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On-Chip Endothelial Inflammatory Phenotyping
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HA and HS Changes in Endothelial Inflammatory Activation.

Elena Caravà1,2, Paola Moretto2, Ilaria Caon2

  • 1Quantix Italia S.r.l., 20121 Milano, Italy.

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|June 2, 2021
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Summary
This summary is machine-generated.

Inflammation, induced by tumor necrosis factor-alpha (TNF-α), significantly alters the extracellular matrix in endothelial cells. This change impacts vessel permeability but does not affect cell behavior or blood cell interactions, suggesting a complex role in vascular disease onset.

Keywords:
Syndecansheparan sulfateinflammation

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Area of Science:

  • Cardiovascular Biology
  • Cellular Inflammation
  • Extracellular Matrix Dynamics

Background:

  • Cardiovascular diseases (CVDs) stem from risk factors like obesity and physical inactivity, altering vessel matrix and blood flow, often alongside inflammation.
  • The precise role of inflammation—whether permissive or consequent—in the onset of vascular disease remains unclear.
  • Elevated levels of tumor necrosis factor-alpha (TNF-α), a cytokine linked to cardiometabolic diseases, are observed in obese patients.

Purpose of the Study:

  • To investigate the effect of inflammation on the initiation of vascular disease.
  • To examine how the cytokine TNF-α influences endothelial cells and the extracellular matrix.

Main Methods:

  • Endothelial cells were treated with the cytokine TNF-α to simulate inflammation.
  • Changes in the extracellular matrix composition, including pericellular hyaluronan and heparan sulfate Syndecans, were analyzed.
  • Cell proliferation, migration, and blood cell recruitment/activation were assessed.

Main Results:

  • TNF-α-induced inflammation caused significant alterations in the endothelial extracellular matrix.
  • Specifically, pericellular hyaluronan increased, and heparan sulfate Syndecan expression was modified.
  • These matrix changes appeared related to endothelial layer permeability but did not influence cell proliferation, migration, or blood cell activation/recruitment.

Conclusions:

  • Inflammation, triggered by TNF-α, profoundly modifies the endothelial extracellular matrix.
  • The observed matrix alterations may impact vascular permeability.
  • Inflammation, under these conditions, does not directly drive key cellular events like proliferation, migration, or blood cell activation relevant to vascular disease progression.