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host-pathogen interactions

  • Open Access
    The Canonical Long-Chain Fatty Acid Sensing Machinery Processes Arachidonic Acid To Inhibit Virulence in Enterohemorrhagic <span class="named-content genus-species" id="named-content-1">Escherichia coli</span>
    Research Article | Host-Microbe Biology
    The Canonical Long-Chain Fatty Acid Sensing Machinery Processes Arachidonic Acid To Inhibit Virulence in Enterohemorrhagic Escherichia coli

    Polyunsaturated fatty acids (PUFAs) play important roles in host immunity. Manipulation of lipid content in host tissues through diet or pharmacological interventions is associated with altered severity of various inflammatory diseases.

    Melissa Ellermann, Angel G. Jimenez, Reed Pifer, Nestor Ruiz, Vanessa Sperandio
  • Open Access
    Intracellular Density of <em>Wolbachia</em> Is Mediated by Host Autophagy and the Bacterial Cytoplasmic Incompatibility Gene <em>cifB</em> in a Cell Type-Dependent Manner in <span class="named-content genus-species" id="named-content-1">Drosophila melanogaster</span>
    Research Article | Host-Microbe Biology
    Intracellular Density of Wolbachia Is Mediated by Host Autophagy and the Bacterial Cytoplasmic Incompatibility Gene cifB in a Cell Type-Dependent Manner in Drosophila melanogaster

    Autophagy is a eukaryotic intracellular degradation pathway which can act as an innate immune response to eliminate pathogens. Conversely, pathogens can evolve proteins which modulate the autophagy pathway to subvert degradation and establish an infection. Wolbachia, a vertically transmitted obligate endosymbiont which infects up to 40% of insect species, is negatively regulated by autophagy in whole animals, but the specific...

    Mark Deehan, Weiwei Lin, Benjamin Blum, Andrew Emili, Horacio Frydman
  • Open Access
    HIV-1 Vpr-Induced Proinflammatory Response and Apoptosis Are Mediated through the Sur1-Trpm4 Channel in Astrocytes
    Research Article | Host-Microbe Biology
    HIV-1 Vpr-Induced Proinflammatory Response and Apoptosis Are Mediated through the Sur1-Trpm4 Channel in Astrocytes

    Effective antiretroviral therapies can now prolong patients’ lives to nearly normal life span. The current challenge faced by many HIV-infected patients is chronic neuroinflammation and neurotoxicity that contributes to HIV-associated neurocognitive disorders (HAND).

    Ge Li, Tapas Makar, Volodymyr Gerzanich, Sudhakar Kalakonda, Svetlana Ivanova, Edna F. R. Pereira, Sanketh Andharvarapu, Jiantao Zhang, J. Marc Simard, Richard Y. Zhao
  • Open Access
    Syndecan-1 Promotes <span class="named-content genus-species" id="named-content-1">Streptococcus pneumoniae</span> Corneal Infection by Facilitating the Assembly of Adhesive Fibronectin Fibrils
    Research Article | Host-Microbe Biology
    Syndecan-1 Promotes Streptococcus pneumoniae Corneal Infection by Facilitating the Assembly of Adhesive Fibronectin Fibrils

    Bacterial pathogens have evolved several ingenious mechanisms to subvert host cell biology for their pathogenesis. Bacterial attachment to the host ECM establishes a niche to grow and is considered one of the critical steps of infection. This pathogenic mechanism entails coordinated assembly of the ECM by the host to form the ECM structure and organization that are specifically recognized by bacteria for their adhesion. We...

    Akiko Jinno, Atsuko Hayashida, Howard F. Jenkinson, Pyong Woo Park
  • Open Access
    Gene Loss and Acquisition in Lineages of <span class="named-content genus-species" id="named-content-1">Pseudomonas aeruginosa</span> Evolving in Cystic Fibrosis Patient Airways
    Research Article | Host-Microbe Biology
    Gene Loss and Acquisition in Lineages of Pseudomonas aeruginosa Evolving in Cystic Fibrosis Patient Airways

    Bacterial airway infections, predominantly caused by P. aeruginosa, are a major cause of mortality and morbidity of CF patients. While short insertions and deletions as well as point mutations occurring during infection are well studied, there is a lack of understanding of how gene loss and acquisition play roles in bacterial adaptation to the human airways. Here, we...

    Migle Gabrielaite, Helle K. Johansen, Søren Molin, Finn C. Nielsen, Rasmus L. Marvig
  • Open Access
    Survival Strategies of Pathogenic <em>Candida</em> Species in Human Blood Show Independent and Specific Adaptations
    Research Article | Host-Microbe Biology
    Survival Strategies of Pathogenic Candida Species in Human Blood Show Independent and Specific Adaptations

    To ensure their survival, pathogens have to adapt immediately to new environments in their hosts, for example, during the transition from the gut to the bloodstream. Here, we investigated the basis of this adaptation in a group of fungal species which are among the most common causes of hospital-acquired infections, the Candida species. On the basis of a human whole-blood infection model, we studied which genes and processes...

    Philipp Kämmer, Sylvie McNamara, Thomas Wolf, Theresia Conrad, Stefanie Allert, Franziska Gerwien, Kerstin Hünniger, Oliver Kurzai, Reinhard Guthke, Bernhard Hube, Jörg Linde, Sascha Brunke
  • Open Access
    Molecular Mimicry: a Paradigm of Host-Microbe Coevolution Illustrated by <em>Legionella</em>
    Minireview | Host-Microbe Biology
    Molecular Mimicry: a Paradigm of Host-Microbe Coevolution Illustrated by Legionella

    Through coevolution with host cells, microorganisms have acquired mechanisms to avoid the detection by the host surveillance system and to use the cell’s supplies to establish themselves. Indeed, certain pathogens have evolved proteins that imitate specific eukaryotic cell proteins, allowing them to manipulate host pathways, a phenomenon termed molecular mimicry. Bacterial “eukaryotic-like proteins” are a remarkable example of molecular...

    Sonia Mondino, Silke Schmidt, Carmen Buchrieser
  • Open Access
    HIV Vpr Modulates the Host DNA Damage Response at Two Independent Steps to Damage DNA and Repress Double-Strand DNA Break Repair
    Research Article | Host-Microbe Biology
    HIV Vpr Modulates the Host DNA Damage Response at Two Independent Steps to Damage DNA and Repress Double-Strand DNA Break Repair

    The DNA damage response (DDR) is a signaling cascade that safeguards the genome from genotoxic agents, including human pathogens. However, the DDR has also been utilized by many pathogens, such as human immunodeficiency virus (HIV), to enhance infection. To properly treat HIV-positive individuals, we must understand how the virus usurps our own cellular processes. Here, we have found that an important yet poorly understood gene in HIV,...

    Donna Li, Andrew Lopez, Carina Sandoval, Randilea Nichols Doyle, Oliver I. Fregoso
  • Open Access
    Structural Basis and Evolution of Glycan Receptor Specificities within the Polyomavirus Family
    Research Article | Host-Microbe Biology
    Structural Basis and Evolution of Glycan Receptor Specificities within the Polyomavirus Family

    Virus attachment to cell surface receptors is critical for productive infection. In this study, we have used a structure-based approach to investigate the cell surface recognition event for New Jersey polyomavirus (NJPyV) and human polyomavirus 12 (HPyV12). These viruses belong to the polyomavirus family, whose members target different tissues and hosts, including mammals, birds, fish, and invertebrates. Polyomaviruses are nonenveloped...

    Luisa J. Ströh, Nils H. Rustmeier, Bärbel S. Blaum, Josephine Botsch, Philip Rößler, Florian Wedekink, W. Ian Lipkin, Nischay Mishra, Thilo Stehle
  • Open Access
    <span class="named-content genus-species" id="named-content-1">Toxoplasma gondii</span> Co-opts the Unfolded Protein Response To Enhance Migration and Dissemination of Infected Host Cells
    Research Article | Host-Microbe Biology
    Toxoplasma gondii Co-opts the Unfolded Protein Response To Enhance Migration and Dissemination of Infected Host Cells

    Cells that are infected with the parasite Toxoplasma gondii exhibit heightened migratory activity, which facilitates dissemination of the infection throughout the body. In this report, we identify a new mechanism used by Toxoplasma to hijack its host cell and increase its mobility. We further show that the ability of Toxoplasma to increase host cell...

    Leonardo Augusto, Jennifer Martynowicz, Parth H. Amin, Nada S. Alakhras, Mark H. Kaplan, Ronald C. Wek, William J. Sullivan

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