Changes on fecal microbiota in rats exposed to permethrin during postnatal development

Area of Science:

• Environmental toxicology
• Microbiology
• Mammalian gut microbiome research

Background:

• Gut microbiota alterations due to diet and contaminants can lead to diseases.
• Pyrethroid pesticides, like permethrin (PERM), are environmental contaminants often ingested through diet.
• Early-life exposure to environmental factors can have lasting impacts on gut health.

Purpose of the Study:

• To evaluate the effects of low-dose permethrin (PERM) exposure during early life on rat fecal microbiota composition.
• To investigate the impact of PERM on short-chain fatty acid levels.
• To determine the in vitro antimicrobial activity of PERM against various bacterial strains.

Main Methods:

• Long-term (4-month) study involving PERM-treated and control rats.
• Measurement of fecal microbiota composition and short-chain fatty acids.
• In vitro antimicrobial assays to determine Minimal Inhibitory Concentrations (MICs) of PERM.

Main Results:

• PERM-treated rats showed reduced Bacteroides-Prevotella-Porphyromonas species.
• Increased abundance of Enterobacteriaceae and Lactobacillus was observed in PERM-exposed rats.
• Changes in acetic and propionic acid levels were noted; PERM exhibited higher antibacterial activity against beneficial bacteria (e.g., Bifidobacterium, Lactobacillus paracasei) than against tested pathogens (e.g., Staphylococcus aureus, Escherichia coli).

Conclusions:

• Early-life exposure to permethrin can significantly alter the gut microbiota composition.
• PERM's differential antibacterial effects on gut bacteria may disrupt microbial balance.
• These microbiota changes induced by PERM exposure could be a contributing factor to disease development.