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[Non-specific killer cells in tumor immune response]
Abstract:
This article focuses on the roles of natural killer (NK) cells and lymphokine-activated killer (LAK) cells in immune surveillance against malignant tumors. NK cells have a natural and also rapidly activatable ability to lyse a variety of tumor cell lines. There is considerable evidence for the ability of NK cells to eliminate metastatic tumor cells and thereby resist tumor spread. There is also a correlation between increased tumor incidence (primarily lymphoma) and depressed NK activity. Therefore, NK cells appear to contribute to antitumor resistance, especially against the microevolution of tumor cells and metastasis. LAK cells, which can be induced by a lymphokine, interleukin 2, in a subset of NK cells, express cytotoxic activity toward an extensive spectrum of histologically distinct fresh autologous tumor cells. Fresh tumor cells resistant to lysis by NK cells are extremely sensitive to lysis by LAK cells. Although the biological role of these cells is presently unknown, their characteristics also point toward an important function in immune surveillance.
Insights
Natural killer (NK) and lymphokine-activated killer (LAK) cells are crucial for immune surveillance against tumors. These cells demonstrate potent cytotoxic activity, helping to eliminate malignant cells and prevent cancer spread.
Area of Science:
- Immunology
- Oncology
Context:
- Natural killer (NK) cells possess inherent cytotoxic capabilities against various tumor cell lines.
- Evidence suggests NK cells play a role in eliminating metastatic cells, thereby inhibiting tumor metastasis.
- Depressed NK cell activity correlates with increased tumor incidence, particularly lymphomas.
Purpose:
- To explore the roles of NK cells and lymphokine-activated killer (LAK) cells in antitumor immune surveillance.
- To highlight the cytotoxic potential of NK and LAK cells against malignant tumors.
Summary:
- NK cells exhibit natural and inducible cytotoxicity against tumor cells, contributing to antitumor resistance and combating metastasis.
- LAK cells, derived from NK cells via interleukin-2, display broad cytotoxicity against diverse tumor types, including those resistant to NK cells.
- Both NK and LAK cells show promise in immune surveillance against cancer, despite the unknown precise biological role of LAK cells.
Impact:
- Understanding NK and LAK cell functions can inform novel cancer immunotherapy strategies.
- Highlights the potential of cellular immunotherapies in cancer treatment and prevention.
- Provides insights into the mechanisms of immune system's natural defense against cancer development and progression.