alexa iNOS gene upregulation is associated with the early proliferative response of human lung fibroblasts to cytokine stimulation.
Immunology

Immunology

Journal of Allergy & Therapy

Author(s): Romanska HM, Polak JM, Coleman RA, James RS, Harmer DW

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Increased release of oxidants has been implicated in the pathogenesis of pulmonary fibrosis. Previous work in the rat showed that formation of the early fibrotic lesion is associated with increased expression of inducible nitric oxide synthase (iNOS) in pulmonary fibroblasts. The aim of this study was to test the hypothesis that NO is involved in the activation of pulmonary fibroblasts. The effects of endogenous and exogenous NO on proliferation of human pulmonary fibroblasts were investigated by administration of cytomix or SNAP, respectively. At low concentrations, both treatments increased cell numbers, an effect attenuated by iNOS inhibitor or NO scavenger. Induction of iNOS was confirmed by measurement of nitrate/nitrite production and by immunodetection. Quantitative RT-PCR showed an increase in iNOS mRNA as early as 3 h after stimulation. These results support the hypothesis and show that upregulation of the iNOS gene is an early event in the proliferative response of human lung fibroblasts to inflammatory stimuli.

This article was published in J Pathol. and referenced in Journal of Allergy & Therapy

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