title: Scribble controls NGF-mediated neurite outgrowth in PC12 cells.
abstract: Neurite outgrowth is mediated by dynamic changes of the cytoskeleton and is largely controlled by Rho GTPases and their regulators. Here, we show that the polarity protein Scribble controls PC12 cell neurite outgrowth in response to nerve growth factor. Scribble knockdown decreases neurite numbers and increases neurite length. This effect is linked to TrkA the cognate receptor for NGF as pharmacological inhibition of phosphorylated TrkA (pTrkA) reduces Scribble expression. Moreover, Scribble forms a complex with the MAPK components ERK1/2 in a growth factor dependent manner. In RNAi experiments where Scribble expression is efficiently depleted sustained ERK1/2 phosphorylation is reduced. Conversely, siRNA with intermediate Scribble silencing efficiency fails to match this effect indicating that ERK1/2 activation depends on basic Scribble protein levels. Finally, Scribble translocates to the plasma membrane in response to growth factor where it complexes with HRas and Rac1 suggesting that the phenotype activated by loss of Scribble may be a result of altered GTPase activity. Together, these results demonstrate a novel role for Scribble in neurite outgrowth of PC12 cells.
authors: School of Natural Sciences, Technology and Environmental Studies, Södertörn University, Huddinge, Sweden.
authors: Michael
authors: M
authors: Wigerius
authors: Naveed
authors: N
authors: Asghar
authors: Wessam
authors: W
authors: Melik
authors: Magnus
authors: M
authors: Johansson
mesh_terms: D000818:Animals; D019556:COS Cells; D048708:Cell Growth Processes; D002462:Cell Membrane / Q000378:metabolism; D002522:Chlorocebus aethiops; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D020932:Nerve Growth Factor / Q000494:pharmacology; D016501:Neurites / Q000187:drug effects / Q000378:metabolism* / Q000502:physiology; D015513:Oncogene Proteins; D016716:PC12 Cells; D011485:Protein Binding; D021381:Protein Transport; D051381:Rats; D020917:Receptor, trkA / Q000378:metabolism; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*; D020830:rac1 GTP-Binding Protein / Q000378:metabolism; D018631:ras Proteins
chemical_list: C528429:Hras protein, rat; D015513:Oncogene Proteins; D025521:Tumor Suppressor Proteins; C548802:scribble protein, rat; D020932:Nerve Growth Factor; D020917:Receptor, trkA; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; C499134:Rac1 protein, rat; D020830:rac1 GTP-Binding Protein; D018631:ras Proteins
keywords: Cell polarity; Erk1/2; HRas; MAPK pathway; Neurite outgrowth; Scribble