Related Experiment Video
Updated: Jul 1, 2026

Organotypic Tissue Model Systems for Investigating Host-Pathogen Interactions In Vitro
Published on: March 28, 2025
Biofilms in skin infections: Propionibacterium acnes and acne vulgaris
T Coenye1, K Honraet, B Rossel
1Laboratory for Pharmaceutical Microbiology, Ghent University, Ghent, Belgium, Oystershell NV, Drongen, Belgium. Tom.Coenye@UGent.be
Abstract:
It is generally accepted that many human infections are biofilm-related and that sessile (biofilm-grown) cells are highly resistant against antimicrobial agents. Propionibacterium acnes plays a role in the pathogenesis of acne vulgaris, a common disorder of the pilosebaceous follicles and it has been suggested that P. acnes cells residing within the follicles grow as a biofilm. Although P. acnes biofilms have not been observed directly in the pilosebaceous unit, the observation that P. acnes readily forms biofilm in vitro as well as on various medical devices in vivo, combined with the high resistance of sessile P. acnes cells and the increased production of particular virulence factors and qourum sensing molecules in sessile cells point in this direction. In addition, in vitro and in vivo biofilm formation has also been demonstrated for other microorganisms involved in skin diseases (including Staphylococcus aureus and Streptococcus pyogenes).
Insights
Propionibacterium acnes (P. acnes) may form biofilms in acne vulgaris, leading to increased resistance against antimicrobial treatments. This biofilm formation is suggested by P. acnes
Area of Science:
- Microbiology
- Dermatology
- Infectious Diseases
Background:
- Many human infections involve biofilms, where sessile cells exhibit high antimicrobial resistance.
- Propionibacterium acnes (P. acnes) is implicated in acne vulgaris pathogenesis.
- P. acnes is suspected to form biofilms within pilosebaceous follicles.
Purpose of the Study:
- To explore the potential for P. acnes biofilm formation in acne vulgaris.
- To understand the implications of P. acnes biofilm resistance.
Main Methods:
- Review of existing literature on P. acnes biofilm formation.
- Analysis of P. acnes behavior in vitro and in vivo.
- Comparison with biofilm formation in other skin pathogens.
Main Results:
- P. acnes readily forms biofilms in vitro and on medical devices in vivo.
- Sessile P. acnes cells show increased resistance and virulence factor production.
- Biofilm formation is also observed for Staphylococcus aureus and Streptococcus pyogenes.
Conclusions:
- Evidence suggests P. acnes forms biofilms in acne vulgaris, contributing to treatment resistance.
- Understanding P. acnes biofilms is crucial for developing effective acne therapies.
- Biofilm formation is a common mechanism in various skin infections.
Related Concept Videos
Acne Infection
The Skin Microbiota
Biofilms
Staphylococcal Skin Infections
Skin Diseases and Disorders
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
Accessory Structures of the Skin: Sebaceous Glands
These glands that produce the oils on the skin and hair are holocrine glands. The mature...

