The Role of Selected Proteins in the Pathogenesis of Psoriasis.

Psoriasis is a chronic, immune-mediated inflammatory skin disease with complex genetic, environmental, and immunological determinants. Beyond the skin, it affects multiple systems, including the joints and cardiovascular system. A hallmark of psoriasis is an overactivation of the innate and adaptive immune responses, leading to dysregulated cytokine signaling, altered keratinocyte function, and aberrant expression of structural and regulatory proteins. In recent years, growing attention has been given to the skin as a neuro-immuno-endocrine organ, with evidence showing the role of stress-related neuropeptides, UVB-induced immune modulation, and vitamin D signaling in the disease pathogenesis. This review highlights emerging evidence on key multifunctional proteins-elafin, chemerin, and NAMPT (visfatin)-that exert both pro- and anti-inflammatory actions. Although still underexplored, these molecules appear to contribute significantly to the psoriatic microenvironment by modulating inflammation, immunity, and skin barrier function. Their dual roles suggest complex interactions within the cutaneous immune-neuroendocrine network, positioning them as potential biomarkers or therapeutic targets in psoriasis. By integrating insights into classical and emerging mediators, this review aims to provide a comprehensive perspective on the evolving landscape of psoriasis pathophysiology.