期刊
JOURNAL OF CELL SCIENCE
卷 121, 期 22, 页码 3717-3728出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.034082
关键词
P2X7; Brilliant Blue G; Axonal growth; Axonal branching; CaMKII; FAK; GSK3
类别
资金
- Centro de Investigacion Biomedica en Red de Enfermedades Neurodegenerativas (CIBERNED)
- Ministerio de Educacion y Ciencia [SAF2006-00906, BFU2005-02079]
- Comunidad Autonoma de Madrid [SAL/0551/2004]
- Fundacion 'La Caixa' [BM05-114-0]
- Fundacion Marcelino Botin
During the establishment of neural circuits, the axons of neurons grow towards their target regions in response to both positive and negative stimuli. Because recent reports show that Ca2+ transients in growth cones negatively regulate axonal growth, we studied how ionotropic ATP receptors (P2X) might participate in this process. Our results show that exposing cultured hippocampal neurons to ATP induces Ca2+ transients in the distal domain of the axon and the concomitant inhibition of axonal growth. This effect is mediated by the P2X7 receptor, which is present in the growth cone of the axon. Pharmacological inhibition of P2X7 or its silencing by shRNA interference induces longer and more-branched axons, coupled with morphological changes to the growth cone. Our data suggest that these morphological changes are induced by a signalling cascade in which CaMKII and FAK activity activates PI3-kinase and modifies the activity of its downstream targets. Thus, in the absence or inactivation of P2X7 receptor, axons grow more rapidly and form more branches in cultured hippocampal neurons, indicative that ATP exerts a negative influence on axonal growth. These data suggest that P2X7 antagonists have therapeutic potential to promote axonal regeneration.
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