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Related Experiment Video

Updated: Sep 27, 2025

Pneumococcus Infection of Primary Human Endothelial Cells in Constant Flow
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Streptococcus pneumoniae Affects Endothelial Cell Migration in Microfluidic Circulation.

Anna Kopenhagen1, Isabell Ramming1,2, Belinda Camp1,3

  • 1Institut für Mikrobiologie, Technische Universität Braunschweig, Braunschweig, Germany.

Frontiers in Microbiology
|April 11, 2022
PubMed
Summary

Streptococcus pneumoniae infections damage the vascular endothelial barrier. This study developed a novel assay to show how bacteria and pneumolysin impede endothelial wound healing, even under flow conditions.

Keywords:
Streptococcus pneumoniaecell migrationendotheliummicrofluidicpneumolysinwound healing

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Area of Science:

  • Vascular Biology
  • Microbiology
  • Cellular Immunology

Background:

  • Bloodstream infections by Streptococcus pneumoniae trigger inflammation and affect the endothelial barrier.
  • Pneumolysin, a bacterial toxin, increases endothelial permeability, leading to cell damage and apoptosis.
  • Severe consequences include disseminated intravascular coagulation and hypotension.

Purpose of the Study:

  • To investigate the role of pneumolysin in endothelial damage and vascular barrier leakage.
  • To establish and utilize a novel assay for studying endothelial wound healing during pneumococcal infection.

Main Methods:

  • Development of a chamber-separation cell migration assay (CSMA) to create a defined endothelial cell-free gap.
  • Live cell monitoring and confocal microscopy to quantify cell migration, proliferation, and gap closure.
  • Integration of a microfluidic pump system to simulate vascular shear stress and blood flow conditions.

Main Results:

  • Wild-type pneumococci significantly inhibited endothelial gap closure in static and flow conditions.
  • Pneumolysin-deficient pneumococci also significantly retarded cell migration, indicating other bacterial factors are involved.
  • The CSMA system successfully visualized and monitored endothelial barrier integrity under simulated physiological flow.

Conclusions:

  • Pneumococcal infection impairs endothelial wound healing through mechanisms beyond pneumolysin.
  • The developed CSMA with flow simulation provides a robust in vitro model for studying vascular barrier dynamics.
  • This system offers new insights into the effects of pneumococcal infections on endothelial barrier integrity in a dynamic vascular environment.