Hypothesis: arterial glycocalyx dysfunction is the first step in the atherothrombotic process

Area of Science:

• Cardiovascular Biology
• Biomedical Engineering
• Pathophysiology

Background:

• The glycocalyx, a gel layer lining blood vessels, is crucial for vascular health.
• It is a negatively charged structure rich in anionic sites, including sialic acid and proteoglycans.
• Blood flow shear stress on the glycocalyx stimulates nitric oxide (NO) release, an anti-atherogenic factor.

Purpose of the Study:

• To present evidence that the glycocalyx is the primary defense against atherothrombotic disease.
• To postulate that risk factors impair glycocalyx function, initiating atherothrombosis.
• To propose testing these postulates in an animal model.

Main Methods:

• Review of existing evidence on glycocalyx structure and function.
• Postulation of the glycocalyx's role in atherothrombosis initiation.
• Proposal for validation using a large animal model of shear-stress-mediated arterial dilatation.

Main Results:

• The glycocalyx's role as the first line of defense against atherothrombotic disease is supported by evidence.
• Low shear stress areas are more prone to atheroma due to reduced NO generation.
• Hyperglycemia and oxidized low-density lipoprotein are shown to impair glycocalyx function.

Conclusions:

• The glycocalyx is the initial target of atherothrombotic risk factors.
• Dysfunction of the glycocalyx, particularly from hyperglycemia, is the first step in atherothrombosis for diabetic and metabolic syndrome patients.
• Other risk factors like smoking and hyperlipidemias likely initiate atherothrombosis by damaging the glycocalyx.