Plasma nitroso compounds are decreased in patients with endothelial dysfunction

Area of Science:

• Cardiovascular Science
• Biochemistry
• Physiology

Background:

• Nitric oxide (NO) plays a systemic role via circulating nitros(yl)ated species (RXNOs).
• RXNOs deliver NO to areas with impaired production, impacting systemic bioactivity.
• Endothelial dysfunction is a key factor in cardiovascular disease development.

Purpose of the Study:

• To investigate the depletion of plasma RXNOs in individuals with cardiovascular risk factors.
• To assess the relationship between RXNO levels and endothelial dysfunction.
• To determine if RXNOs can serve as diagnostic markers for NO bioavailability.

Main Methods:

• Assessed endothelial function using flow-mediated dilation (FMD) in 68 patients with cardiovascular risk factors and 39 controls.
• Measured plasma RXNO concentrations using reductive gas phase chemiluminescence.
• Utilized high-resolution ultrasound for FMD assessment.

Main Results:

• A progressive decrease in FMD was observed with increasing cardiovascular risk factors.
• Plasma RXNO levels significantly decreased with increasing numbers of risk factors (p < 0.01).
• RXNO levels were independently predictive of endothelial function in a multivariate regression model (r = 0.41, p < 0.001).

Conclusions:

• Endothelial dysfunction in patients with cardiovascular risk factors is linked to reduced circulating RXNO levels.
• Plasma RXNOs may serve as valuable diagnostic markers for NO bioavailability and endothelial function.
• Further research is needed to understand the mechanisms behind RXNO decrease and its role in arteriosclerosis.