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Treatment of psoriasis with topical NG-monomethyl-l-arginine, an inhibitor of nitric oxide synthesis

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A double blind left, right comparative study was carried out in 17 psoriatic subjects to examine the influence of a topically applied inhibitor of nitric oxide (NO) synthesis on the pathogenic events of psoriasis. The inhibitor NG-monomethyl-l-arginine (L-NMMA) in aqueous cream BP was applied to one plaque while aqueous cream BP alone served as control. Compared with the control, theL-NMMA-treated side showed significant (77%) inhibition of NO production and a reduction in blood flow, confirming its bioavailability.L-NMMA significantly reduced staining for endothelial cells and intercellular adhesion molecule 1, while CD1a-positive Langerhans cells and CD8-positive suppressor cytotoxic T cells increased. CD4-positive lymphocytes and epidermal proliferation, as indicated by Ki-67 staining, were unaffected by this degree of inhibition of NO synthesis, and correspondingly significant clinical improvement was not found.
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Keywords: Langerhans’ cells; NG-monomethyl-l-arginine; angiogenesis; nitric oxide; psoriasis; suppressor cytotoxic T cells

Document Type: Research Article

Affiliations: Department of Dermatology, Aberdeen Royal Infirmary, Foresterhill, Aberdeen, AB25 2ZN, U.K.

Publication date: May 1, 2000

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