Neuronal cyclic AMP controls the developmental loss in ability of axons to regenerate

Dongming Cai, Jin Qiu, Zixuan Cao, Marietta McAtee, Barbara S. Bregman, Marie T. Filbin

Research output: Contribution to journalArticlepeer-review

459 Scopus citations

Abstract

Unlike neonatal axons, mammalian adult axons do not regenerate after injury. Likewise, myelin, a major factor in preventing regeneration in the adult, inhibits regeneration from older but not younger neurons. Identification of the molecular events responsible for this developmental loss of regenerative capacity is believed key to devising strategies to encourage regeneration in adults after injury. Here, we report that the endogenous levels of the cyclic nucleotide, cAMP, are dramatically higher in young neurons in which axonal growth is promoted both by myelin in general and by a specific myelin component, myelin-associated glycoprotein (MAG), than in the same types of neurons that, when older, are inhibited by myelin-MAG. Inhibiting a downstream effector of cAMP [protein kinase A (PKA)] prevents myelin-MAG promotion from young neurons, and elevating cAMP blocks myelin-MAG inhibition of neurite outgrowth in older neurons. Importantly, developmental plasticity of spinal tract axons in neonatal rat pups in vivo is dramatically reduced by inhibition of PKA. Thus, the switch from promotion to inhibition by myelin-MAG, which marks the developmental loss of regenerative capacity, is mediated by a developmentally regulated decrease in endogenous neuronal cAMP levels.

Original languageEnglish (US)
Pages (from-to)4731-4739
Number of pages9
JournalJournal of Neuroscience
Volume21
Issue number13
DOIs
StatePublished - Jul 1 2001
Externally publishedYes

Keywords

  • Axonal regeneration
  • Development
  • MAG
  • Myelin
  • Protein kinase A
  • cAMP

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