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The aryl hydrocarbon receptor pathway defines the time frame for restorative neurogenesis

ABSTRACT: In contrast to mammals, zebrafish has high capacity to regenerate tissue architecture and replace lost neurons after traumatic brain injury. The ependymoglia cells react to the injury and generate new neurons, which migrate to the lessoned site and contribute to the tissue restoration. Understanding molecular and cellular mechanisms underlying this regenerative neurogenesis is the crucial step towards achieving regenerative therapies in the mammalian brain. In order to identify molecular pathways governing this mode of restorative neurogenesis, we analysed changes in the transcriptome of ependymoglia cells and their progeny during regeneration process and identified Aryl hydrocarbon receptor (AhR) to be involved in regulation of ependymoglia differentiation towards post-mitotic neurons. Our in vivo imaging analysis shows that the high AhR signalling promotes direct conversion of newly identified population of ependymoglia into the post-mitotic neurons. In contrast, decrease in AhR signalling promotes ependymoglial proliferation. Interestingly, we observed inactivation of the AhR signalling shortly after the injury and return to the basal levels 7 days post injury (dpi) suggesting the role of AhR in proper timing of the direct conversion of ependymoglia, ensuring the successful repair. Taken together, we identified the role of AhR signalling pathway in regulating differentiation of ependymoglia into the neurons and setting up the proper timing of restorative neurogenesis in zebrafish brain.

ORGANISM(S): Danio rerio

PROVIDER: GSE102400 | GEO | 2018/10/11

REPOSITORIES: GEO

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