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gsc1989

银虫 (小有名气)

应助: 2 (幼儿园)
金币: 384
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在线: 35.5小时
虫号: 2042958
注册: 2012-10-04
性别: GG
专业: 药剂学

[求助] 求助一篇文献，药剂学脂质体避免抗生素耐药性的

title：Liposomal encapsulation of vancomycin improves killing of methicillin-resistant Staphylococcus aureus in a murine infection model.
Abstract
OBJECTIVES: Methicillin-resistant Staphylococcus aureus (MRSA) poses a major problem to public health worldwide. MRSA strains with increased resistance to vancomycin cause infections that are associated with greater morbidity and threaten the use of this once gold-standard antistaphylococcal drug. We investigated whether encapsulation of vancomycin within liposomes could improve its antistaphylococcal activity.

METHODS: Two liposomal formulations of vancomycin were prepared using a rehydration-dehydration method. MICs and MBCs of the liposomal vancomycin for strains of MRSA were determined. The efficacy of one of the liposomal vancomycin formulations was also investigated in a time-kill assay in vitro and in a murine systemic infection model.

RESULTS: Encapsulation in either liposome preparation decreased the vancomycin MICs and MBCs for MRSA strains by approximately 2-fold. Liposomal vancomycin increased killing of MRSA in vitro in a kinetic study. In a systemic murine infection model, treatment with a 50 mg/kg intraperitoneal injection of liposomal vancomycin improved kidney clearance of a USA300 strain by 1 log compared with an injection of 50 mg/kg of free vancomycin.

CONCLUSIONS: Our findings suggest that entrapment within liposomes could improve the antistaphylococcal efficacy of vancomycin.

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