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Related Concept Videos

Endocarditis I: Introduction01:25

Endocarditis I: Introduction

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Introduction:Endocarditis is the infection of the endocardium, the inner lining of the heart and its valves. When the heart muscle is involved, the condition is termed myocarditis, while an infection of the outer lining is called pericarditis. Infective endocarditis (IE) primarily affects the endocardium, where pathogens adhere to the valves or lining, forming vegetation that can lead to severe complications. Infective endocarditis occurs when microorganisms, usually bacteria from other body...
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Novel human in vitro vegetation simulation model for infective endocarditis.

Franziska A Schwartz1, Lars Christophersen1, Anne Sofie Laulund1

  • 1Department of Clinical Microbiology, Rigshospitalet, Copenhagen N, Denmark.

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Summary

Researchers developed a novel in vitro model simulating infective endocarditis (IE) vegetations. This organoid-like model allows for rapid screening of new antibiotic treatments against key IE pathogens like Staphylococcus aureus.

Keywords:
Biofilmantibiotic tolerancehistopathologyhost responseinfective endocarditisorganoid-like simulation

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Area of Science:

  • Cardiovascular Medicine
  • Microbiology
  • Medical Technology

Background:

  • Infective endocarditis (IE) is a severe heart valve infection with high mortality rates.
  • Developing effective treatments is challenging due to the lack of rapid preclinical models.
  • IE vegetations form on heart valves from platelets, leukocytes, and fibrin, becoming susceptible to bacterial colonization.

Purpose of the Study:

  • To establish a novel in vitro simulation model of infective endocarditis vegetations.
  • To enable rapid screening of potential new treatment strategies for IE.
  • To investigate bacterial colonization and antibiotic tolerance within the simulated vegetation environment.

Main Methods:

  • A platelet and leucocyte-rich fibrin patch was utilized to create an organoid-like IE model.
  • The model was colonized with common IE-associated bacteria: Staphylococcus aureus, Streptococcus spp. (S. mitis group), and Enterococcus faecalis.
  • Bacterial colonization and antibiotic efficacy (tobramycin, ciprofloxacin, penicillin) were assessed using microscopy and quantitative bacteriology.

Main Results:

  • Stable bacterial colonization was achieved on the fibrin patch, mimicking clinical IE vegetations.
  • Microscopy showed uneven, biofilm-like bacterial growth on the patch surface.
  • Bacteria within the simulated vegetation exhibited increased tolerance to antibiotics compared to planktonic bacteria.

Conclusions:

  • A functional in vitro IE vegetation simulation model was successfully established using relevant pathogens.
  • The model accurately reflects key aspects of the natural IE process, including biofilm formation and antibiotic tolerance.
  • This novel model holds significant potential for the rapid and efficient screening of novel IE therapeutic candidates.