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Benchmark Dose Assessment for Coke Oven Emissions-Induced Mitochondrial DNA Copy Number Damage Effects. | LitMetric
Objective : The study aimed to estimate the benchmark dose (BMD) of coke oven emissions (COEs) exposure based on mitochondrial damage with the mitochondrial DNA copy number (mtDNAcn) as a biomarker.Methods : A total of 782 subjects were recruited, including 238 controls and 544 exposed workers. The mtDNAcn of peripheral leukocytes was detected through the real-time fluorescence-based quantitative polymerase chain reaction. Three BMD approaches were used to calculate the BMD of COEs exposure based on the mitochondrial damage and its 95% confidence lower limit (BMDL).Results : The mtDNAcn of the exposure group was lower than that of the control group (0.60 ± 0.29 1.03 ± 0.31; < 0.001). A dose-response relationship was shown between the mtDNAcn damage and COEs. Using the Benchmark Dose Software, the occupational exposure limits (OELs) for COEs exposure in males was 0.00190 mg/m . The OELs for COEs exposure using the BBMD were 0.00170 mg/m for the total population, 0.00158 mg/m for males, and 0.00174 mg/m for females. In possible risk obtained from animal studies (PROAST), the OELs of the total population, males, and females were 0.00184, 0.00178, and 0.00192 mg/m , respectively.Conclusion : Based on our conservative estimate, the BMDL of mitochondrial damage caused by COEs is 0.002 mg/m . This value will provide a benchmark for determining possible OELs.
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