Polyozellin alleviates atopic dermatitis-like inflammatory and pruritic responses in activated keratinocytes and mast...

Area of Science:

• Pharmacology
• Dermatology
• Immunology

Background:

• Polyozellus multiplex is an edible mushroom with known therapeutic properties.
• Polyozellin, a key compound, shows promise for inflammation, cancer, and oxidative stress.
• Atopic dermatitis (AD) involves significant inflammatory and pruritic responses.

Purpose of the Study:

• To investigate the pharmacological effects of polyozellin on atopic dermatitis (AD).
• To elucidate the mechanism of action of polyozellin in mitigating AD symptoms.
• To evaluate polyozellin's impact on both inflammatory and pruritic responses in AD.

Main Methods:

• In vitro studies on activated keratinocytes to assess inflammatory cytokine and chemokine expression.
• In vivo studies using a Dermatophagoides farinae extract (DFE)/2,4-dinitrochlorobenzene (DNCB)-induced AD mouse model.
• Histological and immunological analyses to evaluate skin inflammation, mast cell infiltration, and serum histamine levels.
• Assessment of mast cell degranulation and histamine release.

Main Results:

• Polyozellin inhibited inflammatory cytokines and chemokines by blocking signal transducer and activator of transcription 1 (STAT1) and nuclear factor-κB (NF-κB) pathways in keratinocytes.
• Oral polyozellin treatment significantly attenuated DFE/DNCB-induced skin inflammation in the AD model.
• Polyozellin reduced mast cell infiltration, serum histamine levels, and associated scratching behaviors.
• The compound also decreased immunoglobulin E (IgE)-stimulated mast cell degranulation.

Conclusions:

• Polyozellin demonstrates significant anti-inflammatory and anti-pruritic effects relevant to atopic dermatitis (AD).
• Its mechanism involves the inhibition of key inflammatory signaling pathways and mast cell-mediated histamine release.
• Polyozellin presents a potential therapeutic agent for managing the complex symptoms of AD.