Junctional adhesion molecule-like protein as a novel target for kaempferol to ameliorate lung adenocarcinoma / 中西医结合学报

OBJECTIVE@#Although there have been improvements in targeted therapy and immunotherapy, the majority of lung adenocarcinoma (LUAD) patients still lack effective therapies. Consequently, it is urgent to screen for new diagnosis biomarkers and pharmacological targets. Junctional adhesion molecule-like protein (JAML) was considered to be an oncogenic protein and may be a novel therapeutic target in LUAD. Kaempferol is a natural flavonoid that exhibits antitumor activities in LUAD. However, the effect of kaempferol on JAML is still unknown.@*METHODS@#Small interfering RNA was used to knockdown JAML expression. The cell viability was determined using the cell counting kit-8 assay. The proliferation of LUAD cells was evaluated using the 5-ethynyl-2'-deoxyuridine incorporation assay. The migration and invasion of LUAD cells were evaluated by transwell assays. Molecular mechanisms were explored by Western blotting.@*RESULTS@#JAML knockdown suppressed proliferation, migration and invasion of LUAD cells, and JAML deficiency restrained epithelial-mesenchymal transition (EMT) via inactivating the phosphoinositide 3-kinase/protein kinase B/mammalian target of rapamycin (PI3K/AKT/mTOR) pathway. Using a PI3K activator (740Y-P), rescue experiments showed that phenotypes to JAML knockdown in LUAD cells were dependent on the PI3K/AKT/mTOR pathway. Kaempferol also inhibited proliferation, migration and invasion of A549 and H1299 cells and partially suppressed EMT through the PI3K/AKT/mTOR pathway. Knockdown of JAML ameliorated the inhibitory effect of kaempferol on LUAD cells. Kaempferol exerted anticancer effects by targeting JAML.@*CONCLUSION@#JAML is a novel target for kaempferol against LUAD cells. Please cite this article as: Wu Q, Wang YB, Che XW, Wang H, Wang W. Junctional adhesion molecule-like protein as a novel target for kaempferol to ameliorate lung adenocarcinoma. J Integr Med. 2023; 21(3): 268-276.

First report of invasive Pomacea snails in Shandong Province / 中国血吸虫病防治杂志

Objective To characterize the species of invasive Pomacea snails that were discovered for the first time in Shandong Province. Methods Pomacea snails samples were collected in the field of Jining City, Shandong Province on October 2021 for morphological identification. Pomacea snails were randomly sampled and genomic DNA was extracted from foot muscle tissues of Pomacea snails for multiplex PCR amplification. The PCR amplification product was sequenced. Then, the sequence was aligned and a phylogenetic tree was created using the software MegAlign 7.1.0. In addition, Angiostongylus cantonensis infection was detected in Pomacea snails with the lung microscopy. Results A total of 104 living Pomacea snails were collected, and all were characterized as Pomacea spp. based on morphological features. Of 12 randomly selected adult Pomacea snails, multiplex PCR assay and sequencing identified eleven snails as P. canaliculata and one as P. maculata. No A. cantonensis infection was detected in 104 Pomacea snails. Conclusion This is the first report of invasive Pomacea snails in Shandong Province, where P. canaliculata and P. maculata are found.

Surveillance of Enterobius vermicularis infections among children in Shandong Province from 2016 to 2020 / 中国血吸虫病防治杂志

Objective To investigate the prevalence and changing trend of Enterobius vermicularis infections among children in Shandong Province, so as to provide the scientific evidence for the adjustment and development of the enterobiasis control strategy. Methods Soil-borne nematodiasis surveillance sites were assigned in 51 counties (districts, cities) in Shandong Province from 2016 to 2020, and the E. vermicularis infections were detected using a modified Kato-Katz technique and the cellophane tape method among children at ages of 3 to 9 years living in these surveillance sites. The epidemiological profiles of E. vermicularis-infected children were descriptively analyzed. Results A total of 5 060 children at ages of 3 to 9 years were detected in 51 soil-borne nematodiasis surveillance sites in Shandong Province from 2016 to 2020, and the overall prevalence of E. vermicularis infections was 2.23%. The annual prevalence of E. vermicularis infections was 3.99% (26/651), 1.70% (14/824), 0.96% (8/837), 2.90% (45/1 552) and 1.67% (20/1 196) from 2016 to 2020, respectively, with a significant difference detected among years ( χ2 = 21.455, P < 0.01). The prevalence of E. vermicularis infections was 1.25% (15/1 198), 1.85% (14/755), 3.18% (84/2 640) and 0 (0/467) among children from central, eastern, southern and northern Shandong Province (χ2 = 27.326, P < 0.01). In addition, there was no significant difference in the prevalence of E. vermicularis infections between male (1.98%, 56/2 831) and female children (2.56%, 57/2 229) (χ2 = 1.916, P > 0.05); however, there was age-specific prevalence of E. vermicularis infections among children (χ2 = 16.448, P < 0.05), with the greatest prevalence detected among children at ages of 6 years (3.18%, 25/786), and the lowest prevalence seen among children at ages of 3 years (0.75%, 6/800). Conclusions The prevalence of E. vermicularis infections remained at a medium level among children at ages of 3 to 9 years in Shandong Province from 2016 to 2020, with region-specific prevalence found across the province. An integrated strategy is required for enterobiasis control.

Analysis of influencing factors of metabolic syndrome in male occupational population in mineral industry / 中国职业医学

OBJECTIVE: To study the prevalence and influencing factors of metabolic syndrome(MS) in male occupational population in the mineral industry. METHODS: A total of 2 654 male employees in the mining area of a mining group in Xingtai City were selected as the study subjects using the convenient sampling method. The general demographic data, behavior and lifestyle, work status, and biochemical examination results of the study subjects were collected, and the influencing factors of MS were analyzed by multi-factor logistic regression. RESULTS: The detection rate of MS was 16.0%(425/2 654) in these 2 654 male workers. The detection rate of MS increased with age and length of service(all P<0.05). The detection rate of MS in male workers with hypertension, high blood sugar, central obesity, high triglyceride and low high-density lipoprotein was higher than that in control workers(all P<0.01). The results of multivariate logistic regression analysis showed that age, work shifts, salt intake, dietary habit, alcohol drinking, sleep time, physical exercise, and body mass index were all influencing factors for MS(all P<0.05). CONCLUSION: Male workers have a high incidence of MS. Older age, shift work, high-salt diet, meat-based diet, alcohol drinking, severely insufficient sleep time, and overweight/obesity increase the risk of MS in male workers.

Dose-response relationship between light at night and nonalcoholic fatty liver in steel workers / 中华疾病控制杂志

Objective To explore the relationship between light at night (LAN) and nonalcoholic fatty liver (NAFLD) in steel workers. Methods Relevant information was collected through questionnaires, physical examinations and blood biochemical analysis. Using restricted cubic spline (RCS) and mutiple Logistic regression model to explore the relationship between LAN and NAFLD based on a cross-sectional study. Results The prevalence of NAFLD was 33.8% (2 594 / 7 664) in steel workers. After adjusting for age, sex, marriage, educational level, smoking, drinking, body mass index, luminous intensity in life, liver enzyme metabolism, blood lipid level, physical activity, diet, sleep duration, shift work, high temperature, noise, dust, and carbon monoxide exposure, the RCS model showed a nonlinear dose-response relationship between LAN and NAFLD ( 2=71.59, P<0.001 for overall association test and 2=16.92, P<0.001 for nonlinear test); Multivariate Logistic regression model showed that after adjusting for all confounding factors, when the LAN in the 1 178 d ~ 2 017 d and 2 017 d ~ group, the prevalence of NAFLD increased by 21.7% (OR=1.217, 95% CI: 1.027-1.441) and 47.9% (OR=1.479, 95% CI: 1.240-1.763), respectively, when compared with the group LAN<1 178 d. Conclusion There is a nonlinear dose-response relationship between LAN and NAFLD in steel works.

[Epidemiological analysis of malaria in Shandong Province in 2017].

OBJECTIVE: To understand the malaria epidemiological characteristics of Shandong Province in 2017, so as to provide the evidences for formulating targeted prevention and control strategy and measures. METHODS: The data of malaria cases of Shandong Province in 2017 were collected from the Information Management System for Infectious Diseases Report and Information Management System for Parasitic Diseases Control and Prevention. The epidemiological characteristics of malaria situation and the diagnosis and treatment of malaria cases were analyzed. RESULTS: There were 209 malaria cases reported in 2017, all of them were imported cases, and 205 cases (98.09%) were imported from African countries. Among them, 155 cases (74.16%) were falciparum malaria cases. Totally 16 cities had cases reported in 2017, and 154 cases (73.68%) were reported in 6 cities (Yantai, Jining, Weihai, Dezhou, Qingdao, and Tai'an). The malaria cases distributed in 17 cities, and there were 110 cases distributed in 4 cities, namely Yantai, Tai'an, Weihai, and Qingdao, which accounted for 56.41% of the total cases in Shandong Province. Both the median time from onset to seeing a doctor and the median time from seeing a doctor to being diagnosed were one day. Totally 12.92% of the cases went to visit a doctor 7 days later after they had symptoms and 10.53% of the cases were diagnosed 7 days later after the first visit to a doctor. CONCLUSIONS: At present, the prevention and control of the imported malaria is the focus of malaria control in Shandong Province. According to the central tendency of the malaria situation, the health education and propaganda among the high risk groups and the training on the diagnosis and treatment among medical workers should be strengthened, so as to prevent the risk of reappearance of local cases in the past malaria endemic regions, and to ensure the goal of malaria elimination been achieved on schedule.

Effects of Ligustrazine on Airway Inflammation in A Mouse Model of Neutrophilic Asthma / 中国结合医学杂志

<p><b>OBJECTIVE</b>To investigate the effects of ligustrazine (LTZ) on airway inflammation in a mouse model of neutrophilic asthma (NA).</p><p><b>METHODS</b>Forty healthy C57BL/6 female mice were randomly divided into 4 groups using a random number table, including the normal control, NA, LTZ and dexamethasone (DXM) groups, with 10 rats in each group. The NA mice model was established by the method of ovalbumin combined with lipopolysaccharide sensitization. At 0.5 h before each challenge, LTZ and DXM groups were intraperitoneally injected with LTZ (80 mg/kg) or DXM (0.5 mg/kg) for 14 d, respectively, while the other two groups were given the equal volume of normal saline. After last challenge for 24 h, the aerosol inhalation of methacholine was performed and the airway reactivity was measured. The bronchoalveolar lavage fluid (BALF) was collected. The Wright-Giemsa staining was used for total white blood cells and differential counts. The levels of cytokines interleukin (IL)-17 and IL-10 were detected by enzyme-linked immunosorbent assay. The pathological change of lung tissue was observed by hematoxylin eosin staining.</p><p><b>RESULTS</b>The airway responsiveness of the NA group was signifificantly higher than the normal control group (P<0.05), while those in the LTZ and DXM groups were signifificantly lower than the NA group (P<0.05). The neutrophil and eosinophil counts in the LTZ and DXM groups were signifificantly lower than the NA group (P<0.05), and those in the LTZ group were signifificantly lower than the DXM group (P<0.05). There were a large number of peribronchiolar and perivascular inflammatory cells in fifiltration in the NA group. The airway inflflammation in the LTZ and DXM groups were signifificantly alleviated than the NA group. The infifiltration in the LTZ group was signifificantly reduced than the DXM group. Compared with the normal control group, the IL-17 level in BALF was signifificantly increased and the IL-10 level in BALF was signifificantly decreased in the NA group (P<0.05). LTZ and DXM treatment signifificantly decreased IL-17 levels and increased IL-10 levels compared with the NA group (P<0.05), and the changes in the above indices were more signifificant in the LTZ group (P<0.05).</p><p><b>CONCLUSION</b>LTZ could alleviate the airway inflflammation in the NA mice model through increasing the IL-10 level and decreasing the IL-17 level.</p>

Epidemiological analysis of malaria in Shandong Province in 2017 / 中国血吸虫病防治杂志

Objective To understand the malaria epidemiological characteristics of Shandong Province in 2017, so as to provide the evidences for formulating targeted prevention and control strategy and measures. Methods The data of malaria cases of Shandong Province in 2017 were collected from the Information Management System for Infectious Diseases Report and Information Management System for Parasitic Diseases Control and Prevention. The epidemiological characteristics of malaria situation and the diagnosis and treatment of malaria cases were analyzed. Results There were 209 malaria cases reported in 2017, all of them were imported cases, and 205 cases (98.09%) were imported from African countries. Among them, 155 cases (74.16%) were falciparum malaria cases. Totally 16 cities had cases reported in 2017, and 154 cases (73.68%) were reported in 6 cities (Yantai, Jining, Weihai, Dezhou, Qingdao, and Tai’an). The malaria cases distributed in 17 cities, and there were 110 cases distributed in 4 cities, namely Yantai, Tai’an, Weihai, and Qingdao, which accounted for 56.41% of the total cases in Shandong Province. Both the median time from onset to seeing a doctor and the median time from seeing a doctor to being diagnosed were one day. Totally 12.92% of the cases went to visit a doctor 7 days later after they had symptoms and 10.53% of the cases were diagnosed 7 days later after the first visit to a doctor. Conclusions At present, the prevention and control of the imported malaria is the focus of malaria control in Shandong Province. According to the central tendency of the malaria situation, the health education and propaganda among the high risk groups and the training on the diagnosis and treatment among medical workers should be strengthened, so as to prevent the risk of reappearance of local cases in the past malaria endemic regions, and to ensure the goal of malaria elimination been achieved on schedule.

Epidemiological analysis of malaria in Shandong Province in 2017 / 中国血吸虫病防治杂志

Objective To understand the malaria epidemiological characteristics of Shandong Province in 2017, so as to provide the evidences for formulating targeted prevention and control strategy and measures. Methods The data of malaria cases of Shandong Province in 2017 were collected from the Information Management System for Infectious Diseases Report and Information Management System for Parasitic Diseases Control and Prevention. The epidemiological characteristics of malaria situation and the diagnosis and treatment of malaria cases were analyzed. Results There were 209 malaria cases reported in 2017, all of them were imported cases, and 205 cases (98.09%) were imported from African countries. Among them, 155 cases (74.16%) were falciparum malaria cases. Totally 16 cities had cases reported in 2017, and 154 cases (73.68%) were reported in 6 cities (Yantai, Jining, Weihai, Dezhou, Qingdao, and Tai’an). The malaria cases distributed in 17 cities, and there were 110 cases distributed in 4 cities, namely Yantai, Tai’an, Weihai, and Qingdao, which accounted for 56.41% of the total cases in Shandong Province. Both the median time from onset to seeing a doctor and the median time from seeing a doctor to being diagnosed were one day. Totally 12.92% of the cases went to visit a doctor 7 days later after they had symptoms and 10.53% of the cases were diagnosed 7 days later after the first visit to a doctor. Conclusions At present, the prevention and control of the imported malaria is the focus of malaria control in Shandong Province. According to the central tendency of the malaria situation, the health education and propaganda among the high risk groups and the training on the diagnosis and treatment among medical workers should be strengthened, so as to prevent the risk of reappearance of local cases in the past malaria endemic regions, and to ensure the goal of malaria elimination been achieved on schedule.

Effect of group mind-games and group counseling on training burnout among soldiers stationed on plateau for the first time / 军事医学

Objective To explore the effect of group mind-games and group counseling on training burnout among soldiers who quickly marched to the plateau for the first time .Methods Totally 399 soldiers who quickly marched to the plateau for the first time were divided randomly into to the control group ( n=201 ) and test group ( n=198 ) .The test group had particinated in group mind-games and psychological counseling twice a week for a total of 5 weeks, while the control group received no counseling .Soldier training fatigue questionnairs were used to compare the difference between the two groups before and after group mind-games and psychological counseling .Results ①The total scores of training burnout and the scores of all the factors of soldiers before counseling in the two groups was of no statistical significance (P>0.05). After counseling , the total scores of training burnout and the scores of all factors in test group were remarkably lower than those in control group,and the difference was of statistical significance (P<0.05).The total scores of training burnout and the scores of physical and psychologica exhaustion and alienaties decreased significantly after training in test group ( P<0.05), but the change was of no statistical significance in control group (P>0.05).②Soldiers who had served 1 to 2 years or over 9 years had significant difference in the scores of training burnout , physical and psychologica exhaustion ( P<0.05).Soldiers who had served 3 to 8 years had significant difference in the scores of training and the scores of each factor after counseling(P<0.05).Conclusion Group mind-games and psychological counseling can effectively help alleviate the training burnout of soldiers who quickly march to the plateau for the first time.

[Allele genetypes and homology analysis of MSP-1 and CSP gene of Plasmodium vivax in Shandong Province].

OBJECTIVE: To analyze the genotypes and homology of MSP-1 and CSP gene of Plasmodium vivax in Shandong Province, so as to provide the evidence for case traceability. METHODS: A total of 12 blood samples were collected from P. vivax-infected cases in Shandong Province in 2011. Parasite genomic DNA was extracted. Primers were designed according to MSP-1 and CSP gene sequences of P. vivax. Then Nested PCR, enzyme digestion, sequencing and sequence alignment, and homologous analysis were performed. RESULTS: The MSP-1 gene of all the 12 samples from P. vivax-infected cases were detected with a 470 bp PCR amplification band, and 350 bp and 120 bp enzyme digestion fragments, which were identified as type Sal-1. An analysis of phylogenetic tree of MSP-1 gene showed that the sequences of 9 indigenous case samples in Shandong Province were located in the same branch, one case sample infected from India was located in the same branch with India strains. All the 12 P. vivax-infected samples covered GDRA (D/A) GQPA sequences in CSP gene, which were identified as type PV-Ⅰ. Of the CSP gene among 12 P. vivax-infected samples, 10 samples of indigenous case in Shandong Province and one sample of the case infected in Guangdong Province were detected with both 560-840 bp and 150-230 bp PCR amplification bands, which were identified as temperate zone family strain of type PV-Ⅰ. However, one sample from the case infected in India was detected only with a 560-840 bp band, which was identified as tropical zone family strain of PV-Ⅰ. An analysis of phylogenetic tree of CSP gene showed that the sequences of 10 samples from the indigenous cases in Shandong Province and one sample from the case infected in Guangdong Province were located in the same branch, one sample from the case infected in India was located in the same branch with India and Indonesia strains. CONCLUSIONS: Of all the indigenous isolates in Shandong Province, MSP-1 gene is genotyped type Sal-1, CSP gene is genotyped temperate zone family strain of type PV-Ⅰ, with a high homology found among the indigenous isolates.

[Correlation between malaria epidemic incidence and some natural and social factors in high incidence areas of Shandong Province].

OBJECTIVE: To explore the association between malaria epidemic situation and some natural and social factors in high-incidence areas of Shandong Province, so as to provide evidences for malaria elimination in these areas. METHODS: Twenty towns of 10 counties (cities, districts,) in the high incidence areas of malaria in Shandong Province were selected as the study sites, and the residents in the study sites were investigated by questionnaires with one household as a unit, so as to understand the related natural and social factors. In addition, the malaria epidemic data in the study sites from 2006 to 2010 were collected, and the correlation between these factors and the epidemic situation of malaria was analyzed by Spearman rank correlation and multiple stepwise regression. RESULTS: The square root of malaria incidence rate (Y) was negatively related to the rate of households using insecticide (X3), and the rate of households using screen doors and windows (X4) (both P < 0.05), but was positively related to the rate of housing surrounding water environment and exposure ratio (X6) (both P < 0.05). The regression equation established was Y = 0.032X5 + 0.048X6-0.495, R2 = 0.973. CONCLUSIONS: Malaria incidence is obviously associated with some natural and social factors. The measures such as clearing the breeding place of mosquito, protecting the exposure population at nightfall, as well as using door-window screen and repellents correctly, can effectively control malaria.

Characteristics of Imported Malaria and Species of Plasmodium Involved in Shandong Province, China (2012-2014)

Malaria remains a serious public health problem in Shandong Province, China; therefore, it is important to explore the characteristics of the current malaria prevalence situation in the province. In this study, data of malaria cases reported in Shandong during 2012-2014 were analyzed, and Plasmodium species were confirmed by smear microscopy and nested-PCR. A total of 374 malaria cases were reported, 80.8% of which were reported from 6 prefectures. Of all cases, P. falciparum was dominant (81.3%), followed by P. vivax (11.8%); P. ovale and P. malariae together accounted for 6.4% of cases. Notably, for the first time since 2012, no indigenous case had been reported in Shandong Province, a situation that continued through 2014. Total 95.2% of cases were imported from Africa. The ratio of male/female was 92.5:1, and 96.8% of cases occurred in people 20-54 years of age. Farmers or laborers represented 77.5% of cases. No significant trends of monthly pattern were found in the reported cases. All patients were in good condition after treatment, except for 3 who died. These results indicate that imported malaria has increased significantly since 2012 in Shandong Province, especially for P. falciparum, and there is an emergence of species diversity.

Effects of PI3K / Akt signaling pathway on the autophagy of rat alveolar macrophages exposed to dust / 中国职业医学

OBJECTIVE: To determine the regulating role of phosphatidylinositol 3-kinase( PI3K) / protein kinase B( Akt)signaling pathway in the autophagy activity of rat NR8383 cells exposed to silicon dioxide( SiO_2). LY294002 was used to block PI3 K pathway. METHODS: i) The normal NR8383 cells were used and divided into blank group and silica exposure group( final concentrations of SiO_2 suspension were 0 and 50 mg / L respectively). They were cultured for 3,6,12,20 and24 hours. The enzyme linked immunosorbent assay( ELISA) was used to assess the amount of tumor necrosis factor-α( TNF-α) and transforming growth factor-β1( TGF-β1) in supernatants of cultured cells,and then the optimal time of cells exposed to dust was determined. ii) NR8383 cells were divided into control group( treated with a same volume of F-12 K medium without serum),silica group( treated with SiO_2 suspension,final concentration 50 mg / L) and intervention group( treated with SiO_2 suspension and PI3 K inhibitor LY294002,final concentration 50 mg / L and 20 μmol / L,respectively).Cells were harvested following incubation. ELISA was used to detect the levels of TNF-α and TGF-β1 at the time point of20 hours after incubation. To reveal the autophagy status of cells,Western blotting was used to detect Akt and microtubuleassociated proteins 1 light chain 3( LC3) protein at time point of 20 hours; laser scanning confocal microscope( LSCM)was used to observe the immunofluorescence expression of autophagy at time points of 3,6,12 and 20 hours. The cells were also treated with the lysosomal inhibitor chloroquine diphosphate( CDP) at the same time of SiO_2 treatment. RESULTS: i) The time point of 20 hours was confirmed to be the best dust exposure time for in vitro cell model of NR8383 cells.ii) The levels of TNF-α and TGF-β1 of supernatant in the silica group were higher than those of the control group( P <0. 05). The levels of TNF-α and TGF-β1 of supernatant in the intervention group were higher than those of the control group and silica group( P < 0. 05). The Akt protein expression of the intervention group was lower than those in the control group and the silica group,respectively. The LC3 Ⅱ / Ⅰ protein level of the silica group was higher than those of the control group and intervention group( P < 0. 05),but no statistical significance was found between the control group and intervention group( P > 0. 05). LSCM results indicated that autophagy expression at time points of 3 and 6 hours were stronger than those of 12 and 20 hours in control group; autophagy expression at time point of 12 hours was stronger than those of 3 and 6 hours in the silica group,while the autophagy expression at time point of 20 hours was slightly weaker than that of 12 hours,but still stronger than those of 3 and 6 hours. Compared with the same time point in control group,autophagy expression at 3 and 6 hours were weaker in the silica group,while the expressions increased obviously at time points of 12 and 20 hours. Autophagy expression at all time points decreased in the intervention group compared with silica group,especially at the time point of 20 hours. The autophagy expression in each group increased in varying degrees after added with CDP blocking. CONCLUSION: Silica dust exposure can induce autophagy in rat NR8383 cells. PI3 K inhibitor LY294002 can reduce the autophagy expression indicating that the PI3 K / Akt signaling pathway might participate in the autophagy process of silica dust inducing autophagy in alveolar macrophages.

Relationship between high-temperature working classification and hypertension among iron and steel production workers / 中国职业医学

OBJECTIVE: To analyze the relationship between the high-temperature working classification and prevalence of hypertension in iron and steel production workers. METHODS: By a convenience sampling method,2 798 workers in an iron and steel production enterprise were selected as study subjects. They were divided into high-temperature working group( 1 070 cases) and non-high-temperature working( control) group( 1 728 cases). The occupational health status was investigated by questionnaire survey and the blood pressure was measured. The wet bulb globe temperature in workplace of high temperature working group was measured,and the high-temperature classification was made based on the time of exposure to high temperature. RESULTS: The prevalence rate of hypertension of 2 798 iron and steel production workers was32. 8%. The prevalence rate of hypertension of high-temperature working group was higher than that of the control group( 41. 3% vs 27. 5%,P < 0. 01). The prevalence rate of hypertension in high temperature working group presented an increasing tendency with the increase of high-temperature working level( P < 0. 01). The multiple logistic regression analysis results showed that excluding the confounding factors of age,body mass index,family history of hypertension,educational background,smoking,alcohol drinking,salt intake and mental stress,it showed that high-temperature working classification was positively correlated with increasing prevalence of hypertension in high-temperature working group( P <0. 01); and the initial exposure age to high-temperature was negatively correlated with the prevalence of hypertension in iron and steel production workers( P < 0. 01). CONCLUSION: High-temperature is an important influence factor to the prevalence of hypertension in iron and steel production workers. Strengthening the management of high-temperature classification is helpful for the prevention and treatment control of hypertension in the iron and steel production workers

Relationship between cumulative noise exposure and hypertension among iron and steel production workers / 中国职业医学

OBJECTIVE: To analyze the relationship between the cumulative noise exposure( CNE) and prevalence of hypertension in iron and steel production workers. METHODS: By convenience sampling method,2 253 workers,whose workplace in an iron and steel enterprise with wet bulb globe temperature index less than 25. 0 ℃,were selected as study subjects. The blood pressure and workplace noise exposure level were measured. According to the equal energy principle,the normalized continuous A-weighted sound pressure level equivalent to an 8 h-working-day and workers' length of service were used to calculate the CNE level. The workers with CNE≥75 d B( A) ·year were regarded as the exposure group,and those with CNE < 75 d B( A) ·year were deemed as the control group. RESULTS: The prevalence rate of hypertension in the exposure group was higher than that of the control group( 32. 3% vs 21. 5%,P < 0. 01). With the increased CNE level,the prevalence rate of hypertension increased( P < 0. 01). The multiple logistic regression analysis results showed that the prevalence risk of hypertension disputed an upward trend of the dose-response relationship following the increasing CNE among the iron and steel production workers( P < 0. 01) after controlling the confounding factors of age,body mass index,educational background,family history of hypertension,smoking,alcohol drinking,salt intake,fried barbecue food intake and so on. CONCLUSION: CNE is a vital factor which influences hypertension prevalence in iron and steel production workers. Strengthen the noise protection is helpful for the prevention and treatment of hypertension in the steel workers.