• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제34권6호
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• pp.602-610
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• 2008

Purpose Acrylamide is present in significant quantities in a wide range of commonly consumed human foods. Carcinogenic risk of acrylamide through the consumption of food is a great public concern and in controversy, but it is not properly addressed due to the lack of evidence in humans. While a plenty of data is available on the carcinogenicity in animal models, the studies in humans are limited. Thus, the present study attempted to examine the carcinogenic potentials of acrylamide on the human epithelial cell, which is the target cell origin of the most cancers. Material and method & Result 1. Acrylamide was not cytotoxic up to $100{\mu}M$ as measured by MTT and LDH assays, indicating a relatively low toxicity of this substance in human epithelial cells. 2. The parameters of neoplastic cellular transformation such as cell saturation density, soft-agar colony formation and cell aggregation were analyzed to examine the carcinogenic potential of acrylamide. 3. The neoplastic transformation was further increased with the co-treatment of TPA 4. Antioxidants blocked the generation of Reactive Oxygen Species(ROS) and the GSH depleting agent dramatically increased the ROS production. 5. mRNA levels of fibronectin following acrylamide exposure was increased in a dose-dependent manner, indicating a possible biomarker of acrylamide-induced cellular transformation. Conclusion The present study will provide a valuable basis to compare the interspecies differences in response to carcinogenic potentials of acrylamide. The data on the interspecies differences are essential element in human risk assessment. Thus, our results obtained from the human epithelial cells will contribute to improving the risk assessment of human neoplasm including oral cancer.

• 대한골관절종양학회지
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• 제7권4호
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• pp.144-150
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• 2001

양성 거대세포종의 방사선 치료후 발생한 골육종은 드물지 않으나, 거대세포종의 수술적 처치후 자연적으로 악성 전환한 골육종은 매우 드문 질환으로 높은 사망률을 가지는 악성종양이다. 대퇴골 원위부에 발생한 양성 거대세포종을 소파술과 골이식술 또는 시멘트 충진술과 같은 수술적 치료후 추시기간 2년 1개월, 9년 8개월에 동일 부위에서 악성전환으로 인해 발생한 골육종 2례에 대하여 화학요법 및 광범위 절제술과 재건술로 치료하여 추시결과를 보고하는 바이다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.652-653
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• 2014

본 논문에서는 카르노 맵상에서 생성된 Cell [fi]을 이용하여 GRM 상수를 생성하는 방법에 대해 논의하였다. Cell을 이용한 방법은 GRM 상수를 구하는 일반적인 방법과는 다르게 카르노 맵상에서 임의의 Cell들을 선택하여 그 Cell들을 단일변수 변환행렬과 연산해서 다시 카르노 맵으로 mapping하는 방법이다. 또한 이 방법을 극수의 순환성에 적용하여 새로운 GRM 상수 생성 방법에 대해 논의하였다.

• 한국환경성돌연변이발암원학회지
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• 제26권4호
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• pp.125-132
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• 2006

Previous studies showed that epigallocatechin gallate(EGCG) have substantial effects of suppressing the N-methyl-N'-nitro-N-nitrosoguanidine(MNNG)-initiated cell transformation process on the bases of foci formation frequency and loss of anchorage dependency. In this study we tried to clarify the molecular mechanism of suppressing the cell transformation process. Mouse cell line balb/c 3T3 A31-1-1 was exposed 2 days to MNNG followed by 15 days 12-O-tetradecanoylphorbol-13-acetate(TPA) treatment for our transformation process. EGCG was added after the time point of 24 hours exposure to TPA and incubated for 19 days. 2029 genes were selected in our transformation process that showed fold change value of 1.5 or more in the microarray gene expression analysis covering the mouse full genome. These genes were found to be involved mainly in the cell cycle pathway, focal adhesion, adherens junction, TGE-$\beta$ signaling, apoptosis, lysine degradation, insulin signaling, ECM-receptor interaction. Among the genes, we focused on the 631 genes(FC>0.5) reciprocally affected by EGCG treatment. Our study suggest that EGCG down-regulate the gene expressions of up stream signaling factors such as nemo like kinase with MAPK activity and PI3-Kinase, Ras GTPase and down stream factors such as cyclin D1, D2, H, T2, cdk6.

• 대한바이러스학회지
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• 제26권2호
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• pp.269-272
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• 1996

Adenovirus group consists of over 100 related viruses which have been isolated from respiratory or gastro-intestinal tract of primate, cattle, dog and mice. Approximately 40 serologic types of adenovirus producing a variety of human respiratory and conjunctival infections were identified. Adenoviruses are icosahedral virions containing double-stranded linea DNA. They are 70nm to 90nm in diameter and each of capsid is composed of 252 capsomeres. Several numbers of this group, including types commonly associated with respiratory disease in man, are capable of producing malignant tumors in young hamsters and a few types have been shown to be on-cogenic in young rat. Previous report involving effect of Hormone on replication of adenovirus(9) has been carried out. The present report represents a continuation of previous study. To obtain evidence concerning the effect of caffeine on the transformation, investigation of adenovirus type 12 of this group was undertaken. For practical consideration it was desirable to investigation of the effect of caffeine on the adenovirus type 12-induced transformation in L cell. Results were as follows; 1. Adenovirus type 12-induced transformation was inhibited in the presence of caffeine. 2. Yields of adeoovirus type 12 in L cell were slightly inhibited by treatment of caffeine.

• 한국미생물·생명공학회지
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• 제13권4호
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• pp.345-348
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• 1985

Mannitol hypertonic regeneration media를 사용하는 PEG-induced protoplast transformation system을 이용해서 pUB110과 pE194의 recombinant plasmid로 B. subtilis BR151을 transformation 시킴으로써 두 plasmid에서 유래되는 각각의 Neo$^{R}$와 Em$^{R}$을 동일한 recipient cell 내에서 동시에 발현시킬 수 있었다. Neomycin과 erythromycin을 함께 함유하는 mannitol regeneration media상에서 recombinant plasmid의 transformation frequency는 6.5 $\times$ $10^{-5}$이었다. 한편 transformant cell 내에서 recombinant plasmid의 replication이 agarose gel electrophoresis로 확인되었다.

• 한국식품저장유통학회지
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• 제7권4호
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• pp.414-417
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• 2000

단백질분해효소를 생산하지 않는 균주 B. subtilis MT-2의 염색체 DNA를 추출한 다음, B. subtilis AC819 균주에 상동성 유전자재조합을 이용하여 competent cell 형질전환을 시켰다. 얻어진 형질전환체를 B. subtilis HL-1이라고 명명하였으며, 그 표현형은 histidine 요구성, streptomycin 내성, tetracyclin 내성을 나타내면서 단백질 분해효소를 생산하지 않았다. 플라스미드 pUB110 을 이용한 B. subtilis HL-1의 protoplst 형질전환율은 B. subtilis MT-2의 형질전환율보다 높았다. 따라서 새로운 B. subtilis HL-1균주는 단백질분해효소의 형질전환과 내열성 protease 유전자클로닝에서 숙주로 사용하는데 유용하다.

• Journal of Microbiology and Biotechnology
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• 제22권1호
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• pp.25-33
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• 2012

The association of verotoxic E. coli and Acinetobacter spp. with various antibiotic-resistant, diarrhogenic, and nosocomial infections has been a cause for concern worldwide. E. coli and A. haemolyticus isolated on a number of selective media were screened for virulence factors, antibiotic resistance, and transformation of resistance genes. Out of 69 E. coli isolates obtained, 25 (35.23%), 14 (20.30%), and 28 (40.58%) were positive for Vtx1&2, Vtx1, and Vtx2, respectively, 49 (71.015%) for extendedspectrum beta-lactamases (ESBLs), 34 (49.28%) for serum resistance, 57 (82.61%) for cell surface hydrophobicity, 48 (69.57%) for gelatinase production, and 37 (53.62%) for hemolysin production. For the 14 A. haemolyticus isolates, only 2 (14.29%) in each case from all the samples investigated were positive for Vtx1, Vtx2 and Vtx1&2 respectively, 8 (57.14%) for ESBLs, 7 (50.00%) for serum resistance, 11 (78.57%) for cell surface hydrophobicity, 4 (28.57%) for gelatinase production, and 8 (57.14%) for hemolysin production. Although transformation occurred among the E. coli and Acinetobacter isolates (transformation frequency: $13.3{\times}10^{-7}-53.4^{-7}$), there was poor curing of the plasmid genes, a confirmation of the presence of stable antibiotic-resistant genes (DNA concentration between 42.7 and 123.8 ${\mu}g$) and intragenetic transfer of multidrug-resistant genes among the isolates. The isolates were potentially virulent and contained potentially transferable antibiotic resistance genes. Detection of virulence factors, antibiotic resistance genes, and transformation among these isolates is a very significant outcome that will influence approaches to proactive preventive and control measures and future investigations. However, continued surveillance for drug resistance among these bacteria and further investigation of the mechanism of action of their virulence factors are a necessity.

• International journal of thyroidology
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• 제10권2호
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• pp.127-132
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• 2017

Anaplastic transformation of differentiated thyroid cancer at distant metastatic sites is extremely rare and has a poor prognosis. It usually occurs in the thyroid gland or cervical lymph nodes. Here we report a case of anaplastic transformation arising at multiple distant metastatic sites including the lung, liver, adrenal gland, bone, and lymph nodes in a patient 3 years after total thyroidectomy for follicular thyroid cancer.

• 대한골관절종양학회지
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• 제18권1호
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• pp.14-19
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• 2012

목적: 저자들은 골육종으로 악성 변화한 거대 세포종 환자의 종양학적 결과에 대해 알아보고자 하였다. 대상 및 방법: 2000년 1월부터 2012년 2월까지 외부에서 양성 거대 세포종으로 진단받은 뒤 치료받고 재발한 후 악성 변화가 의심되어 본원으로 전원된 5명의 환자를 대상으로 하였다. 5명 환자 모두 방사선 치료를 시행받은 병력은 없었다. 결과: 모든 환자는 광범위 절제술 시행받았고, 술 후 조직병리 검사상 골육종으로 확진되었다. 원발성 병변은 원위 대퇴골 3명, 근위 대퇴골 1명, 원위 요골 1명이었다. 양성 거대 세포종으로 진단받고 악성 변화하기까지 기간은 평균 49.2개월(24-126개월)이었다. 평균 추시 기간은 21.6개월이었다. 본원에서 광범위 절제술을 시행 받았음에도 3명에서 원격 전이가 발생하였고, 이들 중 2명의 환자에서는 국소 재발도 확인되었다. 이들 3명 모두 사망하였다. 결론: 본 증례로 보아 적절한 치료를 받은 양성 거대 세포종 환자에서도 악성 변화는 5년 이내에 발생할 수 있다. 따라서, 정기적 추시 중 방사선학적으로 육종 변화가 의심되는 경우 보다 적극적인 치료가 필요하다고 생각된다.