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BackgroundCutibacterium acnes(C. acnes) is one of the most prevalent bacteria that form the human skin microbiota and, depending on multifactorial conditions it can help to maintain the skin homeostasis. Actually, different phylotypes ofC. acneshave been associated with different degrees of acne vulgaris development, while others, such as the H1 subtype, have been detected in patients with non-acneic skin. However, due to the physiology of the skin, the skin microbiota neither has direct access to the skin’s sebaceous glands nor to the main immune cells, as they are protected by a sebum layer. Therefore, the inter-kingdom communication relies on secreted factors and bacterial extracellular vesicles (EVs). In this context, the purpose of this project was to study the role of EVs secreted by three different phylotypes ofC. acnes(A1 as pathogenic, H1 as beneficial and H2 as commensal).ResultsMain findings showed that the proteomic profile of the cargo embodied in the EVs reflects unique characteristics of the differentC. acnesphylotypes in terms of lifestyle, survival and virulence. Moreover,in vitroskin models showed an extended pro-inflammatory modulation of A1 EVs, while H1 EVs displayed a high sebum-reducing potential.ConclusionsThis study has highlighted the role ofC. acnesEVs as key modulators during skin alterations, specially H1 EVs as an alternative based-natural treatment to fight acne vulgaris symptomatology. |
