Lanthanide(III) complexes of DOTA-glycoconjugates: a potential new class of lectin-mediated medical imaging agents.
The synthesis and characterization of a new class of DOTA (1,4,7,10-tetrakis(carboxymethyl)-1,4,7,10-tetraazacyclododecane) monoamide-linked glycoconjugates (glucose, lactose and galactose) of different valencies (mono, di and tetra) and their Sm(III), Eu(III) and Gd(III) complexes are reported. The 1H NMR spectrum of Eu(III)-DOTALac2 shows the predominance of a single structural isomer of square antiprismatic geometry of the DOTA chelating moiety and fast rotation about the amide bond connected to the targeting glycodendrimer. The in vitro relaxivity of the Gd(III)-glycoconjugates was studied by 1H nuclear magnetic relaxation dispersion (NMRD), yielding parameters close to those reported for other DOTA monoamides. The known recognition of sugars by lectins makes these glycoconjugates good candidates for medical imaging agents (MRI and gamma scintigraphy).
Centro de Química, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal. jandre@quimica.uminho.pt
João P
JP
André
Carlos F G C
CF
Geraldes
José A
JA
Martins
André E
AE
Merbach
Maria I M
MI
Prata
Ana C
AC
Santos
João J P
JJ
de Lima
Eva
E
Tóth
D002241:Carbohydrates / Q000737:chemistry*; D005690:Galactose / Q000737:chemistry; D005947:Glucose / Q000737:chemistry; D006573:Heterocyclic Compounds, 1-Ring / Q000737:chemistry*; D007785:Lactose / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D037102:Lectins / Q000737:chemistry*; D008024:Ligands; D008279:Magnetic Resonance Imaging / Q000379:methods*; D015394:Molecular Structure; D011877:Radionuclide Imaging / Q000379:methods*; D012996:Solutions
D002241:Carbohydrates; D006573:Heterocyclic Compounds, 1-Ring; D028581:Lanthanoid Series Elements; D037102:Lectins; D008024:Ligands; D012996:Solutions; C071349:1,4,7,10-tetraazacyclododecane- 1,4,7,10-tetraacetic acid; D005947:Glucose; D007785:Lactose; D005690:Galactose