• 생명과학회지
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• 제20권4호
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• pp.623-631
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• 2010

노루궁뎅이는 담자균문, 민주름버섯목, 산호침버섯과에 속하는 식의약용버섯으로 예로부터 위궤양이나 위암의 치료에 효과가 있으며 생쥐의 Sarcoma 180과 Ehrlich Sarcoma에도 효과가 있다고 알려져 왔다. 노루궁뎅이의 자실체로부터 중성염용액, 열수 및 메탄올 등을 이용하여 조다당류를 추출하고 ICR mice에 주사하여 항암 및 면역증강 효과를 조사하였다. Sarcoma 180, HepG2, HT-29, NIH3T3 등의 세포에 대한 세포독성을 조사한 결과 $10{\sim}2,000\;{\mu}g/ml$의 조다당류 농도에서 각각의 암세포는 세포독성을 거의 나타내지 않았다. Sarcoma 180으로 접종된 ICR mouse에 자실체에서 추출한 각각의 조다당류를 투여한 실험군은 대조군에 비해 수명이 각각 29.1~54.1% 연장되었다. 노루궁뎅이 자실체를 중성염 용액으로 추출한 조다당류는 $50\;{\mu}g/ml$의 농도에서 비장세포의 수를 2.9배 증가시켰으며 또한 중성염 추출 조다당류를 $200\;{\mu}g/ml$의 농도로 투여한 실험군 생쥐의 B 임파구 alkaline phosphatase의 활성은 대조군에 비해 5.5배의 증가하였다. 중성염 용액 추출 조다당류를 50 mg/kg body weight의 농도로 투여한 실험군 생쥐의 총 복강 세포 수와 백혈구의 수는 대조군에 비하여 각각 4배와 2.3배로 증가하였다. 또한 면역 관련 장기인 간, 비장 및 흉선의 체중에 대한 무게 비율은 대조군에 비하여 유의성을 보이지 않았다. 따라서 노루궁뎅이의 자실체에서 추출한 조다당류는 생쥐의 면역을 증강시키고 생쥐의 Sarcoma 180에 대해 항암효과를 나타내었다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권18호
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• pp.7857-7861
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• 2014

Natural killer (NK) cells play an important role in anti-tumor immunity. Interleukin (IL)-18 is an immunoregulatory cytokine that induces potent NK cell-dependent anti-tumor responses when administrated with other cytokines. In this study, we explored the effects of combining IL-18 and IL-2 on NK cytotoxicity as well as expression levels of the NK cell receptor NKG2D in vitro. Freshly isolated PBMCs were incubated for 48 h with IL-18 and IL-2, then CD107a expression on $CD3^-CD56^+$ NK cells was determined by three-colour flow cytometry to evaluate the cytotoxicity of NK cells against human erythroleukemia K562 cells and human colon carcinoma HT29 cells. Flow cytometric analysis was also employed to determine NKG2D expression on NK cells. The combined use of IL-18 and IL-2 significantly increased CD107a expression on NK cells compared with using IL-18 or IL-2 alone, suggesting that the combination of these two cytokines exerted synergistic enhancement of NK cytotoxicity. IL-18 also enhanced NKG2D expression on NK cells when administered with IL-2. In addition, blockade of NKG2D signaling with NKG2D-blocking antibody attenuated the up-regulatory effect of combining IL-18 and IL-2 on NK cytolysis. Our data revealed that IL-18 synergized with IL-2 to dramatically enhance the cytolytic activity of human NK cells in a NKG2D-dependent manner. The results appear encouraging for the use of combined IL-18 and IL-2 in tumor immunotherapy.

• Journal of Microbiology and Biotechnology
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• 제29권5호
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• pp.721-730
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• 2019

The probiotic Lactobacillus acidophilus KBL409 was encapsulated with alginate (Al) and alginate-chitosan (Al/Chi) through extrusion method. The sizes and zeta potentials of microspheres were measured to confirm encapsulation. To evaluate the protective effect of microspheres against gastrointestinal fluids, all the samples were exposed to simulated gastric fluids (SGFs, pH 1.5) at $37^{\circ}C$ for 1 or 2 h, followed by incubation with simulated intestinal fluids (SIFs, pH 6.5) for 2 h. The mucoadhesive ability of microspheres was evaluated using the intestinal epithelial cell line HT29-MTX. To extend the shelf-life of probiotics, lyoprotectants such as disaccharide and polysaccharide were mixed with free or encapsulated cells during the freeze-drying process. The size of the microspheres demonstrated a narrow distribution, while the zeta potentials of Al and Al/Chi-microspheres were $-17.9{\pm}2.3$ and $20.4{\pm}2.6mV$, respectively. Among all the samples, Al/Chi-encapsulated cells showed the highest survival rate even after exposure to SGF and SIF. The mucoadhesive abilities of Al and Al/Chi-microspheres were higher than 94%, whereas the free L. acidophilus showed 88.1% mucoadhesion. Ten percent of sucrose showed over 80% survival rate in free or encapsulated cells. Therefore, L. acidophilus encapsulated with Al and Al/Chi-microspheres showed higher survival rates after exposure to the gastrointestinal tract and better mucoadhesive abilities than the free cells. Also, sucrose showed the highest protective effect of L. acidophilus during the freeze-drying process.

• 한국식품영양과학회지
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• 제28권6호
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• pp.1321-1325
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• 1999

The inhibitory effect of Ramaria botrytis on the mutagenicity in Salmonella assay and cytotoxicity on cancer cell were studied. Ramaria botrytis methanol extracts showed antimutagenic effects of 60~90% on B(a)P and AFB1 in S. typhimurium TA98 and TA100. These extracts showed 73~85% antimutagenicity on TA100 against MNNG. The methanol extracts with strong antimutagenic activities were further fractionated by ethylacetate and water, the ethylacetate fraction were found to be stronger antimutagen icity against MNNG than water fraction. Ramaria botrytis methanol extracts and ethylacetate fraction revealed the highest cytoxicity against HT 29 human colon adenocarcinoma cells in which cell growth was inhibited by 57~88% and 69~94% at 0.25~1.0mg/ml, respectively. These methanol extract and ethyl acetate fraction exhibited 53~79% and 66~87% inhibition against HepG2 human hepatocarcinoma cells, respectively. But water fraction showed only 10~24% inhibition. However, these extract and fractions did not show cytotoxic effect against human chang liver cells. From these results, it is considered that Ramaria botrytis has stronger antimutagenic and anticancer effects in vitro.

• 약학회지
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• 제53권3호
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• pp.145-150
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• 2009

We evaluated cytotoxic effect based on the MTT assay and identified altered proteins in 5-FU(fluorouracil) treated HT29 cells using two-dimensional gel electrophoresis and MALDI-TOF/TOF-MS. As proteins inducing apoptosis, siah binding protein 1 and p47 protein isoform a were up-regulated and tumor protein translationally-controlled 1 was down-regulated by 5-FU treatment. And mannose 6 phosphate receptor binding protein 1 controls DNA mismatch repair system was increased. We suggest 5-FU promotes a cytotoxicity under the action of these proteins in colon cancer cells.

• 한국식품영양과학회지
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• 제27권2호
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• pp.350-358
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• 1998

The antimutagenic and anticancer activities of glycoprotein(GP) and chondroitin sulfate(CS) from sea cucumbers were studied using Ames mutagenicity test and human cancer cells culture test. The GP's inhibitory effect toward aflatoxin B1(AFB1) and 3, 2'-dimethyl-4-amino-biphenyl(DMAB) increased with the higher added concentrations up to 5% level(w/w) regardless fractionation methods. The GP from sea cucumbers through DEAE-cellulose column chromatography showed an inhibitory effect ranged from 84 to 98%, and the maximum antimutagenicities resulted in red sea cucumber with 98% (AFB1) and 95% (DMAB). But 5% level of CS from various sea cucumbers had an inhibitory effect toward those both indirect mutagens ranged from 79% to 85%. However, in case of direct mutagens(N-methyl-N'-nitro-N-nitrosoguanidine, MNNG and 4-nitroquinoline-1-oxide, 4-NQO), the GP's inhibitory effect was 55∼78% and the CS had a low inhibitory effect(58∼70%) at the added level of 5%. The GP from sea cucumbers exhibited the strong inhibitory effects with 89∼95% and 82∼92% on the growth of HT-29 human crcinoma cells and AZ-521 human gastric cancer cells (at 5% level).

• 생명과학회지
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• 제20권10호
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• pp.1532-1537
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• 2010

본 연구에서는 대두와 검정콩에 속하는 흑태, 서목태 및 서리태의 항돌연변이 및 암세포 증식 억제 활성을 비교하였다. Ames test를 이용한 항돌연변이 실험에서 간접돌연변이원인 $AFB_1$에 대해 모든 종류의 콩 메탄올 추출물들은 농도 의존적으로 돌연변이 억제 효과가 증가하였다(p<0.05). 대두 메탄올 추출물보다는 검정콩들인 흑태, 서목태 및 서리태 메탄올 추출물에 의한 효과가 높은 경향을 나타내었다. 검정콩 중에서 약콩이라고 불리는 서목태에 의한 항돌연변이 효과가 높아 첨가농도 5 mg/plate일 때 82%의 효과를 나타내었다. 직접 돌연변이원인 MNNG에 대한 각 종 콩 메탄올 추출물들의 항돌연변이성 실험을 한 결과, $AFB_1$에 대한 효과와 유사하게 검정콩중 서목태에 의한 효과가 높았으며 첨가농도 2.5 및 5 mg/plate일 때부터 각각 58% 및 61%로 돌연변이를 억제시켰다. 인체 암세포를 이용하여 대두 및 검정콩 메탄올 추출물들에 의한 암세포 증식 억제 효과를 검토한 결과, 모든 종류의 콩 메탄올 추출물(첨가농도 1 mg/ml)을 인체 위암세포(AGS)에 처리했을 때 50% 이상의 암세포 증식 억제 효과를 나타내었고 대두보다는 검정콩에 의한 효과가 높았으며 흑태, 서목태 및 서리태 메탄올 추출물은 각각 61%, 70% 및 65%의 암세포 증식 억제효과를 나타내었다. 인체 결장암세포(HT-29)의 경우, 검정콩 메탄올 추출물에 의한 효과가 대두보다 높은 경향을 나타내었으나 서목태 메탄올 추출물을 제외하고는 유의적 차이는 살펴 볼 수가 없었다. 인체 간암세포(Hep 3B)에 의한 증식 억제효과는 이상의 암세포에 대한 효과보다 다소 낮았으나 흑태, 서목태 및 서리태 메탄올 추출물은 첨가농도 1 mg/ml에서 각각 51%, 59% 및 52%의 저해효과를 나타내어 여기서도 서목태에 의한 억제효과가 높았다. 따라서 본 연구의 결과로부터 Ames test를 이용한 항돌연변이 및 인체 암세포 증식 억제 실험에서 검정콩 메탄올 추출물에 의한 억제 효과가 높았고 특히 소립 검정콩에 해당하는 서목태에 의한 생리활성이 우수하였으므로 검정콩에 많이 함유된 색소에 의한 효과라고 추정되며 여기에 대한 향후 연구가 필요하다.

• 한국환경보건학회지
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• 제34권1호
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• pp.55-61
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• 2008

This study was carried out to investigate the antioxidative and antitumor activities of Saussurea lappa for the purpose of developing a functional food. The methanol extract of Saussurea lappa was fractionated with five solvents (hexane, chloroform, EtOAc, BuOH, water) and examined for antioxidative activities and xanthine oxidase inhibitory activity in addition to growth inhibitory activity of human cancer cell (HT-29, SNU-1, HeLa). Total phenol compound contents were higher in EtOAC fraction than other fractions. Also, electron donating ability was over 90% at $500{\mu}g/ml$ (93.1 %) and $1000{\mu}g/ml$ (94.3%). The hexane fraction revealed stronger nitrite scavenging ability than the positive control (ascorbic acid) and its abilities were 22.4% and 42.8% at $500{\mu}g/ml$ and $1000{\mu}g/ml$, respectively. Xanthine oxidase inhibitory activity had similar tendency to electron donating ability. The EtOAc fraction showed high inhibition to xanthien oxidase activities at $500{\mu}g/ml$(81.9%) and $1000{\mu}g/ml$(90.4%). In the antitumor activity test, the hexane fraction exhibited potent growth inhibition activity against HT-29, SNU-1 and HeLa cells. Therefore, we believe that Saussurea lappa can be developed into a functional food with antioxidant activity. Additional studies are required for the hexane and chloroform fractions of Saussurea lappa to develop them into therapeutic supplements for stomach cancer, colon cancer, and cervical cancer.

• 대한의생명과학회지
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• 제18권4호
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• pp.362-368
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• 2012

Enterotoxigenic Bacteroides fragilis (ETBF) is an intestinal commensal bacterium implicated as a risk factor for colon cancer. The key virulence factor is a secreted toxin called B. fragilis toxin (BFT). In this study we used an in vitro bioassay to examine the prevalence of ETBF in colonic washings from patients with colorectal polyps and normal control patients. We found that 9.3% of polyp patients and 10.9% of non-polyp patients harbored ETBF, respectively. A total of nine ETBF clinical isolates were isolated and confirmed to be positive for the BFT gene by PCR analysis and the ability to induce IL-8 secretion in the colonic epithelial cell line HT29/c1. Two of the ETBF clinical strains were characterized further in vitro and in vivo. We found that the two ETBF clinical isolates induced E-cadherin cleavage in HT29/c1 cells and promoted colonic inflammation in C57BL/6 mice. Our results indicate that the prevalence of ETBF in polyp patients were similar in non-polyp patients suggesting that ETBF carriage does not positively correlate to polyp incidence.

• 한국식품영양과학회지
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• 제46권10호
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• pp.1253-1257
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• 2017

본 연구에서는 콩에서 유래한 단기 발효식품인 청국장, 물두시, 낫또 제품 중 대표적인 제품을 각각 하나씩 선택하여 이들의 일반적 특성과 항돌연변이 효능 및 항암 효능을 비교 연구하였다. 청국장은 아미노태 질소 및 암모니아태 질소의 함량이 높았으나, 낫또는 그 함량이 낮게 나타났다. 물두시의 경우 여타 발효식품에 비해 pH가 낮고 산도가 높았다. Ames test 및 HT-29 인체 대장암세포를 이용한 실험에서는 청국장이 우월한 항돌연변이 및 항암 효능을 나타냈다. 이상의 결과로 볼 때 청국장은 전반적으로 기능성이 우수한 것으로 나타났으며, 물두시는 낫또에 비해 기능성이 더 나은 것으로 나타났다. 이는 발효 기간의 차이, 제조방식, 원재료의 품질 등에 의한 것으로 여겨지며, 향후 각국의 식문화 및 조리 방식 등의 차이에 기초를 둔 추가적인 연구가 필요할 것으로 여겨진다.