背景:在这项研究中,纳米技术的结合,利用有机合成和放射化学来设计一种有效的纳米系统,该系统与合适的放射性核素和抗肿瘤剂缀合,可用作肿瘤治疗无关剂。
方法:设计了4种带有四氢喹唑啉-7-磺酰肼或1,2,3,4-四氢喹唑啉-7-磺酰胺支架的新型化合物(3和4a-c)。然后,对接研究预测该化合物可被认为是PARP-1的潜在抑制剂。随后,合成了这四种化合物,并使用1HNMR对其进行了适当的表征,13CNMR,IR和质谱。评估了四种化合物对乳腺癌细胞系(MDA-MB-436)的细胞毒性作用,其中化合物3显示出最有希望的细胞毒性作用。在体外评价四种化合物对PARP-1的抑制作用。
结果:通过改良的悍马方法合成了羧基化氧化石墨烯纳米片(NGO-COOH),尺寸范围为40nm。当针对正常人肺成纤维细胞(MRC-5)进行体外测试时,NGO-COOH纳米片被证明是安全且生物相容的。将制备的NGO-COOH纳米片与化合物3缀合,然后用99mTc放射性标记以产生99mTc-NGO-COOH-3,放射化学产率为98.5.0±0.5%。将99mTc-NGO-COOH-3静脉注射到带有实体瘤的小鼠中,以研究纳米系统在肿瘤组织中的定位程度。研究结果显示,设计的纳米系统在肿瘤组织中具有优异的定位和保留,靶向比为9.0。
结论:搅拌了一种安全的新的候选肿瘤治疗药物,选择性和稳定性。
BACKGROUND: In this
study, a combination of nanotechnology, organic synthesis and radiochemistry were utilized in order to design an efficient nano-system conjugated with a suitable radionuclide and an antitumor agent for possible application as tumor theragnostic agent.
METHODS: Four novel compounds (3 and 4a-c) bearing tetrahydroquinazoline-7-sulfonohydrazide or 1,2,3,4-tetrahydroquinazoline-7-sulfonamide scaffold were designed. Then, docking
study predicted that the compounds can be considered as potential inhibitors for PARP-1. Following that; the four compounds were synthesized and properly characterized using 1HNMR, 13CNMR, IR and Mass spectroscopy. The cytotoxic effect of the four compounds was evaluated against breast cancer cell line (MDA-MB-436), where compound 3 showed the most promising cytotoxic effect. The inhibitory effect of the four compounds was evaluated in vitro against PARP-1.
RESULTS: Carboxylated graphene oxide nanosheets (NGO-COOH) were synthesized by a modified Hummer\'s method and has size of range 40 nm. The NGO-COOH nanosheets were proven to be safe and biocompatible when tested in vitro against normal human lung fibroblast cells (MRC-5). The prepared NGO-COOH nanosheets were conjugated with compound 3 then radiolabeled with 99mTc to yield 99mTc-NGO-COOH-3 with a radiochemical yield of 98.5.0 ± 0.5%. 99mTc-NGO-COOH-3 was injected intravenously in solid tumor bearing mice to
study the degree of localization of the nano-system at tumor tissue. The results of the
study revealed, excellent localization and retention of the designed nano-system at tumor tissues with targeting ratio of 9.0.
CONCLUSIONS: Stirred a new candidate tumor theragnostic agent that is safe, selective and stable.