Stewart Laboratory Standard Operating Procedure
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Stewart Laboratory Standard Operating Procedure
BrdU Incorporation Protocol
Day 1
Label cells with media containing100 μM BrdU (6 μL/mL of 5 mg/mL stock):- Diploid Fibroblasts, 4-6 hours
- ES cells, 30 minutes
- 3T3 cells, 2.5 hours
Day 2
Pellet cells and wash once with wash buffer (PBS + 0.5% IFS). Pellet and resuspend in 0.5 mL 2M HCl + 0.5% IFS (make fresh!). Incubate at RT for 20 minutes. Wash cells once with 1 mL wash buffer. Pellet and resuspend in 0.1 M sodium tetraborate (Na2 B4 O7 ). Incubate at RT for 2 minutes. Wash cells twice with 1 mL wash buffer (if a negative control of PI alone stain is desired, set aside a fraction of cells until step 10). Resuspend cell pellet in anti-BrdU antibody (50 μL total solution diluted with wash buffer). Incubate for 20 minutes at 4°C.Use BrdU-FITC: Boeringher #1202693 1:100 dilution (skip to step 9)
Or anti-BrdU: Boeringher #1170376 1:10 dilution
Wash cells once with 1.5 mL wash buffer. Resuspend cell pellet in anti-mouse FITC antibody (50 μL total solution with wash buffer, 1:500 dilution). Incubate for 20 minutes at 4°C. Wash cells once with 1.5 mL wash buffer. Resuspend pellet in 0.3 mL PI (10 μg/mL in wash buffer). Incubate for 30 minutes at RT. Cells are ready for analysis by flow cytometry.
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