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Recapitulate development to promote axonal regeneration: good or bad approach?
1Department of Biological Sciences, Hunter College, City University of New York, 695 Park Avenue, New York, NY 10021, USA. filbin@genectr.hunter.cuny.edu
Abstract:
In the past decade there has been an explosion in our understanding, at the molecular level, of why axons in the adult, mammalian central nervous system (CNS) do not spontaneously regenerate while their younger counterparts do. Now a number of inhibitors of axonal regeneration have been described, some of the receptors they interact with to transduce the inhibitory signal are known, as are some of the steps in the signal transduction pathway that is responsible for inhibition. In addition, developmental changes in the environment and in the neurons themselves are also now better understood. This knowledge in turn reveals novel, putative sites for drug development and therapeutic intervention after injury to the brain and spinal cord. The challenge now is to determine which of these putative treatments are the most effective and if they would be better applied in combination rather than alone. In this review I will summarize what we have learnt about these molecules and how they signal. Importantly, I will also describe approaches that have been shown to block inhibitors and encourage regeneration in vivo. I will also speculate on what the differences are between the neonatal and adult CNS that allow the former to regenerate and the latter not to.
Insights
Adult mammalian central nervous system (CNS) axons fail to regenerate due to molecular inhibitors. Understanding these inhibitors and developmental changes offers therapeutic targets for CNS injury and regeneration.
Area of Science:
- Neuroscience
- Molecular Biology
- Regenerative Medicine
Background:
- Axon regeneration differs significantly between neonatal and adult mammalian central nervous system (CNS).
- Recent advances have elucidated molecular mechanisms underlying the failure of adult CNS axon regeneration.
Purpose of the Study:
- To review molecular inhibitors of adult CNS axon regeneration.
- To discuss signaling pathways and developmental changes impacting regeneration.
- To explore therapeutic strategies for promoting CNS repair.
Main Methods:
- Literature review of molecular mechanisms of axonal growth inhibition.
- Analysis of developmental differences between neonatal and adult CNS.
- Evaluation of therapeutic interventions targeting regeneration inhibitors.
Main Results:
- Identification of specific molecular inhibitors and their receptors in the adult CNS.
- Understanding of signal transduction pathways responsible for regeneration blockade.
- Insights into developmental plasticity that permits regeneration in younger CNS.
Conclusions:
- Knowledge of inhibitory molecules and pathways provides novel targets for drug development.
- Further research is needed to determine optimal therapeutic combinations for CNS injury.
- Understanding developmental differences is key to unlocking regenerative potential in the adult CNS.
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