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Related Experiment Video

Updated: Sep 30, 2025

Quantitative Polymerase Chain Reaction-based Analyses of Murine Intestinal Microbiota After Oral Antibiotic Treatment
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Antibiotics cause metabolic changes in mice primarily through microbiome modulation rather than behavioral changes.

Kale S Bongers1, Roderick A McDonald1, Katherine M Winner1,2

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Antibiotics profoundly impact metabolism, but their effects on mouse weight loss are primarily due to microbiome modulation, not behavioral changes like food aversion. This research identifies antibiotic strategies that minimize behavioral side effects.

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Area of Science:

  • Microbiology
  • Metabolic Science
  • Pharmacology

Background:

  • The gut microbiome significantly influences host metabolism, but its precise mechanisms are not fully understood.
  • Antibiotics are commonly used to study the microbiome, yet they possess significant off-target effects on behavior and diet.
  • These antibiotic-induced behavioral changes can confound experimental results, limiting their interpretation.

Purpose of the Study:

  • To differentiate the metabolic effects of microbiome modulation from the behavioral side effects of antibiotics.
  • To assess the impact of oral versus intraperitoneal antibiotic administration on mouse metabolism and behavior.
  • To identify antibiotic regimens that effectively alter the gut microbiota with minimal behavioral consequences.

Main Methods:

  • Mice were treated with various oral and intraperitoneal antibiotic regimens.
  • Control groups received bitter compounds or were germ-free.
  • Measurements included body weight, tissue mass (fat, liver, muscle), and food/water consumption.

Main Results:

  • Oral antibiotics led to significant weight loss in multiple tissues and reduced food/water intake.
  • Behavioral effects (food/water aversion) alone did not cause tissue weight loss.
  • Intraperitoneal antibiotics mimicked oral antibiotic effects, and germ-free mice showed no weight loss, indicating microbiome mediation.

Conclusions:

  • Antibiotic-induced metabolic changes, particularly tissue weight loss, are primarily driven by microbiome modulation, not behavioral aversion.
  • Understanding these distinctions is crucial for accurately interpreting microbiome research involving antibiotics.
  • This study highlights the need for careful selection of antibiotic regimens to isolate microbiome effects.