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macrophages

  • Open Access
    A Porcine <em>Ex Vivo</em> Lung Perfusion Model To Investigate Bacterial Pathogenesis
    Research Article | Host-Microbe Biology
    A Porcine Ex Vivo Lung Perfusion Model To Investigate Bacterial Pathogenesis

    The implementation of infection models that approximate human disease is essential to understand infections and for testing new therapies before they enter into clinical stages. Rodents are used in most preclinical studies, although the differences between mice and humans have fueled the conclusion that murine studies are unreliable predictors of human outcomes. In this study, we have developed a whole-lung porcine model of infection...

    Amy Dumigan, Marianne Fitzgerald, Joana Sá-Pessoa Graca Santos, Umar Hamid, Cecilia M. O’Kane, Danny F. McAuley, Jose A. Bengoechea
  • Open Access
    IRG1 and Inducible Nitric Oxide Synthase Act Redundantly with Other Interferon-Gamma-Induced Factors To Restrict Intracellular Replication of <span class="named-content genus-species" id="named-content-1">Legionella pneumophila</span>
    Research Article | Host-Microbe Biology
    IRG1 and Inducible Nitric Oxide Synthase Act Redundantly with Other Interferon-Gamma-Induced Factors To Restrict Intracellular Replication of Legionella pneumophila

    Legionella pneumophila is one example among many species of pathogenic bacteria that replicate within mammalian macrophages during infection. The immune signaling factor interferon gamma (IFN-γ) blocks L. pneumophila replication in macrophages and is an essential component of the immune response to...

    Jordan V. Price, Daniel Russo, Daisy X. Ji, Roberto A. Chavez, Lucian DiPeso, Angus Yiu-Fai Lee, Jörn Coers, Russell E. Vance
  • Open Access
    TREM-1 Protects HIV-1-Infected Macrophages from Apoptosis through Maintenance of Mitochondrial Function
    Research Article | Molecular Biology and Physiology
    TREM-1 Protects HIV-1-Infected Macrophages from Apoptosis through Maintenance of Mitochondrial Function

    The major challenge to human immunodeficiency virus (HIV) treatment is the development of strategies that lead to viral eradication. A roadblock to accomplishing this goal is the lack of an approach that would safely eliminate HIV from all resting/latent reservoirs, including macrophages. Macrophages are a key part of the innate immune system and are responsible for recognizing invading microbes and sending appropriate signals to other...

    Grant R. Campbell, Rachel K. To, Stephen A. Spector
  • Open Access
    Bacterial Pathogens Hijack the Innate Immune Response by Activation of the Reverse Transsulfuration Pathway
    Research Article | Host-Microbe Biology
    Bacterial Pathogens Hijack the Innate Immune Response by Activation of the Reverse Transsulfuration Pathway

    Macrophages are professional immune cells that ingest and kill microbes. In this study, we show that different pathogenic bacteria induce the expression of cystathionine γ-lyase (CTH) in macrophages. This enzyme is involved in a metabolic pathway called the reverse transsulfuration pathway, which leads to the production of numerous metabolites, including cystathionine. Phagocytized bacteria use cystathionine to better survive in...

    Alain P. Gobert, Yvonne L. Latour, Mohammad Asim, Jordan L. Finley, Thomas G. Verriere, Daniel P. Barry, Ginger L. Milne, Paula B. Luis, Claus Schneider, Emilio S. Rivera, Kristie Lindsey-Rose, Kevin L. Schey, Alberto G. Delgado, Johanna C. Sierra, M. Blanca Piazuelo, Keith T. Wilson
  • Open Access
    A Genome-Wide Knockout Screen in Human Macrophages Identified Host Factors Modulating <em>Salmonella</em> Infection
    Research Article | Host-Microbe Biology
    A Genome-Wide Knockout Screen in Human Macrophages Identified Host Factors Modulating Salmonella Infection

    Salmonella exploits macrophages to gain access to the lymphatic system and bloodstream to lead to local and potentially systemic infections. With an increasing number of antibiotic-resistant isolates identified in humans, Salmonella infections have become major threats to public health. Therefore, there is an urgent need to identify alternative approaches to anti-infective therapy, including host-directed therapies. In...

    Amy T. Y. Yeung, Yoon Ha Choi, Amy H. Y. Lee, Christine Hale, Hannes Ponstingl, Derek Pickard, David Goulding, Mark Thomas, Erin Gill, Jong Kyoung Kim, Allan Bradley, Robert E. W. Hancock, Gordon Dougan
  • Open Access
    Myeloid and CD4 T Cells Comprise the Latent Reservoir in Antiretroviral Therapy-Suppressed SIVmac251-Infected Macaques
    Research Article | Clinical Science and Epidemiology
    Myeloid and CD4 T Cells Comprise the Latent Reservoir in Antiretroviral Therapy-Suppressed SIVmac251-Infected Macaques

    This study provides further evidence that the latent reservoir is comprised of both CD4+ T cells and myeloid cells. The data presented here suggest that CD4+ T cells and macrophages found throughout tissues in the body can contain replication-competent SIV and contribute to rebound of the virus after treatment interruption. Additionally, we have shown that monocytes in blood contain latent virus and, though not...

    Celina M. Abreu, Rebecca T. Veenhuis, Claudia R. Avalos, Shelby Graham, Daymond R. Parrilla, Edna A. Ferreira, Suzanne E. Queen, Erin N. Shirk, Brandon T. Bullock, Ming Li, Kelly A. Metcalf Pate, Sarah E. Beck, Lisa M. Mangus, Joseph L. Mankowski, Feilim Mac Gabhann, Shelby L. O’Connor, Lucio Gama, Janice E. Clements
  • Open Access
    Barcoded Consortium Infections Resolve Cell Type-Dependent <span class="named-content genus-species" id="named-content-1">Salmonella enterica</span> Serovar Typhimurium Entry Mechanisms
    Research Article | Host-Microbe Biology
    Barcoded Consortium Infections Resolve Cell Type-Dependent Salmonella enterica Serovar Typhimurium Entry Mechanisms

    Salmonella enterica serovar Typhimurium (S.Tm) is a widespread and broad-host-spectrum enteropathogen with the capacity to invade diverse cell types. Still, the molecular basis for the host cell invasion process has largely been inferred from studies of a few selected cell lines. Our work resolves the mechanisms that Salmonellae employ to invade...

    Maria Letizia Di Martino, Viktor Ek, Wolf-Dietrich Hardt, Jens Eriksson, Mikael E. Sellin
  • Open Access
    <em>Helicobacter pylori</em> VacA Targets Myeloid Cells in the Gastric Lamina Propria To Promote Peripherally Induced Regulatory T-Cell Differentiation and Persistent Infection
    Research Article | Host-Microbe Biology
    Helicobacter pylori VacA Targets Myeloid Cells in the Gastric Lamina Propria To Promote Peripherally Induced Regulatory T-Cell Differentiation and Persistent Infection

    Helicobacter pylori has coexisted with humans for at least 60.000 years and has evolved persistence strategies that allow it to evade host immunity and colonize its host for life. The VacA protein is expressed by all H. pylori strains and is required for high-level persistent infection in...

    Aleksandra Altobelli, Michael Bauer, Karelia Velez, Timothy L. Cover, Anne Müller
  • Open Access
    Three <em>Toxoplasma gondii</em> Dense Granule Proteins Are Required for Induction of Lewis Rat Macrophage Pyroptosis
    Research Article | Host-Microbe Biology
    Three Toxoplasma gondii Dense Granule Proteins Are Required for Induction of Lewis Rat Macrophage Pyroptosis

    Inflammasomes are major components of the innate immune system and are responsible for detecting various microbial and environmental danger signals. Upon invasion of Lewis rat macrophages, the parasite rapidly activates the NLRP1 inflammasome, resulting in pyroptosis and elimination of the parasite’s replication niche. The work reported here revealed that Toxoplasma GRA35, GRA42, and GRA43 are required for induction of Lewis...

    Yifan Wang, Kimberly M. Cirelli, Patricio D. C. Barros, Lamba Omar Sangaré, Vincent Butty, Musa A. Hassan, Patricia Pesavento, Asli Mete, Jeroen P. J. Saeij
  • Open Access
    <span class="named-content genus-species" id="named-content-1">Streptococcus agalactiae</span> Induces Placental Macrophages To Release Extracellular Traps Loaded with Tissue Remodeling Enzymes via an Oxidative Burst-Dependent Mechanism
    Research Article | Host-Microbe Biology
    Streptococcus agalactiae Induces Placental Macrophages To Release Extracellular Traps Loaded with Tissue Remodeling Enzymes via an Oxidative Burst-Dependent Mechanism

    Streptococcus agalactiae, also known as group B Streptococcus (GBS), is a common pathogen during pregnancy where infection can result in chorioamnionitis, preterm premature rupture of membranes (PPROM), preterm labor, stillbirth, and neonatal sepsis. Mechanisms by which GBS infection results in adverse pregnancy outcomes are still incompletely understood....

    Ryan S. Doster, Jessica A. Sutton, Lisa M. Rogers, David M. Aronoff, Jennifer A. Gaddy

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