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Related Concept Videos

Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
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Colonisation of Pathogens

Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
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Development and Assessment of Intracellular Infection Models for Staphylococcus aureus
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Staphylococcal superantigens in colonization and disease.

Stacey X Xu1, John K McCormick

  • 1Department of Microbiology and Immunology, Centre for Human Immunology, Schulich School of Medicine and Dentistry, University of Western Ontario, London ON, Canada.

Frontiers in Cellular and Infection Microbiology
|August 25, 2012
PubMed
Summary

Superantigens (SAgs) are bacterial toxins from Staphylococcus aureus that cause diseases like toxic shock syndrome. Their exact role in bacterial life cycles and the reason for their diversity remain unknown.

Keywords:
Staphylococcus aureuscolonizationstaphylococcal enterotoxinsuperantigen

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Area of Science:

  • Microbiology
  • Immunology
  • Toxicology

Background:

  • Superantigens (SAgs) are potent exotoxins produced by bacterial pathogens, notably Staphylococcus aureus.
  • Over 20 distinct SAgs are known, with most clinical S. aureus strains carrying SAg genes.
  • SAgs are linked to food poisoning, toxic shock syndrome (TSS), Kawasaki disease (KD), atopic dermatitis (AD), and chronic rhinosinusitis (CRS).

Purpose of the Study:

  • To review recent advancements in understanding the molecular biology of SAgs.
  • To explore the function and role of SAgs in Staphylococcus aureus colonization and pathogenesis.
  • To address the unresolved questions regarding the purpose of SAgs in the S. aureus life cycle and the diversity of these toxins.

Main Methods:

  • Literature review of recent studies on SAg molecular biology, structure, and function.
  • Analysis of the role of SAgs in bacterial pathogenesis and host immune responses.
  • Synthesis of current knowledge on SAg involvement in various diseases.

Main Results:

  • Detailed understanding of SAg mechanisms of action, structures, and functions has been achieved.
  • SAgs are confirmed causative agents of diseases like TSS, food poisoning, KD, AD, and CRS.
  • The evolutionary purpose and ecological role of SAgs in S. aureus remain elusive.

Conclusions:

  • While SAg mechanisms and disease associations are well-documented, their fundamental role in S. aureus biology is still unclear.
  • Further research is needed to elucidate the evolutionary advantage and functional significance of the diverse array of SAgs produced by S. aureus.
  • Understanding SAg function could reveal novel therapeutic targets for S. aureus infections and related inflammatory conditions.