Cited by 124Neutrophil, Myeloperoxidase and Oxidative MechanismsRedox biology and oxidative stressImmunodeficiency and Autoimmune Disorders

Neutrophil-mediated oxidative burst and host defense are controlled by a Vav-PLCγ2 signaling axis in mice

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Graham, Daniel B., Robertson, Charles M., Bautista, Jhoanne, Mascarenhas, Francesca, Diacovo, M. Julia, Montgrain, Vivianne, Lam, Siu Kit, Cremasco, Viviana +4 more·2007·Journal of Clinical Investigation

Abstract

Oxidative burst, a critical antimicrobial mechanism of neutrophils, involves the rapid generation and release of reactive oxygen intermediates (ROIs) by the NADPH oxidase complex. Genetic mutations in an NADPH oxidase subunit, gp91 (also referred to as NOX2), are associated with chronic granulomatous disease (CGD), which is characterized by recurrent and life-threatening microbial infections. To combat such infections, ROIs are produced by neutrophils after stimulation by integrin-dependent adhesion to the ECM in conjunction with stimulation from inflammatory mediators, or microbial components containing pathogen-associated molecular patterns. In this report, we provide genetic evidence that both the Vav family of Rho GTPase guanine nucleotide exchange factors (GEFs) and phospholipase C-gamma2 (PLC-gamma2) are critical mediators of adhesion-dependent ROI production by neutrophils in mice. We also demonstrated that Vav was critically required for neutrophil-dependent host defense against systemic infection by Staphylococcus aureus and Pseudomonas aeruginosa, 2 common pathogens associated with fatal cases of hospital-acquired pneumonia. We identified a molecular pathway in which Vav GEFs linked integrin-mediated signaling with PLC-gamma2 activation, release of intracellular Ca2+ cations, and generation of diacylglycerol to control assembly of the NADPH oxidase complex and ROI production by neutrophils. Taken together, our data indicate that integrin-dependent signals generated during neutrophil adhesion contribute to the activation of NADPH oxidase by a variety of distinct effector pathways, all of which require Vav.

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Crossref · 10.1172/jci32729

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  • PLCγ2 is critical for neutrophil-dependent host defense against bacterial infections in vivo.

    “In addition to FcR signaling requiring PLCγ2 for efficient ROS production in murine neutrophils, PLCγ2 is also essential for postintegrin signaling induction of ROS, as well as being critical for the neutrophil-dependent host defense against bacterial infections in vivo (80).”

    From The role of PLCγ2 in immunological disorders, cancer, and neurodegeneration (2021) · cites this paper as [80]

    The Figure 3/Figure 6 passages show that PLC-γ2-deficient neutrophils fail to produce reactive oxygen intermediates after adhesion-dependent stimulation. The in vivo bacterial-infection experiments described with Figure 2 tested Vav-deficient mice, not PLC-γ2-deficient mice, so the paper does not directly establish that PLC-γ2 is critical for host defense in vivo. (LLM, conf=0.88)

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Authors
Graham, D. B., Robertson, C. M., Bautista, J., Mascarenhas, F., Diacovo, M. J., Montgrain, V., Lam, S. K., Cremasco, V., Dunne, W. M., Faccio, R., Coopersmith, C. M., & Swat, W.
Affiliations
Washington University in St. Louis (US)
Corresponding author
Swat, Wojciech
Venue
Journal of Clinical Investigation
Published
2007-11-01
Volume
117
Issue
11
Pages
3445-3452
ISSN
0021-9738 (ISSN-L)
OpenAlex
W1987998552
Cited by
124
References
55
Citations by year
2026: 4 · 2025: 3 · 2024: 4 · 2023: 7 · 2021: 8 · 2020: 6 · 2019: 2 · 2018: 4 · 2017: 3 · 2016: 7 · 2015: 5 · 2014: 4 · 2013: 15 · 2012: 10
FWCI
3.10
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Digital Commons@Becker (Washington University School of Medicine) (submittedVersion)
Funders
  • National Institutes of Health (GM072808)
  • National Cancer Institute (T32CA009547)
  • National Institute of General Medical Sciences (R01GM072808, GM 072808, GM66202, R01GM066202)
  • National Institute of Allergy and Infectious Diseases (AI 063024-02, AI-06107703)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Neutrophil, Myeloperoxidase and Oxidative Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Life Sciences › Immunology and Microbiology › Immunology › Immunodeficiency and Autoimmune Disorders
Keywords
neutrophil respiratory burst, Vav, PLCγ2, NADPH oxidase, NOX2, integrin signaling, neutrophil adhesion, reactive oxygen species, chronic granulomatous disease, Staphylococcus aureus, Pseudomonas aeruginosa, diacylglycerol, intracellular calcium, host defense, nosocomial pneumonia
MeSH terms
Animals, Calcium, Cell Adhesion, Diglycerides, Granulomatous Disease, Chronic, Humans, Neutrophils, Pseudomonas Infections, Staphylococcal Infections, Signal Transduction, Respiratory Burst, Reactive Oxygen Species, Mice, Knockout, Pneumonia, Bacterial, Sepsis, NADPH Oxidases, Protein Subunits, Mice, Proto-Oncogene Proteins c-vav, Phospholipase C gamma

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