3,974 results match your criteria Lymphocytic Choriomeningitis
PLoS One 2018 10;13(9):e0203118. Epub 2018 Sep 10.
Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, United States of America.
Viruses have long been implicated in the pathogenesis of autoimmunity, yet their contribution remains circumstantial partly due to the lack of well-documented information on infections prior to autoimmune disease onset. Here, we used the lymphocytic choriomeningitis virus (LCMV) as a model to mechanistically dissect the impact of viral infection on lupus-like autoimmunity. Virus persistence strongly enhanced disease in mice with otherwise weak genetic predisposition but not in highly predisposed or non-autoimmune mice, indicating a synergistic interplay between genetic susceptibility and virus infection. Read More
Infect Dis Clin North Am 2018 Sep;32(3):495-506
The Warren Alpert Medical School of Brown University, 222 Richmond Street, Providence, RI 02903, USA; Accreditation Council for Graduate Medical Education, 401 North Michigan Avenue, Suite 2000, Chicago, IL 60611, USA. Electronic address:
Infection is an inevitable complication of solid organ transplantation. Unrecognized infection may be transmitted from a donor and result in disseminated disease in the immunosuppressed host. Recent outbreaks of deceased donor-derived infections resulting in high rates of mortality and severe morbidity have emphasized the need to be cautious in using donors with possible meningoencephalitis. Read More
Cell Immunol 2018 Aug 18. Epub 2018 Aug 18.
Biochemical Pharmacology, Department of Biology, University of Konstanz, Germany. Electronic address:
The nuclear receptor Small Heterodimer Partner (SHP) is a transcriptional target and inhibitor of Liver Receptor Homolog 1 (LRH-1), the transcriptional regulator of intestinal glucocorticoid (GC) synthesis. The role of SHP in the regulation of intestinal GC synthesis and its impact on T cell-mediated anti-viral immune responses in the intestinal mucosa are currently not understood. Lymphocytic choriomeningitis virus (LCMV) infection promoted intestinal GC synthesis, which was enhanced in SHP-deficient mice. Read More
Proc Natl Acad Sci U S A 2018 Aug 20. Epub 2018 Aug 20.
Virology and Immunology, Gladstone Institutes, San Francisco, CA 94158;
Identifying novel pathways that promote robust function and longevity of cytotoxic T cells has promising potential for immunotherapeutic strategies to combat cancer and chronic infections. We show that sprouty 1 and 2 (Spry1/2) molecules regulate the survival and function of memory CD8 T cells. Spry1/2 double-knockout (DKO) ovalbumin (OVA)-specific CD8 T cells (OT-I cells) mounted more vigorous autoimmune diabetes than WT OT-I cells when transferred to mice expressing OVA in their pancreatic β-islets. Read More
Sci Rep 2018 Aug 15;8(1):12179. Epub 2018 Aug 15.
Department of Molecular Medicine II, Medical Faculty, Heinrich Heine University, Universitätsstrasse. 1, 40225, Düsseldorf, Germany.
Immune responses are critical for defense against pathogens. However, prolonged viral infection can result in defective T cell immunity, leading to chronic viral infection. We studied immune activation in response to arenavirus infection during cholestasis using bile duct ligation (BDL). Read More
Proc Natl Acad Sci U S A 2018 08 30;115(33):E7814-E7823. Epub 2018 Jul 30.
Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037.
Understanding of T cell exhaustion and successful therapy to restore T cell function was first described using Clone (Cl) 13 variant selected from the lymphocytic choriomeningitis virus (LCMV) Armstrong (ARM) 53b parental strain. T cell exhaustion plays a pivotal role in both persistent infections and cancers of mice and humans. C57BL/6, BALB, SWR/J, A/J, 129, C3H, and all but one collaborative cross (CC) mouse strain following Cl 13 infection have immunosuppressed T cell responses, high PD-1, and viral titers leading to persistent infection and normal life spans. Read More
PLoS Pathog 2018 Jul 20;14(7):e1007172. Epub 2018 Jul 20.
Viral Immunology & Intravital Imaging Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, United States of America.
The interferon inducible protein, BST-2 (or, tetherin), plays an important role in the innate antiviral defense system by inhibiting the release of many enveloped viruses. Consequently, viruses have evolved strategies to counteract the anti-viral activity of this protein. While the mechanisms by which BST-2 prevents viral dissemination have been defined, less is known about how this protein shapes the early viral distribution and immunological defense against pathogens during the establishment of persistence. Read More
Transbound Emerg Dis 2018 Jul 10. Epub 2018 Jul 10.
School of Life Sciences and Engineering, Foshan University, Foshan, China.
Lymphocytic choriomeningitis virus (LCMV) is a rodent-borne arenavirus that is considered a neglected cause of neurologic diseases in humans. In this study, we described genomic characterization of newly isolated LCMVs in Haemaphysalis longicornis, Dermacentor nuttalli, Dermacentor silvarum and Ixodes persulcatus in Jilin Province, northeastern China. The complete sequences of the small (S) and large (L) segments of LCMVs in ticks contained 3,375 and 7,235-7,241 nucleotides, respectively. Read More
J Immunol 2018 Aug 9;201(4):1174-1185. Epub 2018 Jul 9.
Department of Physiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095;
Ca release-activated Ca channel regulator 2A (CRACR2A) is expressed abundantly in T cells and acts as a signal transmitter between TCR stimulation and activation of the Ca/NFAT and JNK/AP1 pathways. CRACR2A has been linked to human diseases in numerous genome-wide association studies and was shown to be one of the most sensitive targets of the widely used statin drugs. However, the physiological role of CRACR2A in T cell functions remains unknown. Read More
Nat Commun 2018 Jul 2;9(1):2561. Epub 2018 Jul 2.
Institute of Immunology, University Hospital Essen, Hufelandstrasse 55, 45147, Essen, Germany.
Dysfunction of CD8 T cells can lead to the development of chronic viral infection. Identifying mechanisms responsible for such T cell dysfunction is therefore of great importance to understand how to prevent persistent viral infection. Here we show using lymphocytic choriomeningitis virus (LCMV) infection that carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) is fundamental for recruiting lymphocyte-specific protein kinase (Lck) into the T cell receptor complex to form an efficient immunological synapse. Read More
Front Immunol 2018 23;9:1127. Epub 2018 May 23.
Institute of Immunology, Third Military Medical University, Chongqing, China.
Follicular helper CD4 T (T) cells are critical for optimal B-cell-mediated humoral immunity by initiating, fueling, and sustaining germinal center reactions. The differentiation of T cells relies on multiple intrinsic and extrinsic factors; however, the details by which these factors are integrated to coordinate T differentiation are largely unknown. In this study, using a mouse model of acute lymphocytic choriomeningitis virus (LCMV) viral infection, we demonstrate that mTOR complex 2 (mTORC2) kinase integrates TCR signaling and ICOS-mediated co-stimulation to promote late differentiation and functional maturation of virus-specific T cells. Read More
Curr Opin Rheumatol 2018 Jul;30(4):365-372
Zabludowicz Center for Autoimmune Diseases, Sheba Medical Center, affiliated to the Sackler Faculty of Medicine Tel-Aviv University.
Purpose Of Review: Infections play a role in the pathogenesis of autoimmune diseases (AID). Several bacterial and viral pathogens play a double role, as both inducers and inhibitors of AID. In this review, we will present current evidence and discuss different aspects of this notion. Read More
J Immunother Cancer 2018 May 29;6(1):41. Epub 2018 May 29.
VA Ann Arbor Healthcare System, 2215 Fuller Road, Ann Arbor, MI, 48105, USA.
Background: Adoptive cell transfer (ACT) is a promising cancer immunotherapeutic strategy that remains ineffective for a large subset of patients. ACT with memory CD8+ T cells (T) has been shown to have superior efficacy compared to traditional ACT with effector CD8+ T cells (T). T and T have complementary physiological advantages for immunotherapy, but previous publications have not examined ACT using a combination of T and T. Read More
Transpl Infect Dis 2018 May 29:e12933. Epub 2018 May 29.
Office of Blood, Organ, and Other Tissue Safety, Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, National Center for Emerging and Zoonotic Infectious Diseases, Atlanta, GA, USA.
Background: There were 13 documented clusters of infectious encephalitis transmission via organ transplant from deceased donors to recipients during 2002-2013. Hence, organs from donors diagnosed with encephalitis are often declined because of concerns about the possibility of infection, given that there is no quick and simple test to detect causes of infectious encephalitis.
Methods: We constructed a database containing cases of infectious and non-infectious encephalitis. Read More
Ecohealth 2018 May 23. Epub 2018 May 23.
Department of Biodiversity and Molecular Ecology, Research and Innovation Center, Fondazione Edmund Mach, Via E. Mach, 1, 38010, San Michele all'Adige, TN, Italy.
Rodent-borne hanta- and arenaviruses are an emerging public health threat in Europe; however, their circulation in human populations is usually underestimated since most infections are asymptomatic. Compared to other European countries, Italy is considered 'low risk' for these viruses, yet in the Province of Trento, two pathogenic hantaviruses (Puumala and Dobrava-Belgrade virus) and one arenavirus (Lymphocytic Choriomeningitis Virus) are known to circulate in rodent reservoirs. In this paper, we performed a follow-up serological screening in humans to detect variation in the prevalence of these three viruses compared to previous analyses carried out in 2002. Read More
J Immunol 2018 Jul 18;201(1):19-30. Epub 2018 May 18.
Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT 84112
TCR affinity for peptide MHC dictates the functional efficiency of T cells and their propensity to differentiate into effectors and form memory. However, in the context of chronic infections, it is unclear what the overall profile of TCR affinity for Ag is and if it differs from acute infections. Using the comprehensive affinity analysis provided by the two-dimensional micropipette adhesion frequency assay and the common indirect affinity evaluation methods of MHC class II tetramer and functional avidity, we tracked IA GP-specific cells in the mouse model of acute (Armstrong) and chronic (clone 13) lymphocytic choriomeningitis virus infection. Read More
Cell Rep 2018 May;23(7):2142-2156
Department of Microbiology and Institute for Immunology, University of Pennsylvania Perelman School Medicine, Philadelphia, PA 19104, USA. Electronic address:
Persistent viral infections and tumors drive development of exhausted T (T) cells. In these settings, T cells establish an important host-pathogen or host-tumor stalemate. However, T cells erode over time, leading to loss of pathogen or cancer containment. Read More
Immunity 2018 May;48(5):937-950.e8
Department of Pathology and Immunology, University of Geneva, Geneva, Switzerland; Division of Clinical Pathology, Geneva University Hospital, Geneva, Switzerland. Electronic address:
Infections are thought to trigger CD8 cytotoxic T lymphocyte (CTL) responses during autoimmunity. However, the transcriptional programs governing the tissue-destructive potential of CTLs remain poorly defined. In a model of central nervous system (CNS) inflammation, we found that infection with lymphocytic choriomeningitis virus (LCMV), but not Listeria monocytogenes (Lm), drove autoimmunity. Read More
IUCrJ 2018 Mar 22;5(Pt 2):223-235. Epub 2018 Feb 22.
Aix-Marseille Université, AFMB UMR 7257, 13288 Marseille, France.
The family, together with the and families, is one of the three negative-stranded RNA viral families that encode an endonuclease in their genome. The endonuclease domain is at the N-terminus of the L protein, a multifunctional protein that includes the RNA-dependent RNA polymerase. The synthesis of mRNA in arenaviruses is a process that is primed by capped nucleotides that are 'stolen' from the cellular mRNA by the endonuclease domain in cooperation with other domains of the L protein. Read More
J Infect Dis 2018 Jul;218(4):522-527
Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan.
Lymphocytic choriomeningitis virus (LCMV) poses a substantial risk to immunocompromised individuals. The case fatality rate in recent clusters of LCMV infection in immunosuppressed organ transplantation recipients has exceeded 70%. In the present study, we demonstrate potent antiviral activity of favipiravir against acute, disseminated LCMV infection in NZB mice. Read More
PLoS Pathog 2018 05 7;14(5):e1007053. Epub 2018 May 7.
Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, Missouri, United States of America.
CD4 T cell-mediated help to CD8 T cells and B cells is a critical arm of the adaptive immune system required for control of pathogen infection. CD4 T cells express cytokines and co-stimulatory molecules that support a sustained CD8 T cell response and also enhance generation of protective antibody by germinal center B cells. However, the molecular components that modulate CD4 T cell functions in response to viral infection or vaccine are incompletely understood. Read More
Science 2018 05;360(6388):558-563
Faculty of Medicine, Imperial College London, London W12 ONN, UK.
Deficiency of C1q, the initiator of the complement classical pathway, is associated with the development of systemic lupus erythematosus (SLE). Explaining this association in terms of abnormalities in the classical pathway alone remains problematic because C3 deficiency does not predispose to SLE. Here, using a mouse model of SLE, we demonstrate that C1q, but not C3, restrains the response to self-antigens by modulating the mitochondrial metabolism of CD8 T cells, which can themselves propagate autoimmunity. Read More
Virology 2018 06 30;519:131-144. Epub 2018 Apr 30.
Department of Pathology, University of Massachusetts Medical School, 368 Plantation Street, ASC9-2014E, Worcester, MA 01605, USA. Electronic address:
Natural killer (NK) cells control antiviral adaptive immune responses in mice during some virus infections, but the universality of this phenomenon remains unknown. Lymphocytic choriomeningitis virus (LCMV) infection of mice triggered potent cytotoxic activity of NK cells (NK) against activated CD4 T cells, tumor cells, and allogeneic lymphocytes. In contrast, NK cells activated by vaccinia virus (VACV) infection (NK) exhibited weaker cytolytic activity against each of these target cells. Read More
Int J Cancer 2018 Apr 26. Epub 2018 Apr 26.
Division of Virology, Medical University of Innsbruck, Innsbruck, Austria.
Oncolytic viruses, including the oncolytic rhabdovirus VSV-GP tested here, selectively infect and kill cancer cells and are a promising new therapeutic modality. Our aim was to study the efficacy of VSV-GP, a vesicular stomatitis virus carrying the glycoprotein of lymphocytic choriomeningitis virus, against prostate cancer, for which current treatment options still fail to cure metastatic disease. VSV-GP was found to infect 6 of 7 prostate cancer cell lines with great efficacy. Read More
J Immunol 2018 Jun 25;200(11):3769-3776. Epub 2018 Apr 25.
Centre International de Recherche en Infectiologie, Lyon 69007, France;
Hemophagocytic lymphohistiocytosis (HLH) is a severe inflammatory condition that occurs in patients with genetic defects of cytotoxicity (familial HLH [FHL]) or secondary to other immunological disorders such as juvenile idiopathic arthritis. HLH is characterized by elevated levels of serum IL-18 and other cytokines. Moreover, a novel clinical entity has been recently identified in which constitutive NLRC4 inflammasome activation leads to severe HLH. Read More
Eur J Immunol 2018 Aug 30;48(8):1389-1399. Epub 2018 May 30.
Division of Immunology Transplantation and Infectious Diseases (DITID), Diabetes Research Institute (DRI) IRCCS San Raffaele Scientific Institute, Milan, Italy.
Tr1 cell therapy is considered an emerging approach to improve transplant tolerance and enhance allogeneic graft survival. However, it remains unclear how Tr1 cells promote transplant tolerance and whether they will be safe and stable in the face of an acute viral infection. By employing a mouse model of pancreatic islet transplantation, we report that Tr1 cell therapy promoted transplant tolerance via de novo induction of Tr1 cells in the recipients. Read More
PLoS Pathog 2018 04 19;14(4):e1006985. Epub 2018 Apr 19.
Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States of America.
Regulatory T cells (Tregs) play a cardinal role in the immune system by suppressing detrimental autoimmune responses, but their role in acute, chronic infectious diseases and tumor microenvironment remains unclear. We recently demonstrated that IFN-α/β receptor (IFNAR) signaling promotes Treg function in autoimmunity. Here we dissected the functional role of IFNAR-signaling in Tregs using Treg-specific IFNAR deficient (IFNARfl/flxFoxp3YFP-Cre) mice in acute LCMV Armstrong, chronic Clone-13 viral infection, and in tumor models. Read More
MBio 2018 Apr 17;9(2). Epub 2018 Apr 17.
Center for Infection and Immunity, Columbia University, New York, New York, USA
The microbiome of wild (house mouse), a globally distributed invasive pest that resides in close contact with humans in urban centers, is largely unexplored. Here, we report analysis of the fecal virome of house mice in residential buildings in New York City, NY. Mice were collected at seven sites in Manhattan, Queens, Brooklyn, and the Bronx over a period of 1 year. Read More
J Exp Med 2018 May 17;215(5):1493-1504. Epub 2018 Apr 17.
Oncode Institute and Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, Netherlands
Adaptive immunity is initiated by T cell recognition of specific antigens presented by major histocompatibility complexes (MHCs). MHC multimer technology has been developed for the detection, isolation, and characterization of T cells in infection, autoimmunity, and cancer. Here, we present a simple, fast, flexible, and efficient method to generate many different MHC class I (MHC I) multimers in parallel using temperature-mediated peptide exchange. Read More
PLoS Negl Trop Dis 2018 04 16;12(4):e0006398. Epub 2018 Apr 16.
Department of virology I, National Institute of Infectious Diseases, Toyama, Shinjuku-ku, Tokyo, Japan.
Background: Lymphocytic choriomeningitis virus (LCMV) causes a variety of diseases, including asymptomatic infections, meningitis, and congenital infections in the fetus of infected mother. The development of a safe and effective vaccine against LCMV is imperative. This study aims to develop a new candidate vaccine against LCMV using a recombinant replication-incompetent rabies virus (RV) vector. Read More
Proc Natl Acad Sci U S A 2018 05 13;115(18):4749-4754. Epub 2018 Apr 13.
Emory Vaccine Center, Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA 30322;
PD-1 (programmed cell death-1) is the central inhibitory receptor regulating CD8 T cell exhaustion during chronic viral infection and cancer. Interestingly, PD-1 is also expressed transiently by activated CD8 T cells during acute viral infection, but the role of PD-1 in modulating T cell effector differentiation and function is not well defined. To address this question, we examined the expression kinetics and role of PD-1 during acute lymphocytic choriomeningitis virus (LCMV) infection of mice. Read More
J Virol 2018 06 29;92(12). Epub 2018 May 29.
Department of Medicine, Division of Immunobiology, University of Vermont, Burlington, Vermont, USA
Lymphocytic choriomeningitis mammarenavirus (LCMV) is an enveloped, negative-strand RNA virus that causes serious disease in humans but establishes an asymptomatic, lifelong infection in reservoir rodents. Different models have been proposed to describe how arenaviruses regulate the replication and transcription of their bisegmented, single-stranded RNA genomes, particularly during persistent infection. However, these models were based largely on viral RNA profiling data derived from entire populations of cells. Read More
Proc Natl Acad Sci U S A 2018 04 9;115(17):4357-4362. Epub 2018 Apr 9.
Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University School of Medicine, Atlanta, GA 30332;
The ability to analyze and isolate cells based on the expression of specific surface markers has increased our understanding of cell biology and produced numerous applications for biomedicine. However, established cell-sorting platforms rely on labels that are limited in number due to biophysical constraints, such as overlapping emission spectra of fluorophores in FACS. Here, we establish a framework built on a system of orthogonal and extensible DNA gates for multiplexed cell sorting. Read More
AIDS Res Hum Retroviruses 2018 May 18;34(5):430-438. Epub 2018 Apr 18.
Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University , Chicago, Illinois.
Bone marrow transplantation is a treatment for various cancers and genetic diseases, and the only case of a cured HIV infection involved the use of this clinical procedure, highlighting the potential use of this therapy for curing many chronic diseases. However, little is known about how chronic viral infection influences lymphocyte reconstitution after bone marrow transplantation. To address this, we infected mice with chronic lymphocytic choriomeningitis virus, and performed bone marrow transplantation to assess lymphocyte reconstitution. Read More
Cytokine 2018 Aug 27;108:105-114. Epub 2018 Mar 27.
Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Canada. Electronic address:
Dendritic cells produce IL-12 and IL-23 in response to viral and bacterial infection and these cytokines are responsible for successful pathogen clearance. How sequential viral and bacterial infections affect the production of IL-12 and IL-23 is currently not known. Our study demonstrates that in dendritic cells infected with Lymphocytic choriomeningitis virus (LCMV), TLR activation with bacterial PAMPs resulted in reduced IL-12 and IL-23 expression compared to non-infected cells. Read More
J Virol 2018 06 29;92(12). Epub 2018 May 29.
Molecular Biology Section, Division of Biological Sciences, University of California San Diego, La Jolla, California, USA
Chronic viral infections represent a major challenge to the host immune response, and a unique network of immunological elements, including cytokines, are required for their containment. By using a model persistent infection with the natural murine pathogen lymphocytic choriomeningitis virus clone 13 (LCMV Cl13) we investigated the role of one such cytokine, interleukin-27 (IL-27), in the control of chronic infection. We found that IL-27 receptor (IL-27R) signaling promoted control of LCMV Cl13 as early as days 1 and 5 after infection and that transcripts were rapidly elevated in multiple subsets of dendritic cells (DCs) and myeloid cells. Read More
J Virol 2018 06 14;92(11). Epub 2018 May 14.
Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, USA
Mammarenaviruses cause chronic infections in their natural rodent hosts. Infected rodents shed infectious virus into excreta. Humans are infected through mucosal exposure to aerosols or direct contact of abraded skin with fomites, resulting in a wide range of manifestations from asymptomatic or mild febrile illness to severe life-threatening hemorrhagic fever. Read More
Oncotarget 2018 Feb 2;9(16):12879-12893. Epub 2018 Feb 2.
Institute of Virology, Biomedical Research Center, Slovak Academy of Sciences, Bratislava 845 05, Slovak Republic.
Renal cell carcinoma is one of the most frequent cancer diseases with high resistance to radio- and chemotherapy. Mutation of VHL gene is frequent in these tumors leading to simulation of hypoxic conditions. Lymphocytic choriomeningitis virus, belonging to RNA viruses, is a neglected human pathogen and teratogen. Read More
J Virol 2018 06 14;92(11). Epub 2018 May 14.
Center for Virology and Vaccine Research, Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
Natural killer (NK) cells respond rapidly as a first line of defense against infectious pathogens. In addition, NK cells may provide a "rheostat" function and have been shown to reduce the magnitude of antigen-specific T cell responses following infection to avoid immunopathology. However, it remains unknown whether NK cells similarly modulate vaccine-elicited T cell responses following virus challenge. Read More
Immunity 2018 02;48(2):327-338.e5
Department of Microbiology and Immunology, University of Minnesota, Minneapolis, MN 55455, USA; Center for Immunology, University of Minnesota, Minneapolis, MN 55455, USA. Electronic address:
Immunosurveillance of secondary lymphoid organs (SLO) is performed by central memory T cells that recirculate through blood. Resident memory T (Trm) cells remain parked in nonlymphoid tissues and often stably express CD69. We recently identified Trm cells within SLO, but the origin and phenotype of these cells remains unclear. Read More
Proc Natl Acad Sci U S A 2018 03 20;115(10):2455-2460. Epub 2018 Feb 20.
Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15261;
Tim-3 is highly expressed on a subset of T cells during T cell exhaustion in settings of chronic viral infection and tumors. Using lymphocytic choriomeningitis virus (LCMV) Clone 13, a model for chronic infection, we found that Tim-3 was neither necessary nor sufficient for the development of T cell exhaustion. Nonetheless, expression of Tim-3 was sufficient to drive resistance to PD-L1 blockade therapy during chronic infection. Read More
PLoS Pathog 2018 02 20;14(2):e1006892. Epub 2018 Feb 20.
Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California, United States of America.
Several mammalian arenaviruses (mammarenaviruses) cause hemorrhagic fevers in humans and pose serious public health concerns in their endemic regions. Additionally, mounting evidence indicates that the worldwide-distributed, prototypic mammarenavirus, lymphocytic choriomeningitis virus (LCMV), is a neglected human pathogen of clinical significance. Concerns about human-pathogenic mammarenaviruses are exacerbated by of the lack of licensed vaccines, and current anti-mammarenavirus therapy is limited to off-label use of ribavirin that is only partially effective. Read More
Mucosal Immunol 2018 Jul 19;11(4):1158-1167. Epub 2018 Feb 19.
Virology and Immunology, Gladstone Institutes, San Francisco, CA, 94158, USA.
Determining the magnitude of local immune response during mucosal exposure to viral pathogens is critical to understanding the mechanism of viral pathogenesis. We previously showed that vaginal inoculation of lymphocytic choriomeningitis virus (LCMV) fails to induce a robust innate immune response in the lower female reproductive tract (FRT), allowing high titer viral replication and a delay in T-cell-mediated viral control. Despite this immunological delay, LCMV replication remained confined mainly to the FRT and the draining iliac lymph node. Read More
Virology 2018 05 16;518:34-44. Epub 2018 Feb 16.
Unité de virologie, Département de Biologie des Agents Transmissibles, Institut de Recherche Biomédicale des Armées, 1 place général Valérie André, BP 73 91 223 Brétigny-sur-Orge cedex, France. Electronic address:
Mammarenaviruses bud out of infected cells via the recruitment of the endosomal sorting complex required for transport through late domain motifs localized into their Z protein. Here, we demonstrated that mammarenaviruses lacking this protein can be rescued and are replicative, despite a 3-log reduction in virion production, in BHK-21 cells, but not in five other cell lines. Mutations of putative late domain motifs identified into the viral nucleoprotein resulted in the almost complete abolition of infectious virion production by Z-deleted mammarenaviruses. Read More
J Exp Med 2018 Mar 12;215(3):773-783. Epub 2018 Feb 12.
Department of Biological Sciences, University of California, San Diego, La Jolla, CA
CD8 T cells responding to infection differentiate into a heterogeneous population composed of progeny that are short-lived and participate in the immediate, acute response and those that provide long-lasting host protection. Although it is appreciated that distinct functional and phenotypic CD8 T cell subsets persist, it is unclear whether there is plasticity among subsets and what mechanisms maintain subset-specific differences. Here, we show that continued Id2 regulation of E-protein activity is required to maintain the KLRG1 CD8 T cell population after lymphocytic choriomeningitis virus infection. Read More
Viruses 2018 02 10;10(2). Epub 2018 Feb 10.
Center for Predictive Medicine for Biodefense and Emerging Infectious Diseases, Louisville, KY 40202, USA.
Mammarenavirusesare single-stranded RNA viruses with a bisegmented ambisense genome. Ingestion has been shown as a natural route of transmission for both Lassa virus (LASV) and Lymphocytic choriomeningitis virus (LCMV). Due to the mechanism of transmission, epithelial tissues are among the first host cells to come in contact with the viruses, and as such they potentially play a role in spread of virus to naïve hosts. Read More
Pathogens 2018 Feb 13;7(1). Epub 2018 Feb 13.
Department of Pathology, University of Utah, Salt Lake City, UT 84112, USA.
While CD8⁺ memory T cells can promote long-lived protection from secondary exposure to intracellular pathogens, less is known regarding the direct protective mechanisms of CD4⁺ T cells. We utilized a prime/boost model in which mice are initially exposed to an acutely infecting strain of lymphocytic choriomeningitis virus (LCMV), followed by a heterologous rechallenge with recombinantly expressing the MHC Class II-restricted LCMV epitope, GP (Lm-gp61). We found that heterologous Lm-gp61 rechallenge resulted in robust activation of CD4⁺ memory T cells and that they were required for rapid bacterial clearance. Read More
J Immunol 2018 Mar 7;200(6):2004-2012. Epub 2018 Feb 7.
Department of Microbiology and Immunology, Center for Immunology, University of Minnesota Medical School, Minneapolis, MN 55455
CD4 Th cells can have cytotoxic activity against cells displaying relevant peptide-MHC class II (p:MHCII) ligands. Cytotoxicity may be a property of Th1 cells and depends on perforin and the Eomes transcription factor. We assessed these assertions for polyclonal p:MHCII-specific CD4 T cells activated in vivo in different contexts. Read More
ACS Infect Dis 2018 May 1;4(5):815-824. Epub 2018 Mar 1.
Several arenaviruses cause hemorrhagic fever (HF) disease in humans and represent important public health problems in their endemic regions. In addition, evidence indicates that the worldwide-distributed prototypic arenavirus lymphocytic choriomeningitis virus is a neglected human pathogen of clinical significance. There are no licensed arenavirus vaccines, and current antiarenavirus therapy is limited to an off-label use of ribavirin that is only partially effective. Read More
Cell Mol Immunol 2018 Feb 5. Epub 2018 Feb 5.
Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX 77555-1070, USA.
Viral hepatitis is still a public health problem affecting several million people around the world. Neutrophils are polymorphonuclear cells that have a critical role in antibacterial infection. However, the role of neutrophils in viral infection is not fully understood. Read More