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Stewart Laboratory Standard Operating Procedure

Stewart Laboratory Standard Operating Procedure               

BrdU Incorporation Protocol

Day 1

  1. Label cells with media containing100 μM BrdU (6 μL/mL of 5 mg/mL stock):
  1. Trypsinize cells, wash from plate with PBS, spin down (400 x g, 1700 rpm, 5 min in 15 ml tubes - no faster!), and resuspend in 10 mL 70% cold EtOH.
  2. Store at -20C overnight or for several days

Day 2

  1. Pellet cells and wash once with wash buffer (PBS + 0.5% IFS).
  2. Pellet and resuspend in 0.5 mL 2M HCl + 0.5% IFS (make fresh!). Incubate at RT for 20 minutes.
  3. Wash cells once with 1 mL wash buffer.
  4. Pellet and resuspend in 0.1 M sodium tetraborate (Na2B4O7). Incubate at RT for 2 minutes.
  5. 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).
  6. Resuspend cell pellet in anti-BrdU antibody (50 μL total solution diluted with wash buffer). Incubate for 20 minutes at 4C.

Use BrdU-FITC: Boeringher #1202693 1:100 dilution (skip to step 9)

Or anti-BrdU: Boeringher #1170376 1:10 dilution

  1. Wash cells once with 1.5 mL wash buffer.
  2. Resuspend cell pellet in anti-mouse FITC antibody (50 μL total solution with wash buffer, 1:500 dilution). Incubate for 20 minutes at 4C.
  3. Wash cells once with 1.5 mL wash buffer.
  4. Resuspend pellet in 0.3 mL PI (10 μg/mL in wash buffer). Incubate for 30 minutes at RT.
  5. Cells are ready for analysis by flow cytometry.