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Increased expression of inducible nitric oxide synthase in psoriatic skin and cytokine-stimulated cultured keratinocytes
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences. (Dermatology and Venereology)
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1996 (English)In: British Journal of Dermatology, ISSN 0007-0963, Vol. 134, no 4, 643-648 p.Article in journal (Refereed) Published
Abstract [en]

Since nitric oxide (NO) has been implicated in the pathogenesis of various hyperproliferative and inflammatory diseases, the mRNA expression of constitutive nitric oxide synthase (cNOS) and inducible nitric oxide synthase (iNOS) were investigated in psoriatic skin by reverse transcriptase coupled to the polymerase chain reaction (PCR). The study showed that the mRNA expression of brain nitric oxide synthase (bNOS), one of two isoforms of cNOS, was weak in both psoriatic plaques lesions and uninvolved skin, while mRNA transcripts for the second isoform, endothelial nitric oxide synthase (eNOS), were not detectable using the present method. In contrast, the mRNA expression of iNOS was markedly increased in lesional skin as compared to uninvolved skin. Cultured human keratinocytes exposed to a combination of interleukin-1 beta (IL-1 beta) and tumour necrosis factor-alpha (TNF-alpha) for 4 h, showed strong gene expression of iNOS, while in 24 h, the expression had returned to baseline expression. In summary, the study demonstrates that mRNA for the inducible form of NOS is over-expressed in psoriatic lesions. The cause of this may be the local presence of inflammatory cytokines. These findings imply that iNOS may play an important part in local regulation of NO synthesis in psoriasis and other inflammatory dermatoses.

Place, publisher, year, edition, pages
1996. Vol. 134, no 4, 643-648 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-58875PubMedID: 8733364OAI: oai:DiVA.org:uu-58875DiVA: diva2:86784
Available from: 2008-10-17 Created: 2008-10-17 Last updated: 2009-10-15Bibliographically approved

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