Related Experiment Video
Updated: Mar 1, 2026
07:10
A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
Published on: February 19, 2019
9.5K
Skin androgens regulate Staphylococcus aureus pathogenicity via quorum sensing
Maria Sindhura John1, Mahendran Chinnappan1, Camille I Sturges1
1Department of Dermatology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
Nature Microbiology
|February 27, 2026
Summary
Skin cells produce testosterone, which increases the risk of bacterial skin infections like MRSA. Blocking this effect may offer new ways to treat infections.
Area of Science:
- Microbiology
- Dermatology
- Biochemistry
Background:
- Skin cells secrete testosterone, with higher levels in males.
- Males exhibit increased susceptibility to skin infections compared to females.
- Methicillin-resistant Staphylococcus aureus (MRSA) is a significant pathogen causing skin infections.
Purpose of the Study:
- To investigate the role of skin-secreted testosterone in MRSA infections.
- To elucidate the mechanism by which testosterone influences S. aureus virulence.
- To explore potential therapeutic strategies targeting the testosterone-AgrC interaction.
Main Methods:
- Generation of testosterone-deficient skin in mice.
- Analysis of S. aureus virulence factor expression.
- Quorum-sensing pathway activation studies (agr pathway).
- Mutational analysis of S. aureus AgrC.
- In silico molecular docking simulations.
- Testing of testosterone isomers for anti-virulence activity.
Main Results:
- Testosterone-deficient skin mice showed resistance to MRSA infections.
- Testosterone enhanced S. aureus cytotoxic virulence factor expression via the agr pathway.
- Testosterone's effect was concentration-dependent and independent of auto-inducing peptides.
- A functional AgrC histidine kinase in S. aureus was essential for testosterone's effect.
- In silico analysis suggested direct interaction between testosterone and AgrC.
- Enantiomer-testosterone blocked bacterial quorum sensing and reduced S. aureus-induced cytotoxicity.
Conclusions:
- Skin-secreted testosterone promotes S. aureus virulence by activating the AgrC pathway.
- Testosterone directly interacts with AgrC, influencing bacterial communication and virulence.
- Targeting the testosterone-AgrC interaction presents a novel therapeutic avenue for managing S. aureus skin infections.
Related Concept Videos
01:28Gene Regulation in Microbial Communities: Quorum Sensing
779
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
779
01:30Bacterial Signaling
42.2K
Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
42.2K
01:28Global Regulatory Systems
789
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
789
01:31Defense Against Bacterial Pathogens
3.2K
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
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...
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...
3.2K
01:23Skin Diseases and Disorders
5.9K
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...
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
5.9K
01:30Other Stress Responses in Bacteria
474
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
474