1. Development and characterization of a 3D in vitro model mimicking acneic skin
- Author
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L. Marchand, Romain Jugé, P. Rouaud-Tinguely, Elodie Aymard, Marine Laclaverie, Brigitte Closs, and Christine Grimaldi
- Subjects
Keratinocytes ,Squalene ,0301 basic medicine ,Virulence ,Inflammation ,Dermatology ,Models, Biological ,Biochemistry ,030207 dermatology & venereal diseases ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Skin Physiological Phenomena ,Acne Vulgaris ,medicine ,Humans ,Propionibacterium acnes ,Molecular Biology ,Acne ,Barrier function ,integumentary system ,Epidermis (botany) ,business.industry ,medicine.disease ,In vitro ,Pathophysiology ,Sebum ,030104 developmental biology ,chemistry ,Immunology ,Cytokines ,Epidermis ,medicine.symptom ,business - Abstract
Acne is an inflammatory skin disease of the pilosebaceous unit, involving four essential factors: hyperseborrhoea combined to a modification of sebum composition, colonization by Cutibacterium (C.) acnes, hyperkeratinization and secreted inflammation. Understanding and mimicking compromised skin is essential to further develop appropriate therapeutic solutions. This study aimed to develop new in vitro 3D models mimicking acneic skin, by combining two main factors involved in the physiopathology, namely, altered sebum composition and C. acnes invasion. Normal human keratinocytes were first used to generate reconstructed human epidermis (RHE) that were then left untreated (control) or treated topically with a combination of both peroxidized squalene and C. acnes cultures. Once validated, this model considered relevant to mimic acneic skin, was further improved by using different phylotypes of C. acnes strains specifically isolated from healthy and acneic patients. While both phylotypes IB and II did not significantly alter RHE, C. acnes IA1 strains induce major acneic skin hallmarks such as hyperkeratinization, secreted inflammation and altered barrier function. Interestingly, these results are obtained independently of the origin of IA1 phylotypes (acneic vs. healthy patient), thus suggesting a role of the ecosystem in controlling C. acnes virulence in healthy skin. In conclusion, by combining two major factors involved in the physiopathology of acne, we (1) succeeded to design in vitro 3D models mimicking this skin disorder and (2) highlighted how C. acnes phylotypes can have an impact on epidermal physiology. These relevant models will be suitable for the substantiation of therapeutic molecules dedicated to acne treatment.
- Published
- 2021
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