• The Korea Journal of Herbology
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• v.23 no.3
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• pp.53-60
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• 2008

Objectives : Oxidative stress has a critical role in neurodegenerative diseases. In this study, we investigated the antioxidant and neuroprotective effects of the ethanolic extract of Banryong-hwan (BRHE) in SH-SY5Y cells and primary rat mesencephalic dopaminergic neurons. Methods : To assess the antioxidant effects, we carried out 1,1-diphenyl-2-picrylhydrazyl(DPPH) free radical scavenging assay, 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid)(ABTS) radical cation decolorization assay, and determination of total polyphenolic content. We evaluated the effect of BRHE treatment on neuroprotection against 6-hydroxydopamine(6-OHDA) toxicity using thiazolyl blue tetrazolium bromide(MTT) assay, nitric oxide(NO) assay, reactive oxygen species(ROS) assay in SH-SY5Y cells and tyrosine hydroxylase(TH) immunocytochemistry in primary rat mesencephalic dopaminergic neurons. Results : BRHE showed IC50 values of 328.10 ${\mu}g/mL$ and 43.12 ${\mu}g/mL$ in DPPH assay and in ABTS assay, respectively. Total polyphenolic content was 180.76 ${\mu}g/mL$. In SH-SY5Y cells, BRHE significantly attenuated the toxicity induced by 6-OHDA at the concentrations of 25-100 ${\mu}g/mL$ pre- and post- treatment in MTT assay. While 6-OHDA increased the NO and ROS contents, BRHE decreased them in a dose dependent manner. Moreover, in primary dopaminergic neuron culture, BRHE significantly protect-ed the dopaminergic cell loss against 6-OHDA toxicity up to 136% at the concentration of 75 ${\mu}g/mL$. Conclusions : These results demonstrate that BRHE has neuroprotective effect against 6-OHDA induced neurotoxicity through decreasing NO and ROS generation.

• Archives of Pharmacal Research
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• v.28 no.7
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• pp.804-809
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• 2005

The EtOAc-soluble fraction from a methanolic extract of Hovenia dulcis Thunb. exhibited neuroprotective activity against glutamate-induced neurotoxicity in mouse hippocampal HT22 cells. The neuroprotective activity-guided isolation resulted in 8 phenolic compounds (1-8), such as vanillic acid (1), ferulic acid (2), 3,5-dihydroxystilbene (3), (+)-aromadendrin (4), methyl vanillate (5), (-)-catechin (6), 2,3,4-trihydrobenzoic acid (7), and (+)-afzelechin (8). Among these, compounds 6 and 8 had a neuroprotective effect on the glutamate-induced neurotoxicity in HT22 cells. Furthermore, compound 6 had a DPPH free radical scavenging effect with an $IC_{50}$ value of $57.7{\mu}M$, and a superoxide anion radical scavenging effect with an $IC_{50}$ value of $8.0{\mu}M$. Both compounds 6 and 8 had ABTS cation radical scavenging effects with $IC_{50}$ values of $7.8{\mu}M\;and\;23.7${\mu}M$, respectively. These results suggest that compounds 6 and 8 could be neuroprotectants owing to their free radical scavenging activities.

• Journal of Life Science
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• v.19 no.7
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• pp.963-967
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• 2009

This study evaluated the neuroprotective effect of extracts from the root bark of Morus alba (MA) against glutamate-induced cytotoxicity in neuronal cells. Glutamate-induced cytotoxicity was shown by MTT reduction assay. The neuroprotective effects of methanol, ethanol, and acetone extracts from MA against glutamate-induced cytotoxicity were measured. Among the three extracts, the methanolic extracts showed the highest protective effect, as determined by the results of an morphological assay, a lactate dehydrogenase release assay. Furthermore, the methanol extracts were fractionated sequentially with hexane, diethyl ether, ethyl acetate, and water layer according to degree of polarity. The hexane fractions exhibited a neuroprotective effect against glutamate-stressed N18-RE-105 cells. Therefore, these results suggest that extracts of MA could be a new potential candidate as a protective substance against glutamate-induced cytotoxicity.

• Proceedings of the Korean Society of Applied Pharmacology
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• 2007.04a
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• pp.115-121
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• 2007

Opuntia ficus-indica var. saboten (Cactaceae) is widely cultivated in Jeju Island (South Korea) for use in the manufacture of health foods such as tea, jam and juice. Its fruit and stem have been traditionally used as oriental folk medicine to treat diabetes, hypertension, asthma, burns, edema and indigestion. During the search for naturally occurring antioxidative neuroprotective agents, it was found that the ethyl acetate fraction of the stems and fruits of Opuntia ficus-indica var. saboten exhibited potent antioxidant effect. Using a chromatographic fractionation method, several constituents were isolated from this fraction. Among isolates, KYS50182 showed the most potent in vitro and in vivo neuroprotective activities, suggesting that the flavonoid can serve as a lead structure for the development of neuroprotective agents by providing neuroprotection against oxidative and focal ischemic neuronal injuries.

• Journal of Microbiology and Biotechnology
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• v.33 no.9
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• pp.1189-1196
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• 2023

This study proposed to demonstrate the neuroprotective effects of heat-killed Levilactobacillus brevis KU15152. Heat-killed L. brevis KU15152 showed antioxidant activity similar to that of Lacticaseibacillus rhamnosus GG, in terms of radical scavenging activity. To evaluate the neuroprotective effects, conditioned medium (CM) obtained by incubating heat-killed bacteria in intestinal cells (HT-29) was used through gut-brain axis. CM from L. brevis KU15152 protected neuroblastoma cells (SH-SY5Y) against H₂O₂-induced oxidative stress. Pretreatment with CM significantly alleviated the morphological changes induced by H₂O₂. Heat-killed L. brevis KU15152 showed an increased brain-derived neurotrophic factor (BDNF) expression in HT-29 cells. L. brevis KU15152-CM remarkably downregulated the Bax/Bcl-2 ratio, while upregulating the expression of BDNF and tyrosine hydroxylase (TH) in SH-SY5Y cells. Furthermore, L. brevis KU15152-CM reduced caspase-3 activity following H₂O₂ treatment. In conclusion, L. brevis KU15152 can be potentially used as food materials to avoid neurodegenerative diseases.

• YAKHAK HOEJI
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• v.57 no.5
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• pp.323-329
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• 2013

This study was designed to determine and compare the cognitive enhancing effect of various Codonopsis lanceolata extracts by steaming, fermentation and high hydrostatic pressure process. We prepared water extract of C. lanceolata, steamed C. lanceolata, steamed and fermented C. lanceolata and C.lanceolata by high hydrostatic pressure process and fermentation. Cognitive enhancing effect of extracts was evaluated in scopolamine-induced memory impairment mice using by passive avoidance test and Morris water maze tests. MTT assay was conducted to investigate neuroprotective effect on glutamate induced cell death in HT22 cells. Steamed and fermented C. lanceolata water extract decreased escape latency in Morris water maze test and increased the latency time of the passive avoidance test compared to other extracts. Furthermore, the steamed and fermented C. lanceolata water extract showed neuroprotective effect. These results suggest that steaming and fermentation process more improve cognitive enhancing effect of C. lanceolata than other process.

• Food Science and Biotechnology
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• v.15 no.5
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• pp.735-738
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• 2006

We examined the neuroprotective and neurotrophic effects of genipin fractionated from gardenia (Gardenia jasminoides Ellis) originating from Korea. The neurotrophic effects of the genipin containing fraction was evaluated by microscopically monitoring its potency to induce neurite outgrowth in PC12h cells. The genipin containing fraction from Korean gardenia promoted neurite outgrowth in PC12h cells in this study, similar to previously reported effects by Wako Chemical, Japan. When cells were treated with the genipin containing fraction prior to ${\beta}$-amyloid peptide treatment (active domain of A peptide 25-35 treated), toxicity was significantly diminished (p<0.0l). These results suggest that genipin prepared from Korean gardenia might potentially be used as a precautionary agent in neurodegenerative disease, such as Alzheimer's disease, etc.

• Journal of Physiology & Pathology in Korean Medicine
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• v.22 no.2
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• pp.321-327
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• 2008

This study evaluated neuroprotective effects of Yanggyuksanhwa-tang (YST) on global cerebral ischemia of diabetic rats. On primary experiment, diabetic condition in rats was induced by streptozotocin injection. Secondarily, global cerebral ischemia was induced by bilateral occlusion of the common carotid artery with hypotension (BCAO) under the diabetic condition. Then neuroprotective effect of YST was observed with changes of neuronal c-Fos and Bax expressions, and GFAP expression in the brain tissues by using immunohistochemistry. YST treatment was resulted significant decrease of c-Fos expression in CA1 hippocampus induced by BCAO on diabetic rats. YST treatment was resulted significant decrease of Bax expression in CA1 hippocampus induced by BCAO on diabetic rats. YST treatment was resulted significant decrease of c-Fos expression in cerebral cortex and caudoputamen induced by BCAO on diabetic rats. YST treatment was resulted significant decrease of GFAP expression in cerebral cortex induced by BCAO on diabetic rats. These results suggest that YST has effects on neuroprotection against cerebral ischemic damage under diabetic condition. And it is supposed that neuroprotective effect of YST reveals by anti-apoptosis mechanism.

• Mycobiology
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• v.35 no.1
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• pp.11-15
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• 2007

We examined the neuroprotective and neurotrophic effects of Tremella fuciformis. The neurotrophic effects of the hot water extract of T. fuciformis was evaluated by microscopically monitoring its potency to induce neurite outgrowth in PC12h cells. The hot water extract cf T. fuciformis promoted neurite outgrowth in PC12h cells in this study, superior to other natural substances which was reported previously. When cells were treated with the hot water extract of T. fuciformis prior to ${\beta}$-amyloid peptide treatment (active domain of A peptide $35{\sim}35$ treated), toxicity was significantly diminished (p<0.01). These results suggest that T. fuciformis might potentially be used as a precautionary agent in neurodegenerative disease, such as Alzheimer's disease, etc.

• Journal of Physiology & Pathology in Korean Medicine
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• v.21 no.3
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• pp.741-747
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• 2007

This study evaluated neuroprotective effects of Yanggyuksanhwa-tang (YST), which have been known to be efficacy in the treatment of the stroke and diabetes. on focal cerebral ischemia of diabetic rats. On primary experiment, diabetic condition in rats was induced by streptozotocin injection, then, focal cerebral ischemia was induced by the middle cerebral artery occlusion (MCAO) under the diabetic condition. Then neuroprotective effect of YST was observed with changes of infarct size and volume, expressions of c-Fos, Bax, and hypoxia inducible factor (HIF)-1${\alpha}$ in the brain tissues by using 2% 2,3,5-triphenyltetrazolium chloride (TTC) staining and immunohistochemistry. YST treatment showed a significant decrease of infarct size and volume induced by MCAO in diabetic rats. YST treatment showed a significant decrease of c-Fos and Bax positive neurons in cortex penumbra. YST treatment showed a decrease of HIF-l${\alpha}$ positive neurons in cortex penumbra, but it was not significant statistically. These results suggest that YST has effects on neuroprotection against cerebral infarct under diabetic condition. And it is supposed that neuroprotective effect of YST reveals by anti-apoptosis mechanism.