TY - JOUR
T1 - Identification and characterization of potent and selective aquaporin-3 and aquaporin-7 inhibitors
AU - Sonntag, Yonathan
AU - Gena, Patrizia
AU - Maggio, Anna
AU - Singh, Tania
AU - Artner, Isabella
AU - Oklinski, Michal K
AU - Johanson, Urban
AU - Kjellbom, Per
AU - Nieland, John Dirk
AU - Nielsen, Søren
AU - Calamita, Giuseppe
AU - Rützler, Michael
N1 - Published under license by The American Society for Biochemistry and Molecular Biology, Inc.
PY - 2019/5/3
Y1 - 2019/5/3
N2 - The aquaglyceroporins are a subfamily of aquaporins that conduct both water and glycerol. Aquaporin-3 (AQP3) has an important physiological function in renal water reabsorption, and AQP3- mediated hydrogen peroxide (H
2O
2) permeability can enhance cytokine signaling in several cell types. The related aquaglyceroporinAQP7is required for dendritic cell chemokine responses and antigen uptake. Selective small-molecule inhibitors are desirable tools for investigating the biological and pathological roles of these and other AQP isoforms. Here, using a calcein fluorescence quenching assay,wescreened a library of 7360 drug-like small molecules for inhibition of mouse AQP3 water permeability. Hit confirmation and expansion with commercially available substances identified the ortho-chloride-containing compound DFP00173, which inhibitedmouseandhumanAQP3with an IC
50 of ∼0.1-0.4 μM but had low efficacy toward mouse AQP7 and AQP9. Surprisingly, inhibitor specificity testing revealed that the methylurealinked compound Z433927330, a partial AQP3 inhibitor (IC50, ∼0.7-0.9μM), is a potent and efficacious inhibitor of mouseAQP7 water permeability (IC
50, ∼0.2 μM). Stopped-flow light scattering measurements confirmed that DFP00173 and Z433927330 inhibit AQP3 glycerol permeability in human erythrocytes. Moreover, DFP00173, Z433927330, and the previously identified AQP9 inhibitor RF03176 blocked aquaglyceroporin H2O2 permeability. Molecular docking to AQP3, AQP7, and AQP9 homology models suggested interactions between these inhibitors and aquaglyceroporins at similar binding sites. DFP00173 and Z433927330 constitute selective and potent AQP3 and AQP7 inhibitors, respectively, and contribute to a set of isoform-specific aquaglyceroporin inhibitors that will facilitate the evaluation of these AQP isoforms as drug targets.
AB - The aquaglyceroporins are a subfamily of aquaporins that conduct both water and glycerol. Aquaporin-3 (AQP3) has an important physiological function in renal water reabsorption, and AQP3- mediated hydrogen peroxide (H
2O
2) permeability can enhance cytokine signaling in several cell types. The related aquaglyceroporinAQP7is required for dendritic cell chemokine responses and antigen uptake. Selective small-molecule inhibitors are desirable tools for investigating the biological and pathological roles of these and other AQP isoforms. Here, using a calcein fluorescence quenching assay,wescreened a library of 7360 drug-like small molecules for inhibition of mouse AQP3 water permeability. Hit confirmation and expansion with commercially available substances identified the ortho-chloride-containing compound DFP00173, which inhibitedmouseandhumanAQP3with an IC
50 of ∼0.1-0.4 μM but had low efficacy toward mouse AQP7 and AQP9. Surprisingly, inhibitor specificity testing revealed that the methylurealinked compound Z433927330, a partial AQP3 inhibitor (IC50, ∼0.7-0.9μM), is a potent and efficacious inhibitor of mouseAQP7 water permeability (IC
50, ∼0.2 μM). Stopped-flow light scattering measurements confirmed that DFP00173 and Z433927330 inhibit AQP3 glycerol permeability in human erythrocytes. Moreover, DFP00173, Z433927330, and the previously identified AQP9 inhibitor RF03176 blocked aquaglyceroporin H2O2 permeability. Molecular docking to AQP3, AQP7, and AQP9 homology models suggested interactions between these inhibitors and aquaglyceroporins at similar binding sites. DFP00173 and Z433927330 constitute selective and potent AQP3 and AQP7 inhibitors, respectively, and contribute to a set of isoform-specific aquaglyceroporin inhibitors that will facilitate the evaluation of these AQP isoforms as drug targets.
UR - http://www.scopus.com/inward/record.url?scp=85065638439&partnerID=8YFLogxK
U2 - 10.1074/jbc.RA118.006083
DO - 10.1074/jbc.RA118.006083
M3 - Journal article
C2 - 30862673
SN - 1083-351X
VL - 294
SP - 7377
EP - 7387
JO - The Journal of Biological Chemistry
JF - The Journal of Biological Chemistry
IS - 18
ER -