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Journal article
Dynamic Changes in Local Protein Synthetic Machinery in Regenerating Central Nervous System Axons after Spinal Cord Injury
Neural plasticity, v 2016, 4087254
2016
PMID: 27375904
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Intra-axonal localization of mRNAs and protein synthesis machinery (PSM) endows neurons with the capacity to generate proteins locally, allowing precise spatiotemporal regulation of the axonal response to extracellular stimuli. A number of studies suggest that this local translation is a promising target to enhance the regenerative capacity of damaged axons. Using a model of central nervous system (CNS) axons regenerating into intraspinal peripheral nerve grafts (PNGs) we established that adult regenerating CNS axons contain several different mRNAs and protein synthetic machinery (PSM) components in vivo. After lower thoracic level spinal cord transection, ascending sensory axons regenerate into intraspinal PNGs but axon growth is stalled when they reach the distal end of the PNG (3 versus 7 weeks after grafting, resp.). By immunofluorescence with optical sectioning of axons by confocal microscopy, the total and phosphorylated forms of PSMs are significantly lower in stalled compared with actively regenerating axons. Reinjury of these stalled axons increased axonal localization of the PSM proteins, indicative of possible priming for a subcellular response to axotomy. These results suggest that axons downregulate protein synthetic capacity as they cease growing, yet they retain the ability to upregulate PSM after a second injury.
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Details
- Title
- Dynamic Changes in Local Protein Synthetic Machinery in Regenerating Central Nervous System Axons after Spinal Cord Injury
- Creators
- Rahul Sachdeva - Drexel UniversityKaitlin Farrell - Drexel UniversityMary-Katharine McMullen - Drexel UniversityJeffery L Twiss - University of South CarolinaJohn D Houle - Drexel University
- Publication Details
- Neural plasticity, v 2016, 4087254
- Publisher
- Wiley
- Grant note
- R01 NS041596 / NINDS NIH HHS P01 NS055976 / NINDS NIH HHS
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Neurobiology and Anatomy
- Web of Science ID
- WOS:000378292800001
- Scopus ID
- 2-s2.0-84976407139
- Other Identifier
- 991019168158804721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Neurosciences