Acne vulgaris is a chronic inflammatory cutaneous disease. 5-Aminolaevulinic acid photodynamic therapy (ALA-PDT) is a novel and effective approach for severe acne vulgaris treatment. However, its specific treatment mechanism still remains unclear. In the present study, we investigated the potential mechanism of how ALA-PDT regulated intense inflammatory response in acne vulgaris. It appeared that ALA-PDT suppresses proliferation and lipid secretion of primary human sebocytes. Besides, ALA-PDT could up-regulate the expression of CXCL8 in vivo and in vitro, amplifying the inflammatory response by recruiting T cells, B cells, neutrophils and macrophages. We also found that ALA-PDT elevated the expression of CXCL8 via p38 pathway. SB203580, a p38 pathway inhibitor, decreased the expression of CXCL8 in sebocytes after ALA-PDT. These findings indicate that ALA-PDT amplifies the intense inflammatory response in the treatment of acne vulgaris via CXCL8. Our data decipher the mechanism of intense inflammatory response after ALA-PDT for acne vulgaris.
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