本文主要研究内容
作者丁晓宇(2019)在《基于pH/H2O2双响应的自供氧纳米诊疗系统的构建及应用研究》一文中研究指出:目的:肿瘤部位乏氧和血管增生是导致多药耐药(MDR)产生和癌症转移的主要原因。本研究构建具有产氧功能的智能靶向控释递送系统(FA-BSA-MnO2/DOX/siRNA),并对其理化性质进行表征,系统开展了体外逆转耐药性、体内外抗肿瘤转移及磁共振成像(MRI)等研究。方法:(1)FA-BSA-MnO2/DOX/siRNA纳米粒的制备与表征:以牛血清白蛋白(BSA)为载体,碱性条件下,BSA与Mn2+经生物矿化反应生成可产氧的BSA-MnO2纳米载体;然后,通过去溶剂交联法将基因药物小干扰RNA(siRNA)和化疗药阿霉素(DOX)包埋于该载体中;最后,利用酰胺键在载体表面修饰叶酸(FA),构建了FA-BSA-MnO2/DOX/siRNA纳米递送系统。采用紫外(UV-vis)、红外光谱(FT-IR)和X射线光电子能谱分析(XPS)对其结构和光学特性进行表征;透射电镜(TEM)和激光纳米粒度仪(DLS)观察其形态及粒径,便携式溶解氧测定仪检测纳米复合物产氧特性;3T核磁共振成像扫描仪表征其MRI能力;凝胶电泳考察siRNA的血清稳定性等。(2)体外抗化疗耐药性研究:以人源耐DOX的乳腺癌细胞(MCF-7/ADR)为研究对象,采用荧光显微镜和流式细胞仪观察并定量分析细胞对系统的摄取能力;MTT法考察在常氧/乏氧环境下,系统对细胞生长的抑制作用;Western blot考察系统对耐药相关蛋白表达的影响。(3)体外抗转移研究:以鼠源(4T1)转移性乳腺癌细胞为模型,考察细胞的摄取率和抑制率,通过划痕、Transwell实验评价系统对细胞迁移和侵袭能力的影响。(4)体内分布、成像及药效学研究:以4T1荷瘤小鼠为动物模型,通过活体荧光成像仪考察递送系统在小鼠体内的组织分布;采用3T MRI扫描仪考察递送系统体内MRI特性;观察瘤体积变化、小鼠体重和组织HE病理切片,考察系统对原位肿瘤的体内抑制效果;Western blot考察系统对转移相关细胞因子表达的影响;通过观察转移动物模型的肺结节评价递送系统的抗转移活性。结果:UV-vis、FT-IR和TEM等结果表明:成功制备了FA-BSA-MnO2/DO X/siRNA纳米粒,粒径约80 nm,呈球状,DOX的包封率达94%,递送系统能产生大量O2,且具有良好的MRI成像特性,凝胶电泳结果表明siRNA在血清中较稳定;pH 5.0和100μM H2O2条件下,该递送系统可响应性释放药物,DOX释放率达86.3%。以MCF-7/ADR耐药细胞为模型,其对纳米复合物的摄取率较游离的DOX更高;细胞抑制率结果表明:该系统将化疗与基因治疗相结合,可显著抑制癌细胞生长;Western blot结果表明该系统可显著下调HIF-1α、P-gp和VEGF的表达,可改善耐药肿瘤细胞的疗效。体外抗转移性研究中,细胞摄取结果证明:系统增加了细胞对药物的摄入,并对4T1细胞的抑制率达83.9±1.3%,与对照组相比具有显著性差异(P<0.05)。划痕、Transwell结果表明递送系统可抑制细胞的迁移和侵袭。小鼠活体成像显示:肿瘤内的荧光信号最强且12 h积累量最大;体内研究表明:纳米系统具有较好的T1核磁成像特性、较强的肿瘤抑制和抗肿瘤转移作用。结论:制备的FA-BSA-MnO2/DOX/siRNA药物递送系统具有pH/H2O2响应性释药特点,通过增加肿瘤处氧含量和血管抑制策略,用于逆转MDR和防止癌症转移。
Abstract
mu de :zhong liu bu wei fa yang he xie guan zeng sheng shi dao zhi duo yao nai yao (MDR)chan sheng he ai zheng zhuai yi de zhu yao yuan yin 。ben yan jiu gou jian ju you chan yang gong neng de zhi neng ba xiang kong shi di song ji tong (FA-BSA-MnO2/DOX/siRNA),bing dui ji li hua xing zhi jin hang biao zheng ,ji tong kai zhan le ti wai ni zhuai nai yao xing 、ti nei wai kang zhong liu zhuai yi ji ci gong zhen cheng xiang (MRI)deng yan jiu 。fang fa :(1)FA-BSA-MnO2/DOX/siRNAna mi li de zhi bei yu biao zheng :yi niu xie qing bai dan bai (BSA)wei zai ti ,jian xing tiao jian xia ,BSAyu Mn2+jing sheng wu kuang hua fan ying sheng cheng ke chan yang de BSA-MnO2na mi zai ti ;ran hou ,tong guo qu rong ji jiao lian fa jiang ji yin yao wu xiao gan rao RNA(siRNA)he hua liao yao a mei su (DOX)bao mai yu gai zai ti zhong ;zui hou ,li yong xian an jian zai zai ti biao mian xiu shi xie suan (FA),gou jian le FA-BSA-MnO2/DOX/siRNAna mi di song ji tong 。cai yong zi wai (UV-vis)、gong wai guang pu (FT-IR)he Xshe xian guang dian zi neng pu fen xi (XPS)dui ji jie gou he guang xue te xing jin hang biao zheng ;tou she dian jing (TEM)he ji guang na mi li du yi (DLS)guan cha ji xing tai ji li jing ,bian xie shi rong jie yang ce ding yi jian ce na mi fu ge wu chan yang te xing ;3The ci gong zhen cheng xiang sao miao yi biao zheng ji MRIneng li ;ning jiao dian yong kao cha siRNAde xie qing wen ding xing deng 。(2)ti wai kang hua liao nai yao xing yan jiu :yi ren yuan nai DOXde ru xian ai xi bao (MCF-7/ADR)wei yan jiu dui xiang ,cai yong ying guang xian wei jing he liu shi xi bao yi guan cha bing ding liang fen xi xi bao dui ji tong de she qu neng li ;MTTfa kao cha zai chang yang /fa yang huan jing xia ,ji tong dui xi bao sheng chang de yi zhi zuo yong ;Western blotkao cha ji tong dui nai yao xiang guan dan bai biao da de ying xiang 。(3)ti wai kang zhuai yi yan jiu :yi shu yuan (4T1)zhuai yi xing ru xian ai xi bao wei mo xing ,kao cha xi bao de she qu lv he yi zhi lv ,tong guo hua hen 、Transwellshi yan ping jia ji tong dui xi bao qian yi he qin xi neng li de ying xiang 。(4)ti nei fen bu 、cheng xiang ji yao xiao xue yan jiu :yi 4T1he liu xiao shu wei dong wu mo xing ,tong guo huo ti ying guang cheng xiang yi kao cha di song ji tong zai xiao shu ti nei de zu zhi fen bu ;cai yong 3T MRIsao miao yi kao cha di song ji tong ti nei MRIte xing ;guan cha liu ti ji bian hua 、xiao shu ti chong he zu zhi HEbing li qie pian ,kao cha ji tong dui yuan wei zhong liu de ti nei yi zhi xiao guo ;Western blotkao cha ji tong dui zhuai yi xiang guan xi bao yin zi biao da de ying xiang ;tong guo guan cha zhuai yi dong wu mo xing de fei jie jie ping jia di song ji tong de kang zhuai yi huo xing 。jie guo :UV-vis、FT-IRhe TEMdeng jie guo biao ming :cheng gong zhi bei le FA-BSA-MnO2/DO X/siRNAna mi li ,li jing yao 80 nm,cheng qiu zhuang ,DOXde bao feng lv da 94%,di song ji tong neng chan sheng da liang O2,ju ju you liang hao de MRIcheng xiang te xing ,ning jiao dian yong jie guo biao ming siRNAzai xie qing zhong jiao wen ding ;pH 5.0he 100μM H2O2tiao jian xia ,gai di song ji tong ke xiang ying xing shi fang yao wu ,DOXshi fang lv da 86.3%。yi MCF-7/ADRnai yao xi bao wei mo xing ,ji dui na mi fu ge wu de she qu lv jiao you li de DOXgeng gao ;xi bao yi zhi lv jie guo biao ming :gai ji tong jiang hua liao yu ji yin zhi liao xiang jie ge ,ke xian zhe yi zhi ai xi bao sheng chang ;Western blotjie guo biao ming gai ji tong ke xian zhe xia diao HIF-1α、P-gphe VEGFde biao da ,ke gai shan nai yao zhong liu xi bao de liao xiao 。ti wai kang zhuai yi xing yan jiu zhong ,xi bao she qu jie guo zheng ming :ji tong zeng jia le xi bao dui yao wu de she ru ,bing dui 4T1xi bao de yi zhi lv da 83.9±1.3%,yu dui zhao zu xiang bi ju you xian zhe xing cha yi (P<0.05)。hua hen 、Transwelljie guo biao ming di song ji tong ke yi zhi xi bao de qian yi he qin xi 。xiao shu huo ti cheng xiang xian shi :zhong liu nei de ying guang xin hao zui jiang ju 12 hji lei liang zui da ;ti nei yan jiu biao ming :na mi ji tong ju you jiao hao de T1he ci cheng xiang te xing 、jiao jiang de zhong liu yi zhi he kang zhong liu zhuai yi zuo yong 。jie lun :zhi bei de FA-BSA-MnO2/DOX/siRNAyao wu di song ji tong ju you pH/H2O2xiang ying xing shi yao te dian ,tong guo zeng jia zhong liu chu yang han liang he xie guan yi zhi ce lve ,yong yu ni zhuai MDRhe fang zhi ai zheng zhuai yi 。
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论文作者分别是来自郑州大学的丁晓宇,发表于刊物郑州大学2019-07-03论文,是一篇关于响应论文,多药耐药论文,血管生成论文,转移论文,自产氧论文,郑州大学2019-07-03论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自郑州大学2019-07-03论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。