환경 오염물질의 진보된 독성 평가 기법

류재천,최윤정,김연정,김형태,방형애,송윤선 한국환경독성학회 1999 환경독성보건학회지 Vol.14 No.1

Recently, several new methods for the detection of genetic damages in vitro and in vivo based on molecular biological techniques were introduced according to the rapid progress in toxicology combined with cellular and molecular biology. Among these methods, mouse lymphoma thymidine kanase (tk) gene forward mutation assay, single cell gel electrophoresis (comet assay) and transgenic animal and cell line model as a target gene of lac I (Big Blue) and lac Z (Muta Mouse) gene mutation are newly introduced based on molecular toxicological approaches. The mouse lymphoma tk^(+/-) gene assay (MOLY) using L5178Y tk+i- mouse lymphoma cell line is one of the mammalian forward mutation assays, and has many advantages and more sensitive than hprt assay. The target gene of MOLY is a heterozygous tk^(+/-) gene located in 11 chromosome, so it is able to detect the wide range of genetic changes like point mutation, deletion, rearrangement, and mitotic recombination within tk gene or deletion of entire chromosome 11. The comet assay is a rapid, simple, visual and sensitive technique for measuring and analysing DNA breakages in mammalian cells. Also, transgenic animal and cell line models, which have exogenous DNA incorporated into their genome, carry recoverable shuttle vector containing reporter genes to assess endogenous effects or alteration in specific genes related to disease process, are powerful tools to study the mechanism of mutation in vivo and in vitro, respectively. Also in vivo acridine orange supravital staining micronucleus assay by using mouse peripheral reticulocytes was introduced as an alternative of bone marrow micronucleus assay. In this respect, there was an International workshop on genotoxicity procedure (IWGTP) supported by OECD and EMS (Environmental Mutagen Society) at Washington D, C, in March 25-26, 1999. The objective of IWGTP is to harmonize the testing procedures internationally, and to extend to finalization of OECD guideline, and to the agreement of new guidelines under the International Conference of Harmonization (ICH) for these methods mentioned above. Therefore, we introduce and review the principle, detailed procedure, and application of MOLY, comet assay, transgenic mutagenesis assay and supravital staining micronucleus assay.

항암화학요법 중 호중구감소증이 발생한 저위험군 발열 환자들을 대상으로 한 경구 항균제 요법의 임상적 유용성 및 안정성에 대한 연구

김연숙,이혁,기현균,김춘관,김신우,김성민,백경란,김원석,윤성수,이홍기,강원기,박찬형,박근칠,송재훈 대한화학요법학회 2000 대한화학요법학회지 Vol.18 No.1

목적 : 항암화학요법 중 호중구감소증을 동반한 발열이 발생하는 암환자들을 치료하기 위한 다양한 항균제와 여러 가지 방법들이 시도되고 있는 가운데, 합병증과 사망률의 발생가능성이 적은 저위험군 환자들을 대상으로 초기 72시간동안 정주 항균제를 투여한 이후 경구 항균제로 전환하는 요법의 유용성과 안정성을 평가해보고자 본 연구를 시행하였다. 방법 : 1998년 2월부터 1999년 9월까지 본원에서 항암화학요법 중 호중구감소증과 발열이 발생한 환자들 가운데 기저 암질환이 고형암이거나 림프종이고, 입원당시 패혈증의 증후가 없으며 입원 72시간이내에 해열되고 백혈구수치가 증가 추세인 환자들을 대상으로 하여 72시간 동안 정주 항균제를 투여한 이후 경우 ciprofloxacin 750㎎을 하루 2회씩 투여하여 총 4일간 투여하였다. 모든 환자들은 열이 떨어지고 호중구감소증이 회복될 때까지 입원하도록 하였다. 결과 : 총 38명 환자의 40예가 등록이 되었고, 환자들의 기저암 질환은 고형함이 72.5%, 림프종이 27.5%였다. 입원당시 평균 호중구치수는 156/㎕였고, 호중구수치가 100/㎕미만인 경우는 65%였으며, 호중구감소증이 지속된 기간의 평균은 2.4일이었다. 40예 중 39예가 항균제의 변형이나 추가 없이 호중구감소증과 발열로부터 회복이 되어 97.5%의 성공율(95% 신뢰구간: 86.8-99.9%)을 보였다. 부작용으로 피부발진이 있었던 경우가 한 예 있었는데, 증상이 경하여 경구 항균제를 지속할 수 있었다. 심와부의 동통으로 복용을 지속할 수 없어서 대상에서 제외된 예가 또 한 예 있었다. 결론 : 항암요법 중 호중구감소증과 발열을 동반한 환자들 가운데 저위험군 환자들에서 항균제 72시간정주 이후 경구 항균제로의 전환요법은 효과적이고도 안전한 치료방법이라고 할 수 있다. Background : Oral antibiotic therapy following empirical intravenous antibiotics may be effective and safe for febrile neutropenic patients with lowrisk for complications. Methods : We conducted a prospective clinical trial of oral antibiotic therapy in the patients with neutropenia and fever during chemotherapy for cancer. Underlying malignancies were solid tumor or lymphoma with short duration of neurtropenia and the patients had no evidence of clinically or microbiologically documented infections. Oral ciprofloxacin was given to the patients who lacked signs of sepsis on admission, had a rising tendency of neutrophil count (ANC >100 /㎕ ) at 72 hours, and were afebrile at 72 hours. All patients were hospitalized until neutropenia and fever resolved. Results : A total of 40 episodes of 38 patients were enrolled from February 1998 to September 1999. The mean neutrophil counts on admission were 156/㎕ and the mean duration of neutropenia was 2.4 days. The episodes which had neutrophil count below 100 /㎕ were 26 (65%). Treatment was successful in 39 of 40 episodes (97.5% : 95 % confidence interval, 86.8% to 99.9%). Adverse reactions of oral ciprofloxacin were skin rash and epigastric soreness in two cases, respectively. There were no deaths during the study. Conclusions : For low-risk febrile patients with neutropenia during cancer chemotherapy, switch therapy to oral ciprofloxacin at 72 hours following intravenous broad-spectrum antibiotics is effective and safe,

Knowledge Gaps in PCAS Care

( Chun Song Youn ) 대한응급의학회 2016 대한응급의학회 학술대회초록집 Vol.2016 No.1

다량의 태아-모체간 수혈로 인한 중증 신생아 빈혈 2예

송은송 ( Eun Song Song ),김기환 ( Ki Hwan Kim ),김소연 ( So Youn Kim ),박천학 ( Chun Hak Park ),최영륜 ( Young Youn Choi ) 대한주산의학회 2004 Perinatology Vol.15 No.2

Feto-maternal hemorrhage, the presence of fetal red blood cells in the maternal circulation, occurs in up to 75% of pregnancies. But its volume is usually very small. Feto-maternal hemorrhage of more than 30 ml of whole blood is relatively rare. The key features that lead to early diagnosis are the maternal history, fetal monitoring, the clinical and laboratory findings of anemia and a negative Coombs` test. Diagnosis is confirmed by Kleihauer-Betke test. Perinatal problems include fetal distress, neonatal anemia, hypovolemic shock, and death. The fetal outcome depends on the amount and rate of bleeding. The initial hemoglobin level was a better predictor than the volume of bleeding. We present two cases of severe neonatal anemia associated with massive feto-maternal hemorrhage, which was confirmed by Kleihauer-Betke test.

Virucidal efficacy of a paraformaldehyde-containing fumigant against Avian influenza virus

( Chun Nam Cha ),( Eun Kee Park ),( Chang Yeul Yoo ),( Ji Youn Jung ),( Song Ee Son ),( Suk Kim ),( Hu Jang Lee ) 한국예방수의학회 2016 예방수의학회지 Vol.40 No.2

In this study, the virucidal efficacy of a fumigant (35% paraformaldehyde) against avian influenza virus (AIV) was examined. After AIV suspensions had been deposited on stainless steel carriers, the dried carriers were exposed to the fumigant in a 300-m3 test room for 3 h. Thereafter, all carriers were submerged in a neutralizing solution to scrape off the surviving viruses, and the respective suspensions were diluted. Each dilution factor was respectively inoculated into the allantoic membrane of five 10-day-old embryos. After incubation, AIV viability in the collected allantoic fluids was examined and the EID50 was calculated. The fumigant inactivated ≥5.7log10EID50 of AIV and was nontoxic to the embryos.

TRIMMING LINE DESIGN USING AN INCREMENTAL DEVELOPMENT MOTHOD AND A FINITE ELEMENT INVERSE METHOD

YOUN-JOON SONG,CHUN-DAL PARK,YOUNG-HO HAHN,WAN-JIN CHUNG 한국소성가공학회 2008 한국소성가공학회 컨퍼런스 Vol.2008 No.10

The Paracrine Effects of Mesenchymal Stem Cells Stimulate the Regeneration Capacity of Endogenous Stem Cells in the Repair of a Bladder-Outlet-Obstruction-Induced Overactive Bladder

Song, Miho,Heo, Jinbeom,Chun, Ji-Youn,Bae, Hee Sook,Kang, Jeong Wook,Kang, Hyunsook,Cho, Yong Mee,Kim, Seong Who,Shin, Dong-Myung,Choo, Myung-Soo Mary Ann Liebert 2014 STEM CELLS AND DEVELOPMENT Vol.23 No.6

Bactericidal Efficacy of a Fumigation Disinfectant Containing Paraformaldehyde Against Salmonella Typhimurium

Chun-Nam Cha,Song-Ee Son,Ji-Youn Jung,Chang-Yeul Yoo,Eun-Kee Park,Suk Kim,Hu-Jang Lee 한국식품위생안전성학회 2016 한국식품위생안전성학회지 Vol.31 No.3

본 연구는 S. Typhimurium을 대상으로 paraformaldehyde 35%를 함유한 훈증소독제의 살균효과를 평가하기 위해 수행되었다. 예비 시험에서, S. Typhimurium의 현탁액 균수는 모두 3.9 × 108CFU/mL이었으며, 훈증소독제에 노출시킨 모든 담체의 균수는 평판배지법과 여과법으로 배양한 시험균주 현탁액의 균수의 50%보다 많았다. 또한, 대조담체로부터 회복된 S. Typhimurium 균수는 모두 3.3 × 106 CFU/mL이었다. 훈증소독제의 살균효과 시험에서는, 훈증소독제를 처리한 담체의 S. Typhimurium의 감소 균수는 5.22 log CFU/mL로 나타났다. 이상의 결과로부터, paraformaldehyde를 주성분으로 하는 훈증소독제는 S. Typhimurium에 대해 효과적인 살균력을 갖는 것으로 확인되었으며, 병원성 세균에 오염된 식품재료 및 주방용품의 소독에 적용할 수 있을 것으로 사료된다. This study was performed to evaluate the bactericidal efficacy of a fumigation disinfectant containing 35% paraformaldehyde against Salmonella Typhimurium (S. Typhimurium). In this study, the efficacy test of a fumigant against S. Typhimurium was carried out according to French standard NF T 72-281. The S. Typhimurium working culture suspension number (N value), all bacteria numbers on the carriers exposed to the fumigant (n1, n2, and n3), the number of bacterial suspensions by the pour plate method (N1), the number of bacterial suspensions by the filter membrane method (N2), and the mean number of bacteria recovered on the control carriers (T value), were obtained from the preliminary test. In addition, the reduction number of S. Typhimurium exposed to the fumigant (d value) was calculated using the T value, the mean number of bacteria in the recovery solution (n'1) and the mean number of bacteria on carriers plated in agar (n'2). The N value was 5.5 × 108 colony forming units (CFU)/mL, and n1, n2, and n3 were higher than 0.5N1, 0.5N2 and 0.5N1, respectively. Additionally, the T value was 3.5 × 106 CFU/carrier. In terms of the bactericidal effect of the fumigant, the d value was 5.25. According to the French standard for fumigants, the d value for an effective bactericidal fumigant should be greater than 5. The results indicated that the fumigant containing 35% paraformaldehyde had an efficient bactericidal activity against S. Typhimurium, and, therefore, can be used to disinfect food materials and kitchen appliances contaminated with foodborne bacteria.

Effects of Naloxone on Cerebral Blood Flow in the Induced Subarachn oid Hemorrhage in Cat

Song, Jin Un,Park, Chun Kun,Kang, Joon Ki,Youn, Suck Hoon,Cho, Byoung Il,Kim, Dal Soo,Kim, Moon Chan,Baik, Min Woo CATHOLIC MEDICAL CENTER 1986 Bulletin of the Clinical Research Institute Vol.14 No.1

This research was planned to observe the acute change of regional cerebral blood flow (rCBF) in experimentally induced subarachnoid hemorrhage in cat, to investigate whether endogenous opiate plays a role in the mechanism of the acute reduction in cerebral blood flow following subarachoid hemorrhage, and to document the therapeutic value of naloxone in the treatment of subarachnoid hemorrhage. Induction of subarachnoid hemorrhage result in a significant reduction of cerebral blood flow (CBF) (P<0.005). Administration of naloxone (10㎎/㎏) made the reduced cerebral blood flow following subarachnoid hemorrhage increase to normal level (P<0.05). At that time naloxone did not have any significant effect on intracranial pressure and blood pressure in comparison with the naloxone treated control group. These data suggest that endogenous opiate can play an important role in the mechanism of the acute reduction in cerebral blood flow following subarachnoid hemorrhage and naloxone, opiate antagonist, may induce increase in cerebral blood flow by reversing the effects of endogenous opiate and its direct cerebral vasodilator properties.

Mesenchymal Stem Cell Therapy Alleviates Interstitial Cystitis by Activating Wnt Signaling Pathway

Song, Miho,Lim, Jisun,Yu, Hwan Yeul,Park, Junsoo,Chun, Ji-Youn,Jeong, Jaeho,Heo, Jinbeom,Kang, Hyunsook,Kim, YongHwan,Cho, Yong Mee,Kim, Seong Who,Oh, Wonil,Choi, Soo Jin,Jang, Sung-Wuk,Park, Sanghyeo Mary Ann Liebert 2015 STEM CELLS AND DEVELOPMENT Vol.24 No.14