Psoriasis is a common chronic inflammatory skin disease with a complex pathogenesis that involves the dysregulation of multiple cellular components and interconnected molecular pathways. Signal transducer and activator of transcription 3 (STAT3) is a key transcription factor that integrates signals from multiple cytokines and growth factors to regulate gene expression involved in cell proliferation, survival, and inflammation. Emerging evidence has shown the pivotal role of STAT3 in driving the persistent inflammatory state and aberrant keratinocyte behavior characteristic of psoriasis. This review systematically summarizes the fundamental biological functions of STAT3 (including its phosphorylation, dimerization, and nuclear translocation processes) and its intrinsic mechanism of action in the pathological process of psoriasis. We focus on the critical regulatory role of STAT3 in psoriasis-related inflammatory signaling networks, detailing how it modulates the expression of pro-inflammatory mediators to influence abnormal immune responses and pathological keratinocyte proliferation in lesional skin. Furthermore, the review comprehensively evaluates the latest developments in STAT3-based targeted therapeutic strategies, including small-molecule inhibitors (eg, WB518 and quinone derivatives), biologics, and nucleic acid-based approaches (eg, siRNA and miRNA delivery systems), analyzing their efficacy, safety profiles, and potential clinical applications in current and future treatment regimens. By synthesizing findings from numerous experimental and clinical studies, we aim to address the existing research gap regarding the precise specific regulatory mechanisms of STAT3 and its translational therapeutic implications in psoriasis, providing a foundation for the development of more effective and personalized therapeutic interventions for this condition.
