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Moser B. Chemokine Receptor-Targeted Therapies: Special Case for CCR8. Cancers (Basel) 2022; 14:511. [PMID: 35158783 PMCID: PMC8833710 DOI: 10.3390/cancers14030511] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 01/09/2022] [Accepted: 01/17/2022] [Indexed: 11/16/2022] Open
Abstract
Immune checkpoint blockade inhibitors (CBIs) targeting cytotoxic T lymphocyte associated protein-4 (CTLA-4) and program death receptor-1 (PD-1) or its ligand-1 (PD-L1) have transformed the outlook of many patients with cancer. This remarkable progress has highlighted, from the translational point of view, the importance of immune cells in the control of tumor progression. There is still room for improvement, since current CBI therapies benefit a minority of patients. Moreover, interference with immune checkpoint receptors frequently causes immune related adverse events (irAEs) with life-threatening consequences in some of the patients. Immunosuppressive cells in the tumor microenvironment (TME), including intratumoral regulatory T (Treg) cells, tumor-associated macrophages (TAMs) and myeloid-derived suppressor cells (MDSCs), contribute to tumor progression and correlate with a negative disease outlook. Recent reports revealed the selective expression of the chemokine receptor CCR8 on tumor Treg cells, making CCR8 a promising target in translational research. In this review, I summarize our current knowledge about the cellular distribution and function of CCR8 in physiological and pathophysiological processes. The discussion includes an assessment of how the removal of CCR8-expressing cells might affect both anti-tumor immunity as well as immune homeostasis at remote sites. Based on these considerations, CCR8 appears to be a promising novel target to be considered in future translational research.
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Affiliation(s)
- Bernhard Moser
- Division of Infection & Immunity, Henry Wellcome Building, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
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2
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Lin F, Wang L, Duan Y, Li K, Zhou J, Guang Z, Wang Y, Yang M, Qin Q, Wang Q. Expression and subcellular analyses of CCR8a/b genes with the identification of response to SGIV viral infect in orange-spotted grouper (Epinephelus coioides). FISH & SHELLFISH IMMUNOLOGY 2020; 106:628-639. [PMID: 32853761 DOI: 10.1016/j.fsi.2020.08.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 08/02/2020] [Accepted: 08/19/2020] [Indexed: 06/11/2023]
Abstract
Chemokine receptors are a superfamily of seven transmembrane domain G-coupled receptors, and they play important roles in immune surveillance, inflammation, and development. Recently, nine CC chemokine receptors (CCRs) were identified and cloned from orange-spotted grouper (Epinephelus coioides) and annotated by phylogenetic and syntenic analyses. We detected mRNA transcripts for CCRs in healthy tissues of E. coioides, and CCR genes were highly expressed in the immune-relevant tissues. Analysis of gene expression after Singapore grouper iridovirus (SGIV) infection indicated that CCR genes are regulated in a gene-specific manner. CCR8a and CCR8b were significantly upregulated in the spleen and liver of resistant fish, indicating potential roles in immunity against the pathogen. Fluorescence microscopy revealed that CCR8a and CCR8b were expressed predominantly in the cytoplasm. Overexpression of CCR8a and CCR8b in grouper cells significantly inhibited the replication of SGIV, demonstrating that they delayed the occurrence of cytopathic effects induced by SGIV infection and inhibited viral gene transcription. CCR8a and CCR8b overexpression also significantly increased the expression of interferon (IFN)-related cytokines and activated IFN response element and IFN promoter activities. These results demonstrated that CCR8a and CCR8b might have an antiviral function against SGIV infect.
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Affiliation(s)
- Fangmei Lin
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Li Wang
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Yanchuang Duan
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Keqi Li
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Jingxin Zhou
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Zhi Guang
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Yuxin Wang
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Min Yang
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, People's Republic of China; Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, People's Republic of China.
| | - Qiwei Qin
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, People's Republic of China; Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, People's Republic of China.
| | - Qing Wang
- College of Marine Sciences, South China Agricultural University, Guangzhou, 510642, People's Republic of China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, People's Republic of China; Joint Laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation, People's Republic of China.
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3
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Agrawal M, Rastogi M, Dogra S, Pandey N, Basu A, Singh SK. Chandipura virus changes cellular miRNome in human microglial cells. J Med Virol 2019; 94:480-490. [PMID: 31017674 DOI: 10.1002/jmv.25491] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 04/17/2019] [Accepted: 04/21/2019] [Indexed: 12/16/2022]
Abstract
Chandipura virus (CHPV) is a neurotropic virus, known to cause encephalitis in humans. The microRNAs (miRNA/miR) play an important role in the pathogenesis of viral infection. The present study is focused on the role of miRNAs during CHPV (strain 1653514) infection in human microglial cells. The deep sequencing of CHPV-infected human microglial cells identified a total of 12 differentially expressed miRNA (DEMs). To elucidate the role of DEMs, the target gene prediction, Gene Ontology term (GO Term), pathway enrichment analysis, and miRNA-messenger RNA (mRNA) interaction network analysis was performed. The GO terms and pathway enrichment analysis provided 146 enriched genes; which were involved in interferon response, cytokine and chemokine signaling. Further, the WGCNA (weighted gene coexpression network analysis) of the enriched genes were discretely categorized into three modules (blue, brown, and turquoise). The hub genes in the blue module may correlate to CHPV induced neuroinflammation. Altogether, the miRNA-mRNA interaction network and WGCNA study revealed the following pairs, hsa-miR-542-3p and FAF1, hsa-miR-92a-1-5p and MYD88, and hsa-miR-3187-3p and TNFRSF21, which may contribute to neuroinflammation during CHPV infection in human microglial cells.
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Affiliation(s)
- Meghna Agrawal
- Molecular Biology Unit, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - Meghana Rastogi
- Molecular Biology Unit, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - Smriti Dogra
- Molecular Biology Unit, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - Neha Pandey
- Molecular Biology Unit, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - Anirban Basu
- Division of Cellular and Molecular Neuroscience, National Brain Research Centre, Manesar, India
| | - Sunit K Singh
- Molecular Biology Unit, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
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Berenguer J, Lagerweij T, Zhao XW, Dusoswa S, van der Stoop P, Westerman B, de Gooijer MC, Zoetemelk M, Zomer A, Crommentuijn MHW, Wedekind LE, López-López À, Giovanazzi A, Bruch-Oms M, van der Meulen-Muileman IH, Reijmers RM, van Kuppevelt TH, García-Vallejo JJ, van Kooyk Y, Tannous BA, Wesseling P, Koppers-Lalic D, Vandertop WP, Noske DP, van Beusechem VW, van Rheenen J, Pegtel DM, van Tellingen O, Wurdinger T. Glycosylated extracellular vesicles released by glioblastoma cells are decorated by CCL18 allowing for cellular uptake via chemokine receptor CCR8. J Extracell Vesicles 2018; 7:1446660. [PMID: 29696074 PMCID: PMC5912193 DOI: 10.1080/20013078.2018.1446660] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 02/23/2018] [Indexed: 02/07/2023] Open
Abstract
Cancer cells release extracellular vesicles (EVs) that contain functional biomolecules such as RNA and proteins. EVs are transferred to recipient cancer cells and can promote tumour progression and therapy resistance. Through RNAi screening, we identified a novel EV uptake mechanism involving a triple interaction between the chemokine receptor CCR8 on the cells, glycans exposed on EVs and the soluble ligand CCL18. This ligand acts as bridging molecule, connecting EVs to cancer cells. We show that glioblastoma EVs promote cell proliferation and resistance to the alkylating agent temozolomide (TMZ). Using in vitro and in vivo stem-like glioblastoma models, we demonstrate that EV-induced phenotypes are neutralised by a small molecule CCR8 inhibitor, R243. Interference with chemokine receptors may offer therapeutic opportunities against EV-mediated cross-talk in glioblastoma.
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Affiliation(s)
- Jordi Berenguer
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Tonny Lagerweij
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Xi Wen Zhao
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Sophie Dusoswa
- Department of Molecular Cell Biology and Immunology, VU University Medical Center, Amsterdam, The Netherlands
| | - Petra van der Stoop
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Bart Westerman
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Mark C de Gooijer
- Department of Bio-Pharmacy/Mouse Cancer Clinic, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Marloes Zoetemelk
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Anoek Zomer
- Cancer Genomics Netherlands, Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, The Netherlands
| | - Matheus H W Crommentuijn
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands.,Department of Bio-Pharmacy/Mouse Cancer Clinic, The Netherlands Cancer Institute, Amsterdam, The Netherlands.,Department of Neurology, Massachusetts General Hospital, Boston, MA, USA.,Program in Neuroscience, Harvard Medical School, Boston, MA, USA
| | - Laurine E Wedekind
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Àlan López-López
- Department of Physiological Sciences I, University of Barcelona, Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas, Barcelona, Spain
| | - Alberta Giovanazzi
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Marina Bruch-Oms
- Department of Molecular Cell Biology and Immunology, VU University Medical Center, Amsterdam, The Netherlands
| | | | - Rogier M Reijmers
- Department of Molecular Cell Biology and Immunology, VU University Medical Center, Amsterdam, The Netherlands
| | - Toin H van Kuppevelt
- Department of Matrix Biochemistry, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Juan-Jesús García-Vallejo
- Department of Molecular Cell Biology and Immunology, VU University Medical Center, Amsterdam, The Netherlands
| | - Yvette van Kooyk
- Department of Molecular Cell Biology and Immunology, VU University Medical Center, Amsterdam, The Netherlands
| | - Bakhos A Tannous
- Department of Neurology, Massachusetts General Hospital, Boston, MA, USA.,Program in Neuroscience, Harvard Medical School, Boston, MA, USA
| | - Pieter Wesseling
- Department of Pathology, VU University Medical Center, Amsterdam, The Netherlands.,Department of Pathology, Princess Máxima Center for Pediatric Oncology and University Medical Center Utrecht, Utrecht, The Netherlands
| | | | - W Peter Vandertop
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - David P Noske
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands
| | - Victor W van Beusechem
- Department of Medical Oncology, VU University Medical Center, Amsterdam, The Netherlands
| | - Jacco van Rheenen
- Cancer Genomics Netherlands, Hubrecht Institute-KNAW and University Medical Center Utrecht, Utrecht, The Netherlands
| | - D Michiel Pegtel
- Department of Matrix Biochemistry, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Olaf van Tellingen
- Department of Bio-Pharmacy/Mouse Cancer Clinic, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Thomas Wurdinger
- Department of Neurosurgery, VU University Medical Center, Amsterdam, The Netherlands.,Department of Neurology, Massachusetts General Hospital, Boston, MA, USA.,Program in Neuroscience, Harvard Medical School, Boston, MA, USA
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5
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Santos-Costa Q, Lopes MM, Calado M, Azevedo-Pereira JM. HIV-2 interaction with cell coreceptors: amino acids within the V1/V2 region of viral envelope are determinant for CCR8, CCR5 and CXCR4 usage. Retrovirology 2014; 11:99. [PMID: 25421818 PMCID: PMC4251929 DOI: 10.1186/s12977-014-0099-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2014] [Accepted: 10/24/2014] [Indexed: 01/26/2023] Open
Abstract
BACKGROUND Human immunodeficiency virus 1 and 2 (HIV-1 and HIV-2) use cellular receptors in distinct ways. Besides a more promiscuous usage of coreceptors by HIV-2 and a more frequent detection of CD4-independent HIV-2 isolates, we have previously identified two HIV-2 isolates (HIV-2MIC97 and HIV-2MJC97) that do not use the two major HIV coreceptors: CCR5 and CXCR4. All these features suggest that in HIV-2 the Env glycoprotein subunits may have a different structural organization enabling distinct - although probably less efficient - interactions with cellular receptors. RESULTS By infectivity assays using GHOST cell line expressing CD4 and CCR8 and blocking experiments using CCR8-specific ligand, I-309, we show that efficient replication of HIV-2MIC97 and HIV-2MJC97 requires the presence of CCR8 at plasma cell membrane. Additionally, we disclosed the determinants of chemokine receptor usage at the molecular level, and deciphered the amino acids involved in the usage of CCR8 (R8 phenotype) and in the switch from CCR8 to CCR5 or to CCR5/CXCR4 usage (R5 or R5X4 phenotype). The data obtained from site-directed mutagenesis clearly indicates that the main genetic determinants of coreceptor tropism are located within the V1/V2 region of Env surface glycoprotein of these two viruses. CONCLUSIONS We conclude that a viral population able to use CCR8 and unable to infect CCR5 or CXCR4-positive cells, may exist in some HIV-2 infected individuals during an undefined time period, in the course of the asymptomatic stage of infection. This suggests that in vivo alternate molecules might contribute to HIV infection of natural target cells, at least under certain circumstances. Furthermore we provide direct and unequivocal evidence that the usage of CCR8 and the switch from R8 to R5 or R5X4 phenotype is determined by amino acids located in the base and tip of V1 and V2 loops of HIV-2 Env surface glycoprotein.
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Affiliation(s)
- Quirina Santos-Costa
- Host-Pathogen Interaction Unit, Research Institute for Medicines and Pharmaceutical Sciences (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal. .,Instituto de Medicina Molecular (IMM), Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028, Lisboa, Portugal. .,Centro de Patogénese Molecular, Unidade dos Retrovírus e Infecções Associadas (CPM-URIA), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal.
| | - Maria Manuel Lopes
- Centro de Patogénese Molecular, Unidade dos Retrovírus e Infecções Associadas (CPM-URIA), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal.
| | - Marta Calado
- Host-Pathogen Interaction Unit, Research Institute for Medicines and Pharmaceutical Sciences (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal. .,Instituto de Medicina Molecular (IMM), Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028, Lisboa, Portugal. .,Centro de Patogénese Molecular, Unidade dos Retrovírus e Infecções Associadas (CPM-URIA), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal.
| | - José Miguel Azevedo-Pereira
- Host-Pathogen Interaction Unit, Research Institute for Medicines and Pharmaceutical Sciences (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal. .,Instituto de Medicina Molecular (IMM), Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028, Lisboa, Portugal. .,Centro de Patogénese Molecular, Unidade dos Retrovírus e Infecções Associadas (CPM-URIA), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisboa, Portugal.
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6
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An P, Li R, Wang JM, Yoshimura T, Takahashi M, Samudralal R, O'Brien SJ, Phair J, Goedert JJ, Kirk GD, Troyer JL, Sezgin E, Buchbinder SP, Donfield S, Nelson GW, Winkler CA. Role of exonic variation in chemokine receptor genes on AIDS: CCRL2 F167Y association with pneumocystis pneumonia. PLoS Genet 2011; 7:e1002328. [PMID: 22046140 PMCID: PMC3203199 DOI: 10.1371/journal.pgen.1002328] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2011] [Accepted: 08/03/2011] [Indexed: 02/04/2023] Open
Abstract
Chromosome 3p21-22 harbors two clusters of chemokine receptor genes, several of which serve as major or minor coreceptors of HIV-1. Although the genetic association of CCR5 and CCR2 variants with HIV-1 pathogenesis is well known, the role of variation in other nearby chemokine receptor genes remain unresolved. We genotyped exonic single nucleotide polymorphisms (SNPs) in chemokine receptor genes: CCR3, CCRL2, and CXCR6 (at 3p21) and CCR8 and CX3CR1 (at 3p22), the majority of which were non-synonymous. The individual SNPs were tested for their effects on disease progression and outcomes in five treatment-naïve HIV-1/AIDS natural history cohorts. In addition to the known CCR5 and CCR2 associations, significant associations were identified for CCR3, CCR8, and CCRL2 on progression to AIDS. A multivariate survival analysis pointed to a previously undetected association of a non-conservative amino acid change F167Y in CCRL2 with AIDS progression: 167F is associated with accelerated progression to AIDS (RH = 1.90, P = 0.002, corrected). Further analysis indicated that CCRL2-167F was specifically associated with more rapid development of pneumocystis pneumonia (PCP) (RH = 2.84, 95% CI 1.28-6.31) among four major AIDS-defining conditions. Considering the newly defined role of CCRL2 in lung dendritic cell trafficking, this atypical chemokine receptor may affect PCP through immune regulation and inducing inflammation.
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MESH Headings
- Acquired Immunodeficiency Syndrome/complications
- Chromosomes, Human, Pair 3/genetics
- Cohort Studies
- Disease Progression
- Exons
- Genetic Association Studies
- HEK293 Cells
- HIV-1
- Humans
- Linkage Disequilibrium
- Pneumonia, Pneumocystis/etiology
- Pneumonia, Pneumocystis/genetics
- Polymorphism, Single Nucleotide
- Receptors, CCR/chemistry
- Receptors, CCR/genetics
- Receptors, CCR3/genetics
- Receptors, CCR8/genetics
- Receptors, CXCR6
- Receptors, Chemokine/genetics
- Receptors, Virus/genetics
- Survival Analysis
- Treatment Outcome
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Affiliation(s)
- Ping An
- Basic Research Laboratory, SAIC–Frederick, National Cancer Institute–Frederick, Frederick, Maryland, United States of America
| | - Rongling Li
- Office of Population Genomics, National Human Genome Research Institute, Bethesda, Maryland, United States of America
| | - Ji Ming Wang
- Laboratory of Molecular Immunoregulation, National Cancer Institute–Frederick, Frederick, Maryland, United States of America
| | - Teizo Yoshimura
- Laboratory of Molecular Immunoregulation, National Cancer Institute–Frederick, Frederick, Maryland, United States of America
| | - Munehisa Takahashi
- Laboratory of Molecular Immunoregulation, National Cancer Institute–Frederick, Frederick, Maryland, United States of America
| | - Ram Samudralal
- Department of Microbiology, University of Washington School of Medicine, Seattle, Washington, United States of America
| | - Stephen J. O'Brien
- Laboratory of Genomic Diversity, National Cancer Institute–Frederick, Frederick, Maryland, United States of America
| | - John Phair
- Division of Infectious Diseases, Feinberg School of Medicine, Northwestern University Medical School, Chicago, Illinois, United States of America
| | - James J. Goedert
- Infections and Immunoepidemiology Branch, National Cancer Institute, Bethesda, Maryland, United States of America
| | - Gregory D. Kirk
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, United States of America
| | - Jennifer L. Troyer
- BSP/CCR Genetics Core, SAIC–Frederick, National Cancer Institute–Frederick, Frederick, Maryland, United States of America
| | - Efe Sezgin
- Laboratory of Genomic Diversity, National Cancer Institute–Frederick, Frederick, Maryland, United States of America
| | - Susan P. Buchbinder
- San Francisco Department of Public Health, San Francisco, California, United States of America
| | | | - George W. Nelson
- BSP/CCR Genetics Core, SAIC–Frederick, National Cancer Institute–Frederick, Frederick, Maryland, United States of America
| | - Cheryl A. Winkler
- Basic Research Laboratory, SAIC–Frederick, National Cancer Institute–Frederick, Frederick, Maryland, United States of America
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7
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Grivel JC, Shattock RJ, Margolis LB. Selective transmission of R5 HIV-1 variants: where is the gatekeeper? J Transl Med 2011; 9 Suppl 1:S6. [PMID: 21284905 PMCID: PMC3105506 DOI: 10.1186/1479-5876-9-s1-s6] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
To enter target cells HIV-1 uses CD4 and a coreceptor. In vivo the coreceptor function is provided either by CCR5 (for R5) or CXCR4 (for X4 HIV-1). Although both R5 and X4 HIV-1 variants are present in body fluids (semen, blood, cervicovaginal and rectal secretions), R5 HIV-1 appears to transmit infection and dominates early stages of HIV disease. Moreover, recent sequence analysis of virus in acute infection shows that, in the majority of cases of transmission, infection is initiated by a single virus. Therefore, the existence of a "gatekeeper" that selects R5 over X4 HIV-1 and that operates among R5 HIV-1 variants has been suggested. In the present review we consider various routes of HIV-transmission and discuss potential gatekeeping mechanisms associated with each of these routes. Although many mechanisms have been identified none of them explains the almost perfect selection of R5 over X4 in HIV-1 transmission. We suggest that instead of one strong gatekeeper there are multiple functional gatekeepers and that their superimposition is sufficient to protect against X4 HIV-1 infection and potentially select among R5 HIV-1 variants. In conclusion, we propose that the principle of multiple barriers is more general and not restricted to protection against X4 HIV-1 but rather can be applied to other phenomena when one factor has a selective advantage over the other(s). In the case of gatekeepers for HIV-1 transmission, the task is to identify them and to decipher their molecular mechanisms. Knowledge of the gatekeepers' localization and function may enable us to enhance existing barriers against R5 transmission and to erect the new ones against all HIV-1 variants.
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Affiliation(s)
- Jean-Charles Grivel
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, USA
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8
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Bunting MD, Comerford I, McColl SR. Finding their niche: chemokines directing cell migration in the thymus. Immunol Cell Biol 2010; 89:185-96. [PMID: 21135866 DOI: 10.1038/icb.2010.142] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
T lymphocytes are generated throughout life, arising from bone marrow-derived progenitors that complete an essential developmental process in the thymus. Thymic T cell education leads to the generation of a self-restricted and largely self-tolerant peripheral T-cell pool and is facilitated by interactions with thymic stromal cells residing in distinct supportive niches. The signals governing thymocyte precursor migration into the thymus, directing thymocyte navigation through thymic microenvironments and mature T-cell egress into circulation were, until recently, largely unknown, but presumed to be mediated to a large extent by chemokine signalling. Recent studies have now uncovered various specific functions for members of the chemokine superfamily in the thymus. These studies have not only revealed distinct but also in some cases overlapping roles for several chemokine family members in various thymocyte migration events and have also shown that homing and positioning of other cells in the thymus, such as dendritic cells and natural killer T cells is also chemokine-dependent. Here, we discuss current understanding of the role of chemokines in the thymus and highlight key future avenues for investigation in this field.
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Affiliation(s)
- Mark D Bunting
- Chemokine Biology Laboratory, Discipline of Microbiology and Immunology, The School of Molecular and Biomedical Science, The University of Adelaide, South Australia, Australia
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9
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Coreceptor usage by HIV-1 and HIV-2 primary isolates: The relevance of CCR8 chemokine receptor as an alternative coreceptor. Virology 2010; 408:174-82. [DOI: 10.1016/j.virol.2010.09.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Revised: 07/20/2010] [Accepted: 09/20/2010] [Indexed: 11/17/2022]
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10
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Could differential virological characteristics account for ongoing viral replication and insidious damage of the brain during HIV 1 infection of the central nervous system? J Clin Virol 2010; 49:231-8. [PMID: 20833583 DOI: 10.1016/j.jcv.2010.08.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 07/28/2010] [Accepted: 08/06/2010] [Indexed: 11/22/2022]
Abstract
Neurocognitive disorders due to human immunodeficiency virus type 1 (HIV-1) infection have been reported in 25-60% of cases,(1-3) despite a sustained viral response in peripheral blood while on highly active anti-retroviral therapy (HAART). A possible reason may be that the central nervous system (CNS) is less accessible for anti-retroviral agents, therefore this sanctuary site can provide a reservoir for ongoing HIV-1 replication. Mutations conferring resistance to anti-retroviral drugs may predominate in compartments where drug levels are suboptimal. This review provides an overview on the literature regarding the development of resistance mutations and the sensitivity for co-receptors in CNS. Mutations caused by the anti-retroviral drugs with the lowest intracerebral penetration would be expected to be found in higher percentages in the CNS than in the periphery of the human body. However, few studies have been performed that can confirm or reject this claim. Zidovudine, the anti-retroviral drug with the best intracerebral penetration, has been studied to some extent. This drug indeed induces resistance mutations in blood as well as the CNS. HAART induces a switch from HIV that uses co-receptor CRR5 to HIV that uses co-receptor CXCR4. This switch may appear later in the CNS compartment compared to the periphery. However, current literature shows conflicting evidence. In conclusion, the current understanding of HIV-strain evolution under drug pressure in sanctuary sites like CNS is incomplete. Therefore, more research is needed in order to establish the role of these sites in the development of drug resistant mutants under adequate HAART.
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11
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Heterosexual transmission of human immunodeficiency virus type 1 subtype C: Macrophage tropism, alternative coreceptor use, and the molecular anatomy of CCR5 utilization. J Virol 2009; 83:8208-20. [PMID: 19515785 DOI: 10.1128/jvi.00296-09] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Human immunodeficiency virus type 1 transmission selects for virus variants with genetic characteristics distinct from those of donor quasispecies, but the biological factors favoring their transmission or establishment in new hosts are poorly understood. We compared primary target cell tropisms and entry coreceptor utilizations of donor and recipient subtype C Envs obtained near the time of acute infection from Zambian heterosexual transmission pairs. Both donor and recipient Envs demonstrated only modest macrophage tropism, and there was no overall difference between groups in macrophage or CD4 T-cell infection efficiency. Several individual pairs showed donor/recipient differences in primary cell infection, but these were not consistent between pairs. Envs had surprisingly broad uses of GPR15, CXCR6, and APJ, but little or no use of CCR2b, CCR3, CCR8, GPR1, and CXCR4. Donors overall used GPR15 better than did recipients. However, while several individual pairs showed donor/recipient differences for GPR15 and/or other coreceptors, the direction of the differences was inconsistent, and several pairs had unique alternative coreceptor patterns that were conserved across the transmission barrier. CCR5/CCR2b chimeras revealed that recipients as a group were more sensitive than were donors to replacement of the CCR5 extracellular loops with corresponding regions of CCR2b, but significant differences in this direction were not consistent within pairs. These data show that sexual transmission does not select for enhanced macrophage tropism, nor for preferential use of any alternative coreceptor. Recipient Envs are somewhat more constrained than are donors in flexibility of CCR5 use, but this pattern is not universal for all pairs, indicating that it is not an absolute requirement.
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Shi YL, Luo XZ, Zhu XY, Li DJ. Combination of 17β-estradiol with the environmental pollutant TCDD is involved in pathogenesis of endometriosis via up-regulating the chemokine I-309–CCR8. Fertil Steril 2007; 88:317-25. [PMID: 17693327 DOI: 10.1016/j.fertnstert.2006.11.129] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2006] [Revised: 11/21/2006] [Accepted: 11/21/2006] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To explore the effects of the combined E(2) with the environmental pollutant 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) on CCR8-I-309 expression by the endometriotic lesion-associated cells in the pathogenesis of endometriosis. DESIGN Prospective laboratory study. SETTING University hospital. PATIENT(S) Chinese women with endometriosis. INTERVENTION(S) The endometriotic tissue and matched eutopic endometrium were collected. Endometrial stromal cells (ESCs), HPMC, and U937 cells were treated with 17beta-E(2) or TCDD. The ESCs were stimulated with I-309. MAIN OUTCOME MEASURE(S) The expression of CCR8 in tissues was analyzed by reverse transcription-polymerase chain reaction and immunohistochemistry. The effect of I-309 on integrin beta1 and alphavbeta3 expression intensity was analyzed by flow cytometry, and the chemotactic activity of I-309 on the ESC was explored by chemotactic assay. Concentration of I-309 in the culture supernatant was quantified by enzyme-linked immunosorbent assay. RESULT(S) CCR8 was overexpressed in the endometriotic tissue. I-309 promoted the expression of integrin beta1. Estradiol and TCDD up-regulated CCR8 expression by ESCs. Estradiol magnified the stimulatory effect of TCDD on I-309 secretion by U937. The interaction of HPMC and U937 cells promoted I-309 secretion. CONCLUSION(S) These findings imply that the combination of 17beta-E(2) with the environmental pollutant TCDD is involved in the pathogenesis of endometriosis via up-regulating the chemokine CCR8-I-309.
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Affiliation(s)
- Ying-Li Shi
- Laboratory for Reproductive Immunology, Hospital and Institute of Obstetrics and Gynecology, Fudan University Shanghai Medical College, Shanghai, China
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13
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Cilliers T, Willey S, Sullivan WM, Patience T, Pugach P, Coetzer M, Papathanasopoulos M, Moore JP, Trkola A, Clapham P, Morris L. Use of alternate coreceptors on primary cells by two HIV-1 isolates. Virology 2005; 339:136-44. [PMID: 15992849 DOI: 10.1016/j.virol.2005.05.027] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2005] [Revised: 03/30/2005] [Accepted: 05/25/2005] [Indexed: 10/25/2022]
Abstract
Two HIV-1 isolates (CM4 and CM9) able to use alternate HIV-1 coreceptors on transfected cell lines were tested for their sensitivity to inhibitors of HIV-1 entry on primary cells. CM4 was able to use CCR5 and Bob/GPR15 efficiently in transfected cells. The R5 isolate grew in Delta32/Delta32 CCR5 PBMC in the absence or presence of AMD3100, a CXCR4-specific inhibitor, indicating that it uses a receptor other than CCR5 or CXCR4 on primary cells. It was insensitive to the CCR5 entry inhibitors RANTES and PRO140, but was partially inhibited by vMIP-1, a chemokine that binds CCR3, CCR8, GPR15 and CXCR6. The coreceptor used by this isolate on primary cells is currently unknown. CM9 used CCR5, CXCR4, Bob/GPR15, CXCR6, CCR3, and CCR8 on transfected cells and was able to replicate in the absence or presence of AMD3100 in Delta32/Delta32 CCR5 PBMC. It was insensitive to eotaxin, vMIP-1 and I309 when tested individually, but was inhibited completely when vMIP-1 or I309 was combined with AMD3100. Both I309 and vMIP-1 bind CCR8, strongly suggesting that this isolate can use CCR8 on primary cells. Collectively, these data suggest that some HIV-1 isolates can use alternate coreceptors on primary cells, which may have implications for strategies that aim to block viral entry.
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Affiliation(s)
- Tonie Cilliers
- AIDS Virus Research Unit, National Institute for Communicable Diseases, Private Bag X4, Sandringham 2131, Johannesburg, South Africa
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Jeeninga RE, Jan B, van der Linden B, van den Berg H, Berkhout B. Construction of a minimal HIV-1 variant that selectively replicates in leukemic derived T-cell lines: towards a new virotherapy approach. Cancer Res 2005; 65:3347-55. [PMID: 15833868 DOI: 10.1158/0008-5472.can-04-4280] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
T-cell acute lymphoblastic leukemia is a high-risk type of blood-cell cancer. We analyzed the possibility of developing virotherapy for T-cell acute lymphoblastic leukemia. Virotherapy is based on the exclusive replication of a virus in leukemic cells, leading to the selective removal of these malignant cells. We constructed a minimized derivative of HIV-1, a complex lentivirus encoding multiple accessory functions that are essential for virus replication in untransformed cells, but dispensable in leukemic T cells. This mini-HIV virus has five deletions (vif, vpR, vpU, nef, and U3) and replicated in the SupT1 cell line, but did not replicate in normal peripheral blood mononuclear cells. The stripped down mini-HIV variant was also able to efficiently remove leukemic cells from a mixed culture with untransformed control cells. In contrast to wild-type HIV-1, we did not observe bystander killing in mixed culture experiments with the mini-HIV variant. Furthermore, viral escape was not detected in long-term cultures. The mini-HIV variant that uses CD4 and CXCR4 for cell entry could potentially be used against CXCR4-expressing malignancies such as T-lymphoblastic leukemia/lymphoma, natural killer leukemia, and some myeloid leukemias.
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Affiliation(s)
- Rienk E Jeeninga
- Department of Human Retrovirology, Emma Children Hospital, Academic Medical Center, University of Amsterdam, Meibergdreef 15, 1105 AZ Amsterdam, the Netherlands
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15
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Zhao XY, Lee SS, Wong KH, Chan KCW, Ng F, Chan CCS, Han D, Yam WC, Yuen KY, Ng MH, Zheng BJ. Functional analysis of naturally occurring mutations in the open reading frame of CCR5 in HIV-infected Chinese patients and healthy controls. J Acquir Immune Defic Syndr 2005; 38:509-17. [PMID: 15793360 DOI: 10.1097/01.qai.0000151004.19128.4a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We studied polymorphism of the HIV coreceptor CC chemokine receptor (CCR) 5 in 1099 Chinese adults residing in Hong Kong, including 785 HIV-negative healthy donors and 314 HIV-positive patients. Ten mutants in the CCR5 open reading frame were identified, 7 of which were nonsynonymous. The frequencies of these alleles did not show a significant difference between HIV patients and healthy controls. G106R, Delta32, R223Q, 299(FS), and S336I were cloned from prevalent mutant genes, and their effects on HIV infection were analyzed by a series of in vitro experiments to determine their transcription levels, expression levels, conformational changes, and HIV coreceptor function. R223Q is the most prevalent CCR5 mutant in ethnic Chinese, with a frequency of 0.046, which does not affect HIV infection in vitro, however. The S336I mutant also does not affect its transcription, expression, or HIV coreceptor function. Similar to 299(FS), the mutant G106R located in the third transmembrane domain results in diminished HIV coreceptor function in vitro through conformation changes in ECL2.
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Affiliation(s)
- Xiu-Ying Zhao
- HIV Research Laboratories, Department of Microbiology, University of Hong Kong, Hong Kong, China
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16
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Li QZ, Li P, Garcia GE, Johnson RJ, Feng L. Genomic profiling of neutrophil transcripts in Asian Qigong practitioners: a pilot study in gene regulation by mind-body interaction. J Altern Complement Med 2005; 11:29-39. [PMID: 15750361 DOI: 10.1089/acm.2005.11.29] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND AND OBJECTIVES The great similarity of the genomes of humans and other species stimulated us to search for genes regulated by elements associated with human uniqueness, such as the mind-body interaction. DNA microarray technology offers the advantage of analyzing thousands of genes simultaneously, with the potential to determine healthy phenotypic changes in gene expression. The aim of this study was to determine the genomic profile and function of neutrophils in Falun Gong (FLG, an ancient Chinese Qigong) practitioners, with healthy subjects as controls. SUBJECTS AND DESIGN Six (6) Asian FLG practitioners and 6 Asian normal healthy controls were recruited for our study. The practitioners have practiced FLG for at least 1 year (range, 1-5 years). The practice includes daily reading of FLG books and daily practice of exercises lasting 1-2 hours. Selected normal healthy controls did not perform Qigong, yoga, t'ai chi, or any other type of mind-body practice, and had not followed any conventional physical exercise program for at least 1 year. Neutrophils were isolated from fresh blood and assayed for gene expression, using microarrays and RNase protection assay (RPA), as well as for function (phagocytosis) and survival (apoptosis). RESULTS The changes in gene expression of FLG practitioners in contrast to normal healthy controls were characterized by enhanced immunity, downregulation of cellular metabolism, and alteration of apoptotic genes in favor of a rapid resolution of inflammation. The lifespan of normal neutrophils was prolonged, while the inflammatory neutrophils displayed accelerated cell death in FLG practitioners as determined by enzyme-linked immunosorbent assay. Correlating with enhanced immunity reflected by microarray data, neutrophil phagocytosis was significantly increased in Qigong practitioners. Some of the altered genes observed by microarray were confirmed by RPA. CONCLUSION Qigong practice may regulate immunity, metabolic rate, and cell death, possibly at the transcriptional level. Our pilot study provides the first evidence that Qigong practice may exert transcriptional regulation at a genomic level. New approaches are needed to study how genes are regulated by elements associated with human uniqueness, such as consciousness, cognition, and spirituality.
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Affiliation(s)
- Quan-Zhen Li
- Microarray Core, Center for Immunology, University of Texas Southwestern Medical Center, Dallas, TX, USA
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17
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Mukhtar M, Acheampong E, Khan MA, Bouhamdan M, Pomerantz RJ. Down-modulation of the CXCR4 co-receptor by intracellular expression of a single chain variable fragment (SFv) inhibits HIV-1 entry into primary human brain microvascular endothelial cells and post-mitotic neurons. ACTA ACUST UNITED AC 2005; 135:48-57. [PMID: 15857668 DOI: 10.1016/j.molbrainres.2004.11.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2004] [Accepted: 11/22/2004] [Indexed: 12/15/2022]
Abstract
Our laboratories previously demonstrated that expression of a single chain variable antibody fragment (SFv), anti-CXCR4 SFv, in human lymphoid cells suppresses surface display of the chemokine co-receptor CXCR4 and inhibits infectious entry of human immunodeficiency virus type I (HIV-1). We now sought to extend these results to two types of central nervous system (CNS) cells, primary isolated human brain microvascular endothelial cells (MVECs), and post-mitotic differentiated human neurons, both of which normally express significant levels of CXCR4. The anti-CXCR4 SFv expression construct was delivered using an HIV-1-based vector, and control cells received LacZ-expressing viral particles. Upon intracellular expression of the anti-CXCR4 SFv, immunostaining revealed a marked reduction in surface display of CXCR4 on both cell types. Consequently, post-mitotic neurons expressing the anti-CXCR4 SFv were significantly protected from HIV-1 infection, as measured by HIV-1 p24 antigen production, and partial protection was observed in human brain MVECs. The ability to selectively down-modulate the surface expression of CXCR4 in CNS cells may allow for the development of clinical molecular therapy strategies against HIV-1-related neurodegenerative disorders and neuroinvasion.
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Affiliation(s)
- Muhammad Mukhtar
- The Dorrance H. Hamilton Laboratories, Center for Human Virology and Biodefense, Division of Infectious Diseases and Environmental Medicine, Department of Medicine, Jefferson Medical College, Thomas Jefferson University, Philadelphia, PA 19107, USA
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18
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Abstract
Highly active antiretroviral therapy (HAART) has led to major declines in morbidity and mortality of HIV-1-infected individuals, but the increasing prevalence of drug-resistant viral isolates, combined with the toxicity and other limitations of current treatments, make the development of new therapies a high priority. As knowledge of viral entry has expanded, this step of the viral life cycle has become a target for novel therapeutic strategies. An emerging group of antiretrovirals, known collectively as entry inhibitors, targets several distinct steps in viral entry including CD4 binding, chemokine receptor engagement and the structural changes in the viral envelope required for fusion between viral and cellular membranes. Many entry inhibitors are in various stages of clinical development, with one already licensed for use. This review will provide an overview of the mechanisms involved in the entry process, highlight promising entry blockers under development and discuss several considerations related to treatment that are unique to this class of antiretroviral drugs.
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Affiliation(s)
- Brian Tomkowicz
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104, USA
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19
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Schaerli P, Ebert L, Willimann K, Blaser A, Roos RS, Loetscher P, Moser B. A skin-selective homing mechanism for human immune surveillance T cells. ACTA ACUST UNITED AC 2004; 199:1265-75. [PMID: 15123746 PMCID: PMC2211907 DOI: 10.1084/jem.20032177] [Citation(s) in RCA: 169] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Effective immune surveillance is essential for maintaining protection and homeostasis of peripheral tissues. However, mechanisms controlling memory T cell migration to peripheral tissues such as the skin are poorly understood. Here, we show that the majority of human T cells in healthy skin express the chemokine receptor CCR8 and respond to its selective ligand I-309/CCL1. These CCR8+ T cells are absent in small intestine and colon tissue, and are extremely rare in peripheral blood, suggesting healthy skin as their physiological target site. Cutaneous CCR8+ T cells are preactivated and secrete proinflammatory cytokines such as tumor necrosis factor–α and interferon-γ, but lack markers of cytolytic T cells. Secretion of interleukin (IL)-4, IL-10, and transforming growth factor–β was low to undetectable, arguing against a strict association of CCR8 expression with either T helper cell 2 or regulatory T cell subsets. Potential precursors of skin surveillance T cells in peripheral blood may correspond to the minor subset of CCR8+CD25− T cells. Importantly, CCL1 is constitutively expressed at strategic cutaneous locations, including dermal microvessels and epidermal antigen-presenting cells. For the first time, these findings define a chemokine system for homeostatic T cell traffic in normal human skin.
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Affiliation(s)
- Patrick Schaerli
- Theodor-Kocher Institute, University of Bern, P.O. Box 99, CH-3000 Bern 9, Switzerland
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20
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Moore JP, Kitchen SG, Pugach P, Zack JA. The CCR5 and CXCR4 coreceptors--central to understanding the transmission and pathogenesis of human immunodeficiency virus type 1 infection. AIDS Res Hum Retroviruses 2004; 20:111-26. [PMID: 15000703 DOI: 10.1089/088922204322749567] [Citation(s) in RCA: 327] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
In this review, we will discuss what is known, what is suspected, and what still remains obscure about the central role played by coreceptor expression and usage in the transmission and pathogenic consequences of human immunodeficiency virus type 1 (HIV-1) infection. An emphasis will be on the HIV-1 phenotypic variants that are defined by their usage of the CCR5 or CXCR4 coreceptors, and how the different cellular tropism of these variants influences how and where HIV-1 replicates in vivo. We will also review what might happen when coreceptor antagonists are used clinically to treat HIV-1 infection.
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Affiliation(s)
- John P Moore
- Department of Microbiology and Immunology, Weill Medical College of Cornell University, New York, New York 10021, USA.
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21
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Abdelwahab SF, Cocchi F, Bagley KC, Kamin-Lewis R, Gallo RC, DeVico A, Lewis GK. HIV-1-suppressive factors are secreted by CD4+ T cells during primary immune responses. Proc Natl Acad Sci U S A 2003; 100:15006-10. [PMID: 14657379 PMCID: PMC299882 DOI: 10.1073/pnas.2035075100] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
CD4+ T cells are required for immunity against many viral infections, including HIV-1 where a positive correlation has been observed between strong recall responses and low HIV-1 viral loads. Some HIV-1-specific CD4+ T cells are preferentially infected with HIV-1, whereas others escape infection by unknown mechanisms. One possibility is that some CD4+ T cells are protected from infection by the secretion of soluble HIV-suppressive factors, although it is not known whether these factors are produced during primary antigen-specific responses. Here, we show that soluble suppressive factors are produced against CXCR4 and CCR5 isolates of HIV-1 during the primary immune response of human CD4+ T cells. This activity requires antigenic stimulation of naïve CD4+ T cells. One anti-CXCR4 factor is macrophage-derived chemokine (chemokine ligand 22, CCL22), and anti-CCR5 factors include macrophage inflammatory protein-1 alpha (CCL3), macrophage inflammatory protein-1 beta (CCL4), and RANTES (regulated upon activation of normal T cells expressed and secreted) (CCL5). Intracellular staining confirms that CD3+CD4+ T cells are the source of the prototype HIV-1-inhibiting chemokines CCL22 and CCL4. These results show that CD4+ T cells secrete an evolving HIV-1-suppressive activity during the primary immune response and that this activity is comprised primarily of CC chemokines. The data also suggest that production of such factors should be considered in the design of vaccines against HIV-1 and as a mechanism whereby the host can control infections with this virus.
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Affiliation(s)
- Sayed F Abdelwahab
- Institute of Human Virology, Biotechnology Institute, and Department of Microbiology and Immunology, School of Medicine, University of Maryland, Baltimore, MD 21201, USA
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22
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Ohagen A, Devitt A, Kunstman KJ, Gorry PR, Rose PP, Korber B, Taylor J, Levy R, Murphy RL, Wolinsky SM, Gabuzda D. Genetic and functional analysis of full-length human immunodeficiency virus type 1 env genes derived from brain and blood of patients with AIDS. J Virol 2003; 77:12336-45. [PMID: 14581570 PMCID: PMC254258 DOI: 10.1128/jvi.77.22.12336-12345.2003] [Citation(s) in RCA: 133] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The genetic evolution of human immunodeficiency virus type 1 (HIV-1) in the brain is distinct from that in lymphoid tissues, indicating tissue-specific compartmentalization of the virus. Few primary HIV-1 envelope glycoproteins (Envs) from uncultured brain tissues have been biologically well characterized. In this study, we analyzed 37 full-length env genes from uncultured brain biopsy and blood samples from four patients with AIDS. Phylogenetic analysis of intrapatient sequence sets showed distinct clustering of brain relative to blood env sequences. However, no brain-specific signature sequence was identified. Furthermore, there was no significant difference in the number or positions of N-linked glycosylation sites between brain and blood env sequences. The patterns of coreceptor usage were heterogeneous, with no clear distinction between brain and blood env clones. Nine Envs used CCR5 as a coreceptor, one used CXCR4, and two used both CCR5 and CXCR4 in cell-to-cell fusion assays. Eight Envs could also use CCR3, CCR8, GPR15, STRL33, Apj, and/or GPR1, but these coreceptors did not play a major role in virus entry into microglia. Recognition of epitopes by the 2F5, T30, AG10H9, F105, 17b, and C11 monoclonal antibodies varied among env clones, reflecting genetic and conformational heterogeneity. Envs from two patients contained 28 to 32 N-glycosylation sites in gp120, compared to around 25 in lab strains and well-characterized primary isolates. These results suggest that HIV-1 Envs in brain cannot be distinguished from those in blood on the basis of coreceptor usage or the number or positions of N-glycosylation sites, indicating that other properties underlie neurotropism. The study also demonstrates characteristics of primary HIV-1 Envs from uncultured tissues and implies that Env variants that are glycosylated more extensively than lab strains and well-characterized primary isolates should be considered during development of vaccines and neutralizing antibodies.
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Affiliation(s)
- Asa Ohagen
- Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Boston, Massachusetts, USA
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Abstract
How HIV replicates and causes destruction of the thymus, and how to restore thymic function, are among the most important questions of HIV-1 pathogenesis and therapy in adult as well as pediatric patients. The thymus appears to function, albeit at reduced levels, throughout the life of adults, to respond to T cell depletion induced by HIV and to be suppressed by HIV. In this review, we summarize recent findings concerning HIV replication and pathogenesis in the human thymus, focusing on mechanistic insights gleaned from studies in the SCID-hu Thy/Liv mouse and human fetal-thymus organ culture (HF-TOC) models. First, we discuss HIV viral determinants and host factors involved in the replication of HIV in the thymus. Second, we consider evidence that both viral factors and host factors contribute to HIV-induced thymocyte depletion. We thus propose that multiple mechanisms, including depletion and suppression of progenitor cells, paracrine and direct lytic depletion of thymocytes, and altered thymocyte selection are involved in HIV-induced pathology in the thymus. With the SCID-hu Thy/Liv mouse and HF-TOC models, it will be important in the coming years to further clarify the virological, cell biological, and immunological mechanisms of HIV replication and pathogenesis in human thymus, and to correlate their significance in HIV disease progression.
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Affiliation(s)
- Eric G Meissner
- Department of Microbiology and Immunology, The Lineberger Comprehensive Cancer Center, School of Medicine, The University of North Carolina, Chapel Hill, NC 27599-7295, USA
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24
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Willey SJ, Reeves JD, Hudson R, Miyake K, Dejucq N, Schols D, De Clercq E, Bell J, McKnight A, Clapham PR. Identification of a subset of human immunodeficiency virus type 1 (HIV-1), HIV-2, and simian immunodeficiency virus strains able to exploit an alternative coreceptor on untransformed human brain and lymphoid cells. J Virol 2003; 77:6138-52. [PMID: 12743271 PMCID: PMC155019 DOI: 10.1128/jvi.77.11.6138-6152.2003] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The chemokine receptors CCR5 and CXCR4 are the major coreceptors for human immunodeficiency virus (HIV) and simian immunodeficiency virus (SIV). At least 12 other chemokine receptors or close relatives support infection by particular HIV and SIV strains on CD4(+) transformed indicator cell lines in vitro. However, the role of these alternative coreceptors in vivo is presently thought to be insignificant. Infection of cell lines expressing high levels of recombinant CD4 and coreceptors thus does not provide a true indication of coreceptor use in vivo. We therefore tested primary untransformed cell cultures that lack CCR5 and CXCR4, including astrocytes and brain microvascular endothelial cells (BMVECs), for naturally expressed alternative coreceptors functional for HIV and SIV infection. An adenovirus vector (Ad-CD4) was used to express CD4 in CD4(-) astrocytes and thus confer efficient infection if a functional coreceptor is present. Using a large panel of viruses with well-defined coreceptor usage, we identified a subset of HIV and SIV strains able to infect two astrocyte cultures derived from adult brain tissue. Astrocyte infection was partially inhibited by several chemokines, indicating a role for the chemokine receptor family in the observed infection. BMVECs were weakly positive for CD4 but negative for CCR5 and CXCR4 and were susceptible to infection by the same subset of isolates that infected astrocytes. BMVEC infection was efficiently inhibited by the chemokine vMIP-I, implicating one of its receptors as an alternative coreceptor for HIV and SIV infection. Furthermore, we tested whether the HIV type 1 and type 2 strains identified were able to infect peripheral blood mononuclear cells (PBMCs) via an alternative coreceptor. Several strains replicated in Delta32/Delta32 CCR5 PBMCs with CXCR4 blocked by AMD3100. This AMD3100-resistant replication was also sensitive to vMIP-I inhibition. The nature and potential role of this alternative coreceptor(s) in HIV infection in vivo is discussed.
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Affiliation(s)
- Samantha J Willey
- Center for AIDS Research, Program in Molecular Medicine, Department of Molecular Genetics and Microbiology, University of Massachusetts Medical School, Worcester 01605, USA
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25
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Spinetti G, Bernardini G, Camarda G, Mangoni A, Santoni A, Capogrossi MC, Napolitano M. The chemokine receptor CCR8 mediates rescue from dexamethasone-induced apoptosis via an ERK-dependent pathway. J Leukoc Biol 2003; 73:201-7. [PMID: 12525579 DOI: 10.1189/jlb.0302105] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Several chemokines have been shown to regulate cellular apoptosis following discrete stimuli. It was previously demonstrated that the CC chemokine CCL1 (I-309) rescues thymic lymphoma cells from apoptosis by unknown mechanisms. The aim of our study was to characterize the role of the CC chemokine receptor 8 (CCR8), the only described receptor for CCL1, in the rescue of murine thymic lymphoma cells and murine thymocytes from dexamethasone (dex)-induced apoptosis. We show here that the CCR8-restricted agonist Kaposi sarcoma-associated herpesvirus-encoded chemokine viral macrophage-inflammatory protein-1 (vMIP-1) rescues thymic lymphoma cells from dex-induced apoptosis, similar to CCL1, and that such rescue is extracellular-regulated kinase-dependent. Although it has been hypothesized that the rescuing effect of CCL1 from apoptosis could be CCR8-mediated, here, we formally demonstrate the role of such receptor as its selective antagonist encoded by the MC148 gene of molluscum contagiosum virus MC148/vMCC-I inhibits v-MIP-1- and CCL1-induced rescue activity. In addition, CCR8 ligands inhibit dex-induced apoptosis of murine thymocytes with potential implications for thymic selection.
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Affiliation(s)
- Gaia Spinetti
- Laboratorio di Patologia Vascolare, Istituto Dermopatico dell'Immacolata-Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Via Monti di Creta 104, 00167 Rome, Italy
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26
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Clapham PR, McKnight Á. Cell surface receptors, virus entry and tropism of primate lentiviruses. J Gen Virol 2002; 83:1809-1829. [PMID: 12124446 DOI: 10.1099/0022-1317-83-8-1809] [Citation(s) in RCA: 169] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Human immunodeficiency virus (HIV) exploits cell surface receptors to attach to and gain entry into cells. The HIV envelope spike glycoprotein on the surface of virus particles binds both CD4 and a seven-transmembrane coreceptor. These interactions trigger conformational changes in the envelope spike that induce fusion of viral and cellular membranes and entry of the viral core into the cell cytoplasm. Other cell surface receptors also interact with gp120 and aid attachment of virus particles. This review describes these receptors, their roles in HIV entry and their influence on cell tropism.
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Affiliation(s)
- Paul R Clapham
- Center for AIDS Research, Program in Molecular Medicine, Department of Molecular Genetics and Microbiology, University of Massachusetts Medical School, Biotech II, 373, Plantation Street, Worcester. MA 01605, USA1
| | - Áine McKnight
- The Wohl Virion Center, Department of Immunology and Molecular Pathology, The Windeyer Institute for Medical Sciences, University College London, 46 Cleveland Street, London W1P 6DB, UK2
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Pedroza-Martins L, Boscardin WJ, Anisman-Posner DJ, Schols D, Bryson YJ, Uittenbogaart CH. Impact of cytokines on replication in the thymus of primary human immunodeficiency virus type 1 isolates from infants. J Virol 2002; 76:6929-43. [PMID: 12072494 PMCID: PMC136332 DOI: 10.1128/jvi.76.14.6929-6943.2002] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Early infection of the thymus with the human immunodeficiency virus (HIV) may explain the more rapid disease progression among children infected in utero than in children infected intrapartum. Therefore, we analyzed infection of thymocytes in vitro by HIV type 1 primary isolates, obtained at or near birth, from 10 children with different disease outcomes. HIV isolates able to replicate in the thymus and impact thymopoiesis were present in all infants, regardless of the timing of viral transmission and the rate of disease progression. Isolates from newborns utilized CCR5, CXCR4, or both chemokine receptors to enter thymocytes. Viral expression was observed in discrete thymocyte subsets postinfection with HIV isolates using CXCR4 (X4) and isolates using CCR5 (R5), despite the wider distribution of CXCR4 in the thymus. In contrast to previous findings, the X4 primary isolates were not more cytopathic for thymocytes than were the R5 isolates. The cytokines interleukin-2 (IL-2), IL-4, and IL-7 increased HIV replication in the thymus by inducing differentiation and expansion of mature CD27(+) thymocytes expressing CXCR4 or CCR5. IL-2 and IL-4 together increased expression of CXCR4 and CCR5 in this population, whereas IL-4 and IL-7 increased CXCR4 but not CCR5 expression. IL-2 plus IL-4 increased the viral production of all pediatric isolates, but IL-4 and IL-7 had a significantly higher impact on the replication of X4 isolates compared to R5 isolates. Our studies suggest that coreceptor use by HIV primary isolates is important but is not the sole determinant of HIV pathogenesis in the thymus.
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Affiliation(s)
- Livia Pedroza-Martins
- Department of Microbiology, Immunology, and Molecular Genetics, UCLA AIDS Institute, USA
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28
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Gorry PR, Taylor J, Holm GH, Mehle A, Morgan T, Cayabyab M, Farzan M, Wang H, Bell JE, Kunstman K, Moore JP, Wolinsky SM, Gabuzda D. Increased CCR5 affinity and reduced CCR5/CD4 dependence of a neurovirulent primary human immunodeficiency virus type 1 isolate. J Virol 2002; 76:6277-92. [PMID: 12021361 PMCID: PMC136234 DOI: 10.1128/jvi.76.12.6277-6292.2002] [Citation(s) in RCA: 180] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Most human immunodeficiency virus type 1 (HIV-1) viruses in the brain use CCR5 as the principal coreceptor for entry into a cell. However, additional phenotypic characteristics are necessary for HIV-1 neurotropism. Furthermore, neurotropic strains are not necessarily neurovirulent. To better understand the determinants of HIV-1 neurovirulence, we isolated viruses from brain tissue samples from three AIDS patients with dementia and HIV-1 encephalitis and analyzed their ability to induce syncytia in monocyte-derived macrophages (MDM) and neuronal apoptosis in primary brain cultures. Two R5X4 viruses (MACS1-br and MACS1-spln) were highly fusogenic in MDM and induced neuronal apoptosis. The R5 viruses UK1-br and MACS2-br are both neurotropic. However, only UK1-br induced high levels of fusion in MDM and neuronal apoptosis. Full-length Env clones from UK1-br required lower CCR5 and CD4 levels than Env clones from MACS2-br to function efficiently in cell-to-cell fusion and single-round infection assays. UK1-br Envs also had a greater affinity for CCR5 than MACS2-br Envs in binding assays. Relatively high levels of UK1-br and MACS2-br Envs bound to CCR5 in the absence of soluble CD4. However, these Envs could not mediate CD4-independent infection, and MACS2-br Envs were unable to mediate fusion or infection in cells expressing low levels of CD4. The UK1-br virus was more resistant than MACS2-br to inhibition by the CCR5-targeted inhibitors TAK-779 and Sch-C. UK1-br was more sensitive than MACS2-br to neutralization by monoclonal antibodies (2F5 and immunoglobulin G1b12 [IgG1b12]) and CD4-IgG2. These results predict the presence of HIV-1 variants with increased CCR5 affinity and reduced dependence on CCR5 and CD4 in the brains of some AIDS patients with central nervous system disease and suggest that R5 variants with increased CCR5 affinity may represent a pathogenic viral phenotype contributing to the neurodegenerative manifestations of AIDS.
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Affiliation(s)
- Paul R Gorry
- Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts 02115, USA
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29
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Zaitseva M, Kawamura T, Loomis R, Goldstein H, Blauvelt A, Golding H. Stromal-derived factor 1 expression in the human thymus. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2002; 168:2609-17. [PMID: 11884424 DOI: 10.4049/jimmunol.168.6.2609] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Stromal-derived factor-1 (SDF-1), the only known ligand for the chemokine receptor CXCR4, is broadly expressed in cells of both the immune and central nervous systems, and it can induce the migration of resting leukocytes and hemopoietic progenitors. SDF-1 mRNA was previously detected in human thymus-derived stromal cells, but its role in thymopoiesis was unknown. Here we show that SDF-1 is expressed in medullar epithelial cells forming Hassall's corpuscles (HC). In search of the cell type that may be attracted by SDF-1(+) cells in the medulla, we determined that dendritic cells (DC) could be found in situ in close proximity to SDF-1(+) epithelial cells in HC. In HIV-1-infected SCID-hu thymuses, DC contained apoptotic cells and were located within enlarged HC. It was further demonstrated that uptake of apoptotic thymocytes by immature DC induced an increase in CXCR4 expression and SDF-1-mediated chemotaxis. Our data suggest a role for SDF-1 in the elimination of apoptotic thymocytes.
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Affiliation(s)
- Marina Zaitseva
- Division of Viral Products, Center for Biologics Evaluation and Research, Food and Drug Administration, and Dermatology Branch, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
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30
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Taylor JR, Kimbrell KC, Scoggins R, Delaney M, Wu L, Camerini D. Expression and function of chemokine receptors on human thymocytes: implications for infection by human immunodeficiency virus type 1. J Virol 2001; 75:8752-60. [PMID: 11507220 PMCID: PMC115120 DOI: 10.1128/jvi.75.18.8752-8760.2001] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The presence or absence of the receptor CD4 and the coreceptors CCR5 and CXCR4 restrict the cell tropism of human immunodeficiency virus type 1 (HIV-1). Despite the importance of thymic infection by HIV-1, conflicting reports regarding the expression of HIV-1 coreceptors on human thymocytes have not been resolved. We assayed the expression and function of the major HIV-1 coreceptors, CCR5 and CXCR4, as well as CCR4 and CCR7 as controls, on human thymocytes. We detected CCR5 on 2.5% of thymocytes, CXCR4 on 53% of the cells, and CCR4 on 16% and CCR7 on 11% of human thymocytes. Moreover, infection by R5 HIV-1 did not significantly induce expression of CCR5. We found that two widely used anti-CCR5 monoclonal antibodies cross-reacted with CCR8, which may account for discrepancies among published reports of CCR5 expression on primary cells. This cross-reactivity could be eliminated by deletion of amino acids 2 through 4 of CCR8. Chemotaxis assays showed that SDF-1, which binds CXCR4; MDC, which binds CCR4; and ELC, which binds CCR7, mediated significant chemotaxis of thymocytes. In contrast, MIP-1beta, whose receptor is CCR5, did not induce significant chemotaxis. Our results indicate that CXCR4, CCR4, CCR7, and their chemokine ligands may be involved in thymocyte migration during development in the thymus. CCR5 and its ligands, however, are likely not involved in these processes. Furthermore, the pattern of CCR5 and CXCR4 expression that we found may explain the greater susceptibility of human thymocytes to infection by HIV-1 isolates capable of using CXCR4 in cell entry compared to those that use only CCR5.
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MESH Headings
- Amino Acid Sequence
- Animals
- Antibodies, Monoclonal/immunology
- Chemokine CCL19
- Chemokine CCL22
- Chemokine CCL4
- Chemokine CXCL12
- Chemokines, CC/metabolism
- Chemokines, CXC/metabolism
- Chemotaxis/physiology
- Cross Reactions
- Disease Models, Animal
- HIV Infections/metabolism
- HIV Infections/virology
- HIV-1/metabolism
- HIV-1/physiology
- Humans
- Macrophage Inflammatory Proteins/metabolism
- Macrophages/metabolism
- Mice
- Mice, SCID
- Molecular Sequence Data
- Receptors, CCR4
- Receptors, CCR5/biosynthesis
- Receptors, CCR5/immunology
- Receptors, CCR7
- Receptors, CCR8
- Receptors, CXCR4/biosynthesis
- Receptors, Chemokine/biosynthesis
- Receptors, Chemokine/immunology
- Receptors, Chemokine/metabolism
- Receptors, Chemokine/physiology
- Thymus Gland/cytology
- Thymus Gland/metabolism
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Affiliation(s)
- J R Taylor
- Department of Microbiology and Myles H. Thaler Center for AIDS and Human Retrovirus Research, University of Virginia, Charlottesville, Virginia 22908, USA
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31
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Simonart T, Debussher C, Liesnard C, Debaisieux L, Delforge ML, de Lavareille A, Hermans P, Van Vooren JP, Stordeur P. Cultured Kaposi's sarcoma tumor cells exhibit a chemokine receptor repertoire that does not allow infection by HIV-1. BMC DERMATOLOGY 2001; 1:2. [PMID: 11518547 PMCID: PMC37541 DOI: 10.1186/1471-5945-1-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2001] [Accepted: 07/24/2001] [Indexed: 01/24/2023]
Abstract
BACKGROUND HIV-1 is known to play a critical role in the pathogenesis of AIDS-associated Kaposi's sarcoma (KS). However, it remains controversial whether KS cells are target cells for HIV infection. The aim of this study was to investigate the expression of chemokine receptors in KS cell cultures and to determine whether these cells can be infected by HIV-1. MATERIAL AND METHODS KS-derived cells and KS-Y1 cells were investigated using RT-PCR for the expression of CD4, CCR3, CCR5, CCR8 and CXCR4 mRNA. HIV infectivity of these cells was determined by p24 antigen and HIV-1 RNA production, as well as by HIV-1 DNA integration. RESULTS AND DISCUSSION With the exception of CCR8 which is expressed by KS-derived spindle cell cultures but not by KS-Y1 cells, unstimulated KS cells express no significant levels of CD4, CCR3, CCR5 or CXCR4 mRNA. HIV infectivity assays showed that KS cells were unpermissive to HTLVIIIB and JRFL strains. Although the expression of CXCR4 mRNA could be upregulated by interleukin-1beta, stimulation of KS cells by this cytokine did not allow infection by HIV-1. CONCLUSIONS This shows that KS cells exhibit a chemokine receptor repertoire that does not allow infection by HIV-1. Other cell types making up KS lesions, such as inflammatory cells, are likely to represent the source of HIV-1 products cooperating to promote KS development and progression.
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MESH Headings
- Actins/metabolism
- CD4 Antigens/metabolism
- DNA, Viral/isolation & purification
- Disease Progression
- HIV-1/genetics
- HIV-1/isolation & purification
- HIV-1/pathogenicity
- Humans
- RNA, Messenger/analysis
- RNA, Viral/isolation & purification
- Receptors, CCR3
- Receptors, CCR5/metabolism
- Receptors, CCR8
- Receptors, CXCR4/genetics
- Receptors, CXCR4/metabolism
- Receptors, Chemokine/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Sarcoma, Kaposi/metabolism
- Sarcoma, Kaposi/virology
- Tumor Cells, Cultured/metabolism
- Tumor Cells, Cultured/virology
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Affiliation(s)
- Thierry Simonart
- Department of Dermatology, Erasme University Hospital, 808 Route de Lennick, Brussels, 1070, Belgium
| | - Claire Debussher
- Department of Dermatology, Erasme University Hospital, 808 Route de Lennick, Brussels, 1070, Belgium
| | - Corinne Liesnard
- Virology, Erasme University Hospital, 808 Route de Lennick, Brussels, 1070, Belgium
| | - Laurent Debaisieux
- Virology, Erasme University Hospital, 808 Route de Lennick, Brussels, 1070, Belgium
| | - Marie-Luce Delforge
- Virology, Erasme University Hospital, 808 Route de Lennick, Brussels, 1070, Belgium
| | - Aurore de Lavareille
- Immunology, Erasme University Hospital, 808 Route de Lennick, Brussels, 1070, Belgium
| | - Philippe Hermans
- Department of Infectious Diseases, Saint-Pierre University Hospital, Brussels, 1000, Belgium
| | - Jean-Paul Van Vooren
- Internal Medicine, Erasme University Hospital, 808 Route de Lennick, Brussels, 1070, Belgium
| | - Patrick Stordeur
- Immunology, Erasme University Hospital, 808 Route de Lennick, Brussels, 1070, Belgium
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32
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Yi Y, Singh A, Isaacs SN, Collman RG. A CCR5/CXCR4-independent coreceptor pathway on human macrophages supports efficient SIV env-mediated fusion but not infection: implications for alternative pathways of viral entry. Virology 2001; 284:142-51. [PMID: 11352675 DOI: 10.1006/viro.2001.0904] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Several coreceptors in addition to CCR5 and CXCR4 support immunodeficiency virus entry in transfected cells, but whether they could play a role in HIV-1 pathogenesis is uncertain. To probe whether human macrophages express potentially functional alternative entry pathways, we analyzed cell-cell fusion and infection of primary macrophage by several SIVmac Envs. All Envs fused with normal macrophages. One, SIVmac316, also fused efficiently with macrophages lacking CCR5. CCR5-independent fusion was not mediated by CXCR4 and was CD4 dependent, while CCR5-mediated fusion was partly independent of CD4. However, pseudotype virions carrying the SIVmac316 Env and HIV-1 core could not infect macrophages through the CCR5-independent pathway, although they did infect wild-type macrophages. Thus, human macrophages possess an alternative coreceptor pathway that mediates SIV Env fusion but does not support infection. Macrophage entry pathways other than CCR5 and CXCR4 may have limited potential in pathogenesis given their restricted capacity for infection despite efficient fusion.
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Affiliation(s)
- Y Yi
- Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA
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33
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Agrawal L, Alkhatib G, Agrawal L. Chemokine receptors: emerging opportunities for new anti-HIV therapies. Expert Opin Ther Targets 2001; 5:303-326. [PMID: 12540267 DOI: 10.1517/14728222.5.3.303] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The chemokine receptors CCR5 and CXCR4 are G-protein coupled receptors (GPCRs) of the immune system and the major co-receptors required for entry of HIV into CD4(+) target cells. CCR5 is critical for both human immunodeficiency virus (HIV) disease transmission and progression, whereas CXCR4 may be very important in late stages of disease. Additional co-receptors have been shown to function under certain conditions in vitro but evidence of supporting roles in HIV disease is currently lacking. The sheer number of co-receptors potentially used by HIV and the complexity of co-receptors usage are major challenges confronting usage of these molecules as drug development targets. Balanced against this, is a long history of success by the pharmaceutical industry in developing small molecule antagonists for many other classes of GPCRs. In this review, we discuss the current state of understanding of the co-receptor-based antiviral agents designed to block viral entry. The therapeutic potential of this field will be judged from future studies on the efficacy of these novel inhibitors in clinical trials. The data so far obtained from a number of studies point to the potential clinical use of this emerging class of therapeutic agents. Here we review current progress in co-receptor-based antiretroviral drug development and discuss the potential advantages and disadvantages of this approach.
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Affiliation(s)
- Lokesh Agrawal
- Department of Microbiology and Immunology, Walther Oncology Center, Indiana University School of Medicine, 1044 W Walnut Street, Room 302, Indianapolis, IN 46202, USA
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34
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Malkevitch N, McDermott DH, Yi Y, Grivel JC, Schols D, De Clercq E, Murphy PM, Glushakova S, Collman RG, Margolis L. Coreceptor choice and T cell depletion by R5, X4, and R5X4 HIV-1 variants in CCR5-deficient (CCR5delta32) and normal human lymphoid tissue. Virology 2001; 281:239-47. [PMID: 11277696 DOI: 10.1006/viro.2000.0807] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Coreceptor utilization by HIV-1 is an important determinant of pathogenesis. However, coreceptor selectivity is defined in vitro, while in vivo critical pathogenic events occur in lymphoid tissues. Using pharmacological inhibitors, we recently provided evidence that coreceptor selectivity by the R5X4 dual-tropic isolate 89.6 was more restricted in ex vivo infected lymphoid tissue than in vitro [S. Glushakova, Y. Yi, J. C. Grivel, A. Singh, D. Schols, E. De Clercq, R. G. Collman, and L. Margolis (1999). J. Clin. Invest. 104, R7-R11]. Here we extend those observations using CCR5-deficient (CCR5Delta32) lymphoid tissue as well as additional primary isolates. We definitively show that neither CCR5 nor secondary coreceptors used in vitro mediate 89.6 infection in lymphoid tissue. We also demonstrate that restricted coreceptor use in lymphoid tissue ex vivo compared with in vitro utilization occurs with other dual-tropic primary isolates and is not unique to 89.6. For all strains tested that are dual tropic in vitro, severe CD4 T cell depletion in lymphoid tissue correlated with preferential CXCR4 use in this ex vivo system.
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Affiliation(s)
- N Malkevitch
- Laboratory of Molecular and Cellular Biophysics, National Institutes of Health, Bethesda, Maryland 20892, USA
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35
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Murphy PM. Viral exploitation and subversion of the immune system through chemokine mimicry. Nat Immunol 2001; 2:116-22. [PMID: 11175803 DOI: 10.1038/84214] [Citation(s) in RCA: 241] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The chemokine superfamily of leukocyte chemoattractants coordinates development and deployment of the immune system by signaling through a family of G protein-coupled receptors. The importance of this system to antimicrobial host defense has been supported by the discovery of numerous herpesviruses and poxviruses that encode chemokine mimics able to block chemokine action. However, specific herpesviruses and lentiviruses can also exploit the immune system through chemokine mimicry, for example, to facilitate viral dissemination or, as in the case of HIV-1, to directly infect leukocyte target cells. The study of viral mimicry of chemokines and chemokine receptors is providing important new concepts in viral immunopathogenesis, new anti-inflammatory drug leads and new targets and concepts for antiviral drug and vaccine development.
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Affiliation(s)
- P M Murphy
- Molecular Signaling Section, Laboratory of Host Defenses, National Institute of Allergy and Infectious Diseases, Bldg. 10, Room 11N113, National Institutes of Health, Bethesda, MD 20892, USA.
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36
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Abstract
HIV virus particles interact with several receptors on cell surfaces. Two receptors, CD4 and a co-receptor act sequentially to trigger fusion of viral and cellular membranes and confer virus entry into cells. For HIV-1, the chemokine receptor CCR5 is the predominant co-receptor exploited for transmission and replication in vivo. Variants that switch to use CXCR4 and perhaps other co-receptors evolve in some infected individuals and have altered tropism and pathogenic properties. Other cell surface receptors including mannose binding protein on macrophages and DC-SIGN on dendritic cells also interact with gp120 on virus particles but do not actively promote fusion and virus entry. These receptors may tether virus particles to cells enabling interactions with suboptimal concentrations of CD4 and/or co-receptors. Alternatively such receptors may transport cell surface trapped virions into lymph nodes before transmitting them to susceptible cells. Therapeutic strategies that prevent HIV from interacting with receptors are currently being developed. This review describes how the interaction and use of different cellular receptors influences HIV tropism and pathogenesis in vivo.
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Affiliation(s)
- P R Clapham
- Center for AIDS Research, Program in Molecular Medicine, Department of Molecular Genetics and Microbiology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA
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37
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Doms RW. Beyond receptor expression: the influence of receptor conformation, density, and affinity in HIV-1 infection. Virology 2000; 276:229-37. [PMID: 11040114 DOI: 10.1006/viro.2000.0612] [Citation(s) in RCA: 154] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- R W Doms
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, USA.
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