L‐Arginase induces Vascular Dysfunction in Old Spontaneously Hypertensive Rats

Aging is a major non‐modifiable risk factor for hypertension. Structural, functional and mechanical changes occur with aging. These changes are similar to those seen in hypertension in the vasculature. Also, aging increases the vascular dysfunction that occurs in hypertension. L‐arginase is a ureohydrolase enzyme that converts L‐arginine to L‐ornithine and urea. Arginase action reduces substrate (L‐arginine) availability for the formation of nitric oxide (NO). This reduces the level of NO and leads to reduced vasodilation and ultimately, vascular dysfunction.