• Toxicological Research
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• 제14권4호
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• pp.483-488
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• 1998

During cerebral ischemia two important factors such as hypoxia and reduction of glucose can act as modulating stressor affecting the release of amine neurotransmitters including 5-hydroxytryptamine (5-HT). This study was performed to investigate the effect of glucose deprivation on the oxygen deprivation-induced changes of [3H]-5-HT release in the rat hippocampal slices. Experimental groups were divided into 4 groups for this study: normoxic/normoglycemic group, oxygen-deprived group, glucose-deprived group, and oxygen/glucose-deprived group. The hippocampus of rat brain was sliced by 400 $\mu\textrm{m}$ thickness with manual chopper. After 30 minutes preincubation in the normal buffer, the slices were incubated for 20 min in buffer containing [3H]-5-HT (0.1 M, 74 $\mu\textrm$Ci) for uptake. To measure the release of [3H]-5-HT into the buffer, the incubation medium was drained of and refilled with fresh buffer every ten minutes through a sequence of 14 tubes. Oxygen deprivation by gassing with 95% $N_2$/5% $CO_2$ and/or glucose deprivation was done in the 6th and 7th tube. The radioactivities in each buffer and the tissue were counted using scintillation counter. The results were expressed as fractional release. When slices were exposed to oxygen-deprived media for 20 min, the diminution followed by the rebound release of [3H]-5-HT was observed during the post-oxygen deprived period. However, glucose deprivation or oxygen/glucose deprivation markedly increased the release of [3H]-5-HT. which was opposite to the pattern observed in oxygen-deprived group. These results suggested that oxygen deprivation itself inhibits [3H]-5-HT release in rat hippocampal slices during oxygen-deprived period, but additional glucose deprivation convert the inhibitory response to increase of [3H]-5-HT release.

• Food Science and Biotechnology
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• 제16권4호
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• pp.632-635
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• 2007

This study examined the neuroprotective effect of scopoletin from Angelica dahurica against oxygen and glucose deprivation-induced neurotoxicity in a rat organotypic hippocampal slice culture. Scopoletin reduced the propidium iodide (PI) uptake, which is an indication of impaired cell membrane integrity. In addition, it inhibited the loss of NeuN, which represents the viability of neuronal cells. The results suggests that scopoletin from A. dahurica protects neuronal cells from the damage caused by oxygen and glucose deprivation.

• 대한한의학회지
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• 제31권2호
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• pp.1-18
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• 2010

Objective: The water extract of Chilgi-tang (CGT) has been traditionally used in treatment of heart diseases caused by stress in Oriental Medicine. However, little is known about the mechanism by which CGT rescues neuronal cells from injury damage. Therefore, this study was designed to evaluate the protective effects of CGT on Neuro-2A cells by glucose deprivation-induced cell death. Methods: We investigated how cell death induced by glucose deprivation was associated with increased reactive oxygen species (ROS) generation. Result: The CGT treatment prior to glucose deprivation insult significantly reduced the number of cell deaths and the glucose deprivation-induced increase in ROS. Nitric oxide (NO) was also attenuated by CGT treatment. In addition, we demonstrated that the anti-cell death effect of CGT was blocked by heme oxygenase-1 (HO-1) activation. Finally, pretreatment of cells with a hemin, HO-1 inducer, reduced glucose deprivation-induced cell death. In contrast, pretreatment of cells with a ZnPP, HO-1 activity inhibitor, attenuated CGT-induced inhibition of cell death. Conclusions: These findings indicate that ROS plays an important role in glucose deprivation-induced cell death and that CGT may prevent glucose deprivation-induced cell death by inhibiting the ROS generation through HO-1 activation in Neuro-2A cells.

• Molecules and Cells
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• 제46권11호
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• pp.655-663
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• 2023

Autophagy dysfunction is associated with human diseases and conditions including neurodegenerative diseases, metabolic issues, and chronic infections. Additionally, the decline in autophagic activity contributes to tissue and organ dysfunction and aging-related diseases. Several factors, such as down-regulation of autophagy components and activators, oxidative damage, microinflammation, and impaired autophagy flux, are linked to autophagy decline. An autophagy flux impairment (AFI) has been implicated in neurological disorders and in certain other pathological conditions. Here, to enhance our understanding of AFI, we conducted a comprehensive literature review of findings derived from two well-studied cellular stress models: glucose deprivation and replicative senescence. Glucose deprivation is a condition in which cells heavily rely on oxidative phosphorylation for ATP generation. Autophagy is activated, but its flux is hindered at the autolysis step, primarily due to an impairment of lysosomal acidity. Cells undergoing replicative senescence also experience AFI, which is also known to be caused by lysosomal acidity failure. Both glucose deprivation and replicative senescence elevate levels of reactive oxygen species (ROS), affecting lysosomal acidification. Mitochondrial alterations play a crucial role in elevating ROS generation and reducing lysosomal acidity, highlighting their association with autophagy dysfunction and disease conditions. This paper delves into the underlying molecular and cellular pathways of AFI in glucose-deprived cells, providing insights into potential strategies for managing AFI that is driven by lysosomal acidity failure. Furthermore, the investigation on the roles of mitochondrial dysfunction sheds light on the potential effectiveness of modulating mitochondrial function to overcome AFI, offering new possibilities for therapeutic interventions.

• 한국약용작물학회지
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• 제17권5호
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• pp.341-345
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• 2009

Cerebral ischemia results from a transient or permanent reduction in cerebral blood flow that decreases oxygen and glucose supply. When the cellular oxygen supply is reduced to critical level, damage to cells and induction of cell death are occurred by excitotoxicity, oxidative stress and inflammation. Ischemia remains one of the leading causes of death, but there is no effective treatment that might protect neurons gainst ischemia by interrupting the cascade of cell death. In this study, human neuroblastoma SH-SY5Y cells are exposed to oxygen and glucose deprivation (OGD) followed by reoxgenation. OGD can mimic the acute restriction of metabolite and oxygen supply caused by ischemia and is widely used as a model of ischemic conditions. SH-SY5Y cells are treated samples at the commencement of OGD to achieve different final concentrations, and cell viabilities were quantified using the measurement of flow cytometry analysis. Of those tested, the extracts of Polygala tenuifolia (roots), Dictamnus dasycarpus (barks), Polygala tenuifolia (roots), Eucommia ulmoides (branches), Eucommia ulmoides (barks), Poria cocos (whole), Sophora flavescens (roots) showed neuroprotective effects, with $EC_{50}$ values of $4.5{\pm}0.6$, $7.9{\pm}1.5$, $10.5{\pm}0.7$, $18.4{\pm}1.9$, $19.6{\pm}0.3$, $21.6{\pm}1.9$, and $30.7{\pm}3.9{\mu}g/m{\ell}$, respectively.

• 대한한의학회지
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• 제23권4호
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• pp.125-139
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• 2002

Objectives: The purpose of this investigation is to evaluate the effects of Woohwangcheongsim-won and to study the mechanism for neuronal death protection in OGD (oxygen-glucose deprivation) model with embryonic day 20 (E20) cortical cells of a rat (Sprague Dawley). Methods: E20 cortical cells were dissociated in neurobasal media and grown for 14 days in vitro (DIV). On 14 DIV, Woohwangcheongsim-won was added to the culture media for 72 hrs. On 17 DIV, cells were given an oxygen-glucose deprivation shock (2hrs and 4hrs) and further incubated in normoxia for another three days. On 20 DIV, Woohwangcheongsim-won's effects for neuronal death protection were evaluated by LDH assay and the mechanisms were studied by Bcl-2, Bak, Bax, caspase family. Results & Conclusions: 1. This study indicates that Woohwangcheongsim-won's effects for neuronal death protection in OGD model is confirmed by LDH assay in culture method of embryonic day 20(E20) cortical neuroblasts. 2. Woohwangcheongsim-won's mechanisms for neuronal death protection in OGD model are to restrain inflow of cytochrome c into cellularity caused by Bcl-2 increase (2hrs and 4hrs), to reduce the caspase cascade initiator caspase-8 (4hrs).

• 대한수의학회지
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• 제39권2호
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• pp.287-293
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• 1999

Isoeugenol, one of the phenylpropanoid derivatives has been known to inhibit the lipid peroxidation via scavenging effect on hydroxyl or superoxide radical production. We examined whether isoeugenol has a inhibitory effect against N-methyl-D-aspartate(NMDA)-, oxygen/glucose deprivation- and xanthine/xanthine oxidase(X/XO)-induced neurotoxicity or NMDA-induced $^{45}Ca^{+2}$ uptake elevation in primary mouse vertical cultures. We also evaluated whether isoeugenol exhibits inhibitory action on NMDA-induced convulsion in mice. Isoeugenol ($30{\sim}300{\mu}M$) attenuated NMDA- and X/XO-induced neurotoxicity by 11~85% and 83~92%, respectively. In the oxyge/glucose deprivation(60 min)-induced neurotoxicity, isoeugenol significantly(p<0.05) reduced by 32% at the maximal concentration. However, it failed to ameliorate NMDA-induced $^{45}Ca^{+2}$ uptake elevation. Isoeugenol(0.5g/kg, i.p.) delayed 6.5 times on the onset time of convulsion evoked by NMDA($0.1{\mu}g$) compared to that of control. These results suggest that the neuroprotective action of isoeugenol may be ascribed to the modulation of massive generation of reactive oxygen species(ROS) occurred during the ischemic or excitotoxic damage, not by directly affecting the NMDA receptor.

• Clinical and Experimental Pediatrics
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• 제51권12호
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• pp.1372-1372
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• 2008

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2021년도 춘계학술대회
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• pp.58-58
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• 2021

Although hypoxic/ischemic injury is thought to contribute to the incidence of Alzheimer disease (AD), the molecular mechanism that determines the relationship between hypoxia-induced β-amyloid (Aβ) generation and development of AD is not yet known. In this study, we investigated the protective effects of Acorus gramineus Soland. (AGS) on oxygen-glucose deprivation/reoxygenation (OGD/R)-induced A β production in SH-SY5Y human neuroblastoma cells. Pretreatment of these cells with AGS significantly attenuated OGD/R-induced production of reactive oxygen species (ROS) and elevation of levels of malondialdehyde, nitrite (NO), prostaglandin E2 (PGE2), cytokines (TNF-α, IL-1β and IL-6) and glutathione, as well as superoxide dismutase activity. AGS also reduced OGD/R-induced expression of the apoptotic protein caspase-3, the apoptosis regulator Bcl-2, and the autophagy protein becn-1. Finally, AGS reduced OGD/R-induced Aβ production and cleavage of amyloid precursor protein, by inhibiting secretase activity and suppressing the autophagic pathway. Although supporting data from in vivo studies are required, our results indicate that AGS may prevent neuronal cell damage from OGD/R-induced toxicity.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2021년도 춘계학술대회
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• pp.57-57
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• 2021

Oxygen glucose deprivation/re-oxygenation (OGD/R) induces neuronal injury via mechanisms that are believed to mimic the pathways associated with brain ischemia. Stachys sieboldii Miq. (Chinese artichoke), which has been extensively used in oriental traditional medicine to treat of ischemic stroke; however, the role of S. sieboldii Miq. (SSM) in OGD/R induced neuronal injury is not yet fully understood. The present research is aimed to investigate the protective effect and possible mechanisms of SSM extract treatment in an in vitro model of OGD/R to simulate ischemia/reperfusion Injury. Pretreatment of these cells with SSM significantly attenuated OGD/R-induced production of reactive oxygen species (ROS) by increasing GPx, SOD, and decreasing MDA. SSM decreased mitochondrial damage caused by OGD/R injury and inhibited the release of cyt-c from mitochondrion to cytoplasm in SH-SY5Y cells. Furthermore, neuronal cell apoptosis caused by OGD/R injury was inhibited by SSM, and SSM could decrease apoptosis by increasing ratio of Bcl-2/Bax and inhibiting caspase signaling pathway in SH-SY5Y cells. SSM demonstrated a neuroprotective effect on the simulated cerebral ischemia in vitro model, and this effect was the inhibition of mitochondria-mediated apoptosis pathway by scavenging of ROS generation. Therefore, SSM may be a promising neuroprotective strategy against ischemic stroke.