Long-term killing of natural killer-resistant target cells by interferon-alpha-, interferon-gamma-, and interleukin-2-activated natural killer cells.

Journal Article (Journal Article)

The sensitivity of target cells to natural killer (NK) cell-mediated cytotoxicity was investigated. Five target cell lines were examined for susceptibility to killing by activated NK cells in a 4-hour cytotoxicity assay: one of them (K562) was highly sensitive, while the other four were resistant. However, the four NK-resistant target cell lines were fully susceptible to lysis when the assay was extended to 24 h. The cytotoxic cells that killed the NK-resistant target cells in a 24-hour assay were plastic- and nylon wool-nonadherent human peripheral blood mononuclear cells (PBMC) and their cytotoxicity was increased by interferon-alpha, interferon-gamma, and interleukin-2. Further, the cytotoxic activity of PBMC in the long-term assay was associated with large granular lymphocytes purified on a Percoll gradient, that killed the NK-sensitive cell line K562 in a 4-hour assay. All of the above are general criteria to qualify the cytotoxic cells as NK cells. Thus, the NK-resistant phenotype may not reflect absolute immunity to NK-mediated lysis, but it may reflect the different rates at which various target cell lines can be killed.

Full Text

Duke Authors

Cited Authors

  • Sarzotti, M; Klimpel, GR; Baron, S

Published Date

  • 1989

Published In

Volume / Issue

  • 8 / 2

Start / End Page

  • 66 - 75

PubMed ID

  • 2503715

Pubmed Central ID

  • 2503715

International Standard Serial Number (ISSN)

  • 0254-7600


  • eng

Conference Location

  • Switzerland