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Comparison of the radiotoxicity of two alpha-particle-emitting immunoconjugates, terbium-149 and bismuth-213, directed against a tumor-specific, exon 9 deleted (d9) E-cadherin adhesion protein
dc.creator | Miederer, M | |
dc.creator | Seidl, C | |
dc.creator | Beyer, GJ | |
dc.creator | Charlton, DE | |
dc.creator | Vranješ-Đurić, Sanja | |
dc.creator | Čomor, Jožef J. | |
dc.creator | Huber, R | |
dc.creator | Nikula, T | |
dc.creator | Apostolidis, C | |
dc.creator | Schuhmacher, C | |
dc.creator | Becker, KF | |
dc.creator | Senekowitsch-Schmidtke, R | |
dc.date.accessioned | 2018-03-01T19:16:06Z | |
dc.date.available | 2018-03-01T19:16:06Z | |
dc.date.issued | 2003 | |
dc.identifier.issn | 0033-7587 | |
dc.identifier.uri | https://vinar.vin.bg.ac.rs/handle/123456789/2630 | |
dc.description.abstract | We investigated the effects of the a-particle emitters Tb-149 and Bi-213 coupled to a tumor-specific antibody targeting the mutated delta 9 E-cadherin (d9 E-Cad) on single cells and cell pellets. The d9 mutation of the adhesion molecule E-cadherin is found in 10% of diffuse-type gastric cancers and is not expressed in normal tissue. Human breast cancer cells (MDA-MB-435S) transfected with d9 E-Cad or the wild-type E-cadherin gene were used to study the effects of anti-d9 E-Cad MAb coupled to Tb-149 and Bi-213 (Tb-149-d9 MAb and Bi-213-d9 MAb). The density of binding sites determined on transfected MDA tumor cells by Scatchard analysis and flow cytometry varied from 4 x 10(4) to 6 x 10(4) antigens per cell. Internalization of radioimmunoconjugates by cells expressing d9 E-Cad was less than 10% of bound antibody within 240 min. The effect of the radioimmunoconjugates on cell suspensions and cell pellets was quantified by [H-3]thymidine incorporation, and the dose to the cell nuclei was determined using microdosimetric calculations. Tb-149 and Bi-213 immunoconjugates affected cells in suspension similarly. Significant differences in the proliferation capacity of d9 E-cadherin- and wildtype E-cadherin-expressing cells were observed at activity concentrations around 185 kBq/ml, corresponding to antibody concentrations between 200 ng/ml and 1000 ng/ml. Proliferation after incubation with Bi-213-d9 MAb was 50% greater in pelleted wild-type E-Cad-expressing cells compared to wildtype E-Cad cells in suspension. In contrast, the proliferation of pelleted d9 E-Cad cells was similar to that of d9 E-Cad cells in suspension. For Tb-149-d9 MAb, no significant difference was found between pelleted cells and cells in suspension for low activity concentrations. However, at high activity concentrations, Tb-149-d9 MAb had only a small effect on pelleted cells. These in vitro studies demonstrate different effects of Tb-149 and Bi-213 conjugated to a tumor-specific antibody toward single cells and tumor cell pellets. Microdosimetric simulation of single cell survival after a-particle irradiation modeled the experimental results with reasonable accuracy. (C) 2003 by Radiation Research Society. | en |
dc.rights | restrictedAccess | en |
dc.source | Radiation Research | en |
dc.title | Comparison of the radiotoxicity of two alpha-particle-emitting immunoconjugates, terbium-149 and bismuth-213, directed against a tumor-specific, exon 9 deleted (d9) E-cadherin adhesion protein | en |
dc.type | article | en |
dcterms.abstract | Миедерер, М; Сеидл, Ц; Беyер, ГЈ; Цхарлтон, ДЕ; Врањес-Дуриц, С; Цомор, ЈЈ; Хубер, Р; Никула, Т; Aпостолидис, Ц; Сцхухмацхер, Ц; Сенекоwитсцх-Сцхмидтке, Р; Бецкер, КФ; | |
dc.citation.volume | 159 | |
dc.citation.issue | 5 | |
dc.citation.spage | 612 | |
dc.citation.epage | 620 | |
dc.identifier.wos | 000182629400005 | |
dc.identifier.doi | 10.1667/0033-7587(2003)159[0612:COTROT]2.0.CO;2 | |
dc.citation.rank | M21 | |
dc.identifier.pmid | 12710872 | |
dc.identifier.scopus | 2-s2.0-0037964241 |
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