Abstract:
:Inhibitors in myelin play a major role in preventing spontaneous axonal regeneration after CNS injury. Elevation of cAMP overcomes this inhibition, in a transcription-dependent manner, through the upregulation of Arginase I (Arg I) and increased synthesis of polyamines. Here, we show that the cAMP effect requires activation of the transcription factor cAMP response element binding protein (CREB) to overcome myelin inhibitors; a dominant-negative CREB abolishes the effect, and neurons expressing a constitutively active form of CREB are not inhibited. Activation of CREB is also required for cAMP to upregulate Arg I, and the ability of constitutively active CREB to overcome inhibition is blocked by an inhibitor of polyamine synthesis. Finally, expression of constitutively active CREB in DRG neurons is sufficient to promote regeneration of subsequently lesioned dorsal column axons. These results indicate that CREB plays a central role in overcoming myelin inhibitors and so encourages regeneration in vivo.
journal_name
Neuronjournal_title
Neuronauthors
Gao Y,Deng K,Hou J,Bryson JB,Barco A,Nikulina E,Spencer T,Mellado W,Kandel ER,Filbin MTdoi
10.1016/j.neuron.2004.10.030subject
Has Abstractpub_date
2004-11-18 00:00:00pages
609-21issue
4eissn
0896-6273issn
1097-4199pii
S0896627304006919journal_volume
44pub_type
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