title: Polynuclear Sm(III) polyamidoamine-based dendrimer: a single probe for combined visible and near-infrared live-cell imaging.
abstract: We report herein the synthesis of a luminescent polynuclear dendritic structure (Sm(III)-G3P-2,3Nap) in which eight Sm(III) ions are sensitized by thirty-two 2,3-naphthalimide chromophores. Upon a single excitation wavelength, the dendrimer complex exhibits two types of emission in the visible and in the near-infrared (NIR) ranges. Sm(III)-G3P-2,3Nap was non-cytotoxic after 24 h of incubation and up to 2.5 μM. The ability of the Sm(III)-based probe to be taken up by cells was confirmed by confocal microscopy. Epifluorescence microscopy validated Sm(III)-G3P-2,3Nap as a versatile probe, capable of performing interchangeably in the visible or NIR for live-cell imaging. As both emissions are obtained from a single complex, the cytotoxicity and biodistribution are inherently the same. The possibility for discriminating the sharp Sm(III) signals from autofluorescence in two spectral ranges increases the reliability of analysis and reduces the probability of artifacts and instrumental errors.
authors.forename: Alexandra
authors.initials: A
authors.lastname: Foucault-Collet
authors.forename: Chad M
authors.initials: CM
authors.lastname: Shade
authors.forename: Iuliia
authors.initials: I
authors.lastname: Nazarenko
authors.forename: Stéphane
authors.initials: S
authors.lastname: Petoud
authors.forename: Svetlana V
authors.initials: SV
authors.lastname: Eliseeva
mesh_terms: D000818:Animals; D002470:Cell Survival / Q000187:drug effects; D050091:Dendrimers / Q000737:chemistry* / Q000633:toxicity; D006367:HeLa Cells; D006801:Humans; D007477:Ions / Q000737:chemistry; D051379:Mice; D018613:Microscopy, Confocal; D041681:NIH 3T3 Cells; D011073:Polyamines / Q000737:chemistry*; D012493:Samarium / Q000737:chemistry*; D019265:Spectroscopy, Near-Infrared
chemical_list: D050091:Dendrimers; D007477:Ions; C531249:Poly(amidoamine); D011073:Polyamines; D012493:Samarium