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The disintegrin/metalloproteinase ADAM10 is essential for the establishment of the brain cortex.

http://www.ncbi.nlm.nih.gov/pubmed/20371803

The metalloproteinase and major amyloid precursor protein (APP) alpha-secretase candidate ADAM10 is responsible for the shedding of proteins important for brain development, such as cadherins, ephrins, and Notch receptors. Adam10(-/-) mice die at embryonic day 9.5, due to major defects in development of somites and vasculogenesis. To investigate the function of ADAM10 in brain, we generated Adam10 conditional knock-out (cKO) mice using a Nestin-Cre promotor, limiting ADAM10 inactivation to neural progenitor cells (NPCs) and NPC-derived neurons and glial cells. The cKO mice die perinatally with a disrupted neocortex and a severely reduced ganglionic eminence, due to precocious neuronal differentiation resulting in an early depletion of progenitor cells. Premature neuronal differentiation is associated with aberrant neuronal migration and a disorganized laminar architecture in the neocortex. Neurospheres derived from Adam10 cKO mice have a disrupted sphere organization and segregated more neurons at the expense of astrocytes. We found that Notch-1 processing was affected, leading to downregulation of several Notch-regulated genes in Adam10 cKO brains, in accordance with the central role of ADAM10 in this signaling pathway and explaining the neurogenic phenotype. Finally, we found that alpha-secretase-mediated processing of APP was largely reduced in these neurons, demonstrating that ADAM10 represents the most important APP alpha-secretase in brain. Our study reveals that ADAM10 plays a central role in the developing brain by controlling mainly Notch-dependent pathways but likely also by reducing surface shedding of other neuronal membrane proteins including APP.

Pubmed ID: 20371803 RIS Download

Mesh terms: ADAM Proteins | Amyloid Precursor Protein Secretases | Amyloid beta-Protein Precursor | Animals | Animals, Newborn | Cell Differentiation | Cell Proliferation | Cells, Cultured | Cerebral Cortex | Female | Membrane Proteins | Mice | Mice, Inbred C57BL | Mice, Knockout | Mice, Transgenic | Neurogenesis | Pregnancy | Receptors, Notch

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Associated grants

  • Agency: NEI NIH HHS, Id: EY015719
  • Agency: NIGMS NIH HHS, Id: GM64750
  • Agency: NEI NIH HHS, Id: R01 EY015719
  • Agency: NEI NIH HHS, Id: R01 EY015719-06
  • Agency: NIGMS NIH HHS, Id: R01 GM064750
  • Agency: NIGMS NIH HHS, Id: R01 GM064750-09
  • Agency: NIGMS NIH HHS, Id: R01 GM064750-09S1

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