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• W2957928248 abstract "Abstract NM23 (NME) is a metastasis suppressor that significantly reduces metastasis without affecting primary tumor size, however, the precise molecular mechanisms are not completely understood. We examined the role of dynamin (DNM2), a GTPase regulating membrane scission of vesicles in endocytosis, in NME1 and NME2 regulation of tumor cell motility and metastasis. Overexpression of NMEs in MDA-MB-231T and MDA-MB-435 cancer cell lines increased endocytosis of transferrin and EGF receptors (TfR and EGFR) concurrent with motility and migration suppression. The internalized vesicles, costained with Rab5, had AP2 depleted from the cell surface and exhibited increased Rab5-GTP levels, consistent with endocytosis. Dynamin inhibitors Iminodyn-22 and Dynole-34-2, or shRNA-mediated downregulation of DNM2, impaired NME's ability to augment endocytosis or suppress tumor cell motility. In a lung metastasis assay, NME1 overexpression failed to significantly suppress metastasis in the DNM2 knockdown MDA-MB-231T cells. Using the EGF–EGFR signaling axis as a model in MDA-MB-231T cells, NME1 decreased pEGFR and pAkt expression in a DNM2-dependent manner, indicating the relevance of this interaction for downstream signaling. NME–DNM2 interaction was confirmed in two-way coimmunoprecipitations. Transfection of a NME1 site–directed mutant lacking histidine protein kinase activity but retaining nucleoside diphosphate kinase (NDPK) activity showed that the NDPK activity of NME was insufficient to promote endocytosis or inhibit EGFR signaling. We show that addition of NME1 or NME2 to DNM2 facilitates DNM2 oligomerization and increases GTPase activity, both required for vesicle scission. NME–DNM2 interaction may contribute to metastasis suppression by altering tumor endocytic and motility phenotypes. Significance: NME1 suppresses metastasis via changes in tumor endocytosis and motility, mediated by dynamin (DNM2) GTPase activity." @default.
• W2957928248 created "2019-07-23" @default.
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• W2957928248 date "2019-09-13" @default.
• W2957928248 modified "2023-10-15" @default.
• W2957928248 title "Metastasis Suppressors NME1 and NME2 Promote Dynamin 2 Oligomerization and Regulate Tumor Cell Endocytosis, Motility, and Metastasis" @default.
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• W2957928248 doi "https://doi.org/10.1158/0008-5472.can-19-0492" @default.
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