• Herbal Formula Science
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• v.12 no.2
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• pp.155-162
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• 2004

The purpose of this study is to examine the protective effect of Cynomorii herba on $H_2O_2$-induced cytotoxicity in male germ cells. The effects were studied by a modified MTT assay. Hydrogen peroxide significantly induced cytotoxicity in GC-1 spg cells, and co-treatment or pre-treatment of Cynomorii herba extract has reduced the cytotoxicity in a dose dependant manner. These results suggest that Cynomorii herba extract increases the survival rate of GC-1 spg cells through the antioxidant effect against $H_2O_2$-induced cytotoxicity.

• The Journal of Korean Medicine
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• v.22 no.1
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• pp.90-95
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• 2001

목적：인진 약침액이 SK-N-MC 신경아세포주에서 에탄올에 의해 유발된 아폽토시스에 미치는 영향을 조사하였다. 방법 : SK-N-MC cell line에서의 아폽토시스 변화를 관찰하기 위해서 MTT assay, DAPI staining 및 flow cytometric analysis 방법을 이용하였다. 결과： MTT assay를 이용하여 분석한 결과 농도에 따른 세포 독성의 효과가 에탄올 투여로부터 관찰되었다. 또한 인진 약침액으로 전처치하고 에탄올을 처치하였을 때 세포 독성이 크게 감소되었다. DAPI staining에서 인진 약침액 투여군은 에탄올 투여군에 비해서 fragmentation이 억제되었다. Flow cytometry를 통하여 인진 약침액 투여군은 에탄올 투여군에 비하여 세포주기 중 sub $G_1$ 분획의 증가가 억제되었다. 결론 : SK-N-MC 신경아세포주에서 에탄올에 의해서 유발된 아폽토시스는 전형적인 세포사별 형태를 나타내었다. 또한 인진 약침액은 에탄올에 의해서 유발된 아폽토시스에서 세포보호 효과가 있음이 확인되었다.

• Microbiology and Biotechnology Letters
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• v.32 no.1
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• pp.11-15
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• 2004

Embryonic stem (ES) cells are derived from the inner cell mass of the blastocyst-stage embryos that can be propagated indefinitely and, at the same time, can be differentiated into all the cell types that constitute the body. Current research using ES cells is mainly focused on the efficient generation of specific cell types by employing optimal differentiation conditions, which often requires the genetic manipulation of ES cells. As a way of developing an efficient system to regulate foreign gene expression in ES cells, we have inserted the gene encoding Corynebacterium diphtheria toxin-A (DTA) into an autonomously induced plasmid under positive doxycycline control ('Tet-on' system). In this study, we demonstrate that this system can lead to the cell death of mouse ES cells by the induction of DTA expression when exposed to the tetracycline derivative, doxycycline. MTT assay showed that this induction resulted in the apoptosis of ES cells.

• Microbiology and Biotechnology Letters
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• v.25 no.5
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• pp.477-482
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• 1997

To investigate the cytotoxicity of Korean traditional fermented soybean products using the MTT assay, we extracted soybean, Kanjang, Doenjang, Kochujang, and Chongkukjang with water, methanol, and hexane. Primary testing of cytotoxicity of 14 extracts was done for P388D1(mouse lympoid neoplasm) and L1210(mouse leukemia) cell lines. Doenjang methanol extract, Kochujang hexane extract, Chongkukjang methanol extract, and Chongkukjang hexane extract showed cytotoxicity of 86.1, 94.3, 83. 6, and 81.1%, respectively against P388D1, and showed cytotoxicity of 69.4, 96.9, 51.4, and 95.1%, respectively against L1210. All the other extracts showed less than 50% cytotoxicity. Methanol extracts of Doenjang and Chongkukjang showed dose-dependent cytotoxicity against P388DI, L1210, SNU-16 (human stomach cancer), HepG2(human hepatic cancer), WiDr(human colon cancer) cell lines, and IC$_{50}$ of Doenjang methanol extract was 67.7, 90.4, 1338.0, 706.4, and 371.2 $\mu$g/ml, respectively, and IC$_{50}$ of Chongkukjang methanol extract was 107.1, 228.3, 756.2, 1346.0, and 327.0 $\mu$g/ml, respectively.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.11a
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• pp.349-350
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• 2006

In this module, RED Light Emitting Diode was employed to replace for Low level He-Ne laser for medical applications Each experiment was performed to irradiation group and non-irradiation group for both Dog bone marrow and Rat tissue cells. MTT assay method was chosen to verify the cell increase of two groups and the effect of irradiation on cell proliferation was examined by measuring 590nm transmittance of ELISA reader. As a result, the cell increase of 37% on Dog bone marrow, 23% on Rat tissue cells was verified m irradiation group as compared to non-irradiation group. The fact that specific wavelength irradiation has an effect on cell vitality and proliferation is known through this study.

• YAKHAK HOEJI
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• v.52 no.4
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• pp.264-273
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• 2008

The inhibitory effect of omega-3 such as linolenic acid (LNA), docosahexaenoic acid (DNA) and eicosapentaenoic acid(EPA) on the growth of normal cell lines and cancer cell lines was evaluated by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyItetrazolium bromide (MTT) and 2,3-bis-2-methoxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-caboxanilide (XTT) methods. LNA was found to decrease the cell viability of human oral epithelioid carcinoma cells (KB) in the MTT assay, whereas EPA appeared to inhibit the cell adhesion activity of human skin melanoma cells (SK-MEL-3) in the XTT assay analysis. DPPH radical scavenging activity was examined on LNA, DHA and EPA at the concentration of 100 ${\mu}M$, where they showed about 53% scavenging activity. These results suggest that omega-3 unsaturated fatty acid has a potential anticancer activity.

• Journal of Sasang Constitutional Medicine
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• v.14 no.1
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• pp.67-78
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• 2002

Jowiseungcheongtang(JST) has been in Sasang constitution medicine for many years as a therapeutic agent for cerebral disease. But the effect of Jowiseungcheongtang(JST) on neurotoxicity is not known. The purpose of this study was to determine the effects of Jowiseungcheongtang(JST) on the hippocampal cell injured by Xanthine Oxidase/Hypoxanthine. The results were as follows: 1. XO/HX decreased the survival rate of the cultured hippocampal cells on NR assay and MTT assay. 2. JST water extract have efficacy of decreasing a amount of lipid peroxidation increased by XO/HX in cultured hippocampal cells. 3. JST water extract have efficacy of increasing DNA synthesis decreased by XO/HX in cultured hippocampal cells. From the above results, It is concluded that JST has marked efficacy in preventing cultured hippocampal cells from the damages by XO/HX.

• Journal of Acupuncture Research
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• v.22 no.6
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• pp.111-123
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• 2005

Objectives : Neurological disorders have been one of main therapeutic targets of acupuncture. The present study investigated the protective effects of Gwakhyangjeonggisan herbal acupuncture solution (GHAS). Methods : We performed 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay in glioblastoma cells, and did microarray analysis with cells exposed to reactive oxigen species (ROS) of hydrogen peroxide by 8.0 k Human cDNA, with cut-off level of 2-fold changes in gene expression. Results : MTT assay showed protective effect of GHAS on the glioblastoma cells exposed to hydrogen peroxide. When glioblastoma cells were exposed to hydrogen peroxide, 16 genes were upregulated. When the cells were pretreated with GHAS before exposure to hydrogen peroxide, 22 genes were upregulated. Most of the genes upregulated by hydrogen peroxide stimulation were reversed to downregulation by GHAS. Conclusion : The gene expression changes observed in the present study are supposed to be related to the protective molecular mechanism of GHAS in the glioblastoma cells exposed to ROS stress.

• The Korea Journal of Herbology
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• v.21 no.4
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• pp.77-84
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• 2006

Objectives : To evaluate the neuroprotective effects of modified Bo-Yang-Hwan-O-Tang (BHT), we investigated the neuronal death protection effects to oxidative damages in N2a neuroblastoma cells. Methods : To study the cytotoxic effect of BHT on N2a neuronal cells, the cell viability was determined by MTT assay. To investigate the neuronal death protection of BHT, N2a neuronal cells were induced oxidative damages by H2O2, and assayed the cell viability and DNA fragmentation. We also investigated DPPH free radical scavenging effects of BHT by tube test. Results : In MTT assay, $500{\mu}g/ml$ of BHT was not showed cytotoxic effect on N2a neuronal cells. BHT protected N2a neuronal cells from H2O2-induced cell death in a dose-dependent manner. BHT also protected N2a neuronal cells from H2O2-induced DNA fragmentation. BHT scavenged DPPH free radicals in a dose-dependent manner. Conclusion : These data suggest that BHT may have strong anti-oxidant effects through the free radical scavenging and neuroprotective effects in neuronal cells.

• The Korea Journal of Herbology
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• v.21 no.4
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• pp.85-92
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• 2006

Objectives : To evaluate the neuroprotective effects of added Bo-Yang-Hwan-Oh-Tang (BHT), we investigated the neuronal death protection effects to oxidative damages in SH-SY5Y neuronal cells. Methods : To study the cytotoxic effects of BHT on SH-SY5Y cells, the cell viability was determined by MTT assay. To investigate the neuronal death protection of BHT, SH-SY5Y cells were induced oxidative damages by $H_2O_2$ and then assayed the cell viability and DNA fragmentation. We also investigated DPPH free radical scavenging effect of BHT by tube test. Results : In MTT assay, $1000{\mu}g/ml$ of BHT was not showed the cytotoxic effect on SH-SY5Y cells. BHT protected SHSY5Y cells from $H_2O_2-induced $ neuronal cell death in a dose-dependent manner. BHT also protected SH-SY5Y cells from $H_2O_2-induced$ DNA fragmentation. BHT effectively scavenged DPPH free radicals in a dose-dependent manner. Conclusion : These data suggest that BHT may have strong antioxidant effects through the free radical scavenging and neuroprotective effects in human neuronal cells.