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Related Concept Videos

Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

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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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The Skin Microbiota01:27

The Skin Microbiota

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The human skin serves as a complex ecosystem inhabited by a diverse community of microorganisms, including bacteria, fungi, and viruses. This microbiome plays a critical role in maintaining skin health and defending against pathogenic invaders. The composition of microbial communities varies significantly across different regions of the body, influenced primarily by the local levels of moisture and sebum.Regional Variation in Skin MicrobiotaCutibacterium acnes predominantly colonizes sebaceous...
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Skin Diseases and Disorders01:23

Skin Diseases and Disorders

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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
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Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

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Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and...
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Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

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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...
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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
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Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
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Staphylococcus aureus and the skin: a longstanding and complex interaction.

Russell E N Becker, Juliane Bubeck Wardenburg

    Skinmed
    |July 4, 2015
    PubMed
    Summary

    Staphylococcus aureus causes common skin infections and can spread to other tissues. Research is exploring how this bacterium adapts to the skin to cause disease, aiming for new treatments.

    Area of Science:

    • Microbiology and Infectious Diseases
    • Bacterial Pathogenesis
    • Host-Pathogen Interactions

    Background:

    • Staphylococcus aureus is a major human pathogen capable of infecting diverse tissues.
    • Skin colonization by S. aureus is common, as it resides in the commensal flora of up to 50% of the population.
    • The transition of S. aureus from commensal colonization to invasive disease is not fully understood.

    Purpose of the Study:

    • To elucidate the molecular mechanisms underlying Staphylococcus aureus adaptation to the skin.
    • To define host factors influencing susceptibility to S. aureus colonization and infection.
    • To guide the development of novel strategies for preventing and treating S. aureus infections.

    Main Methods:

    • Investigating bacterial adaptation mechanisms in the skin microenvironment.

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  • Analyzing host genetic and molecular factors predisposing to S. aureus colonization.
  • Utilizing in vitro and in vivo models to study pathogenesis.

    • Main Results:

    • Identifying key bacterial virulence factors involved in skin colonization.
    • Characterizing host immune responses that permit or restrict S. aureus growth.
    • Defining pathways for S. aureus transition from superficial to invasive infections.

    Conclusions:

    • Understanding S. aureus skin adaptation is crucial for deciphering disease pathogenesis.
    • Identifying host susceptibility factors can inform targeted preventive measures.
    • This research lays the groundwork for developing innovative therapeutic interventions against S. aureus infections.