Dietary oxyresveratrol prevents parkinsonian mimetic 6-hydroxydopamine neurotoxicity

Jianfei Chao, Man Shan Yu, Yuen Shan Ho, Mingfu Wang, Raymond Chuen Chung Chang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

133 Citations (Scopus)

Abstract

Oxyresveratrol (OXY) is a polyhydroxylated stilbene existing in mulberry. Increasing lines of evidence have shown its neuroprotective effects against Alzheimer disease and stroke. However, little is known about its neuroprotective effect in Parkinson disease (PD). Owing to its antioxidant activity, blood-brain barrier permeativity, and water solubility, we hypothesized that OXY may exert neuroprotective effects against parkinsonian mimetic 6-hydroxydopamine (6-OHDA) neurotoxicity. Neuroblastoma SH-SY5Y cells have long been used as dopaminergic neurons in PD research. We found that both pretreatment and posttreatment with OXY on SH-SY5Y cells significantly reduced the release of lactate dehydrogenase, the activity of caspase-3, and the generation of intracellular reactive oxygen species triggered by 6-OHDA. Compared to resveratrol, OXY exhibited a wider effective dosage range. We proved that OXY could penetrate the cell membrane by HPLC analysis of cell extracts. These results suggest that OXY may act as an intracellular antioxidant to reduce oxidative stress induced by 6-OHDA. Western blot analysis demonstrated that OXY markedly attenuated 6-OHDA-induced phosphorylation of JNK and c-Jun. Furthermore, we proved that OXY increased the basal levels of SIRT1, which may disclose new pathways accounting for the neuroprotective effects of OXY. Taken together, our results suggest OXY, a dietary phenolic compound, as a potential nutritional candidate for protection against neurodegeneration in PD.
Original languageEnglish
Pages (from-to)1019-1026
Number of pages8
JournalFree Radical Biology and Medicine
Volume45
Issue number7
DOIs
Publication statusPublished - 1 Oct 2008
Externally publishedYes

Keywords

  • 6-Hydroxydopamine
  • Free radicals
  • Neuroprotection
  • Oxyresveratrol
  • Parkinson disease
  • Resveratrol

ASJC Scopus subject areas

  • Medicine(all)
  • Toxicology
  • Clinical Biochemistry

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