Related Experiment Video
Updated: Feb 28, 2026
Development and Assessment of Intracellular Infection Models for Staphylococcus aureus
Published on: January 17, 2025
Into the storm: Chasing the opportunistic pathogen Staphylococcus aureus from skin colonisation to life-threatening
1Department of Microbiology, School of Natural Sciences, National University of Ireland, Galway, Ireland.
Abstract:
Colonisation of the human skin by Staphylococcus aureus is a precursor for a variety of infections ranging from boils to sepsis and pneumonia. The rapid emergence of methicillin-resistant S. aureus following the clinical introduction of this antimicrobial drug and reports of resistance to all currently used anti-staphylococcal drugs has added to its formidable reputation. S. aureus survival on the skin and in vivo virulence is underpinned by a remarkable environmental adaptability, made possible by highly orchestrated regulation of gene expression and a capacity to undertake genome remodelling. Depending on the ecological or infection niche, controlled expression of a variety of adhesins can be initiated to facilitate adherence to extracellular matrix proteins, survival against desiccation or biofilm accumulation on implanted medical devices and host tissue. These adherence mechanisms complement toxin and enzyme production, immune evasion strategies, and antibiotic resistance and tolerance to collectively thwart efforts to develop reliable antimicrobial drug regimens and an effective S. aureus vaccine.
Insights
Staphylococcus aureus colonizes skin, leading to infections. Its adaptability, gene regulation, and resistance mechanisms challenge treatments and vaccine development.
Area of Science:
- Microbiology
- Infectious Diseases
- Molecular Biology
Background:
- Staphylococcus aureus skin colonization precedes diverse infections, including sepsis and pneumonia.
- Emergence of methicillin-resistant S. aureus (MRSA) and multi-drug resistance complicates treatment.
- S. aureus exhibits significant environmental adaptability, crucial for its virulence.
Purpose of the Study:
- To explore the adaptability mechanisms of S. aureus.
- To understand how S. aureus evades antimicrobial drugs and immune responses.
- To identify challenges in developing effective S. aureus vaccines and treatments.
Main Methods:
- Analysis of S. aureus gene expression regulation.
- Investigation of genome remodeling capabilities.
- Examination of adhesin expression in different niches.
- Review of virulence factors including toxins, enzymes, and immune evasion strategies.
Main Results:
- S. aureus adaptability is driven by orchestrated gene regulation and genome remodeling.
- Adhesin expression facilitates adherence to host tissues and medical devices.
- Virulence is enhanced by toxins, immune evasion, and antibiotic resistance.
- These factors collectively hinder effective antimicrobial and vaccine strategies.
Conclusions:
- S. aureus possesses sophisticated mechanisms for survival and virulence.
- Targeting adaptability and resistance is crucial for novel therapeutic approaches.
- Developing effective S. aureus vaccines and treatments remains a significant challenge.
More Related Videos
Related Concept Videos
01:23Skin Diseases and Disorders
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
01:31Defense Against Bacterial Pathogens
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
01:26Healthcare Associated Infections I: Iatrogenic, Exogenic and Endogenic
HAIs significantly increase the cost of health care. Extended stays in healthcare institutions, increased disability, increased costs of medications, including specialized antibiotics, and prolonged recovery times add to the patient's expenses and the healthcare institution and funding bodies.
01:20Infection
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
01:26Factors Affecting the Risk of Infection
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin...
01:25Urinary Tract Infection II: Pathophysiology