alexa Effect of the intracellular localization of a Gd-based imaging probe on the relaxation enhancement of water protons.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Molecular Imaging & Dynamics

Author(s): Terreno E, Geninatti Crich S, Belfiore S, Biancone L, Cabella C,

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Abstract Gd-HPDO3A has been internalized into rat hepatocarcinoma cells in the cytoplasm (by electroporation) or in intracellular vesicles (by pinocytosis), respectively. In the former case, the observed relaxation rates are likely dependent upon the amount of internalized paramagnetic complex, whereas in the latter case the relaxation enhancement is "quenched" to a plateau value (about 3 s(-1)) when the entrapped amount of Gd-chelate is higher than 1 x 10(10) Gd/cell. The observed behavior has been accounted in terms of a theoretical treatment based on equations formally derived by Labadie et al. (J Magn Reson B 1994;105:99-102). On this basis, entrapment into intracellular vesicles has been treated as a three-site water exchange (extracellular/cytoplasm/vesicle compartments), whereas the cell pellets containing the paramagnetic agent spread out in the cytoplasm can be analyzed by a two-site exchange system. Magn Reson Med, 2006. (c) 2006 Wiley-Liss, Inc. This article was published in Magn Reson Med and referenced in Journal of Molecular Imaging & Dynamics

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