Association between H3K4me3/BDNF and the cognitive function of workers occupationally exposed to aluminum
Author(s): Qiu Hengying, Ren Pei, Li Rui, Zhang Qinli, Lu Xiaoting, Niu Qiao
Pages: 900-904
Year: 2016 Issue: 12
Journal: Chinese Journal of Industrial Hygiene and Occupational Diseases
Keyword: Aluminum; Occupational exposure; Cognition; H3K4me3; BDNF;
Abstract: Objective To investigate the influence of occupational aluminum exposure on cogmtive function and its relationship with tri-methyl histone H3 lysine residues 4 points (H3K4me3) and brain-derived neurotrophic factor (BDNF) levels.Methods By cluster random sampling method,a total of 235 cases of male workers selected from a Shanxi aluminum factory were recruited in the study in September 2015.Used the occupational epidemiological investigation questionnaire,which included Mini-Mental State Examination (MMSE),Clock Drawing Test (CDT),Digit Span Test (DST,including forward test DSFT and backward test DSBT),Fuild Object Memory Evaluation (FOME) and Verbal Fluency Test (VFT),to collect workers' basic information and assess their cognitive function score.Detected the concentration of aluminum in plasma by graphite furnace atomic absorption spectrometry.Workers were divided into three groups by the 25 percentile and 75 percentile of the aluminum content,such as low,middle and high aluminum concentration groups.The concentrations of H3K4me3 in lymphocyte and BDNF in plasma were determined by enzyme-linked immunosorbent assay.Results The levels of aluminum in plasma was 134.36 (100.14,178.96) μg/L.The scores of MMSE,DSFT,DSBT,DST of high aluminum concentration group were lower than low aluminum group (27.98±1.25 vs 28.83±1.54,9.19±2.00 vs 10.64±2.87,6.08±1.63 vs 7.19±3.07,15.27±3.11 vs 17.81±4.72,all P＜0.05),the scores of CDT,FOME,VFT among three groups had no statistical significance (all P＞0.05).The expression levels of H3K4me3 and BDNF of high aluminum concentration group were lower than the low group [(18.45±9.81) ng/μg Pro vs (23.76±9.89) ng/μg Pro,(26.07±10.18) ng/ml vs (31.66±9.24) ng/ml,all P＜0.05].Multiple correlation analysis showed that aluminum concentration were negatively correlated to H3K4me3,BDNF,MMSE,DSFT,DST,respectively (rs =-0.307、-0.214、-0.252、-0.197,-0.181,all P＜0.01).Conclusion Exposure to occupational aluminum for a long time may change cognitive function,which go along with the decreasing of H3K4me3 level in lymphocyte and BDNF protein expression in plasma.
Pages: 900-904
Year: 2016 Issue: 12
Journal: Chinese Journal of Industrial Hygiene and Occupational Diseases
Keyword: Aluminum; Occupational exposure; Cognition; H3K4me3; BDNF;
Abstract: Objective To investigate the influence of occupational aluminum exposure on cogmtive function and its relationship with tri-methyl histone H3 lysine residues 4 points (H3K4me3) and brain-derived neurotrophic factor (BDNF) levels.Methods By cluster random sampling method,a total of 235 cases of male workers selected from a Shanxi aluminum factory were recruited in the study in September 2015.Used the occupational epidemiological investigation questionnaire,which included Mini-Mental State Examination (MMSE),Clock Drawing Test (CDT),Digit Span Test (DST,including forward test DSFT and backward test DSBT),Fuild Object Memory Evaluation (FOME) and Verbal Fluency Test (VFT),to collect workers' basic information and assess their cognitive function score.Detected the concentration of aluminum in plasma by graphite furnace atomic absorption spectrometry.Workers were divided into three groups by the 25 percentile and 75 percentile of the aluminum content,such as low,middle and high aluminum concentration groups.The concentrations of H3K4me3 in lymphocyte and BDNF in plasma were determined by enzyme-linked immunosorbent assay.Results The levels of aluminum in plasma was 134.36 (100.14,178.96) μg/L.The scores of MMSE,DSFT,DSBT,DST of high aluminum concentration group were lower than low aluminum group (27.98±1.25 vs 28.83±1.54,9.19±2.00 vs 10.64±2.87,6.08±1.63 vs 7.19±3.07,15.27±3.11 vs 17.81±4.72,all P＜0.05),the scores of CDT,FOME,VFT among three groups had no statistical significance (all P＞0.05).The expression levels of H3K4me3 and BDNF of high aluminum concentration group were lower than the low group [(18.45±9.81) ng/μg Pro vs (23.76±9.89) ng/μg Pro,(26.07±10.18) ng/ml vs (31.66±9.24) ng/ml,all P＜0.05].Multiple correlation analysis showed that aluminum concentration were negatively correlated to H3K4me3,BDNF,MMSE,DSFT,DST,respectively (rs =-0.307、-0.214、-0.252、-0.197,-0.181,all P＜0.01).Conclusion Exposure to occupational aluminum for a long time may change cognitive function,which go along with the decreasing of H3K4me3 level in lymphocyte and BDNF protein expression in plasma.
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