Impaired synaptic vesicle recycling contributes to presynaptic dysfunction in lipoprotein lipase-deficient mice

X. Liu, B. Zhang, H. Yang, H. Wang, Y. Liu, A. Huang, T. Liu, X. Tian, Y. Tong, T. Zhou, T. Zhang, G. Xing, W. Xiao, X. Guo, D. Fan, X. Han, G. Liu, Z. Zhou, D. Chui

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Lipoprotein lipase (LPL) is expressed at high levels in hippocampal neurons, although its function is unclear. We previously reported that LPL-deficient mice have learning and memory impairment and fewer synaptic vesicles in hippocampal neurons, but properties of synaptic activity in LPL-deficient neurons remain unexplored. In this study, we found reduced frequency of miniature excitatory postsynaptic currents (mEPSCs) and readily releasable pool (RRP) size in LPL-deficient neurons, which led to presynaptic dysfunction and plasticity impairment without altering postsynaptic activity. We demonstrated that synaptic vesicle recycling, which is known to play an important role in maintaining the RRP size in active synapses, is impaired in LPL-deficient neurons. Moreover, lipid assay revealed deficient docosahexaenoic acid (DHA) and arachidonic acid (AA) in the hippocampus of LPL-deficient mice; exogenous DHA or AA supplement partially restored synaptic vesicle recycling capability. These results suggest that impaired synaptic vesicle recycling results from deficient DHA and AA and contributes to the presynaptic dysfunction and plasticity impairment in LPL-deficient neurons.

Original languageEnglish (US)
Pages (from-to)275-281
Number of pages7
JournalNeuroscience
Volume280
DOIs
StatePublished - Nov 7 2014
Externally publishedYes

Keywords

  • Lipoprotein lipase
  • Presynaptic dysfunction
  • Readily releasable pool (RRP)
  • Synaptic plasticity
  • Synaptic vesicle recycling

ASJC Scopus subject areas

  • Neuroscience(all)

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