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Open AccessArticle

Neuroprotective Activity of Mentha Species on Hydrogen Peroxide-Induced Apoptosis in SH-SY5Y Cells

1
School of Biomedical Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia
2
Graham Centre for Agricultural Innovation (an alliance between Charles Sturt University and NSW Department of Primary Industries), Pugsley Place, Wagga Wagga, NSW 2795, Australia
3
Department of Pharmacognosy, National Research Centre, Dokki, Cairo 12622, Egypt
4
School of Agricultural & Wine Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW 2678, Australia
5
Department of Biology, Faculty of Science, Wasit University, Al Kut, Wasit 52001, Iraq
*
Author to whom correspondence should be addressed.
Nutrients 2020, 12(5), 1366; https://doi.org/10.3390/nu12051366
Received: 18 April 2020 / Revised: 2 May 2020 / Accepted: 6 May 2020 / Published: 10 May 2020
(This article belongs to the Section Phytochemicals and Human Health)
Alzheimer’s disease (AD) is a progressive neurodegenerative disorder with an unclear cause. It appears that multiple factors participate in the process of neuronal damage including oxidative stress and accumulation of the protein amyloid β (Aβ) in the brain. The search for a treatment for this disorder is essential as current medications are limited to alleviating symptoms and palliative effects. The aim of this study is to investigate the effects of mint extracts on selected mechanisms implicated in the development of AD. To enable a thorough investigation of mechanisms, including effects on β-secretase (the enzyme that leads to the formation of Aβ), on Aβ aggregation, and on oxidative stress and apoptosis pathways, a neuronal cell model, SH-SY5Y cells, was selected. Six Mentha taxa were investigated for their in vitro β-secretase (BACE) and Aβ-aggregation inhibition activities. Moreover, their neuroprotective effects on H2O2-induced oxidative stress and apoptosis in SH-SY5Y cells were evaluated through caspase activity. Real-time PCR and Western blot analysis were carried out for the two most promising extracts to determine their effects on signalling pathways in SH-SY5Y cells. All mint extracts had strong BACE inhibition activity. M. requienii extracts showed excellent inhibition of Aβ-aggregation, while other extracts showed moderate inhibition. M. diemenica and M. requienii extracts lowered caspase activity. Exposure of SH-SY5Y cells to M. diemenica extracts resulted in a decrease in the expression of pro-apoptotic protein, Bax, and an elevation in the anti-apoptotic protein, Bcl-xL, potentially mediated by down-regulation of the ASK1-JNK pathway. These results indicate that mint extracts could prevent the formation of Aβ and also could prevent their aggregation if they had already formed. M. diemenica and M. requienii extracts have potential to suppress apoptosis at the cellular level. Hence, mint extracts could provide a source of efficacious compounds for a therapeutic approach for AD. View Full-Text
Keywords: Alzheimer’s disease; amyloid β; β-secretase; Bax; caspase; Lamiaceae; mint; oxidative stress Alzheimer’s disease; amyloid β; β-secretase; Bax; caspase; Lamiaceae; mint; oxidative stress
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Hanafy, D.M.; Prenzler, P.D.; Burrows, G.E.; Gurusinghe, S.; Thejer, B.M.; Obied, H.K.; Hill, R.A. Neuroprotective Activity of Mentha Species on Hydrogen Peroxide-Induced Apoptosis in SH-SY5Y Cells. Nutrients 2020, 12, 1366.

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