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J Pharm Pharmacol. 2017 Jun;69(6):675-683. doi: 10.1111/jphp.12693. Epub 2017 Feb 17.

Inhibition of PDE5A1 guanosine cyclic monophosphate (cGMP) hydrolysing activity by sildenafil analogues that inhibit cellular cGMP efflux.

Author information

1
Experimental and Clinical Pharmacology, Department of Medical Biology, Faculty of Health Sciences, University of Tromsø - The Arctic University of Norway, Tromsø, Norway.
2
Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California - San Diego, La Jolla, CA, USA.
3
Department of Medicinal Chemistry, Institute of Pharmacology, Polish Academy of Sciences, Kraków, Poland.

Abstract

OBJECTIVES:

To determine the ability of 11 sildenafil analogues to discriminate between cyclic nucleotide phosphodiesterases (cnPDEs) and to characterise their inhibitory potencies (Ki values) of PDE5A1-dependent guanosine cyclic monophosphate (cGMP) hydrolysis.

METHODS:

Sildenafil analogues were identified by virtual ligand screening (VLS) and screened for their ability to inhibit adenosine cyclic monophosphate (cAMP) hydrolysis by PDE1A1, PDE1B1, PDE2A1, PDE3A, PDE10A1 and PDE10A2, and cGMP hydrolysis by PDE5A, PDE6C, PDE9A2 for a low (1 nm) and high concentration (10 μm). Complete IC50 plots for all analogues were performed for PDE5A-dependent cGMP hydrolysis. Docking studies and scoring were made using the ICM molecular modelling software.

KEY FINDINGS:

The analogues in a low concentration showed no or low inhibition of PDE1A1, PDE1B1, PDE2A1, PDE3A, PDE10A1 and PDE10A2. In contrast, PDE5A and PDE6C were markedly inhibited to a similar extent by the analogues in a low concentration, whereas PDE9A2 was much less inhibited. The analogues showed a relative narrow range of Ki values for PDE5A inhibition (1.2-14 nm). The sildenafil molecule was docked in the structure of PDE5A1 co-crystallised with sildenafil. All the analogues had similar binding poses as sildenafil.

CONCLUSIONS:

Sildenafil analogues that inhibit cellular cGMP efflux are potent inhibitors of PDE5A and PDE6C.

KEYWORDS:

PDE5; guanosine cyclic monophosphate; inhibitors; molecular modelling; sildenafil analogues

PMID:
28211580
PMCID:
PMC5434896
DOI:
10.1111/jphp.12693
[Indexed for MEDLINE]
Free PMC Article

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