Abstract

Psoriasis is characterized by the rapid proliferation of keratinocytes, leading to erythematous plaques with silvery scales, skin pain, and impaired quality of life. Photodynamic therapy (PDT) has emerged as a promising treatment modality for various skin disorders, including psoriasis. Curcumin, a natural photosensitizer, possesses potent anti-inflammatory and antioxidant properties. In this study, we investigated the anti-inflammatory potential of synthetic curcuminoids combined with blue-light-mediated PDT for psoriasis treatment using human keratinocyte (HaCaT) cells. MTT assays demonstrated that the synthetic curcuminoids (1E,6E)-1,7-bis(5-methylthiophen-2-yl)hepta-1,6-diene-3,5-dione (No. 11) and (1E,6E)-1,7-di(thiophen-2-yl)hepta-1,6-diene-3,5-dione (No. 12) exhibited minimal cytotoxicity toward HaCaT cells. Upon ultraviolet–visible light irradiation, curcuminoid-treated cells generated intracellular reactive oxygen species, confirming the photodynamic activity induced by blue light exposure. Treatment with synthetic curcuminoids significantly suppressed the secretion of pro-inflammatory cytokines IL-17A/F and IL-8 in imiquimod-stimulated HaCaT cells, a commonly used psoriasis-like inflammatory model, indicating notable anti-inflammatory effects. Western blot analysis further revealed an increased Bax/Bcl-2 ratio in cells treated with synthetic curcuminoids No. 11 or No. 12 under photodynamic irradiation, suggesting the induction of apoptosis. Synthetic curcuminoids combined with blue-light PDT may represent a promising and cost-effective strategy for psoriasis.

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