Trophic factors attenuate nitric oxide mediated neuronal and axonal injury in vitro: roles and interactions of mitogen-activated protein kinase signalling pathways
Article first published online: 10 FEB 2005
Journal of Neurochemistry
Volume 92, Issue 6, pages 1487–1496, March 2005
How to Cite
Wilkins, A. and Compston, A. (2005), Trophic factors attenuate nitric oxide mediated neuronal and axonal injury in vitro: roles and interactions of mitogen-activated protein kinase signalling pathways. Journal of Neurochemistry, 92: 1487–1496. doi: 10.1111/j.1471-4159.2004.02981.x
- Issue published online: 17 FEB 2005
- Article first published online: 10 FEB 2005
- Received July 27, 2004; revised manuscript received November 12, 2004; accepted November 15, 2004.
- mitogen-activated protein kinase;
Inflammation in the central nervous system occurs in diseases such as multiple sclerosis and leads to axon dysfunction and destruction. Both in vitro and in vivo observations have suggested an important role for nitric oxide (NO) in mediating inflammatory axonopathy. The purposes of this study were to model inflammatory axonopathy in vitro and identify modulators of the process. Rat cortical neurones were cultured and exposed to an NO-donor plus potential protective factors. Cultures were then assessed for neuronal survival, axon survival and markers of intracellular signalling pathways. The NO-donor produced dose-dependent neuronal loss and a large degree of axon destruction. Oligodendrocyte conditioned medium (OCM) and insulin-like growth factor type-1 (IGF-1), but not glial cell line-derived neurotrophic factor (GDNF), improved survival of neurones exposed to NO donors. In addition p38 MAP kinase was activated by NO exposure and inhibition of p38 signalling led to neuronal and axonal survival effects. OCM and IGF-1 (but not GDNF) reduced p38 activation in NO-exposed cortical neurones. OCM, IGF-1 and GDNF improved axon survival in cultures exposed to NO, a process dependent on mitogen-activated protein kinase/extracellular signal-related kinase signalling. This study emphasizes that different mechanisms may underlie neuronal/axonal destructive processes, and suggests that trophic factors may modulate NO-mediated neurone/axon destruction via specific pathways.