Abstract：
:Human, dog and rabbit corpus cavernosum type 5 phosphodiesterases (PDE5) were isolated and their characteristics were compared. The three enzymes showed Km values of 0.8, 2.1 and 2.3 uM, respectively. They exhibited similar pH-dependence with optimal pH being 7.5. They required Mg++ for activity and the activity was suppressed by high concentrations of Zn++ (0.1-1 mM). Sildenafil potently inhibited the three enzymes with IC50 values of 3.6, 1.7 and 3.0 nM, respectively. Dipyridamole and IBMX (3-isobutyl-1-methylxanthine) each also inhibited the three enzymes with similar, albeit lower, potencies (IC50 about 1.1 and 5.7 uM, respectively). However, zaprinast exhibited a significantly higher potency against the rabbit enzyme (IC50 53 nM) than against the human and dog PDE5s (IC5s 332 and 217 nM, respectively). Thus, the corpus cavernosum PDE5s are very similar among the various species with the only significant difference being their sensitivity to zaprinast. Human platelet PDE5 was also characterized by comparison with the corpus cavernosum enzyme. The platelet enzyme exhibited a Km, pH-, Mg++- and Zn++-dependence, and sensitivity to sildenafil and zaprinast very similar to those of the corpus cavernosum PDE5. However, compared with corpus cavernosum PDE5, the platelet enzyme exhibited higher sensitivity to dipyridamole and IBMX (IC50 0.46 and 1.8 uM, respectively). This study shows that despite similar kinetics and enzymatic properties, corpus cavernosum PDE5s from different species, and corpus cavernosum and platelet PDE5s, can have differential sensitivity to pharmacological inhibitors.
journal_name
Life Scijournal_title
Life sciencesauthors
Wang P,Wu P,Myers JG,Stamford A,Egan RW,Billah MMdoi
10.1016/s0024-3205(01)00989-4subject
Has Abstractpub_date
2001-03-16 00:00:00pages
1977-87issue
17eissn
0024-3205issn
1879-0631pii
S0024320501009894journal_volume
68pub_type
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