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Photodynamic Therapy Using Systemic Administration of 5-Aminolevulinic Acid and a 410-nm Wavelength Light-Emitting Diode for Methicillin-Resistant Staphylococcus aureus-Infected Ulcers in Mice

机译:使用5-氨基乙酰丙酸和410 nm波长发光二极管的全身给药对耐甲氧西林金黄色葡萄球菌感染的小鼠的溃疡进行光动力治疗。

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摘要

Bacterial resistance to antibiotics has become a worldwide problem. One potential alternative for bacterial control is photodynamic therapy. 5-aminolevulinic acid is a natural precursor of the photosensitizer protoporphyrin IX. Relatively little is known about the antibacterial efficacy of photodynamic therapy using the systemic administration of 5-aminolevulinic acid; a few reports have shown that 5-aminolevulinic acid exerts photodynamic effects on methicillin-resistant Staphylococcus aureus (MRSA) in vitro. In this study, we evaluated the effectiveness of photodynamic therapy using 5-aminolevulinic acid and a 410-nm wavelength light-emitting diode in vitro and in vivo for the treatment of MRSA. We found that 5-aminolevulinic acid photodynamic therapy with the light-emitting diode had an in-vitro bactericidal effect on MRSA. In vivo, protoporphyrin IX successfully accumulated in MRSA on ulcer surfaces after intraperitoneal administration of 5-aminolevulinic acid to mice. Furthermore, 5-aminolevulinic acid photodynamic therapy accelerated wound healing and decreased bacterial counts on ulcer surfaces; in contrast, vancomycin treatment did not accelerate wound healing. Our findings indicate that 5-aminolevulinic acid photodynamic therapy may be a new treatment option for MRSA-infected wounds.
机译:细菌对抗生素的耐药性已成为世界性的问题。细菌控制的一种潜在替代方法是光动力疗法。 5-氨基乙酰丙酸是光敏剂原卟啉IX的天然前体。关于使用5-氨基乙酰丙酸全身给药的光动力疗法的抗菌功效知之甚少。一些报道表明5-氨基乙酰丙酸在体外对耐甲氧西林的金黄色葡萄球菌(MRSA)具有光动力作用。在这项研究中,我们评估了在体外和体内使用5-氨基乙酰丙酸和410 nm波长发光二极管进行光动力疗法治疗MRSA的有效性。我们发现使用发光二极管的5-氨基乙酰丙酸光动力疗法对MRSA具有体外杀菌作用。在体内,腹膜内给予小鼠5-氨基乙酰丙酸后,原卟啉IX成功地在溃疡表面的MRSA中积累。此外,5-氨基乙酰丙酸光动力疗法可加速伤口愈合并减少溃疡表面的细菌数量。相反,万古霉素治疗不能促进伤口愈合。我们的发现表明,5-氨基乙酰丙酸光动力疗法可能是MRSA感染伤口的一种新的治疗选择。

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