High-Sensitivity Cytotoxicity Assays for Nonadherent Cells

  • M. Jules Mattes
Part of the Methods in Molecular Medicine™ book series (MIMM, volume 110)


High-sensitivity cytotoxicity assays refer to assays that can detect high levels of cell kill, to many powers of 10, and that can detect, ideally, a single remaining viable cell. Two such assays are described here, which have been used with Raji B-lymphoma cells, and are applicable to other nonadherent target cells. The first is a cell-counting assay, performed over a 3-wk period, which provides a simple, reliable, and sensitive assay of cytotoxicity. By determining the time required for 16-fold multiplication, the apparent fraction surviving can be calculated. This assay does not correct for treatment-induced delays in cell division and is dependent on maintaining the cells in exponential growth. The second assay measures colony-forming units using a limiting dilution method. Feeder cells are required to obtain a high cloning efficiency. Each dilution is plated in 48 wells of a 96-well plate, and positive wells are scored rapidly, by eye, after two wk.

Key Words

Cytotoxicity limiting dilution B-cell lymphoma 


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Copyright information

© Humana Press Inc., Totowa, NJ 2005

Authors and Affiliations

  • M. Jules Mattes
    • 1
  1. 1.Center for Molecular Medicine and ImmunologyBellevilleUSA

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