• Asian Pacific Journal of Cancer Prevention
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• 제17권3호
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• pp.957-963
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• 2016

Cellular senescence, a barrier to tumorigenesis, controls aberrant proliferation of cells. We here aimed to investigate cellular senescence in immortalized cholangiocyte and cholangiocarcinoma cell lines using five different inducing agents: 5-aza-2'deoxycytidine, bromodeoxyuridine, interferons ($IFN{\beta}$ and $IFN{\gamma}$), and hydrogen peroxide. We analyzed senescence characteristics, colony formation ability, expression of genes involved in cell cycling and interferon signaling pathways, and protein levels. Treatment with all five agents decreased cell proliferation and induced cellular senescence in immortalized cholangiocyte and cholangiocarcinoma cell lines with different degrees of growth-inhibitory effects depending on cell type and origin. Bromodeoxyuridine gave the strongest stimulus to inhibit growth and induce senescence in most cell lines tested. Expression of p21 and interferon related genes was upregulated in most conditions. The fact that bromodeoxyuridine had the strongest effects on growth inhibition and senescence induction implies that senescence in cholangiocarcinoma cells is likely controlled by DNA damage response pathways relating to the p53/p21 signaling. In addition, interferon signaling pathways may partly regulate this mechanism in cholangiocarcinoma cells.

• 동의생리병리학회지
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• 제19권1호
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• pp.124-129
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• 2005

Resveratrol, a phytoalexin found at high levels in grapes and in grape products such as red wine, has been reported to possess a wide range of biological and pharmacological activities including anti-oxident, anti-inflammatory, anti-mutagenic, and anti-carcinogenic effects, but its molecular mechanism is poorly understood. In this study, we examined the effects of resveratrol on lipopolysaccharide (LPS)-induced growth inhibitory activity and cell growth-regulatory gene products in astroglioma C6 cells to elucidate its possible mechanism for anti-cytotoxicity. It is shown that LPS induced time-dependent growth inhibition and morphological changes of C6 cells, which were recovered by pre-treatment with resveratrol. The anti-proliferative effect of LPS was associated with the induction of tumor suppressor p53 and cyclin-dependent kinase (Cdk) inhibitor p21 (WAF1/CIP1) expression assessed by RT-PCR and Western blot analysis in time-dependent manner in C6 cells. In addition, the pro-apoptotic Bax expression was also up-regulated in LPS-treated C6 cells without alteration of anti-apoptotic Bcl-2 and Bcl-XL expression. However, resveratrol significantly inhibited LPS-induced p53, p21 and Bax levels, suggesting that the modulation of p53, p21 and Bax levels could be one of the possible pathways by which resveratrol functions as anti-cytotoxic agent.

• 한국잡초학회지
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• 제17권4호
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• pp.407-412
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• 1997

약용작물의 allelopathy 효과를 구명하기 위하여 메탄올 추출물을 이용하여 생물검정한 결과 피의 발아, 신초 및 뿌리생육 억제는 공시식물, 사용부위, 사용농도에 따라 다르게 나타났는데 피의 발아, 신초 생장 및 뿌리는 천궁 및 감초 뿌리추출물에 의해서 가장 억제가 되었다. 1g 농도에서 피의 발아, 신초생장, 뿌리생장이 각각 88%, 95%, 100%, 감초추출물에서 87%, 96%, 100% 억제되었다. 천궁의 부위별 억제정도는 뿌리에서 가장 크게 나타났는데 0.5g에서 피는 완전히 억제가 되었으나 줄기 잎추출물에서는 억제효과가 크지 않았다. 용매극성별 피의 억제 정도는 에틸아세테이트에서 가장 크게 억제되었다. 피의 발아는 3분획 모두 억제가 되지 않았으나 신초 및 뿌리생장은 에틸아세테이트분획이 에틸에테르나 메탄올 분획보다 억제가 더 컸다. 이상의 결과에서 천궁뿌리에 함유하고 있는 allelochemicals은 중간정도의 극성을 띤 물질일 것으로 사료되며 allelochemicals의 분리정제에 귀중한 재료가 될 것으로 사료된다.

• Archives of Pharmacal Research
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• 제28권11호
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• pp.1270-1274
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• 2005

The vascular endothelial growth factor (VEGF) plays a key role in angiogenesis, which is a process where new blood vessels develop from the endothelium of a pre-existing vasculature. VEGF exerts its activity by binding to its receptor tyrosine kinase, KDR/Flk-1, which is expressed on the surface of endothelial cells. A methanol extract and organic solvent (n-hexane, ethyl acetate, n-butanol, aqueous) fractions from Rubus coreanus were examined for their inhibitory effects on VEGF binding to the VEGF receptor. The methanol extract from the crude drug were found to significantly inhibit VEGF binding to the VEGF receptor ($IC_{50}$$\thickapprox$27 $\mu$g/mL). Among the fractions examined, the aqueous fraction from the medicinal plant showed potent inhibitory effects against the binding of KDR/Flk-1-Fc to immobilized $VEGF_{165}$ in a dose­dependent manner ($IC_{50}$$\thickapprox$11 $\mu$g/mL). Sanguiin H-6 was isolated as an active principle from the aqueous fraction, and inhibited the binding of KDR/Flk-1-Fc to immobilized $VEGF_{165}$ in a dose­dependent manner ($IC_{50}$$\thickapprox$0.3 $\mu$g/mL). In addition, sanguiin H-6 efficiently blocked the VEGF­induced HUVEC proliferation in a dose-dependent manner ($IC_{50}$$\thickapprox$7.4 $\mu$g/mL) but had no effect on the growth of HT1080 human fibrosarcoma cells. This suggests that sanguiin H-6 might be a potential anti-angiogenic agent.

• 한국식품과학회지
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• 제23권3호
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• pp.370-374
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• 1991

마늘의 돌연변이유발 억제효과와 사람의 HT-29 결장암 세포의 성장저해 효과에 대하여 검토하였다. 마늘의 메탄올 추출물은 김치 제조시 사용되는 첨가농도 2%에서 아플라톡신 $B_1(AFB_1)$과 MNNG에 대해 항돌연변이적 효과를 나타내었다. 이 메탄올 추출물의 농도를 증가시켰을 때 Salmonella typhimurium TA98과 TA100에서 모두 $AFB_1$에 대하여 돌연변이유발 억제효과가 증가되었다. 이를 다시 분획하였을 때 비극성 분획인 클로르포름 분획에서 더 큰 돌연변이유발 억제효과를 관찰할 수 있었다. 또한 마늘의 클로르포름 분획은 사람의 HT-29 결장암 세포의 성장을 FBS 농도 1%와 5%에서 각각 저해하였다.

• The Korean Journal of Ecology
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• 제12권3호
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• pp.161-170
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• 1989

To verify allelopathic effects of Artemisia princeps var. orientalis, a number of laboratory experiments have been performed. Aqueous extracts of leaves, stems and roots of the above species inhibited the seed germination and seedling growth of experimental species, receptor plants. In general, the higher was the concentration of the extracts, the lower was the germination and the growth ratio. Volatile substances released from leaves of the donor plants also inhibited the seed germination and the radicle elongation of receptor plants. Therefore, to find out the inhibitory substances emitted from the wormwood, gas chromatography was employed. As a result of the analysis, 17 KDICical substances were isolated from the leaves and most of them were identified as phenolic compounds.

• 한국작물학회지
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• 제48권4호
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• pp.303-307
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• 2003

Some Compositae plants are known to contain biologically active substances that are allelopathic to weeds species as well as antioxidant to foods. Aqueous extracts from leaves of 3 plant species, Cirsium japonica, Kalimeris yomena, and Lactuca saliva, were bioassayed against alfalfa (Medicago saliva) to determine their allelopathic effects. The extracts applied on filter paper in bioassay significantly inhibited root growth of alfalfa. Extracts of 20 g dry tissue $\textrm{L}^{-1}$ from Lactuca sativa showed the most inhibitory effect on alfalfa seedling growth and followed by Cirsium japonica and Kalimeris yomena. Oxidative stability by Rancimat method and antioxidant activity by TBA method for the ground samples were the greatest in Lactuca sativa although were less than that of a commonly used antioxidant, 1% ascorbic acid. Antioxidant activity of methanol extracts on storing meat was stably kept for 28days and was excellent compared to control. These results suggest that three Compositae plants have potent allelopathic and antioxidant effects, and that their activities differ, depending on plant species.

• 한국미생물·생명공학회지
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• 제25권5호
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• pp.442-447
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• 1997

To development food preservative, antimicrobial activities of Schizandra chinensis (SC) against Listeria monocytogenes Scott A, L. monocytogenes Brie I and L. monocytogenes ATCC 19111 were investigated. The growth of L. monocytogenes Scott A, L. monocytogenes Brie I and L. monocytogenes ATCC 19111 was inhibited apparently in Tryptic Soy Broth (TSB) containing 1% SC at 35$\circ$C and it was found that these had antibacterial effects against a broad spectrum of pathogenic bacteria such as S. aureus ATCC 29737, B. subtilis KCTC 1021, E. coli ATCC 11775. The growth of L. monocytogenes was also inhibited about 3 to 5 log$_{10}$ cycle by 0.1% of three fractions of the alcohol extract such as ether, ethyl acetate and butanol. Acidic, weakly acid and neutral fraction of ether fraction showed inhibitory properties against L. monocytogenes.

• International Journal of Oral Biology
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• 제35권4호
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• pp.203-207
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• 2010

A number of bacterial species coexist in oral cavities as a biofilm rather than a planktonic arrangement. By forming an oral biofilm with quorum sensing properties, microorganisms can develop a higher pathogenic potential and stronger resistance to the host immune system and antibiotics. Hence, the inhibition of biofilm formation has become a major research issue for the future prevention and treatment of oral diseases. In this study, we investigated the effects of pentose on biofilm formation and phenotypic changes using wild type oral bacteria obtained from healthy human saliva. D-ribose and D-arabinose were found to inhibit biofilm formation, but have no effects on the growth of each oral bacterium tested. Pentoses may thus be good candidate biofilm inhibitors without growth-inhibition activity and be employed for the future prevention or treatment of oral diseases.

• 한국식품영양과학회지
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• 제27권2호
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• pp.239-243
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• 1998

The growth of pathogens such as Staphylococcus aureus ATCC 29737, Bacillus subtilis KCTC 1021 and Escherichia coli ATCC 11775 was inhibited as much as 1 to 4 log cycles in tryptic soy broth containing 1% of Schizandra chinensis extract but Salmonella tuphimrium ATCC 14028 and Vibrio parahaemolyticus ATCC 17802 were not inhibited. The essential oil of Schizandra chinensis showed stronger inhibitory activity than ethanol extract against above menioned pathogens. The growth of Listeria monocytogenes was not changed in minced pork containing 1% of Schizandra chinensis extract for 12 days at 4$^{\circ}C$. The sensory quality of hamburger patty such as taste, flavor and overall accepability were not decreased by the addition of 1% Schizandra chinensis extract(p<0.05).