What question did this study set out to answer?

To explore the roles of CCL20 and CCR6 in psoriasis and atopic dermatitis pathogenesis.

The CCL20–CCR6 axis predominantly drives IL-17–mediated psoriasis while modestly contributing to papain-induced type 2 inflammation

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Randomized trial investigates CCL20-CCR6's role in psoriasis and type 2 inflammation, suggesting it as a therapeutic target.

To explore the roles of CCL20 and CCR6 in psoriasis and atopic dermatitis pathogenesis.
Generated CCL20- and CCR6-deficient (KO) mice for experimental models.
Employed imiquimod (IMQ) for psoriasis and papain for atopic dermatitis induction.
Assessed clinical scores, cytokine expression, and immune cell migration.
In IMQ-induced psoriasis, KO mice showed significantly reduced clinical scores and decreased Th17-related cytokines.
In papain-induced AD, KO mice exhibited approximately 40% reduction in disease severity with notable decreases in IL-4 and mast cell accumulation.
The CCL20-CCR6 axis primarily drives psoriasis pathogenesis, while its contribution to AD is limited.

Ekronarongchai et al. (2026) studied this question.

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