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Title: [(99)mTc(CO)(3)]- Radiolabeled Bevacizumab: In vitro and in vivo Evaluation in a Melanoma Model
Authors: CAMACHO, XimenaGARCIA, Maria FernandaCALZADA, VictoriaFERNANDEZ, MarceloCHABALGOITY, Jose A.MORENO, MariaAGUIAR, Rodrigo Barbosa deALONSO, OmarGAMBINI, Juan PabloCHAMMAS, RogerCABRAL, Pablo
Citation: ONCOLOGY, v.84, n.4, p.200-209, 2013
Abstract: Introduction: Vascular endothelial growth factor (VEGF) is one of the classic factors to tumor-induced angiogenesis in several tumor types, including melanoma. Bevacizumab, a monoclonal antibody against VEGF, could be used as an imaging tool in preclinical studies. Objective: To radiolabel bevacizumab with [Tc-99m(CO)(3)(OH2)(3)]+ and evaluate it in vivo and in vitro for melanoma imaging properties. Methods: Bevacizumab was radiolabeled with [Tc-99m(CO)(3)(OH2)(3)]+ ion in saline. The radiochemical stability of the labeled antibody was assessed. The biodistribution and scintigraphy imaging of the radiolabeled antibody were evaluated in normal C57BL/6J mice and in C57BL/6J mice bearing murine B16F1 melanoma tumors. Immunoreactivity of bevacizumab to murine tumors was determined from direct immunofluorescence and immunoblotting assays. Results: We demonstrate that Tc-99m(CO)(3) -bevacizumab was stable. In vivo biodistribution studies revealed that tumor uptake of Tc-99m(CO)(3)-bevacizumab was 2.64 and 2.51 %ID/g at 4 and 24 h postinjection. Scintigraphy image studies showed tumor selective uptake of Tc-99m(CO)(3)-bevacizumab in the tumor-bearing mice. This affinity was confirmed by immunoassays performed on B16F10 tumor samples. Conclusions: Tc-99m(CO)(3)-bevacizumab could be used as an approach for tumor nuclear imaging in preclinical studies. This should be useful to provide insights into the angiogenic stimulus before and after chemotherapy, which might help improve current antitumor therapy.
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Artigos e Materiais de Revistas Científicas - FM/MDR
Departamento de Radiologia - FM/MDR

Artigos e Materiais de Revistas Científicas - LIM/24
LIM/24 - Laboratório de Oncologia Experimental

Artigos e Materiais de Revistas Científicas - ODS/03
ODS/03 - Saúde e bem-estar

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