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Endogenous GFAP positive neural stem/progenitor cells in the postnatal mouse cortex are activated following Traumatic Brain Injury

Ahmed, Aminul Islam, Shtaya, Anan B., Zaben, Malik J., Owens, Emma V., Kiecker, Clemens and Gray, William P. (2011) Endogenous GFAP positive neural stem/progenitor cells in the postnatal mouse cortex are activated following Traumatic Brain Injury Journal of Neurotrauma (doi:10.1089/neu.2011.1923). (PMID:21895532).

Record type: Article


Interest to promote regeneration of the injured nervous system has recently turned towards the use of endogenous stem cells. Elucidating cues involved in driving these precursor cells out of quiescence following injury and the signals that drive them towards neuronal and glial fates will help to harness these cells for repair. Using a biomechanically validated in vitro organotypic stretch injury model, cortico-hippocampal slices from postnatal mice were cultured and a stretch injury equivalent to a severe traumatic brain injury (TBI) applied. In uninjured cortex, proliferative potential under in vitro conditions is virtually absent in older slices (equivalent postnatal day 15 compared to 8). However, following a severe stretch injury, this potential is restored in injured outer-cortex. Using slices from mice expressing a fluorescent reporter on the human Glial Fibrillary Acidic Protein (GFAP) promoter, we show that GFAP+ cells account for the majority of proliferating neurospheres formed, and that these cells are likely to arise from the cortical parenchyma and not from the subventricular zone. Moreover, we provide evidence for a correlation between upregulation of Sonic Hedgehog signaling, a pathway known to regulate stem cell proliferation, and this restoration of regenerative potential following TBI. Our results indicate that a source of quiescent endogenous stem cells residing in the cortex and subcortical tissue, proliferate in vitro following Traumatic Brain Injury (TBI). Moreover, these proliferating cells are multipotent and are derived mostly from GFAP expressing cells. This raises the possibility of utilising this endogenous source of stem cells for repair following TBI.

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e-pub ahead of print date: 6 September 2011
Organisations: Faculty of Medicine


Local EPrints ID: 201871
ISSN: 0897-7151
PURE UUID: 9612c56b-e1a6-49bc-a66c-dc2b181229e7

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Date deposited: 02 Nov 2011 11:21
Last modified: 18 Jul 2017 11:11

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Author: Aminul Islam Ahmed
Author: Anan B. Shtaya
Author: Malik J. Zaben
Author: Emma V. Owens
Author: Clemens Kiecker
Author: William P. Gray

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