{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n ARHGAP25, a Rac‐specific GTPase‐activating protein predominantly expressed in hematopoietic cells, plays a critical role in modulating Rac1 activity and downstream actin cytoskeletal dynamics. Functional studies indicate that by accelerating GTP hydrolysis on Rac1, ARHGAP25 limits protrusive activity and cell spreading, thereby controlling cell migration, invasion, and phagocytic responses. In cancer models, diminished ARHGAP25 expression has been linked to enhanced colorectal tumor cell proliferation, invasion, and metastasis—with restoration of its expression resulting in suppression of the Wnt/β‐catenin pathway and improved overall prognosis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": " Similarly, in pancreatic adenocarcinoma, ARHGAP25 overexpression inhibits cell growth by inactivating AKT/mTOR signaling via Rac1/PAK1 modulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " In the immune system, ARHGAP25 functions as a negative regulator of leukocyte transendothelial migration"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "and is important for B‐cell development in a CXCR4‐dependent manner"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": ", while its phosphorylation at specific residues modulates hematopoietic stem and progenitor cell mobilization."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " Conversely, in alveolar rhabdomyosarcoma, upregulation of ARHGAP25 supports tumor cell invasion by curbing Rac activity downstream of ROCK."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " Moreover, differential DNA methylation of the ARHGAP25 gene has been observed in contexts ranging from placental tissues to peripheral blood, suggesting potential utility as an epigenetic biomarker in non‐invasive prenatal diagnostics."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Collectively, these studies underscore the multifaceted role of ARHGAP25 as a key negative regulator of Rac1‐dependent processes with significant implications for tumor suppression, immune cell function, and developmental as well as diagnostic applications.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Li Tao, Yingjie Zhu, Ying Gu, et al. 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