Molecular mechanisms responsible for the atheroprotective effects of laminar shear stress.
Level 5 - mechanism / opinion, no new human data
Narrative review of biological and physiological mechanisms without primary empirical data.
PubMed 19309258 · doi:10.1089/ars.2009.2487
What was done
This review summarizes the biological and molecular mechanisms through which hemodynamic shear stress regulates endothelial cell structure, phenotype, and function in the cardiovascular system.
What was found
The abstract describes mechanistic pathways and reports no quantitative data or effect estimates. Disturbed, low, or oscillatory shear stress localized at arterial bifurcations, curvatures, and narrowings alters endothelial function to favor atherosclerotic lesion development. In contrast, high laminar shear stress triggers signaling cascades and gene expression programs that release vasoactive molecules including nitric oxide and prostacyclin, lower vascular permeability to plasma lipoproteins, reduce leukocyte adhesion, and inhibit smooth muscle cell proliferation and migration.
Why it matters
The review outlines the physical and molecular basis for why specific vascular geometries are susceptible to plaque formation while uniform laminar blood flow preserves endothelial integrity and vascular homeostasis.
Limits
The abstract is purely narrative, presenting no quantitative metrics, statistical analyses, systematic search methodology, or direct clinical outcome data in humans. Findings reflect bench-level mechanobiology and physiology rather than clinical trial endpoints.
Cited by
- supports Vascular shear stress causes endothelial cells to secrete nitric oxide and prostacyclin, promoting vasodilation.