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AMXT-1501 targets membrane phospholipids against Gram-positive and -negative multidrug-resistant bacteria

Jinxin Zheng1, Xiaoju Liu1, Yanpeng Xiong1

  • 1Department of Infectious Diseases and Shenzhen Key Lab of Endogenous Infection, Shenzhen Nanshan People's Hospital and the 6th Affiliated Hospital of Shenzhen University Medical School, Shenzhen, People's Republic of China.

Emerging Microbes & Infections
|February 29, 2024
PubMed

Insights

A novel polyamine transport system inhibitor, AMXT-1501, shows broad-spectrum antibacterial activity against multidrug-resistant (MDR) bacteria, including Gram-positive and Gram-negative pathogens. This compound effectively reduces bacterial growth and biofilm formation without readily inducing resistance.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Drug Discovery

Background:

  • Multidrug-resistant (MDR) bacterial pathogens, particularly carbapenem-resistant (CR) Enterobacteriaceae, present a significant global health threat due to limited treatment options.
  • The emergence of resistance necessitates the development of novel antimicrobial agents with unique mechanisms of action.

Purpose of the Study:

  • To identify and characterize AMXT-1501, a novel polyamine transport system inhibitor, for its antibacterial potential against MDR pathogens.
  • To evaluate the efficacy, mechanism of action, and resistance potential of AMXT-1501.

Main Methods:

  • Minimum inhibitory concentrations (MICs) were determined for AMXT-1501 against a panel of Gram-positive and Gram-negative MDR bacteria.
  • Comparative efficacy against methicillin-resistant Staphylococcus aureus (MRSA) and CR Escherichia coli was assessed versus vancomycin and tigecycline.
  • Biofilm formation assays were performed at subinhibitory concentrations.
  • Microbial membrane integrity, permeability, and potential were analyzed upon AMXT-1501 exposure.
  • Resistance development was evaluated under sustained exposure.

Main Results:

  • AMXT-1501 demonstrated potent activity against MDR Gram-positive and -negative bacteria, with MIC50/MIC90 values ranging from 3.13–12.5 μM.
  • The compound was more effective against MRSA and CR E. coli than vancomycin and tigecycline, respectively.
  • Subinhibitory concentrations of AMXT-1501 inhibited biofilm formation in S. aureus and Enterococcus faecalis.
  • AMXT-1501 induced microbial membrane damage, increased permeability and membrane potential by targeting cardiolipin and phosphatidylglycerol.
  • No significant resistance was readily induced in tested pathogens.

Conclusions:

  • AMXT-1501 is a promising novel antibacterial agent with broad-spectrum activity against challenging MDR pathogens.
  • Its mechanism involves disruption of microbial membrane integrity and function.
  • The low propensity for resistance development makes AMXT-1501 a valuable candidate for further therapeutic development.
Keywords:
AMXT-1501CRECardiolipinESBLMRSAMultidrug-resistantPhosphatidylglycerol

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