Related Experiment Videos
Ablation of natural killer cell function by soluble cardiotoxin
1Department of Medicinal and Biological Chemistry, University of Toledo, Ohio.
International Journal of Immunopharmacology
|January 1, 1990
Summary
Thailand cobra venom cardiotoxin inhibits natural killer (NK) cell activity by damaging their plasma membrane. This effect is dose-dependent and not prevented by interferon induction.
Area of Science:
- Immunology
- Toxicology
- Cell Biology
Background:
- Natural killer (NK) cells are crucial for innate immunity, targeting tumor cells.
- Snake venom cardiotoxins are known for their membrane-disrupting properties.
Purpose of the Study:
- To investigate the effect of Thailand cobra cardiotoxin on NK cell activity.
- To determine the mechanism by which cardiotoxin affects NK cells.
Main Methods:
- Murine spleen cells were preincubated with purified cobra cardiotoxin.
- NK cell activity was measured against YAC-1 target cells using 51Cr release and 3H-thymidine uptake assays.
- Complement-mediated lysis and antibody binding assays were performed.
Main Results:
- Cardiotoxin dose-dependently inhibited NK cell activity against YAC-1 cells.
- Interferon induction did not protect NK cells from cardiotoxin.
- Cardiotoxin appeared to directly damage the NK cell plasma membrane.
- Adsorbing cardiotoxin to plates reduced its effect on NK cells but not T lymphocytes.
Conclusions:
- Cardiotoxin directly impairs NK cell function, likely by disrupting the plasma membrane.
- Different molecular regions of cardiotoxin are responsible for its effects on NK cells and T lymphocytes.