Protein Information

Name PDE5
Synonyms CGB PDE; CGMP specific phosphodiesterase PDE5A1; CGMP specific phosphodiesterase PDE5A2; CGMP specific phosphodiesterase type 5A; CN5A; PDE 5; PDE5; PDE5A…

Compound Information

Name piperazine
CAS piperazine

Reference List

PubMed Abstract RScore(About this table)
11569531 Walker DK, Beaumont KC, Comby P, Evans KM, Gedge JI, Halliday RC, Roffey SJ, Wright PA: Pharmacokinetics and metabolism of a selective PDE5 inhibitor (UK-343,664) in rat and dog. Xenobiotica. 2001 Aug-Sep;31(8-9):651-64.

The major primary pathways in dog involved piperazine N-deethylation and loss of a two carbon fragment from the piperazine ring (N,N'-de-ethylation).
2(0,0,0,2) Details
17640490 Yoo HH, Kim NS, Im GJ, Kim DH: Pharmacokinetics and tissue distribution of a novel PDE5 inhibitor, SK-3530, in rats. Acta Pharmacol Sin. 2007 Aug;28(8):1247-53.

AIM: To investigate the pharmacokinetic profile and tissue distribution of a novel phosphodiesterase type 5 inhibitor, 5-ethyl-2-{5-[4-(2-hydroxy-ethyl)-piperazine-1-sulfonyl]-2-propoxy-phenyl} -7-propyl-3,5-dihydro-pyrrolo (3,2-d) pyrimidin-4-one (SK-3530), in rats after administration of the (14) C-labeled compound.
1(0,0,0,1) Details
15312980 Corbin JD, Beasley A, Blount MA, Francis SH: Vardenafil: structural basis for higher potency over sildenafil in inhibiting cGMP-specific phosphodiesterase-5 (PDE5). Neurochem Int. 2004 Nov;45(6):859-63.

It is concluded that the methyl/ethyl appended group on the piperazine moiety plays very little role in the difference in potency between sildenafil and vardenafil for inhibiting PDE5, whereas the differences in the ring systems play a critical role in higher potency of vardenafil over sildenafil.
87(1,1,1,7) Details
19635671 Abdulkadir Coban T, Beydemir S, Gucin I, Ekinci D, Innocenti A, Vullo D, Supuran CT: Sildenafil is a strong activator of mammalian carbonic anhydrase isoforms I-XIV. Bioorg Med Chem. 2009 Aug 15;17(16):5791-5. Epub 2009 Jul 17.

Sildenafil citrate, a phosphodiesterase-5 (PDE5) inhibitor widely used for the treatment of erectile dysfunction was investigated for its interaction with the zinc-enzyme carbonic anhydrase (CA, EC 4.2.1.1), as it has in its molecule a piperazine moiety also found in some CA activators (CAAs).
31(0,1,1,1) Details
16759100 Allerton CM, Barber CG, Beaumont KC, Brown DG, Cole SM, Ellis D, Lane CA, Maw GN, Mount NM, Rawson DJ, Robinson CM, Street SD, Summerhill NW: A novel series of potent and selective PDE5 inhibitors with potential for high and dose-independent oral bioavailability. J Med Chem. 2006 Jun 15;49(12):3581-94.

This goal was achieved through identification of a lower clearance series with a high absorption profile, by replacing the 5'-piperazine sulfonamide in the sildenafil template with a 5'-methyl ketone.
3(0,0,0,3) Details
15452190 Gardiner SM, March JE, Kemp PA, Ballard SA, Hawkeswood E, Hughes B, Bennett T: Hemodynamic effects of phosphodiesterase 5 and angiotensin-converting enzyme inhibition alone or in combination in conscious SHR. J Pharmacol Exp Ther. 2005 Jan;312(1):265-71. Epub 2004 Sep 27.


The regional hemodynamic responses to continuous 4-day infusion of UK-357,903 [1-ethyl-4-{3-[3-ethyl-6,7-dihydro-7-oxo-2-(2-pyridylmethyl)-2H-pyrazolo [4 ,3-d] pyrimidin-5-yl]-2-(2-methoxyethoxy)-5-pyridylsulphonyl}piperazine] (266 microg kg (-1) h (-1)) alone and in combination with a low dose of enalapril (10 microg kg (-1) h (-1)) were measured in conscious spontaneously hypertensive rats to test the hypothesis that the renin-angiotensin system may influence the cardiovascular consequences of inhibition of phosphodiesterase 5 (PDE5) by UK-357,903 or vice versa.
2(0,0,0,2) Details