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Related Experiment Videos

Endothelial cell activation by leukocyte microparticles

M Mesri1, D C Altieri

  • 1Department of Pathology, Boyer Center for Molecular Medicine, Yale University School of Medicine, New Haven, CT 06536, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|October 21, 1998
PubMed
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Stimulated polymorphonuclear leukocytes (PMNs) release microparticles that activate endothelial cells (ECs), inducing cytokine gene expression. These PMN-derived microparticles are key inflammatory mediators.

Area of Science:

  • Immunology
  • Cell Biology
  • Inflammation Research

Background:

  • Polymorphonuclear leukocytes (PMNs) play a critical role in inflammatory responses.
  • Endothelial cell (EC) activation is a key event in inflammation and vascular disease.
  • The precise mechanisms by which PMNs modulate EC activation are not fully understood.

Purpose of the Study:

  • To investigate the role of PMNs in modulating endothelial cell activation.
  • To identify the mediators released by PMNs responsible for EC activation.
  • To characterize the nature and function of PMN-derived inflammatory mediators.

Main Methods:

  • Co-culture of human umbilical vein endothelial cells (HUVECs) with PMNs.
  • Measurement of cytokine release (IL-6, IL-8, TNF-alpha, IL-1beta) and mRNA expression.

Related Experiment Videos

  • Use of neutralizing antibodies, physical segregation, and cell-free supernatants.
  • Analysis of PMN-derived microparticles using flow cytometry and SDS-PAGE.
  • Stimulation of PMNs with inflammatory agents (formyl peptide, phorbol ester).

    • Main Results:

    • PMN-EC co-culture significantly increased IL-6 and IL-8 release from HUVECs.
    • PMN cell-free supernatants induced EC activation and IL-6 mRNA upregulation.
    • PMNs released membrane microparticles containing various proteins, enhanced by inflammatory stimuli.
    • Purified PMN microparticles mimicked the effects of PMN supernatant on EC IL-6 release.

    Conclusions:

    • Stimulated PMNs release membrane microparticles that act as potent inflammatory mediators.
    • These PMN-derived microparticles are responsible for endothelial cell activation and cytokine gene induction.
    • PMN microparticles represent a novel target for therapeutic intervention in inflammatory conditions.