塞菲德罗科尔是"被围困的"吗? 了解NDM介导的新型药物耐药性的增加
Brenda A Warecki1, Pablo E Tomatis1,2, María F Mojica3,4,5
1Instituto de Biología Molecular y Celular de Rosario (IBR), CONICET, Universidad Nacional de Rosario Rosario Argentina vila@ibr-conicet.gov.ar.
Chemical science
|June 13, 2025
概括
抗菌素耐药性 (AMR) 正在上升,金属β-乳糖酶 (MBLs) 构成重大威胁. 塞菲德罗科尔 (FDC) 对一些MBLs表现出耐药性,但NDM变种可以使其失活,需要谨慎和潜在的组合疗法.
科学领域:
- 微生物学 微生物学
- 药物发现 药物发现 药物发现
- 生物化学 生物化学
背景情况:
- 全球抗菌素耐药性 (AMR) 的上升,特别是来自金属β-乳酸酶 (MBLs),需要新的治疗药物.
- 一种头素的Cefiderocol (FDC) 开发用于对抗产生MBL的グラム阴性病原体,包括NDM,VIM和IMP类型.
- 对FDC的新兴耐药性,通常与NDM类型的MBL和铁载体变化有关,挑战了它的有效性.
研究的目的:
- 调查NDM,VIM和IMPMBL与 cefiderocol (FDC) 相互作用和水解的机制.
- 阐明由特定的MBL变体介导的FDC电阻的结构基础.
- 提供对FDC耐药性的机制性见解,以指导临床治疗策略.
主要方法:
- 进行了酶分析,以评估NDM-1,NDM-5,VIM-2和IMP-1对FDC的催化效率.
- 分析可逆酶产物添加物形成及其在不同MBL中与FDC的寿命.
- 动力学研究,以确定每个MBL-FDC相互作用的抑制和周转率.
主要成果:
- NDM-1和NDM-5有效地禁用FDC,而VIM-2和IMP-1的催化效率降低.
- 所有测试的MBL都与FDC形成可逆 adduct,但 adduct的稳定性有很大的差异.
- 与有效抑制的VIM-2和IMP-1不同,NDM变异体表现出低抑制和高转换率的FDC.
结论:
- NDM类型的MBL可以有效地化FDC,解释观察到的临床耐药性.
- 该机制涉及FDC对NDM的抑制不足,导致有效的基质周转.
- 建议在使用FDC对NDM产生病原体时谨慎使用;与NDM抑制剂的联合治疗可能会保持FDC的有效性.
相关概念视频
Treatment Resistant Cancers
3.3K
Cancer is the second leading cause of death in the United States. A cancer cell is genetically unstable and hence can mutate faster. They can also modify their microenvironment and escape immune surveillance. The difficulties in treating cancer are further compounded by the emergence of rapid resistance to anticancer drugs. The most common ways to attain resistance in cancer cells include alteration in drug transport and metabolism, modification of drug target, elevated DNA damage response, or...
3.3K
Antibiotic Selection
52.4K
Overview
52.4K
Defense 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
Combined Effects of Drugs: Synergism
3.8K
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...
3.8K
Cytotoxic T Cells-mediated Immune Response
861
Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
861
Nonlinear Pharmacokinetics: Causes of Nonlinearity
151
Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens.
Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...
Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...
151


