Homocysteine and copper interact to promote type 5 phosphodiesterase expression in rabbit cavernosal smooth muscle cells
| Autor: | Raj Persad, Gianni D Angelini, Nick S. Greaves, Matthew Hotston, Jonathon Bloor, Jamie Y. Jeremy, Nilima Shukla |
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| Rok vydání: | 2008 |
| Předmět: |
Male
medicine.medical_specialty Vascular smooth muscle Homocysteine Phosphodiesterase Inhibitors Urology Blotting Western Myocytes Smooth Muscle In Vitro Techniques Gene Expression Regulation Enzymologic Piperazines Sildenafil Citrate Superoxide dismutase chemistry.chemical_compound Internal medicine medicine Animals Sulfones Chelating Agents Cyclic Nucleotide Phosphodiesterases Type 5 biology Superoxide Penicillamine NADPH Oxidases Phosphodiesterase General Medicine Endocrinology chemistry Purines Catalase Data Interpretation Statistical Apocynin cardiovascular system biology.protein Rabbits Reactive Oxygen Species Copper Nicotinamide adenine dinucleotide phosphate Penis |
| Zdroj: | Asian Journal of Andrology. 10:905-913 |
| ISSN: | 1745-7262 1008-682X |
| Popis: | To study the effects of homocysteine and copper on type 5 phosphodiesterase (PDE5) expression in cavernosal vascular smooth muscle cells (CVSMCs) and to investigate superoxide (O(2)(.-)) derived from nicotinamide adenine dinucleotide phosphate oxidase as homocysteine and copper generate O(2)(.-), and O(2)(.-) upregulates PDE5 expression.CVSMCs derived from rabbit penis were incubated with homocysteine or copper chloride with or without superoxide dismutase (SOD), catalase, sildenafil citrate, or apocynin (nicotinamide adenine dinucleotide phosphate inhibitor) for 16 h. The expression of PDE5 and of glyceraldehyde-3-phosphate dehydrogenase (internal standard) was assessed using Western blot analysis. In parallel, O(2)(.-) was measured spectrophotometrically.CuCl(2) alone (up to 10 micromol/L) and homocysteine alone (up to 100 micromol/L) had no effect on O(2)(.-) formation in CVSMCs compared to controls. In combination, however, homocysteine and CuCl(2) markedly increased O(2)(.-) formation, an effect blocked by SOD, catalase, apocynin, and sildenafil (1 micromol/L) when co-incubated over the same time course. PDE5 expression was also significantly increased in CVSMCs incubated with homocysteine and CuCl(2), compared to controls. This effect was also negated by 16-h co-incubation with SOD, catalase, apocynin and sildenafil.This represents a novel pathogenic mechanism underlying ED, and indicates that the therapeutic actions of prolonged sildenafil use are mediated in part through inhibition of this pathway. |
| Databáze: | OpenAIRE |
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