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Feist WN, Luna SE, Ben-Efraim K, Filsinger Interrante MV, Amorin NA, Johnston NM, Bruun TUJ, Ghanim HY, Lesch BJ, Dudek AM, Porteus MH. Combining Cell-Intrinsic and -Extrinsic Resistance to HIV-1 By Engineering Hematopoietic Stem Cells for CCR5 Knockout and B Cell Secretion of Therapeutic Antibodies. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.03.08.583956. [PMID: 38496600 PMCID: PMC10942466 DOI: 10.1101/2024.03.08.583956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Autologous transplantation of CCR5 null hematopoietic stem and progenitor cells (HSPCs) is the only known cure for HIV-1 infection. However, this treatment is limited because of the rarity of CCR5 -null matched donors, the morbidities associated with allogeneic transplantation, and the prevalence of HIV-1 strains resistant to CCR5 knockout (KO) alone. Here, we propose a one-time therapy through autologous transplantation of HSPCs genetically engineered ex vivo to produce both CCR5 KO cells and long-term secretion of potent HIV-1 inhibiting antibodies from B cell progeny. CRISPR-Cas9-engineered HSPCs maintain engraftment capacity and multi-lineage potential in vivo and can be engineered to express multiple antibodies simultaneously. Human B cells engineered to express each antibody secrete neutralizing concentrations capable of inhibiting HIV-1 pseudovirus infection in vitro . This work lays the groundwork for a potential one-time functional cure for HIV-1 through combining the long-term delivery of therapeutic antibodies against HIV-1 and the known efficacy of CCR5 KO HSPC transplantation.
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2
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Zhang C, Zaman LA, Poluektova LY, Gorantla S, Gendelman HE, Dash PK. Humanized Mice for Studies of HIV-1 Persistence and Elimination. Pathogens 2023; 12:879. [PMID: 37513726 PMCID: PMC10383313 DOI: 10.3390/pathogens12070879] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 06/06/2023] [Accepted: 06/23/2023] [Indexed: 07/30/2023] Open
Abstract
A major roadblock to achieving a cure for human immunodeficiency virus type one (HIV-1) is the persistence of latent viral infections in the cells and tissue compartments of an infected human host. Latent HIV-1 proviral DNA persists in resting memory CD4+ T cells and mononuclear phagocytes (MPs; macrophages, microglia, and dendritic cells). Tissue viral reservoirs of both cell types reside in the gut, lymph nodes, bone marrow, spleen, liver, kidney, skin, adipose tissue, reproductive organs, and brain. However, despite the identification of virus-susceptible cells, several limitations persist in identifying broad latent reservoirs in infected persons. The major limitations include their relatively low abundance, the precise identification of latently infected cells, and the lack of biomarkers for identifying latent cells. While primary MP and CD4+ T cells and transformed cell lines are used to interrogate mechanisms of HIV-1 persistence, they often fail to accurately reflect the host cells and tissue environments that carry latent infections. Given the host specificity of HIV-1, there are few animal models that replicate the natural course of viral infection with any precision. These needs underlie the importance of humanized mouse models as both valuable and cost-effective tools for studying viral latency and subsequently identifying means of eliminating it. In this review, we discuss the advantages and limitations of humanized mice for studies of viral persistence and latency with an eye toward using these models to test antiretroviral and excision therapeutics. The goals of this research are to use the models to address how and under which circumstances HIV-1 latency can be detected and eliminated. Targeting latent reservoirs for an ultimate HIV-1 cure is the task at hand.
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Affiliation(s)
| | | | | | | | | | - Prasanta K. Dash
- Department of Pharmacology and Experimental Neuroscience, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198, USA (S.G.)
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3
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Ertuna YI, Fallet B, Marx AF, Dimitrova M, Kastner AL, Wagner I, Merkler D, Pinschewer DD. Vectored antibody gene delivery restores host B and T cell control of persistent viral infection. Cell Rep 2021; 37:110061. [PMID: 34852228 DOI: 10.1016/j.celrep.2021.110061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 10/02/2021] [Accepted: 11/04/2021] [Indexed: 10/19/2022] Open
Abstract
Passive antibody therapy and vectored antibody gene delivery (VAGD) in particular offer an innovative approach to combat persistent viral diseases. Here, we exploit a small animal model to investigate synergies of VAGD with the host's endogenous immune defense for treating chronic viral infection. An adeno-associated virus (AAV) vector delivering the lymphocytic choriomeningitis virus (LCMV)-neutralizing antibody KL25 (AAV-KL25) establishes protective antibody titers for >200 days. When therapeutically administered to chronically infected immunocompetent wild-type mice, AAV-KL25 affords sustained viral load control. In contrast, viral mutational escape thwarts therapeutic AAV-KL25 effects when mice are unable to mount LCMV-specific antibody responses or lack CD8+ T cells. VAGD augments antiviral germinal center B cell and antibody-secreting cell responses and reduces inhibitory receptor expression on antiviral CD8+ T cells. These results indicate that VAGD fortifies host immune defense and synergizes with B cell and CD8 T cell responses to restore immune control of chronic viral infection.
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Affiliation(s)
- Yusuf I Ertuna
- University of Basel, Department of Biomedicine-Haus Petersplatz, Division of Experimental Virology, 4009 Basel, Switzerland
| | - Benedict Fallet
- University of Basel, Department of Biomedicine-Haus Petersplatz, Division of Experimental Virology, 4009 Basel, Switzerland
| | - Anna-Friederike Marx
- University of Basel, Department of Biomedicine-Haus Petersplatz, Division of Experimental Virology, 4009 Basel, Switzerland
| | - Mirela Dimitrova
- University of Basel, Department of Biomedicine-Haus Petersplatz, Division of Experimental Virology, 4009 Basel, Switzerland
| | - Anna Lena Kastner
- University of Basel, Department of Biomedicine-Haus Petersplatz, Division of Experimental Virology, 4009 Basel, Switzerland
| | - Ingrid Wagner
- Department of Pathology and Immunology, Geneva Faculty of Medicine, Geneva University Hospital, 1211 Geneva, Switzerland
| | - Doron Merkler
- Department of Pathology and Immunology, Geneva Faculty of Medicine, Geneva University Hospital, 1211 Geneva, Switzerland; Division of Clinical Pathology, Geneva University Hospital, 1211 Geneva, Switzerland
| | - Daniel D Pinschewer
- University of Basel, Department of Biomedicine-Haus Petersplatz, Division of Experimental Virology, 4009 Basel, Switzerland.
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4
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Sobia P, Archary D. Preventive HIV Vaccines-Leveraging on Lessons from the Past to Pave the Way Forward. Vaccines (Basel) 2021; 9:vaccines9091001. [PMID: 34579238 PMCID: PMC8472969 DOI: 10.3390/vaccines9091001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 09/01/2021] [Accepted: 09/03/2021] [Indexed: 12/05/2022] Open
Abstract
Almost four decades on, since the 1980’s, with hundreds of HIV vaccine candidates tested in both non-human primates and humans, and several HIV vaccines trials later, an efficacious HIV vaccine continues to evade us. The enormous worldwide genetic diversity of HIV, combined with HIV’s inherent recombination and high mutation rates, has hampered the development of an effective vaccine. Despite the advent of antiretrovirals as pre-exposure prophylaxis and preventative treatment, which have shown to be effective, HIV infections continue to proliferate, highlighting the great need for a vaccine. Here, we provide a brief history for the HIV vaccine field, with the most recent disappointments and advancements. We also provide an update on current passive immunity trials, testing proof of the concept of the most clinically advanced broadly neutralizing monoclonal antibodies for HIV prevention. Finally, we include mucosal immunity, the importance of vaccine-elicited immune responses and the challenges thereof in the most vulnerable environment–the female genital tract and the rectal surfaces of the gastrointestinal tract for heterosexual and men who have sex with men transmissions, respectively.
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Affiliation(s)
- Parveen Sobia
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Nelson Mandela School of Medicine, University of KwaZulu-Natal, Durban 4001, South Africa;
| | - Derseree Archary
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Nelson Mandela School of Medicine, University of KwaZulu-Natal, Durban 4001, South Africa;
- Department of Medical Microbiology, University of KwaZulu-Natal, Durban 4001, South Africa
- Correspondence: ; Tel.: +27-(0)-31-655-0540
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5
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Atkins AJ, Allen AG, Dampier W, Haddad EK, Nonnemacher MR, Wigdahl B. HIV-1 cure strategies: why CRISPR? Expert Opin Biol Ther 2021; 21:781-793. [PMID: 33331178 PMCID: PMC9777058 DOI: 10.1080/14712598.2021.1865302] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
INTRODUCTION Antiretroviral therapy (ART) has transformed prognoses for HIV-1-infected individuals but requires lifelong adherence to prevent viral resurgence. Targeted elimination or permanent deactivation of the latently infected reservoir harboring integrated proviral DNA, which drives viral rebound, is a major focus of HIV-1 research. AREAS COVERED This review covers the current approaches to developing curative strategies for HIV-1 that target the latent reservoir. Discussed herein are shock and kill, broadly neutralizing antibodies (bNAbs), block and lock, Chimeric antigen receptor (CAR) T cells, immune checkpoint modulation, clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (Cas9) coreceptor ablation, and CRISPR/Cas9 proviral excision. Emphasis is placed on CRISPR/Cas9 proviral excision/inactivation. Recent advances and future directions toward discovery and translation of HIV-1 therapeutics are discussed. EXPERT OPINION CRISPR/Cas9 proviral targeting fills a niche amongst HIV-1 cure strategies by directly targeting the integrated provirus without the necessity of an innate or adaptive immune response. Each strategy discussed in this review has shown promising results with the potential to yield curative or adjuvant therapies. CRISPR/Cas9 is singular among these in that it addresses the root of the problem, integrated proviral DNA, with the capacity to permanently remove or deactivate the source of HIV-1 recrudescence.
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Affiliation(s)
- Andrew J. Atkins
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Alexander G. Allen
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Will Dampier
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Elias K. Haddad
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA,Division of Infectious Diseases and HIV Medicine, Department of Medicine, Drexel University College of Medicine, Philadelphia, PA 19129, USA,Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Michael R. Nonnemacher
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA 19129, USA,Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Brian Wigdahl
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA 19129, USA,Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA,Correspondence should be addressed to B.W. (), 245 N 15th St, Rm 18301, MS1013A, Philadelphia, PA, 19102, Tel: 215-991-8352, Fax: 215-849-4808
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6
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Abeynaike S, Paust S. Humanized Mice for the Evaluation of Novel HIV-1 Therapies. Front Immunol 2021; 12:636775. [PMID: 33868262 PMCID: PMC8047330 DOI: 10.3389/fimmu.2021.636775] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 03/01/2021] [Indexed: 12/13/2022] Open
Abstract
With the discovery of antiretroviral therapy, HIV-1 infection has transitioned into a manageable but chronic illness, which requires lifelong treatment. Nevertheless, complete eradication of the virus has still eluded us. This is partly due to the virus’s ability to remain in a dormant state in tissue reservoirs, ‘hidden’ from the host’s immune system. Also, the high mutation rate of HIV-1 results in escape mutations in response to many therapeutics. Regardless, the development of novel cures for HIV-1 continues to move forward with a range of approaches from immunotherapy to gene editing. However, to evaluate in vivo pathogenesis and the efficacy and safety of therapeutic approaches, a suitable animal model is necessary. To this end, the humanized mouse was developed by McCune in 1988 and has continued to be improved on over the past 30 years. Here, we review the variety of humanized mouse models that have been utilized through the years and describe their specific contribution in translating HIV-1 cure strategies to the clinic.
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Affiliation(s)
- Shawn Abeynaike
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA, United States.,The Skaggs Graduate Program in Chemical and Biological Sciences, The Scripps Research Institute, La Jolla, CA, United States
| | - Silke Paust
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA, United States.,The Skaggs Graduate Program in Chemical and Biological Sciences, The Scripps Research Institute, La Jolla, CA, United States
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7
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Muripiti V, Lohchania B, Ravula V, Manturthi S, Marepally S, Velidandi A, Patri SV. Dramatic influence of the hydroxy functionality of azasugar moiety in the head group region of tocopherol-based cationic lipids on in vitro gene transfection efficacies. NEW J CHEM 2021. [DOI: 10.1039/d0nj03717f] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Cationic lipids have been effectively used as nonviral vectors for the delivery of polynucleic acids into the cytosol.
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8
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Wise MC, Xu Z, Tello-Ruiz E, Beck C, Trautz A, Patel A, Elliott ST, Chokkalingam N, Kim S, Kerkau MG, Muthumani K, Jiang J, Fisher PD, Ramos SJ, Smith TR, Mendoza J, Broderick KE, Montefiori DC, Ferrari G, Kulp DW, Humeau LM, Weiner DB. In vivo delivery of synthetic DNA-encoded antibodies induces broad HIV-1-neutralizing activity. J Clin Invest 2020; 130:827-837. [PMID: 31697648 DOI: 10.1172/jci132779] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 10/24/2019] [Indexed: 02/06/2023] Open
Abstract
Interventions to prevent HIV-1 infection and alternative tools in HIV cure therapy remain pressing goals. Recently, numerous broadly neutralizing HIV-1 monoclonal antibodies (bNAbs) have been developed that possess the characteristics necessary for potential prophylactic or therapeutic approaches. However, formulation complexities, especially for multiantibody deliveries, long infusion times, and production issues could limit the use of these bNAbs when deployed, globally affecting their potential application. Here, we describe an approach utilizing synthetic DNA-encoded monoclonal antibodies (dmAbs) for direct in vivo production of prespecified neutralizing activity. We designed 16 different bNAbs as dmAb cassettes and studied their activity in small and large animals. Sera from animals administered dmAbs neutralized multiple HIV-1 isolates with activity similar to that of their parental recombinant mAbs. Delivery of multiple dmAbs to a single animal led to increased neutralization breadth. Two dmAbs, PGDM1400 and PGT121, were advanced into nonhuman primates for study. High peak-circulating levels (between 6 and 34 μg/ml) of these dmAbs were measured, and the sera of all animals displayed broad neutralizing activity. The dmAb approach provides an important local delivery platform for the in vivo generation of HIV-1 bNAbs and for other infectious disease antibodies.
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Affiliation(s)
- Megan C Wise
- Inovio Pharmaceuticals, Plymouth Meeting, Pennsylvania, USA
| | - Ziyang Xu
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA.,Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Edgar Tello-Ruiz
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA
| | | | - Aspen Trautz
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA
| | - Ami Patel
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA
| | - Sarah Tc Elliott
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA
| | - Neethu Chokkalingam
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA
| | - Sophie Kim
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA
| | | | - Kar Muthumani
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA
| | - Jingjing Jiang
- Inovio Pharmaceuticals, Plymouth Meeting, Pennsylvania, USA
| | - Paul D Fisher
- Inovio Pharmaceuticals, Plymouth Meeting, Pennsylvania, USA
| | | | | | - Janess Mendoza
- Inovio Pharmaceuticals, Plymouth Meeting, Pennsylvania, USA
| | | | - David C Montefiori
- Department of Surgery, Duke University School of Medicine, Durham, North Carolina, USA
| | | | - Daniel W Kulp
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA
| | | | - David B Weiner
- Vaccine and Immunotherapy Center, The Wistar Institute, Philadelphia, Pennsylvania, USA
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9
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Psomas CK, Salzwedel K, Stevenson M, Poli G, Routy JP, Margolis D, Chomont N, Lafeuillade A. Highlights of the 9th edition of the Conference on HIV Persistence During Therapy, 10-13 December 2019, Miami, USA. J Virus Erad 2020; 6:85-95. [PMID: 32405427 PMCID: PMC7213071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
| | - Karl Salzwedel
- National Institute of Allergy and Infectious Diseases, Bethesda, USA
| | | | - Guido Poli
- Division of Immunology, Transplantation and Infectious Diseases, San Raffaele Scientific Institute, Italy
| | | | - David Margolis
- University of North Carolina at Chapel Hill, Chapel Hill, USA
| | - Nicolas Chomont
- Centre de Recherche du CHUM and Department of Microbiology, Infectiology and Immunology, University of Montréal, Montreal, QC, Canada
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10
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Gardner MR. Promise and Progress of an HIV-1 Cure by Adeno-Associated Virus Vector Delivery of Anti-HIV-1 Biologics. Front Cell Infect Microbiol 2020; 10:176. [PMID: 32391289 PMCID: PMC7190809 DOI: 10.3389/fcimb.2020.00176] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 04/02/2020] [Indexed: 12/13/2022] Open
Abstract
Despite the success of antiretroviral therapy (ART) at suppressing HIV-1 infection, a cure that eradicates all HIV-1-infected cells has been elusive. The latent viral reservoir remains intact in tissue compartments that are not readily targeted by the host immune response that could accelerate the rate of reservoir decline during ART. However, over the past decade, numerous broadly neutralizing antibodies (bNAbs) have been discovered and characterized. These bNAbs have also given rise to engineered antibody-like inhibitors that are just as or more potent than bNAbs themselves. The question remains whether bNAbs and HIV-1 inhibitors will be the effective “kill” to a shock-and-kill approach to eliminate the viral reservoir. Additional research over the past few years has sought to develop recombinant adeno-associated virus (rAAV) vectors to circumvent the need for continual administration of bNAbs and maintain persistent expression in a host. This review discusses the advancements made in using rAAV vectors for the delivery of HIV-1 bNAbs and inhibitors and the future of this technology in HIV-1 cure research. Numerous groups have demonstrated with great efficacy that rAAV vectors can successfully express protective concentrations of bNAbs and HIV-1 inhibitors. Yet, therapeutic concentrations, especially in non-human primate (NHP) models, are not routinely achieved. As new studies have been reported, more challenges have been identified for utilizing rAAV vectors, specifically how the host immune response limits the attainable concentrations of bNAbs and inhibitors. The next few years should provide improvements to rAAV vector delivery that will ultimately show whether they can be used for expressing bNAbs and HIV-1 inhibitors to eliminate the HIV-1 viral reservoir.
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Affiliation(s)
- Matthew R Gardner
- Department of Immunology and Microbiology, The Scripps Research Institute, Jupiter, FL, United States
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11
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Agarwal Y, Beatty C, Biradar S, Castronova I, Ho S, Melody K, Bility MT. Moving beyond the mousetrap: current and emerging humanized mouse and rat models for investigating prevention and cure strategies against HIV infection and associated pathologies. Retrovirology 2020; 17:8. [PMID: 32276640 PMCID: PMC7149862 DOI: 10.1186/s12977-020-00515-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 03/31/2020] [Indexed: 12/22/2022] Open
Abstract
The development of safe and effective combination antiretroviral therapies for human immunodeficiency virus (HIV) infection over the past several decades has significantly reduced HIV-associated morbidity and mortality. Additionally, antiretroviral drugs have provided an effective means of protection against HIV transmission. Despite these advances, significant limitations exist; namely, the inability to eliminate HIV reservoirs, the inability to reverse lymphoid tissues damage, and the lack of an effective vaccine for preventing HIV transmission. Evaluation of the safety and efficacy of therapeutics and vaccines for eliminating HIV reservoirs and preventing HIV transmission requires robust in vivo models. Since HIV is a human-specific pathogen, that targets hematopoietic lineage cells and lymphoid tissues, in vivo animal models for HIV-host interactions require incorporation of human hematopoietic lineage cells and lymphoid tissues. In this review, we will discuss the construction of mouse models with human lymphoid tissues and/or hematopoietic lineage cells, termed, human immune system (HIS)-humanized mice. These HIS-humanized mouse models can support the development of functional human innate and adaptive immune cells, along with primary (thymus) and secondary (spleen) lymphoid tissues. We will discuss applications of HIS-humanized mouse models in evaluating the safety and efficacy of therapeutics against HIV reservoirs and associated immunopathology, and delineate the human immune response elicited by candidate HIV vaccines. In addition to focusing on how these HIS-humanized mouse models have already furthered our understanding of HIV and contributed to HIV therapeutics development, we discuss how emerging HIS-humanized rat models could address the limitations of HIS-mouse models.
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Affiliation(s)
- Yash Agarwal
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Cole Beatty
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Shivkumar Biradar
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Isabella Castronova
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Sara Ho
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA
| | - Kevin Melody
- Galveston National Laboratory and Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX, USA
| | - Moses Turkle Bility
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, USA.
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12
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Margolis DM, Archin NM, Cohen MS, Eron JJ, Ferrari G, Garcia JV, Gay CL, Goonetilleke N, Joseph SB, Swanstrom R, Turner AMW, Wahl A. Curing HIV: Seeking to Target and Clear Persistent Infection. Cell 2020; 181:189-206. [PMID: 32220311 PMCID: PMC7896558 DOI: 10.1016/j.cell.2020.03.005] [Citation(s) in RCA: 112] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 03/03/2020] [Accepted: 03/03/2020] [Indexed: 12/14/2022]
Abstract
Human immunodeficiency virus type 1 (HIV-1) infection persists despite years of antiretroviral therapy (ART). To remove the stigma and burden of chronic infection, approaches to eradicate or cure HIV infection are desired. Attempts to augment ART with therapies that reverse viral latency, paired with immunotherapies to clear infection, have advanced into the clinic, but the field is still in its infancy. We review foundational studies and highlight new insights in HIV cure research. Together with advances in ART delivery and HIV prevention strategies, future therapies that clear HIV infection may relieve society of the affliction of the HIV pandemic.
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Affiliation(s)
- David M Margolis
- UNC HIV Cure Center, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Medicine, Division of Infectious Diseases, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Microbiology and Immunology, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Epidemiology, University of North Carolina at Chapel Hill School of Public Health, Chapel Hill, NC 27599, USA.
| | - Nancie M Archin
- UNC HIV Cure Center, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Medicine, Division of Infectious Diseases, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
| | - Myron S Cohen
- Department of Medicine, Division of Infectious Diseases, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Institute for Global Health and Infectious Diseases, University of North Carolina, Chapel Hill, NC 27599, USA
| | - Joseph J Eron
- UNC HIV Cure Center, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Medicine, Division of Infectious Diseases, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
| | - Guido Ferrari
- Department of Surgery and Duke Human Vaccine Institute, Duke University Medical Center, Durham, NC 27710, USA
| | - J Victor Garcia
- International Center for the Advancement of Translational Science, Division of Infectious Diseases, Department of Medicine, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Center for AIDS Research, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
| | - Cynthia L Gay
- UNC HIV Cure Center, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Medicine, Division of Infectious Diseases, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
| | - Nilu Goonetilleke
- UNC HIV Cure Center, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Microbiology and Immunology, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
| | - Sarah B Joseph
- UNC HIV Cure Center, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Microbiology and Immunology, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Center for AIDS Research, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Ronald Swanstrom
- Center for AIDS Research, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Department of Biochemistry & Biophysics, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
| | - Anne-Marie W Turner
- UNC HIV Cure Center, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Department of Medicine, Division of Infectious Diseases, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
| | - Angela Wahl
- International Center for the Advancement of Translational Science, Division of Infectious Diseases, Department of Medicine, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA; Center for AIDS Research, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC 27599, USA
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13
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Highlights of the 9th edition of the Conference on HIV Persistence During Therapy, 10–13 December 2019, Miami, USA. J Virus Erad 2020. [DOI: 10.1016/s2055-6640(20)30022-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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14
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Liu Y, Cao W, Sun M, Li T. Broadly neutralizing antibodies for HIV-1: efficacies, challenges and opportunities. Emerg Microbes Infect 2020; 9:194-206. [PMID: 31985356 PMCID: PMC7040474 DOI: 10.1080/22221751.2020.1713707] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Combination antiretroviral therapy (cART) is effective but not curative, and no successful vaccine is currently available for human immunodeficiency virus-1 (HIV-1). Broadly neutralizing antibodies (bNAbs) provide a new approach to HIV-1 prevention and treatment, and these promising candidates advancing into clinical trials have shown certain efficacies in infected individuals. In addition, bNAbs have the potential to kill HIV-1-infected cells and to affect the course of HIV-1 infection by directly engaging host immunity. Nonetheless, challenges accompany the use of bNAbs, including transient suppression of viraemia, frequent emergence of resistant viruses in rebound viraemia, suboptimal efficacy in virus cell-to-cell transmission, and unclear effects on the cell-associated HIV-1 reservoir. In this review, we discuss opportunities and potential strategies to address current challenges to promote the future use of immunotherapy regimens.
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Affiliation(s)
- Yubin Liu
- Department of Infectious Diseases, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, People’s Republic of China
| | - Wei Cao
- Department of Infectious Diseases, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, People’s Republic of China
| | - Ming Sun
- Institute of Medical Biology, Chinese Academy of Medical Sciences, Kunming, People’s Republic of China,Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People’s Republic of China, Ming Sun Institute of Medical Biology, Chinese Academy of Medical Sciences, Kunming, People’s Republic of China Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People’s Republic of China
| | - Taisheng Li
- Department of Infectious Diseases, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, People’s Republic of China,Clinical Immunology Center, Chinese Academy of Medical Sciences, Beijing, People’s Republic of China,Tsinghua University Medical College, Beijing, People’s Republic of China,Taisheng Li Department of Infectious diseases, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, People’s Republic of China Clinical Immunology Center, Chinese Academy of Medical Sciences, Beijing, People’s Republic of China School of Medicine, Tsinghua University, Beijing, People’s Republic of China
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15
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Fischer K, Nguyen K, LiWang PJ. Griffithsin Retains Anti-HIV-1 Potency with Changes in gp120 Glycosylation and Complements Broadly Neutralizing Antibodies PGT121 and PGT126. Antimicrob Agents Chemother 2019; 64:e01084-19. [PMID: 31611356 PMCID: PMC7187567 DOI: 10.1128/aac.01084-19] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 09/19/2019] [Indexed: 11/20/2022] Open
Abstract
Griffithsin (Grft) is an antiviral lectin that has been shown to potently inhibit HIV-1 by binding high-mannose N-linked glycosylation sites on HIV-1 gp120. A key factor for Grft potency is glycosylation at N295 of gp120, which is directly adjacent to N332, a target glycan for an entire class of broadly neutralizing antibodies (bNAbs). Here, we unify previous work on the importance of other glycans to Grft potency against HIV-1 and Grft's role in mediating the conformational change of gp120 by mutating nearly every glycosylation site in gp120. In addition to a significant loss of Grft activity by the removal of glycosylation at N295, glycan absence at N332 or N448 was found to have moderate effects on Grft potency. Interestingly, in the absence of N295, Grft effectiveness could be improved by a mutation that results in the glycan at N448 shifting to N446, indicating that the importance of individual glycans may be related to their effect on glycosylation density. Grft's ability to alter the structure of gp120, exposing the CD4 binding site, correlated with the presence of glycosylation at N295 only in clade B strains, not clade C strains. We further demonstrate that Grft can rescue the activity of the bNAbs PGT121 and PGT126 in the event of a loss or a shift of glycosylation at N332, where the bNAbs suffer a drastic loss of potency. Despite targeting the same region, Grft in combination with PGT121 and PGT126 produced additive effects. This indicates that Grft could be an important combinational therapeutic.
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Affiliation(s)
- Kathryn Fischer
- Molecular Cell Biology, University of California, Merced, Merced, California, USA
| | - Kimberly Nguyen
- Molecular Cell Biology, University of California, Merced, Merced, California, USA
| | - Patricia J LiWang
- Molecular Cell Biology, University of California, Merced, Merced, California, USA
- Health Sciences Research Institute, University of California, Merced, Merced, California, USA
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16
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Abstract
Neutralizing antibodies against human immunodeficiency virus subtype 1 (HIV-1) bind to its envelope glycoprotein (Env). Half of the molecular mass of Env is carbohydrate making it one of the most heavily glycosylated proteins known in nature. HIV-1 Env glycans are derived from the host and present a formidable challenge for host anti-glycan antibody induction. Anti-glycan antibody induction is challenging because anti-HIV-1 glycan antibodies should recognize Env antigen while not acquiring autoreactivity. Thus, the glycan network on HIV-1 Env is referred to as the glycan shield. Despite the challenges presented by immune recognition of host-derived glycans, neutralizing antibodies capable of binding the glycans on HIV-1 Env can be generated by the host immune system in the setting of HIV-1 infection. In particular, a cluster of high mannose glycans, including an N-linked glycan at position 332, form the high mannose patch and are targeted by a variety of broadly neutralizing antibodies. These high mannose patch-directed HIV-1 antibodies can be categorized into distinct categories based on their antibody paratope structure, neutralization activity, and glycan and peptide reactivity. Below we will compare and contrast each of these classes of HIV-1 glycan-dependent antibodies and describe vaccine design efforts to elicit each of these antibody types.
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17
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Pu J, Wang Q, Xu W, Lu L, Jiang S. Development of Protein- and Peptide-Based HIV Entry Inhibitors Targeting gp120 or gp41. Viruses 2019; 11:v11080705. [PMID: 31374953 PMCID: PMC6722851 DOI: 10.3390/v11080705] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 07/26/2019] [Accepted: 07/26/2019] [Indexed: 01/08/2023] Open
Abstract
Application of highly active antiretroviral drugs (ARDs) effectively reduces morbidity and mortality in HIV-infected individuals. However, the emergence of multiple drug-resistant strains has led to the increased failure of ARDs, thus calling for the development of anti-HIV drugs with targets or mechanisms of action different from those of the current ARDs. The first peptide-based HIV entry inhibitor, enfuvirtide, was approved by the U.S. FDA in 2003 for treatment of HIV/AIDS patients who have failed to respond to the current ARDs, which has stimulated the development of several series of protein- and peptide-based HIV entry inhibitors in preclinical and clinical studies. In this review, we highlighted the properties and mechanisms of action for those promising protein- and peptide-based HIV entry inhibitors targeting the HIV-1 gp120 or gp41 and discussed their advantages and disadvantages, compared with the current ARDs.
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Affiliation(s)
- Jing Pu
- Shanghai Public Health Clinical Center and School of Basic Medical Sciences, Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Fudan University, Shanghai 200032, China
| | - Qian Wang
- Shanghai Public Health Clinical Center and School of Basic Medical Sciences, Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Fudan University, Shanghai 200032, China
| | - Wei Xu
- Shanghai Public Health Clinical Center and School of Basic Medical Sciences, Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Fudan University, Shanghai 200032, China
| | - Lu Lu
- Shanghai Public Health Clinical Center and School of Basic Medical Sciences, Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Fudan University, Shanghai 200032, China.
| | - Shibo Jiang
- Shanghai Public Health Clinical Center and School of Basic Medical Sciences, Key Laboratory of Medical Molecular Virology (MOE/NHC/CAMS), Fudan University, Shanghai 200032, China.
- Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY 10065, USA.
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18
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van den Berg FT, Makoah NA, Ali SA, Scott TA, Mapengo RE, Mutsvunguma LZ, Mkhize NN, Lambson BE, Kgagudi PD, Crowther C, Abdool Karim SS, Balazs AB, Weinberg MS, Ely A, Arbuthnot PB, Morris L. AAV-Mediated Expression of Broadly Neutralizing and Vaccine-like Antibodies Targeting the HIV-1 Envelope V2 Region. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2019; 14:100-112. [PMID: 31334303 PMCID: PMC6616373 DOI: 10.1016/j.omtm.2019.06.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 06/06/2019] [Indexed: 12/15/2022]
Abstract
HIV-1 infection continues to be a global health challenge and a vaccine is urgently needed. Broadly neutralizing antibodies (bNAbs) are considered essential as they inhibit multiple HIV-1 strains, but they are difficult to elicit by conventional immunization. In contrast, non-neutralizing antibodies that correlated with reduced risk of infection in the RV144 HIV vaccine trial are relatively easy to induce, but responses are not durable. To overcome these obstacles, adeno-associated virus (AAV) vectors were used to provide long-term expression of antibodies targeting the V2 region of the HIV-1 envelope protein, including the potent CAP256-VRC26.25 bNAb, as well as non-neutralizing CAP228 antibodies that resemble those elicited by vaccination. AAVs mediated effective antibody expression in cell culture and immunocompetent mice. Mean concentrations of human immunoglobulin G (IgG) in mouse sera increased rapidly following a single AAV injection, reaching 8–60 μg/mL for CAP256 antibodies and 44–220 μg/mL for CAP228 antibodies over 24 weeks, but antibody concentrations varied for individual mice. Secreted antibodies collected from serum retained the expected binding and neutralizing activity. The vectors generated here are, therefore, suitable for the delivery of V2-targeting HIV antibodies, and they could be used in a vectored immunoprophylaxis (VIP) approach to sustain the level of antibody expression required to prevent HIV infection.
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Affiliation(s)
- Fiona T van den Berg
- Wits-SAMRC Antiviral Gene Therapy Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.,HIV Pathogenesis Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Nigel A Makoah
- Centre for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2131, South Africa.,Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Stuart A Ali
- HIV Pathogenesis Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Tristan A Scott
- Wits-SAMRC Antiviral Gene Therapy Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.,HIV Pathogenesis Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Rutendo E Mapengo
- Centre for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2131, South Africa
| | - Lorraine Z Mutsvunguma
- HIV Pathogenesis Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Nonhlanhla N Mkhize
- Centre for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2131, South Africa
| | - Bronwen E Lambson
- Centre for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2131, South Africa
| | - Prudence D Kgagudi
- Centre for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2131, South Africa
| | - Carol Crowther
- Centre for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2131, South Africa
| | - Salim S Abdool Karim
- Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, Durban, South Africa.,Department of Epidemiology, Columbia University, New York, NY, USA
| | | | - Marc S Weinberg
- Wits-SAMRC Antiviral Gene Therapy Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.,HIV Pathogenesis Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Abdullah Ely
- Wits-SAMRC Antiviral Gene Therapy Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Patrick B Arbuthnot
- Wits-SAMRC Antiviral Gene Therapy Research Unit, Department of Molecular Medicine & Hematology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Lynn Morris
- Centre for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service, Johannesburg 2131, South Africa.,Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa.,Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, Durban, South Africa
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19
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Tsukamoto T. Gene Therapy Approaches to Functional Cure and Protection of Hematopoietic Potential in HIV Infection. Pharmaceutics 2019; 11:E114. [PMID: 30862061 PMCID: PMC6470728 DOI: 10.3390/pharmaceutics11030114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 03/05/2019] [Accepted: 03/06/2019] [Indexed: 12/28/2022] Open
Abstract
Although current antiretroviral drug therapy can suppress the replication of human immunodeficiency virus (HIV), a lifelong prescription is necessary to avoid viral rebound. The problem of persistent and ineradicable viral reservoirs in HIV-infected people continues to be a global threat. In addition, some HIV-infected patients do not experience sufficient T-cell immune restoration despite being aviremic during treatment. This is likely due to altered hematopoietic potential. To achieve the global eradication of HIV disease, a cure is needed. To this end, tremendous efforts have been made in the field of anti-HIV gene therapy. This review will discuss the concepts of HIV cure and relative viral attenuation and provide an overview of various gene therapy approaches aimed at a complete or functional HIV cure and protection of hematopoietic functions.
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Affiliation(s)
- Tetsuo Tsukamoto
- Department of Immunology, Kindai University Faculty of Medicine, Osaka 5898511, Japan.
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20
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Allen AG, Chung CH, Atkins A, Dampier W, Khalili K, Nonnemacher MR, Wigdahl B. Gene Editing of HIV-1 Co-receptors to Prevent and/or Cure Virus Infection. Front Microbiol 2018; 9:2940. [PMID: 30619107 PMCID: PMC6304358 DOI: 10.3389/fmicb.2018.02940] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 11/15/2018] [Indexed: 12/26/2022] Open
Abstract
Antiretroviral therapy has prolonged the lives of people living with human immunodeficiency virus type 1 (HIV-1), transforming the disease into one that can be controlled with lifelong therapy. The search for an HIV-1 vaccine has plagued researchers for more than three decades with little to no success from clinical trials. Due to these failures, scientists have turned to alternative methods to develop next generation therapeutics that could allow patients to live with HIV-1 without the need for daily medication. One method that has been proposed has involved the use of a number of powerful gene editing tools; Zinc Finger Nucleases (ZFN), Transcription Activator–like effector nucleases (TALENs), and Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR)/Cas9 to edit the co-receptors (CCR5 or CXCR4) required for HIV-1 to infect susceptible target cells efficiently. Initial safety studies in patients have shown that editing the CCR5 locus is safe. More in depth in vitro studies have shown that editing the CCR5 locus was able to inhibit infection from CCR5-utilizing virus, but CXCR4-utilizing virus was still able to infect cells. Additional research efforts were then aimed at editing the CXCR4 locus, but this came with other safety concerns. However, in vitro studies have since confirmed that CXCR4 can be edited without killing cells and can confer resistance to CXCR4-utilizing HIV-1. Utilizing these powerful new gene editing technologies in concert could confer cellular resistance to HIV-1. While the CD4, CCR5, CXCR4 axis for cell-free infection has been the most studied, there are a plethora of reports suggesting that the cell-to-cell transmission of HIV-1 is significantly more efficient. These reports also indicated that while broadly neutralizing antibodies are well suited with respect to blocking cell-free infection, cell-to-cell transmission remains refractile to this approach. In addition to stopping cell-free infection, gene editing of the HIV-1 co-receptors could block cell-to-cell transmission. This review aims to summarize what has been shown with regard to editing the co-receptors needed for HIV-1 entry and how they could impact the future of HIV-1 therapeutic and prevention strategies.
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Affiliation(s)
- Alexander G Allen
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States.,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Cheng-Han Chung
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States.,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Andrew Atkins
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States.,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Will Dampier
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States.,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, United States.,School of Biomedical Engineering and Health Systems, Drexel University, Philadelphia, PA, United States
| | - Kamel Khalili
- Department of Neuroscience, Center for Neurovirology, and Comprehensive NeuroAIDS Center, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, United States.,Center for Translational AIDS Research, Lewis Katz School of Medicine, Temple University, Philadelphia, PA, United States
| | - Michael R Nonnemacher
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States.,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, United States.,Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA, United States
| | - Brian Wigdahl
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA, United States.,Center for Molecular Virology and Translational Neuroscience, Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA, United States.,Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA, United States
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21
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Abstract
A large array of broadly neutralizing antibodies (bnAbs) against HIV have been isolated and described, particularly in the last decade. This continually expanding array of bnAbs has crucially led to the identification of novel epitopes on the HIV envelope protein via which antibodies can block a broad range of HIV strains. Moreover, these studies have produced high-resolution understanding of these sites of vulnerability on the envelope protein. They have also clarified the mechanisms of action of bnAbs and provided detailed descriptions of B cell ontogenies from which they arise. However, it is still not possible to predict which HIV-infected individuals will go onto develop breath nor is it possible to induce neutralization breadth by immunization in humans. This review aims to discuss the major insights gained so far and also to evaluate the requirement to continue isolating and characterizing new bnAbs. While new epitopes may remain to be uncovered, a clearer probable benefit of further bnAb characterization is a greater understanding of key decision points in bnAb development within the anti-HIV immune response. This in turn may lead to new insights into how to trigger bnAbs by immunization and more clearly define the challenges to using bnAbs as therapeutic agents.
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Affiliation(s)
- Laura E McCoy
- Division of Infection and Immunity, University College London, London, UK.
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22
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Sengupta S, Siliciano RF. Targeting the Latent Reservoir for HIV-1. Immunity 2018; 48:872-895. [PMID: 29768175 PMCID: PMC6196732 DOI: 10.1016/j.immuni.2018.04.030] [Citation(s) in RCA: 236] [Impact Index Per Article: 39.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 04/26/2018] [Accepted: 04/26/2018] [Indexed: 02/07/2023]
Abstract
Antiretroviral therapy can effectively block HIV-1 replication and prevent or reverse immunodeficiency in HIV-1-infected individuals. However, viral replication resumes within weeks of treatment interruption. The major barrier to a cure is a small pool of resting memory CD4+ T cells that harbor latent HIV-1 proviruses. This latent reservoir is now the focus of an intense international research effort. We describe how the reservoir is established, challenges involved in eliminating it, and pharmacologic and immunologic strategies for targeting this reservoir. The development of a successful cure strategy will most likely require understanding the mechanisms that maintain HIV-1 proviruses in a latent state and pathways that drive the proliferation of infected cells, which slows reservoir decay. In addition, a cure will require the development of effective immunologic approaches to eliminating infected cells. There is renewed optimism about the prospect of a cure, and the interventions discussed here could pave the way.
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Affiliation(s)
- Srona Sengupta
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Graduate Program in Immunology and Medical Scientist Training Program, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Robert F Siliciano
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA; Howard Hughes Medical Institute, Baltimore, MD 21205, USA.
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