Example 27
Allogenic anti-CD19 CAR T cells were generated as described above. At 21 days post gene editing, the following protocol was used to stain cells for expression of the indicated marker:
Stain cells with the following antibody for 30 min at 4° C.
Anti-mouse Fab2 biotin 115-065-006 (Jackson ImmunoRes) 1:5
Wash cells 1× with FACS buffer.
Add 1 μg of normal mouse IGG (Peprotech 500-M00) to 100 μL of cells for 10 min at RT.
Wash cells 1× with FACS buffer and resuspend in 100 μL of FACS buffer.
Stain cells with the following cocktail for 15 min at RT.
The antibodies used in this Example are as follows:
This data shows that health of TRAC-/B2M-/anti-CD19+CAR T cells is maintained at day 21 post gene editing (the cells behave as normal (unedited) cells).