Dendritic trafficking of brain-derived neurotrophic factor mRNA: Regulation by translin-dependent and -independent mechanisms

Yen Ching Wu, Rebecca Williamson, Zhi Li, Annalisa Vicario, Jerry Xu, Masataka Kasai, Yijuang Chern, Enrico Tongiorgi, Jay M. Baraban

Research output: Contribution to journalArticlepeer-review

Abstract

Dendritic trafficking and translation of brain-derived neurotrophic factor (BDNF) transcripts play a key role in mediating synaptic plasticity. Recently, we demonstrated that siRNA-mediated knockdown of translin, an RNA-binding protein, impairs KCl-induced dendritic trafficking of BDNF mRNA in cultured hippocampal neurons. We have now assessed whether translin deletion impairs dendritic trafficking of BDNF mRNA in hippocampal neurons in vivo. We have found that translin and its partner protein, trax, undergo dendritic translocation in response to treatment with pilocarpine, a pro-convulsant muscarinic agonist that increases dendritic trafficking of BDNF mRNA in hippocampal neurons. In translin knockout mice, the basal level of dendritic BDNF mRNA is decreased in CA1 pyramidal neurons. However, translin deletion does not block pilocarpine's ability to increase dendritic trafficking of BDNF mRNA indicating that the requirement for translin in this process varies with the stimulus employed to drive it. Consistent with this inference, we found that dendritic trafficking of BDNF mRNA induced by bath application of recombinant BDNF in cultured hippocampal neurons, is not blocked by siRNA-mediated knockdown of translin. Taken together, these in vivo and in vitro findings indicate that dendritic trafficking of BDNF mRNA can be mediated by both translin-dependent and -independent mechanisms.

Original languageEnglish (US)
Pages (from-to)1112-1121
Number of pages10
JournalJournal of Neurochemistry
Volume116
Issue number6
DOIs
StatePublished - Mar 2011

Keywords

  • CA1 pyramidal neurons
  • dendritic translation
  • hippocampus
  • pilocarpine
  • trax

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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