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Reduction in soluble guanylyl cyclase-specific activity following prolonged treatment of porcine pulmonary artery with nitric oxide.

Am J Physiol Lung Cell Mol Physiol. 2007 Jul;293(1):L84-95. Epub 2007 Mar 23
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摘要


In a newly characterized cultured porcine pulmonary artery (PA) preparation, 24-h treatment with the nitric oxide (NO) donor (Z)-1-[N-(2-aminoethyl)-N-(2-ammonioethyl)amino]diazen-1-ium-1,2-diolate (DETA-NO) decreased the response to acutely applied DETA-NO compared with 24-h control (-log EC(50) 6.55 +/- 0.12 and 5.02 +/- 0.21, respectively). Treatment of PA with the cell-permeable superoxide dismutase mimetic, Mn(III) tetra(4-benzoic acid) porphyrin chloride, did not change NO responsiveness in either freshly prepared or 24-h DETA-NO-treated PA. cGMP and cAMP phosphodiesterase activities were approximately equal in PA. Twenty-four-hour DETA-NO treatment did not change either cGMP or cAMP phosphodiesterase activities. Twenty-four hours in culture had no significant effect on soluble guanylyl cyclase (sGC) subunit mRNA expression, but 24-h DETA-NO treatment significantly decreased the expression of both sGCalpha(1) and sGCbeta(1). sGCbeta(1) protein expression was 42 +/- 4 ng/mg soluble protein. Twenty-four hours in culture without and with DETA-NO reduced sGCbeta(1) protein expression (36 +/- 3 and 31 +/- 3 ng/mg soluble protein, respectively, P < 0.025). Basal tissue cGMP [(cGMP)(i)] was significantly increased, and NO-induced (cGMP)(i) was significantly decreased by 24-h DETA-NO treatment. (cGMP)(i) normalized to the amount of sGC protein expressed in PA was significantly lower in PA treated for 24 h with DETA-NO compared with both freshly isolated and 24-h cultured PA. We conclude that prolonged NO treatment induces decreased acute NO responsiveness in part by decreasing both sGC expression and sGC-specific activity.

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