Selection based on single cell secretion

Monoclonal expansion of the best high producing cells is time consuming. To reduce the time to screen and create a stable monoclonal antibody producing cell line, VyCAP is developing an innovative solution to select, isolate and expand the cell that produces the best quality antibody in the highest quantities. The innovative solution consists of a combination of our single cell microwell chip in connection with an activated surface. The antibody produced by the single cells is “printed” by the microwells onto this activated surface and detected and analyzed by using fluorescence or SPR.

Workflow to select cells for monoclonal expansion

monoclonal expansion workflow

Step 1: distribute single cells in the chip

Printing antibodies on a surface

After the cells are distributed the microwells are connected to the activated surface with the membrane and pore facing the activated surface. The ensure a good connection between the microwell membrane and the activated surface, the microwell is mechanically clamped onto the surface. The microwells with cells and  the clamped activated surface against it, is placed in a incubator. The cells will produce antibodies and these are printed through the pore onto the activated surface. Depending on the production rate of the cells this combination is left in the incubator for 8 – 48 hrs.

Cell secretion measured for monoclonal expansion

Correlate the printed antibodies with the microwell

After incubation the microwell chip and membrane with the printed antibodies are seperated from each other. The printed antibodies are made visible using an anit-IgG fluorescent label. Next the activated surface is scanned using one of the fluorescent channels of the Puncher system. The printed antibodies appear as bright fluorescent spots. The image below presents the cells in the microwells in green using clacein as fluorescent marker. The produced antibodies are fluorescently labelled and appear as the red larger dots.

captured cell secretion products

Isolate high producer cells for monoclonal expansion

By correlating the location the printed spots with the location of the microwells the cells that produced the highest amount of antibodies can be relocated. Next these cells are isolated and transferred to a culture plate for clonal expansion.

Example of monoclonal expansion


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