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目的 通过体外研究验证金纳米星/胶原(Au nanostars/collagen,AuNSs/Col)复合材料具有抗新生大鼠心室肌细胞氧化应激损伤的作用.方法 (1)构建不同浓度AuNSs/Col复合基质材料,利用Live/dead细胞染色、细胞增殖实验(CCK-8)筛选材料的最佳浓度,和Col共用于后续实验;(2)新生大鼠心室肌细胞(NRVM)随机分为Col组、AuNSs/Col组、过氧化氢(H2 O2)诱导Col组、H2 O2诱导AuNSs/Col组.6 h后,采用AnnexinⅤ-FITC/碘化丙啶(PI)/4′,6-二脒基-2-苯基吲哚(DAPI)染色观察细胞的凋亡情况,蛋白质印迹法检测凋亡相关蛋白B淋巴细胞瘤-2基因(Bcl-2)、Bcl-2相关x蛋白(Bax)的表达.结果 (1)Live/dead和CCK-8实验结果均提示,0.1 mg/ml AuNSs/Col复合材料对NRVM无毒性,且能进一步促进细胞增殖;(2)与未诱导组相比,H2 O2诱导后的Col组和AuNSs/Col组细胞的早期凋亡率均明显增加,Bcl-2/Bax比值降低,氧化应激损伤模型成功建立;H2 O2诱导后,与Col组相比,AuNSs/Col组细胞早期凋亡率降低,Bcl-2/Bax比值升高.结论 AuNSs/Col复合材料对体外培养的心肌细胞氧化损伤具有保护作用.“,”Objective To verify antioxidation of Au NanoStars/collagen ( AuNSs/Col ) for ventricular myocytes of newborn rats(NRVMs) by in vitro studies.Methods (1)Different concentrations of AuNSs/Col composite materials were created.The optimum concentration of the material was selected by Live /dead staining and Cell Counting Kit-8 (CCK-8) and Col was used for subsequent experiments .( 2 ) NRVMs were randomly divided into Col group , AuNSs/Col group, H2O2-induced Col group, and H2O2-induced AuNSs/Col group.After 6 h treatment, apoptotic cell morphology and early cell apoptosis rate were observed with Annexin Ⅴ-FITC/propidium iodide ( PI)/4′,6-diamidino-2-phenylindole ( DAPI) and the expressions of apoptosis related proteins-B-cell lymphoma-2 ( Bcl-2 ) and Bcl-2 associated x protein ( Bax ) were detected by Western blotting .Results ( 1 ) Both Live/dead and CCK-8 experiments indicated that the AuNSs/Col composite material with 0.1 mg/ml was nontoxicity to NRVMs and could further promote their proliferation .(2) Compared with the uninduced group , the early apoptosis rate of the Col group and the AuNSs /Col group after H2O2 induction was significantly increased , while the Bcl-2/Bax ratio was decreased , indicating that the oxidative stress damage model was established.After H2O2 induction, compared with the Col group , the early apoptosis rate of the AuNSs/Col group was decreased , but the Bcl-2/Bax ratio was increased .Conclusion AuNSs/Col composite material has protective effect on the oxidative damage of cardiomyocytes cultured in vitro.