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Bacterial toxins are sophisticated virulence factors that enable pathogenic bacteria to interact with, invade, and damage host tissues. These toxins fall broadly into two types: protein exotoxins, which are secreted into the environment and target specific host receptors, and lipopolysaccharide endotoxins, which are structural components of the bacterial outer membrane released primarily during bacterial lysis or membrane shedding. Exotoxins generally act more selectively, binding to cell...
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Staphylococcus sciuri exfoliative toxin C is a dimer that modulates macrophage functions.

Haihua Li1, Xiaying Li, Ying Lu

  • 1State Key Laboratory of Agrobiotechnology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, People's Republic of China.

Canadian Journal of Microbiology
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PubMed
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Staphylococcus sciuri exfoliative toxin C (ExhC) inhibits macrophage phagocytosis and enhances inflammatory mediator production. This suggests ExhC plays a key role in the innate immune response to S. sciuri infections.

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Area of Science:

  • Microbiology
  • Immunology
  • Toxicology

Background:

  • Staphylococcus sciuri is a pathogen causing human infections.
  • A strain of S. sciuri carrying exfoliative toxin C (ExhC) has been linked to severe skin pathology in piglets and potential zoonotic transmission.
  • The pathogenicity of S. sciuri, particularly the role of ExhC, remains poorly understood.

Purpose of the Study:

  • To investigate the pathogenicity of Staphylococcus sciuri exfoliative toxin C (ExhC).
  • To examine the effects of recombinant ExhC (rExhC) on macrophage functions in vitro and in vivo.
  • To elucidate the role of ExhC in the innate immune response to S. sciuri.

Main Methods:

  • Production and purification of recombinant ExhC protein with a histidine tag (rExhC-his).
  • Assessment of rExhC activity using newborn mice as a model.
  • Investigation of rExhC's impact on macrophage phagocytosis using RAW264.7 cell lines.
  • Measurement of proinflammatory mediator production (interleukin-6, interleukin-12, tumor necrosis factor α, nitric oxide) by murine peritoneal macrophages and RAW264.7 cells upon exposure to rExhC.

Main Results:

  • Both native S. sciuri ExhC and rExhC were found to exist as dimers.
  • rExhC significantly inhibited the phagocytic activity of RAW264.7 cells.
  • rExhC enhanced the production of key proinflammatory mediators, including IL-6, IL-12, TNF-α, and nitric oxide, in macrophages.

Conclusions:

  • Exfoliative toxin C (ExhC) from Staphylococcus sciuri exhibits immunomodulatory functions.
  • ExhC's ability to inhibit phagocytosis and stimulate inflammatory responses suggests a significant role in the pathogenesis of S. sciuri infections.
  • ExhC may be a crucial factor in how S. sciuri evades or manipulates the host innate immune system.