In Vitro and in Vivo Magnetic Resonance Detection of Tumor Cells by Targeting Glutamine Transporters with Gd-Based Probes
摘要:
The glutamine transporting system is up-regulated in tumor cells because cell proliferation requires the uptake of large quantities of glutamine. It has been found that the paramagnetic magnetic resonance imaging (MRI) reporter Gd-DOTAMA-C-6-Gln, where the glutamine residue is covalently bound to the Gd chelate through a C-6 spacer, accumulates in tumor cells both "in vitro" and "in vivo" experiments. The observation that the relaxivity of cellular pellets does not increase with the increase in the amounts of entrapped Gd chelate is taken as an indication that the internalization has occurred through receptor mediated endocytosis. The iv administration of Gd-DOTAMA-C-6-Gln allowed the MRI visualization of tumor masses in A/J mice grafted with the murine neuroblastoma cell line Neuro-2a and in Her2/neu transgenic mice developing multiple mammary carcinoma, respectively.
[EN] PARAMAGNETIC METAL POLYAMINO COMPLEXES FOR MRI VISUALIZATION OF INTERNALIZED POLYNUCLEOTIDES [FR] COMPLEXES METALLIQUES PARAMAGNETIQUES POUR LA VISUALISATION EN IRM DE POLYNUCLEOTIDES INTERNALISES
[EN] PARAMAGNETIC METAL COMPLEXES FOR THE MRI VISUALIZATION OF INTERNALIZED POLYNUCLEOTIDES<br/>[FR] COMPLEXES METALLIQUES PARAMAGNETIQUES POUR LA VISUALISATION EN IRM DE POLYNUCLEOTIDES INTERNALISES
申请人:BRACCO IMAGING SPA
公开号:WO2006027244A2
公开(公告)日:2006-03-16
The invention relates to paramagnetic ion-based contrast agents that are positively charged at physiological pH and that bind non covalently to a polynucleotide chain for use in the preparation of a diagnostic formulation for the 'in vivo' visualization of polynucleotides internalized into human or animal body cells by use of Magnetic Resonance Imaging techniques.
[EN] PARAMAGNETIC METAL POLYAMINO COMPLEXES FOR MRI VISUALIZATION OF INTERNALIZED POLYNUCLEOTIDES<br/>[FR] COMPLEXES METALLIQUES PARAMAGNETIQUES POUR LA VISUALISATION EN IRM DE POLYNUCLEOTIDES INTERNALISES
申请人:BRACCO IMAGING SPA
公开号:WO2006027244A3
公开(公告)日:2006-11-30
In Vitro and in Vivo Magnetic Resonance Detection of Tumor Cells by Targeting Glutamine Transporters with Gd-Based Probes
The glutamine transporting system is up-regulated in tumor cells because cell proliferation requires the uptake of large quantities of glutamine. It has been found that the paramagnetic magnetic resonance imaging (MRI) reporter Gd-DOTAMA-C-6-Gln, where the glutamine residue is covalently bound to the Gd chelate through a C-6 spacer, accumulates in tumor cells both "in vitro" and "in vivo" experiments. The observation that the relaxivity of cellular pellets does not increase with the increase in the amounts of entrapped Gd chelate is taken as an indication that the internalization has occurred through receptor mediated endocytosis. The iv administration of Gd-DOTAMA-C-6-Gln allowed the MRI visualization of tumor masses in A/J mice grafted with the murine neuroblastoma cell line Neuro-2a and in Her2/neu transgenic mice developing multiple mammary carcinoma, respectively.