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The interaction between keratinocytes and immune cells plays a major role in the development of inflammatory skin diseases like psoriasis and atopic dermatitis. Pharmacological intervention to inhibit T cell–derived proinflammatory mediators is an effective therapy in the treatment of psoriasis. Here, we present a model to study the interaction between keratinocytes and T cells in a three-dimensional (3D) microenvironment, based on human skin equivalents populated with CD4+ T cells. T cell migration into the dermis initiated keratinocyte activation within 2 days, with hallmarks of a psoriasiform inflammation after 4 days. Expression of epidermal psoriasis marker genes was upregulated, and proinflammatory cytokines and chemokines were highly expressed. Disturbed epidermal differentiation was shown by downregulated filaggrin expression and involucrin expression in the spinous layer. These effects were …