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Inhibitors of mitogen-activated protein kinases protect axotomized developing neurons
1Institut de Biologie Cellulaire et de Morphologie, Université de Lausanne, Rue du Bugnon 9, 1005, Lausanne, Switzerland. vincent.castagne@inst.hospvd.ch
Abstract:
Axotomy kills developing neurons by mechanisms dependent on protein synthesis and influenced by the redox status. Amongst the redox-regulated transduction systems regulating gene expression are the mitogen-activated protein kinases (MAPKs). In the chick embryo, inhibitors of two different MAPK pathways, including notably the p38 kinase pathway, reduce the number of dying axotomized retinal ganglion cells. The regulation of the genetic events associated to axotomy-induced death thus seems to involve MAPKs.
Insights
Axotomy-induced neuron death in developing retinal ganglion cells is regulated by protein synthesis and redox status. Mitogen-activated protein kinases (MAPKs), particularly the p38 kinase pathway, play a crucial role in this process.
Area of Science:
- Neuroscience
- Cell Biology
- Developmental Biology
Background:
- Axotomy, a surgical procedure involving nerve cutting, triggers cell death in developing neurons.
- This neuronal death is dependent on protein synthesis and influenced by the cell's redox status.
- Mitogen-activated protein kinases (MAPKs) are key signal transduction pathways involved in regulating gene expression, particularly in response to cellular stress.
Purpose of the Study:
- To investigate the role of mitogen-activated protein kinases (MAPKs) in axotomy-induced neuronal death.
- To determine if specific MAPK pathways, such as the p38 kinase pathway, are involved in the regulation of gene expression during neuronal cell death following axotomy.
Main Methods:
- Utilizing the chick embryo model system.
- Employing inhibitors targeting different MAPK pathways, including the p38 kinase pathway.
- Assessing the number of dying axotomized retinal ganglion cells.
Main Results:
- Inhibitors of certain MAPK pathways, specifically the p38 kinase pathway, were found to significantly reduce the number of dying axotomized retinal ganglion cells.
- These findings suggest a critical involvement of MAPK signaling in the cellular response to axotomy.
Conclusions:
- Mitogen-activated protein kinases (MAPKs) are implicated in the regulation of genetic events leading to axotomy-induced neuronal death.
- The p38 kinase pathway appears to be a significant mediator of this cell death process, highlighting potential therapeutic targets for neuronal survival.