Unraveling the Enigmatic Behavior of Cutibacterium acnes : Exploring Clinical Correlations and Behaviors of Clinical Strains in Prosthetic Joint Infections
Abstract
Cutibacterium acnes is an anaerobic bacterium isolated from prosthetic joint infections (PJI), an infection which does not induce clinically relevant symptoms for patients without fever, serum inflammatory markers and has a very indolent course. C. acnes species participates in the balance of skin microbiota but is also responsible for infections; this species is regarded as an opportunistic pathogen or pathobiont. The aim of this study was to determine the existence of a correlation between clinical infectious characteristics of patients and C. acnes clinical strains behaviors. They were evaluated through the determination of bacterial internalization, persistence rate into osteoblast-like cells, and biofilm formation capacity before interaction and for internalized bacteria. This phenomenon could play a role in infections without having yet been observed in vivo. A total of 28 clinical strains were isolated and analyzed from patients with C. acnes PJI. Similar infectious clinical characteristics were observed among the PJI patients, whereas the associated clinical strains have various and heterogeneous behaviors in the in vitro assay of this study. Most of the tested C. acnes strains (75%) were internalized into osteoblast-like cells with a higher rate of C. acnes strains with phylotype IA1 than other phylotypes (IB and II). High internalization rates of C. acnes in osteoblast-like cells seemed to be associated with strains isolated from patients with no local inflammatory symptoms, especially articular stiffness profile. All the strains were able to form biofilm, and internalization into osteoblast-like cells modified the capacity of clinical strains to form biofilm significantly for seven clinical strains (25%), associated with the presence of a high level of polymorphonuclear leukocytes-patient blood with PJI from whom these strains were isolated. In our cohort, the persistence rate of C. acnes strains in osteoblast cells is less important for strains isolated from patients with tobacco use. This study raises the hypothesis that the interaction between bone environment, host, and strain modulates C. acnes ability to stimulate inflammatory symptoms in patients with C. acnes PJI.
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BibTeX
@article{celine2026unraveling,
title = {{Unraveling the Enigmatic Behavior of Cutibacterium acnes : Exploring Clinical Correlations and Behaviors of Clinical Strains in Prosthetic Joint Infections}},
author = {Mongaret Céline and Varin-Simon Jennifer and Ohl Xavier and Fulbert Baptiste and Gangloff Sophie and Kanagaratnam Lukshe and Reffuveille Fany},
journal = {International Journal of Microbiology},
year = {2026},
month = oct,
doi = {10.1155/ijm/8475639},
url = {https://hal.science/hal-05796786v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Unraveling the Enigmatic Behavior of Cutibacterium acnes : Exploring Clinical Correlations and Behaviors of Clinical Strains in Prosthetic Joint Infections
AU - Mongaret Céline
AU - Varin-Simon Jennifer
AU - Ohl Xavier
AU - Fulbert Baptiste
AU - Gangloff Sophie
AU - Kanagaratnam Lukshe
AU - Reffuveille Fany
PY - 2026
DA - 2026/10/13
JO - International Journal of Microbiology
DO - 10.1155/ijm/8475639
UR - https://hal.science/hal-05796786v1
AB - Cutibacterium acnes is an anaerobic bacterium isolated from prosthetic joint infections (PJI), an infection which does not induce clinically relevant symptoms for patients without fever, serum inflammatory markers and has a very indolent course. C. acnes species participates in the balance of skin microbiota but is also responsible for infections; this species is regarded as an opportunistic pathogen or pathobiont. The aim of this study was to determine the existence of a correlation between clinical infectious characteristics of patients and C. acnes clinical strains behaviors. They were evaluated through the determination of bacterial internalization, persistence rate into osteoblast-like cells, and biofilm formation capacity before interaction and for internalized bacteria. This phenomenon could play a role in infections without having yet been observed in vivo. A total of 28 clinical strains were isolated and analyzed from patients with C. acnes PJI. Similar infectious clinical characteristics were observed among the PJI patients, whereas the associated clinical strains have various and heterogeneous behaviors in the in vitro assay of this study. Most of the tested C. acnes strains (75%) were internalized into osteoblast-like cells with a higher rate of C. acnes strains with phylotype IA1 than other phylotypes (IB and II). High internalization rates of C. acnes in osteoblast-like cells seemed to be associated with strains isolated from patients with no local inflammatory symptoms, especially articular stiffness profile. All the strains were able to form biofilm, and internalization into osteoblast-like cells modified the capacity of clinical strains to form biofilm significantly for seven clinical strains (25%), associated with the presence of a high level of polymorphonuclear leukocytes-patient blood with PJI from whom these strains were isolated. In our cohort, the persistence rate of C. acnes strains in osteoblast cells is less important for strains isolated from patients with tobacco use. This study raises the hypothesis that the interaction between bone environment, host, and strain modulates C. acnes ability to stimulate inflammatory symptoms in patients with C. acnes PJI.
SN - 1687-918X
SN - 1687-9198
ER -