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It has been suggested that the rat is relatively more susceptible to toxicity induced by inhibitors for type 4 cAMP-specific phosphodiesterase (PDE4). In this study designed to elucidate possible biochemical basis for the higher susceptibility, we compared PDE4 expression levels and their functional relevance among rats, monkeys and humans. In several toxicologically relevant tissues and blood leukocytes,...
Human photoreceptor cGMP-phosphodiesterases (PDE6s) are important reagents in PDE inhibitor discovery. However, recombinant human PDE6s have not been expressed, and isolation of native human PDE6s is highly difficult. In this study, the catalytic subunit(s) of human rod and cone PDE6s (PDE6αβ and PDE6α', respectively) were co-expressed or expressed separately as catalytically active enzymes. Sildenafil...
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