Induction of antitumor reactive cells or suppressor cells by different molecular species isolated from the same
Abstract:
The inability of spontaneous and some laboratory-induced tumors to stimulate the immune system has continuously raised the question of the validity of using immunological maneuvers in order to control tumor growth. In this project we suggest that a tumor which is nonimmunogenic still has an immunogenic potential that can be revealed and used in order to stimulate antitumor immunity and consequently tumor destruction. YAC, a Moloney-virus-induced tumor of A mice, failed to stimulate immunological responses. This tumor homogenate was exposed to nonreduced sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). At the end of the electrophoresis, the gels were sliced and injected in sequential order into various groups of A mice. It was found that some of the gel slices (usually with M.W. of 100 K or less) induced cytotoxic responses, whereas other gel slices (usually with M.W. of about 150 K) induced suppressor cells. Similarly, certain gel slices induced cells that inhibited the in vivo tumor growth, whereas others enhanced the in vivo tumor growth. These last two types of cells did not present the same cellular population that mediated the cellular cytotoxicity or the suppressive effects respectively. It was concluded that poorly immunogenic tumor cells do possess immunogenic potential that can be revealed after dissociation between the immunogenic and suppressogenic entities.
Insights
Even non-immunogenic tumors possess hidden immune potential. Dissociating tumor components using SDS-PAGE can reveal this potential, stimulating anti-tumor immunity and tumor destruction.
Area of Science:
- Immunology
- Oncology
- Biochemistry
Background:
- Many tumors fail to elicit an immune response, questioning immunotherapy's efficacy.
- Non-immunogenic tumors present a challenge for cancer treatment strategies.
Purpose of the Study:
- To investigate if non-immunogenic tumors have latent immunogenic potential.
- To explore methods for revealing and utilizing this potential to stimulate anti-tumor immunity.
Main Methods:
- Utilized Moloney-virus-induced YAC tumor from A mice.
- Applied nonreduced sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) to tumor homogenate.
- Injected sequential gel slices into A mice to assess immune responses.
Main Results:
- Specific gel slices (≤100 K M.W.) induced cytotoxic T-cell responses.
- Other gel slices (≈150 K M.W.) induced suppressor cells.
- Distinct cell populations mediated cytotoxicity, suppression, and modulated in vivo tumor growth (inhibition/enhancement).
Conclusions:
- Poorly immunogenic tumor cells contain a hidden immunogenic potential.
- Dissociation of tumor components can reveal this potential, separating immunogenic and suppressogenic entities.
- This dissociation is key to stimulating anti-tumor immunity and tumor destruction.
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