RESUMO
Objective@#To understand health literacy and its associated factors among middle school students in Shenzhen, to provide scientific basis for further formulating targeted intervention measures.@*Methods@#From October to December, 2019, 7 423 middle school students in 10 districts of Shenzhen were selected by multistage stratified random cluster sampling. Multivariate linear regression was used to analyze factors affecting health literacy and scores in each dimensions.@*Results@#The total score for health literacy was(107.39±22.31), including physical activity(16.81±5.28), interpersonal relationship(20.69±4.10), stress management(21.64±5.53), spiritual growth(14.93±3.96), health awareness (15.61±4.96) and nutrition(17.71±4.65). According to the multivariate linear regression analysis, girls, general and vocational high schools, educational level of parents and boarding in school were significantly associated with health literacy of middle school students( B=-3.04, -7.72, -9.99, 1.56, 2.78, -3.85, P < 0.05 ).@*Conclusion@#Middle school students in Shenzhen have a high level of health literacy, which is related to school type and parental educational background. It is suggested that measures should be taken to improve the health literacy of middle school students.
RESUMO
@#目的：探讨miRNA-490-3p调控Smad2/TGF-β对结直肠癌奥沙利铂化疗敏感性的影响。方法：选取100例结直肠癌（colorectal cancer，CRC）根治性手术后奥沙利铂（oxaliplatin，OXA）同种联合化疗患者作为研究对象，根据化疗情况分为耐药组（n=40）和非耐药组（n=60），用qPCR检测两组外周血miRNA-490-3p水平；选取人CRC细胞株SW480和CRC奥沙利铂（OXA）耐药型细胞株OXA-SW480进行研究，先用qPCR检测两种细胞株中miRNA-490-3p表达水平；后将miRNA-490-3p过表达载体转染OXA-SW480（过表达组），并设立空载体组（空载体转染OXA-SW480）和空白对照组（OXA-SW480未经任何处理）。用CCK-8检测各组细胞增殖能力，同时用不同浓度OXA处理各组细胞，计算其半数抑制浓度（IC50）；用Annexin-V-FITC/PI染色流式细胞术检测各组细胞凋亡率；用WB检测各组Smad2和TGF-β蛋白表达水平。结果：在CRC患者中，耐药组外周血miR-490-3p水平显著低于非耐药组，在CRC细胞株中，OXA-SW480耐药株细胞miR-490-3p水平显著低于正常株SW480细胞（P<0.05）。与空载体组和空白对照组相比，过表达组miR-490-3p水平显著降低（均P<0.05），增殖抑制率显著升高（均P<0.05），细胞凋亡率显著升高（均P<0.01），Smad2蛋白水平显著降低（均P<0.05），TGF-β蛋白水平显著升高（均P<0.05）。经OXA处理后，过表达组的IC50显著低于空载体组和空白对照组（均P<0.05）。经Pearson相关法分析，miR-490-3p与Smad2的表达呈负相关（r=–0.943，P<0.01），miR-490-3p与TGF-β的表达呈正相关（r=0.961，P<0.01）。结论：过表达miRNA-490-3p可增加CRC SW480细胞的OXA敏感性，此作用Smad2/TGF-β信号通路有关。