2026-06-14T03:32:16Zhttps://repisalud.isciii.es/rest/oai/request

oai:repisalud.isciii.es:20.500.12105/52092024-11-29T23:29:59Zcom_20.500.12105_19604com_20.500.12105_2051com_20.500.12105_2173col_20.500.12105_19605col_20.500.12105_19597

00925njm 22002777a 4500 dc de Lucas, A. G. author Schuhmacher, A. J. author Oteo, M. author Romero, E. author Camara, J. A. author de Martino, A. author Arroyo, Alicia G author Morcillo, M. A. author Squatrito, Massimo author Martinez Torrecuadrada, Jorge Luis author Mulero, Francisca author 2016 Background A critical challenge in the management of Glioblastoma Multiforme (GBM) tumors is the accurate diagnosis and assessment of tumor progression in a noninvasive manner. We have identified Membrane-type 1 matrix metalloproteinase (MT1-MMP) as an attractive biomarker for GBM imaging since this protein is actively involved in tumor growth and progression, correlates with tumor grade and is closely associated with poor prognosis in GBM patients. Here, we report the development of an immunoPET tracer for effective detection of MT1-MMP in GBM models. Methods An anti-human MT1-MMP monoclonal antibody (mAb), LEM2/15, was conjugated to p-isothiocyanatobenzyl-desferrioxamine (DFO-NCS) for Zr-89 labeling. Biodistribution and PET imaging studies were performed in xenograft mice bearing human GBM cells (U251) expressing MT1-MMP and non-expressing breast carcinoma cells (MCF-7) as negative control. Two orthotopic brain GBM models, patient-derived neurospheres (TS543) and U251 cells, with different degrees of blood-brain barrier (BBB) disruption were also used for PET imaging experiments. Results Zr-89 labeling of DFO-LEM2/ 15 was achieved with high yield (>90\%) and specific activity (78.5 MBq/mg). Biodistribution experiments indicated that Zr-89-DFO-LEM2/15 showed excellent potential as a radiotracer for detection of MT1-MMP positive GBM tumors. PET imaging also indicated a specific and prominent Zr-89-DFO-LEM2/15 uptake in MT1-MMP+ U251 GBM tumors compared to MT1-MMP-MCF-7 breast tumors. Results obtained in orthotopic brain GBM models revealed a high dependence of a disrupted BBB for tracer penetrance into tumors. Zr-89-DFO-LEM2/15 showed much higher accumulation in TS543 tumors with a highly disrupted BBB than in U251 orthotopic model in which the BBB permeability was only partially increased. Histological analysis confirmed the specificity of the immunoconjugate in all GBM models. Conclusion A new anti MT1-MMP-mAb tracer, Zr-89-DFO-LEM2/15, was synthesized efficiently. In vivo validation showed high-specific-contrast imaging of MT1-MMP positive GBM tumors and provided strong evidence for utility of MT1-MMP-targeted immunoPET as an alternate to nonspecific imaging of GBM. PLoS One. 2016; 11(7):e0158634 10.1371/journal.pone.0158634 1932-6203 Plos One 27462980 http://hdl.handle.net/20.500.12105/5209 P-ISOTHIOCYANATOBENZYL-DESFERRIOXAMINE TYPE-1 MATRIX-METALLOPROTEINASE GLIOBLASTOMA-MULTIFORME MONOCLONAL-ANTIBODIES 1-MATRIX METALLOPROTEINASE ADJUVANT TEMOZOLOMIDE BIFUNCTIONAL CHELATE ENDOTHELIAL-CELLS BRAIN-TUMORS IN-VIVO Targeting MT1-MMP as an ImmunoPET-Based Strategy for Imaging Gliomas