Metabolic Brain Disease

, Volume 31, Issue 2, pp 455–463 | Cite as

Echinocystic acid reduces reserpine-induced pain/depression dyad in mice

  • Shuo Li
  • Jing Han
  • Dong-sheng Wang
  • Bin Feng
  • Ya-ting Deng
  • Xin-shang Wang
  • Qi Yang
  • Ming-gao Zhao
Original Article

Abstract

Chronic pain has consistently been correlated with depression. Echinocystic acid (EA), a natural triterpone enriched in various herbs and used for medicinal purpose in many Asian countries, exhibits anti-inflammatory and analgesic activities. However, little is known the effects of EA on the depression. In present study, we investigated the anti-depression activities in the mouse model of reserpine-induced pain-depression dyad. Reserpine (1 mg/kg subcutaneously daily for 3 days) caused significant depression-like behaviors and pain sensation. Subsequent treatment of EA (5 mg/kg intragastrically daily for 5 days) attenuated the reserpine-induced pain/depression dyad as shown by the increase of pain threshold and the behaviors in forced swimming test, tail suspension test, and open field test. Furthermore, treatment of EA reversed the decrease of biogenic amines (norepinephrine, dopamine, and serotonin) in the brain region of hippocampus, a structure involved in the formation of emotional disorders. Levels of serotonin receptor 5-HT1A were decreased and levels of 5-HT2A were increased in the reserpine-injected mice. Treatment of EA could restore the alterations of serotonin receptors. At the same time, the increase in GluN2B-containing NMDA receptors, p-GluA1-Ser831, PSD-95 and CaMKII were integrated with the increase in caspase-3 and iNOS levels in the hippocampus of the reserpine-injected mice. EA significantly reversed the changes of above proteins. However, EA did not affect the levels of GluN2A-containing NMDA receptors and the total levels of GluA1 and p-GluA1-Ser845. Our study provides strong evidence that EA attenuates reserpine-induced pain/depression dyad partially through regulating the biogenic amines levels and GluN2B receptors in the hippocampus.

Keywords

Echinocystic acid Pain Depression NMDA receptor Serotonin Hippocampus 

Notes

Acknowledgments

This research was supported by National Natural Science Foundation of China, No. 31271144, 31325022, and 2013DFG32650.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Shuo Li
    • 1
  • Jing Han
    • 1
  • Dong-sheng Wang
    • 2
  • Bin Feng
    • 1
  • Ya-ting Deng
    • 1
  • Xin-shang Wang
    • 1
  • Qi Yang
    • 1
  • Ming-gao Zhao
    • 1
  1. 1.Department of Pharmacology, School of PharmacyThe Fourth Military Medical UniversityXi’anChina
  2. 2.Department of Orthopedics, Jinling Hospital, Clinical School of NanjingSecond Military Medical UniversityNanjingChina

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