Inhibition of human microsomal epoxide hydrolase using PHOME as substrate assessed as formation of 6-methoxy-2-naphthaldehyde incubated for 10 mins prior to substrate addition measured with in 30 mins by fluorescence assay
Activity Assay: The invention also provide methods for assaying for epoxide hydrolase activity as diagnostic assay to identify individuals at increased risk for hypertension and/or those that would benefit from the therapeutic methods of the invention. Any of a number of standard assays for determining epoxide hydrolase activity can be used. For example, suitable assays are described in Gill, et al., Anal Biochem 131, 273-282 (1983); and Borhan, et al., Analytical Biochemistry 231, 188-200 (1995)). Suitable in vitro assays are described in Zeldin et al. J Biol. Chem. 268:6402-6407 (1993). Suitable in vivo assays are described in Zeldin et al. Arch Biochem Biophys 330:87-96 (1996). Assays for epoxide hydrolase using both putative natural substrates and surrogate substrates have been reviewed (see, Hammock, et al. In: Methods in Enzymology, Volume III, Steroids and Isoprenoids, Part B, (Law, J. H. and H. C. Rilling, eds. 1985), Academic Press, Orlando, Fla., pp. 303-311).
Inhibition of microsomal epoxide hydrolase in pooled human liver microsomes assessed as enzyme activity using styrene oxide as substrate at 10 uM incubated for 10 mins by UV-HPLC analysis relative to control
Inhibition of recombinant human mEH expressed in baculovirus expression system assessed as formation of 6-methoxy-2-naphthaldehyde preincubated for 5 mins followed by addition of CMNGC as substrate by fluorescent-based assay
Drug metabolism in human liver microsomes assessed as mEH-mediated oxidoreductive ring-opening of azetidine by measuring [3-[4-[[[3-(hydroxymethyl)oxetan-3-yl]methylamino]methyl]phenoxy]azetidin-1-yl]-[5-(4-methoxyphenyl)-1,3,4-oxadiazol-2-yl]methanone formation by UPLC-Q-TOF/MS analysis
Drug metabolism in human liver microsomes assessed as mEH-mediated hydrolytic ring-opening of oxetane by measuring [3-[4-[[3,3-bis(hydroxymethyl)azetidin-1-yl]methyl]phenoxy]azetidin-1-yl]-[5-(4-methoxyphenyl)-1,3,4-oxadiazol-2-yl]methanone formation by UPLC-Q-TOF/MS analysis
Substrate activity at mEH in human liver microsomes assessed as diol release at 10 uM measured after 60 mins in presence of NADPH by UPLC-Q-TOF/MS analysis
Substrate activity at mEH in human liver microsomes assessed as diol release at 10 uM measured after 60 mins in absence of NADPH by UPLC-Q-TOF/MS analysis
Substrate activity at mEH in human liver microsomes assessed as amino alcohol release at 10 uM measured after 60 mins in presence of NADPH by UPLC-Q-TOF/MS analysis
Substrate activity at mEH in human liver microsomes assessed as diol release at 10 uM measured after 60 mins in presence of CYP inhibitor ketoconazole by UPLC-Q-TOF/MS analysis
Substrate activity at mEH in human liver microsomes assessed as diol release at 10 uM measured after 60 mins in presence of mEH inhibitor-valpromide by UPLC-Q-TOF/MS analysis