TY - JOUR
T1 - An iron-based T 1 contrast agent made of iron-phosphate complexes: In vitro and in vivo studies
AU - Rodríguez, Elisenda
AU - Simoes, Rui V.
AU - Roig, Anna
AU - Molins, Elies
AU - Nedelko, Nataliya
AU - Ślawska-Waniewska, Anna
AU - Aime, Silvio
AU - Arús, Carles
AU - Cabañas, Miquel E.
AU - Sanfeliu, Coral
AU - Cerdán, Sebastián
AU - García-Martín, Maria Luisa
PY - 2007/2/1
Y1 - 2007/2/1
N2 - A new iron-based T 1 contrast agent consisting of a complex of iron ions coordinated to phosphate and amine ligands (Fe(phos) in short) has been characterized by spectroscopic and magnetic measurements. NMR relaxation studies showed r 1 values to be dependent on the phosphate salt concentration, K2HPO4, present in the medium. r 1 reaches a maximum value of 2.5 mM-1 s-1 for measurements carried out at 7 T and 298 K. 31P MRS, Mössbauer spectroscopy and magnetic measurements of Fe(phos) solutions suggest paramagnetic Fe3+ ions present in the studied iron-phosphate complex. In vitro and in vivo toxicity experiments with C6 cells and CD1 mice, respectively, demonstrated lack of toxicity for Fe(phos) at the highest dose tested in the MRI experiments (12 mM iron for C6 cells and 0.32 mmol iron/kg for mice). Finally, T 1 weighted images of brain tumours in mice have shown positive contrast enhancement of Fe(phos) for tumour afflicted regions in the brain. © 2007 ESMRMB.
AB - A new iron-based T 1 contrast agent consisting of a complex of iron ions coordinated to phosphate and amine ligands (Fe(phos) in short) has been characterized by spectroscopic and magnetic measurements. NMR relaxation studies showed r 1 values to be dependent on the phosphate salt concentration, K2HPO4, present in the medium. r 1 reaches a maximum value of 2.5 mM-1 s-1 for measurements carried out at 7 T and 298 K. 31P MRS, Mössbauer spectroscopy and magnetic measurements of Fe(phos) solutions suggest paramagnetic Fe3+ ions present in the studied iron-phosphate complex. In vitro and in vivo toxicity experiments with C6 cells and CD1 mice, respectively, demonstrated lack of toxicity for Fe(phos) at the highest dose tested in the MRI experiments (12 mM iron for C6 cells and 0.32 mmol iron/kg for mice). Finally, T 1 weighted images of brain tumours in mice have shown positive contrast enhancement of Fe(phos) for tumour afflicted regions in the brain. © 2007 ESMRMB.
KW - Fe 8
KW - Iron phosphate particles
KW - Magnetic resonance imaging
KW - T contrast agent 1
U2 - 10.1007/s10334-006-0066-7
DO - 10.1007/s10334-006-0066-7
M3 - Article
SN - 0968-5243
VL - 20
SP - 27
EP - 37
JO - Magnetic Resonance Materials in Physics, Biology, and Medicine
JF - Magnetic Resonance Materials in Physics, Biology, and Medicine
IS - 1
ER -