Journal
JOURNAL OF NEUROTRAUMA
Volume 30, Issue 12, Pages 1053-1061Publisher
MARY ANN LIEBERT INC
DOI: 10.1089/neu.2012.2693
Keywords
astrocyte; cdc2; implantation; SCI
Funding
- Basic Science Research Program through the National Research Foundation (NRF)
- Ministry of Education, Science and Technology, Korea [2010-0023869]
- National Research Foundation of Korea [2010-0023869] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Migrating activity of reactive astrocytes induced after spinal cord injury (SCI) controls glial scar formation by limiting inflammatory responses around the injury area, and, therefore, can be beneficial for regenerative responses of spinal axons. Recently, we found that cell division cycle 2 (cdc2) activity in primary astrocytes facilitated neurite outgrowth of co-cultured neurons. Here, we investigated the effects of cdc2 activity on regenerative processes in vivo after SCI. Administration of the cdc2 inhibitor purvalanol A restricted compaction of the injury cavity and astrocyte infiltration into the cavity. After SCI, regenerative responses of anterogradely labeled corticospinal tract (CST) axons were attenuated by purvalanol A treatment. Using the polymeric tube that was implanted into the spinal cord as a nerve guide conduit, we found that purvalanol A treatments reduced astrocyte migration into the tube graft and, in parallel, retarded the extension of spinal axons into the tube. These results suggest that astrocytes with cdc2 activity may play a permissive role in mediating regrowth of spinal axons after lesion.
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