• Journal of the korean academy of Pediatric Dentistry
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• v.45 no.2
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• pp.195-202
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• 2018

The purpose of this study is to analyze the cariogenicity of vitamin supplements for children by the Caries Potentiality Index (CPI), pH drop capacity, proliferation rate of Streptococcus mutans. Four vitamin supplements were selected - Noma (NM), Cenovis Kids (CK), Animal Parade (AP), and Character Vitamin (CV). CPI value decreased in the order of AP, CV, CK, and NM. Initial values of all experimental groups showed acidity below pH 7.0. Analysis of the colony forming units of Streptococcus mutans showed that NM and CV resulted a higher proliferation rate (p < 0.05) than CK and AP (p < 0.05). Bacterial activity of the control group was lower than other groups when observed with a confocal laser scanning microscope. Considering the bacterial activity and acidity of vitamin supplements, it is necessary to pay close attention when children taken the vitamin supplements for their oral health.

• Journal of Periodontal and Implant Science
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• v.32 no.3
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• pp.589-602
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• 2002

Hyaluronic acid (HA)는 중요한 glycosaminoglycan 중 하나로서 단백질과 화학적 결합을 하지 않기 때문에 분리가 쉽고 결합조직의 세포간 기질의 주요 성분이다. 우리는 점탄성 고분자 hyaluronic acid를 실험실상에서 사람 태아 골모세포의 골 형성 과정에 미치는 영향을 알아보고자 하였다. 우리는 여러 농도의 HA에 대한 사람 태아 골모세포에서의 세포증식, 염기성 인산분해효소 활성, 석회화 결절 형성능, 교원질 합성능 그리고 bone sialoprotein (BSP)의 발현 정도를 검사하였다. 세포증식에서 각 농도의 HA 처리군과 대조군 간에 2일과 4일간의 결과에서 유의한 차이를 보이지 않았다. 염기성 인산분해효소 활성에서는 0.063% HA 처리군에서 음성 대조군에 비해 가장 유의한 염기성 인산분해효소 활성을 보였다 (p<0.05). 0.063% HA 처리군은 교원질 합성능에서도 가장 높은 수준을 보였다 (p<0.05). 석회화 결절 형성능에서는 0.063% HA 처리군에서 대조군에 비해 많은 염색된 석회화 결절을 보였다. BSP의 발현 정도를 분석한 Western blot에서는 대조군에 비해 0.063% HA 처리군에서 증가된 단백질 발현을 나타났다. 본 연구 결과 고분자 HA가 실험실상에서 사람 태아 골모세포의 분화를 통해 새로운 골 형성을 유도할 수 있는 능력이 있음을 시사하였다.

• Journal of Life Science
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• v.18 no.1
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• pp.96-102
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• 2008

Piceatannol is a polyphenol that is found in abundant quantities in grapes and wine. Although recent experimental data revealed the anti-cancer potency of piceatannol, the molecular mechanisms underlying the antileukemic activity have not yet been studied in detail. In the present study, we investigated further possible mechanisms by which piceatannol exerts its anti-proliferative action in cultured human leukemia U937 cells. Exposure of U937 cells to piceatannol resulted in growth inhibition and induction of apoptosis as measured by MTT assay and flow cytometry analysis, which was associated with S phase arrest of the cell cycle. Piceatannol treatment markedly inhibited the activity of telomerase, and the levels of human telomerase reverse transcriptase (hTERT) and telomerase-associated protein-1 (TEP-1), main determinants of the telomerase enzymatic activity, were progressively down-regulated by piceatannol treatment in a dose-dependent fashion. However, the levels of cyclooxygenases (COXs) expression and prostaglandin E2 (PGE2) release were not changed in piceatannol-treated U937 cells. Taken together, these findings provide important new insights into the possible molecular mechanisms of the anti-cancer activity of piceatannol.

• Journal of the Korean Society of Food Science and Nutrition
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• v.32 no.1
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• pp.109-114
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• 2003

Antimicrobial activities of grape seed ethanol extract and its serial solvent fractions were investigated against various food poisoning microorganisms. The grape seed ethanol extract showed dose dependant antimicrobial activity against Bacillus subtilis ATCC 9372 or Staphylococcus aureus ATCC 6538, whereas had limited effect on Pseudomonas aeruginosa IFO 3080, Salmonella enteritidis IFO 3313 and Escherichia coli ATCC 25922. Ethylacetate and butanol fractions ameng the serial solvent fractions of grape seed ethanol extract contained the catechin at the levels of 35.7 mg/g and 20.2 mg/g, respectively. Nevertheless, the butanol fraction of grape seed ethanol extract showed intense antimicrobial activity compared with the ethylacetate fraction on all microorganisms tested. It was found that the butanol fraction was mainly composed of oligomeric or polymeric polyphenols such as condensed tannins by the fractionation on C l8 cartridge according to the difference in the degree of polymerization. Therefore, it seems that the antimicrobial activity of grape seed ethanol extract is related to the degree of polymerization of proanthocyanidin as well as the total content of flavan-3-ol composing the proanthocyanidin.

• Journal of the Korean Society of Food Science and Nutrition
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• v.27 no.2
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• pp.252-258
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• 1998

The strain producing biosurfactant was isolated from soil smples. The isolated strain was identified as the genus Nocardia through its morphological, cultural and physiolgical characteristics. A high concentration of the biosurfactant by Nocardia sp. L-417 was obtained after 4 days of cultivation in the culture medium containing 3% n-hexadecane, 0.1% $NaNO_3$, 0.02% $K_2HOP_4$, 0.01% $H_2PO_4$, 0.01% $MgSO_4$.$7H_2O$, 0.01% $CaCl_2$, 0.02% yeast extract, and 0.02% tryptone. The optimum pH and temperature for biosurfactant production were pH 6.0 and $30^{\circ}C$, respectively. Furthermore, most biosurfactans were produced during the exponential growth phase, and this fact indicated that the biosurfactans production was growth-associated. The biosurfactant showed the good emulsification activities on various emulsifying substrates such as bunker A, paraffin, corn oil which are used widely in industries.

• Journal of Applied Biological Chemistry
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• v.60 no.2
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• pp.161-171
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• 2017

This study was aimed to evaluate and compare the proximate composition, antioxidant and antiproliferative activities of Sageretia thea (Osbeck) M.C.Johnst (S. thea) fruit and blueberry. The calorific value, crude protein, crude fat, crude ash, and carbohydrate were higher in S. thea fruit than in blueberry. S. thea fruit and blueberry have different profile of free sugars, in which amounts of fructose, glucose, and maltose were much higher in S. thea fruit than in blueberry. The methanol extracts of S. thea fruit contain higher amounts of total polyphenol and anthocyanin compared to those of blueberry extracts. In additions, 2,2-diphenyl-1-picrylhydrazyl (DPPH), alkyl, and 2,2'-azinobis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical scavenging activities are greater in S. thea fruit extracts. Ethyl acetate fractions and n-butanol fractions of S. thea fruit and blueberry show the most potent scavenging activity in DPPH-, alkyl-, and ABTS-radical scavenging assay. The ethyl acetate fractions of S. thea fruit and blueberry are the richest fraction in polyphenol contents while the n-butanol fractions of those are the highest fraction in anthocyanin contents. Furthermore, both S. thea fruit and blueberry extracts protect human dermal fibroblast cells against a $H_2O_2$-induced oxidative stress. The antiproliferative activities of n-hexane and chloroform fraction from S. thea fruit and blueberry were observed in AGS human gastric cancer and MDA-MB-231 human breast cancer cells. Therefore, our results suggest for the first time that the antioxidant and antiproliferative activities of S. thea fruit is comparable to that of blueberry and the nutritional value of the former is even superior to that of the latter.

• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.1
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• pp.143-148
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• 2002

We investigated the cytotoxicity effects of Lycii fructus (LF) on HePG2, MCF7 and C6 cell lines by the MTT assay. We extracted the methanol (LFM) and fractionated to five partition layers. Among partition layers, the ethylether partition layer (LFMEE) was showed the strongest cytotoxic effects on all cancer cell lines. The hexane partition layer (LFMH) also was showed significant cytotoxic activities on Hela and MCF-7 cell lines. We also determined the induction of intracellular quinone reductase (QR) activity on HepG2 cells. Among various partition layers of Lycii fructus; LFMH was showed the most effective such induced effect such as 1.85 to the control value of 1.0. And we also determined the enhancement of anticarcinogenic effect by combination of Lycii fructus with vitamin C on all cell lines. These results suggest that potentially useful anticarcinegenic chemicals could be isolated from LFMEE and LFMH of the Lycii frutus and also we found the enhanced effect by the combination of various partition layers of LFM with vitamin C.

• Journal of Life Science
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• v.22 no.1
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• pp.55-61
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• 2012

Akt is known to play an important role in cell proliferation and differentiation, and is also over-expressed in several types of cancer cells. In this study, we explored the anti-proliferative effects of selenium in HT-29 colon cancer cells, mediated through effects on Akt and COX-2. Selenium treatments at different concentrations and for different durations inhibited proliferation of HT-29 colon cancer cells and increased apoptotic cell death. Selenium treatment decreased Akt phosphorylation and COX-2 expression. Treatment with LY294002 (an Akt inhibitor) decreased proliferation of HT-29 cells, while a combined treatment with LY294002 and selenium resulted in even further decreases in cell proliferation. Inactivation of Akt by Akt siRNA treatment abolished these inhibitory effects on cell growth. COX-2 expression decreased in Akt transfected cells compared to non-transfected cells. These results suggest that selenium induced both anti-proliferative and apoptotic effects by inhibiting Akt phosphorylation and COX-2 expression. Selenium treatment also appeared to induce synergistic anti-proliferative effects by inhibition of Akt in HT-29 colon cancer cells.

• Journal of the Korean Society of Food Science and Nutrition
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• v.37 no.1
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• pp.16-19
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• 2008

Bone mass in adults decreases with age because of the imbalance between the rate of bone formation and resorption. We performed this study to investigate whether Asparagus cochinchinensis (Lour.) Merr. (ACAE) plays a role in osteoblasts differentiation and osteoclasts formation. Ethanol extract of ACAE showed increase in the differentiation and alkaline phosphatase activity of osteoblasts. Also, it decreased the number of tartrate-resistant acid phosphatase (TRAP)-positive multinucleated cells (OCLs) and TRAP activity. Therefore, ACAE has the potential to prevent bone-related diseases such as osteoporosis by increasing the differentiation of osteoblasts and reducing both the number and activity of osteoclasts.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1994.04a
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• pp.207-207
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• 1994

I) 지금까지 만성골수성백혈병의 치료법으로서 골수이식이나 인터페론의 투여등이 시행되어왔으며 백혈병세포에서 Interleukin-1$\beta$(이하 IL-1$\beta$)이 자율적으로 생성됨이 보고 되어 이러한 질병의 진행에 IL-1$\beta$의 활성증가가 관련될것이라는 견해가 대두되어 왔다. 최근 단핵구성백혈병 환자의 소변에서 분리된 IL-1수용체 길항제(1L-1 receptor antagonist: IL-lRA)가 clonig되었고 인터페론치료에 저항하는 환자들의 치료에 IL-1RA 가 이용될수 있을것이라는 견해가 있다. 따라서 본 연구는 유전공학연구소가 분리 정제한 IL-1RA가 만성골수백혈병 환자로부터 유래한 K562세포주의 증식에 미치는 영향을 평가하고 알파인터페론과의 병용투여시의 상호작용에 관해 검토하였다.