• Journal of Sasang Constitutional Medicine
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• v.14 no.1
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• pp.79-89
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• 2002

To evaluate the effect of Yuldahansotang(YHT) water extract on cultured hippocampal cell was inhibited by hydrogen peroxide, MTT assay, NR assay, Neurofilament enzymeimmuno assay and DNA synthesis assay were carried out after the cultured hippocampal cells were preincubated with various concentrations of YHT water extract for 3 hours prior to exposure of hydrogen peroxide. The results obtained were as follows: 1. Hydrogen Peroxide decreased the survival rate of the cultured hippocampal cells on NR assay and MIT assay. 2. YHT water extract have efficacy of increasing a amount of neurofilament decreased by hydrogen peroxide in cultured hippocampal cells. 3. YHT water extract have efficacy of increasing DNA synthesis decreased by hydrogen peroxide in cultured hippocampal cells. From above the results, It is concluded that YHT has marked efficacy in preventing for the damages by hydrogen peroxide.

• Korean Journal of Environmental Biology
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• v.28 no.1
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• pp.8-13
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• 2010

This study aimed the role of gold nanoparticles (AuNP) in advanced glycation end-products (AGEs) induced migration and invasion in bovine retinal endothelial cells (BRECs). BRECs were isolated from the retina. Cell viability was confirmed by the MTT assay. In vitro wound migration assay was performed to investigate the migration of BRECs. In vitro tube formation was measured by on-gel system. Apoptosis induced by AuNP was confirmed by caspase-3 assay. AGE-bovine serum albumin (BSA) demonstrated increase of cell migration and proliferation in BRECs. In addition, AuNP regardless of the existence of AGE-BSA suppressed proliferation, migration, and angiogenesis. AuNP suppressed AGE-BSA induced migration and invasion, and induced apoptosis through caspase-3. As a results, AuNP have a potential anti-angiogenic effect for AGE-induced angiogenesis in vitro and offer possibility for the treatment of diabetic retinopathy.

• Journal of Korean Medicine Rehabilitation
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• v.19 no.1
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• pp.187-199
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• 2009

Objectives : The electroacupuncture was generally has been used in oriental medicine doctors. In recent years, there have been a few studies about safety and stability of acupuncture needle in itself, but then again research of acupuncture needle safety and stability on applying electroacupuncture have been insignificant. Therefore we investigated the safety and change in mechanical characteristic of acupuncture needle in electroacupuncture therapy. Methods : We observed mechanical characteristic change by SEM(Scanning Electron Microscope) and EDX(Energy Dispersive X-ray Spectroscopy), evaluated the hardness by vickers hardness tester. We used MTT assay and cell stain to study about biocompatibility of electroacupuncture. Results : In this study, any corrosion of material, alternation of elements, and change of hardness were not observed in surface analysis using SEM and EDX. In cytotoxity evaluation using MTT assay and cell stain, cell survival rate was low when practicing the electroacupuncture for more than 3 hours. Conclusions : Change of mechanical property was not observed based on the test results using surface analysis and hardness estimation by the electroacupuncture. And considering the biocompatibility, electroacupuncture was thought to be safe in an hour based on cytotoxity evaluation using MTT assay and cell stain.

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.2
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• pp.287-290
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• 2004

This study was desinged to investigate the cytotoxic effect of ethanonl extract of radish, Raphanuse sativus on human lung cancer cell lines (A-549) using MTT(3-〔4,5-dimethylthiazol-2-yl〕-2-yl)-2,5-diphenyltetrazolium bromide) assay. Radish trunk and radish root were extracted by a mixed solvent of water and ethanol (5 : 5, v/v) after drying, The extracts were used for anticancer activity assay. $IC_{50}$/ (50% inhibitory concentration) of radish trunk and radish root were 0.015% and 0.03%, respectively. Radish trunk extract showed higher anticancer activity than radish root extract at the same concentration of 0.01％.

• Toxicological Research
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• v.13 no.3
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• pp.251-256
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• 1997

Toluene inhalation increases glutamate level and its receptor in various brain regions. In this study, nitric oxide synthase (NOS) activities were investigated in various rat brain regions using NADPH diaphorase staining method which examined histochemical changes of NOS in the neural cells. Also, in vitro LDH leakage assay and MTT test were performed to investigate the toxic influences of toluene in cultured granule cell of rat cerebellum which was significantly affected with toluene in vivo. Rats were exposed to toluene of 10000 ppm for 3 days. 7 days and 14 days by 20 min $\times$ 2 times a day. NADPH diaphorase staining was processed in the different brain regions after inhalation. NADPH diaphorase staining density was not significantly changed at 3 days inhalation group, but the density decreased in proportion to the duration of toluene inhalation. Over 30% of staining density was decreased at 14 days group which was maximum duration of inhalation in this study. The tendency of staining density decrease was significant in granule cell of cerebellum. Cell death by toluene exposure was observed in cultured cerebellar granule cell. $EC_{50}$ measured with LDH leakage assay and MTT test were 43 mM and 72 mM respectively.

• Journal of Physiology & Pathology in Korean Medicine
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• v.16 no.3
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• pp.553-556
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• 2002

To study the effects of Scorpio on oxygen free radical-mediated damage by xanthine oxidase/hypoxanthine (XO/HX) on cultured spinal sensory neurons, in vitro assays such as MTT assay were used in cultured spinal sensory neurons derived from mice. Spinal sensory neurons were cultured in media containing various concentrations of XO/HX for 6 hours, after which the neurotoxic effect of XO/HX was measured by in vitro assay. The protective effect of the herb extract, Scorpio water extract against XO/HX-induced neurotoxicity was also examined. The results are as follows : In MTT assay, XO/HX significantly decreased the cell viability of cultured mouse spinal sensory neurons according to exposure concentration and time in these cultures. The effect of Scorpio water extract on XO/HX-induced neurotoxicity showed a quantitative increase in neurdfilament. These results suggest that XO/HX has a neurotoxic effect on cultured spinal sensory neurons from mice and that the herb extract, Scorpio water extract, was very effective in protecting XO/HX-induced neurotoxicity.

• The Korea Journal of Herbology
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• v.21 no.2
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• pp.121-127
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• 2006

Objectives : Nickel is a major metal used in the nickel-chromium alloys of most orthodontic appliances, partial denture and implants. This study was carried out for the examination of the cytotoxicity on nickel sulfide in cultured NIH3T3 fibroblasts, and poncirin effect on nickel-induced cytotoxicity. Methods : Cell viability for the MTT assay and cell adhesion activity for the XTT assay. Results : The $IC_{50}$ of nickel sulfide by the MTT assay was $93.7\;{\mu}M$. Poncirin was significantly increased the cell viability and cell adhesion activity. Conclusion : Nickel was highly toxic and poncirin has the inhibitory effects against nickel induced cytotoxicity.

• The korean journal of orthodontics
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• v.34 no.4 s.105
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• pp.351-362
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• 2004

Orthodontic band cements are widely used in the fields of orthodontics, but they are commonly known as cytotoxic material. Within an oral cavity several ions and components are released from orthodontic band cements, thus causing inflammation or injury to the Periodontal tissue. Therefore, it is very important to estimate the biocompatibility of orthodontic band cements. The purpose of this study was to assess the cytotoxic effect of orthodontic band cements to HGF cells. A zinc phosphate cement, a glass ionomer, a resin modified glass ionomer, and compomer were used to evaluate three cytotoxicity assays: cell proliferation assay, MTT assay, and agar ovelay assay The results were as follows: 1. In the cell proliferation assay, Gl>ZPC, RMGI, RMGI24, GI24>compomer24, ZPC24, compomer>metal ring lined up in order of cytotoxicity 2. In the MTT assay, GI>ZPC, RMGI>GI24>ZPC24, compomer, metal ring, RMGI24, compomer24 lined up in order of cytotoxicity. 3. In the agar overlay test, GI>GI24, ZPC, ZPC24, RMGI>RMGI24, compomer, compomer24, metal ring lined up in order of cytotoxicity.

• Journal of Life Science
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• v.29 no.11
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• pp.1192-1199
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• 2019

The intention of this study was to confirm the possible use of an ethanol extracts of Nelumbinis Rhizomatis Nodus (NRN) as a cosmetic material. To this end, we extracted NRN with 70% ethanol and performed biological activity evaluation of whitening efficacy and wrinkle reduction. We performed cellular tyrosinase inhibition and melanin contents assay to check the whitening activity of NRN and carried out a toxicity evaluation of NRN via an MTT assay and the amounts of associated proteins that affect melanin production in a melanoma cell line (B16F10). And collagenase inhibitory assay was performed for the evaluation of anti-wrinkle of samples. In addition, a toxicity evaluation using an MTT assay and matrix metalloprotease (MMP-1) and procollagen synthesis inhibition by NRN were evaluated in a fibroblast cell line (CCD-986sk). Western blot results for the whitening activity evaluation revealed that the levels of two proteins related to melanin production, tyrosinase-related protein-1 (TRP-1) and tyrosinase-related protein-2 (TRP-2), were decreased in a dose-dependent manner. Moreover, collagenase inhibition activity at a concentration of $500{\mu}g/ml$ NRN by measuring epigallocatechin-3-gallate (EGCG) was increased by more than 80% compared to the control group. Meanwhile, procollagen synthesis was reduced by 68.8% in the UVB-induced CCD- 986sk cells group whereas collagen synthesis recovered by 80.2% with $25{\mu}g/ml$ NRN. The MMP-1 expression rate showed 20.2% reduction at $25{\mu}g/ml$. The results of the experiments verified the whitening and wrinkle suppression effects of NRN and confirmed that it could be used as a safe natural cosmetic material in the future.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.10a
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• pp.74-74
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• 2019

The aim of the study was to determine the antioxidant activities of the plants with origin of the Far East. The Carlemannia tetragona Hook f., which is a species of plant in the family Carlemanniaceae and Celastrus virens which is a species of plant in the family Celastraceae were tested for antioxidant activities. Samples were prepared using 95% ethanol using DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate free radical) assay for assessing the antioxidant activity. Ascorbic acid was used for positive control for DPPH assay. DPPH assay experiment showed that extracts of the Carlemannia tetragona Hook. f., and Celastrus virens might have anti-oxidant activity 54.5% and 258% higher, respectively, compared to control. To determine the cell toxicity of these plant extracts, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay was used. MTT assay experiment showed that Carlemannia tetragona Hook. f., and Celastrus virens might have less toxicity 23.3% and 27.5%, respectively, compared to control. Taken together, these experiments showed that Celastrus virens extracts might have much higher antioxidant activities than Carlemannia tetragona Hook. f., with relatively lower toxicity. This implies that this study might provide a basis to develop a new powerful antioxidant candidate for human diseases therapeutics.