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• W2023341206 abstract "Rab3B is a monomeric GTPase that modulates norepinephrine secretion when expressed in PC12 neuroendocrine cells. In the present study we determined whether rab3B also regulates the organization of intercellular junctions, since this GTPase localizes to regions of cell contact in multiple cell types. The stable expression of rab3B, but not the closely related rab3A, led to two morphological phenotypes in PC12 cells: (i) reorganization of F-actin into long filopodia and (ii) redistribution of the junction-associated protein ZO-1. ZO-1 localization was not appreciably affected by the expression of a GTP binding mutant of rab3B (N135I) that stimulates norepinephrine secretion by PC12 cells. The apparent diversity of these rab3B phenotypes implies that this GTPase is capable of influencing cell signaling pathways that in turn modulate the cytoskeleton and junction organization. In support of this hypothesis we observed that rab3B expression also altered the profile of proteins that interact with the signaling molecule, phosphatidylinositol 3-kinase (PI3-kinase). The effect of rab3B on protein interactions with PI3-kinase was reversed by inhibitors of this kinase. Furthermore, PI3-kinase inhibitors virtually abolished ZO-1 localization at the surfaces of cells that express rab3B, but not rab3A, whereas these inhibitors had no effect on rab3B-dependent norepinephrine secretion. Our results indicate that rab3B can influence junctional protein targeting and secretion by distinct mechanisms." @default.
• W2023341206 created "2016-06-24" @default.
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• W2023341206 date "2000-05-01" @default.
• W2023341206 modified "2023-09-25" @default.
• W2023341206 title "Rab3B Regulates ZO-1 Targeting and Actin Organization in PC12 Neuroendocrine Cells" @default.
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• W2023341206 doi "https://doi.org/10.1006/excr.2000.4855" @default.
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