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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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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

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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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Microbiome of the Eye01:22

Microbiome of the Eye

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The human eye has a specialized microbiota that reflects its unique anatomical and immunological environment. This low-biomass microbial community predominantly colonizes the conjunctiva and eyelid margins, playing a vital role in ocular surface homeostasis and defense. Despite its proximity to the richly colonized facial skin, the ocular surface maintains a distinct microbial profile due to continuous mechanical and biochemical defense mechanisms.The conjunctival surface hosts fewer microbial...
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Clinical Applications of Epidermal Stem Cells01:19

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Epidermal stem cells (EpiSCs) are mainly located at the basal layer of the epidermis. These cells repair minor injuries of the skin and replace dead skin cells. However, EpiSCs’ cannot heal severe wounds such as major burns or those from diabetes or hereditary disorders. In such cases, culturing the epidermal stem cells from the patient is possible and has yielded successful treatment options, such as laboratory-grown skin grafts. These grafts are synthesized using a patient’s own...
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Subcutaneous Infection of Methicillin Resistant Staphylococcus Aureus MRSA
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Staphylococcus epidermidis Sets Things Right Again.

Yuliya Skabytska1, Tilo Biedermann1

  • 1Department of Dermatology and Allergology, Technical University Munich, Munich, Germany.

The Journal of Investigative Dermatology
|February 24, 2016
PubMed
Summary
This summary is machine-generated.

Staphylococcus epidermidis helps maintain skin balance by reducing inflammation. Its lipoteichoic acid triggers a pathway that lowers inflammatory responses to Propionibacterium acnes.

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Area of Science:

  • Microbiology
  • Immunology
  • Dermatology

Background:

  • Commensal skin bacteria contribute to skin homeostasis.
  • These bacteria may counteract pathogenic inflammation.
  • Propionibacterium acnes is implicated in skin inflammation.

Purpose of the Study:

  • To investigate the role of Staphylococcus epidermidis in regulating Propionibacterium acnes-induced inflammation.
  • To elucidate the molecular mechanisms by which S. epidermidis influences skin immune responses.

Main Methods:

  • Investigated the interaction between S. epidermidis and P. acnes in a cellular model.
  • Analyzed the induction of microRNA-143 (miR-143) by staphylococcal lipoteichoic acid.
  • Assessed the effect of miR-143 on toll-like receptor 2 (TLR2) mRNA and protein expression.
  • Measured the impact on proinflammatory cytokine production in response to P. acnes.

Main Results:

  • Staphylococcus epidermidis lipoteichoic acid induces miR-143 expression.
  • miR-143 directly inhibits toll-like receptor 2 mRNA.
  • This leads to decreased TLR2 protein levels.
  • Reduced TLR2 signaling suppresses P. acnes-induced proinflammatory cytokine production.

Conclusions:

  • Staphylococcus epidermidis plays a regulatory role in P. acnes-induced skin inflammation.
  • The miR-143/TLR2 pathway is a key mechanism for this regulation.
  • This finding highlights the importance of commensal bacteria in maintaining skin immune homeostasis.