Neuroprotective effects of orientin on hydrogen peroxide‑induced apoptosis in SH‑SY5Y cells

Law,Benjamin Ngee Tiing; Ling,Anna Pick Kiong; Koh,Rhun Yian; Chye,Soi Moi; Wong,Ying Pei

doi:10.3892/mmr.2013.1878

Neuroprotective effects of orientin on hydrogen peroxide‑induced apoptosis in SH‑SY5Y cells

Authors:
- Benjamin Ngee Tiing Law
- Anna Pick Kiong Ling
- Rhun Yian Koh
- Soi Moi Chye
- Ying Pei Wong
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Affiliations: School of Medical Sciences, Faculty of Medicine and Health, International Medical University, Kuala Lumpur 57000, Malaysia, Department of Human Biology, Faculty of Medicine and Health, International Medical University, Kuala Lumpur 57000, Malaysia
Published online on: December 24, 2013 https://doi.org/10.3892/mmr.2013.1878
Pages: 947-954

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Abstract

Neurodegenerative diseases remain a global issue which affects the ageing population. Efforts towards determining their aetiologies to understand their pathogenic mechanisms are underway in order to identify a pathway through which therapeutic measures can be applied. One such pathogenic mechanism, oxidative stress (OS), is widely considered to be involved in neurodegenerative disease. Antioxidants, most notably flavonoids, have promising potential for therapeutic use as shown in in vitro and in vivo studies. In view of the importance of flavonoids for combating OS, this study investigated the neuroprotective effects of orientin, which has been reported to be capable of crossing the blood‑brain barrier. The maximum non‑toxic dose (MNTD) of orientin against SH‑SY5Y neuroblastoma cells was determined using a 3‑(4,5‑dimethylthiazol‑2‑yl)‑2,5‑diphenyltetrazolium bromide (MTT) assay. The effects of the MNTD and the half MNTD (½MNTD) of orientin on cell cycle progression and intracellular reactive oxygen species (ROS) levels, as well as the activity of caspases 3/7, 8 and 9 after exposure to 150 µM of hydrogen peroxide (H2O2) were also determined using flow cytometry, a 2',7'‑dichlorodihydrofluorescein‑diacetate (DCFH‑DA) assay and caspase assay kits, respectively. The results revealed that orientin at ≤20 µM was not cytotoxic to SH‑SY5Y cells. After treatment with orientin at the MNTD, the percentage of apoptotic cells was significantly reduced compared with that in cells treated with 150 µM H2O2 alone. The results also showed that, although orientin at the MNTD and ½MNTD did not reduce intracellular ROS levels, it significantly inhibited the activity of caspases 3/7. Caspase 9 was significantly inactivated with orientin at the MNTD. Findings from this study suggest that the neuroprotection conferred by orientin was the result of the intracellular mediation of caspase activity.

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