Related Experiment Videos
Induction of natural killer cell activity by inactivated Candida albicans in mice
Abstract:
Injection of merthiolate-inactivated yeast form cells of Candida albicans into the peritoneal cavities of mice induced the appearance of a cytolytic effector population against YAC-1 tumor cell lines. This induction was maximally manifested in 5- to 8-week-old animals 3 to 4 days after injection of 2 X 10(7)C. albicans cells, and the peritoneal lytic population exerted its optimum cytotoxic effect after 4 h of incubation. No significant natural cytotoxic activity was generated by C. albicans in the bone marrow or thymus, whereas there was a slight, transient, but significant depression of natural splenic cytotoxicity. Experiments performed to characterize the natural cytotoxic population elicited by the inactivated yeast showed that the effectors were nonadherent, nonphagocytic cells. Moreover, the anti-YAC-1 lytic activity was partially sensitive to anti-Thy1.2 serum and was completely abrogated by treatment of peritoneal nonadherent cells with monoclonal anti-asialo GM1 antibodies. Finally, the peritoneal population of cytotoxic cells induced by C. albicans was fully susceptible to Ly5.1 plus anti-immunoglobulin G2a and complement lysis. Although different cell populations could be induced by inactivated C. albicans, all of our data support the view that the anti-YAC-1 activity was entirely attributable to natural killer lymphocytes.
Insights
Injecting inactivated Candida albicans yeast into mice induced a potent anti-tumor cell response. This immune activity was primarily mediated by natural killer (NK) lymphocytes in the peritoneal cavity.
Area of Science:
- Immunology
- Oncology
Background:
- Candida albicans is a fungus with complex interactions with the host immune system.
- Tumor cell lysis can be mediated by various immune cell populations.
- Understanding the induction of cytotoxic cells is crucial for immunotherapy.
Purpose of the Study:
- To investigate the immune response induced by inactivated Candida albicans yeast.
- To characterize the effector cells responsible for cytolytic activity against tumor cells.
Main Methods:
- Injection of merthiolate-inactivated Candida albicans yeast into mouse peritoneal cavities.
- Assessment of cytolytic activity against YAC-1 tumor cell lines.
- Characterization of effector cells using adherence, phagocytosis, and antibody-mediated lysis assays.
Main Results:
- Inactivated Candida albicans induced a peritoneal cytolytic effector population.
- The optimal induction occurred in 5- to 8-week-old mice 3-4 days post-injection.
- Effector cells were nonadherent, nonphagocytic, and sensitive to anti-Thy1.2 and anti-asialo GM1 antibodies.
- Splenic cytotoxicity showed a transient depression, while bone marrow and thymus showed no significant activity.
Conclusions:
- The study identified natural killer (NK) lymphocytes as the primary mediators of anti-YAC-1 activity induced by Candida albicans.
- Candida albicans can be used to elicit a specific NK cell-mediated anti-tumor response.