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Objective To study the radiation injury of rat C6 glioma cell line by high resolution,1 H-nuclear magnetic resonance (1 H NMR) spectroscopy,and to preliminarily investigate its mechanism.Methods Metabolite concentrations in C6 cells were determined by 1 H NMR spectroscopy.Comet assay was used to evaluate DNA damage.Flow cytometry was used to determine the cell cycle and apoptosis rate.Colony-forming assay was used to measure the colony-forming rate and preliminarily investigate the mechanism of radiation injury.The resuhs were analyzed by one-way analysis of variance and Pearson correlation analysis.Results With the increase in radiation dose from 0 Gy to 1,5,10,and 15 Gy,DNA damage was enhanced in a dose-dependent manner (P=0.000-0.690);the percentage of cells in G1 phase increased (P =0.026-0.749);the apoptosis rate significantly increased (all P =0.000);the colony-forming rate significantly declined (P =0.000-0.004);the Lac/Cr ratio significantly decreased (P =0.000-0.015),which had a negative linear correlation with DNA damage parameters (tail length,r=-0.971;％DNA in the tail,r =-0.998;tail moment,r =-0.995) and apoptosis rate (r =0.978).Conclusions 1 H NMR spectroscopy reveals that the change in the Lac/Cr ratio is associated with injury and apoptosis of C6 cells after radiation.1 H NMR spectroscopy has the potential to predict radiation injury of glioma.
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Objective To study the prevalence of tick bites and relative factors of outpatients with fever from health care fa?cilities in Tengchong County. Methods From July to August,2014,the outpatients with fever in five health care facilities namely Tengchong Center for Disease Control and Prevention,Hehua Health Center,Jietou Health Center,Qushi Health Cen?ter and Xinhua Health Center were investigated by questionnaires. The factors related to tick bites were explored with the univari?ate analysis and multiple regression models. Results Totally 884 effect questionnaires were acquired. Among the 884 partici?pants,85(9.6%)had experienced tick bites. The frequency of tick bites was associated with locations,gender,age group,own?ership of cattle,working at foreign country,firewood cutting and lumbering in the forest(all P<0.05). The multiple regression revealed that the male and people raising cattle,working at foreign country,engaging in firewood cutting and lumbering in the forest had a more risk for tick bites. Conclusions Tick bites are common in the residents of Tengchong County. The risk of be?ing bitten varies in different populations. The local health departments should promote health education in the high?risk popula?tion to reduce the risk of infecting tick?borne diseases.
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Objective To investigate the prevalence of nonalcoholic fatty liver disease (NAFLD) and understand the relationship between NAFLD and metabolic risk factors in middle-aged and elderly adults.Methods This cross-sectional study recruited 2 935 subjects in Guangzhou,Guangdong province.Face-to-face interviews and laboratory analyses were conducted to collect general information and other covariates.Analysis of covariance and logistic regression analysis were performed to investigate the relationship between metabolic factors and the prevalence of NAFLD.NAFLD was diagnosed based on standard criteria recommend by the Fatty Liver Disease and Alcoholic Liver Disease Branch of Chinese Hepatology Society,and the degree of steatosis was assessed (mild,moderate or severe).Results Compared with normal subjects,those with NAFLD had higher levels of WC,BMI,FPG,TG,SBP,DBP and greater prevalence of metabolic syndrome,but lower levels of physical activity and HDL-C.After adjusted for covariates,the OR for each standard deviation change was 2.70(95％CI:2.45-2.98) for WC,1.47(95％ CI:1.35-1.59) for SBP,1.48 (95％CI:1.37-1.60) for DBP,1.88 (95％CI:1.66-2.12) for TG,1.25 (95％ CI:1.15-1.36) for FPG and 0.51 (95％CI:0.47-0.56) for HDL-C (all P＜0.001).Higher levels of WC,BMI,TG,SBP,DBP and FPG were significantly related with the increase in degree of NAFLD (P-trend＜0.001).Conclusion There is a relatively high prevalence of NAFLD in middle-aged and elderly adults in China.NAFLD is closely related with the different forms of metabolic syndrome,and WC is the leading risk factor for NAFLD.
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ABSTRACT:To explore the feasibility of DNA barcoding in the identification of sandflies ,the mitochondrial cytochrome c oxidase subunit I (COI) genes of 9 dominant species in China from three genera in the Phlebotominae were studied .The in‐traspecies and interspecies genetic distances were calculated using the Kimura‐2‐parameter model ,and the phylogenetic trees were reconstructed by neighbor‐joining (NJ) method .Results showed that all of sandflies species were successfully distinguish‐ed by the phylogenetic trees .The average intraspecific genetic distance (0 .8% ) was much less than the average interspecific ge‐netic distance (11 .2% ) .The study based on COI sequences indicates that the sandflies from China could be well distinguished with the commonly used COI barcodes ,which are potentially well utilized in sandflies species identification .