Neurochemical Research

, Volume 43, Issue 4, pp 959–971 | Cite as

Protective Effects of Cornel Iridoid Glycoside in Rats After Traumatic Brain Injury

  • Denglei Ma
  • Na Wang
  • Xiaotong Fan
  • Lan Zhang
  • Yi Luo
  • Rui Huang
  • Li Zhang
  • Yali Li
  • Guoguang Zhao
  • Lin Li
Original Paper
  • 109 Downloads

Abstract

Cornel iridoid glycoside (CIG) is the active ingredient extracted from Cornus officinalis. Our previous studies showed that CIG had protective effects on several brain injury models. In the present study, we aimed to examine the effects and elucidate the mechanisms of CIG against traumatic brain injury (TBI). TBI was induced in the right cerebral cortex of male adult rats. The neurological and cognitive functions were evaluated by modified neurological severity score (mNSS) and object recognition test (ORT), respectively. The level of serum S100β was measured by an ELISA method. Nissl staining was used to estimate the neuron survival in the brain. The expression of proteins was determined by western blot and/or immunohistochemical staining. We found that intragastric administration of CIG in TBI rats ameliorated the neurological defects and cognitive impairment, and alleviated the neuronal loss in the injured brain. In the acute stage of TBI (24–72 h), CIG decreased the level of S100β in the serum and brain, increased the ratio of Bcl-2/Bax and decreased the expression of caspase-3 in the injured cortex. Moreover, the treatment with CIG for 30 days increased the levels of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF), enhanced the expression of synapsin I, synaptophysin and postsynaptic density protein 95 (PSD-95), and inhibited the apoptosis-regulating factors in the chronic stage of TBI. The present study demonstrated that CIG had neuroprotective effects against TBI through inhibiting apoptosis in the acute stage and promoting neurorestoration in the chronic stage. The results suggest that CIG may be beneficial to TBI therapy.

Keywords

Cornel iridoid glycoside Traumatic brain injury Behavior impairment Apoptosis Neurotrophic factor Synaptic protein 

Notes

Acknowledgements

This research was supported by National Natural Science Foundation of China (81273498, 81341087, 81473373); National Key Research and Development Program of China (2016YFC0103909); Beijing Municipal Science & Technology Commission project (Z161100000516008); Beijing High-level Health and Technical Personal Plan (2011-1-7, 2014-2-014).

Compliance with Ethical Standards

Conflict of interest

The authors declare that there are no conflicts of interest associated with this manuscript.

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Authors and Affiliations

  1. 1.Department of PharmacologyXuanwu Hospital of Capital Medical University; Beijing Engineering Research Center for Nerve System Drugs; Key Laboratory for Neurodegenerative Diseases of Ministry of EducationBeijingChina
  2. 2.Department of NeurosurgeryXuanwu Hospital of Capital Medical University; Beijing Institute for Brain DisordersBeijingChina

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