Journal
DEVELOPMENTAL BIOLOGY
Volume 327, Issue 1, Pages 158-168Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ydbio.2008.12.006
Keywords
Neuronal migration; Cortical development; Laminin; Neurite growth; Paxillin; FAK; AKT; GSK-3 beta
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Funding
- NIH [NS035704, NS038472, NS050537]
- Dr. Miriam and Sheldon G. Adelson Medical Research Foundation
- Muscular Dystrophy Association [MDA4066]
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Laminins have dramatic and varied actions on neurons in vitro. However, their in vivo function in brain development is not clear. Here we show that knockout of laminin gamma 1 in the cerebral cortex leads to defects in neuritogenesis and neuronal migration. In the mutant mice, cortical layer structures were disrupted, and axonal pathfinding was impaired. During development, loss of laminin expression impaired phosphorylation of FAK and paxillin, indicating defects in integrin signaling pathways. Moreover, both phosphorylation and protein levels of GSK-3 beta were significantly decreased, but only phosphorylation of AKT was affected in the mutant cortex. Knockout of laminin gamma 1 expression in vitro, dramatically inhibited neurite growth. These results indicate that laminin regulates neurite growth and neuronal migration via integrin signaling through the AKT/GSK-3 beta pathway, and thus reveal a novel mechanism of laminin function in brain development. (C) 2009 Elsevier Inc. All rights reserved.
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