Electro-acupuncture stimulation protects dopaminergic neurons from inflammation-mediated damage in medial forebrain bundle-transected rats

Xian Yu Liu, Hui Fang Zhou, Yan Li Pan, Xi Bin Liang, Dong Bin Niu, Bing Xue, Feng Qiao Li, Qi Hua He, Xin Hong Wang, Xiao Min Wang

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Through producing a variety of cytotoxic factors upon activation, microglia are believed to participate in the mediation of neurodegeneration. Intervention against microglial activation may therefore exert a neuroprotective effect. Our previous study has shown that the electro-acupuncture (EA) stimulation at 100 Hz can protect axotomized dopaminergic neurons from degeneration. To explore the underlying mechanism, the effects of 100 Hz EA stimulation on medial forebrain bundle (MFB) axotomy-induced microglial activation were investigated. Complement receptor 3 (CR3) immunohistochemical staining revealed that 24 sessions of 100 Hz EA stimulation (28 days after MFB transection) significantly inhibited the activation of microglia in the substantia nigra pars compacta (SNpc) induced by MFB transection. Moreover, 100 Hz EA stimulation obviously inhibited the upregulation of the levels of tumor necrosis factor (TNF)-α and interleukin (IL)-1β mRNA in the ventral midbrains in MFB-transected rats, as revealed by reverse transcriptase polymerase chain reaction (RT-PCR). ED1 immunohistochemical staining showed that a large number of macrophages appeared in the substantia nigra (SN) 14 days after MFB transection. The number of macrophages decreased by 47% in the rats that received 12 sessions of EA simulation after MFB transection. These data indicate that the neuroprotective role of 100 Hz EA stimulation on dopaminergic neurons in MFB-transected rats is likely to be mediated by suppressing axotomy-induced inflammatory responses. Taken together with our previous results, this study suggests that the neuroprotective effect of EA on the dopaminergic neurons may stem from the collaboration of its anti-inflammatory and neurotrophic actions.

Original languageEnglish
Pages (from-to)189-196
Number of pages8
JournalExperimental Neurology
Volume189
Issue number1
DOIs
StatePublished - Sep 2004

Keywords

  • Axotomy
  • CR3
  • Complement receptor 3
  • EA
  • Electro-acupuncture
  • IL
  • Inflammation
  • MFB
  • Microglia
  • NO
  • Neuroprotection
  • OD
  • PD
  • Parkinson's disease
  • Proinflammatory cytokines
  • RT-PCR
  • interleukin
  • medial forebrain bundle
  • nitric oxide
  • optical density

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