Role of Trace Elements in Antimicrobial Resistance Dynamics

Area of Science:

• Environmental Science
• Microbiology
• Public Health

Background:

• Antimicrobial resistance (AMR) is a significant global threat, exacerbated by agricultural practices.
• Nonantibiotic agents like metals and nanoparticles accumulate in soil and water from fertilizers, pesticides, and waste.
• These pollutants exert selective pressure on microbial communities, driving AMR evolution.

Purpose of the Study:

• To review how agricultural pollutants influence microbial communities and promote the spread of antibiotic resistance genes (ARGs).
• To synthesize the mechanisms by which environmental stressors, including engineered nanoparticles (NPs), contribute to AMR.
• To highlight the need for revised agricultural pollution management strategies.

Main Methods:

• Literature review synthesizing existing research on environmental drivers of AMR in agricultural systems.
• Analysis of mechanisms of horizontal gene transfer (HGT) facilitated by pollutants.
• Examination of the role of nanoparticles (NPs) in promoting AMR.

Main Results:

• Metals (copper, zinc), metalloids (arsenic), and NPs in agricultural environments alter microbial community composition.
• Pollutants enhance horizontal gene transfer (HGT) of antibiotic resistance genes (ARGs) via multiple mechanisms.
• Sub-lethal concentrations of engineered NPs may paradoxically promote nano-resistance and co-select for AMR.

Conclusions:

• Environmental pollution from agricultural practices is a key driver of AMR.
• Urgent re-evaluation of agricultural pollution management, including metal thresholds and nano-agrochemical regulation, is needed.
• Bridging environmental AMR research with sustainable agriculture is essential for mitigation.