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There are currently no effective treatments for moderate-to-severe traumatic brain injuries (TBIs). The paracrine functions of undifferentiated neural stem cells (NSCs) are believed to play a significant role in stimulating the repair and regeneration of injured brain tissue. We therefore hypothesized that fibroblast growth factor (FGF2) enriching chondroitin sulfate glycosaminoglycan (CS-GAG) matrices can maintain the undifferentiated state of neural stem cells (NSCs) and facilitate brain tissue repair subacutely post-TBI. Rats subjected to a controlled cortical impactor (CCI) induced TBI were intraparenchymally injected with CS-GAG matrices alone or with CS-GAG matrices containing PKH26GL labeled allogeneic NSCs. Nissl staining of brain tissue 4 weeks post-TBI demonstrated the significantly enhanced ( p &lt; 0.05) tissue protection in CS-GAG treated animals when compared to TBI only control, and NSC only treated animals. CS-GAG-NSC treated animals demonstrated significantly enhanced ( p &lt; 0.05) FGF2 retention, and maintenance of PKH26GL labeled NSCs as indicated by enhanced Sox1+ and Ki67+ cell presence over other differentiated cell types. Lastly, all treatment groups and sham controls exhibited a significantly ( p &lt; 0.05) attenuated GFAP+ reactive astrocyte presence in the lesion site when compared to TBI only controls.

Chondroitin Sulfate Glycosaminoglycan Matrices Promote Neural Stem Cell Maintenance and Neuroprotection Post-Traumatic Brain Injury