N-butanol extract of Broussonetia papyrifera (L.) L′Hér. ex Vent root bark alleviates atopic dermatitis by targeting E3 ubiquitin ligase WWP1 to promote NLRP3 degradation

Broussonetia papyrifera (L.) L'Hér. ex Vent (B. papyrifera) is a deciduous tree widely distributed in Asia. Previous studies have revealed that leaves of B. papyrifera ameliorated atopic dermatitis (AD)-like symptoms and inflammatory response. However, the impact and underlying mechanism of other parts of B. papyrifera on AD remain elusive.