• 한국치위생학회지
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• 제14권3호
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• pp.425-430
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• 2014

Objectives : The purpose of this study is to investigate the correlation between amalgam restorations and urinary mercury levels in children for 1 year. Amalgam restoration has been widely used for over 200 years. But released mercury from amalgam can increase the concentration of mercury in the body. Methods : The subjects were 463 elementary school children. Oral examination, urine sampling, and questionnaire survey were performed at baseline and after 1 year. Results : Amalgam restoration increased the urinary mercury level to $0.55{\pm}0.13{\mu}g/g$ creatinine. In the regression analysis, variation of urinary mercury excretion were positively associated with amalgam surfaces and fish consumption. Conclusions : Small amount of mercury release from amalgam restoration was closely associated with increasing urinary mercury level.

• Molecular & Cellular Toxicology
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• 제4권4호
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• pp.360-365
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• 2008

In the last several years, studies on the association of oxidative stress damage with exposure in the work place have been conducted. Xenobiotics create an imbalance of the homeostasis between oxidant molecules and antioxidant defense. By monitoring oxidative stress biomarkers, information was obtained on damages induced by oxidative stress and the toxicity of xenobiotics. In the present study, a Job Exposure Matrix (JEM) was constructed using the data from the Working Environment Measurement (WEM) of painters in the shipyard industry from the past 3 years to assess the exposure status. Additionally, by measuring the concentration of urinary malondialdehyde (MDA), the effect of lipid peroxidation was examined. The subjects consisted of 68 workers who were exposed to mixed organic solvents in the painting process and 25 non-exposure controls. The exposure indices of the exposure groups were significantly different (sprayer: 0.83, touchup: 0.54, assistant: 0.13, P<0.05). The urinary MDA concentration of the exposure group was 48.60${\pm}$ 39.23 ${\mu}mol$/mol creatinine, which was significantly higher than 18.03${\pm}$16.33 ${\mu}mol$/mol creatinine of the control group (P<0.05). From the multiple regression analysis of urinary MDA, the regression coefficient for exposure grade was statistically significant. In future studies, evaluation of the antioxidant levels of subjects should be performed simultaneously with quantitative exposure measurements.

• Journal of Chest Surgery
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• 제14권4호
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• pp.319-323
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• 1981

To clarify the clinical spectrum of non-oliguric acute renal failure, we undertook a retrospective study of 16 cases of acute renal failure following trauma and surgery, 6 of whom were non-oliguric throughout their periods of azotemia. With the clinical symptoms, BUN, creatinine and some urinary diagnostic indexes, we analyzed the differences between non-oliguric and oliguric renal failure. And the results were: 1. The nonoliguric form [10 cases] was more common than oliguric [6 cases], especially post-traumatic failure. 2. The both types belonged to parenchymal renal failure by the U/P UN ratio and urinary Na concentration [Vertal, 1967]. 3. The non-oliguric form was lesser severe in urinary diagnostic indexes and clinically. The non-oliguric renal failure has better clinical course and prognosis, the failure to diagnose it is as dangerous as the failure oliguric renal failure.

• Journal of Preventive Medicine and Public Health
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• 제37권4호
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• pp.321-328
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• 2004

Objectives : The purpose of this study was to investigate the effect of genetic polymorphism of cytochrome P450 2E1 (CYP2E1) and aldehyde dehydrogenase 2 (ALDH2) on the xylene metabolism. Methods : Among 247 workers, 116 were occupationally exposed to xylene and 131 were not. Workers exposed to xylene had different work such as spray, touch-up, mix & assist, and pre-treat. Questionnaire variables were age, sex, use of personal protective equipment, smoking, previous night's drinking and work duration. The urinary methylhippuric acid was measured in the urine collected in the afternoon and corrected by urinary creatinine concentration. The genotypes of CYP2E1 and ALDH2 were investigated by using PCR-RFLP (polymerase chain reaction-restriction fragment length polymorphism) methods with DNA extracted from venous blood. Results : 1. The urinary concentrations of o-, m-, and p-methylhippuric acid and total methylhippuric acid in the exposed group were significantly higher than those in the non-exposed group (p<0.001). 2. In multiple regression analysis, the urinary methylhippuric acid concentration was significantly influenced by exposure grade (Job-exposure matrixes), smoking, drug use and kind of protective equipment (p<0.1). 3. Genetic polymorphism of CYP2E1 and ALDH2 did not affect urinary methylhippuric acid level in the exposed group (p>0.05). Conclusions : Exposure grade, smoking, drug use and kind of protective equipment affected urinary methylhippuric acid level, whereas genetic polymorphism of CYP2E1 and ALDH2 did not. However, further investigation for the effect of genetic polymorphism on the metabolism of xylene with a larger sample size is needed.

• 한국환경보건학회지
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• 제36권1호
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• pp.44-51
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• 2010

This study aimed to develop analytical method for 8-isoprostanes as biomarkers for oxidative stress with LC/MS/MS technique and to apply the method for human urine samples. Analyzed compounds for urinary oxidative stress markers were 7 stereo-isomers of prostaglandins and the internal standard (iso-$PGF_{2{\alpha}}-d_4$) was used to adjust the recovery rate. The method for determining urinary iso-$PGF_{2{\alpha}}$ consisted of solid phase extraction and LC/MS/MS detection. Separation of isomers of prostaglandins completed by porous graphitic carbon column and buffer solution. Detection limits for urinary markers of oxidative stress, iso-$PGF_{2{\alpha}}$ with LC/MS/MS were 0.01 ng/ml by S/N ratio 3 and 0.028 ng/ml by calculated as to FDA method. The recovery (92.8~101.9%) and precision (8.8~20.7%) of analysis were feasible for detecting iso-$PGF_{2{\alpha}}$ in real human urine samples. We detected 4 isomers of prostaglandins in human urine samples. Mean (standard deviation) of urinary iso-$PGF_{2{\alpha}}$ concentration were 0.231 (0.117) ng/mg creatinine for smoking group and 0.154 (0.082) ng/mg creatinine for non-smoking group.

• Nutrition Research and Practice
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• 제3권1호
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• pp.15-22
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• 2009

This study was performed to investigate the effect of chlorella on cadmium (Cd) toxicity in Cd-administered rats. Sixty male Sprague-Dawley rats (14 week-old) were blocked into 6 groups. Cadmium chloride was given at levels of 0 or 325 mg (Cd: 0, 160 ppm), and chlorella powder at levels of 0, 3 and 5%. Cadmium was accumulated in blood and tissues (liver, kidney and small intestine) in the Cd-exposed groups, while the accumulation of Cd was decreased in the Cd-exposed chlorella groups. Fecal and urinary Cd excretions were remarkably increased in Cd-exposed chlorella groups. Thus, cadmium retention ratio and absorption rate were decreased in the Cd exposed chlorella groups. Urinary and serum creatinine, and creatinine clearance were not changed in experimental animals. In addition, metallothionein (MT) synthesis in tissues was increased by Cd administration. The Cd-exposed chlorella groups indicated lower MT concentration compared to the Cd-exposed groups. Moreover, glomerular filtration rate (GFR) was not changed by dietary chI orella and Cd administration. According to the results above, this study could suggest that Cd toxicity can be alleviated by increasing Cd excretion through feces. Therefore, when exposed to Cd, chlorella is an appropriate source which counteracts heavy metal poisoning, to decrease the damage of tissues by decreasing cadmium absorption.

• Journal of Nutrition and Health
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• 제15권3호
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• pp.212-222
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• 1982

본(本) 연구자(硏究者)는 21세(歲)부터 25세(歲)까지의 건강(健康)한 여대생(女大生) 8명(名)을 대상(對象)으로 식이중(食餌中)의 단백질(蛋白質) 급원(給源)((동물성)(動物性)과 식물성(植物性) 단백질(蛋白質))을 달리했을 때 혈청중(血淸中)의 cholesterol 농도(濃度)와 triglyceride 농도(濃度) 및 24시간(時間) 뇨중(尿中)의 creatinine 농도(濃度)와 3-methylhistidine의 농도(濃度)에 미치는 영향(影響)을 살펴보았다. 조사대상자(調査對象者)들은 control diet와 meat diet와 textured soy protein (TSP) diet를 각(各) 3일씩 섭취(攝取)하였으며, 각(各) 식이(食餌)의 3일째 되는 날에는 24시간(時間) 뇨(尿)를 채취(採取)하였고, 4일째 되는 날 아침 식사(食事) 전에 채혈(採血)하여 분석(分析)한 결과(結果)는 다음과 같다. 1) 혈청(血淸) cholesterol 농도(濃度)는 meat diet 시에 control diet보다 현저(顯著)하게 증가(增加)하였으며 (P<0.05), TSP diet시에는 control diet 보다 현저(顯著)하게 감소(減少)하였고 (P<0.01) meat diet와 비교(比較)시에도 현저(顯著)하게 감소(減少)되었다(P<0.01). 2) 혈청(血淸) triglyceride 농도(濃度)는 meat diet 시에 control diet 보다 감소(減少) 되었으나, 유의적(有意的)인 차이(差異)는 없었고 meat diet와 비교(比較)시에는 현저(顯著)하게 감소(減少)되었다(P<0.01). 3) 뇨중(尿中)의 creatinine 농도(濃度)는 meat diet 시에 control diet보다 약간 증가(增加)했으나 유의적(有意的)인 차이(差異)는 없었다. TSP diet 시에는 control diet보다 약간 감소(減少)하였으나 유의적(有意的)인 차이(差異)는 없었고 meat diet와 비교(比較)시에는 현저(顯著)하게 감소(減少)되었다(P<0.05). 4) 뇨중(尿中)의 3-methylhistidine 농도(濃度)는 meat diet 시에 control diet보다 약간 증가(增加)했으나, 유의적(有意的)인 차이(差異)는 없었다. TSP diet 시에는 control diet보다 약간 감소(減少)하였으나 유의적(有意的)인 차이(差異)는 없었고 meat diet와 비교(比較)시에는 현저(顯著)하게 감소(減少)되었다 (P<0.05). 5) 3-methylhistidine가 creatinine의 비(比)는 control diet 보다 meat diet와 TSP diet 시에 약간 증가(增加)하였으나, 유의적(有意的)인 차이(差異)는 없었다.

• 생명과학회지
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• 제20권4호
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• pp.618-622
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• 2010

본 연구는 비소에 대한 만성노출이 의심되는 일부 폐금속광산 주변 지역 주민 중 여성들을 대상으로 요중 비소 농도와 산화적 유전자 손상지표인 요중 8-hydroxydeoxyguanosine (8-OHdG) 농도와의 관련성을 평가하기 위해 시행되었다. 충청북도에 위치한 두 폐금속광산 지역 주민 중 여성 165명을 대상으로 요중 비소농도와 요중 8-OHdG의 농도를 측정하고 SPSS 12.0 통계프로그램을 이용하여 분석하였다. 조사 대상자들의 요중 비소농도는 기하평균이 $5.65\;{\mu}g/g$ creatinine으로 나타났으며 요중 비소와 8-OHdG 농도와의 관련성 분석에서는 상관계수 0.399 (p<0.001)의 유의한 상관성을 보였다. 이러한 관련성은 비소노출 농도가 낮은 경우가 노출농도가 높은 경우에 비해 상대적으로 높은 것으로 나타났다. 본 연구의 결과는 요중 8-OHdG 농도가 저농도의 비소에 만성적으로 노출된 여성에서 산화적 유전자 손상을 평가하는 좋은 지표가 될 수 있음을 시사한다.

• 한국식품위생안전성학회지
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• 제24권4호
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• pp.378-384
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• 2009

카드뮴에 대한 다양한 인체안전기준이 알려지고 있고, 각 국가마다 신장기능이상을 나타내는 뇨 중 카드뮴 농도에 차이를 나타내고 있어 국내의 역학자료를 고려한 카드뮴 인체안전기준을 검토 제안하므로 위해관리의 효율을 향상시키고자 본 연구를 수행하였다. WHO, USEPA, ATSDR에서 식이섭취량과 뇨 중 카드뮴 농도와의 상관관계를 PBPK 모델로 정립 제안한 방법 등이 검토되었으며, 최종적으로 WHO의 1일 인체섭취량 산출 모델에 따라 계산하였다. 국내 역학자료(병산리 폐광지역 인체역학조사)에 의하면 뇨 중 카드뮴 최고농도인 11.63 ug/g creatinine 수준에서도 단백뇨 등의 신장기능이상이 확인되지 않아, WHO 등 국외 역학자료를 검토하여 신장이상을 나타내기 시작하는 뇨 중 카드뮴 농도를 2.5 ug/g creatinine으로 결정하였다. 카드뮴 오염원 노출과 무관할 것으로 예측되는 우리나라 성인의 뇨 중 카드뮴 수준 0.38 ug/g creatinine과 최근에 평가된 식품섭취를 통한 카드뮴 섭취량(8.3~10.4 ug/day)의 비율이 21.8~27.3 수준에 해당됨을 확인하여 이를 WHO에서 제안된 모델에 적용하였다. 식이섭취량과 신장 이상과의 상관관계 중 카드뮴 생체이용률 10%, 흡수된 카드뮴의 배출량을 50%로 가정한 결과를 국내 인체안전기준 설정에 적용한 결과(이 가정에서 사용된 식이섭취량에 대한 뇨 중 카드뮴 농도의 비율은 24), 신장이상이 발생되기 시작하는 뇨 중 카드뮴 농도인 2.5 ug/g creatinine에 대해 예측된 카드뮴 1일 섭취량은 1 ug/kg bw/day여서, 이를 근거로 국내 카드뮴 PTWI를 7 ug/kg bw/week로 제안하였다.

• 한국산업보건학회지
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• 제17권3호
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• pp.235-244
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• 2007

By comparing the proteins from the workers exposed to styrene with the ones from controls, it may be possible to identify proteins that play a role in the occurrence and progress of occupational disease and thus to study the molecular mechanisms of occupational disease. In order to find the biomarkers for assessing the styrene effects early, before clinical symptoms develop and to understand the mechanisms of adverse health effects, we surveyed 134 employees, among whom 52 workers(30 male and 22 female) were chronically exposed to styrene in 10 glass-reinforced plastic boat manufacturing factories in Korea and 82 controls had never been occupationally exposed to hazardous chemicals including styrene. The age and drinking habits and serum biochemistry such as total protein, BUN and serum creatinine in both groups were significantly different. Exposed workers were divided into three groups according to exposure levels of styrene(G1, below 1/2 TLV; G2, 1/2 TLV to TLV; G3, above TLV). The mean concentration of airborne styrene in G1 group was $10.93{\pm}11.33ppm$, and those of urinary mandelic acid(MA) and phenylglyoxylic acid(PGA) were $0.17{\pm}0.21$ and $0.13{\pm}0.11g/g$ creatinine, respectively. The mean concentration of airborne styrene in G2 and G3 groups were $47.54{\pm}22.43$ and $65.33{\pm}33.47ppm$, respectively, and levels of urinary metabolites such as MA and PGA increased considerably as expected with the increase in exposure level of styrene. The airborne styrene concentration were significantly correlated to the urinary concentration of MA(r=0.784, p=0.000) and PGA(r=0.626, p<0.001). In the 2D electrophoresis, the concentration of five proteins including complement C3 precursor, alpha-1-antitrypsin(AAT), vitamin D binding protein precursor(DBP), alpha-1-B-glycoprotein(A1BG) and inter alpha trypsin inhibitor(ITI) heavy chain-related protein were significantly altered in workers exposed to styrene compared with controls. While expression of complement C3 precursor and AAT increased by exposure to styrene, expression of DBP, A1BG and ITI heavy chain-related protein decreased. These results suggest that the exposure of styrene might affects levels of plasma proteinase, carriers of endogenous substances and immune system. In particular, increasing of AAT with the increase in exposure level of styrene can explain the tissue damage and inflammation by the imbalance of proteinase/antiproteinase and decrease of DBP, A1BG and ITI heavy chain-related protein in workers exposed to styrene is associated with dysfunction and/or declination in immune system and signal transduction