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Immunobiological properties of 1-butanol-extracted cell surface antigens
Abstract:
Extracts of viable 3-methylcholanthrene-induced murine sarcoma cells (MCA-F and MCA-2A) prepared using single-phase (2.5%) 1-butanol significantly retarded the outgrowth of the homotypic, but not the heterotypic, tumor of syngeneic C3H/HeJ mice. Butanol extracts specifically evoked a delayed hypersensitivity response in tumor-immune syngeneic mice, but not in alloimmune DBA/2J mice. Crude butanol extracts of MCA-F cells did not contain alloantigenic activity, as shown by their inability to block H-2 or Ia-specific antibodies in a complement-dependent cytotoxicity assay. Absorption of these same allospecific reagents with untreated or with butanol-extracted cells indicated that H-2 antigens remain associated with the cell surface during extraction. Thus, butanol appears to release tumor antigens, but not alloantigens, from the cell surface.
Insights
Murine sarcoma extracts prepared with 1-butanol inhibited tumor growth in syngeneic mice. These extracts released tumor antigens but not alloantigens from cell surfaces, suggesting a specific mechanism for immune response modulation.
Area of Science:
- Immunology
- Oncology
- Biochemistry
Background:
- 3-methylcholanthrene (MCA) induces sarcomas in mice, providing a model for studying tumor-specific antigens.
- Understanding how tumor antigens are released and interact with the immune system is crucial for developing effective cancer immunotherapies.
Purpose of the Study:
- To investigate the effect of 1-butanol extracts from murine sarcoma cells on tumor outgrowth.
- To determine if these extracts release tumor-specific antigens or alloantigens.
- To assess the immunogenicity of the released antigens in syngeneic and allogeneic mouse models.
Main Methods:
- Preparation of single-phase 1-butanol extracts from viable MCA-F and MCA-2A murine sarcoma cells.
- Assessing tumor outgrowth inhibition in syngeneic C3H/HeJ mice.
- Evaluating delayed hypersensitivity responses in tumor-immune and alloimmune mice.
- Employing complement-dependent cytotoxicity assays to detect alloantigenic activity (H-2 and Ia).
- Absorption assays using allospecific reagents to confirm antigen association with cell surfaces.
Main Results:
- 1-butanol extracts significantly retarded homotypic tumor outgrowth but not heterotypic tumor outgrowth.
- Extracts specifically induced a delayed hypersensitivity response in tumor-immune syngeneic mice, but not in alloimmune mice.
- Crude butanol extracts lacked alloantigenic activity, failing to block H-2 or Ia-specific antibodies.
- H-2 antigens remained cell-associated after butanol extraction, indicating selective release of tumor antigens.
Conclusions:
- 1-butanol effectively releases tumor antigens from the cell surface while preserving alloantigens.
- The released tumor antigens are capable of eliciting a specific immune response in tumor-bearing hosts.
- This suggests a potential strategy for isolating and utilizing tumor-specific antigens for immunotherapy.