大肠杆菌和金黄色杆菌通过相同的机制抵抗银纳米粒子,但通过不同的途径
Lucie Hochvaldová1, David Panáček1,2, Lucie Válková1,3
1Department of Physical Chemistry, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12, 771 46, Olomouc, Czech Republic.
Communications biology
|November 21, 2024
概括
细菌可以对银纳米颗粒产生抵抗力,银纳米颗粒是一种常见的抗菌材料. 这项研究揭示了格拉姆阳性和格拉姆阴性细菌的独特抵抗机制,提供了克服这一挑战的策略.
科学领域:
- 纳米医学是一种纳米医学.
- 微生物学 微生物学
- 材料科学 材料科学 材料科学
背景情况:
- 抗菌纳米结构材料面临着细菌耐药性,类似于传统的抗生素.
- 细菌对纳米材料耐药性的机制尚不清楚.
- 银纳米粒子 (AgNPs) 由于其抗菌特性而广泛使用.
研究的目的:
- 研究细菌对银纳米颗粒的耐药性的出现和机制.
- 为了比较格拉姆阳性 (黄金葡萄球菌) 和格拉姆阴性 (大肠杆菌) 细菌的耐药性发展.
- 确定克服AgNP耐药性的策略.
主要方法:
- 重复培养S. aureus和E. coli,其AgNPs的度低于致命水平.
- 确定AgNPs的最小抑制度 (MICs).
- 对AgNP沉物和细菌表面成分 (鞭毛菌,生物膜) 的化学分析.
- 测试石榴树皮提取物和石墨烯-AgNP复合物以克服抗性.
主要成果:
- 黄金菌和大肠杆菌都对AgNPs产生了显著的耐药性,MIC增加到54mg/L.
- 细菌耐药性机制涉及AgNP聚合到黑色沉物中.
- 大肠杆菌的耐药性是由鞭毛素的产生引发的,而金黄色细菌的耐药性则是由于生物膜的形成.
- 石榴皮提取物和石墨烯-AgNP复合物有效抑制了AgNP聚合,并恢复了AgNP的有效性.
结论:
- 细菌对AgNP的耐药性涉及不同的聚合机制,取决于细菌类型.
- 旗素的产生 (大肠杆菌) 和生物膜的形成 (金黄色杆菌) 是AgNP聚合的关键触发因素.
- 石榴皮提取物和稳定AgNP提供了有希望的策略来打击纳米药物耐药性.
相关概念视频
01:30Development of Antibiotic Resistance
Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
01:31Defense Against Bacterial Pathogens
1.4K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.4K
01:28Gene Regulation in Microbial Communities: Quorum Sensing
3
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
3
00:57Antibiotic Selection
52.3K
Overview
52.3K
01:28Antimicrobial Effectiveness
2
The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
2
01:27Combined Effects of Drugs: Synergism
3.7K
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Such synergistic combinations...
3.7K