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Prompt meningeal reconstruction mediated by oxygen-sensitive AKAP12 scaffolding protein after central nervous system injury.


ABSTRACT: The meninges forms a critical epithelial barrier, which protects the central nervous system (CNS), and therefore its prompt reconstruction after CNS injury is essential for reducing neuronal damage. Meningeal cells migrate into the lesion site after undergoing an epithelial-mesenchymal transition (EMT) and repair the impaired meninges. However, the molecular mechanisms of meningeal EMT remain largely undefined. Here we show that TGF-?1 and retinoic acid (RA) released from the meninges, together with oxygen tension, could constitute the mechanism for rapid meningeal reconstruction. AKAP12 is an effector of this mechanism, and its expression in meningeal cells is regulated by integrated upstream signals composed of TGF-?1, RA and oxygen tension. Functionally, AKAP12 modulates meningeal EMT by regulating the TGF-?1-non-Smad-SNAI1 signalling pathway. Collectively, TGF-?1, RA and oxygen tension can modulate the dynamic change in AKAP12 expression, causing prompt meningeal reconstruction after CNS injury by regulating the transition between the epithelial and mesenchymal states of meningeal cells.

SUBMITTER: Cha JH 

PROVIDER: S-EPMC4348065 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature

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Prompt meningeal reconstruction mediated by oxygen-sensitive AKAP12 scaffolding protein after central nervous system injury.

Cha Jong-Ho JH   Wee Hee-Jun HJ   Seo Ji Hae JH   Ahn Bum Ju BJ   Park Ji-Hyeon JH   Yang Jun-Mo JM   Lee Sae-Won SW   Lee Ok-Hee OH   Lee Hyo-Jong HJ   Gelman Irwin H IH   Arai Ken K   Lo Eng H EH   Kim Kyu-Won KW  

Nature communications 20140917


The meninges forms a critical epithelial barrier, which protects the central nervous system (CNS), and therefore its prompt reconstruction after CNS injury is essential for reducing neuronal damage. Meningeal cells migrate into the lesion site after undergoing an epithelial-mesenchymal transition (EMT) and repair the impaired meninges. However, the molecular mechanisms of meningeal EMT remain largely undefined. Here we show that TGF-β1 and retinoic acid (RA) released from the meninges, together  ...[more]

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