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An agent-based model of vibration-induced intimal hyperplasia
Maha Reda1,2, Christophe Noël3, Nicla Settembre4
1Electromagnetism, Vibration, Optics Laboratory, Institut national de recherche et de sécurité (INRS), Vandœuvre-lès-Nancy, France.
Biomechanics and Modeling in Mechanobiology
|July 19, 2022
Summary
Chronic exposure to hand-arm transmitted vibrations (HAVs) can cause arterial stenosis by decreasing wall shear stress (WSS). An agent-based model simulated this, predicting 30% stenosis after 10 years, highlighting key cellular mechanisms.
Area of Science:
- Biomedical Engineering
- Computational Biology
- Cardiovascular Physiology
Background:
- Hand-arm transmitted vibrations (HAVs) can alter endothelial wall shear stress (WSS).
- Chronic WSS changes may induce intimal hyperplasia, leading to arterial remodeling.
- Understanding vibration-induced vascular changes is crucial for occupational health.
Purpose of the Study:
- To develop and validate an agent-based model (ABM) of vibration-induced intimal hyperplasia.
- To investigate the hemodynamic and cellular mechanisms underlying vibration-induced arterial remodeling.
- To quantify the extent of stenosis resulting from chronic WSS reduction.
Main Methods:
- Implementation of an agent-based model (ABM) integrating hemodynamics and cellular mechanoregulation.
- Flow loop experiments to study WSS-modulated platelet-derived growth factor BB (PDGF-BB) secretion.
- Calibration of ABM parameters using experimental data and literature.
Main Results:
- The ABM successfully replicated basal arterial conditions and predicted a 30% stenosis after 10 years of simulated vibration exposure (chronic WSS drop).
- PDGF-BB migration and TGF-β mitogenic effects on smooth muscle cells significantly influenced stenosis magnitude.
- Reduced circumferential stress from arterial thickening contributed to extracellular matrix degradation.
Conclusions:
- The developed ABM provides a valuable tool for studying vibration-induced intimal hyperplasia.
- Hemodynamic forces and cellular responses, particularly PDGF-BB and TGF-β, are critical in vibration-induced vascular remodeling.
- Arterial thickening and subsequent stress reduction play a role in extracellular matrix degradation.
