2024
CD4 downregulation precedes Env expression and protects HIV-1-infected cells from ADCC mediated by non-neutralizing antibodies
Richard J, Sannier G, Zhu L, Prévost J, Marchitto L, Benlarbi M, Beaudoin-Bussières G, Kim H, Sun Y, Chatterjee D, Medjahed H, Bourassa C, Delgado G, Dubé M, Kirchhoff F, Hahn B, Kumar P, Kaufmann D, Finzi A. CD4 downregulation precedes Env expression and protects HIV-1-infected cells from ADCC mediated by non-neutralizing antibodies. MBio 2024, 15: e01827-24. PMID: 39373535, PMCID: PMC11559134, DOI: 10.1128/mbio.01827-24.Peer-Reviewed Original ResearchAntibody-dependent cellular cytotoxicityProductively infected cellsEnv-CD4 interactionNon-neutralizing antibodiesHIV-1CD4 downmodulationEnv expressionCellular cytotoxicityResistance to antibody-dependent cellular cytotoxicityHIV-1-infected humanized miceInfected cellsHIV-1 cure strategiesHIV-1 mRNA expressionHIV-1-infected cellsCD4+ T cellsHIV-1 envelope glycoproteinMRNA expressionADCC-mediating antibodiesNon-neutralizing AbsCell surface CD4HIV-1 isolatesImmunotherapy-based strategiesMultiparametric flow cytometryVirally infected cellsEffective immune response
2022
HIV-1 Vpu restricts Fc-mediated effector functions in vivo
Prévost J, Anand S, Rajashekar J, Zhu L, Richard J, Goyette G, Medjahed H, Gendron-Lepage G, Chen H, Chen Y, Horwitz J, Grunst M, Zolla-Pazner S, Haynes B, Burton D, Flavell R, Kirchhoff F, Hahn B, Smith A, Pazgier M, Nussenzweig M, Kumar P, Finzi A. HIV-1 Vpu restricts Fc-mediated effector functions in vivo. Cell Reports 2022, 41: 111624. PMID: 36351384, PMCID: PMC9703018, DOI: 10.1016/j.celrep.2022.111624.Peer-Reviewed Original ResearchConceptsAntibody-dependent cellular cytotoxicityEffector functionsFc-mediated effector functionsHIV-1-infected cellsWild-type virusCorrelates of protectionRV144 vaccine trialHIV-1 infectionNon-neutralizing antibodiesFc effector functionsCell surface CD4Viral envelope glycoproteinsViral loadHumanized miceHumoral responseVaccine trialsCellular cytotoxicityHIV-1 VpuVpu expressionEnvelope glycoproteinInfected cellsNnAbsVirusVpuAdministrationEngineered ACE2-Fc counters murine lethal SARS-CoV-2 infection through direct neutralization and Fc-effector activities
Chen Y, Sun L, Ullah I, Beaudoin-Bussières G, Anand SP, Hederman AP, Tolbert WD, Sherburn R, Nguyen DN, Marchitto L, Ding S, Wu D, Luo Y, Gottumukkala S, Moran S, Kumar P, Piszczek G, Mothes W, Ackerman ME, Finzi A, Uchil PD, Gonzalez FJ, Pazgier M. Engineered ACE2-Fc counters murine lethal SARS-CoV-2 infection through direct neutralization and Fc-effector activities. Science Advances 2022, 8: eabn4188. PMID: 35857504, PMCID: PMC9278865, DOI: 10.1126/sciadv.abn4188.Peer-Reviewed Original ResearchAngiotensin-converting enzyme 2Soluble angiotensin-converting enzyme 2Fc effector functionsSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2) receptorLethal SARS-CoV-2 infectionK18-hACE2 mouse modelSARS-CoV-2 infectionAntibody-dependent cellular cytotoxicitySARS-CoV-2 antiviralsFc effector activityCoV-2 infectionSARS-CoV-2 variantsHalf maximal inhibitory concentrationComplement depositionACE2-FcCellular cytotoxicityEnzyme 2Mouse modelTherapeutic activityInhibitory concentrationTherapeutic settingDirect neutralizationInfectionReceptorsEffect of neutralization
2021
Modulating HIV-1 envelope glycoprotein conformation to decrease the HIV-1 reservoir
Rajashekar JK, Richard J, Beloor J, Prévost J, Anand SP, Beaudoin-Bussières G, Shan L, Herndler-Brandstetter D, Gendron-Lepage G, Medjahed H, Bourassa C, Gaudette F, Ullah I, Symmes K, Peric A, Lindemuth E, Bibollet-Ruche F, Park J, Chen HC, Kaufmann DE, Hahn BH, Sodroski J, Pazgier M, Flavell RA, Smith AB, Finzi A, Kumar P. Modulating HIV-1 envelope glycoprotein conformation to decrease the HIV-1 reservoir. Cell Host & Microbe 2021, 29: 904-916.e6. PMID: 34019804, PMCID: PMC8214472, DOI: 10.1016/j.chom.2021.04.014.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsAntibodies, NeutralizingAntibody-Dependent Cell CytotoxicityAntiviral AgentsCD4 AntigensCD4-Positive T-LymphocytesCell LineEnv Gene Products, Human Immunodeficiency VirusEpitopesFemaleGlycoproteinsHEK293 CellsHIV InfectionsHIV-1HumansImmunoglobulin Fc FragmentsKiller Cells, NaturalMaleMiceMice, SCIDModels, AnimalProtein ConformationVirus ReplicationConceptsAntibody-dependent cellular cytotoxicityHIV-1 reservoirFc effector functionsViral reboundHumanized miceHIV-1HIV-1-infected individualsHIV-1-infected cellsAutologous HIV-1Natural killer cellsCD4-mimetic compoundsHIV-1 replicationSmall CD4-mimetic compoundsART interruptionFunctional cureNK cellsKiller cellsCellular cytotoxicityTherapeutic utilityInfected individualsCD4mcVirus reservoirMiceViral envelopeAntibody recognition