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[Human LAK cell induction and its biological characteristics]
1Cancer Institute, Chinese Academy of Medical Sciences, Beijing.
Summary
Interleukin 2 (IL-2) effectively induces lymphokine-activated killer (LAK) cells from peripheral blood. These LAK cells can lyse various tumor cells resistant to natural killer (NK) cells, showing distinct biological characteristics.
Area of Science:
- Immunology
- Cell Biology
Context:
- Peripheral blood mononuclear cells (PBMC) are a source of immune cells.
- Interleukin 2 (IL-2) is a cytokine known to modulate immune responses.
- Natural killer (NK) cells are part of the innate immune system involved in tumor surveillance.
Purpose:
- To investigate the induction and characteristics of lymphokine-activated killer (LAK) cells.
- To compare LAK cell activity with NK cell activity.
- To determine the susceptibility of tumor cells to LAK cell-mediated lysis.
Summary:
- Optimal LAK cell induction from PBMC was achieved with 30-40 units/ml of IL-2 over 3-4 days.
- LAK cells effectively lysed NK cell-resistant tumor cell lines (Raji, CEM, HeLa, esophageal carcinoma, ovarian carcinoma).
- LAK cells exhibited differential sensitivity to mitomycin C and were unaffected by anti-CD2 monoclonal antibody, unlike NK cells.
Impact:
- LAK cells represent a promising therapeutic strategy against tumors resistant to NK cell activity.
- Understanding LAK cell biology provides insights into adaptive immunotherapy.
- This research differentiates LAK cells from NK cells, highlighting unique cytotoxic mechanisms.