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Related Experiment Video

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The ARP 2/3 complex mediates endothelial barrier function and recovery.

Patrick Belvitch1, Mary E Brown1, Brittany N Brinley2

  • 1Division of Pulmonary, Critical Care, Sleep, and Allergy, University of Illinois Hospital and Health Science System, Chicago, IL, USA.

Pulmonary Circulation
|July 7, 2017
PubMed
Summary

The actin related protein 2/3 (Arp 2/3) complex is crucial for maintaining pulmonary endothelial cell barrier integrity. Inhibiting Arp 2/3 impairs barrier function and recovery, impacting acute respiratory distress syndrome pathophysiology.

Keywords:
ARDSArp 2/3cytoskeletal dynamicsendothelial barrier regulationlamellipodia

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Area of Science:

  • Cell Biology
  • Physiology

Background:

  • Pulmonary endothelial cell (EC) barrier dysfunction is central to acute respiratory distress syndrome (ARDS).
  • Cytoskeletal dynamics, particularly actin polymerization, are key to EC barrier integrity.

Purpose of the Study:

  • To investigate the role of the actin related protein 2/3 (Arp 2/3) complex in human pulmonary EC barrier function and recovery.
  • To characterize the impact of Arp 2/3 inhibition on EC barrier integrity, cytoskeletal structures, and lamellipodia formation.

Main Methods:

  • Assessed transendothelial electrical resistance (TER) to measure barrier function.
  • Quantified intercellular gap area using microscopy.
  • Evaluated lamellipodia formation and depth.
  • Utilized the Arp 2/3 inhibitor CK-666.

Main Results:

  • Arp 2/3 inhibition significantly reduced baseline barrier function (TER) and S1P-induced barrier enhancement.
  • Inhibition delayed barrier recovery after thrombin stimulation.
  • Arp 2/3 inhibition led to increased intercellular gap area and reduced lamellipodia formation and depth.

Conclusions:

  • Arp 2/3 complex activity is critical for maintaining pulmonary endothelial barrier integrity.
  • Arp 2/3 regulates EC barrier function through modulation of lamellipodia and intercellular gap closure.
  • Findings highlight Arp 2/3 as a potential therapeutic target in ARDS.