Endothelium-Derived Semaphorin 3G Regulates Hippocampal Synaptic Structure and Plasticity via Neuropilin-2/PlexinA4

Chao Tan, Nan Nan Lu, Cheng Kun Wang, Dan Yang Chen, Ning He Sun, Hang Lyu, Jakob Körbelin, Wei Xing Shi, Kohji Fukunaga, Ying Mei Lu, Feng Han

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The proper interactions between blood vessels and neurons are critical for maintaining the strength of neural circuits and cognitive function. However, the precise molecular events underlying these interactions remain largely unknown. Here, we report that the selective knockout of semaphorin 3G (Sema3G) in endothelial cells impaired hippocampal-dependent memory and reduced dendritic spine density in CA1 neurons in mice; these effects were reversed after restoration of Sema3G levels in the hippocampus by AAV transfection. We further show that Sema3G increased excitatory synapse density via neuropilin-2/PlexinA4 signaling and through activation of Rac1. These results provide the first evidence that, in the central nervous system, endothelial Sema3G serves as a vascular-derived synaptic organizer that regulates synaptic plasticity and hippocampal-dependent memory. Our findings highlight the role of vascular endothelial cells in regulating cognitive function through intercellular communication with neurons in the hippocampus. Tan et al. reveal a key mechanism that underlies signaling from endothelial cells to neurons in the brain. They identify that the endothelium-secreted protein semaphorin 3G (Sema3G) regulates synaptic structure and plasticity in hippocampal neurons through its neuronal neuropilin-2/PlexinA4 holoreceptor.

Original languageEnglish
Pages (from-to)920-937.e13
JournalNeuron
Volume101
Issue number5
DOIs
Publication statusPublished - 2019 Mar 6

Keywords

  • Nrp2
  • PlexinA4
  • Semaphorin 3G
  • endothelial cell
  • hippocampus
  • neurovascular interaction
  • synaptic plasticity

ASJC Scopus subject areas

  • Neuroscience(all)

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