Related Experiment Video

Updated: Aug 20, 2026

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat
07:46

Experimental Endocarditis Model of Methicillin Resistant Staphylococcus aureus (MRSA) in Rat

Published on: June 4, 2012

Influence of various antimicrobial agents on the intestinal flora in an intestinal MRSA-carrying rat model

Masahiro Takahata1, Yoko Sugiura, Satoshi Ameyama

  • 1Research Laboratories, Toyama Chemical Co., Ltd., 2-4-1 Shimookui, Toyama 930-8508, Japan. masahiro_takahata@toyama-chemical.co.jp

Journal of Infection and Chemotherapy : Official Journal of the Japan Society of Chemotherapy
|December 23, 2004
PubMed

Insights

Piperacillin (PIPC) and cefazolin (CEZ) did not increase intestinal methicillin-resistant Staphylococcus aureus (MRSA) in rats. Flomoxef (FMOX) and cefmetazole (CMZ) significantly increased MRSA and disrupted gut flora.

Area of Science:

  • Microbiology
  • Pharmacology
  • Gastroenterology

Background:

  • Intestinal microbiota plays a crucial role in maintaining gut health.
  • Antibiotic use can significantly disrupt the delicate balance of the intestinal flora.
  • Methicillin-resistant Staphylococcus aureus (MRSA) colonization poses a significant health risk.

Purpose of the Study:

  • To compare the effects of piperacillin (PIPC), cefazolin (CEZ), cefmetazole (CMZ), and flomoxef (FMOX) on intestinal MRSA colonization and gut microbiota composition.
  • To evaluate the impact of these antibiotics on the recovery of key gut bacteria like Escherichia coli and Bacteroides spp.

Main Methods:

  • Utilized an established rat model carrying methicillin-resistant Staphylococcus aureus (MRSA) in the intestine.
  • Administered different antibiotics (PIPC, CEZ, CMZ, FMOX) and monitored MRSA levels.
  • Assessed the composition and recovery of intestinal flora, including Escherichia coli and Bacteroides spp.

Main Results:

  • PIPC and CEZ did not lead to an increase in intestinal MRSA.
  • FMOX and CMZ significantly increased MRSA colonization (P < 0.01).
  • FMOX and CMZ severely disrupted intestinal flora, delaying the recovery of Escherichia coli and Bacteroides spp., unlike PIPC and CEZ which showed rapid bacterial recovery.

Conclusions:

  • Piperacillin and cefazolin appear to be safer choices regarding MRSA colonization and gut microbiota disruption compared to flomoxef and cefmetazole.
  • The choice of antibiotic can significantly influence the risk of MRSA proliferation and the integrity of the intestinal ecosystem.

More Related Videos

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus08:32

Development and Assessment of Intracellular Infection Models for Staphylococcus aureus

Published on: January 17, 2025

Quantitative Polymerase Chain Reaction-based Analyses of Murine Intestinal Microbiota After Oral Antibiotic Treatment08:33

Quantitative Polymerase Chain Reaction-based Analyses of Murine Intestinal Microbiota After Oral Antibiotic Treatment

Published on: November 17, 2018

Related Concept Videos

Clinical Significance of Antibiotic Resistance01:25

Clinical Significance of Antibiotic Resistance

Methicillin-resistant Staphylococcus aureus (MRSA) presents a critical public health threat, arising from its capacity to resist β-lactam antibiotics due to acquisition of the mecA gene within the staphylococcal cassette chromosome mec (SCCmec). This gene encodes penicillin-binding protein 2a (PBP2a), which impairs binding efficacy of methicillin and other β-lactams. MRSA has evolved into distinct clonal lineages impacting humans and animals alike, reinforcing its significance within the One...
Microbiota Modulation by Antibiotics01:21

Microbiota Modulation by Antibiotics

Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
Mechanism of Antibiotic Resistance in MRSA01:25

Mechanism of Antibiotic Resistance in MRSA

Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...