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  1. Article ; Online: Scratching the Surface Takes a Toll: Immune Recognition of Viral Proteins by Surface Toll-like Receptors.

    Hatton, Alexis A / Guerra, Fermin E

    Viruses

    2022  Volume 15, Issue 1

    Abstract: Early innate viral recognition by the host is critical for the rapid response and subsequent clearance of an infection. Innate immune cells patrol sites of infection to detect and respond to invading microorganisms including viruses. Surface Toll-like ... ...

    Abstract Early innate viral recognition by the host is critical for the rapid response and subsequent clearance of an infection. Innate immune cells patrol sites of infection to detect and respond to invading microorganisms including viruses. Surface Toll-like receptors (TLRs) are a group of pattern recognition receptors (PRRs) that can be activated by viruses even before the host cell becomes infected. However, the early activation of surface TLRs by viruses can lead to viral clearance by the host or promote pathogenesis. Thus, a plethora of research has attempted to identify specific viral ligands that bind to surface TLRs and mediate progression of viral infection. Herein, we will discuss the past two decades of research that have identified specific viral proteins recognized by cell surface-associated TLRs, how these viral proteins and host surface TLR interactions affect the host inflammatory response and outcome of infection, and address why controversy remains regarding host surface TLR recognition of viral proteins.
    MeSH term(s) Viral Proteins ; Signal Transduction ; Toll-Like Receptors ; Viruses ; Receptors, Pattern Recognition ; Immunity, Innate
    Chemical Substances Viral Proteins ; Toll-Like Receptors ; Receptors, Pattern Recognition
    Language English
    Publishing date 2022-12-24
    Publishing country Switzerland
    Document type Journal Article ; Review ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2516098-9
    ISSN 1999-4915 ; 1999-4915
    ISSN (online) 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v15010052
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Nuclear factor kappa B-dependent persistence of

    Stepien, Taylor A / Singletary, Larissa A / Guerra, Fermin E / Karlinsey, Joyce E / Libby, Stephen J / Jaslow, Sarah L / Gaggioli, Margaret R / Gibbs, Kyle D / Ko, Dennis C / Brehm, Michael A / Greiner, Dale L / Shultz, Leonard D / Fang, Ferric C

    mBio

    2024  Volume 15, Issue 4, Page(s) e0045424

    Abstract: Salmonella: Importance: Salmonella enterica is a common cause of gastrointestinal infections worldwide. The ... ...

    Abstract Salmonella
    Importance: Salmonella enterica is a common cause of gastrointestinal infections worldwide. The serovars
    MeSH term(s) Humans ; Animals ; Mice ; Salmonella typhi/genetics ; Typhoid Fever/microbiology ; NF-kappa B ; Macrophages/microbiology ; Salmonella
    Chemical Substances NF-kappa B
    Language English
    Publishing date 2024-03-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2557172-2
    ISSN 2150-7511 ; 2161-2129
    ISSN (online) 2150-7511
    ISSN 2161-2129
    DOI 10.1128/mbio.00454-24
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: The Accessory Gene

    Collins, Madison M / Behera, Ranjan K / Pallister, Kyler B / Evans, Tyler J / Burroughs, Owen / Flack, Caralyn / Guerra, Fermin E / Pullman, Willis / Cone, Brock / Dankoff, Jennifer G / Nygaard, Tyler K / Brinsmade, Shaun R / Voyich, Jovanka M

    Frontiers in microbiology

    2020  Volume 11, Page(s) 561

    Abstract: Staphylococcus ... ...

    Abstract Staphylococcus aureus
    Language English
    Publishing date 2020-04-22
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2020.00561
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Quantifying the Cytotoxicity of Staphyloccus aureus Against Human Polymorphonuclear Leukocytes.

    Dankoff, Jennifer G / Pallister, Kyler B / Guerra, Fermin E / Parks, Alexander J / Gorham, Kelly / Mastandrea, Saul / Voyich, Jovanka M / Nygaard, Tyler K

    Journal of visualized experiments : JoVE

    2020  , Issue 155

    Abstract: Staphylococcus aureus is capable of secreting a wide range of leukocidins that target and disrupt the membrane integrity of polymorphonuclear leukocytes (PMNs or neutrophils). This protocol describes both the purification of human PMNs and the ... ...

    Abstract Staphylococcus aureus is capable of secreting a wide range of leukocidins that target and disrupt the membrane integrity of polymorphonuclear leukocytes (PMNs or neutrophils). This protocol describes both the purification of human PMNs and the quantification of S. aureus cytotoxicity against PMNs in three different sections. Section 1 details the isolation of PMNs and serum from human blood using density centrifugation. Section 2 tests the cytotoxicity of extracellular proteins produced by S. aureus against these purified human PMNs. Section 3 measures the cytotoxicity against human PMNs following the phagocytosis of live S. aureus. These procedures measure disruption of PMN plasma membrane integrity by S. aureus leukocidins using flow cytometry analysis of PMNs treated with propidium iodide, a DNA binding fluorophore that is cell membrane impermeable. Collectively, these methods have the advantage of rapidly testing S. aureus cytotoxicity against primary human PMNs and can be easily adapted to study other aspects of host-pathogen interactions.
    MeSH term(s) Bacterial Proteins/metabolism ; Cell Death ; Cell Separation ; Flow Cytometry ; Humans ; Neutrophils/cytology ; Neutrophils/microbiology ; Phagocytosis ; Propidium/metabolism ; Staphylococcus aureus/physiology
    Chemical Substances Bacterial Proteins ; Propidium (36015-30-2)
    Language English
    Publishing date 2020-01-03
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Video-Audio Media
    ZDB-ID 2259946-0
    ISSN 1940-087X ; 1940-087X
    ISSN (online) 1940-087X
    ISSN 1940-087X
    DOI 10.3791/60681
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Epic Immune Battles of History: Neutrophils vs.

    Guerra, Fermin E / Borgogna, Timothy R / Patel, Delisha M / Sward, Eli W / Voyich, Jovanka M

    Frontiers in cellular and infection microbiology

    2017  Volume 7, Page(s) 286

    Abstract: Neutrophils are the most abundant leukocytes in human blood and the first line of defense after bacteria have breached the epithelial barriers. After migration to a site of infection, neutrophils engage and expose invading microorganisms to antimicrobial ...

    Abstract Neutrophils are the most abundant leukocytes in human blood and the first line of defense after bacteria have breached the epithelial barriers. After migration to a site of infection, neutrophils engage and expose invading microorganisms to antimicrobial peptides and proteins, as well as reactive oxygen species, as part of their bactericidal arsenal. Ideally, neutrophils ingest bacteria to prevent damage to surrounding cells and tissues, kill invading microorganisms with antimicrobial mechanisms, undergo programmed cell death to minimize inflammation, and are cleared away by macrophages.
    Language English
    Publishing date 2017
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2619676-1
    ISSN 2235-2988 ; 2235-2988
    ISSN (online) 2235-2988
    ISSN 2235-2988
    DOI 10.3389/fcimb.2017.00286
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Aspartic Acid Residue 51 of SaeR Is Essential for

    Nygaard, Tyler K / Borgogna, Timothy R / Sward, Eli W / Guerra, Fermin E / Dankoff, Jennifer G / Collins, Madison M / Pallister, Kyler B / Chen, Liang / Kreiswirth, Barry N / Voyich, Jovanka M

    Frontiers in microbiology

    2018  Volume 9, Page(s) 3085

    Abstract: Staphylococcus ... ...

    Abstract Staphylococcus aureus
    Language English
    Publishing date 2018-12-14
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2587354-4
    ISSN 1664-302X
    ISSN 1664-302X
    DOI 10.3389/fmicb.2018.03085
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Quantifying the cytotoxicity of Staphyloccus aureus against human polymorphonuclear leukocytes

    Dankoff, Jennifer G / Pallister, Kyler B / Guerra, Fermin E / Parks, Alexander J / Gorham, Kelly / Mastandrea, Saul / Voyich, Jovanka M / Nygaard, Tyler K

    Journal of visualized experiments. 2020 Jan. 03, , no. 155

    2020  

    Abstract: Staphylococcus aureus is capable of secreting a wide range of leukocidins that target and disrupt the membrane integrity of polymorphonuclear leukocytes (PMNs or neutrophils). This protocol describes both the purification of human PMNs and the ... ...

    Abstract Staphylococcus aureus is capable of secreting a wide range of leukocidins that target and disrupt the membrane integrity of polymorphonuclear leukocytes (PMNs or neutrophils). This protocol describes both the purification of human PMNs and the quantification of S. aureus cytotoxicity against PMNs in three different sections. Section 1 details the isolation of PMNs and serum from human blood using density centrifugation. Section 2 tests the cytotoxicity of extracellular proteins produced by S. aureus against these purified human PMNs. Section 3 measures the cytotoxicity against human PMNs following the phagocytosis of live S. aureus. These procedures measure disruption of PMN plasma membrane integrity by S. aureus leukocidins using flow cytometry analysis of PMNs treated with propidium iodide, a DNA binding fluorophore that is cell membrane impermeable. Collectively, these methods have the advantage of rapidly testing S. aureus cytotoxicity against primary human PMNs and can be easily adapted to study other aspects of host-pathogen interactions.
    Keywords DNA ; Staphylococcus aureus ; blood serum ; centrifugation ; cytotoxicity ; flow cytometry ; fluorescent dyes ; host-pathogen relationships ; humans ; neutrophils ; phagocytosis ; plasma membrane ; propidium ; proteins
    Language English
    Dates of publication 2020-0103
    Size p. e60681.
    Publishing place Journal of Visualized Experiments
    Document type Article
    ZDB-ID 2259946-0
    ISSN 1940-087X
    ISSN 1940-087X
    DOI 10.3791/60681
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Increased Pilus Production Conferred by a Naturally Occurring Mutation Alters Host-Pathogen Interaction in Favor of Carriage in Streptococcus pyogenes.

    Flores, Anthony R / Olsen, Randall J / Cantu, Concepcion / Pallister, Kyler B / Guerra, Fermin E / Voyich, Jovanka M / Musser, James M

    Infection and immunity

    2017  Volume 85, Issue 5

    Abstract: Studies of the human pathogen group ... ...

    Abstract Studies of the human pathogen group A
    MeSH term(s) Animals ; Bacterial Adhesion ; Carrier State/microbiology ; Cells, Cultured ; Epithelial Cells/microbiology ; Female ; Fimbriae, Bacterial/genetics ; Gene Expression Profiling ; Histidine Kinase/genetics ; Host-Pathogen Interactions ; Humans ; Mice ; Microbial Viability ; Mutation, Missense ; Nasopharynx/microbiology ; Neutrophils/immunology ; Neutrophils/microbiology ; Organelle Biogenesis ; Streptococcal Infections/microbiology ; Streptococcus pyogenes/pathogenicity ; Streptococcus pyogenes/physiology ; Transcription, Genetic
    Chemical Substances Histidine Kinase (EC 2.7.13.1)
    Language English
    Publishing date 2017-05
    Publishing country United States
    Document type Journal Article
    ZDB-ID 218698-6
    ISSN 1098-5522 ; 0019-9567
    ISSN (online) 1098-5522
    ISSN 0019-9567
    DOI 10.1128/IAI.00949-16
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Staphylococcus aureus SaeR/S-regulated factors reduce human neutrophil reactive oxygen species production.

    Guerra, Fermin E / Addison, Conrad B / de Jong, Nienke W M / Azzolino, Joseph / Pallister, Kyler B / van Strijp, Jos A G / Voyich, Jovanka M

    Journal of leukocyte biology

    2016  Volume 100, Issue 5, Page(s) 1005–1010

    Abstract: Neutrophils are the first line of defense after a pathogen has breached the epithelial barriers, and unimpaired neutrophil functions are essential to clear infections. Staphylococcus aureus is a prevalent human pathogen that is able to withstand ... ...

    Abstract Neutrophils are the first line of defense after a pathogen has breached the epithelial barriers, and unimpaired neutrophil functions are essential to clear infections. Staphylococcus aureus is a prevalent human pathogen that is able to withstand neutrophil killing, yet the mechanisms used by S. aureus to inhibit neutrophil clearance remain incompletely defined. The production of reactive oxygen species (ROS) is a vital neutrophil antimicrobial mechanism. Herein, we test the hypothesis that S. aureus uses the SaeR/S two-component gene regulatory system to produce virulence factors that reduce neutrophil ROS production. With the use of ROS probes, the temporal and overall production of neutrophil ROS was assessed during exposure to the clinically relevant S. aureus USA300 (strain LAC) and its isogenic mutant LACΔsaeR/S Our results demonstrated that SaeR/S-regulated factors do not inhibit neutrophil superoxide (O
    MeSH term(s) Bacterial Proteins/genetics ; Bacterial Proteins/physiology ; Catalase/analysis ; Gene Expression Regulation, Bacterial ; Humans ; Hydrogen Peroxide/blood ; Hypochlorous Acid/blood ; Luminol ; Neutrophils/metabolism ; Neutrophils/microbiology ; Phagocytosis ; Protein Kinases/deficiency ; Protein Kinases/genetics ; Protein Kinases/physiology ; Reactive Oxygen Species/blood ; Respiratory Burst ; Staphylococcus aureus/genetics ; Staphylococcus aureus/pathogenicity ; Staphylococcus aureus/physiology ; Superoxides/blood ; Transcription Factors/genetics ; Transcription Factors/physiology ; Virulence
    Chemical Substances Bacterial Proteins ; Reactive Oxygen Species ; SaeR protein, Staphylococcus aureus ; Transcription Factors ; Superoxides (11062-77-4) ; Luminol (5EXP385Q4F) ; Hypochlorous Acid (712K4CDC10) ; Hydrogen Peroxide (BBX060AN9V) ; Catalase (EC 1.11.1.6) ; Protein Kinases (EC 2.7.-) ; SaeS protein, Staphylococcus aureus (EC 2.7.3.-)
    Language English
    Publishing date 2016-11
    Publishing country United States
    Document type Journal Article
    ZDB-ID 605722-6
    ISSN 1938-3673 ; 0741-5400
    ISSN (online) 1938-3673
    ISSN 0741-5400
    DOI 10.1189/jlb.4VMAB0316-100RR
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Immune evasion by a staphylococcal inhibitor of myeloperoxidase.

    de Jong, Nienke W M / Ramyar, Kasra X / Guerra, Fermin E / Nijland, Reindert / Fevre, Cindy / Voyich, Jovanka M / McCarthy, Alex J / Garcia, Brandon L / van Kessel, Kok P M / van Strijp, Jos A G / Geisbrecht, Brian V / Haas, Pieter-Jan A

    Proceedings of the National Academy of Sciences of the United States of America

    2017  Volume 114, Issue 35, Page(s) 9439–9444

    Abstract: Staphylococcus ... ...

    Abstract Staphylococcus aureus
    MeSH term(s) Bacterial Proteins ; Gene Expression Regulation, Bacterial ; Humans ; Models, Molecular ; Neutrophils/physiology ; Peroxidase/antagonists & inhibitors ; Phagocytosis ; Protein Binding ; Protein Conformation ; Staphylococcus aureus/metabolism ; Up-Regulation
    Chemical Substances Bacterial Proteins ; Peroxidase (EC 1.11.1.7)
    Language English
    Publishing date 2017-08-14
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1707032114
    Database MEDical Literature Analysis and Retrieval System OnLINE

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