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研究生(外文):Ming-Hsiu Lin
論文名稱(外文):The lung effect and oxidative damage of free silicaexposure among foundry workers
指導教授(外文):Saou-Hsing Liou
外文關鍵詞:free silicafoundry worker8-hydroxy-deoxyguanosineDNA damagecytokines
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本研究收集A、B、C鑄造廠廠研究對象共74人,進行胸部X光、肺功能、血液常規、生化、氧化傷害等檢查,了解肺功能與飲食攝取、氧化傷害、抗氧化能力指標、職場暴露、身體質量指數(BMI)等相關性。結果發現,肺功能中第一秒用力呼氣容量(FEV1)、FEV1%pred、一秒量率(FEV1/FVC%)與職場粉塵累積暴露濃度、BMI等趨勢分佈皆達顯著負相關。另外,針對A廠進行工廠作業環境改善及追蹤該廠作業員工之肺功能及8-OHdG濃度,在作業環境改善後三個月再次進行一次肺功能及尿中8-OHdG等檢查。結果發現, A鑄造廠在環境改善後可呼吸粉塵濃度及游離二氧化矽有減少之現象,針對同樣的研究對象進行肺功能指標重複施測,發現其肺功能指標FEV1、用力肺容量(FVC)、FEV1%pred、FVC%pred在作業環境改善後有明顯的增加,並達統計顯著差異。在針對B鑄造廠勞工DNA損傷、免疫毒性及職場暴露之分析方面,在校正一些干擾因子(如年齡、籍貫、教育程度、吸菸情形及維他命E使用情形等)後,發現累積暴露量與DNA傷害四參數,頭尾比例、尾部長度、尾部動量、Oliver尾矩皆具有統計上顯著意義。至於勞工細胞激素分佈方面,將年齡、籍貫、吸菸情形、BMI及是否罹患矽肺症等因子納入複迴歸分析模式中,可以了解白介素-2(IL-2)及白介素-10(IL-10)與是否罹患矽肺症具有統計上之顯著意義;即罹患矽肺症(含1/0以上)之勞工較未罹患矽肺症之勞工有較高IL-2、IL-10。

Laborer workers are exposed to free silica long-term and lead to an increased risk of silicosis and lung cancer. Epidemiological and animal studies support that, then less research resulting from an engineering intervention to assess the health effect. The primary aim of this study was to evaluate changes in lung function and oxidative damage markers following the introduction of an engineering control intervention , whilst urinary 8-hydroxy-deoxyguanosine (8-OHdG) was used as a measure of oxidative DNA damage.
My study population was 74 male from 3 foundries in Taiwan. All subjects were carried on such inspections as chest X-rays, lung function, blood routine, oxidative damage,etc, in order to discuss the effects of dust exposure and BMI on foundry workers’ lung function and to determine whether the intake of dietary vitamins has any significant impact in improving lung function and anti-oxidant plasma activity. Our findings revealed that the lung function, FEV1, FEV1%pred and FEV1/FVC% of foundry workers is negatively affected by having a higher BMI and by exposure to dust. In addition, I studied one of 3 foundries before, and three months after, improvements to air exhaust control. Initial baseline biomarker measurements were taken of lung function and urinary 8-OHdG in all of the workers, with follow up measurements taken three months after the engineering control was put in place. Compared to initial baseline, significant improvements were found in lung function (FVC, FEV1, FVC%pred and FEV1%pred) amongst the workers after the engineering intervention to reduce the silica level. I estimated DNA damage by comet assay for another planet, after confounders were adjusted, A significant increase in L/H, TL, ETM, OTM of DNA damage with cumulative silica exposure. From the result of cytokines showed that the significant higher concentration of IL-2 and IL-10 in silicosis subjects (equal and more than ILO 1/0) than health workers.
These findings indicate that significant improvements in lung function among a small group of foundry workers following the implementation of an engineering intervention that effectively reduced the levels of respirable silica dust. These results suggest that engineering controls aimed at reducing occupational exposure to silica represent an effective approach that may have immediate benefits to workers.

第一章 緒論 1
第一節 研究背景 1
第二節 研究目的 3
第二章 文獻探討 5
第一節 游離二氧化矽特性 5
第二節 游離二氧化矽之流行病學研究 6
第三節 游離二氧化矽與氧化傷害 8
第四節 游離二氧化矽之基因毒性 12
第五節 影響肺功能表現之生活因子 18
第三章 材料與方法 21
第一節 研究設計與對象 21
第二節 實驗流程與原理 21
第三節 資料處理與統計方法 30
第四章 結果與討論 32
第一節 研究對象之基本資料及肺功能健康 32
第二節 肺功能測量、飲食及職場暴露之相關性 37
第三節 A鑄造廠實際現場改善 42
第四節 作業環境改善與生物性指標之變化 45
第五節 B鑄造廠DNA損傷、免疫毒性及職場暴露之相關分析 48
第五章 結論與建議 53
參考文獻 55
附錄一 問卷資料 103
附錄二 期刊論文 111

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