Psychopharmacology

, Volume 235, Issue 1, pp 337–349 | Cite as

Xanthoceraside modulates NR2B-containing NMDA receptors at synapses and rescues learning-memory deficits in APP/PS1 transgenic mice

  • Lin Zhu
  • Lei Yang
  • Xuemei Zhao
  • Danyang Liu
  • Xiaoli Guo
  • Peng Liu
  • Tianyan Chi
  • Xuefei Ji
  • Libo Zou
Original Investigation
  • 281 Downloads

Abstract

Rationale

Alzheimer’s disease (AD) is characterized by memory loss and synaptic damage. Previous studies suggested that xanthoceraside decreases glutamate-induced PC12 cell death, ameliorates memory deficits, and increases the number of dendritic spines in AD mice. These results indicated that xanthoceraside might have activities that protect synaptic plasticity. Herein, we detected the effect of xanthoceraside on synaptic function.

Materials and methods

Three-month-old APP/PS1 transgenic mice were orally treated with xanthoceraside (0.02, 0.08, or 0.32 mg/kg) once daily for 4 months and then behavioral tests were performed. LTP and Fluo-4/AM were carried out in vivo and in vitro, respectively. CaMKII-GluR1 and NR2B-associated proteins on synapses were measured.

Results

Xanthoceraside administration alleviated learning-memory deficits and increased the LTP in APP/PS1 transgenic mice. Meanwhile, xanthoceraside increased the expression of pT286-CaMKII in synaptic and extrasynaptic pools and CaMKII, pS831-GluR1, and GluR1 in synaptic pools. In addition, xanthoceraside increased the total pY1472-NR2B and NR2B expression and increased the levels of pY1472-NR2B in synaptic and extrasynaptic pools and NR2B in synaptic pools. However, NR2B was decreased in extrasynaptic pools, which might be associated with decreased expression of STEP61 and pY531-Fyn. In vitro studies showed that xanthoceraside inhibited intracellular calcium overload and increased the number of and extended the length of dendrites in primary hippocampal neurons compared with the Aβ25–35 group.

Conclusions

The mechanism of xanthoceraside on ameliorating learning-memory deficits might be related to decrease intracellular calcium overload, increase CaMKII-GluR1 proteins, and up-regulate trafficking of pY1472-NR2B at synapse, thereby improving LTP in APP/PS1 transgenic mice.

Keywords

Alzheimer’s disease Xanthoceraside Learning-memory deficits Synapse LTP 

Notes

Acknowledgements

This study was supported by the Research Fund for National Natural Science Foundation of China (No. 81373992) and the Joint Founds of NSFC-Liaoning (U1508220).

Author contributions

L. Zhu conceived the experiments, contributed to research data, and drafted the manuscript; X. Ji, T. Chi, and P. Liu revised the manuscript. X. Zhao, L. Yang, and D. Liu contributed to technical assistance. X. Guo contributed to raise animals. L. Zou revised the manuscript and supervised the analysis.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

213_2017_4775_MOESM1_ESM.rar (189.5 mb)
ESM 1 (RAR 194091 kb)

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Department of Pharmacology, Life Science and Biopharmaceutics SchoolShenyang Pharmaceutical UniversityShenyangPeople’s Republic of China

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