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Transendothelial migration: unifying principles from the endothelial perspective.

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Endothelial cells guide polymorphonuclear leukocyte (PMN) transmigration via adhesion and signaling. Key molecules like PECAM and CD99 orchestrate this process, involving membrane recruitment and junctional protein dynamics.

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Area of Science:

  • Immunology
  • Cell Biology
  • Vascular Biology

Background:

  • Transendothelial migration (TEM) is crucial for leukocyte function.
  • Endothelial cells play a dynamic role in regulating TEM.
  • Specific molecular interactions govern leukocyte passage through the endothelium.

Purpose of the Study:

  • To elucidate the specific contributions of endothelial cells to TEM.
  • To detail the molecular mechanisms underlying PMN transmigration.
  • To explore the roles of PECAM, VE-cadherin, and CD99 in TEM.

Main Methods:

  • Focus on endothelial cell contributions to TEM.
  • Analysis of molecular interactions during transmigration.
  • Investigation of signaling pathways involving calcium ions, LBRC, and CD99.

Main Results:

  • PECAM-mediated interactions initiate TEM, causing calcium ion elevation and LBRC recruitment.
  • VE-cadherin displacement and LBRC targeting are critical for TEM.
  • CD99 signaling activates PKA, driving LBRC recycling for TEM completion.
  • Both paracellular and transcellular TEM pathways utilize similar molecular machinery.

Conclusions:

  • Endothelial cells actively orchestrate TEM through coordinated molecular events.
  • Targeted membrane recruitment and junctional protein regulation are essential for leukocyte diapedesis.
  • Distinct molecular pairs mediate sequential steps in the TEM process.