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Xiong H.,Sun Yat Sen University | Pang J.,Sun Yat Sen University | Yang H.,Sun Yat Sen University | Dai M.,Southern Medical University | And 8 more authors.
Neurobiology of Aging | Year: 2015

The molecular mechanisms underlying age-related hearing loss are not fully understood, and currently, there is no treatment for this disorder. MicroRNAs have recently been reported to be increasingly associated with age-related diseases and are emerging as promising therapeutic targets. In this study, miR-34a/Sirtuin 1 (SIRT1)/p53 signaling was examined in cochlear hair cells during aging. MiR-34a, p53 acetylation, and apoptosis increased in the cochlea of C57BL/6 mice with aging, whereas an age-related decrease in SIRT1 was observed. In the inner ear HEI-OC1 cell line, miR-34a overexpression inhibited SIRT1, leading to an increase in p53 acetylation and apoptosis. Moreover, miR-34a knockdown increased SIRT1 expression and diminished p53 acetylation, and apoptosis. Additionally, resveratrol, an activator of SIRT1, significantly rescued miR-34a overexpression-induced HEI-OC1 cell death and significantly reduced hearing threshold shifts and hair cell loss in C57BL/6 mice after a 2-month administration. Our results support a link between age-related cochlear hair cell apoptosis and miR-34a/SIRT1/p53 signaling, which may serve as a potential target for age-related hearing loss treatment. © 2015 Elsevier Inc.


Lin Q.,Guangzhou Occupational Disease Prevention and Treatment Center | Jiang C.,Guangzhou Occupational Disease Prevention and Treatment Center | Liu Y.,Guangzhou Occupational Disease Prevention and Treatment Center | Guo J.,Guangzhou Occupational Disease Prevention and Treatment Center | Lam T.H.,Guangzhou Occupational Disease Prevention and Treatment Center
Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases | Year: 2013

OBJECTIVE: To investigate the influential factors for job burnout among the managerial staff in a Sino-Japanese joint venture automobile manufacturer in Guangzhou, China.METHODS: A total of 288 managers in a Sino-Japanese joint venture automobile manufacturer were surveyed using the Occupational Stress Indicator, Maslach Burnout Inventory (MBI), Eysenck Personality Questionnaire, Simplified Coping Style Questionnaire, and Social Support Rating Scale.RESULTS: On the depersonalization dimension, the male managers had significantly higher scores than the female managers. The scores of emotion exhaustion and depersonalization of MBI showed significant differences among the managers with different levels of occupational stress. The path analysis showed that occupational stress, neuroticism, and psychoticism had negative effects on emotion exhaustion, while job satisfaction and utilization of social support had direct positive effects on emotion exhaustion. Occupational stress, psychoticism, and passive coping style had direct negative effects on depersonalization, while job satisfaction, objective support, and utilization of social support had positive effects on depersonalization. Job satisfaction and active coping style had positive effects on sense of personal accomplishment, while passive coping style had a negative effect on sense of personal accomplishment. Personality exerted its effect on social support through coping style and thus on job satisfaction and job burnout.CONCLUSION: Male managers have a greater propensity to depersonalization than their female counterparts. High occupational stress is a risk factor for job burnout. Personality, social support, and coping style are influential factors for job burnout.


Lin Q.H.,Guangzhou Occupational Disease Prevention and Treatment Center
Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases | Year: 2012

To study the influential factors on psychosocial health of the migrant workers in Guangzhou. The Symptom Checklist 90 (SCL-90) and Eysenck Personality Questionnaire (EPQ) were used to investigate 518 migrant workers in Guangzhou. The rate of migrant workers with psychosocial problems was 36.5%. The scores of SCL-90 and positive rates in migrant workers with the different personality types had significant difference (P < 0.01). The results of binary logistic regression analysis indicated that the working years, drinking, sex, P scores, E scores and N scores of EPQ were main predictors of the poor physical fitness status. The vocations, working years, P scores and N scores of EPQ were strong predictors of the somatization. he vocations, P scores and N scores of EPQ were strong predictors of the obsessive compulsive symptom. The smoking, P scores and N scores of EPQ were strong predictors of the interpersonal sensitivity. The working years, P scores of EPQ were strong predictors of the depression. P scores of EPQ was strong predictors of the anxiety. P scores, E scores and N scores of EPQ were strong predictors of the hostility. The working years, smoking, P scores, E scores and N scores of EPQ were strong predictors of the phobic anxiety. The working years, P scores of EPQ were strong predictors of the paranoid ideation. The working years, P scores and N scores of EPQ were strong predictors of the psychosis. The level of mental health of the migrant workers was significantly associated with the personality. The results of present study indicated that different vocation, sex, working years, smoking and drinking might interfere with the psychological states. The migrant workers with the personality of psychoticism, neuroticism and introversion may have unhealthy mental reaction.


Lin Q.H.,Guangzhou Occupational Disease Prevention and Treatment Center
Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases | Year: 2012

To analyze the epidemiological characteristics of occupational diseases in Guangzhou City, China in 2001 - 2010, and to provide a scientific basis for the prevention and control of occupational diseases. Statistical analysis was performed on the reported data on the occupational diseases in Guangzhou from 2001 to 2010. A total of 380 cases of occupational diseases (37 types,8 classes) were diagnosed and reported in 2001 - 2010. The three most frequent diseases were occupational poisonings (48.9%), pneumoconiosis (20.0%), and occupational ear, nose, and throat (ENT) diseases (18.7%). In the cases of occupational poisonings, 25.3% suffered from acute occupational poisonings, especially the poisoning by dichloroethane (19.1%), and 74.7% suffered from chronic occupational poisonings, mainly caused by lead (38.8%), benzene (37.4%), and n-hexane (18.0%). The cases of silicosis accounted for 77.6% of all cases of pneumoconiosis. The cases of noise-induced deafness accounted for 97.2% of all cases of occupational ENT diseases. Patients with occupational diseases were reported in 13 districts of Guangzhou, mostly in Panyu (18.9%), Tianhe (13.2%), Baiyun (12.9%), and Liwan (11.1%). All the cases occurred in 19 industries, mainly including light industry (27.1%) and machinery industry (23.7%). Of all cases, 29.5% were in the public sector, 40.3% in the private sector, and 30.3% in the foreign-funded enterprises and those funded by businessmen from Hong Kong, Macao, and Taiwan. The ratio of male to female cases was 15:4. The mean age of onset was 42.2 ± 10.9 years. The average speed of development of occupational diseases was 134.0%, and the average growth rate was 34.0%. The incidence of occupational diseases tends to increase year by year, with younger age of onset and shorter history of exposure in patients. The occupational poisonings caused by lead, benzene, n-hexane, and dichloroethane, silicosis, and noise-induced deafness seem to be the main occupational hazards in Guangzhou, China. Occupational diseases occur in all districts of Guangzhou and in various industries. The private sector and small enterprises should be the focuses of occupational health supervision.


Liang J.,Guangzhou Occupational Disease Prevention and Treatment Center | Zhang J.,Guangzhou Occupational Disease Prevention and Treatment Center | Guo X.,Guangzhou Occupational Disease Prevention and Treatment Center | Mai J.,Guangzhou Occupational Disease Prevention and Treatment Center | And 2 more authors.
Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases | Year: 2014

OBJECTIVE: To identify the occupational hazard factors in an accumulator factory, to analyze the status of internal and external lead exposure and evaluate the impact of lead exposure on the health of workers in the accumulator industry, and to provide a theoretical basis for improved lead exposure criteria and technical support for the control of lead contamination in the accumulator industry.METHODS: An on-site investigation was carried out to monitor and evaluate the lead fume and dust in the workplaces of an accumulator factory, and occupational health examination was performed in all workers.RESULTS: The occupational hazard safeguards in the accumulator factory were unadvanced. The contamination of lead fume and dust was serious. The abnormal rate of blood lead was up to 79.80%, and many workers developed anemia and mild peripheral nerve disease.CONCLUSION: Lead contamination is serious in the accumulator factory, leading to poor health of workers. It is essential to take effective control measures, improve the working environment, provide occupational health education, increase workers' self-protection awareness, and periodically conduct occupational hazard monitoring and health surveillance. The government must reinforce occupational health supervision of such enterprises.


PubMed | Guangzhou Occupational Disease Prevention and Treatment Center
Type: Journal Article | Journal: Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases | Year: 2013

To investigate the influential factors for job burnout among the managerial staff in a Sino-Japanese joint venture automobile manufacturer in Guangzhou, China.A total of 288 managers in a Sino-Japanese joint venture automobile manufacturer were surveyed using the Occupational Stress Indicator, Maslach Burnout Inventory (MBI), Eysenck Personality Questionnaire, Simplified Coping Style Questionnaire, and Social Support Rating Scale.On the depersonalization dimension, the male managers had significantly higher scores than the female managers. The scores of emotion exhaustion and depersonalization of MBI showed significant differences among the managers with different levels of occupational stress. The path analysis showed that occupational stress, neuroticism, and psychoticism had negative effects on emotion exhaustion, while job satisfaction and utilization of social support had direct positive effects on emotion exhaustion. Occupational stress, psychoticism, and passive coping style had direct negative effects on depersonalization, while job satisfaction, objective support, and utilization of social support had positive effects on depersonalization. Job satisfaction and active coping style had positive effects on sense of personal accomplishment, while passive coping style had a negative effect on sense of personal accomplishment. Personality exerted its effect on social support through coping style and thus on job satisfaction and job burnout.Male managers have a greater propensity to depersonalization than their female counterparts. High occupational stress is a risk factor for job burnout. Personality, social support, and coping style are influential factors for job burnout.


PubMed | Guangzhou Occupational Disease Prevention and Treatment Center
Type: Journal Article | Journal: Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases | Year: 2010

To study relationships between personality and occupational stress of workers in processing line in Guangzhou.452 workers in processing line in Guangzhou were investigated by the Eysenck Personality Questionnaire (EPQ) and Occupational Stress Indicator (OSI).N scores and P scores of EPQ were positively correlated with the occupational stress and the poor physical fitness status (r value was 0.196, 0.128, 0.202, 0.218, respectively) (P < 0.01). N scores of EPQ were positively correlated with the type A behavior (r = 0.164) and negatively correlated with the mental well-being level (r = -0.196, P < 0.01). P scores of EPQ were negative correlated with the sense of job satisfaction and the stress coping ability(r value was -0.146, -0.140, respectively) (P < 0.01). E scores and L scores of EPQ were negatively correlated with the type A behavior (r value was -0.159, -0.138, respectively) (P < 0.01). E scores of EPQ were positively correlated with the stress coping ability (r = 0.176, P < 0.01). L scores of EPQ were negatively correlated with the occupational stress, the poor physical fitness status and the explanation to vicinity event (r value was -0.139, -0.140, -0.111, respectively) (P < 0.01, P < 0.05).The personality of neuroticism, psychoticism and introversion may be related to the occupational stress, the sense of job satisfaction and unhealthy mental reaction.


PubMed | Guangzhou Occupational Disease Prevention and Treatment Center
Type: Journal Article | Journal: Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases | Year: 2012

To study the influential factors on psychosocial health of the migrant workers in Guangzhou.The Symptom Checklist 90 (SCL-90) and Eysenck Personality Questionnaire (EPQ) were used to investigate 518 migrant workers in Guangzhou.The rate of migrant workers with psychosocial problems was 36.5%. The scores of SCL-90 and positive rates in migrant workers with the different personality types had significant difference (P < 0.01). The results of binary logistic regression analysis indicated that the working years, drinking, sex, P scores, E scores and N scores of EPQ were main predictors of the poor physical fitness status. The vocations, working years, P scores and N scores of EPQ were strong predictors of the somatization. he vocations, P scores and N scores of EPQ were strong predictors of the obsessive compulsive symptom. The smoking, P scores and N scores of EPQ were strong predictors of the interpersonal sensitivity. The working years, P scores of EPQ were strong predictors of the depression. P scores of EPQ was strong predictors of the anxiety. P scores, E scores and N scores of EPQ were strong predictors of the hostility. The working years, smoking, P scores, E scores and N scores of EPQ were strong predictors of the phobic anxiety. The working years, P scores of EPQ were strong predictors of the paranoid ideation. The working years, P scores and N scores of EPQ were strong predictors of the psychosis.The level of mental health of the migrant workers was significantly associated with the personality. The results of present study indicated that different vocation, sex, working years, smoking and drinking might interfere with the psychological states. The migrant workers with the personality of psychoticism, neuroticism and introversion may have unhealthy mental reaction.


PubMed | Guangzhou Occupational Disease Prevention and Treatment Center
Type: Journal Article | Journal: Zhonghua lao dong wei sheng zhi ye bing za zhi = Zhonghua laodong weisheng zhiyebing zazhi = Chinese journal of industrial hygiene and occupational diseases | Year: 2012

To analyze the epidemiological characteristics of occupational diseases in Guangzhou City, China in 2001 - 2010, and to provide a scientific basis for the prevention and control of occupational diseases.Statistical analysis was performed on the reported data on the occupational diseases in Guangzhou from 2001 to 2010.A total of 380 cases of occupational diseases (37 types,8 classes) were diagnosed and reported in 2001 - 2010. The three most frequent diseases were occupational poisonings (48.9%), pneumoconiosis (20.0%), and occupational ear, nose, and throat (ENT) diseases (18.7%). In the cases of occupational poisonings, 25.3% suffered from acute occupational poisonings, especially the poisoning by dichloroethane (19.1%), and 74.7% suffered from chronic occupational poisonings, mainly caused by lead (38.8%), benzene (37.4%), and n-hexane (18.0%). The cases of silicosis accounted for 77.6% of all cases of pneumoconiosis. The cases of noise-induced deafness accounted for 97.2% of all cases of occupational ENT diseases. Patients with occupational diseases were reported in 13 districts of Guangzhou, mostly in Panyu (18.9%), Tianhe (13.2%), Baiyun (12.9%), and Liwan (11.1%). All the cases occurred in 19 industries, mainly including light industry (27.1%) and machinery industry (23.7%). Of all cases, 29.5% were in the public sector, 40.3% in the private sector, and 30.3% in the foreign-funded enterprises and those funded by businessmen from Hong Kong, Macao, and Taiwan. The ratio of male to female cases was 15:4. The mean age of onset was 42.2 10.9 years. The average speed of development of occupational diseases was 134.0%, and the average growth rate was 34.0%.The incidence of occupational diseases tends to increase year by year, with younger age of onset and shorter history of exposure in patients. The occupational poisonings caused by lead, benzene, n-hexane, and dichloroethane, silicosis, and noise-induced deafness seem to be the main occupational hazards in Guangzhou, China. Occupational diseases occur in all districts of Guangzhou and in various industries. The private sector and small enterprises should be the focuses of occupational health supervision.

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