Abstract
The EDRF discovered in 1986 by Furchgott was later identified as NO by Ignarro. NO was a widely noted gas with diverse functions, having arginine (L-Arg) as a substrate for the NO synthase (NOS). L-Arg and L-citrulline (L-Cit) have long been associated with the urea cycle. L-Cit was produced with NO by the reaction of L-Arg and oxygen. It was shown that administration of L-Arg in animals and humans caused vasodilation and anti-arteriosclerosis effects. Despite the arginine paradox ratio of intracellular arginine concentration to the Km value of NOS gaining widespread attention, advanced arteriosclerosis is known to reduce vascular reactivity towards L-Arg. In recent years, the anti-arteriosclerosis and anti-cell aging effects of the reactive substance citrulline (L-Cit) have been studied. L-Cit and L-Arg combination therapy are starting to be considered in various clinical applications as well.
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