乳腺癌已超过肺癌,成为发病率最高的恶性肿瘤。在此,采用金纳米星(记为AuNS)负载二硫键偶联的喜树碱荧光团前药(记为CPT-SS-FL)形成AuNS@CPT-SS-FL(记为AS)纳米复合材料,其中,进而进一步用透明质酸(HA)封装,得到最终的 AuNS@CPT-SS-FL@HA 纳米平台(表示为ASH)。ASH有效地携带前药并靶向肿瘤细胞表面的CD44受体。肿瘤细胞内源性过度表达的谷胱甘肽(GSH)断裂二硫键,激活前药并释放放射增敏剂药物喜树碱(CPT)和荧光成像试剂罗丹明衍生物作为荧光团(FL)。释放的FL可以实时追踪放射增敏剂喜树碱在肿瘤细胞中的精确释放位置。由于Au元素的原子系数高( Z =79),AuNS具有很强的X射线吸收和沉积能力。同时,AuNS可以通过其温和的光热疗法(PTT)缓解肿瘤微环境(TME)缺氧。因此,通过GSH消耗、Au的高原子系数和减轻缺氧的多重放射增敏作用,
RXH-Reactive <sup>18</sup>F-Vinyl Sulfones as Versatile Agents for PET Probe Construction
作者:Tao Zhang、Jianhua Cai、Hui Wang、Mengzhe Wang、Hong Yuan、Zhanhong Wu、Xiaofen Ma、Zibo Li
DOI:10.1021/acs.bioconjchem.0c00487
日期:2020.11.18
Efficient radiolabeling reactions are important chemical tools in biomedical research especially in probe construction. Herein, three 18F-labeled vinyl sulfones were prepared. In particular, 18F-PEG1-VS (((2-(2-(fluoro-18F)ethoxy)ethyl)sulfonyl)ethane) could not only allow chemoselective labeling of bioactive molecules containing −XH (X = S, NH) groups, but also react with red blood cells both in vitro and in living mice for potential cell tracking applications. In addition, these hydrophilic agents were found to cross the blood brain barrier (BBB) efficiently and localize at the cerebellum region. In summary, 18F-labeled vinyl sulfones provide a versatile platform for PET probe construction.
Photophysics and Photochemistry of the UV Filter Kynurenine Covalently Attached to Amino Acids and to a Model Protein
作者:Peter S. Sherin、Jakob Grilj、Lyudmila V. Kopylova、Vadim V. Yanshole、Yuri P. Tsentalovich、Eric Vauthey
DOI:10.1021/jp104485k
日期:2010.9.16
The photophysics and photochemistry of kynurenine (KN) covalently bound to the amino acids lysine, cysteine, and histidine, the antioxidant glutathione, and the protein lysozyme have been studied by optical spectroscopy with femto- and nanosecond time resolution. The fluorescence quantum yield of the adducts of KN to amino acids is approximately 2 times higher than that of the free KN in solution;
Five-coordinate aminophosphine platinum(II) complexes containing cysteine derivatives as ligands
作者:M.Inés Garcı́a-Seijo、Abraha Habtemariam、Piedad del Socorro Murdoch、Robert O Gould、M.Esther Garcı́a-Fernández
DOI:10.1016/s0020-1693(02)00813-7
日期:2002.6
The platinum(II) complex, [Pt(NP3)Cl]Cl (1) [NP3=N(CH2CH2PPh2)3] reacts with thiol-containing biomolecules such as N-acetyl-l-cysteine (N-Ac-l-CysH) and the tripeptide reduced glutathione (γ-l-Glu-l-Cys-Gly, GSH) to afford the intensely-coloured five-coordinate complexes, [Pt(NP3)(N-Ac-l-Cys-S)] (2) and [Pt(NP3)(GS-S)] (3), respectively. Complex 2 was shown by X-ray crystallography to be trigonal bipyramidal
acids. Each of these defense substances possesses a reactive electrophilic center (vinyl ketone, nitroalkene, or β-ketoaldehyde) responsible for toxicity. We describe the synthesis of radioactively-labelled defense secretions of two of these species and their use in studying the substrate-selective detoxication by worker termites. Preliminary studies on biosynthesis of defense secretions by termite
Synthesis of 11, 12, 14, 15-tetrahydro-leukotriene C,D,E via A
作者:Bernd Spur、Attilio Crea、Wilfried Peters、Wolfgang König
DOI:10.1016/s0040-4039(00)81863-8
日期:——
The synthesis of tetrahydro-7E,9Z-leukotriene A methyl ester and its reaction with glutathione, cysteinylglycine and cysteine providing the tetrahydro analogues of leukotriene C4, C4, E4.