The Complex Relationship Between Serum Uric Acid, Endothelial Function and Small Vessel Remodeling in Humans

Area of Science:

• Cardiovascular Research
• Nephrology
• Hypertension

Background:

• The link between serum uric acid (SUA) and human microvascular remodeling is understudied.
• Microvascular remodeling is a key factor in cardiovascular disease progression.

Purpose of the Study:

• To determine if SUA offers additional insight into microvascular remodeling severity compared to the European Heart Score (HS).
• To investigate patterns of microvascular remodeling associated with SUA levels.
• To examine the mediating roles of endothelial function and nitric oxide (NO) availability.

Main Methods:

• Analysis of 162 patients from the Italian Society of Hypertension microvascular dataset.
• Assessment of SUA, media-to-lumen (M/L) ratio, media cross-sectional area (MCSA), endothelial function, NO availability, and HS.
• Definition of severe microvascular remodeling based on top tertiles of M/L ratio and MCSA.

Main Results:

• A U-shaped association was found between SUA and M/L ratio/MCSA, independent of HS.
• SUA reclassified subjects regarding severe microvascular remodeling.
• Hypertrophic remodeling patterns were associated with SUA.
• SUA showed an inverse relationship with endothelial function and NO availability.
• Mediation analysis indicated endothelial function and NO availability link SUA to microvascular remodeling.

Conclusions:

• Incorporating SUA into the HS enhances the identification of individuals with significant microvascular remodeling.
• Endothelial dysfunction and reduced NO availability mediate the association between SUA and microvascular remodeling.