Evaluation of antimicrobial photodynamic action of a pluronic and pectin based film loaded with methylene blue against methicillin resistant Staphylococcus aureus

亚甲蓝 抗菌剂 金黄色葡萄球菌 材料科学 果胶 泊洛沙姆 微生物学 纳米技术 化学 聚合物 细菌 有机化学 复合材料 共聚物 生物 生物化学 遗传学 光催化 催化作用
作者
Sourabrata Chakraborty,Shivangi Shukla,Mahima Rastogi,Sai Sarbani Mund,Anupam Chowdhury,C. Mukherjee,Khageswar Sahu,Shovan K. Majumder
出处
期刊:Biomedical Materials [IOP Publishing]
卷期号:19 (2): 025004-025004 被引量:1
标识
DOI:10.1088/1748-605x/ad1bb3
摘要

Abstract Antimicrobial wound dressings play a crucial role in treatment of wound infections. However, existing commercial options fall short due to antibiotic resistance and the limited spectrum of activity of newly emerging antimicrobials against bacteria that are frequently encountered in wound infections. Antimicrobial photodynamic therapy (aPDT) is very promising alternative therapeutic approach against antibiotic resistant microbes such as methicillin resistant Staphylococcus aureus (MRSA) . However, delivery of the photosensitizer (PS) homogeneously to the wound site is a challenge. Though polymeric wound dressings based on synthetic and biopolymers are being explored for aPDT, there is paucity of data regarding their in vivo efficacy. Moreover, there are no studies on use of PS loaded, pluoronic (PL) and pectin (PC) based films for aPDT. We report development of a polymeric film for potential use in aPDT. The film was prepared using PL and PC via solvent casting approach and impregnated with methylene blue (MB) for photodynamic inactivation of MRSA in vitro and in vivo . Atomic force microscopic imaging of the films yielded vivid pictures of surface topography, with rough surfaces, pores, and furrows. The PL:PC ratio (2:3) was optimized that would result in an intact film but exhibit rapid release of MB in time scale suitable for aPDT. The film showed good antibacterial activity against planktonic suspension, biofilm of MRSA upon exposure to red light. Investigations on MRSA infected excisional wounds of mice reveal that topical application of MB loaded film for 30 min followed by red light exposure for 5 min (fluence; ∼30 J cm −2 ) or 10 min (fluence; ∼60 J cm −2 ) reduces ∼80% or ∼92% of bioburden, respectively. Importantly, the film elicits no significant cytotoxicity against keratinocytes and human adipose derived mesenchymal stem cells. Taken together, our data demonstrate that PS-loaded PL-PC based films are a promising new tool for treatment of MRSA infected wounds.
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