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Paclitaxelloadedliposomesdecoratedwithamultifunctionaltandempeptideforgliomatargetingcellpenetratingpeptides(CPP),aclassofdiverseshortpeptideswidelyusedforsiRNA,proteinsandsmallmoleculardrugsdelivery,alsohavetheabilitytocarrydrugstopenetrateBBBefficiently,non-specificaffinitytodifferentcells,Leadtounwantedtoxicitytonormalbraintissues.addaselectivedomaintoCPPorenhancethepenetratingcapabilityofspecificligands,,atandempeptidewithmultifunctionswasdesignedhere.(Thiskindoftandempeptidewasconsistedofaspecificpeptideinthefrontpositionandacellpenetratingpeptideinthebackendsothatitcouldpossessbothspecifictargetingandhighpenetratingability.)设计思路材料cyclicRGD[c(RGDfK)]andocta-arginine(R8)(以酰胺键连接,赖氨酸与精氨酸)Paclitaxel-liposome–microbubblecomplexesasultrasound-triggeredtherapeuticdrugdeliverycarriersLMC-DOX-us已经有人做过了,所以选择了紫杉醇?微泡原理将少量携带基因或药物的微泡经外周静脉或局部注射后,微泡流经靶向部位时进行超声检查,即得到超声影像。当超声影像图证明超声准确定位于靶向部位时,增加声压使之达到一定强度,即可使微泡破裂产生空化效应,空化效应是指存在于液态物质中的微小空泡(空化核)在高强度超声的作用下被激发,空化核急剧膨胀和收缩直至爆裂,此过程中空化核吸收了大量的声能,并将能量集中释放在极小的区域,核内局部温度和压力急剧升高,随之产生强大冲击波、内切力、高速微束射流及自由基等二次效应,不仅使微血管破裂,血管内皮细胞收缩,细胞间隙增宽,微血管壁的通透性增大,还可使细胞膜的完整性遭到破坏,产生暂时性、可逆性的小孔,增加了细胞膜的通透性,均能够增强载药微泡对基因或药物的转移Reversalofmultidrugresistancephenotypeinhumanbreastcancercellsusingdoxorubicin-liposome–microbubblecomplexesassistedbyultrasoundKeywordsDoxorubicin-liposome–microbubblecomplexes;Multidrugresistance;Ultrasound;Doxorubicin;Drugdelivery1,2distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethyleneglycol)-2000](DSPE-PEG2000)1,2-distearoyl-sn-glycero-3-phosphatidylcholine(DSPC),dipalmitoylphosphatidylcholine(DPPC)1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[biotinyl(polyethyleneGlycol)2000](DSPE-PEG2000-Biotin)Perfluoropropane(C3F8)材料DPPC:cholesterol:DSPE-PEG-biotininthemolarratioof60:40:5(薄膜-透析法)2.2.PreparationofbiotinylatedDOX-liposomes(DL)2.3.PreparationofMBsandDOX-liposome–microbubblecomplexes(DLMC)2.4.CellcultureThedoxorubicinresistantMCF-7cellline2.5.DeterminationofDOXuptakeandretentioninDOX-resistantcells3.8.DownregulationofP-glycoproteinproteinlevel(wb实验)3.5.IncreaseDNAdamageinMCF-7/ADRcells减少ROSlevelsinMCF-7/ADRcellsApoptosisofMCF-7/ADRinducedbyDLMCandUS结果由于显著增加细胞毒性由于复合物的优势,例如1,高细胞摄取和细胞内的快速转运2,减少P糖蛋白的表达-由于DNA单链的断裂3,细胞程序性死亡的增加morepronouncedγ-H2AXfocistaininginresistantcancercells,indicatingamoredramaticDNAdamageintheseresistantcells.讨论逆转多药耐药微泡-脂质体治疗,多药耐药,若脂质体是一个线粒体靶向的,多药耐药的效果会不会更好呢?--文献中提到其多药耐药更多的功能是因为对细胞核的作用,从而减少糖蛋白的表达PH敏感脂质体加上微泡,是否可以双靶向,阿霉素,BCRP,需要考虑的问题,超声是否会破坏脂质体复合物的结构。。。但也不影响,j进入细胞的一般都是脂质体,或者说是否还有靶向的必要
本文标题:微泡-脂质体复合物
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