细菌/多肽纳米颗粒复合体的超微结构表征

卿光超,郭宏博,张宇轩,李宪磊,甘雅玲,罗 阳*,梁兴杰*

细菌/多肽纳米颗粒复合体的超微结构表征

卿光超,郭宏博,张宇轩,李宪磊,甘雅玲,罗 阳*,梁兴杰*

(1. 国家纳米科学中心,北京100190;2. 重庆大学医学院,重庆400044)

摘  要   细菌感染严重危害人类健康和公共卫生安全。基于抗菌肽(AMP)的多肽纳米颗粒在对抗细菌耐药中展现出巨大潜力,在多肽纳米颗粒与细菌相互作用的过程中,其超微结构形态的变化对阐明多肽纳米颗粒的抑菌机制至关重要。本文开发了一种对细菌具有较好亲和力的多肽纳米颗粒(BPN),并利用扫描电子显微镜(SEM)和透射电子显微镜(TEM)观察了金黄色葡萄球菌(S. aureus)和铜绿假单胞菌(P. aeruginosa)在结合BPN前后的超微结构形态。结果显示,与BPN共孵育后,细菌表面覆盖着明显的凸起状物质,表明BPN可以有效结合在S. aureusP. aeruginosa表面。

关键词   微观形貌;多肽纳米颗粒;细菌

中图分类号:Q811;Q934;O629 文献标识码:A       doi:10.3969/j.issn.1000-6281.2023.01.007

 

Ultrastructure of bacteria-peptide nanoparticle complex

QING Guang-chao,GUO Hong-bo,ZHANG Yu-xuan,LI Xian-lei,

GAN Ya-ling,LUO Yang*,LIANG Xing-Jie*

(1.National Center for Nanoscience and Technology, Beijing 100190; 2. School of medicine of Chongqing University, Chongqing 400044, China)

Abstract   Bacterial infection is a life-threatening disease and seriously endangers public health. Antimicrobial peptide-based nanomaterials show great potential in combating bacterial antibiotic resistance. The bacterial ultrastructural change after treatment is conducive to elucidate the antibacterial mechanism of peptide-based nanoparticles. Here, we use SEM and TEM to observe the ultrastructure of Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa) when co-incubated with a bacteria-captured peptide nanoparticle (BPN). The results show that bacteria are covered with obvious bulged material after co-incubation with BPN, indicating the effective binding capacity of BPN to S. aureus and P. aeruginosa.

Keywords   micromorphology; peptide nanoparticles; bacteria

 

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