title: Structure -activity relationships of PDE5 inhibitors.
abstract: cGMP has a short-term effect on smooth muscle tone and a longer-term effect on responses to chronic drug treatment or proliferative signals. cGMP-Phosphodiesterase type 5 (PDE5) hydrolizes cGMP, and the result is smooth muscle contraction. PDE5 is a relatively novel therapeutic target of various diseases, such as erectile dysfunction and pulmonary hypertension. The most intensively examined and marketed PDE5 inhibitor was sildenafil (Viagra) but recently vardenafil (Levitra) and tadalafil (Cialis) were launched with beneficial ADME parameters and PDE5 selectivity. The increasing interest in PDE5 inhibition made it reasonable to collect the available inhibitory data from the scientific literature and set up a structure-activity relationship study. Chemical structures of 438 compounds and their cGMP-PDE5 inhibitory data (IC50) were collected from recently published articles. In this paper physiology, regulation and inhibition of PDE5 (and briefly other PDE-s) are discussed and inhibitors are tabulated by the core structures. Finally, a general QSAR model built from these data is presented. All data used in the QSAR study were summarized in a Supplement (for description please see the online version of the article).
authors.affiliation: Vichem Chemie Ltd., Herman Ottó u. 15., Budapest, 1022, Hungary.
authors.forename: D
authors.initials: D
authors.lastname: Eros
authors.forename: Cs
authors.initials: C
authors.lastname: Szántai-Kis
authors.forename: R
authors.initials: R
authors.lastname: Kiss
authors.forename: Gy
authors.initials: G
authors.lastname: Kéri
authors.forename: B
authors.initials: B
authors.lastname: Hegymegi-Barakonyi
authors.forename: I
authors.initials: I
authors.lastname: Kövesdi
authors.forename: L
authors.initials: L
authors.lastname: Orfi
mesh_terms: D002384:Catalysis; D054706:Cyclic Nucleotide Phosphodiesterases, Type 5 / Q000145:classification / Q000378:metabolism; D006801:Humans; D008954:Models, Biological; D058986:Phosphodiesterase 5 Inhibitors; D010726:Phosphodiesterase Inhibitors / Q000737:chemistry* / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D058986:Phosphodiesterase 5 Inhibitors; D010726:Phosphodiesterase Inhibitors; D054706:Cyclic Nucleotide Phosphodiesterases, Type 5