Key Takeaways & Executive Findings
- •• Multidrug-resistant bacteria employ diverse mechanisms including efflux pumps, enzymatic inactivation, and target site modifications. • Horizontal gene transfer, particularly via plasmids and transposons, accelerates the spread of resistance genes among bacterial populations. • Biofilm formation contributes to persistent infections and increased resistance to antimicrobial agents. • Alternative therapeutic approaches, such as phage therapy and antimicrobial peptides, show promise in overcoming resistance.
Abstract
Antimicrobial resistance (AMR) poses a significant global health threat, with multidrug-resistant (MDR) bacteria emerging as a major concern. This review synthesizes recent advances in understanding the mechanisms of AMR, including efflux pumps, enzymatic degradation, target modification, and biofilm formation. We highlight the role of horizontal gene transfer in disseminating resistance genes and discuss the impact of antibiotic overuse in clinical and agricultural settings. The review also examines novel therapeutic strategies, such as phage therapy, antimicrobial peptides, and combination therapies, which offer potential alternatives to conventional antibiotics. By integrating current knowledge, we aim to provide a comprehensive overview that informs future research directions and policy decisions to combat AMR effectively.
1. Introduction
Antimicrobial resistance (AMR) has emerged as one of the most pressing public health challenges of the 21st century. The overuse and misuse of antibiotics in human medicine, veterinary practice, and agriculture have accelerated the evolution and spread of multidrug-resistant (MDR) bacteria. These pathogens, often referred to as 'superbugs', are resistant to multiple classes of antibiotics, rendering standard treatments ineffective and leading to increased morbidity, mortality, and healthcare costs. The World Health Organization has identified AMR as a top global health threat, emphasizing the urgent need for novel therapeutic strategies and robust surveillance systems.
This review aims to provide a comprehensive overview of the current understanding of antimicrobial resistance mechanisms, focusing on multidrug-resistant bacteria. We discuss the molecular basis of resistance, including efflux pumps, enzymatic degradation, target modification, and biofilm formation. Additionally, we explore the role of horizontal gene transfer in the dissemination of resistance genes and examine emerging therapeutic approaches that hold promise in combating MDR infections. By synthesizing recent research findings, we hope to contribute to the development of effective strategies to mitigate the impact of AMR.
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ZHANG Wei, LI Ming, WANG Fang, CHEN Jing (2026). Research Progress on Multidrug-Resistant Bacteria and Antimicrobial Resistance Mechanisms. Chinese Journal of New Drugs. https://doi.org/pub_80__articleID_534
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Frequently Asked Questions
What are the main mechanisms of antimicrobial resistance in multidrug-resistant bacteria?
The main mechanisms include efflux pumps that actively expel antibiotics, enzymatic degradation or modification of drugs, target site mutations, and reduced membrane permeability. Biofilm formation also contributes to resistance by creating a physical barrier and promoting persistent infections.
How does horizontal gene transfer contribute to the spread of antimicrobial resistance?
Horizontal gene transfer allows bacteria to acquire resistance genes from other bacteria through processes such as conjugation, transformation, and transduction. Plasmids and transposons often carry multiple resistance genes, enabling rapid dissemination of multidrug resistance across bacterial populations.
What are the promising alternative therapies for multidrug-resistant infections?
Alternative therapies include phage therapy, which uses bacteriophages to specifically lyse bacteria, antimicrobial peptides that disrupt bacterial membranes, and combination therapies that enhance the efficacy of existing antibiotics. These approaches are being explored to overcome resistance.
Why is biofilm formation important in antimicrobial resistance?
Biofilms are communities of bacteria attached to surfaces and encased in an extracellular matrix. They exhibit increased resistance to antibiotics due to limited penetration, altered metabolic states, and the presence of persister cells, making infections difficult to eradicate.
What is the role of efflux pumps in multidrug resistance?
Efflux pumps are membrane proteins that actively transport antibiotics out of the bacterial cell, reducing intracellular drug concentrations. Overexpression of these pumps can confer resistance to multiple drug classes, contributing to the multidrug-resistant phenotype.
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