Mechanism of anti-inflammatory effects of Rifampicin in an ex vivo culture system of Hidradenitis Suppurativa

Isabel Haferland, Chantal M Wallenwein, Tanja Ickelsheimer, Sandra Diehl, Matthias G Wacker, Susanne Schiffmann, Claudia Buerger, Roland Kaufmann, Anke Koenig, Andreas Pinter
Hidradenitis suppurativa (HS) is a chronic inflammatory skin disease of the hair follicles leading to painful lesions, associated with increased levels of pro-inflammatory cytokines. Numerous guidelines recommend antibiotics like clindamycin and rifampicin in combination, as first-line systemic therapy in moderate to severe forms of inflammation. HS has been proposed to be mainly an auto-inflammatory disease associated with but not initially provoked by bacteria. Therefore, it has to be assumed
more » ... that the pro-inflammatory milieu previously observed in HS skin is not solely dampened by the bacteriostatic inhibition of DNA-dependent RNA polymerase. To further clarify the mechanism of anti-inflammatory effects of rifampicin, ex vivo explants of lesional HS from 8 HS patients were treated with rifampicin, and its effect on cytokine production, immune cells as well as the expression of Toll-like receptor 2 (TLR2) were investigated. Analysis of cell culture medium of rifampicin treated HS explants revealed an anti-inflammatory effect of rifampicin that significantly inhibiting interleukin (IL)-1β, IL-6, IL-8, IL-10, and tumour necrosis factor (TNF) -α production. Immunohistochemistry of the rifampicin-treated explants suggested a tendency for it to reduce the expression of TLR2 while not affecting the number of immune cells.
doi:10.1111/exd.14531 pmid:35048417 fatcat:3uzsot47fffchkkzi46auyz7f4