首页> 外文期刊>Journal of Microencapsulation: Microcapsules Liposomes Nanoparticles Microcells Microspheres >New platform for controlled and sustained delivery of the EGF receptor tyrosine kinase inhibitor AG1478 using poly(lactic-co-glycolic acid) microspheres
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New platform for controlled and sustained delivery of the EGF receptor tyrosine kinase inhibitor AG1478 using poly(lactic-co-glycolic acid) microspheres

机译:使用聚乳酸-乙醇酸微球控制和持续递送EGF受体酪氨酸激酶抑制剂AG1478的新平台

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摘要

Inhibition of the epidermal growth factor receptor (EGFR) reduces tumour growth and metastases and promotes axon regeneration in the central nervous system. Current EGFR inhibition strategies include the administration of reversible small-molecule tyrosine kinase inhibitors (TKIs). However, to be effective in vivo sustained delivery is required. This study explored the feasibility of encapsulating the tyrphostin 4-(3-chloroanilino)-6,7-dimethoxyquinazoline (AG1478) in poly(lactic-co-glycolic acid) (PLGA) microspheres using three different emulsion methods: solid-in-oil-in-water, oil-in-water and oil-in-water with co-solvent. Addition of a co-solvent increased loading and release of AG1478 and significantly (p<0.001) decreased microsphere size. Co-solvent addition also prolonged AG1478 release from 6 months to over 9 months. Once released AG1478 remained bioactive and inhibited EGFR in immortalized rat fibroblasts and EGFR-amplified human carcinoma cells. These results demonstrate that AG1478 can be encapsulated in PLGA with sustained release and retain bioactivity; thereby providing a new platform for controlled administration of EGFR TKIs.
机译:表皮生长因子受体(EGFR)的抑制作用会减少肿瘤的生长和转移,并促进中枢神经系统中的轴突再生。当前的EGFR抑制策略包括可逆小分子酪氨酸激酶抑制剂(TKIs)的施用。然而,需要有效的体内持续递送。这项研究探索了使用三种不同的乳化方法将酪氨酸酪蛋白4-(3-氯苯胺基)-6,7-二甲氧基喹唑啉(AG1478)封装在聚(乳酸-乙醇酸)(PLGA)微球中的可行性。 -水,水包油和水包油与助溶剂。加入助溶剂会增加AG1478的负载和释放,并显着(p <0.001)减小微球尺寸。添加共溶剂还将AG1478的释放从6个月延长至9个月以上。一旦释放,AG1478在永生的大鼠成纤维细胞和EGFR扩增的人类癌细胞中仍然具有生物活性并抑制EGFR。这些结果表明,AG1478可以被包封在PLGA中,具有持续释放并保留生物活性。从而为EGFR TKI的受控管理提供了新的平台。

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