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Vol. 11, Issue 9, 3191-3203, September 2000

The RNA-binding Protein HuD Is Required for GAP-43 mRNA Stability, GAP-43 Gene Expression, and PKC-dependent Neurite Outgrowth in PC12 Cells

Charlotte D. Mobarak,*dagger Kim D. Anderson,* Melissa Morin,* Andrea Beckel-Mitchener,* Sherry L. Rogers,Dagger Henry Furneaux,§ Peter King,|| and Nora I. Perrone-Bizzozero*

Departments of  *Neurosciences and  Dagger Cell Biology and Physiology University of New Mexico School of Medicine, Albuquerque, New Mexico 87131; and  §Program in Molecular Pharmacology and Therapeutics, Memorial Sloan Kettering Cancer Center, New York, NY 10021; and  ||Department of Neurology, University of Alabama, Birmingham

The RNA-binding protein HuD binds to a regulatory element in the 3' untranslated region (3' UTR) of the GAP-43 mRNA. To investigate the functional significance of this interaction, we generated PC12 cell lines in which HuD levels were controlled by transfection with either antisense (pDuH) or sense (pcHuD) constructs. pDuH-transfected cells contained reduced amounts of GAP-43 protein and mRNA, and these levels remained low even after nerve growth factor (NGF) stimulation, a treatment that is normally associated with protein kinase C (PKC)-dependent stabilization of the GAP-43 mRNA and neuronal differentiation. Analysis of GAP-43 mRNA stability demonstrated that the mRNA had a shorter half-life in these cells. In agreement with their deficient GAP-43 expression, pDuH cells failed to grow neurites in the presence of NGF or phorbol esters. These cells, however, exhibited normal neurite outgrowth when exposed to dibutyryl-cAMP, an agent that induces outgrowth independently from GAP-43. We observed opposite effects in pcHuD-transfected cells. The GAP-43 mRNA was stabilized in these cells, leading to an increase in the levels of the GAP-43 mRNA and protein. pcHuD cells were also found to grow short spontaneous neurites, a process that required the presence of GAP-43. In conclusion, our results suggest that HuD plays a critical role in PKC-mediated neurite outgrowth in PC12 cells and that this protein does so primarily by promoting the stabilization of the GAP-43 mRNA.

dagger Present address: Lung Cancer Program, Lovelace Respiratory Research Institute, Albuquerque, NM 87185-5890.

Corresponding author. E-mail: NBizzozero{at}salud.unm.edu.

Molecular Biology of the Cell
Vol. 11, 3191-3203, September 2000
Copyright © 2000 by The American Society for Cell Biology


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