Ginsenoside-Rd attenuates TRPM7 and ASIC1a but promotes ASIC2a expression in rats after focal cerebral ischemia

Neurol Sci. 2012 Oct;33(5):1125-31. doi: 10.1007/s10072-011-0916-6. Epub 2012 Jan 10.

Abstract

Our previous studies have showed that ginsenoside (GS)-Rd, a mono-compound isolated from traditional Chinese herb panax ginseng, has the neuroprotective effects following ischemic stroke. However, the underlying mechanisms are still largely unknown. Our latest study showed that GS-Rd could block calcium influx in cultured cortical neurons after excitotoxic injury, indicating that GS-Rd may act on cation channels. To explore this possibility, in this study, we used a rat middle cerebral artery occlusion (MCAO) model to examine the effects of GS-Rd on the expression of non-selective cation channels, including transient receptor potential melastatin (TRPM) and acid sensing ion channels (ASIC), and cation channels, including N-methyl-D-aspartate (NMDA) receptors, which all play essential roles in ischemic stroke. Our results showed that both TRPM and ASIC channels were expressed in the brain. At 24 h following MCAO insult, mRNA and protein expression levels of TRPM7, ASIC1a and ASIC2a were significantly increased. Pretreatment of 10 mg/kg GS-Rd attenuated MCAO-induced expression of TRPM7 and ASIC1a but promoted that of ASIC2a. In contrast, GS-Rd had no significant effects on the expression of NMDA receptors. Thus, our results suggest that GS-Rd neuroprotection following cerebral ischemia may be at least due to its effects on the expression of TRPM7, ASIC1a and ASIC2a.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acid Sensing Ion Channels / biosynthesis*
  • Animals
  • Blotting, Western
  • Brain / drug effects
  • Brain / metabolism
  • Disease Models, Animal
  • Ginsenosides / pharmacology*
  • Infarction, Middle Cerebral Artery / metabolism*
  • Male
  • Neuroprotective Agents / pharmacology*
  • Rats
  • Rats, Sprague-Dawley
  • Real-Time Polymerase Chain Reaction
  • Reverse Transcriptase Polymerase Chain Reaction
  • TRPM Cation Channels / biosynthesis*

Substances

  • Acid Sensing Ion Channels
  • Asic1 protein, rat
  • Ginsenosides
  • Neuroprotective Agents
  • TRPM Cation Channels
  • Trpm7 protein, rat
  • ginsenoside Rd