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Related Experiment Video

Updated: Mar 1, 2026

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

Published on: February 19, 2019

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

This summary is machine-generated.

Skin cells produce testosterone, which increases the risk of bacterial skin infections like MRSA. Blocking this effect may offer new ways to treat infections.

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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.