ArticleExperimental & molecular medicine2026
Epidermal MHC-II-mediated NK cell recruitment triggers keratinocyte pyroptosis, facilitating pathogenesis of psoriasis.
Article in Experimental & molecular medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Psoriasis is a chronic inflammatory disease characterized by dysregulated interactions between keratinocytes (KCs) and immune cells. However, the details of KCs orchestrating the immune cell infiltration, particularly for natural killer (NK) cells, remain unclear. Here NK cell infiltration is significantly increased in psoriatic skin lesions, and the application of anti-MHC-II treatment or knockout of H2-Ab1 in the epidermis dramatically reduces IMQ-mediated psoriatic dermatitis as well as the infiltration of NK cells through CXCL10 mediated by the ERK-CREB axis. Spatial transcriptomics reveal that NK cells coexist with KCs, driven by enhanced CXCL signaling, and epidermal H2-Ab1 deletion suppresses KC-NK cell communication. NK cells release granzyme B, inducing pyroptosis in adjacent GSDME-expressing KCs, contributing to the inflammatory response. NK cell depletion or Gsdme knockout reduces pyroptosis and alleviates psoriasis-like dermatitis. Multicolor immunohistochemistry confirms that epidermal MHC-II expression in psoriatic lesions correlates positively with NK cell, granzyme B and cleaved-GSDME levels. This study reveals that epidermal MHC-II attracts NK cells, triggering KC pyroptosis and remodeling the immune microenvironment in psoriasis, offering novel insights into its pathogenesis.
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