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• W2006554573 abstract "To establish a simple and rapid method for the screening of stable recombinant Chinese hamster ovary (CHO) cell lines, we have developed a cell surface labeling technique using fluorescently tagged antibodies that bind to secreted target proteins at low temperature. Using fluorescence intensity as the sole criterion for selection of cells, we are able to enrich populations of highly productive cells using preparative flow cytometry sorting. Reiterative sorting based on selection of cells having the highest fluorescence intensity of cell surface labeled protein results in dramatic increases in specific cellular productivity. Using lymphotoxin-beta receptor IgG fusion protein as a model system, we have demonstrated a greater than 20-fold increase in specific productivity (0.49-11.5 pg cell(-1) day(-1)) (pcd) without the use of methotrexate (MTX)-mediated selection or amplification. In addition, the flow cytometry used to enrich for and clone high producer cell lines has reduced development time by more than 50% and the number of screening assays by more than 10-fold. When a transfected population of CHO cells expressing a humanized version of the murine monoclonal antibody (mAb) AQC2 directed against human alpha 1 beta 1 integrin was subjected to the same treatment, a 25-fold improvement in specific productivity (0.3-8.0 pcd) was observed. Furthermore, similar application of this technique to MTX-amplified clones resulted in up to 120-fold overall improvement in specific productivity (up to 42 pcd). Greater than 20 examples are also presented to demonstrate the robustness and performance of this technique." @default.
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• W2006554573 date "2003-06-01" @default.
• W2006554573 modified "2023-10-17" @default.
• W2006554573 title "A simple method for enriching populations of transfected CHO cells for cells of higher specific productivity" @default.
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• W2006554573 doi "https://doi.org/10.1016/s0022-1759(03)00108-x" @default.
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