Abstract
Background Psoriasis is a chronic skin condition that is associated with
persistent inflammation and skin lesions. Topical therapy has been a promising
approach to the alleviation of psoriasis through the application of
anti-inflammatory agents. Phosphatidylserine (PS) administration has shown
anti-inflammatory effects in the trials. Consequently, the objective of this
study was to evaluate the effects of topical PS on the potential improvement of
an imiquimod (IMQ)-induced psoriasis model. Additionally, cyclosporine A was
utilized as a comparative anti-psoriatic agent in our study.
Methods The psoriasis model was established by topically applying IMQ to
the dorsal skin of mice once daily for five consecutive days. The efficacy of
topical PS was assessed using the Psoriasis Area and Severity Index (PASI) score
to evaluate skin lesions. Subsequently, the skin samples were analyzed using
Baker’s scoring system, Masson’s trichrome staining, immunohistochemistry, and
real-time PCR analysis.
Results IMQ-induced plaque-type psoriasis resulted in a significant
increase (P<0.05) in dermal thickness, hyperkeratosis, PASI score, and
inflammatory cytokines at the lesion site. The topical PS and cyclosporine A
significantly (P<0.05) reduced PASI score and dermal thickness, while
also alleviating erythema and scaling when compared to untreated mice.
Furthermore, biomolecular assessments revealed that PS significantly
(P<0.05) inhibited the gene expression of IL-17, IL-23, and TNF-α
cytokines in the IMQ-induced lesions.
Conclusion Topical PS may pointedly alleviate psoriasis through the
inhibition of inflammation. The beneficial effects of the PS recommend further
investigation in both experimental and clinical studies in the control of skin
psoriasis.
Keywords
phospholipid - inflammation - skin disease - psoriasis - animal