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- W2024459541 abstract "he chromophore chlorin e6 monoethylene diamine monoamide (CMA) was bound via poly(glutamic acid) (PGA) to two monoclonal antibodies (Mabs), an anti bovine serum albumin (BSA) Mab designated 9.1 and an anti-Leu-1 Mab. The final ratio of chromophore to Mab was dependent on the starting concentration of the chromophore. Binding activity and specificity, determined using 125I-labeled Mab, showed 70% retention at CMA:Mab ratios of 36. Singlet oxygen quantum yields relative to rose bengal, estimated from the bleaching of N,N->dimethylnitrosoaniline, were the same for CMA free or bound to Mab. When Mab 9.1 was conjugated to a diamino cyanine, 1,1′-(3-propylamine hydrobromide)-3,3,3′,3′-tetramethylindotricarbocyanine (TCC), the resultant conjugates were highly aggregated, presumably due to crosslinking via the two amino groups. When anti-Leu-1 target cells, HPB-ALL T-leukemia cells treated with the conjugate were exposed to broad-band, long wavelength irradiation and cell survival evaluated by fluorescence microscopy, a radiant-exposure-dependent phototoxicity was observed. Cells treated similarly with chlorin e6, buffer or Mab alone were unaffected. At the concentrations used in these experiments, neither CMA nor anti-Leu-1 were toxic in the absence of light. These results suggest that conjugates having high chromophore to Mab ratios can be prepared using PGA, and that these conjugates may find use as potential photochemotherapeutic agents." @default.
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- W2024459541 date "1989-10-01" @default.
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- W2024459541 title "Monoclonal antibody-chromophore conjugates as selective phototoxins" @default.
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- W2024459541 doi "https://doi.org/10.1016/0168-3659(89)90022-9" @default.
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