The clinical effects of l-arginine and asymmetric dimethylarginine: implications for treatment in secondary Raynaud's phenomenon

Journal of the European Academy of Dermatology and Venereology : JEADV
P CurtissA G Franks

Abstract

Secondary Raynaud's phenomenon (RP) is often the sentinel clinical finding in systemic sclerosis and may precede systemic disease by several years. Altered nitric oxide metabolism plays a critical role in both fibrosis and severe secondary RP phenotypes in these patients. Increased flux through inducible nitric oxide synthase (iNOS) drives cutaneous fibrosis. Failure of flux through endothelial nitric oxide synthase (eNOS) contributes to increased vasoconstriction and decreased vasorelaxation. The underproduction of nitric oxide by eNOS is in part due to increased levels of asymmetric dimethylarginine (ADMA), an endogenous competitive inhibitor of nitric oxide synthase. The inhibitory effects of increased ADMA levels may be counteracted increasing serum l-arginine, which is often an effective treatment strategy in these patients. As such, l-arginine-based therapies should be considered in managing secondary RP, particularly given their favourable safety and tolerability profile. While there is no established dosing regimen, studies of oral l-arginine in secondary RP suggest that divided dosing may begin at 1-2 g/day and may be titrated up to 10 g/day. Conversely, primary RP is not associated with increased ADMA production which...Continue Reading

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Citations

Aug 23, 2021·Current Opinion in Rheumatology·Ariane L Herrick

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