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• W2795041486 abstract "Abstract Antibody–drug conjugates (ADC) offer an avenue for specific drug delivery to target cells. Here, parameters with important roles in the cellular processing of ADCs were quantitatively measured for Ab033, an antibody against EGFR. In EGFR-overexpressing cancer cell lines, Ab033 internalized at rates of 0.047/min and 0.15/min for A431 and H441 cells, respectively. Once internalized, Ab033 either trafficked to the lysosome or was recycled; up to 45% of internalized Ab033 returned to the cell surface. Despite such recycling, intracellular accumulation of Ab033 continually increased over 24 hours. Ab033 was conjugated to form a dual toxin ADC containing both cleavable and non-cleavable linker-drug payloads for release rate comparisons. Intracellular concentrations of freed drug from cleavable linker were greater than from non-cleavable linker and exceeded 5 × 106 drug molecules per A431 cell after 24 hours. Compared with intracellular antibody accumulation, formation of released drug was delayed, likely due to the time needed for endo-lysosomal trafficking and subsequent linker/antibody proteolysis. Informed by the quantitative data, a cellular ADC model was constructed and used to summarize processing inefficiencies. Modeling simulations were conducted to determine parameter sensitivity on intracellular drug concentrations, with rates of EGFR internalization and recycling as well as ADC trafficking found to be the most sensitive toward final intracellular drug concentrations. Overall, this study shows Ab033 ADCs to be a viable strategy for delivery of cytotoxic drugs into tumor cells with subsequent modeling efforts able to highlight key processing steps to be improved for increased drug delivery. Mol Cancer Ther; 17(6); 1341–51. ©2018 AACR." @default.
• W2795041486 created "2018-04-06" @default.
• W2795041486 creator A5029826441 @default.
• W2795041486 creator A5054287145 @default.
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• W2795041486 date "2018-05-31" @default.
• W2795041486 modified "2023-09-27" @default.
• W2795041486 title "Mechanistic Modeling of Antibody–Drug Conjugate Internalization at the Cellular Level Reveals Inefficient Processing Steps" @default.
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• W2795041486 doi "https://doi.org/10.1158/1535-7163.mct-17-0672" @default.
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• W2795041486 hasPublicationYear "2018" @default.
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