Towards understanding the design of dual-modal MR/fluorescent probes to sense zinc ions

Dalton Trans. 2015 Mar 21;44(11):4976-85. doi: 10.1039/c4dt02981j.

Abstract

A series of gadolinium complexes were synthesised in order to test the design of dual-modal probes that display a change in fluorescence or relaxivity response upon binding of zinc. A dansyl-DO3ATA gadolinium complex [GdL1] displayed an increase and a slight blue-shift in fluorescence in the presence of zinc; however, a decrease in relaxation rate was observed. Consequently, the ability of the well-known zinc chelator, BPEN, was assessed for relaxivity response when conjugated to the gadolinium chelate. The success of this probe [GdL2], lead to the inclusion of the same zinc-probing moiety alongside a longer wavelength emitting fluorophore, rhodamine [GdL3], to arrive at the final iteration of these first generation dual-modal zinc-sensing probes. The compounds give insight into the design protocols required for the successful imaging of zinc ions.

MeSH terms

  • Drug Design*
  • Fluorescent Dyes / chemistry
  • Gadolinium / chemistry*
  • Magnetic Resonance Imaging / methods*
  • Organometallic Compounds / chemistry*
  • Zinc / analysis*
  • Zinc / chemistry*

Substances

  • Fluorescent Dyes
  • Organometallic Compounds
  • Gadolinium
  • Zinc