Anti-inflammatory properties of a new undecyl-rhamnoside (APRC11) against P. acnes

Acne vulgaris is a skin disease affecting pilosebaceous glands in which Propionibacterium acnes ( P. acnes ) induced inflammation plays a central role. In order to develop new therapies against the inflammatory events, we evaluated the modulating effect of a new undecyl-rhamnoside, APRC11, on different markers of the inflammation. For this purpose, normal human keratinocytes taken from five healthy donors were pre-incubated for 24 h with APRC11 or Zinc Gluconate (Zn) which was used as reference molecule for its anti-inflammatory properties. Then, keratinocytes were stimulated with P. acnes Membrane Fraction for 6 h, in the presence of either APRC11 or Zn. Different markers were evaluated at mRNA level using a Luminex-based Quantigene array system and at protein level using an ELISA test and a Luminex array system. Results showed that P. acnes significantly increased the expression of IL-1α, IL-1RA, IL-8 and MMP-9. A 24-h treatment with APRC11 prior to the P. acnes stimulation down-regulated the P. acnes -induced cytokines over expression (IL-1α, IL-8 and MMP-9) and up-regulated IL-1RA level in a similar manner than Zn. These regulations were noted at both protein and mRNA levels. In conclusion, the new undecyl-rhamnoside APRC11 is able to down-regulate the expression of molecules implicated in cutaneous inflammation and whose expression is induced by P. acnes , confirming its potential interest in inflammatory acne.