Abstract：
:Mammalian sterile 20-like kinase-3b (Mst3b, encoded by Stk24), regulates axon outgrowth in embryonic cortical neurons in culture, but its role in vivo and in neural repair is unknown. Here we show that Mst3b mediates the axon-promoting effects of trophic factors in mature rat retinal ganglion cells (RGCs) and dorsal root ganglion (DRG) neurons, and is essential for axon regeneration in vivo. Reducing Mst3b levels using short hairpin RNA prevented RGCs and DRG neurons from regenerating axons in response to growth factors in culture, as did expression of a kinase-dead Mst3b mutant. Conversely, expression of constitutively active Mst3b enabled both types of neurons to extend axons without growth factors. In vivo, RGCs lacking Mst3b failed to regenerate injured axons when stimulated by intraocular inflammation. DRG neurons regenerating axons in vivo showed elevated Mst3b activity, and reducing Mst3b expression attenuated regeneration and p42/44 MAPK activation. Thus, Mst3b regulates axon regeneration in both CNS and PNS neurons.
journal_name
Nat Neuroscijournal_title
Nature neuroscienceauthors
Lorber B,Howe ML,Benowitz LI,Irwin Ndoi
10.1038/nn.2414subject
Has Abstractpub_date
2009-11-01 00:00:00pages
1407-14issue
11eissn
1097-6256issn
1546-1726pii
nn.2414journal_volume
12pub_type
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