• 생명과학회지
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• 제23권1호
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• pp.84-94
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• 2013

커피와 유사한 향미기를 갖는 녹차(Coffee-like green tea: CLGT)를 제조하고 이의 인체 유방암세포 주 MCF-7, 인체 전립선암세포 주 PC-3, 인체 신경모세포 주 SK-N-SH 및 쥐 심근세포 주 H9c2에 대한 세포독성을 연구하였다. 녹차엽(GTL)을 $240^{\circ}C$에서 1시간 roasting한 녹차가 커피와 가장 유사한 향미를 나타내었다. CLGT는 GTL과 비교하여 인체 암세포 및 정상세포와 쥐 심근세포에 대한 세포독성 차이가 없었다. GTL의 roasting은 ECG 등의 catechin 성분과 total protein은 유의성 있게 감소시켰지만, total phenol 및 total sugar는 유의성 있는 감소시키지 않아, 이와 같은 화합물 조성의 변화가 GTL에 커피유사 향미를 제공하였을 것이다. 따라서 이들 결과는 CLGT이 인체에 안전하여 커피 대용품으로 사용할 수 있음을 의미한다.

• 약학회지
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• 제54권2호
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• pp.112-121
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• 2010

The cytotoxic activity of 33,4,5-trihydroxybenzoic acid methylester and related compounds on the growth of normal cell lines, human skin melanoma cells and human oral epithelioid cell line were evaluated by the 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) and 2,3-bis-[2-methoxy-4-nitro-5-sulfo-phenyl]-2-H-tetrazolium-5-caboxanilide (XTT) methods. 3,4,5-Trihydroxybenzoic acid methylester decreased the cell viability of human skin melanoma cells and human oral epithelioid cells shown by the MTT method and the cell adhesion activity of human skin melanoma cells and human oral epithelioid cells shown by the XTT method. In light microscopy, 100 ${\mu}M$ 3,4,5-trihydroxybenzoic acid methylester showed the highest cytotoxic activity. These results suggest that 3,4,5-trihydroxybenzoic acid methylester has a potential anticancer activity.

• Natural Product Sciences
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• 제24권4호
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• pp.219-224
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• 2018

During the screening for cytotoxic compounds from plants grown in Korea, Betula platyphylla (BP) showed potent activity against the adenocarcinomic human alveolar basal epithelial A549 cell line. To identify the cytotoxic components from BP, the $CH_2Cl_2$ fraction with the most significant cytotoxic effect was applied to the column chromatographies. Seven compounds were isolated: lupeol (1), betulinic acid (2), (-)-rhododendrol (3), platyphyllenone (4), platyphyllone (5), (-)-centrolobol (6), and oleanolic acid (7). Among them, three diarylheptanoids (4 - 6) exhibited cytotoxicity toward A549 cells. Especially, $50{\mu}M$ of 4 reduced A549 cell viability to $18.93{\pm}0.82%$ compared to control ($100.00{\pm}21.48%$). Lactate dehydrogenase (LDH) leakage and intracellular reactive oxygen species (ROS) production were also induced by $50{\mu}M$ 4. This is the first report on the cytotoxic effect of BP-derived diarylheptanoids 4-6 against A549 cells. The compound 4 may be useful for the development of early hit compounds for non-small cell lung carcinoma, but the consideration about selectivity of 4 is required since 4 also showed the cytotoxicity in the human normal lung epithelial BEAS-2B cell line.

• Food Science and Biotechnology
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• 제18권3호
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• pp.749-754
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• 2009

The polysaccharide (BB-pol) extracted from Bifidobacterium bifidum BGN4 showed growth inhibitory effects on several colon cancer cell lines such as HT-29 and HCT-116. To increase the yield of polysaccharide, B. bifidum BGN4 was cultured in various culture media with different compositions. When B. bifidum BGN4 was cultured in modified MRS broth containing phytic acid, the cells showed increased branch formation and enlarged morphology. The content of total carbohydrate and the ability of adhesion to intestinal epithelial cells were also increased by phytic acid. The polysaccharide obtained from the cells grown in the presence of phytic acid inhibited the proliferation of cancer cell lines such as HT-29 and MCF-7 cells but not normal colon cell line, FHC. Taken together, Bifidobacterium grown in the presence of phytic acid may confer enhanced beneficial function for the host.

• 약학회지
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• 제49권5호
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• pp.365-369
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• 2005

The inhibitory effect of ferulic acid and related phenolic compounds on the growth of normal cell lines and can­cer cell line was evaluated by the MTT and XTT methods. Ferulic acid decreased the cell viability of human skin melanoma cells by the MTT method and the cell adhesion activity of human oral epithelioid carcinoma cells by the XTT method. These results suggest that ferulic acid has a potential anticancer activity.

• 한국발생생물학회지:발생과생식
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• 제18권4호
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• pp.225-231
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• 2014

Autophagy is a homeostatic degradation process that is involved in tumor development and normal development. Autophagy is induced in cancer cells in response to chemotherapeutic agents, and inhibition of autophagy results in enhanced cancer cell death or survival. Chloroquine (CQ), an anti-malarial drug, is a lysosomotropic agent and is currently used as a potential anticancer agent as well as an autophagy inhibitor. Here, we evaluate the characteristics of these dual activities of CQ using human colorectal cancer cell line HCT15. The results show that CQ inhibited cell viability in dose- and time-dependent manner in the range between 20 to 80 uM, while CQ did not show any antiproliferative activity at 5 and 10 uM. Cotreatment of CQ with antitumor agent NVP-BEZ235, a dual inhibitor of PI3K/mTOR, rescued the cell viability at low concentrations meaning that CQ acted as an autophagy inhibitor, but CQ induced the lethal effect at high concentrations. Acridine orange staining revealed that CQ at high doses induced lysosomal membrane permeabilization (LMP). High doses of CQ produced cellular reactive oxygen species (ROS) and cotreatment of antioxidants, such as NAC and trolox, with high doses of CQ rescued the cell viability. These results suggest that CQ may exert its dual activities, as autophagy inhibitor or LMP inducer, in concentration-dependent manner.

• 약학회지
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• 제31권5호
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• pp.253-265
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• 1987

To develop hybridomas secreting monoclonal antibodies to be used as unlimited sources of reagents indispensable for the diagnosis and treatement of leukemic malignancy, a monoclonal antibody was generated to human pre-T leukemia cells (Jurkat). Hybridomas were produced against Jurkat cell line by fusing spleen cells from hyperimmunized mice with murine plasmacytoma cells (P3$\times$63Ag8. V653). One monoclonal antibody derived from this fusion, designated DMJ-2 was reactive with T-cell lines (Jurkat, Molt-4 and RPMI-8402) and normal peripheral E-rosette forming T cells, but unreactive with B-cell lines (Daudi, Nalm-6) and non-T, non-B cell line (K562). Conclusively DMJ-2 reactive with mature and immature T-lineage lymphoid cells.

• 생명과학회지
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• 제34권6호
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• pp.365-376
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• 2024

이 연구는 여러 종류의 암세포주(A-549, AGS, HCT-116, MDA-MB-231 및 U 87-MG)와 정상세포주(MRC-5 및 MSC)에 RNA를 DNA로 전환시킬 수 있는 역전사 효소의 억제 처리 후 세포의 성장에 미치는 영향을 비교 조사하였다. 각 세포주에 efavirenz (EFA) 역전사 효소 억제제를 1주일 동안 처리하였을 때, 세포 성장의 반억제농도(IC₅₀) 값은 암세포주보다 정상세포주에서 더 높은 값을 나타냈다. 결정된 IC₅₀ 값에 따라 15 µM 농도로 EFA를 1주일 동안 처리하였을 때, 역전사 효소 및 말단소립 복원 효소의 활성은 EFA 처리군에서 비처리군에 비하여 유의적으로(p<0.05) 감소하였다. 그러나, 역전사 효소 및 말단소립 복원효소의 활성은 정상세포주에서는 검출되지 않았다. 15 µM EFA를 처리한 후, 암세포주와 정상세포주에서 세포성장율을 비교하였을 때, EFA 처리는 모든 세포의 성장을 억제하였는데, 정상세포주보다 암세포주에서 세포의 성장율이 현저하게(p<0.05) 감소하였다. 또한, 역전사 효소의 억제가 세포의 노화 및 사멸에 미치는 영향을 분석하기 위해 노화 관련 ß-galactosidase 효소의 활성을 분석하였을 때, EFA 처리가 노화관련 효소 활성이 점점 증가하는 것으로 보아, EFA 역전사 효소의 처리는 세포 노화 및 세포 사멸을 유도하는 것을 알 수 있었다. 이상의 결과를 바탕으로, 역전사 효소의 억제는 정상세포보다는 암세포의 성장을 더 억제하는 것을 알 수 있었지만, 항암치료 등에서 응용되기 위해서는 세포에서 역전사 효소의 기능과 역할에 대해서는 좀 더 심도있는 연구가 필요할 것으로 생각된다.

• International Journal of Oral Biology
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• 제34권2호
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• pp.61-72
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• 2009

Chios gum mastic (CGM) is a resin produced from the stem and leaves of Pistiacia lentiscus L var chia, a plant which grows only on Chios Island in Greece. CGM has been used for many centuries as a dietary supplement and folk medicine for stomach and duodenal ulcers in many Mediterranean countries and is known also to induce cell cycle arrest and apoptosis in some cancer cells. In this study, we further investigated the induction and mechanisms underlying the apoptotic response to CGM treatment in the SCC25 human tongue squamous cell carcinoma cell line. The viability of SCC25 cells, human normal keratinocytes (HaCaT cells) and human gingival fibroblasts (HGF-1 cells), and the growth inhibition of SCC25 cells were assessed by MTT assay and clonogenic assay, respectively. Staining with Hoechst and hemacolor dyes and TUNEL assays were employed to detect SCC25 cells undergoing apoptosis. SCC25 cells were treated with CGM, and this was followed by western blotting, immunocytochemistry, confocal microscopy, FACScan flow cytometry, MMP activity and proteasome activity analyses. CGM treatment of SCC25 cells was found to result in a time- and dosedependent decrease in cell viability, a dose-dependent inhibition of cell growth, and apoptotic cell death. Interestingly, CGM showed a remarkable level of cytotoxicity in SCC25 cells but not in normal cells. Tested SCC25 cells also showed several lines of apoptotic manifestation. Taken together, our present findings demonstrate that CGM strongly inhibits cell proliferation by modulating the expression of G1 cell cycle-related proteins and induces apoptosis via the proteasome, mitochondria and caspase cascades in SCC25 cells.

• Food Science and Biotechnology
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• 제15권3호
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• pp.458-461
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• 2006

To determine whether the toxicity of Bacillus cereus would be seen in human cell lines and mice, we screened B. cereus B-38B, B. cereus B-50B, and B. cereus KCCM40935 for genes that coded for 5 enterotoxins using the polymerase chain reaction and cultivated them for 17 hr, by whose time they had grown to $10^7-10^8$ colony-forming units (CFU) per milliliter. Cell-free supernatant was added to make up 1% of the total reaction solution. Human cells from normal lung, lung carcinoma, embryonic kidney, and cervical adenocarcinoma cell lines were grown in culture. The cytotoxicity induced by adding the reaction solution was indicated by cell death rates of 0 to 70%, depending on the bacterial strain involved and the cell line. A lethality of 20% was observed when B. cereus cultures containing $10^7-10^8$ viable cells were administrated orally to mice. Therefore, the culture of B. cereus containing $10^7-10^8$ viable cells seems to have high cytotoxicity on human cell lines and lethality on mice.