申请人:CeramOptec Industries, Inc.
公开号:US20040186087A1
公开(公告)日:2004-09-23
Siderophore-photosensitizer conjugates, their synthesis and use in photodynamic antimicrobial therapy (PACT) is disclosed. The advantage of this method is improvement of photodynamic antimicrobial therapy against, for example, pathogenic micro-organisms such as bacteria and fungi. Naturally occurring and synthetically available siderophore structures are conjugated chemically with photoactive compounds such as Chlorin e
6
to improve their penetration into bacterial cells and to increase antibacterial efficacy of photosensitizers via microbial proteins that recognize and transport iron-loaded siderophores. In this way, photosensitizers can be transported inside bacteria that otherwise could not cross the cell wall and membranes. Photodynamic activation of photosensitizers inside the cells of pathogenic microbes enables a more effective inhibition of cellular functions than application at the outer side of the cells. The siderophore-transporting systems of microbes are known to be specific for bacteria and fungi. Consequently, siderophore conjugates with photosensitizers are not taken up by mammalian cells and photodynamic effects can thus be exerted specifically on pathogenic microbes. Applications of these conjugates include highly efficient treatment of pathogenic gram-negative and -positive bacteria such as
Pseudomonas aeruginosa, Escherichia coli, Streptococcus pyogenes, Staphylococcus aureus
, treatment of microbial infections that often occur in chronic wounds as well as therapy of other antibiotic resistant microbial infections.
本文介绍了铁载体-光敏剂共轭物的合成和在光动力抗微生物治疗(PACT)中的应用。该方法的优点是改善了光动力抗微生物治疗,例如对抗细菌和真菌这样的病原微生物。通过化学手段将天然存在和人工合成的铁载体结构与光活性化合物(例如氯林e6)结合,可以提高光敏剂进入细菌细胞的渗透性,并通过识别和运输铁载体的微生物蛋白质增加光敏剂的抗菌效力。通过这种方式,光敏剂可以被运输到细菌内部,否则无法穿过细胞壁和膜。在病原微生物的细胞内激活光敏剂,可以更有效地抑制细胞功能,而不是在细胞外应用。微生物的铁载体运输系统已知对细菌和真菌具有特异性。因此,铁载体共轭物与光敏剂不会被哺乳动物细胞摄取,从而可以针对病原微生物特异性地施加光动力效应。这些共轭物的应用包括高效治疗病原的革兰氏阴性和阳性细菌,例如铜绿假单胞菌,大肠杆菌,链球菌,金黄色葡萄球菌,治疗常见于慢性伤口的微生物感染以及其他抗生素耐药微生物感染的治疗。