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Novel (19) F-MRS β-galactosidase reporter molecules incorporated nitrogen mustard analogues.
Chemical Biology & Drug Design 2017 November
In this study, we propose a novel molecular platform-integrated fluorinated antitumor nitrogen mustards for (19) F-MRS assay of β-galactosidase (β-gal) activity. Following this idea, we have designed, synthesized, and characterized 2-fluoro-4-[bis(2'-chloroethyl)amino]phenyl β-D-galactopyranoside 5, 2-fluoro-4-{bis[2'-O-(β-D-galactopyranosyl)ethyl]amino}phenyl β-D-galactopyranoside 8, 2-fluoro-4-{bis[[1″-(β-D-galactopyranosyl)-1″, 2″, 3″-triazol-4″-yl]methyl] amino}phenyl β-D-galactopyranoside 14 and 2-fluoro-4-{bis[[1″-(β-D-glucopyranosyl)-1″, 2″, 3″-triazol-4″-yl]methyl]amino}phenyl β-D-galactopyranoside 15 through glycosylation and click reaction strategies, and their structures were confirmed by NMR and HRMS or elemental analysis data. Among them, 2-fluoro-4-[bis(2'-chloroethyl)amino]phenyl β-D-galacto-pyranoside 5 was found very sensitive to β-gal (E801A) in PBS at 37°C with big ΔδF response. Here, we demonstrated the feasibility of this platform for assessing β-gal activity in solution, and in vitro with lacZ-transfected human MCF7 breast and PC3 prostate tumor cells, by the characterization of β-gal-responsive (19) F-chemical shift changes ΔδF and hydrolytic kinetics.
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