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Waters S, Lee S, Ariyanto I, Leary S, Munyard K, Gaudieri S, Irish A, Allcock RJN, Price P. Variants of HCMV UL18 Sequenced Directly from Clinical Specimens Associate with Antibody and T-Cell Responses to HCMV. Int J Mol Sci 2022; 23:ijms232112911. [PMID: 36361707 PMCID: PMC9658343 DOI: 10.3390/ijms232112911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 10/13/2022] [Accepted: 10/21/2022] [Indexed: 11/28/2022] Open
Abstract
Around 80% of adults worldwide carry human cytomegaloviris (HCMV). The HCMV gene UL18 is a homolog of HLA class I genes and encodes a protein with high affinity for the NK and T-cell cytotoxicity inhibitor LIR-1. UL18 was deep sequenced from blood, saliva or urine from Indonesian people with HIV (PWH) (n = 28), Australian renal transplant recipients (RTR) (n = 21), healthy adults (n = 7) and neonates (n = 4). 95% of samples contained more than one variant of HCMV UL18, as defined by carriage of nonsynonymous variations. When aligned with immunological markers of the host’s burden of HCMV, the S318N variation associated with high levels of antibody reactive with HCMV lysate in PWH over 12 months on antiretroviral therapy. The A107T variation associated with HCMV antibody levels and inflammatory biomarkers in PWH at early timepoints. Variants D32G, D248N, V250A and E252D aligned with elevated HCMV antibody levels in RTR, while M191K, E196Q and F165L were associated with HCMV-reactive T-cells and proportions of Vδ2− γδ T-cells—populations linked with high burdens of HCMV. We conclude that UL18 is a highly variable gene, where variation may alter the persistent burden of HCMV and/or the host response to that burden.
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Affiliation(s)
- Shelley Waters
- Curtin Health Innovation Research Institute, Curtin Medical School, Curtin University, Bentley 6102, Australia
- Correspondence:
| | - Silvia Lee
- Curtin Health Innovation Research Institute, Curtin Medical School, Curtin University, Bentley 6102, Australia
- PathWest Laboratory Medicine WA, Department of Microbiology, Nedlands 6009, Australia
| | - Ibnu Ariyanto
- Virology and Cancer Pathobiology Research Center, Faculty of Medicine, Universitas Indonesia, Jakarta 10430, Indonesia
| | - Shay Leary
- Institute for Immunology and Infectious Diseases, Murdoch University, Murdoch 6150, Australia
| | - Kylie Munyard
- Curtin Health Innovation Research Institute, Curtin Medical School, Curtin University, Bentley 6102, Australia
| | - Silvana Gaudieri
- Institute for Immunology and Infectious Diseases, Murdoch University, Murdoch 6150, Australia
- School of Human Sciences, University of Western Australia, Nedlands 6009, Australia
- Department of Medicine, Division of Infectious Diseases, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Ashley Irish
- Department of Nephrology, Fiona Stanley Hospital, Murdoch 6150, Australia
| | - Richard J. N. Allcock
- School of Biomedical Sciences, University of Western Australia, Nedlands 6009, Australia
- PathWest Laboratory Medicine WA, Department of Diagnostic Genomics, Nedlands 6009, Australia
| | - Patricia Price
- Curtin Health Innovation Research Institute, Curtin Medical School, Curtin University, Bentley 6102, Australia
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Deng M, Chen H, Liu X, Huang R, He Y, Yoo B, Xie J, John S, Zhang N, An Z, Zhang CC. Leukocyte immunoglobulin-like receptor subfamily B: therapeutic targets in cancer. Antib Ther 2021; 4:16-33. [PMID: 33928233 PMCID: PMC7944505 DOI: 10.1093/abt/tbab002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 02/06/2023] Open
Abstract
Inhibitory leukocyte immunoglobulin-like receptors (LILRBs 1–5) transduce signals via intracellular immunoreceptor tyrosine-based inhibitory motifs that recruit phosphatases to negatively regulate immune activation. The activation of LILRB signaling in immune cells may contribute to immune evasion. In addition, the expression and signaling of LILRBs in cancer cells especially in certain hematologic malignant cells directly support cancer development. Certain LILRBs thus have dual roles in cancer biology—as immune checkpoint molecules and tumor-supporting factors. Here, we review the expression, ligands, signaling, and functions of LILRBs, as well as therapeutic development targeting them. LILRBs may represent attractive targets for cancer treatment, and antagonizing LILRB signaling may prove to be effective anti-cancer strategies.
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Affiliation(s)
- Mi Deng
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Heyu Chen
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Xiaoye Liu
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Ryan Huang
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Yubo He
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Byounggyu Yoo
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jingjing Xie
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Samuel John
- Department of Pediatrics, Pediatric Hematology-Oncology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Ningyan Zhang
- Texas Therapeutics Institute, Brown Foundation Institute of Molecular Medicine, University of Texas Houston Health Science Center, Houston, TX 77030, USA
| | - Zhiqiang An
- Texas Therapeutics Institute, Brown Foundation Institute of Molecular Medicine, University of Texas Houston Health Science Center, Houston, TX 77030, USA
| | - Cheng Cheng Zhang
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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Yu K, Davidson CE, Burshtyn DN. LILRB1 Intron 1 Has a Polymorphic Regulatory Region That Enhances Transcription in NK Cells and Recruits YY1. THE JOURNAL OF IMMUNOLOGY 2020; 204:3030-3041. [PMID: 32321755 DOI: 10.4049/jimmunol.2000164] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 03/31/2020] [Indexed: 12/11/2022]
Abstract
LILRB1 is a highly polymorphic receptor expressed by subsets of innate and adaptive immune cells associated with viral and autoimmune diseases and targeted by pathogens for immune evasion. LILRB1 expression on human NK cells is variegated, and the frequency of LILRB1+ cells differs among people. However, little is known about the processes and factors mediating LILRB1 transcription in NK cells. LILRB1 gene expression in lymphoid and myeloid cells arises from two distinct promoters that are separated by the first exon and intron. In this study, we identified a polymorphic 3-kb region within LILRB1 intron 1 that is epigenetically marked as an active enhancer in human lymphoid cells and not monocytes. This region possesses multiple YY1 sites, and complexes of the promoter/enhancer combination were isolated using anti-YY1 in chromatin immunoprecipitation-loop. CRISPR-mediated deletion of the 3-kb region lowers LILRB1 expression in human NKL cells. Together, these results indicate the enhancer in intron 1 binds YY1 and suggest YY1 provides a scaffold function enabling enhancer function in regulating LILRB1 gene transcription in human NK cells.
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Affiliation(s)
- Kang Yu
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta T6G 2S2, Canada
| | - Chelsea E Davidson
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta T6G 2S2, Canada
| | - Deborah N Burshtyn
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta T6G 2S2, Canada; .,Alberta Transplant Institute, University of Alberta, Edmonton, Alberta T6G 2H7, Canada; and.,Li Ka Shing Institute of Virology, University of Alberta, Edmonton, Alberta T6G 2H7, Canada
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4
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Yu K, Davidson CL, Wójtowicz A, Lisboa L, Wang T, Airo AM, Villard J, Buratto J, Sandalova T, Achour A, Humar A, Boggian K, Cusini A, van Delden C, Egli A, Manuel O, Mueller N, Bochud PY, Burshtyn DN. LILRB1 polymorphisms influence posttransplant HCMV susceptibility and ligand interactions. J Clin Invest 2018. [PMID: 29528338 DOI: 10.1172/jci96174] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
UL18 is a human CMV (HCMV) MHC class I (MHCI) homolog that efficiently inhibits leukocyte immunoglobulin-like receptor subfamily B member 1 (LILRB1)+ NK cells. We found an association of LILRB1 polymorphisms in the regulatory regions and ligand-binding domains with control of HCMV in transplant patients. Naturally occurring LILRB1 variants expressed in model NK cells showed functional differences with UL18 and classical MHCI, but not with HLA-G. The altered functional recognition was recapitulated in binding assays with the binding domains of LILRB1. Each of 4 nonsynonymous substitutions in the first 2 LILRB1 immunoglobulin domains contributed to binding with UL18, classical MHCI, and HLA-G. One of the polymorphisms controlled addition of an N-linked glycan, and that mutation of the glycosylation site altered binding to all ligands tested, including enhancing binding to UL18. Together, these findings indicate that specific LILRB1 alleles that allow for superior immune evasion by HCMV are restricted by mutations that limit LILRB1 expression selectively on NK cells. The polymorphisms also maintained an appropriate interaction with HLA-G, fitting with a principal role of LILRB1 in fetal tolerance.
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Affiliation(s)
- Kang Yu
- Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
| | - Chelsea L Davidson
- Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
| | - Agnieszka Wójtowicz
- Infectious Diseases Service, University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Luiz Lisboa
- Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada.,Department of Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - Ting Wang
- Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
| | - Adriana M Airo
- Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
| | - Jean Villard
- Immunology and Transplant Unit, Service of Nephrology, Geneva University Hospital, Geneva, Switzerland
| | - Jeremie Buratto
- Science for Life Laboratory, Department of Medicine Solna, Karolinska Institute, and Department of Infectious Diseases, Karolinska University Hospital, Solna, Stockholm, Sweden
| | - Tatyana Sandalova
- Science for Life Laboratory, Department of Medicine Solna, Karolinska Institute, and Department of Infectious Diseases, Karolinska University Hospital, Solna, Stockholm, Sweden
| | - Adnane Achour
- Science for Life Laboratory, Department of Medicine Solna, Karolinska Institute, and Department of Infectious Diseases, Karolinska University Hospital, Solna, Stockholm, Sweden
| | - Atul Humar
- Multi-Organ Transplant Program, University of Toronto, Toronto, Ontario, Canada
| | - Katia Boggian
- Division of Infectious Diseases and Hospital Epidemiology, Cantonal Hospital St. Gallen, St. Gallen, Switzerland
| | - Alexia Cusini
- Department of Infectious Diseases and Hospital Epidemiology, Bern University Hospital and University of Bern, Bern, Switzerland
| | - Christian van Delden
- Transplant Infectious Diseases Unit, University Hospitals Geneva, Geneva, Switzerland
| | - Adrian Egli
- Division of Clinical Microbiology, University Hospital Basel, Basel, Switzerland.,Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Oriol Manuel
- Infectious Diseases Service and Transplantation Center, University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Nicolas Mueller
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Pierre-Yves Bochud
- Infectious Diseases Service, University Hospital and University of Lausanne, Lausanne, Switzerland
| | | | - Deborah N Burshtyn
- Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada
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5
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Waters S, Brook E, Lee S, Estiasari R, Ariyanto I, Price P. HIV patients, healthy aging and transplant recipients can reveal the hidden footprints of CMV. Clin Immunol 2017; 187:107-112. [PMID: 29108855 DOI: 10.1016/j.clim.2017.11.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Revised: 08/24/2017] [Accepted: 11/01/2017] [Indexed: 12/13/2022]
Abstract
Cytomegalovirus (CMV) is a β-herpesvirus. Latent infections are common in all populations. However age-associated increases in levels of CMV-reactive antibody are testament to repeated reactivations and periods of viral replication. CMV has been associated with several diseases of aging, including vasculopathy and neurocognitive impairment. These conditions occur at a younger age in persons with particularly high burdens of CMV - transplant recipients and people living with HIV. Here we define the "clinical footprints" as immunopathologies triggered by CMV that develop over many years. A high burden of CMV also drives accumulation of multifunctional terminally-differentiated αβ T-cells, a novel population of Vδ2- γδ T-cells, and a population of CD56lo NK cells lacking a key regulatory molecule. An understanding of these "immunological footprints" of CMV may reveal how they collectively promote the "clinical footprints" of the virus. This is explored here in transplant recipients, HIV patients and healthy aging.
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Affiliation(s)
- Shelley Waters
- School of Biomedical Science, Curtin University, Bentley, Australia
| | - Emily Brook
- School of Biomedical Science, Curtin University, Bentley, Australia
| | - Silvia Lee
- School of Biomedical Science, Curtin University, Bentley, Australia; Department of Microbiology, Pathwest Laboratory Medicine, Fiona Stanley Hospital, Australia
| | - Riwanti Estiasari
- Faculty of Medicine, Universitas Indonesia and Cipto Mangunkusumo Hospital, Jakarta, Indonesia
| | - Ibnu Ariyanto
- Faculty of Medicine, Universitas Indonesia and Cipto Mangunkusumo Hospital, Jakarta, Indonesia
| | - Patricia Price
- School of Biomedical Science, Curtin University, Bentley, Australia; Faculty of Medicine, Universitas Indonesia and Cipto Mangunkusumo Hospital, Jakarta, Indonesia.
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Waters S, Lee S, Affandi JS, Irish A, Price P. The effect of genetic variants affecting NK cell function on cardiovascular health and the burden of CMV. Hum Immunol 2017; 78:747-751. [PMID: 28987961 DOI: 10.1016/j.humimm.2017.10.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 10/03/2017] [Accepted: 10/04/2017] [Indexed: 12/14/2022]
Abstract
Renal transplant recipients (RTR) display high burdens of cytomegalovirus (CMV) and accelerated cardiovascular change. NK cells can control CMV and may contribute to vascular pathologies. Polymorphisms in genes encoding the inhibitory receptor LILRB1 and its ligand HLA-G, and the activating receptor NKG2C may illuminate the role of NK cells in vascular health and CMV immunity. We assessed 81 healthy adults and 82 RTR >2 years after transplantation. RTR had higher humoral and T-cell responses to CMV, and impaired vascular health. A 14bp indel in HLA-G associated with increased flow-mediated dilatation of the brachial artery. The T allele of LILRB1 rs1061680 associated with increased carotid intimal media thickness (cIMT) in RTR and controls. A 16 kb deletion encompassing the NKG2C gene associated with lower cIMT values and higher humoral and T-cell responses to CMV. Hence all polymorphisms tested had small but discernable effects on vascular health. The NKG2C deletion may act via CMV.
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Affiliation(s)
- Shelley Waters
- School of Biomedical Science, Curtin University, Bentley, Australia
| | - Silvia Lee
- School of Biomedical Science, Curtin University, Bentley, Australia; Department of Microbiology and Infectious Diseases, Pathwest Laboratory Medicine, Australia
| | | | - Ashley Irish
- Renal Unit, Fiona Stanley Hospital, Murdoch, Australia; School of Medicine and Pharmacology, University of Western Australia, Australia
| | - Patricia Price
- School of Biomedical Science, Curtin University, Bentley, Australia.
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7
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Li XP, Hu YH. CD94 of tongue sole Cynoglossus semilaevis binds a wide arrange of bacteria and possesses antibacterial activity. FISH & SHELLFISH IMMUNOLOGY 2016; 58:641-649. [PMID: 27720695 DOI: 10.1016/j.fsi.2016.10.005] [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: 04/28/2016] [Revised: 10/01/2016] [Accepted: 10/03/2016] [Indexed: 06/06/2023]
Abstract
In this study, we examined the expression patterns and the functions of the tongue sole Cynoglossus semilaevis CD94, CsCD94. CsCD94 is composed of 209 amino acid residues and shares 43.0-50.2% overall identities with known teleost CD94 sequence. CsCD94 has a C-type lectin-like domain. Expression of CsCD94 occurred in multiple tissues and was upregulated during bacterial infection. Recombinant CsCD94 (rCsCD94) exhibited apparent binding and agglutinating activities against both Gram-positive and Gram-negative bacteria in a Ca2+-dependent manner. Treatment of bacteria with rCsCD94 enhanced phagocytosis of the bacteria by peripheral blood leukocytes. Furthermore, incubation of rCsCD94 with bacteria reduced the survival of the bacteria in vitro. Taken together, these results indicate that rCsCD94 is a key factor in the bactericidal and phagocytic effects of tongue sole, and reveal for the first time an essential role of fish CD94 in antibacterial immunity, thereby adding insight into the function of CD94.
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Affiliation(s)
- Xue-Peng Li
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; University of Chinese Academy of Sciences, Beijing, China
| | - Yong-Hua Hu
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China.
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8
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Kang X, Kim J, Deng M, John S, Chen H, Wu G, Phan H, Zhang CC. Inhibitory leukocyte immunoglobulin-like receptors: Immune checkpoint proteins and tumor sustaining factors. Cell Cycle 2016; 15:25-40. [PMID: 26636629 PMCID: PMC4825776 DOI: 10.1080/15384101.2015.1121324] [Citation(s) in RCA: 135] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Inhibitory leukocyte immunoglobulin-like receptors (LILRBs 1-5) transduce signals via intracellular immunoreceptor tyrosine-based inhibitory motifs (ITIMs) that recruit protein tyrosine phosphatase non-receptor type 6 (PTPN6 or SHP-1), protein tyrosine phosphatase non-receptor type 11 (PTPN11 or SHP-2), or Src homology 2 domain-containing inositol phosphatase (SHIP), leading to negative regulation of immune cell activation. Certain of these receptors also play regulatory roles in neuronal activity and osteoclast development. The activation of LILRBs on immune cells by their ligands may contribute to immune evasion by tumors. Recent studies found that several members of LILRB family are expressed by tumor cells, notably hematopoietic cancer cells, and may directly regulate cancer development and relapse as well as the activity of cancer stem cells. LILRBs thus have dual concordant roles in tumor biology - as immune checkpoint molecules and as tumor-sustaining factors. Importantly, the study of knockout mice indicated that LILRBs do not affect hematopoiesis and normal development. Therefore LILRBs may represent ideal targets for tumor treatment. This review aims to summarize current knowledge on expression patterns, ligands, signaling, and functions of LILRB family members in the context of cancer development.
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Affiliation(s)
- Xunlei Kang
- a Department of Physiology , University of Texas Southwestern Medical Center , Dallas , TX , USA
| | - Jaehyup Kim
- a Department of Physiology , University of Texas Southwestern Medical Center , Dallas , TX , USA
| | - Mi Deng
- a Department of Physiology , University of Texas Southwestern Medical Center , Dallas , TX , USA
| | - Samuel John
- a Department of Physiology , University of Texas Southwestern Medical Center , Dallas , TX , USA
| | - Heyu Chen
- a Department of Physiology , University of Texas Southwestern Medical Center , Dallas , TX , USA
| | - Guojin Wu
- a Department of Physiology , University of Texas Southwestern Medical Center , Dallas , TX , USA
| | - Hiep Phan
- a Department of Physiology , University of Texas Southwestern Medical Center , Dallas , TX , USA
| | - Cheng Cheng Zhang
- a Department of Physiology , University of Texas Southwestern Medical Center , Dallas , TX , USA
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9
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Makwana NB, Foley B, Lee S, Fernandez S, Irish AB, Price P. Asymptomatic CMV infections in long-term renal transplant recipients are associated with the loss of FcRγ from LIR-1+NK cells. Eur J Immunol 2016; 46:2597-2608. [DOI: 10.1002/eji.201646422] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 07/18/2016] [Accepted: 08/23/2016] [Indexed: 12/25/2022]
Affiliation(s)
- Nandini B. Makwana
- Pathology and Laboratory Medicine; University of Western Australia; Nedlands Australia
- Biomedical Science; Curtin University; Bentley Australia
| | - Bree Foley
- Telethon Kids Institute; University of Western Australia; Subiaco Australia
| | - Silvia Lee
- Biomedical Science; Curtin University; Bentley Australia
- Microbiology; Royal Perth Hospital; Perth Australia
| | - Sonia Fernandez
- Pathology and Laboratory Medicine; University of Western Australia; Nedlands Australia
| | - Ashley B. Irish
- Nephrology and Renal Transplantation; Fiona Stanley Hospital; Murdoch Australia
| | - Patricia Price
- Biomedical Science; Curtin University; Bentley Australia
- CHIRI; Curtin University; Bentley Australia
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10
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Waggoner SN, Mavilio D. Editorial: Natural killer cells "strike" a new cord. J Leukoc Biol 2016; 100:449-51. [PMID: 27587377 DOI: 10.1189/jlb.1ce0416-181rr] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 05/05/2016] [Indexed: 11/24/2022] Open
Affiliation(s)
- Stephen N Waggoner
- Center for Autoimmune Genomics and Etiology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA; Department of Pediatrics, University of Cincinnati Medical School, Cincinnati, Ohio, USA
| | - Domenico Mavilio
- Department of Medical Biotechnologies and Translational Medicine, University of Milan, Milan, Italy; and Unit of Clinical and Experimental Immunology, Humanitas Clinical and Research Center, Rozzano, Milan, Italy
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Affandi JS, Montgomery J, Lee S, Price P. HIV patients stable on ART retain evidence of a high CMV load but changes to Natural Killer cell phenotypes reflect both HIV and CMV. AIDS Res Ther 2015; 12:41. [PMID: 26664457 PMCID: PMC4673723 DOI: 10.1186/s12981-015-0080-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 11/11/2015] [Indexed: 12/03/2022] Open
Abstract
Background Whilst ART corrects many effects of HIV disease, T cell populations retain features of accelerated immunological aging. Methods Here we analyse phenotypic changes to natural killer (NK) cells in HIV patients who began ART with <200 CD4 T-cells/µl and maintained virological control for 12–17 years, compared with CMV seropositive and seronegative healthy control donors. Results Humoral responses to CMV antigens (lysate, gB, IE-1) remain elevated in the patients (P < 0.0001) despite the long duration of ART. Patient’s NK cells responded poorly to K562 cells when assessed by CD107a and IFNγ, but this could not be attributed to CMV as responses were low in CMV-seronegative controls. Moreover HIV (and not CMV) increased expression of CD57 on CD56lo cells. Conclusions Comparisons with published studies suggest that CMV accelerates age-related increases in CD57 expression but levels plateau by 60–70 years of age, so the effect of CMV disappears. In HIV patients the plateau is higher and perhaps reached sooner. Electronic supplementary material The online version of this article (doi:10.1186/s12981-015-0080-9) contains supplementary material, which is available to authorized users.
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12
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Classical and non-classical MHC I molecule manipulation by human cytomegalovirus: so many targets—but how many arrows in the quiver? Cell Mol Immunol 2014; 12:139-53. [PMID: 25418469 PMCID: PMC4654289 DOI: 10.1038/cmi.2014.105] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 09/26/2014] [Accepted: 09/26/2014] [Indexed: 02/07/2023] Open
Abstract
Major mechanisms for the recognition of pathogens by immune cells have evolved to employ classical and non-classical major histocompatibility complex class I (MHC I) molecules. Classical MHC I molecules present antigenic peptide ligands on infected cells to CD8+ T cells, whereas a key function for non-classical MHC I molecules is to mediate inhibitory or activating stimuli in natural killer (NK) cells. The structural diversity of MHC I puts immense pressure on persisting viruses, including cytomegaloviruses. The very large coding capacity of the human cytomegalovirus allows it to express a whole arsenal of immunoevasive factors assigned to individual MHC class I targets. This review summarizes achievements from more than two decades of intense research on how human cytomegalovirus manipulates MHC I molecules and escapes elimination by the immune system.
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13
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Wang X, Meng X, Zheng Y, Jiang J, Yang B, Liu Y, Zhai F, Cheng X. Increased frequency of ILT2-expressing CD56dimCD16+ NK cells correlates with disease severity of pulmonary tuberculosis. Tuberculosis (Edinb) 2014; 94:469-74. [DOI: 10.1016/j.tube.2014.03.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 03/30/2014] [Indexed: 10/25/2022]
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14
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Arnold V, Cummings JS, Moreno-Nieves UY, Didier C, Gilbert A, Barré-Sinoussi F, Scott-Algara D. S100A9 protein is a novel ligand for the CD85j receptor and its interaction is implicated in the control of HIV-1 replication by NK cells. Retrovirology 2013; 10:122. [PMID: 24156302 PMCID: PMC3826667 DOI: 10.1186/1742-4690-10-122] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Accepted: 10/21/2013] [Indexed: 01/15/2023] Open
Abstract
Background The reportedly broad expression of CD85j across different immune cell types suggests an importance for this molecule in the human immune system. Previous reports have shown that this receptor interacts with several HLA class-I molecules, as well as with some viral proteins. We have demonstrated that the subset of CD85j + Natural Killer (NK) cells efficiently controls human immunodeficiency virus type 1 (HIV-1) replication in monocyte-derived dendritic cells (MDDC) in vitro and this led us to hypothesize that the CD85j + NK cell-mediated anti-HIV activity in MDDC is specifically dependent on the interaction between the CD85j receptor and unknown non-HLA class-I ligand(s). Results In this study, we focused our efforts on the identification of these non-described ligands for CD85j. We found that the CD85j receptor interacts with a calcium-binding proteins of the S100 family; namely, S100A9. We further demonstrated that HIV-1 infection of MDDC induces a modulation of S100A9 expression on surface of the MDDC, which potentially influences the anti-HIV-1 activity of human NK cells through a mechanism involving CD85j ligation. Additionally, we showed that stimulation of NK cells with exogenous S100A9 enhances the control of HIV-1 infection in CD4+ T cells. Conclusions Our data show that S100A9 protein, through ligation with CD85j, can stimulate the anti-HIV-1 activity of NK cells.
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Affiliation(s)
| | | | | | | | | | | | - Daniel Scott-Algara
- Department of Virology, Unité de Régulation des Infections Rétrovirales, Institut Pasteur, 25 rue Dr Roux, Paris 75015, France.
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Inhibitory receptors are expressed by Trypanosoma cruzi-specific effector T cells and in hearts of subjects with chronic Chagas disease. PLoS One 2012; 7:e35966. [PMID: 22574131 PMCID: PMC3344843 DOI: 10.1371/journal.pone.0035966] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 03/26/2012] [Indexed: 01/28/2023] Open
Abstract
We had formerly demonstrated that subjects chronically infected with Trypanosoma cruzi show impaired T cell responses closely linked with a process of T cell exhaustion. Recently, the expression of several inhibitory receptors has been associated with T cell dysfunction and exhaustion. In this study, we have examined the expression of the cytotoxic T lymphocyte antigen 4 (CTLA-4) and the leukocyte immunoglobulin like receptor 1 (LIR-1) by peripheral T. cruzi antigen-responsive IFN-gamma (IFN-γ)-producing and total T cells from chronically T. cruzi-infected subjects with different clinical forms of the disease. CTAL-4 expression was also evaluated in heart tissue sections from subjects with severe myocarditis. The majority of IFN-γ-producing CD4+ T cells responsive to a parasite lysate preparation were found to express CTLA-4 but considerably lower frequencies express LIR-1, irrespective of the clinical status of the donor. Conversely, few IFN-γ-producing T cells responsive to tetanus and diphtheria toxoids expressed CTLA-4 and LIR-1. Polyclonal stimulation with anti-CD3 antibodies induced higher frequencies of CD4+CTAL-4+ T cells in patients with severe heart disease than in asymptomatic subjects. Ligation of CTLA-4 and LIR-1 with their agonistic antibodies, in vitro, reduces IFN-γ production. Conversely, CTLA-4 blockade did not improved IFN-γ production in response to T. cruzi antigens. Subjects with chronic T. cruzi infection had increased numbers of CD4+LIR-1+ among total peripheral blood mononuclear cells, relative to uninfected individuals and these numbers decreased after treatment with benznidazole. CTLA-4 was also expressed by CD3+ T lymphocytes infiltrating heart tissues from chronically infected subjects with severe myocarditis. These findings support the conclusion that persistent infection with T. cruzi leads to the upregulation of inhibitory receptors which could alter parasite specific T cell responses in the chronic phase of Chagas disease.
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Engel P, Angulo A. Viral Immunomodulatory Proteins: Usurping Host Genes as a Survival Strategy. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2012; 738:256-76. [DOI: 10.1007/978-1-4614-1680-7_15] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Le Garff-Tavernier M, Béziat V, Decocq J, Siguret V, Gandjbakhch F, Pautas E, Debré P, Merle-Beral H, Vieillard V. Human NK cells display major phenotypic and functional changes over the life span. Aging Cell 2010; 9:527-35. [PMID: 20477761 DOI: 10.1111/j.1474-9726.2010.00584.x] [Citation(s) in RCA: 212] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Aging is generally associated with an increased predisposition to infectious diseases and cancers, related in part to the development of immune senescence, a process that affects all cell compartments of the immune system. Although many studies have investigated the effects of age on natural killer (NK) cells, their conclusions remain controversial because the diverse health status of study subjects resulted in discordant findings. To clarify this situation, we conducted the first extensive phenotypic and functional analysis of NK cells from healthy subjects, comparing NK cells derived from newborn (cord blood), middle-aged (18-60 years), old (60-80 years), and very old (80-100 years) subjects. We found that NK cells in cord blood displayed specific features associated with immaturity, including poor expression of KIR and LIR-1/ILT-2 and high expression of both NKG2A and IFN-gamma. NK cells from older subjects, on the other hand, preserved their major phenotypic and functional characteristics, but with their mature features accentuated. These include a profound decline of the CD56(bright) subset, a specific increase in LIR-1/ILT-2, and a perfect recovering of NK-cell function following IL2-activation in very old subjects. We conclude that the preservation of NK cell features until very advanced age may contribute to longevity and successful aging.
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Monsiváis-Urenda A, Noyola-Cherpitel D, Hernández-Salinas A, García-Sepúlveda C, Romo N, Baranda L, López-Botet M, González-Amaro R. Influence of human cytomegalovirus infection on the NK cell receptor repertoire in children. Eur J Immunol 2010; 40:1418-27. [PMID: 20201038 DOI: 10.1002/eji.200939898] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Human cytomegalovirus (hCMV) infection is usually asymptomatic but may cause disease in immunocompromised hosts. It has been reported that hCMV infection may shape the NK cell receptor (NKR) repertoire in adult individuals, promoting a variable expansion of the CD94/NKG2C+ NK cell subset. We explored the possible relationship between this viral infection and the expression pattern of different NKR including CD94/NKG2C, CD94/NKG2A, immunoglobulin-like transcript 2 (ILT2, CD85j), KIR2DL1/2DS1, KIR3DL1, and CD161 in peripheral blood lymphocytes from healthy children, seropositive (n=21) and seronegative (n=20) for hCMV. Consistent with previous observations in adults, a positive serology for hCMV was associated with increased numbers of NKG2C+ NK and T cells as well as with ILT2+ T lymphocytes. Moreover, the proportions of CD161+ and NKG2C+CD56-CD3- NK cells also tended to be increased in hCMV+ individuals. Excretion of the virus was associated with higher proportions of NKG2C+ NK cells. Altogether, these data reveal that hCMV may have a profound influence on the NKR repertoire in early childhood.
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Affiliation(s)
- Adriana Monsiváis-Urenda
- Department of Immunology, Facultad de Medicina, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
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19
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Petersen L, Petersen CC, Møller-Larsen A, Hokland ME. Short-term exposure to human cytomegalovirus-infected fibroblasts induces a proportional increase of active CD94/NKG2A(+) natural killer cells. Hum Immunol 2010; 71:29-35. [PMID: 19782712 DOI: 10.1016/j.humimm.2009.09.355] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2009] [Revised: 09/04/2009] [Accepted: 09/17/2009] [Indexed: 12/14/2022]
Abstract
Natural killer (NK) cells are essential components of the immune response against human cytomegalovirus (HCMV). As NK cells are part of the innate immune system providing an immediate defense against pathogens, short-term exposure to HCMV-infected cells may induce changes in the phenotype and function of these cells. To identify immediate reactions of NK cells to HCMV, we co-cultured peripheral blood mononuclear cells with HCMV-infected fibroblasts for 24 and 72 hours. A distinct, HCMV-mediated, proportional enlargement of a subset of NK cells expressing CD94/NKG2A was sustained throughout the period of incubation. As preceding studies have shown that HCMV can cause an increase in CD94/NKG2C(+) NK cells, our results were surprising. The NK cells showed intense upregulation of the early activation marker CD69 in response to HCMV. The CD94/NKG2A(+) NK cells demonstrated the highest expression of CD69. Studies of HCMV-induced interferon-gamma expression after 24 hours of co-culture showed that this cytokine was almost exclusively produced by the CD94/NKG2A(+) subset of NK cells. In summary, our data demonstrate that HCMV induces an immediate proportional enlargement of a functionally active CD94/NKG2A expressing subset of NK cells.
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Affiliation(s)
- Line Petersen
- Institute of Medical Microbiology and Immunology, University of Aarhus, Denmark.
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20
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Pita-Lopez ML, Gayoso I, DelaRosa O, Casado JG, Alonso C, Muñoz-Gomariz E, Tarazona R, Solana R. Effect of ageing on CMV-specific CD8 T cells from CMV seropositive healthy donors. IMMUNITY & AGEING 2009; 6:11. [PMID: 19715573 PMCID: PMC2741428 DOI: 10.1186/1742-4933-6-11] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2009] [Accepted: 08/28/2009] [Indexed: 01/09/2023]
Abstract
BACKGROUND Ageing is associated with changes in the immune system with substantial alterations in T-lymphocyte subsets. Cytomegalovirus (CMV) is one of the factors that affect functionality of T cells and the differentiation and large expansions of CMV pp65-specific T cells have been associated with impaired responses to other immune challenges. Moreover, the presence of clonal expansions of CMV-specific T cells may shrink the available repertoire for other antigens and contribute to the increased incidence of infectious diseases in the elderly. In this study, we analyse the effect of ageing on the phenotype and frequency of CMV pp65-specific CD8 T cell subsets according to the expression of CCR7, CD45RA, CD27, CD28, CD244 and CD85j. RESULTS Peripheral blood from HLA-A2 healthy young, middle-aged and elderly donors was analysed by multiparametric flow cytometry using the HLA-A*0201/CMV pp65(495-504) (NLVPMVATV) pentamer and mAbs specific for the molecules analysed. The frequency of CMV pp65-specific CD8 T cells was increased in the elderly compared with young and middle-aged donors. The proportion of naïve cells was reduced in the elderly, whereas an age-associated increase of the CCR7(null) effector-memory subset, in particular those with a CD45RA(dim) phenotype, was observed, both in the pentamer-positive and pentamer-negative CD8 T cells. The results also showed that most CMV pp65-specific CD8 T cells in elderly individuals were CD27/CD28 negative and expressed CD85j and CD244. CONCLUSION The finding that the phenotype of CMV pp65-specific CD8 T cells in elderly individuals is similar to the predominant phenotype of CD8 T cells as a whole, suggests that CMV persistent infections contributes to the age-related changes observed in the CD8 T cell compartment, and that chronic stimulation by other persistent antigens also play a role in T cell immunosenescence. Differences in subset distribution in elderly individuals showing a decrease in naive and an increase in effector-memory CD8 T cells may be relevant in the age-associated defective immune response.
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Affiliation(s)
- María Luisa Pita-Lopez
- University of Cordoba, Department of Cellular Biology, Physiology and Immunology, Faculty of Medicine, Cordoba, Spain.
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21
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Miller-Kittrell M, Sparer TE. Feeling manipulated: cytomegalovirus immune manipulation. Virol J 2009; 6:4. [PMID: 19134204 PMCID: PMC2636769 DOI: 10.1186/1743-422x-6-4] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Accepted: 01/09/2009] [Indexed: 02/03/2023] Open
Abstract
No one likes to feel like they have been manipulated, but in the case of cytomegalovirus (CMV) immune manipulation, we do not really have much choice. Whether you call it CMV immune modulation, manipulation, or evasion, the bottom line is that CMV alters the immune response in such a way to allow the establishment of latency with lifelong shedding. With millions of years of coevolution within their hosts, CMVs, like other herpesviruses, encode numerous proteins that can broadly influence the magnitude and quality of both innate and adaptive immune responses. These viral proteins include both homologues of host proteins, such as MHC class I or chemokine homologues, and proteins with little similarity to any other known proteins, such as the chemokine binding protein. Although a strong immune response is launched against CMV, these virally encoded proteins can interfere with the host's ability to efficiently recognize and clear virus, while others induce or alter specific immune responses to benefit viral replication or spread within the host. Modulation of host immunity allows survival of both the virus and the host. One way of describing it would be a kind of "mutually assured survival" (as opposed to MAD, Mutually Assured Destruction). Evaluation of this relationship provides important insights into the life cycle of CMV as well as a greater understanding of the complexity of the immune response to pathogens in general.
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Affiliation(s)
- Mindy Miller-Kittrell
- Department of Microbiology, University of Tennessee, 1414 Cumberland Ave, Knoxville, TN, USA.
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22
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Britt W. Manifestations of human cytomegalovirus infection: proposed mechanisms of acute and chronic disease. Curr Top Microbiol Immunol 2008; 325:417-70. [PMID: 18637519 DOI: 10.1007/978-3-540-77349-8_23] [Citation(s) in RCA: 224] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Infections with human cytomegalovirus (HCMV) are a major cause of morbidity and mortality in humans with acquired or developmental deficits in innate and adaptive immunity. In the normal immunocompetent host, symptoms rarely accompany acute infections, although prolonged virus shedding is frequent. Virus persistence is established in all infected individuals and appears to be maintained by both a chronic productive infections as well as latency with restricted viral gene expression. The contributions of the each of these mechanisms to the persistence of this virus in the individual is unknown but frequent virus shedding into the saliva and genitourinary tract likely accounts for the near universal incidence of infection in most populations in the world. The pathogenesis of disease associated with acute HCMV infection is most readily attributable to lytic virus replication and end organ damage either secondary to virus replication and cell death or from host immunological responses that target virus-infected cells. Antiviral agents limit the severity of disease associated with acute HCMV infections, suggesting a requirement for virus replication in clinical syndromes associated with acute infection. End organ disease secondary to unchecked virus replication can be observed in infants infected in utero, allograft recipients receiving potent immunosuppressive agents, and patients with HIV infections that exhibit a loss of adaptive immune function. In contrast, diseases associated with chronic or persistent infections appear in normal individuals and in the allografts of the transplant recipient. The manifestations of these infections appear related to chronic inflammation, but it is unclear if poorly controlled virus replication is necessary for the different phenotypic expressions of disease that are reported in these patients. Although the relationship between HCMV infection and chronic allograft rejection is well known, the mechanisms that account for the role of this virus in graft loss are not well understood. However, the capacity of this virus to persist in the midst of intense inflammation suggests that its persistence could serve as a trigger for the induction of host-vs-graft responses or alternatively host responses to HCMV could contribute to the inflammatory milieu characteristic of chronic allograft rejection.
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Affiliation(s)
- W Britt
- Department of Pediatrics, University of Alabama School of Medicine, Childrens Hospital, Harbor Bldg. 104, 1600 7th Ave. South Birmingham, AL 35233, USA.
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23
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Jonjić S, Babić M, Polić B, Krmpotić A. Immune evasion of natural killer cells by viruses. Curr Opin Immunol 2008; 20:30-8. [PMID: 18206359 DOI: 10.1016/j.coi.2007.11.002] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2007] [Revised: 11/07/2007] [Accepted: 11/09/2007] [Indexed: 01/22/2023]
Abstract
Natural killer (NK) cells are important in the host resistance to viral infections. They are among the first cells to sense the release of proinflammatory cytokines, as well as the downregulation of surface MHC class I molecules and molecules induced by viral invasion of cells. Various viral functions have evolved to counter NK cell responses illustrating the evolutionary struggles between viruses and NK cells. Ligands for NK cell receptors are primary targets for viral immunoevasion. In order to counteract NK cell activation via the 'missing self'-axis, viruses encode proteins which serve as ligands for inhibitory NK cell receptors. Viruses also downmodulate the ligands for the activating NK cell receptors and encode soluble ligands which block these receptors. In addition to viral immunoregulatory proteins, regulatory RNAs can also inhibit the expression of ligands for NK cell receptors. Improving our understanding of viral regulation of NK cell function could be essential for designing more efficient measures in the prophylaxis and treatment of virus-induced pathology.
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Affiliation(s)
- Stipan Jonjić
- Department of Histology and Embryology, Faculty of Medicine, University of Rijeka, Brace Branchetta 20, 51000 Rijeka, Croatia.
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24
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Wagner CS, Ljunggren HG, Achour A. Immune modulation by the human cytomegalovirus-encoded molecule UL18, a mystery yet to be solved. THE JOURNAL OF IMMUNOLOGY 2008; 180:19-24. [PMID: 18096997 DOI: 10.4049/jimmunol.180.1.19] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Human cytomegalovirus infects human populations at a high frequency worldwide. During the long coevolution of virus and host, a fine balance has developed between viral immune evasion strategies and defense mechanisms of the immune system. Human cytomegalovirus encodes multiple proteins involved in the evasion of immune recognition, among them UL18, a MHC class I homologue. Despite almost 20 years of research and the discovery of a broadly expressed inhibitory receptor for this protein, its function in immune modulation is not clear yet. Recent data suggest that besides inhibitory effects on various immune cells, UL18 may also act as an activating component during CMV infection. In this review, we provide an overview of the biology of UL18 and discuss several attempts to shed light on its function.
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Affiliation(s)
- Claudia S Wagner
- Center for Infectious Medicine, Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden.
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25
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Maffei M, Ghiotto F, Occhino M, Bono M, De Santanna A, Battini L, Gusella GL, Fais F, Bruno S, Ciccone E. Human cytomegalovirus regulates surface expression of the viral protein UL18 by means of two motifs present in the cytoplasmic tail. THE JOURNAL OF IMMUNOLOGY 2008; 180:969-79. [PMID: 18178837 DOI: 10.4049/jimmunol.180.2.969] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
UL18 is a trans-membrane viral protein expressed on human cytomegalovirus (HCMV)-infected cells, and its surface expression determines the interaction of infected cells with lymphocytes expressing the CD85j (LIR-1/ILT2) receptor. We previously showed that the UL18-CD85j interaction elicits activation of T lymphocytes. However, in in vitro cell models UL18 displays mostly undetectable surface expression. Thus, we asked how surface expression of UL18 is regulated. Domain-swapping experiments and construction of specific mutants demonstrated that two motifs on its cytoplasmic tail, homologous to YXXPhi and KKXX consensus sequences, respectively, are responsible for impairing UL18 surface expression. However, the presence of the whole HCMV genome, granted by HCMV infection of human fibroblasts, restored surface expression of either UL18 or chimeric proteins carrying the UL18 cytoplasmic tail, starting from the third day after infection. It is of note that the two motifs responsible for cytoplasmic retention are identical in all 17 HCMV strains examined. We disclosed a control mechanism used by the HCMV to regulate the availability of UL18 on the infected-cell surface to allow interaction with its ligand on T and NK cells.
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Affiliation(s)
- Massimo Maffei
- Human Anatomy Section, Department of Experimental Medicine, University of Genoa, Genova, Italy
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26
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Occhino M, Ghiotto F, Soro S, Mortarino M, Bosi S, Maffei M, Bruno S, Nardini M, Figini M, Tramontano A, Ciccone E. Dissecting the structural determinants of the interaction between the human cytomegalovirus UL18 protein and the CD85j immune receptor. THE JOURNAL OF IMMUNOLOGY 2008; 180:957-68. [PMID: 18178836 DOI: 10.4049/jimmunol.180.2.957] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
UL18 is a glycoprotein encoded by the human cytomegalovirus genome and is thought to play a pivotal role during human cytomegalovirus infection, although its exact function is still a matter of debate. UL18 shares structural similarity with MHC class I and binds the receptor CD85j on immune cells. Besides UL18, CD85j binds MHC class I molecules. The binding properties of CD85j to MHC class I molecules have been thoroughly studied. Conversely, very little information is available on the CD85j/UL18 complex, namely that UL18 binds CD85j through its alpha3 domain with an affinity that is approximately 1000-fold higher than the MHC class I affinity for CD85j. Deeper knowledge of features of the UL18/CD85j complex would help to disclose the function of UL18 when it binds to CD85j. In this study we first demonstrated that the UL18alpha3 domain is not sufficient per se for binding and that beta2-microglobulin is necessary for UL18-CD85j interaction. We then dissected structural determinants of binding UL18 to CD85j. To this end, we constructed a three-dimensional model of the complex. The model was used to design mutants in selected regions of the putative interaction interface, the effects of which were measured on binding. Six regions in both the alpha2 and alpha3 domains and specific amino acids within them were identified that are potentially involved in the UL18-CD85j interaction. The higher affinity of UL18 to CD85j, compared with MHC class I, seems to be due not to additional interaction regions but to an overall better fit of the two molecules.
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Affiliation(s)
- Marzia Occhino
- Department of Experimental Medicine, University of Genoa, Genoa, Italy
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27
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Lenac T, Arapović J, Traven L, Krmpotić A, Jonjić S. Murine cytomegalovirus regulation of NKG2D ligands. Med Microbiol Immunol 2008; 197:159-66. [PMID: 18259774 DOI: 10.1007/s00430-008-0080-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2007] [Indexed: 11/27/2022]
Abstract
Human cytomegalovirus (HCMV) is a ubiquitous pathogen that causes morbidity risk in immunologically suppressed and immunodeficient patients including congenital infections. Approaches to curb the consequences of HCMV infections are restricted by a lack of complete understanding of viral pathogenesis. The infection of mice with murine cytomegalovirus (MCMV) as a model of HCMV infection has been particularly useful in elucidating the role of innate and adaptive immune response mechanisms. A large number of cytomegalovirus genes modulate the innate and the adaptive host immune response. The products of several MCMV genes are involved in subverting the natural killer (NK) cell response by down-modulating cellular ligands for the NKG2D receptor expressed on NK cells and CD8(+) T cells. Mutant viruses lacking these immunoevasion genes are attenuated with respect to virus growth in vivo. Given the importance of the NKG2D receptor in controlling both NK- and T cell-mediated immunity, it is of tremendous importance to understand the molecular mechanisms and consequences of viral regulation of the NKG2D ligands.
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Affiliation(s)
- Tihana Lenac
- Department of Histology and Embryology, Faculty of Medicine, University of Rijeka, B. Branchetta 20, 51000 Rijeka, Croatia
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28
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Wagner CS, Walther-Jallow L, Buentke E, Ljunggren HG, Achour A, Chambers BJ. Human cytomegalovirus-derived protein UL18 alters the phenotype and function of monocyte-derived dendritic cells. J Leukoc Biol 2008; 83:56-63. [PMID: 17898320 DOI: 10.1189/jlb.0307181] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Human cytomegalovirus (HCMV) encodes the MHC class I-like molecule UL18, which binds with high affinity to the leukocyte Ig-like receptor-1 (LIR-1), an inhibitory receptor commonly expressed on myeloid cells and subsets of NK and T cells. The exact role of UL18 is not known, in particular in relation to its proposed role in HCMV immune escape. Given the ubiquitous expression of LIR-1 on dendritic cells (DCs), we hypothesized that UL18 may affect DC function. To study the effects of UL18 on DC, we made use of UL18 fusion proteins. We demonstrate that UL18 fusion proteins inhibit the chemotaxis of DCs. Furthermore, UL18 interfered with CD40 ligand-induced maturation of DCs, resulting in reduced allogeneic T cell proliferation. Finally, we demonstrate that UL18 proteins up-regulate the expression of the maturation marker CD83 on immature monocyte-derived DCs and induce cytokine production. The capacity of UL18 to affect the function and the phenotype of DCs suggests a novel role for this HCMV-derived protein.
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Affiliation(s)
- Claudia S Wagner
- Center for Infectious Medicine, Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, 141 86 Stockholm, Sweden.
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29
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Beisser PS, Lavreysen H, Bruggeman CA, Vink C. Chemokines and chemokine receptors encoded by cytomegaloviruses. Curr Top Microbiol Immunol 2008; 325:221-42. [PMID: 18637509 DOI: 10.1007/978-3-540-77349-8_13] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
CMVs carry several genes that are homologous to genes of the host organism. These include genes homologous to those encoding chemokines (CKs) and G protein-coupled receptors (GPCRs). It is generally assumed that these CMV genes were hijacked from the host genome during the long co-evolution of virus and host. In light of the important function of the CK and GPCR families in the normal physiology of the host, it has previously been hypothesized that the CMV homologs of these proteins, CMV vCKs and vGPCRs, may also have a significant impact on this physiology, such that lifelong maintenance and/or replication of the virus within the infected host is guaranteed. In addition, several of these homologs were reported to have a major impact in the pathogenesis of infection. In this review, the current state of knowledge on the CMV vCKs and vGPCRs will be discussed.
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Affiliation(s)
- P S Beisser
- Department of Medical Microbiology, Cardiovascular Research Institute Maastricht, University Hospital Maastricht, PO Box 5800, AZ, Maastricht, The Netherlands
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30
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Abstract
Human cytomegalovirus (HCMV) has become a paradigm for viral immune evasion due to its unique multitude of immune-modulatory strategies. HCMV modulates the innate as well as adaptive immune response at every step of its life cycle. It dampens the induction of antiviral interferon-induced genes by several mechanisms. Further striking is the multitude of genes and strategies devoted to modulating and escaping the cellular immune response. Several genes are independently capable of inhibiting antigen presentation to cytolytic T cells by downregulating MHC class I. Recent data revealed an astounding variety of methods in triggering or inhibiting activatory and inhibitory receptors found on NK cells, NKT cells, T cells as well as auxiliary cells of the immune system. The multitude and complexity of these mechanisms is fascinating and continues to reveal novel insights into the host-pathogen interaction and novel cell biological and immunological concepts.
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Affiliation(s)
- C Powers
- Vaccine and Gene Therapy Institute, Oregon Health and Science University, Portland, OR 97201, USA
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31
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Sundström Y, Nilsson C, Lilja G, Kärre K, Troye-Blomberg M, Berg L. The expression of human natural killer cell receptors in early life. Scand J Immunol 2007; 66:335-44. [PMID: 17635811 DOI: 10.1111/j.1365-3083.2007.01980.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Natural killer (NK) cells play an important role in tumour immunosurveillance and the early defence against viral infections. Recognition of altered cells (i.e. infected- or tumour-cells) is achieved through a multiple receptor recognition strategy which gives the NK cells inhibitory or activating signals depending on the ligands present on the target cell. NK cells originate from the bone marrow where they develop and proliferate. However, further maturation processes and homeostasis of NK cells in peripheral blood are not well understood. To determine the proportions of cells and the expression of NK cell receptors, mononuclear cells from children at three time points during early childhood were compared, i.e. cord blood (CB), 2 and 5 years of age. The proportion of NK cells was high in CB, but the interferon-gamma (IFN-gamma) production low compared to later in life. In contrast, the proportion of T cells was low in CB. This may indicate a deviation of the regulatory function of NK cells in CB compared to later in life, implying an importance of innate immunity in early life before the adaptive immune system matures. Additionally, we found that the proportion of LIR-1(+) NK cells increased with increasing age while CD94(+)NKG2C(-) (NKG2A(+)) NK cells and the level of expression of NKG2D, NKp30 and NKp46 decreased with age. These age related changes in NK cell populations defined by the expression of activating and inhibitory receptors may be the result of pathogen exposure and/or a continuation of the maturation process that begins in the bone marrow.
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Affiliation(s)
- Y Sundström
- Department of Immunology, Wenner-Gren Institute, Stockholm University, Stockholm, Sweden.
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Wagner CS, Rölle A, Cosman D, Ljunggren HG, Berndt KD, Achour A. Structural elements underlying the high binding affinity of human cytomegalovirus UL18 to leukocyte immunoglobulin-like receptor-1. J Mol Biol 2007; 373:695-705. [PMID: 17869268 DOI: 10.1016/j.jmb.2007.08.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2007] [Revised: 08/08/2007] [Accepted: 08/09/2007] [Indexed: 11/26/2022]
Abstract
Human cytomegalovirus (HCMV) encodes UL18, a major histocompatibility complex (MHC) class I homologue that binds to the leukocyte immunoglobulin-like receptor (LIR)-1 (also called ILT2/CD85j/LILRB1), an inhibitory receptor expressed on myeloid and lymphoid immune cells. The molecular basis underlying the high affinity binding of UL18 to LIR-1, compared to MHC class I molecules (MHC-I), is unclear. Based on a comparative structural analysis of a molecular model of UL18 with the crystal structure of the HLA-A2/LIR-1 complex, we identified three regions in UL18 influencing interaction with LIR-1. Comparison of the relative binding affinities of mutated UL18 proteins to LIR-1 demonstrated the importance of specific residues in each region. Substitution of residues K42/A43 and Q202, localized in the alpha1 and alpha3 domains, respectively, reduced binding affinity to LIR-1 nearly by half. The model also suggested the formation of an additional disulfide bridge in the alpha3 domain of UL18 between residues C240 and C255, not present in MHC-I. Substitution of either cysteine residue prevented association of UL18 to beta2m, abolishing binding to LIR-1. All observed differences in binding affinities translated directly into functional consequences in terms of inhibition of IFN-gamma production by T cells, mediated through the UL18-LIR-1 interaction. The larger amount of interacting regions, combined with an increased stability of the alpha3 and beta2m domains allow a higher recognition affinity of UL18 by LIR-1.
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Affiliation(s)
- Claudia S Wagner
- Center for Infectious Medicine, Department of Medicine, Karolinska Institutet, Karolinska University Hospital Huddinge, Stockholm, Sweden
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