期刊
JOURNAL OF NEUROSCIENCE
卷 29, 期 16, 页码 5183-5192出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.0420-09.2009
关键词
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资金
- National Institutes of Health-National Institute of Neurological Disorders and Stroke [NS048423]
- Western University
- Daljit and Elaine Sarkaria Chair
The transcription factor p53 suppresses tumorgenesis by regulating cell proliferation and migration. We investigated whether p53 could also control cell motility in postmitotic neurons. p53 isoforms recognized by phospho-p53-specific (at Ser-15) or mutant conformation-specific antibodies were highly and specifically expressed in axons and axonal growth cones in primary hippocampal neurons. Inhibition of p53 function by inhibitors, small interfering RNAs, or by dominant-negative forms, induced axonal growth cone collapse, whereas p53 overexpression led to larger growth cones. Furthermore, deletion of the p53 nuclear export signal blocked its axonal distribution and induced growth cone collapse. p53 inhibition-induced axonal growth cone collapse was significantly reduced by the Rho kinase (ROCK) inhibitor, Y27632 [( R)-(+)-trans-N-(4-pyridyl)-4-(1-aminoethyl)-cyclohexanecarboxamide]. Our results reveal a new function for p53 as a critical regulator of axonal growth cone behavior by suppressing ROCK activity.
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