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VEGF-C mediates cyclic pressure-induced endothelial cell proliferation
Hainsworth Y Shin1, Michael L Smith, Karen J Toy
1Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
Physiological Genomics
|October 22, 2002
Summary
Mechanical forces regulate endothelial cell gene transcription. Cyclic pressure specifically alters genes involved in cell function and proliferation, with VEGF-C playing a key role in HUVEC response.
Area of Science:
- Endothelial cell biology
- Mechanobiology
- Molecular biology
Background:
- Mechanical forces, such as pressure, significantly influence endothelial cell functions.
- Gene transcription is a key mechanism through which these forces exert their effects.
- Understanding cellular responses to mechanical stimuli is crucial for cardiovascular research.
Purpose of the Study:
- To identify genes and molecular mechanisms involved in endothelial cell responses to cyclic pressure.
- To compare gene transcription in human umbilical vein endothelial cells (HUVEC) under static vs. dynamic pressure conditions.
- To investigate the role of specific pressure-sensitive genes in endothelial cell function.
Main Methods:
- Utilized Affymetrix GeneChip microarrays to analyze gene transcription.
- Exposed HUVEC to controlled static pressure (0.15 mmHg) and dynamic sinusoidal pressure (60/20 mmHg at 1 Hz).
- Quantified and compared transcriptional profiles between the two pressure conditions.
Main Results:
- Cyclic pressure selectively altered the transcription of 14 genes.
- Affected genes included those involved in hemostasis (tissue plasminogen activator), cell adhesion (integrin-alpha2), and cell signaling (Rho B, cytosolic phospholipase A2).
- Vascular Endothelial Growth Factor (VEGF)-C and Transforming Growth Factor (TGF)-beta2 were identified as uniquely pressure-sensitive genes, with VEGF-C being highly induced and mediating HUVEC proliferation.
Conclusions:
- Cyclic pressure acts as a mechanical force that modulates endothelial cell functions, including proliferation.
- This modulation occurs through the activation of a specific transcriptional program.
- VEGF-C is a critical mediator of HUVEC proliferation in response to cyclic pressure.