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Hydroxychloroquine is a novel therapeutic approach for rosacea.

Int Immunopharmacol. 2020 Jan 06;79:106178

Authors: Li J, Yuan X, Tang Y, Wang B, Deng Z, Huang Y, Liu F, Zhao Z, Zhang Y

Rosacea is a chronic inflammatory disease in face. Hydroxychloroquine (HCQ), an anti-malaria drug, was reported to have anti-inflammation activities. However, the role of HCQ on rosacea remains unclear. In this study, we revealed the potential molecular mechanism by which HCQ improved rosacea in rosacea-like mice and mast cells (MCs). Moreover, the effects of HCQ treatment for rosacea patients were investigated. In this study, we found HCQ ameliorated the rosacea-like phenotype and MCs infiltration. The elevated pro-inflammatory factors and mast cell protease were significantly inhibited by HCQ treatment in rosacea-like mice. In vitro, HCQ suppresses LL37-induced MCs activation in vitro, including the release of inflammatory factors, chemotaxis, degranulation and calcium influx. Moreover, HCQ attenuated LL37-mediated MCs activation partly via inhibiting KCa3.1-mediated calcium signaling. Thus, these evidences suggest HCQ ameliorated rosacea-like dermatitis may be by regulating immune response of MCs. Finally, the 8-week HCQ treatment exerted satisfactory therapeutic effects on erythema and inflammatory lesions of rosacea patients, indicating that it is a promising drug for rosacea in clinical treatment.

PMID: 31918061 [PubMed - as supplied by publisher]  Full Text

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More Info
Hydroxychloroquine Suppresses LL37-induced Mast Cells

Plaquenil (Hydroxychloroquine)

"Interestingly, hydroxychloroquine, an antimalarial medication and disease-modifying antirheumatic drug (DMARD), demonstrated effectiveness in treating symptoms in a subgroup of the neurogenic rosacea patients."
Neurogenic Rosacea: What Pharmacists Should Know, Pharmacy Times

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