mRNA expression levels in the tumorigenesis phase. ALV-J infection induced a significant increase of Toll-like receptor 7 (TLR-7) at 1 d.p.i. and dramatically increased the mRNA levels of melanoma differentiation-associated gene 5 (MDA5) in the tumorigenesis phase. Moreover, the protein levels of interferon regulatory factor 1 (IRF-1) and signal transducer and activator of transcription 1 (STAT1) were decreased in chickens with tumors. These results suggest that ALV-J was primarily recognized by chicken TLR7 and MDA5 at early and late in vivo infection stages, respectively. ALV-J strain SCAU-HN06 did not induce any significant antiviral innate immune response in 1 week old chicks. However, interferon-stimulated genes were not induced normally during the late phase of ALV-J infection due to a reduction of IRF1 and STAT1 expression.
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Affiliation(s)
- Min Feng
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science, South China Agricultural UniversityGuangzhou, China; Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding and Key Lab of Chicken Genetics, Breeding and Reproduction, Ministry of AgricultureGuangzhou, China
| | - Manman Dai
- College of Veterinary Medicine, South China Agricultural University Guangzhou, China
| | - Tingting Xie
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science, South China Agricultural UniversityGuangzhou, China; Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding and Key Lab of Chicken Genetics, Breeding and Reproduction, Ministry of AgricultureGuangzhou, China
| | - Zhenhui Li
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science, South China Agricultural UniversityGuangzhou, China; Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding and Key Lab of Chicken Genetics, Breeding and Reproduction, Ministry of AgricultureGuangzhou, China
| | - Meiqing Shi
- Division of Immunology, Virginia-Maryland Regional College of Veterinary Medicine, University of Maryland, College Park MD, USA
| | - Xiquan Zhang
- Department of Animal Genetics, Breeding and Reproduction, College of Animal Science, South China Agricultural UniversityGuangzhou, China; Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding and Key Lab of Chicken Genetics, Breeding and Reproduction, Ministry of AgricultureGuangzhou, China
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29
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Abstract
Tumor cells actively produce, release, and utilize exosomes to promote tumor growth. Mechanisms through which tumor-derived exosomes subserve the tumor are under intense investigation. These exosomes are information carriers, conveying molecular and genetic messages from tumor cells to normal or other abnormal cells residing at close or distant sites. Tumor-derived exosomes are found in all body fluids. Upon contact with target cells, they alter phenotypic and functional attributes of recipients, reprogramming them into active contributors to angiogenesis, thrombosis, metastasis, and immunosuppression. Exosomes produced by tumors carry cargos that in part mimic contents of parent cells and are of potential interest as noninvasive biomarkers of cancer. Their role in inhibiting the host antitumor responses and in mediating drug resistance is important for cancer therapy. Tumor-derived exosomes may interfere with cancer immunotherapy, but they also could serve as adjuvants and antigenic components of antitumor vaccines. Their biological roles in cancer development or progression as well as cancer therapy suggest that tumor-derived exosomes are critical components of oncogenic transformation.
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Affiliation(s)
- Theresa L Whiteside
- University of Pittsburgh School of Medicine, University of Pittsburgh Cancer Institute, Pittsburgh, PA, United States.
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30
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Suppression of Type I Interferon Production by Human T-Cell Leukemia Virus Type 1 Oncoprotein Tax through Inhibition of IRF3 Phosphorylation. J Virol 2016; 90:3902-3912. [PMID: 26819312 DOI: 10.1128/jvi.00129-16] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 01/24/2016] [Indexed: 12/21/2022] Open
Abstract
UNLABELLED Infection with human T-cell leukemia virus type 1 (HTLV-1) is associated with adult T-cell leukemia (ATL) and tropical spastic paraparesis. Type I interferons (IFNs) are key effectors of the innate antiviral response, and IFN-α combined with the nucleoside reverse transcriptase inhibitor zidovudine is considered the standard first-line therapy for ATL. HTLV-1 oncoprotein Tax is known to suppress innate IFN production and response but the underlying mechanisms remain to be fully established. In this study, we report on the suppression of type I IFN production by HTLV-1 Tax through interaction with and inhibition of TBK1 kinase that phosphorylates IRF3. Induced transcription of IFN-β was severely impaired in HTLV-1-transformed ATL cells and freshly infected T lymphocytes. The ability to suppress IRF3 activation was ascribed to Tax. The expression of Tax alone sufficiently repressed the induction of IFN production by RIG-I plus PACT, cGAMP synthase plus STING, TBK1, IKKε, IRF3, and IRF7, but not by IRF3-5D, a dominant-active phosphomimetic mutant. This suggests that Tax perturbs IFN production at the step of IRF3 phosphorylation. Tax mutants deficient for CREB or NF-κB activation were fully competent in the suppression of IFN production. Coimmunoprecipitation experiments confirmed the association of Tax with TBK1, IKKε, STING, and IRF3.In vitrokinase assay indicated an inhibitory effect of Tax on TBK1-mediated phosphorylation of IRF3. Taken together, our findings suggested a new mechanism by which HTLV-1 oncoprotein Tax circumvents the production of type I IFNs in infected cells. Our findings have implications in therapeutic intervention of ATL. IMPORTANCE Human T-cell leukemia virus type 1 (HTLV-1) is the cause of adult T-cell leukemia (ATL), an aggressive and fatal blood cancer, as well as another chronic disabling disease of the spinal cord. Treatments are unsatisfactory, and options are limited. A combination of antiviral cellular protein alpha interferon and zidovudine, which is an inhibitor of a viral enzyme called reverse transcriptase, has been recommended as the standard first-line therapy for ATL. Exactly how HTLV-1 interacts with the cellular machinery for interferon production and action is not well understood. Our work sheds light on the mechanism of action for the inhibition of interferon production by an HTLV-1 oncogenic protein called Tax. Our findings might help to improve interferon-based anti-HTLV-1 and anti-ATL therapy.
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31
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Portilho DM, Fernandez J, Ringeard M, Machado AK, Boulay A, Mayer M, Müller-Trutwin M, Beignon AS, Kirchhoff F, Nisole S, Arhel NJ. Endogenous TRIM5α Function Is Regulated by SUMOylation and Nuclear Sequestration for Efficient Innate Sensing in Dendritic Cells. Cell Rep 2015; 14:355-69. [PMID: 26748714 PMCID: PMC4713866 DOI: 10.1016/j.celrep.2015.12.039] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 10/20/2015] [Accepted: 12/06/2015] [Indexed: 01/03/2023] Open
Abstract
During retroviral infection, viral capsids are subject to restriction by the cellular factor TRIM5α. Here, we show that dendritic cells (DCs) derived from human and non-human primate species lack efficient TRIM5α-mediated retroviral restriction. In DCs, endogenous TRIM5α accumulates in nuclear bodies (NB) that partly co-localize with Cajal bodies in a SUMOylation-dependent manner. Nuclear sequestration of TRIM5α allowed potent induction of type I interferon (IFN) responses during infection, mediated by sensing of reverse transcribed DNA by cGAS. Overexpression of TRIM5α or treatment with the SUMOylation inhibitor ginkgolic acid (GA) resulted in enforced cytoplasmic TRIM5α expression and restored efficient viral restriction but abrogated type I IFN production following infection. Our results suggest that there is an evolutionary trade-off specific to DCs in which restriction is minimized to maximize sensing. TRIM5α regulation via SUMOylation-dependent nuclear sequestration adds to our understanding of how restriction factors are regulated. Primate dendritic cells (DCs) lack efficient TRIM5α-mediated retroviral restriction In DCs TRIM5α is sequestered in the nucleus in a SUMOylation-dependent manner TRIM5α nuclear sequestration allows DC sensing of retroviral DNA by cGAS
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Affiliation(s)
- Débora M Portilho
- INSERM U941, University Institute of Hematology, Saint-Louis Hospital, 75010 Paris, France
| | - Juliette Fernandez
- INSERM U941, University Institute of Hematology, Saint-Louis Hospital, 75010 Paris, France
| | | | - Anthony K Machado
- INSERM U941, University Institute of Hematology, Saint-Louis Hospital, 75010 Paris, France
| | - Aude Boulay
- INSERM U941, University Institute of Hematology, Saint-Louis Hospital, 75010 Paris, France
| | - Martha Mayer
- Institute of Molecular Virology, Ulm University Medical Center, 89081 Ulm, Germany
| | | | - Anne-Sophie Beignon
- CEA-iMETI/Division of Immuno-Virology, Université Paris Sud, INSERM U1184, 92260 Fontenay-aux-Roses, France
| | - Frank Kirchhoff
- Institute of Molecular Virology, Ulm University Medical Center, 89081 Ulm, Germany
| | - Sébastien Nisole
- INSERM UMR-S 1124, Université Paris Descartes, 75006 Paris, France
| | - Nathalie J Arhel
- INSERM U941, University Institute of Hematology, Saint-Louis Hospital, 75010 Paris, France.
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32
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Innate immunity against HIV-1 infection. Nat Immunol 2015; 16:554-62. [PMID: 25988887 DOI: 10.1038/ni.3157] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Accepted: 03/25/2015] [Indexed: 02/06/2023]
Abstract
During acute HIV-1 infection, viral pathogen-associated molecular patterns are recognized by pathogen-recognition receptors (PRRs) of infected cells, which triggers a signaling cascade that initiates innate intracellular antiviral defenses aimed at restricting the replication and spread of the virus. This cell-intrinsic response propagates outward via the action of secreted factors such as cytokines and chemokines that activate innate immune cells and attract them to the site of infection and to local lymphatic tissue. Antiviral innate effector cells can subsequently contribute to the control of viremia and modulate the quality of the adaptive immune response to HIV-1. The concerted actions of PRR signaling, specific viral-restriction factors, innate immune cells, innate-adaptive immune crosstalk and viral evasion strategies determine the outcome of HIV-1 infection and immune responses.
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Coccia EM, Battistini A. Early IFN type I response: Learning from microbial evasion strategies. Semin Immunol 2015; 27:85-101. [PMID: 25869307 PMCID: PMC7129383 DOI: 10.1016/j.smim.2015.03.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2014] [Accepted: 03/10/2015] [Indexed: 12/12/2022]
Abstract
Type I interferon (IFN) comprises a class of cytokines first discovered more than 50 years ago and initially characterized for their ability to interfere with viral replication and restrict locally viral propagation. As such, their induction downstream of germ-line encoded pattern recognition receptors (PRRs) upon recognition of pathogen-associated molecular patterns (PAMPs) is a hallmark of the host antiviral response. The acknowledgment that several PAMPs, not just of viral origin, may induce IFN, pinpoints at these molecules as a first line of host defense against a number of invading pathogens. Acting in both autocrine and paracrine manner, IFN interferes with viral replication by inducing hundreds of different IFN-stimulated genes with both direct anti-pathogenic as well as immunomodulatory activities, therefore functioning as a bridge between innate and adaptive immunity. On the other hand an inverse interference to escape the IFN system is largely exploited by pathogens through a number of tactics and tricks aimed at evading, inhibiting or manipulating the IFN pathway, that result in progression of infection or establishment of chronic disease. In this review we discuss the interplay between the IFN system and some selected clinically important and challenging viruses and bacteria, highlighting the wide array of pathogen-triggered molecular mechanisms involved in evasion strategies.
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Affiliation(s)
- Eliana M Coccia
- Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena, 299, Rome 00161, Italy
| | - Angela Battistini
- Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena, 299, Rome 00161, Italy.
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34
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Capobianchi MR, Uleri E, Caglioti C, Dolei A. Type I IFN family members: similarity, differences and interaction. Cytokine Growth Factor Rev 2015; 26:103-11. [PMID: 25466633 PMCID: PMC7108279 DOI: 10.1016/j.cytogfr.2014.10.011] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 10/22/2014] [Indexed: 02/07/2023]
Abstract
Interferons (IFN) are key cytokines with multifaceted antiviral and cell-modulatory properties. Three distinct types of IFN are recognized (I-III) based on structural features, receptor usage, cellular source and biological activities. The action of IFNs is mediated by a complex, partially overlapping, transcriptional program initiated by the interaction with specific receptors. Genetic diversity, with polymorphisms and mutations, can modulate the extent of IFN responses and the susceptibility to infections. Almost all viruses developed mechanisms to subvert the IFN response, involving both IFN induction and effector mechanisms. Interactions between IFN types may occur, for both antiviral and cell-modulatory effects, in a complex interplay, involving both synergistic and antagonistic effects. Interferon-associated diseases, not related to virus infections may occur, some of them frequently observed in IFN-treated patients. On the whole, IFNs are pleiotropic biologic response modifiers, that, upon activation of thousands genes, induce a broad spectrum of activities, regulating cell cycle, differentiation, plasma membrane molecules, release of mediators, etc., that can be relevant for cell proliferation, innate and adaptive immunity, hematopoiesis, angiogenesis and other body functions.
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Affiliation(s)
- Maria Rosaria Capobianchi
- Laboratory of Virology, National Institute for Infectious Diseases "L. Spallanzani", Via Portuense 292, Rome, Italy
| | - Elena Uleri
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | - Claudia Caglioti
- Laboratory of Virology, National Institute for Infectious Diseases "L. Spallanzani", Via Portuense 292, Rome, Italy
| | - Antonina Dolei
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy.
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35
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Wang Q, Liu X, Cui Y, Tang Y, Chen W, Li S, Yu H, Pan Y, Wang C. The E3 Ubiquitin Ligase AMFR and INSIG1 Bridge the Activation of TBK1 Kinase by Modifying the Adaptor STING. Immunity 2014; 41:919-33. [DOI: 10.1016/j.immuni.2014.11.011] [Citation(s) in RCA: 233] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Accepted: 11/25/2014] [Indexed: 01/23/2023]
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36
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Acchioni C, Marsili G, Perrotti E, Remoli AL, Sgarbanti M, Battistini A. Type I IFN--a blunt spear in fighting HIV-1 infection. Cytokine Growth Factor Rev 2014; 26:143-58. [PMID: 25466629 DOI: 10.1016/j.cytogfr.2014.10.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 10/22/2014] [Indexed: 02/07/2023]
Abstract
For more than 50 years, Type I Interferon (IFN) has been recognized as critical in controlling viral infections. IFN is produced downstream germ-line encoded pattern recognition receptors (PRRs) upon engagement by pathogen-associated molecular patterns (PAMPs). As a result, hundreds of different interferon-stimulated genes (ISGs) are rapidly induced, acting in both autocrine and paracrine manner to build a barrier against viral replication and spread. ISGs encode proteins with direct antiviral and immunomodulatory activities affecting both innate and adaptive immune responses. During infection with viruses, as HIV-1, that can establish a persistent infection, IFN although produced, is not able to block the initial infection and a chronic IFN-mediated immune activation/inflammation becomes a pathogenic mechanism of disease progression. This review will briefly summarize when and how IFN is produced during HIV-1 infection and the way this innate immune response is manipulated by the virus to its own advantage to drive chronic immune activation and progression to AIDS.
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Affiliation(s)
- Chiara Acchioni
- Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena, 299, Rome 00161, Italy
| | - Giulia Marsili
- Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena, 299, Rome 00161, Italy
| | - Edvige Perrotti
- Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena, 299, Rome 00161, Italy
| | - Anna Lisa Remoli
- Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena, 299, Rome 00161, Italy
| | - Marco Sgarbanti
- Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena, 299, Rome 00161, Italy
| | - Angela Battistini
- Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Viale Regina Elena, 299, Rome 00161, Italy.
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