{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nS100A6 is a small EF‐hand calcium‐binding protein that undergoes dramatic conformational changes upon Ca²⁺ binding, thereby exposing target‐interaction sites and functioning as a versatile Ca²⁺ sensor. Its three‐dimensional structure has been elucidated at high resolution, and studies have revealed that its expression can be regulated epigenetically in a tissue‐specific manner. Moreover, S100A6 is not only retained intracellularly to mediate processes such as cytoskeletal dynamics and differentiation but it may also be secreted to act via receptors like RAGE and integrin β₁."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn numerous cellular and disease models, S100A6 plays multifaceted roles in the regulation of cell proliferation, apoptosis, and cell cycle progression. In several cancers—including osteosarcoma, gastric, hepatocellular, lung, and nasopharyngeal carcinomas—altered S100A6 expression has been linked with either enhanced or suppressed tumor aggressiveness. For example, high S100A6 levels have been shown to correlate with increased proliferative signaling, activation of pathways such as PI3K/AKT and p38/MAPK, and modulation of apoptosis (including via p53‐dependent mechanisms), while in certain osteosarcomas its expression appears to suppress metastasis by promoting cell adhesion. S100A6 also influences endothelial cell cycle progression and contributes to the cellular response to extracellular stress as seen in osteoblasts and cardiomyocytes."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "16"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAt the molecular level, S100A6 exerts its effects through specific protein–protein interactions that modulate key signaling and regulatory pathways. It interacts directly with several target proteins—including the tumor suppressor p53 (with a preference for its tetrameric form), the receptor for advanced glycation end products (RAGE) via distinct extracellular domains, and components of ubiquitin ligase complexes such as CacyBP/SIP—as well as with chaperone-related TPR proteins like Sgt1 and Hop. These interactions can alter posttranslational modifications (for example, impeding casein kinase II–mediated phosphorylation) and reorganize multi‐protein complexes, thereby fine‐tuning downstream transcriptional activity and cell fate decision processes. Small molecules such as tranilast have even been shown to modulate S100A6 binding, further influencing its interaction with receptors and partners like lysozyme and RAGE."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "17", "end_ref": "26"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFinally, due to its differential expression and multifaceted involvement in key regulatory networks, S100A6 has emerged as a promising diagnostic and prognostic biomarker as well as a potential therapeutic target in several human malignancies and pathologies. Elevated tissue and serum levels of S100A6 have been reported in colorectal, pancreatic, and non‐small cell lung cancers, among others, and its expression patterns are being exploited to distinguish neoplastic from non‐neoplastic lesions and to predict clinical outcomes. Its diagnostic value is further underscored by its immunohistochemical utility in tumors such as cellular neurothekeoma and cutaneous lesions."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "27", "end_ref": "33"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ludovic R Otterbein, Jolanta Kordowska, Carlos Witte-Hoffmann, et al. 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