{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nWASF2 (also known as WAVE2) is a central regulator of actin cytoskeletal reorganization that translates signals from small GTPases such as Rac into spatially restricted actin nucleation at the cell membrane. It is incorporated into multiprotein complexes—with essential partners like Abi1, Nap1, and PIR121—that in its native state remains basally inactive until triggered by coordinated inputs including Rac‐GTP, acidic phospholipids (e.g. PtdIns(3,4,5)P₃), and key phosphorylation events mediated by kinases (e.g. ERK). These events induce allosteric changes that activate the Arp2/3 complex, leading to lamellipodia protrusion formation and directional cell migration."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "11"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its core role in promoting actin nucleation, WASF2 is pivotal for diverse cellular processes. It underpins the formation and maintenance of cell–cell contacts and junctional tension in epithelial tissues, modulates integrin clustering and affinity at the immunological synapse in T cells, and regulates natural killer cell cytotoxicity. Pathogens such as Chlamydia and HIV subvert WASF2‐mediated actin remodeling to promote host cell invasion. Moreover, aberrant WASF2 expression and activity have been linked to enhanced migration, invasion, and metastasis in several cancers—including colorectal, lung, hepatocellular, and breast carcinomas—often through its impact on integrin activation and adhesion dynamics."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "12", "end_ref": "25"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nThe activity and localization of WASF2 are finely tuned by an array of interacting partners and post‐translational modifications. Kinases such as Abl, Pak1, and ERK phosphorylate WASF2 on key tyrosine and serine residues to promote its recruitment to the leading edge and to enhance its ability to stimulate Arp2/3‐mediated actin polymerization. Furthermore, WASF2 engages with adaptor and scaffolding proteins—including IRSp53, myosin IIA, βPIX, GIT1, and even serves as an A-kinase anchoring protein for PKA—to facilitate its intracellular transport along microtubules and its dynamic assembly into motility‐promoting complexes. Such regulation ensures that actin remodeling occurs with the proper spatial and temporal precision needed for effective cell migration and membrane protrusion."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "26", "end_ref": "36"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nNotably, dysregulation of WASF2 has emerged as a key factor in the oncogenic process. Elevated or aberrantly modulated WASF2 expression has been correlated with increased tumor cell motility, invasion, metastasis, and even therapeutic resistance in a range of malignancies such as gastric, pancreatic, cervical, and triple‐negative breast cancers, as well as gliomas and lung cancers. In several settings, microRNAs (for example, miR‐146a, miR‐29, and miR‐1253) regulate WASF2 levels, thereby impacting downstream signaling cascades that govern integrin activity, actin assembly, and invasive behavior. These findings support a model in which the miRNA–WASF2 axis represents a promising prognostic marker and potential therapeutic target in tumor progression and metastatic dissemination."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "37", "end_ref": "48"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Metello Innocenti, Adriana Zucconi, Andrea Disanza, et al. 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