Phellodendri Chinensis Cortex-Based Nanoparticles Integrated in Dissolvable Microneedles for Ameliorating Psoriasis-Like Inflammation

Psoriasis is a common and highly relapsing skin disease, for which topical treatments are used by approximately 88% of people with psoriasis as their primary therapy. However, in practice, the low convenience and side effects such as skin irritation of current topical treatments limit the application of the therapy. To address these issues, we calcined Phellodendri Chinensis Cortex (PCC) to prepare Phellodendri Chinensis Cortex Nanoparticles (PCC-NPs) which were packed into dissolvable microneedles (MNs) for the treatment of psoriasis. In this study, we revealed that the trace amounts of PCCNPs delivered by MNs could exert therapeutic effects therapeutic effects in the affected skin comparable to those of standard drugs, accompanied with the suppressed psoriasis-like inflammation without significant hepatic or renal toxicity or allergic reactions. These results indicate that dissolvable PCC-NPs MNs may serve as an innovative topical therapy for the inhibition of psoriatic inflammation.