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Differentiation of Macrophages from PBMC monocytes


  • Sterile 50mL conical tubes
  • 24 or 96 well flat bottom tissue culture plates
  • Sterile PBS
  • RPMI 1640 (10% FBS, 1%pen/strep)
  • Human M-CSF (Peprotech)


All work should be done inside a cell culture hood

  • Isolate mononuclear cells from buffy coats
  • Dilute cells to 2.85*106cell/mL in RPMI
  • Add 35mL of cell suspension to BD T-175 tissue culture flasks
  • Let monocytes adhere overnight in 37°C 5%CO2 incubator
  • Wash off non-adherent cells with PBS
  • Add RPMI supplemented with 50ng/mL M-CSF and return to incubator
  • Replace media with M-CSF supplemented RPMI every 2-3 days
  • Macrophages will be ready after 7 days of culture
  • Wash, scrape and replate macrophages in 96 well plates at 15,000 cell/well

Macrophage validation

  • Cells should have high cytoplasm/nucleus size ratio
  • Stain cells for several key markers of macrophages, immature monocytes and dendritic cells
    • Should have high CD68, SRA1, CD36 (macrophage markers)
    • Moderate CD14 expression (monocyte markers)
    • No CD1a and CD83 (dendritic cell markers)
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