Syndecan-1: a key player in health and disease

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Abstract
Syndecan-1 (SDC-1) is a transmembrane protein localized on the basolateral surface of epithelial cells, encompassing a core protein with heparin sulfate and chondroitin sulfate glycosaminoglycan side chains. SDC-1 is involved in a panoply of cellular mechanisms including cell-to-cell adhesion, extracellular matrix interactions, cell cycle modulation, and lipid clearance. Alterations in the expression and function of SDC-1 are implicated in numerous disease entities, making it an attractive diagnostic and therapeutic target. However, despite its broad involvement in several disease processes, the underlying mechanism contributing to its diverse functions, pathogenesis, and therapeutic uses remains underexplored. Therefore, this review examines the role of SDC-1 in health and disease, focusing on liver pathologies, inflammatory diseases, infectious diseases, and cancer, and sheds light on SDC-1-based therapeutic approaches. Moreover, it delves into the mechanisms through which SDC-1 contributes to these diseases, emphasizing cell-type specific mechanisms. By comprehensively summarizing the significance of SDC-1, its association with several diseases, and its underlying mechanisms of action, the findings of this review could inform future research directions toward the development of targeted therapies and early diagnosis for a multitude of disease entities.

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