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Depolarization-induced differentiation of PC12 cells is mediated by phospholipase D2 through the transcription factor CREB pathway.

Authors: Banno, Y  Nemoto, S  Murakami, M  Kimura, M  Ueno, Y  Ohguchi, K  Hara, A  Okano, Y  Kitade, Y  Onozuka, M  Murate, T  Nozawa, Y 
Citation: Banno Y, etal., J Neurochem. 2008 Mar;104(5):1372-86. Epub 2007 Nov 14.
Pubmed: (View Article at PubMed) PMID:18004999
DOI: Full-text: DOI:10.1111/j.1471-4159.2007.05085.x

The present study examined the role of phospholipase D2 (PLD2) in the regulation of depolarization-induced neurite outgrowth and the expression of growth-associated protein-43 (GAP-43) and synapsin I in rat pheochromocytoma (PC12) cells. Depolarization of PC12 cells with 50 mmol/L KCl increased neurite outgrowth and elevated mRNA and protein expression of GAP-43 and synapsin I. These increases were suppressed by inhibition of Ca2+-calmodulin-dependent protein kinase II (CaMKII), PLD, or mitogen-activated protein kinase kinase (MEK). Knockdown of PLD2 by small interfering RNA (siRNA) suppressed the depolarization-induced neurite outgrowth, and the increase in GAP-43 and synapsin I expression. Depolarization evoked a Ca2+ rise that activated various signaling enzymes and the cAMP response element-binding protein (CREB). Silencing CaMKIIdelta by siRNA blocked KCl-induced phosphorylation of proline-rich protein tyrosine kinase 2 (Pyk2), Src kinase, and extracellular signal-regulated kinase (ERK). Inhibition of Src or MEK abolished phosphorylation of ERK and CREB. Furthermore, phosphorylation of Pyk2, ERK, and CREB was suppressed by the PLD inhibitor, 1-butanol and transfection of PLD2 siRNA, whereas it was enhanced by over-expression of wild-type PLD2. Depolarization-induced PLD2 activation was suppressed by CaMKII and Src inhibitors, but not by MEK or protein kinase A inhibitors. These results suggest that the signaling pathway of depolarization-induced PLD2 activation was downstream of CaMKIIdelta and Src, and upstream of Pyk2(Y881) and ERK/CREB, but independent of the protein kinase A. This is the first demonstration that PLD2 activation is involved in GAP-43 and synapsin I expression during depolarization-induced neuronal differentiation in PC12 cells.

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CRRD Object Information
CRRD ID: 2299900
Created: 2008-08-20
Species: All species
Last Modified: 2008-08-20
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.