Homoarginine, cardiovascular risk, and mortality

Area of Science:

• Cardiovascular Medicine
• Biochemistry
• Nephrology

Background:

• Homoarginine, an amino acid derivative, may influence nitric oxide availability and endothelial function.
• The impact of homoarginine levels on cardiovascular outcomes and mortality remains largely unknown.

Purpose of the Study:

• To investigate the association between homoarginine levels and cardiovascular and all-cause mortality.
• To explore the relationship between homoarginine, kidney function, and endothelial dysfunction markers.

Main Methods:

• Assessed mortality risk based on homoarginine levels in two cohorts: 3,305 patients from the LURIC study (coronary angiography) and 1,244 patients from the 4D study (hemodialysis).
• Analyzed associations with estimated glomerular filtration rate and adhesion molecules (ICAM-1, VCAM-1).

Main Results:

• In the LURIC study, the lowest quartile of homoarginine (<1.85 µmol/L) showed a >4-fold higher cardiovascular mortality rate compared to the highest quartile (>3.1 µmol/L).
• Lower homoarginine levels correlated with impaired kidney function and higher levels of endothelial dysfunction markers.
• Hemodialysis patients (4D study) with lower mean homoarginine levels (<0.87 µmol/L) exhibited a 2-fold increased mortality risk compared to those with higher levels (>1.4 µmol/L).

Conclusions:

• Homoarginine levels are independently associated with cardiovascular and all-cause mortality in patients undergoing coronary angiography and hemodialysis.
• Further research is required to understand the underlying mechanisms linking homoarginine to mortality.