Analysis of the effect of hand-transmitted vibration on hearing loss in male noise-exposed workers / 中国职业医学

Objective To investigate the combined effect of noise and hand-transmitted vibration on hearing loss in male noise-exposed workers. Methods A total of 952 male noise-exposed workers from an automobile manufacturing enterprise were selected as the research subjects using judgment sampling method. Occupational epidemiological surveys, assessments of occupational hazards in workplace, and pure-tone audiometry tests were conducted on the research subjects, and they were divided into low-level noise group, low-level combined group, high-level noise group, and high-level combined group according to whether the noise exposure level exceeded the national standard and whether they were jointly exposed to hand-transmitted vibration. The joint effects of noise and hand-transmitted vibration on hearing loss were analyzed. Results The detection rate of hearing loss in 952 noise-exposed workers was 21.7%. The detection rate of hearing loss of four groups, from high to low, was as follows： high-level combined group, high-level noise group, low-level combined group, and low-level noise group (44.9% vs 32.7% vs 12.9% vs 5.7%, P<0.01). The results of multivariate logistic regression analysis showed that the risk of hearing loss in the low-level noise group, the low-level combined group, the high-level noise group and the high-level combined group increased sequentially after adjusting for the confounding factors such as age, education level, smoking, drinking, listening to music with headphones, frequency of wearing noise-blocking earplugs and body mass index. The risk of hearing loss in the high-level noise group was 8.62 times more than that of the low-level noise group (P<0.01). The risk of hearing loss in the low-level noise combined group was 2.50 times more than that of the low-level noise group (P<0.01). The risks of hearing loss in the high-level combined group were 5.76 and 1.67 times more than that of the low-level combined group and the high-level noise group. Conclusion Combined exposure to noise and hand-transmitted vibration can increase the risk of hearing loss in male noise-exposed workers, and the higher the noise intensity, the greater the synergistic effect. Hand-transmitted vibration is a synergistic risk factor for occupational noise-induced hearing loss.

The association between sleep duration, obesity types and the risk of chronic diseases among occupational population in Shanghai City / 中国职业医学

Objective To investigate the relationship between sleep duration and obesity, and the risk of common chronic diseases in the occupational population in Shanghai City. Methods A total of 18 775 occupational individuals were selected as the study subjects using convenience sampling method in Shanghai City. Data on personal lifestyle behaviors and medical examination results were collected. The relationship between sleep duration and different types of obesity with dyslipidemia, hyperuricemia, hypertension, and hyperglycemia was analyzed. Results The incidence of dyslipidemia, hyperuricemia, hypertension, and hyperglycemia among the study subjects was 24.9%, 16.2%, 11.5%, and 7.3%, respectively. The incidence of these four chronic diseases were higher in individuals with central obesity and suboptimal sleep compared to the control group (all P<0.01). Multivariate logistic regression analysis showed that suboptimal sleep combined with general obesity/overweight increased the risk of dyslipidemia, hyperuricemia, hypertension, and hyperglycemia in the study subjects ［odds ratio (OR) were 2.40, 3.47, 3.30, and 2.79, respectively; all P<0.01］, after adjusting for age, gender, education level, marital status, occupation type, labor intensity, smoking, and drinking. Suboptimal sleep combined with central obesity also potentially increased the risk of these four chronic diseases (OR were 2.25, 3.09, 3.09, and 2.98, respectively; all P<0.01). Conclusion The incidence of common chronic diseases is relatively high in the occupational population in Shanghai City. Suboptimal sleep combined with different types of obesity increases the risk of common chronic diseases.

The expression of adhesion molecules in Z310 cells induced by combined exposure to black carbon and lead / 中国职业医学

Objective: To investigate the effects of combined exposure to black carbon and lead on the expression of cell adhesion molecules and their regulating microRNAs (miRNAs) in the rat choroid plexus epithelial Z310 cells. Methods: i) Z310 cells were randomly divided into control group, black carbon exposure group, lead exposure group and combined exposure group. The lead exposure group and black carbon exposure group were treated with 10 μmol/L lead acetate and 10 mg/L black carbon, respectively, and the combined exposure group was treated with both in the above doses. After 12.0 hours, the expressions of intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1), and mucosal vascular addressin cell adhesion molecule-1 (MAdCAM-1) in Z310 cells was detected by Western blotting. The expression of miR-326, miR-328-3p and miR-542-3p which regulated ICAM-1 was detected by real-time fluorescent quantitative polymerase chain reaction. ii) Z310 cells or Z310 cells transfected with miRNA-326 mimic were randomly divided into control group, miRNA-326 transfection control group, combined exposure group and miRNA-326 transfection combined exposure group. Cells in the two control groups were not treated. The two combined exposure groups were treated with 10 mg/L black carbon and 10 μmol/L lead acetate for 12.0 hours. The expression of ICAM-1 was detected by Western blotting. Results: i) The relative expression of ICAM-1, VCAM-1 and MAdCAM-1 in the cells of black carbon exposure group and ICAM-1 in the lead exposure group was higher than those in the control group (all P<0.05). The relative expression of ICAM-1 and MAdCAM-1 in the combined exposure group was higher than those in the other three groups (all P<0.05). The relative expression of VCAM-1 in cells of combined exposure group was higher than those in the control group and lead exposed group (all P<0.05). The relative expression of miR-326 in cells of the lead exposure group and black carbon exposure group was lower than those in the control group (all P<0.05). The relative expression of miR-326 in the combined exposure group was lower than that in the other three groups (all P<0.05). There was no significant difference between miR-328-3p and miR-542-3p in the four groups (all P>0.05). ii) The relative expression of ICAM-1 in cells of the miR-326 transfection control group cells was lower than that in the control group (P<0.05), while in the cells in the combined exposure and miRNA-326 transfection combined exposure group, it was higher than that in the control and miRNA-326 transfection control groups (all P<0.05), and lower in the miRNA-326 transfection combined exposure group than in the combined exposure group (P<0.05). Conclusion: Black carbon or lead exposure can upregulate the expression of ICAM-1, VCAM-1 and MAdCAM-1 in Z310 cells. Black carbon and lead combined exposure lead to a synergistic effect on upregulation of ICAM-1 and MAdCAM-1 expression, particularly ICAM-1. The combined exposure of black carbon and lead may upregulate the expression of ICAM-1 by downregulating the expression of miR-326.

Regulation of Nrf2 signaling factor in cadmium combined with bacitracin induced endoplasmic reticulum stress in testes and ovaries of rats / 中国职业医学

@#Objective To investigate the effect of acute exposure to cadmium combined with bacitracin on the endoplasmic reticulum stress (ERS) in testes and ovaries of rats and its regulation by nuclear factor erythroid-2-related factor 2 (Nrf2). Methods According to the 4×2 factorial design model, 48 specific pathogen free adult SD rats were divided into four groups: the control group and the low-, medium- and high- dose cadmium chloride exposure groups. Each group was further divided into with- or without bacitracin combined subgroup. There were six rats in each subgroup with 3 males and 3 females. The low-, medium- and high- dose groups were intraperitoneally injected with 5, 10, 20 mg/kg body weight of cadmium chloride solution, respectively. The control group was intraperitoneally injected with the same amount of 0.9% sodium chloride solution. Among them, rats in the bacitracin combined subgroup were given a one-time intraperitoneal injection of bacitracin at a dose of 20 mg/kg body weight two hours before cadmium chloride exposure. After 48 hours, the rats were sacrificed. The mRNA expression of glucose regulated protein78 kD (Grp78), protein kinase R-like endoplasmic reticulum kinase (Perk), Nrf2 in testes and ovaries of rats was determined using quantitative real-time polymerase chain reaction. The protein expression of GRP78, PERK, NRF2 was determined using Western blotting. Results The mRNA expression of Grp78, Perk, Nrf2 and the protein expression of GRP78, PERK, NRF2 in testes and ovaries of rats in the no bacitracin combined subgroups of the three dose groups showed different degrees of up-regulated changes compared with the no bacitracin combined subgroup of the control group (all P<0.05). Among them, the expression of the three kinds of mRNAs and proteins in the testes and ovaries of rats in the no bacitracin combined subgroups of the high-dose group was up-regulated (all P<0.05), and most of them were higher than those in the no bacitracin combined subgroups of the low- and medium-dose groups (all P<0.05). The expression of most of the three kinds of mRNAs and proteins in testes of rats showed different degrees of down-regulated changes (all P<0.05), but the expression of the three kinds of mRNAs and proteins showed different degrees of up-regulated changes in ovaries (all P<0.05) in the bacitracin combined subgroups of the three doses groups than that in the bacitracin combined subgroups of the control group, and especially in the bacitracin combined subgroups of the high-dose subgroup. The expression of the three kinds of mRNAs and proteins in testes and ovaries of rats in the bacitracin combined subgroups of the three doses groups showed different degrees of changes (all P<0.05) compared with the no bacitracin combined subgroup in the same group, and the expression in the bacitracin combined subgroups of the medium- and high-dose groups showed mainly down-regulated changes (all P<0.05). Conclusion Acute exposure to cadmium can induce different degrees of ERS, activate PERK/NRF2 signaling pathway, and improve the toxicity to testis and ovary. Bacitracin can inhibit cadmium-induced ERS, thereby inhibiting the activation of PERK/NRF2 signaling pathway, and enhancing the synergistic effect of cadmium on testis and ovary toxicity. The higher the exposure dose of cadmium, the more obvious the inhibitory effect.

Combined Effect of Smoking and Obesity on Coronary Heart Disease Mortality in Male Veterans: A 30-year Cohort Study / 生物医学与环境科学（英文）

Objective@#Evidence is lacking regarding the combined effects of smoking and obesity on mortality from coronary heart disease in male veterans. This study aimed to explore the combined effect of smoking and obesity on coronary heart disease mortality in male veterans in China.@*Methods@#A cohort of 1,268 male veterans from 22 veteran centers in Xi'an (Shaanxi Province, China) were followed up once every 2 years from February 1, 1987 to October 30, 2016. The endpoint was death from any cause. The hazard ratio ( @*Results@#The total follow-up was 24394.21 person-years; each subject was followed up for a mean duration of 19.24 years. By the end of the study, of the 1,268 veterans, 889 had died, 363 were alive, and 16 were lost to follow-up. Cox regression analysis results revealed that current smoking ( @*Conclusion@#Our results suggest that obese veterans who smoke might be an important target population for coronary heart disease mortality control.

The regulation role of PDK/Akt signaling pathway in berberine combined with ginsenoside Rg3 induced apoptosis of nasopharyngeal carcinoma cells / 中国药理学通报

Aim To study the effect of berberine combined with ginsenoside Rg3 on the apoptosis of nasopharyngeal carcinoma ( NPC ) cells, and to discuss the role of the PDK/Akt signaling pathway in this process. Methods Real time cellular analysis (RTCA)_fluorescence double-staining flow cytometry and Hoechst 33342 staining were used to detect the effects of ber¬ berine combined with ginsenoside Rg3 on the proliferation and apoptosis of NPC cells. Western blot was used to examine the effects of drugs on the expressions of apoptosis-related proteins and the key proteins of PI3K/Akt signaling pathway. Results Berberine combined with ginsenoside Rg3 inhibited the proliferation and induced cell apoptosis of NPC cells. Expressions of PI3K p 11 0 α and p-Akt were significantly down-regulated in combined drug group. After activation of PI3K/Akt signaling pathway, the effect of berberine combined with ginsenoside Rg3 on inhibiting CNE2 cell proliferation and inducing apoptosis was reduced. Compared with combination group, the levels of Survivin, PCNA and Bcl-2 were relatively enhanced, while the level of Bax declined (P < 0. 05). Conclusions Berberine combined with ginsenoside Rg3 may play a role in inhibiting the proliferation and inducing apoptosis of NPC cells through PI3K/Akt signaling pathway.

Effects and mechanism of combined exposure of di(2-ethylhexyl) phthalate and bisphenol A on glucose metabolism in female rats during gestational and lactational period / 中国职业医学

OBJECTIVE: To investigate the effects of combined exposure to di(2-ethylhexyl) phthalate(DEHP) and bisphenol A(BPA) on glucose metabolism in female rats during gestational and lactation periods, and its possible mechanism. METHODS: Twenty-four specific pathogen free pregnant SD rats were randomly divided into control group, DEHP group, BPA group, and combined exposure group, with 6 rats in each group. From the 5 th day of gestation to the 21 st day after birth of the offspring, the rats in the DEHP group were treated with DEHP 600 mg/kg body weight(bw); rats in BPA group were treated with 80 mg/kg bw BPA, and rats in combined exposure group were treated with 600 mg/kg bw DEHP and 80 mg/kg bw BPA by intragastric perfusion, while the rats in the control group were given the same amount of corn oil, once per day. After exposure, maternal rats were sacrificed immediately. The levels of glucose metabolism related indicators in liver tissues and serum were examined, and the mRNA and protein expression of phosphatidylinositol 3-kinase(PI3 K)/protein kinase B(AKT) signaling pathway related factors in liver tissues were detected by real-time fluorescence quantitative polymerase chain reaction and Western blot. RESULTS: Except for the activity of phosphoenolpyruvate carboxykinase(PEPCK) in BPA group, the levels of liver glycogen and serum high density lipoprotein cholesterol(HDL-C) in rats of the 3 exposure groups decreased(P<0.05), while the activity of serum PEPCK and the level of low density lipoprotein cholesterol(LDL-C) increased(P<0.05) compared with rats in the control group. The levels of liver glycogen and serum HDL-C in the combined exposure group were lower than that in the BPA group(P<0.05), while the level of serum LDL-C were lower than that in DEHP group and BPA group(P<0.05). The levels of serum glycosylated serum protein, total cholesterol and triglyceride in the 4 groups were not statistically different when compared with each other(P>0.05). Except for the PI3 K protein in DEHP group, the mRNA and protein expression of PI3 K, AKT, and glucose transporter 4 in liver tissues of rats in the 3 exposure groups decreased(P<0.05), and the mRNA expression of forkhead box protein 1(Foxo1) decreased(P<0.05), but the protein expression of FOXO1 increased(P<0.05) compared with the control group. CONCLUSION: Exposure to DEHP or BPA during pregnancy and lactation can cause glucose metabolism disorders in rats. The combined exposure of DEHP and BPA has certain synergistic effect. This process may be achieved through the PI3 K/AKT signaling pathway.

Combined effect of noise and other occupational hazards on hearing impairment and electrocardiograph / 中国职业医学

OBJECTIVE: To explore the combined effect of noise and other occupational hazards on hearing impairment and electrocardiograph(ECG) of workers in automobile manufacturing enterprises. METHODS: A judgment sampling method was used to select 3 434 workers as study subjects from an automobile manufacture enterprise. According to the exposure to different types of occupational hazardous factors, they were divided into noise series group, noise dust group, noise welding dust group, noise benzene series group, noise nitrogen oxide group and control group, with 716, 693, 1 540, 45, 195 and 245 cases in each group, respectively. The subjects were examined with pure-tone hearing test and ECG. RESULTS: The total rate of high frequency hearing loss was 11.2%(385/3 434), and high frequency hearing loss was the main type of hearing loss among workers in each group. The simple high-frequency hearing loss rates of noise group, noise dust group, noise welding dust group, noise benzene series group, noise nitrogen oxide group and the control group were 10.3%, 11.5%, 12.3%, 26.7%, 10.3% and 4.1% respectively, and the rate of total hearing loss were 13.7%, 14.6%, 14.6%, 31.1%, 16.9% and 6.5% respectively. Compared with the control group, the rate of simple high-frequency hearing loss and total hearing loss were higher in the other 5 groups(P<0.005). The rate of high-frequency hearing loss in noise group was lower than that in noise benzene series group(P<0.005). The rate of arrhythmia was 20.9%(717/3 434). Arrhythmia was the main type of ECG abnormality in all groups. The rates of arrhythmia in noise group, noise dust group, noise welding dust group, noise benzene series group, noise nitrogen oxide group and control group were 16.9%, 16.6%, 27.9%, 17.8%, 13.8% and 6.9%, respectively. The rate of arrhythmia in noise welding dust group was higher than that in noise group(P<0.005). CONCLUSION: The combined effect of noise and benzene series increases the risk of high-frequency hearing loss in workers. The combined effect of noise and welding dust increases the risk of arrhythmia in workers.

Combined effect of noise and hydrogen cyanide on noise-induced hearing loss in a metal electroplating enterprise / 中国职业医学

OBJECTIVE: To study the combined effect of noise and hydrogen cyanide on noise-induced hearing loss( NIHL)in a metal electroplating enterprise. METHODS: The judgment sampling method was used to select 663 workers in a largescale metal electroplating enterprise as the study subjects. Among them,186 workers exposed to noise alone were designated as noise group; 138 workers exposed to hydrogen cyanide alone were designated as hydrogen cyanide group; and161 workers exposed to noise and hydrogen cyanide were designated as combined effect group,and 178 workers without exposure from occupational disease risk factors were designated as control group. Questionnaires survey and pure tone audiometry were used for analyzing the effects of combined noise and hydrogen cyanide exposure on NIHL. RESULTS: The hearing loss detection rate of the study subjects was 40. 4%. The hearing loss detection rates in the control group,noise group,hydrogen cyanide group,and combined effect group were 17. 4%,47. 8%,32. 6% and 64. 0%,respectively. The detection rate of hearing loss in the control group was lower than that in the other three groups( P < 0. 008). The NIHL detection rates in the combined effect group and the noise group were higher than that in the hydrogen cyanide group( P <0. 008). The hearing loss detection rate of the combined effect group was higher than that of the noise group and the hydrogen cyanide group( P < 0. 008). Ordinal multi-categorical logistic regression model results showed that after adjusting confounding factors such as age,length of service,gender,marital status,smoking,alcohol drinking,we found hydrogen cyanide exposure,noise exposure,and combined exposure to hydrogen cyanide and noise had effects on workers' hearing(P < 0. 05). The risk of hearing loss in workers exposed to noise and hydrogen cyanide was higher than that of workers exposed to noise alone or hydrogen cyanide alone. CONCLUSION: There is a combined effect of noise and hydrogen cyanide in this metal electroplating enterprise,which can increase the risk of NIHL in workers.

Effect of baicalin Combined with phillyrin on the gene expression of influenza A virus nucleoprotein / 医学研究生学报

Objective Influenza A (InfA) is an acute respiratory infectious disease persistently threatening human health and social stability. The high mutation of the InfA virus makes very significant the development of anti-influenza drugs. Traditional Chinese herbal drugs have shown distinct advantages in the prevention and management of InfA. This study aimed to investigate the effect of baicalin combined with phillyrin on the gene expression of InfA virus nucleoprotein (NP).Methods The nucleoprotein eukaryotic expression vector of InfA virus was constructed by transient transfection of InfA virus NP eukaryotic recombinant plasmid pcDNA3.1 (+)/NP into hela cells. Six groups were designed for the experiment: hela cells, liposome, recombinant plasmid (transfected pcDNA3.1(+)/NP), baicalin, phillyrin, baicalin (15.625 μg/mL-1) + phillyrin (12.5 μg/mL-1), each treated with respective agents after transfection. After 48 hours of culture, the number of the copied InfA virus NPs in the hela cells was measured by RT-qPCR and the effect of baicalin combined with phillyrin on the gene expression of InfA virus NP in the target cells evaluated by the statistical method.Results RT-qPCR showed that the gene expression of InfA virus NP was significantly lower in the baicalin + phillyrin than in the recombinant plasmid group (t=6.966, P1) and a synergistic effect of medium- and high-dose baicalin + medium- and high-dose phillyrin (CI<1).Conclusion Baicalin combined with phillyrin can decrease the gene expression of InfA virus NP and has a synergistic effect within a certain dose range.

Galla chinensis extracts and calcium induce remineralization and antibacterial effects of enamel in a Streptococcus mutans biofilm model / 대한구강보건학회지

OBJECTIVES: The purpose of this study was to investigate the combined effects of Galla chinensis extract (GCE) and calcium (CA) on enamel remineralization. The antibacterial effect of G. chinensis on Streptococcus mutans biofilm was also evaluated by examining the bacterial growth, acidogenesis, and morphology of the biofilm in vitro. METHODS: S. mutans biofilm was formed on bovine enamel specimens over a 72-h period and treated for 10 min with 1.0 mol CA, 4,000 ppm aqueous solution of GCE, or a combination of the two (GCE+CA). The enamel specimens were analyzed for enamel surface microhardness after remineralization. We tested the anti-cariogenic effects of GCE based on the inhibition of acid production, antibacterial activity, and morphological changes in S. mutans. The differences between the groups and antibacterial effects were analyzed using one-way analysis of variance. RESULTS: GCE+CA group showed the highest efficacy in enhancing remineralization. The GCE group showed the highest antibacterial activity against S. mutans biofilm. Although the GCE+CA group showed significant antibacterial activity, it was less than that of the GCE group (P < 0.05). Both GCE and GCE+CA groups maintained a pH of approximately 7.0 for 1 h whereas the pH of the control group decreased rapidly from pH 7.3 to pH 6.1. SEM imaging revealed that S. mutans treated with GCE and GCE+CA showed irregular cell wall structure and showed fewer cells in the chain than the typical long chains observed in the control group. CONCLUSIONS: This study found that natural G. chinensis significantly enhances enamel remineralization, and exerts synergistic effects with calcium. It also exerts strong bactericidal activity and inhibits acid production and changes in the microstructure of S. mutans biofilm.

Impact of sodium butyrate and mild hypothermia on metabolic and physiological behaviour of CHO TF 70R cells

Background: To reduce costs associated with productivity of recombinant proteins in the biopharmaceutical industry, research has been focused on regulatory principals of growth and survival during the production phases of the cell culture. The main strategies involve the regulation of cell proliferation by the modulation of cell cycle control points (G1/S or G2/M) with mild hypothermia and the addition of sodium butyrate (NaBu). In this study, batch culture strategies were evaluated using CHO TF 70R cells producing the recombinant human tissue plasminogen activator (rh-tPA), to observe their individual and combined effect on the cellular physiological state and relevant kinetic parameters. Results: NaBu addition has a negative effect on the mitochondrial membrane potential (ΔΨm), the values of which are remarkably diminished in cultures exposed to this cytotoxic compound. This effect was not reflected in a loss of cell viability. NaBu and mild hypothermic conditions increased the doubling time in the cell cultures, suggesting that these strategies triggered a general slowing of each cell cycle phase in a different way. Finally, the individual and combined effect of NaBu and mild hypothermia produced an increase in the specific rh-tPA productivity in comparison to the control at 37°C without NaBu. Nevertheless, both strategies did not have a synergistic effect on the specific productivity. Conclusions: The combination of NaBu addition and mild hypothermic condition causes an impact on physiological and metabolic state of CHO TF 70R cells, decreasing cell growth rate and improving glucose consumption efficiency. These results therefore provide a promising strategy to increase specific productivity of rh-tPA.

Combined effects of fluoride and arsenic exposure on proliferation, differentiation and beta-catenin expression in rat osteoblasts / 中华地方病学杂志

Objective To investigate the combined effects of fluoride (NaF) and arsenate (NaAsO2) exposure on proliferation,differentiation and bata-catenin expression in SD rat osteoblasts.Methods Osteoblasts were isolated from calvarias of twelve SD rats born in 1-3 days and cultured.The method was divided into 9 groups [F0.0As0.0 (control group),F0.5As0.0,F4.0As0.0,F0.0As0.1,F0.0As10.0,F0.5As0.1,F0.5As10.0,F4.0As0.1,F4.0As10.0] by factorial experiment design (3 factors and 2 levels).Osteoblasts were exposed to NaF (F-:0.0,0.5,4.0 mmol/L,F0.0,F0.5,F4.0),NaAsO2 (As3+:0.0,0.1,10.0 μmol/L,As0.0,As0.1,Asi10.0) and cultured for 72 hours.The proliferation and alkaline phosphatase (ALP) was determined by 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyl (MTT) and Enzyme-linked immunosorbent assay (ELISA).The expression of beta-catenin was analyzed by quantitative real-time PCR (qPCR) and Western blotting after 72 hours of experiment.Results ①There was significant difference in cell proliferation and the activity of ALP among groups after 72 hours (F =14.022,14.425,all P ＜ 0.05).Compared with control group,the proliferation and the activity of ALP were significantly induced in F0.5 treated osteoblasts groups (0.313 ±0.023 vs0.455 ± 0.152,4.46 ± 0.72 vs 6.09 ± 0.68,all P ＜ 0.05),and the proliferation was significantly suppressed in F4.0As0.0 group (0.029 ± 0.014,P ＜ 0.05),the activity of ALP was significantly induced in F0.0As10.0 group (0.156 ± 0.010,6.29 ± 0.67) and the proliferation was significantly suppressed in F0.0As0.1 group (0.370 ± 0.029,3.68 ± 0.45,all P ＜ 0.05).②There was statistical difference in beta-catenin mRNA and protein expressions among groups with F-(F =7.782,559.455,all P ＜ 0.05) at As0.0 condition.There was significant difference in the expression of betacatenin mRNA and beta-catenin protein in F0.5As0.0 group compared with control group (1.00 ± 0.32 vs 1.99 ± 0.14,3.56 ± 0.15 vs 5.11 ± 0.26,all P ＜ 0.05),the beta-catenin protein was significantly suppressed in F4.0As0.0 group (1.10 ± 0.02,P ＜ 0.05).There was significant difference in the expression of beta-catenin protein of all groups with As3+ (F =154.736,P ＜ 0.05) at F0.0 condition.③Factorial analysis showed that fluoride or arsenic alone could affect the proliferation and the expression level of beta-catenin mRNA and protein (F =82.081,11.991,514.741;19.302,8.753,523.698,all P ＜ 0.05),the effect of arsenic on ALP activity of osteoblasts was also the main effect (F =17.444,P ＜ 0.05);and there was an interaction between fluoride or arsenic to cell proliferation and the activity of ALP and the expression of beta-catenin mRNA and protein (F =13.085,18.157,4.936,426.036,all P ＜ 0.05).Conclusions A biphasic pattern of fluoride or arsenic on proliferation and differentiation has been induced in SD rat osteoblasts.Fluoride or arsenic can affect bone metabolic by beta-catenin.

Combination of Origanum vulgare L. essential oil and lactic acid to inhibit Staphylococcus aureus in meat broth and meat model

This study assessed the occurrence of an enhancing inhibitory effect of the combined application of Origanum vulgare L. essential oil and lactic acid against Staphylococcus aureus by the determination of Fractional Inhibitory Concentration (FIC) index and cell viability in meat broth and meat model. Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) of the oil was 0.6 and 1.25 µL.mL-1, respectively. Lactic acid showed MIC and MBC of 2.5 and 5µL.mL-1, respectively. FIC indices of the combined application of the oil and lactic acid were 0.5 showing a synergic interaction. The essential oil and lactic acid showed similar (p>0.05) anti-S. aureus effect in meat broth over 96 h of exposure. Treatment with essential oil or lactic acid presented a smaller anti-staphylococcal effect in meat in comparison to meat broth. No significant difference (p>0.05) was found for the microbial counts in meat treated with each antimicrobial alone or in mixture. These results could arise as an interesting approach for the improvement of food preservation using more natural procedures, considering the current demand of consumer and sensory quality of foods.

Antitumor Effects of Camptothecin Combined with Conventional Anticancer Drugs on the Cervical and Uterine Squamous Cell Carcinoma Cell Line SiHa

Functional defects in mitochondria are involved in the induction of cell death in cancer cells. We assessed the toxic effect of camptothecin against the human cervical and uterine tumor cell line SiHa with respect to the mitochondria-mediated cell death process, and examined the combined effect of camptothecin and anticancer drugs. Camptothecin caused apoptosis in SiHa cells by inducing mitochondrial membrane permeability changes that lead to the loss of mitochondrial membrane potential, decreased Bcl-2 levels, cytochrome c release, caspase-3 activation, formation of reactive oxygen species and depletion of GSH. Combination of camptothecin with other anticancer drugs (carboplatin, paclitaxel, doxorubicin and mitomycin c) or signaling inhibitors (farnesyltransferase inhibitor and ERK inhibitor) did not enhance the camptothecin-induced cell death and caspase-3 activation. These results suggest that camptothecin may cause cell death in SiHa cells by inducing changes in mitochondrial membrane permeability, which leads to cytochrome c release and activation of caspase-3. This effect is also associated with increased formation of reactive oxygen species and depletion of GSH. Combination with other anticancer drugs (or signaling inhibitors) does not appear to increase the anti-tumor effect of camptothecin against SiHa cells, but rather may reduce it. Combination of camptothecin with other anticancer drugs does not seem to provide a benefit in the treatment of cervical and uterine cancer compared with camptothecin monotherapy.

Combined Effects of p,p'-DDE and ?-BHC on Lipid Peroxidation in Rat Sertoli Cells in vitro / 环境与健康杂志

Objective To study the combined effects of p,p'-DDE and ?-BHC on lipid peroxidation in the rat Sertoli cells in vitro. Methods After separated Sertoli cells from testicular tissue of rats and treated with the toxicants at different doses, p,p'-DDE(10, 30, 50 ?mol/L), ?-BHC(10, 30, 50 ?mol/L) and p,p'-DDE+?-BHC(10+10, 30+30, 50+50 ?mol/L) which were decided by MTT method, the leakage of LDH, the activity of SOD and the contents of MDA in Sertoli cells were determined. Results The absorbance values of 50 ?mol/L p,p'-DDE and ?-BHC were significantly decreased (P

Effects of Airway Inflammation Induced by Low Level Ozone and Nitrogen Dioxide Exposure in Independent and Combined in Mice / 环境与健康杂志

Objective To investigate the effects of single and combined exposure to ozone and nitrogen dioxide on airway injury and inflammatory levels in mice. Methods Eighty BALB/C mice were randomly divided into eight groups:four were sensitized model groups(the control group,the O3 group,the NO2 group and the O3+NO2 group based on the way of exposure) ,the other four were non-sensitized groups. The concentration of O3 was 0.16 mg/m3,NO2 was 0.30 mg/m3. Mice were exposed 2 hours every day for 7 consecutive days. Mice were sacrificed in the exposure end and cell counting and cytokine measurement from bronchoalveolar lavage fluid(BALF) were performed. Results In the sensitized groups,neutrophil proportion and IL-6 were significantly increased except the control group and IL-2 and MDA were also significantly increased in the O3 group and the O3+NO2 group(P

Cytotoxic Effect of X-irradiation of Mouse Tumor Cells in the Presence of Korean Ginseng Extract / 대한방사선종양학회지

PURPOSE: We already reported the results that aqueous extract of Korean ginseng roots showed a marked cytotoxicity. In this study, we investigated whether combined ginseng product with X-irradiation increase the cytotoxicity of tumor cells than X-irradiation or not. MATERIALS AND METHODS: Fifty gram of Korean ginseng powder mixed with 1 L of distilled water was extracted with reflux flask under condition of 100 degrees C for 5 hrs. This aquaous ginseng extract was filtered, centrifuged and then was freezed under condition of -90degrees C for 16-18 hrs. The freezing extract was dried with freeze drier, and then diluted. X-irradiation was given to tumor cells by 6 MeV linear accelerator. The cytotoxicity of ginseng in vitro was evaluated from its ability to reduce the clonogenecity of fibrosarcoma (FSa II) cells. In X-irradiation alone group, each 2, 4, 6 and 8 Gy was given to tumor cells. In X-irradiation with ginseng group, 0.2 mg/mL of ginseng extract was exposed to tumor cells for 1 hour before X-irradiation. RESULTS: The yield for 50 g of ginseng extract which was treated with freezing drier was 3.13 g (6.3%). Cytotoxicity in vitro was measured as survival fraction which was judged from the curve, at ginseng concentration of 0.001, 0.01, 0.1 and 1 mg/mL were 0.89+/-0.04, 0.86+/-0.06, 0.73+/-0.01 and 0.09+/-0.02, respectively. Survival fraction at X-irradiation alone of 2, 4, 6 and 8 Gy were 0.81+/-0.07, 0.42+/-0.08, 0.15+/-0.02, 0.03+/-0.01, respectively. But, survival fraction in combined group of X-irradiation and ginseng (0.2mg/mL) at each same radiation dose were 0.28+/-0.01, 0.18+/-0.03, 0.08+/-0.02, 0.006+/-0.002, respectively ( p<0.05). CONCLUSION: The yield for ginseng extract which was treated with freezing drier was 6.3%. Cytotoxicity of Fsa II in combined ginseng with X-irradiation group was increased than that of X-irradition alone group, and its enhancing effect seemed to be added.

Subchronic Toxic Effects of Exposure in Combination to Dibutyl Phthalate and Benzo[a]pyrene on Spermatogenesis in Male Rats / 环境与健康杂志

Objective To explore the combined effects of subchronic exposure of dibutyl phthalate (DBP) and benzo [a] pyrene (B[a]P) on spermatogenesis in male rats. Methods A total of 32 male Sprague-Dawley rats aged 4-5 weeks were randomly divided into 4 groups and treated respectively as follows, corn oil, 1 mg/kg of B[a]P, 50 mg/kg of DBP, 1 mg/kg of B[a]P+50 mg/kg of DBP , the gavage was used every other day, for 90 days. The rats were sacrificed and the testes, epididymis, livers and other visceral organs were collected, and the organ coefficients were calculated. Flow cytometry (FCM) was used to detect changes of cell cycle. The testes were prepared for histological examination, and cauda epididymides were isolated for the determination of progressive motility and density of stored spermatozoa. The blood samples were collected to assess the effect of B[a]P and DBP on plasma testosterone and luteinizing hormone (LH) concentrations with chemiluminescence immumo-assay. Results The percentage of progressively motile stored spermatozoa and stored sperm density were not changed when exposure to B[a]P and DBP. The exposure alone and combined to B[a]P and DBP caused a reduction in mean tubular area compared with the control (P

Effect of Early Stage Shock in Combined Radiation—Burn on Whole Body and Intestinal Epithelium of Mice / 中华创伤杂志

Compared study of the early shock stage effects on whole body and intestinal epithelium was taken among radiation injury (12.16Gy irradiation of a ~(60)Co source), burns (5%, 10%, 15%, 25%TBSA Ⅲ?) and combined radiation-burn injury animals. Seven hundred and fifty mice were examined totally. The incidence of severe shock increased as the extent of burn area increased. The early burn shock was the most important cause of death in combined injury animals before 48h postinjury, and represented 8 special feature of combined effects. Early shock could be prevented and early stage death peak disappeared through fluid replacement to the combined injury animals, meanwhile, severe damage of intestinal epithelium resulted by the shock mitigated. Thus, if the shock was effectively treated, further treatment and regeneration of intestinal epithelium could become possible.