Taraxacum coreanum protects against glutamate-induced neurotoxicity through heme oxygenase-1 expression in mouse hippocampal HT22 cells

Yoon,Chi-Su; Ko,Wonmin; Lee,Dong-Sung; Kim,Dong-Cheol; Kim,Jongsu; Choi,Moonbum; Beom,Jin  Seon; An,Ren-Bo; Oh,Hyuncheol; Kim,Youn-Chul

doi:10.3892/mmr.2017.6237

Taraxacum coreanum protects against glutamate-induced neurotoxicity through heme oxygenase-1 expression in mouse hippocampal HT22 cells

Authors:
- Chi-Su Yoon
- Wonmin Ko
- Dong-Sung Lee
- Dong-Cheol Kim
- Jongsu Kim
- Moonbum Choi
- Jin Seon Beom
- Ren-Bo An
- Hyuncheol Oh
- Youn-Chul Kim
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Affiliations: College of Pharmacy, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea, Department of Biomedical Chemistry, College of Health and Biomedical Science, Konkuk University, Chungju, Chungbuk 27478, Republic of Korea, Key Laboratory of Natural Resources of Changbai Mountain & Functional Molecules (Yanbian University), Ministry of Education, Yanji, Jilin 133002, P.R. China
Published online on: February 22, 2017 https://doi.org/10.3892/mmr.2017.6237
Pages: 2347-2352

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Abstract

Taraxacum coreanum Nakai is a dandelion that is native to Korea, and is widely used as an edible and medicinal herb. The present study revealed the neuroprotective effect of this plant against glutamate-induced oxidative stress in HT22 murine hippocampal neuronal cells. Ethanolic extracts from the aerial (TCAE) and the root parts (TCRE) of T. coreanum were prepared. Both extracts were demonstrated, by high performance liquid chromatography, to contain caffeic acid and ferulic acid as representative constituents. TCAE and TCRE significantly increased cell viability against glutamate-induced oxidative stress in mouse hippocampal HT22 cells. Western blot analysis revealed that treatment of HT22 cells with the extracts induced increased expression of the enzyme heme oxygenase-1 (HO-1), compared with untreated cells, in a concentration-dependent manner. Increased HO-1 enzymatic activity, compared with untreated cells, was also demonstrated following treatment with TCAE and TCRE. In addition, western blot analysis of the nuclear fractions of both TCAE and TCRE-treated HT22 cells revealed increased levels of nuclear factor erythroid 2 like 2 (Nrf2) compared with untreated cells, and decreased Nrf2 levels in the cytoplasmic fraction compared with untreated cells. The present study suggested that the neuroprotective effect of T. coreanum is associated with induction of HO-1 expression and Nrf2 translocation to the nucleus. Therefore, T. coreanum exhibits a promising function in prevention of neurodegeneration. Further studies will be required for the isolation and the full characterization of its active substances.

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