Annals of Occupational and Environmental Medicine

Ki Woong Kim

7 Articles

A Meta-analysis on the Association between Bladder Cancer and Glutathione S transferase mu Genetic Polymorphism: Sang Baek Koh, Bong Suk Cha, Jong Ku Park, Chun Bae Kim, Myung Gun Kang, Ki Woong Kim, Won Jin Lee, Soung Hoon Chang; Korean Journal of Occupational and Environmental Medicine 1999;11(1):13-23. Published online March 31, 1999; DOI: https://doi.org/10.35371/kjoem.1999.11.1.13

Abstract PDF: This study was conducted to integrate the results of studies which assess the relationship between bladder cancer and Glutathione S transferase mu genetic polymorphism. We retrieved the literatures using MEDLINE search, with bladder cancer and Glutathione S transferase as key words, which were reported from 1980 to October 1998. The criteria for quality evaluation were as follows; 1) The paper should have histologically confirmed bladder cancer as case definition. 2) The paper should use the GSTM1 gene typing as method for analysis. Among 59 retrieved articles, fourteen studies were selected for quantitative meta-analysis. The overall effect size of the risk of bladder cancer due to GSTM1 was calculated by common odds ratio. Before the integration of each effect sizes into common effect sizes, the homogeneity test were conducted. All studies were case control design and cases were transitional cell carcinoma or squamous cell carcinoma of bladder. And only four papers used matching technique. Homogeneity of studies were rejected by Breslow-Day test(P<0.01), so random effect model was used for evaluation of odds ratio. The overall odds ratio of GSTM1 associated with bladder cancer was 1.55 (95% confidence interval 1.27 to 1.90) and cumulative odds ratio became more stable when the study subjects were over 1,500. Our result suggested that positive association be found between GSTM1 genetic polymorphism and bladder cancer.

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A Study on the N-methylformamide Excretion Rate of Workers at Synthetic Leather Factories in Korea: Ki Woong Kim, Byung Soon Choi, Seong Kyu Kang, Young Hahn Moon; Korean Journal of Occupational and Environmental Medicine 1999;11(1):106-112. Published online March 31, 1999; DOI: https://doi.org/10.35371/kjoem.1999.11.1.106

This study was conducted to examine the excretion rate of dimethylformamide (DMF) from the workers exposed to DMF. The study was done at two synthetic leather factories located in Kyeonggi-do from the period of May 2 to 30, 1996. N-methyl- formamide (NMF) concentrations in urine were measured and compared by the three exposure level of DMF in air. The mean concentration of the Low (dry and winder part). Moderate (rinsing part) and High (mixing and coating part) exposure group were 3.99+/-3.54. 10.19 +/-5.69 and 32.10+/-7.87 mg/m3 during workshift of 8 hours, respectively. The mean concentration of urinary N-methylforinamide (NMF) were 2.13+/-2.58, 11.16+/-4.98 and 26.24 +/-7.35 mg/g creatinine, respectively. The concentration of NMIF in urine could reach to maximum in 3 hours and was reduced nearly to zero in about 18 hours after exposure to DMF.

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Hepatotoxicity in Rats Treated with Dimethylformamide or Toluene or Both
Ki-Woong Kim, Yong Hyun Chung
Toxicological Research.2013; 29(3): 187. CrossRef
Assessment of correlation between markers of ambient monitoring and biological monitoring of dimethylformamide for workers in synthetic leather manufacturing factories in Korea
Yang In Hwang, Mi-Young Lee, Yun Kyung Chung, Eun A Kim
Analytical Science and Technology.2013; 26(5): 315. CrossRef
Clinical Outcomes of Occupational Exposure to N,N-Dimethylformamide: Perspectives from Experimental Toxicology
Tae Hyun Kim, Sang Geon Kim
Safety and Health at Work.2011; 2(2): 97. CrossRef

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Induction of Hepatic Microsomal Cytochrome P450 by Styrene in Rat: Ki Woong Kim, Sung Keun Chang, Hyo Seok Joung, Jun Yeon Lee, Young Hahn Moon, Sang Shin Park; Korean Journal of Occupational and Environmental Medicine 1997;9(4):604-613. Published online December 31, 1997; DOI: https://doi.org/10.35371/kjoem.1997.9.4.604

Abstract PDF

The effects of styrene on the induction of cytochrome P-450s (P450), (P4501A1/2, P4502B1/2 and P4502El) and activities of other related enzymes were investigated in the male Sprague Dawley rats which were treated with styrene 500 (S1), 1,000 (S2) 1,500 (S3) mg/kg in olive oil intraperitoneally once a day for two days and sacrificed for the preparation of liver microsomes after 24 hrs. 1. The contents of total protein and P450 in the microsomes derived from the styrene treated groups were slightly higher than those from the control group except those from the 53 group (1,500 mg styrene/kg body weight) . The decreases in microsomal protein contents was prominent in the S3 (p<0.05), but the P450 contents was increased significantly in the S2 (p<0.05). 2. The activities of NADPH-P450 and NADH b5 reductase in hepatic microsomes derived from the treated groups were significantly increased in the treated groups(p<0.05). 3. The activities of PROD were also prominently increased with the treatment of styrene except in 53 group, but the activity of EROD was decreased by styrene treatment. The activities of pNPH in the styrene treated groups were higher than that of the control group (p<0.05). 5. Western blotting with monoclonal antibodies against P4502B1/2 isozymes showed the presence of P4502B1/2 in hepatic microsomes from the rats treated with styrene, and the increase in the densities of immunoblots were corelated with the dosages of styrene. The blot densities against P4501A1/2 and P4502El were slightly increased in the styrene treated groups compared with the control group. These results suggested that styrene could primarily induce P4502B1/2 as major and P4501A1/2 and P4502El in minor forms for the metabolism of styrene in rats.

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Hepatotoxicity in Rats Treated with Dimethylformamide or Toluene or Both
Ki-Woong Kim, Yong Hyun Chung
Toxicological Research.2013; 29(3): 187. CrossRef

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Assessment of Cadmium in Blood and Urine of Occupationally Exposed Workers and Renal Dysfunction by Cumulative Exposure Estimate: Seong Kyu Kang, Jeong Sun Yang, Ki Woong Kim, Jae Yeon Jang, Ho Keum Chung; Korean Journal of Occupational and Environmental Medicine 1995;7(1):101-110. Published online February 28, 1995; DOI: https://doi.org/10.35371/kjoem.1995.7.1.101

Abstract PDF

88 workers exposed to cadmium were examined at the 12 factories using or producing cadmium in order to know the present state of cadmium exposure and renal dysfunction in 1992. Cadmium in blood and in urine were measured and compared by the 3 exposure level of cadmium in air. Cadmium in blood of low, moderate and high exposure group were 2.5, 3,8 and 7.6 microgram/L, respectively. Cadmium in urine were 1.8(1.3), 3.8(2,6) and 7.9 microgram/L(6.1 microgram/g creatinine) , resrectively. However, there was no relationship between Urinary cadmium and beta(2)-microglobulin. Cumulative exposure estimate (CEE) was calculated by multiplying the mean ambient cadmium level of the factory and working duration. CEE has a high correlation with cadmium in blood and urine, but no relation to beta(2)-microglobulin. Because working durations were relatively shorter than European workers', the highest CEE was just 300 microgram. year/m(3), which was not enough to induce renal tubular dysfunction. This study, however, suggested the possibility that renal tubular dysfunction caused by cadmium could be happened in Korea in the near future.

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Chronic Cadmium Intoxication and Renal Injury Among Workers of a Small-scale Silver Soldering Company
Won-Jun Choi, Seong-Kyu Kang, Seunghon Ham, Wookyung Chung, Ae Jin Kim, Myunghee Kang
Safety and Health at Work.2020; 11(2): 235. CrossRef

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Assessment of Occupational Exposure to Cadmium in Korea: Seong Kyu Kang, Jeong Pyo Hong, Ki Woong Kim, Jae Yeon Jang, Ho Keun Chung, Kyou Chull Chung; Korean Journal of Occupational and Environmental Medicine 1994;6(2):252-258. Published online September 30, 1994; DOI: https://doi.org/10.35371/kjoem.1994.6.2.252

Abstract PDF

Twenty-four factories registered at the Ministry of Labor as factories using or producing cadmium in 1991 were investigated to know the present state of occupational exposure to cadmium in 1992. Nine factories among 24 stopped using or changed to other substances and 1 factory didn't produce any more, but delivered it to other factories through imports. Therefore, only 14 factories were producing or using cadmium. But, alloying materials were uspplied to about 20 and more factories, however, they couldn't be investigated because of limited information. Three factories had less than 50 workers were 3, 6 had 50-300 and 5 had more than 300. About 167 workers were exposed to cadmium. According to the classification by process, there were 4 alloy processes, 2 refinary, 2 elctroplating, 2 dry cell making, 1 industrial battery and 1 copper refinary. 8 factories used metal cadmium, 3 cadmium oxide, 2 cadmium sulfide, and 1 cadmium hyroxide. One factory was importing cadmium stearates only and supplying them to the PVC making factories. The amount of metal cadmium producing in 2 refinary factories was about 50-65 ton per month. The other cadmium compounds were imported. According to exposure level of cadmium in air of the 10 factories examined, each factory could be divided into high, moderate and low exposure groups. 1 battery recycling factory and 3 alloy factories were in the high exposure group and their mean air concentrations were 0.06679, 0.05481, 0.02492, and 0.003mg/m3, respectively. Refinary and industrial battery making factories were in the middle exposure group and their mean air concentrations were 0.00773 and 0.00613 mg/m3, respectively. Finally, low exposure group were copper smelting, dry cell case making, duplicator drum making and electroplating factory and their mean air concentrations were 0.00096, 0.00071, 0.00057 and 0.00054 mg/m3 respectively.

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Chronic Cadmium Intoxication and Renal Injury Among Workers of a Small-scale Silver Soldering Company
Won-Jun Choi, Seong-Kyu Kang, Seunghon Ham, Wookyung Chung, Ae Jin Kim, Myunghee Kang
Safety and Health at Work.2020; 11(2): 235. CrossRef
The association between cadmium and lead exposure and blood pressure among workers of a smelting industry: a cross-sectional study
Hyun Chan An, Joo Hyun Sung, Jiho Lee, Chang Sun Sim, Sang Hoon Kim, Yangho Kim
Annals of Occupational and Environmental Medicine.2017;[Epub] CrossRef

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Studies on Activities of Xenobiotic Metabolic Enzymes in Rats treated with Trichloroethylene: Ki Woong Kim, Seong Kyu Kang, Byung Soon Choi, Jong Seong Lee, Jong Sung Kim, Young Hahn Moon; Korean Journal of Occupational and Environmental Medicine 1994;6(2):323-331. Published online September 30, 1994; DOI: https://doi.org/10.35371/kjoem.1994.6.2.323

Abstract PDF: Trichloroethylene (TRI) is one of the most widely used organic solvent in many industries. It is used a degreasing agent, extract and dillution solvents. TRI is metabolized by liver microsomal cytochrome P4SO to reactive intermediates, which are considered responsible for its hepatotoxicity. Cytochrome P450 is a key enzyme in the first step of TRI metabolism resulting in chloral hydrate (CH) formation, which is a rate-limiting step in TRI metabolism. This study was perfomed to find out the change of hepatic cytochrome P450 levels and of electron transport system for P-450 dependent reaction. Intraperitoneal injections of TRI were done to the male Sprague Dawley rats(mean body wights,170+/-10g) in corn oil at the dosage of 150,300,600 mg/kg for 2 days. The results of experiments are following : 1. The contents of microsomal protein, cytochrome P450 and b(5) are tended to be decreased with increasing amount of TRI, but not significantly (p>0.05) . 2. The activity of NADPH-cytochrome P450 reductase is slowly decreased by increasing amount of TRI, but not slgnificantly (p>0.05) . On the other hand, the activity of NADH-b(5) reductase is increased with increasing amount of TRI (p<0.05) 3. The activity of 7-ethoxyresolufin 0-deethylase did not show any critical changes (P>0.05) . This result suggests that the inductive pattern of TRI may not be related to P 450IAl and P450IIB.

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Styrene in Air and Blood and Mandelic acid in Urine in the Workers exposed to Styrene: Ho Keun Chung, Seong Kyu Kang, Jeong Sun Yang, Ki Woong Kim, Jong Seong Lee, Young Sook Cho, In Jeong Park; Korean Journal of Occupational and Environmental Medicine 1994;6(1):113-121. Published online February 28, 1994; DOI: https://doi.org/10.35371/kjoem.1994.6.1.113

Abstract PDF

The concentration of styrene in air and in blood and mandelic acid in urine were checked for the 60 workers with normal liver function, exposed to styrene. Styrene in air were sampled with personal air sampler at least 4 hours and analyzed by gas chromatography. Blood and spot urine were collected at the end of shift with a vacuum tube and a plyethylene bottle and analyzed by has chromatography and high performance liquid chromatography. Means of air and blood styrene and urine mandelic acid were 8.16 ppm (geometric mean), 0.199 mg/L, and 0.519 g/g creatinine, respectively. The concentration of styrene in air and mandelic acid in urine were high in the FRP factories and low in polymerization factory. Styrene in blood showed large difference by the working process. Styrene in air showed a good correlation with mandelic acid in urine(r=0.6369) and styrene in blood(r=0.6371). The mandelic acid in urine and styrene in blood corresponded to exposure of 50 ppm styrene were 0.890 g/g creatinine and 0.434 mg/L. However, hippuric acid in urine did not show any correlation with styrene in air. Urine mandelic acid excretion expected ratio showed a tendency to decrease according to obesity index and to increase with alcohol consumption.

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Evaluation of the Suitability of Establishing Biological Exposure Indices of Styrene
Ah-rum Choi, Sung-guk Im, Mi-young Lee, Se-Hoon Lee
Safety and Health at Work.2019; 10(1): 103. CrossRef

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