Nitric Oxide Supplementation in Argininosuccinic Aciduria

The investigators will perform a double blind, randomized, placebo-controlled, crossover study of NO supplementation in ASA patients assessing endothelial function and blood pressure as primary endpoints, and markers of nitric oxide production as exploratory endpoints. Subjects will receive a nitrite-restricted diet prior to the start and during the trial period. The dietary protein prescriptions will not be altered. After screening, informed consent, subjects will undergo study procedures at the Clinical Research Center (CRC) at Texas Children's Hospital, Houston, TX. Safety laboratories will be performed. Fibroblast and lymphoblast cultures will be established for subsequent studies.A baseline assessment of the vascular endothelial NO production and function will be assessed using FMD of brachial artery using standard techniques (1). Subjects will be randomized to receive either dietary nitric oxide supplement or placebo for 2 weeks, and then crossed-over to receive the other treatment for two weeks. The Investigational Pharmacy Services at Texas Children's Hospital will assign the initial treatment group randomly in a 1:1 ratio using established randomization procedures. Following randomization, subjects will be receive either Neo40® 40 mg/kg/day in two divided doses) or placebo for 14 days. This dose is the dietary supplemental dose and was well-tolerated in the investigators proof of concept treatment subject as well as other clinical studies in cardiovascular disease. Subjects will return on day 14 to the CRC where they will undergo assessment of FMD of the brachial artery, repeated BP measurements, and assay of NO status. The subjects will then be crossed over to receive the alternative treatment and the study procedures will be repeated in identical fashion to the initial arm.