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심용희 국제사회복지학회 2015 국제사회복지학 Vol.5 No.1
이글은 해외와 국제기구, 그리고 국내의 정부기관에 진출해서 지구촌의 구성원으로서 꿈과 열정을 담 아 공부하시는 현재의 사회복지사들에게, 그리고 미래 국제무대의 리더들에게 그동안 선배들이 경험하고 걸어왔던 인턴쉽/ 직장경험, 그리고 외국의 생활체험을 나누고자 하는 데 그 목적이 있다. 국외 경험으 로는 뉴욕에 위치한 유니세프와(UNICEF), 국제인권기구(Human Rights Watch), 유엔경제사회국 (United Nations DESA)에서 경험을 자세히 나누며 국내 경험으로는 한국보건복지가족부 정책과에서 일 하고 배운고 느낀 바를 나누고자 한다.
심용희,이용욱,가와사키이찌로,임융호,오완석,백융기 한국분자세포생물학회 2008 Molecules and cells Vol.26 No.2
Flavone (2-phenyl chromone) is a well-known plant flavonoid, but its bioactivity has been little explored. Treatment of Caenorhabditis elegans or C. brissage with flavones induced embryonic and larval lethality that was pronounced in early larval stages. This anti-nematodal effect was also observed in the pinewood nematode, B. xylophilus. LD50 values were approximately 100 M for both B. xylophilus and C. elegans. Our results indicate that flavone is an active nematicidal compound that should be further investigated with the aim of developing a potent drug against B. xylophilus.
가와사키이찌로,심용희,정명환,윤유준,신윤경 한국분자세포생물학회 2013 Molecules and cells Vol.36 No.5
Caenorhabditis elegans, a cholesterol auxotroph, showed defects in larval development upon cholesterol starvation (CS) in a previous study. To identify cholesterol-respon-sive proteins likely responsible for the larval arrest upon CS, a comparative proteomic analysis was performed between C. elegans grown in normal medium supplemented with cholesterol (CN) and those grown in medium not supplemented with cholesterol (cholesterol starvation, CS). Our analysis revealed significant change (more than 2.2-fold, p < 0.05) in nine proteins upon CS. Six proteins were down-regulated [CE01270 (EEF-1A.1), CE08852 (SAMS-1), CE11068 (PMT-2), CE09015 (ACDH-1), CE12564 (R07H5.8), and CE09655 (RLA-0)], and three proteins were up-regu-lated [CE29645 (LEC-1), CE16576 (LEC-5), and CE01431 (NEX-1)]. RNAi phenotypes of two of the down-regulated genes, R07H5.8 (adenosine kinase) and rla-0 (ribosomal protein), in CN were similar to that of larval arrest in CS, and RNAi of a down-regulated gene, R07H5.8, in CS further enhanced the effects of CS, suggesting that down-regulation of these genes is likely responsible for the larval arrest in CS. All three up-regulated genes con-tain putative DAF-16 binding sites and mRNA levels of these three genes were all decreased in daf-16 mutants in CN, suggesting that DAF-16 activates expression of these genes.
민혜민,심용희,가와사키이찌로,강주미 한국분자세포생물학회 2015 Molecules and cells Vol.38 No.3
Intake of caffeine during pregnancy can cause retardation of fetal development. Although the significant influence of caffeine on animal development is widely recognized, much remains unknown about its mode of action because of its pleiotropic effects on living organisms. In the present study, by using Caenorhabditis elegans as a model organism, the effects of caffeine on development were examined. Brood size, embryonic lethality, and percent larval development were investigated, and caffeine was found to inhibit the development of C. elegans at most of the stages in a dosage-dependent fashion. Upon treatment with 30 mM caffeine, the majority (86.1 3.4%) of the L1 larvae were irreversibly arrested without further development. In contrast, many of the late-stage larvae survived and grew to adults when exposed to the same 30 mM caffeine. These results suggest that early-stage larvae are more susceptible to caffeine than later-stage larvae. To understand the metabolic responses to caffeine treatment, the levels of expression of cytochrome P450 (cyp) genes were examined with or without caffeine treatment using comparative microarray, and it was found that the expression of 24 cyp genes was increased by more than 2-fold (p < 0.05). Among them, induction of the cyp-35A gene family was the most prominent. Interestingly, depletion of the cyp-35A family genes one-by-one or in combination through RNA interference resulted in partial rescue from early larval developmental arrest caused by caffeine treatment, suggesting that the high-level induction of cyp-35A family genes can be fatal to the development of early-stage larvae.
간암조직에서 DNA methyltransferase의 발현
이귀연,박혜정,심용희 建國大學校基礎科學硏究所 2002 理學論集 Vol.27 No.-
암억제유전자의 과메틸화는 유전자의 발현을 억제하는 작용으로 암발생 기전에 중요한 요인으로 알려져 왔다. DNA 과메틸화는 DNA methyltransferase (Dnmt)에 의해서 생성되는데 현재까지 그 기능이 알려진 것으로 Dnmt1, Dnmt3a, Dnmt3b가 있다. 본 논문에서는 한국인의 간암조직 27개과 각 예에 상응되는 정상조직 27 개에서 위의 세 효소의 발현정도를 역전사효소-중합연쇄반응으로 조사하였다. Dnmt1는 정상조직에서 40.7% (11/27), 간암조직에서 33.3% (9/27); Dnmt3a는 정상조직에서 22.2% (6/27), 간암조직에서 63% (17/27); Dnmt3b는 정상조직에서는 전혀 발현 되지 않았으며 간암조직에서 51.9% (14/27)가 발현되었다. Dnmt1은 유전자의 메틸화정도를 유지시키는 기능을 하는 반면에 Dnmt3a와 Dnmt3b는 de novo 메틸화를 담당한다. Dnmt3a와 Dnmt3b의 발현이 Dnmt1보다 1.6-1.9 배 간암조직에서 높았으며 정상조직에서는 Dnmt1 (40.7%)의 발현이 22.2%인 Dnmt3a와 전혀 발현을 보이지 않은 Dnmt3b보다 훨씬 높았다. 위의 실험결과는 정상조직에서는 유전자의 메틸화를 유지하기 위하여 DNA 메틸화가 되는 반면에 종양조직에서는 새로운 유전자의 메틸화가 유발됨을 시사한다. 이는 새로운 유전자의 과메틸화의 증가가 암 발생기전의 요인이 될 가능성을 제시하는 결과이다. Hypermethylation on CpG islands of a tumor suppressor gene has been frequently detected in a variety of cancer cells and known to repress the level of transcription. To identify the molecular mechanism for hypermethylation of tumor suppressor genes in hepatocellular carcinomas (HCC), we examined DNA methyltransferase (Dnmt) expression level in HCC. Three Dnmts, Dnmt1, Dnmt3a and Dnmt3b that have been identified as being enzymatically active were examined by RT-PCR. Expression of Dnmts was detected in both non-neoplastic control liver and in HCC. Eleven out of 27 (40.7%) controls and 9 out of 27 (33.3%) HCC; 6 out of 27 (22.2%) controls and 17 out of 27 (63%) HCC; none of 27 controls and 14 out of 27 (51.9%) HCC revealed expression of Dnmt1, Dnmt3a, and Dnmt3b, respectively. The relatively high frequency of Dnmt1 expression in non-neoplastic control suggests that expression of Dnmt1 is required for maintenance of methylation profile in non-neoplastic cells. In addition, higher frequencies of Dnmt3a and Dnmt3b expression in HCC suggest that de novo DNA methylation in tumor cells may be the major process for gene inactivation during hepatocarcinogenesis.