Hydroxytyrosol butyrate inhibits 6-OHDA-induced apoptosis through activation of the Nrf2/HO-1 axis in SH-SY5Y cells

Megumi Funakohi-Tago, Tomoki Sakata, Satoru Fujiwara, Ayaka Sakakura, Takeshi Sugai, Kenji Tago, Hiroomi Tamura

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


Hydroxytyrosol (HT) is a polyphenol contained in olives and exhibits antioxidant activity. We herein investigated the effects of HT and its derivatives, hydroxytyrosol acetate (HT-A) and hydroxytyrosol butyrate (HT-B), on the protection of neuronal cells against apoptosis induced by the Parkinson's disease-related neurotoxin 6-hydroxydopamine (6-OHDA). The pretreatment of SH-SY5Y cells with HT-B, but not HT or HT-A significantly reduced the 6-OHDA-induced generation of reactive oxygen species, activation of caspase-3, and subsequent cell death. HT-B also induced the protein expression of the transcription factor, NF-E2-related factor-2 (Nrf2) and its transcriptional activation, resulting in the up-regulated expression of heme oxygenase-1 (HO-1), which conferred neuroprotection against 6-OHDA-induced oxidative damage. Furthermore, three cysteine residues, Cys151, Cys273, and Cys288 in Kelch-like ECH-associated protein 1 (Keap1) were necessary for the HT-B-induced activation of Nrf2. Collectively, the present results demonstrated that HT-B, harboring higher fat solubility than HT and HT-A, effectively elicited adaptive responses to oxidative stress by activating the Nrf2/HO-1 axis in neuronal cells.

Original languageEnglish
Pages (from-to)246-256
Number of pages11
JournalEuropean journal of pharmacology
Publication statusPublished - 2018 Sept 5


  • Antioxidant activity
  • HO-1
  • Hydroxytyrosol butyrate
  • Keap1
  • Nrf2

ASJC Scopus subject areas

  • Pharmacology


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