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Generation of crossreacting tumor antigens in ascitic derivatives from murine methylcholanthrene-induced sarcomas
Abstract:
Sarcomas induced by the chemical carcinogen 3-methyl-cholanthrene (MC) in pedigreed BALB/c strain mice were studied for the existence and characteristics of tumor-specific antigens that induce protective immune defenses in syngeneic mice (TATA). It was found that each of the neoplasms expressed a unique immunogenicity that was stable and heritable over a period of 125 transfers in vivo. Common or crossreacting TATA were not observed. When converted to an ascitic form, two of these sarcomas, CII-7 and CII-10, were found to be crossreactive, presumably sharing TATA with each other and with the MC-induced sarcoma Meth A. Two other neoplasms converted to the ascitic form, however, retained their unique TATA. Although the precise nature of unique and crossreacting TATA is not known, it is hoped that recent investigations in the purification of TATA of chemically induced neoplasms will shed light on the mechanisms responsible for the diversity of tumor-specific antigens.
Insights
Chemically induced sarcomas in mice exhibit unique tumor-specific antigens (TATA). While generally distinct, some ascitic forms showed cross-reactivity, suggesting shared TATA, offering insights into tumor antigen diversity.
Area of Science:
- Immunology
- Oncology
- Carcinogenesis
Background:
- Chemically induced tumors in mice are models for studying anti-tumor immunity.
- Tumor-specific transplantation antigens (TATA) are crucial for immune rejection of tumors.
- Understanding TATA diversity is key to developing effective cancer immunotherapies.
Purpose of the Study:
- To investigate the existence and characteristics of tumor-specific antigens (TATA) in 3-methylcholanthrene-induced sarcomas.
- To determine if these TATA induce protective immune responses in syngeneic mice.
- To explore the diversity and potential cross-reactivity of TATA in chemically induced neoplasms.
Main Methods:
- Induction of sarcomas in BALB/c mice using 3-methylcholanthrene (MC).
- In vivo serial transfers (125 passages) to assess antigen stability and heritability.
- Conversion of sarcomas to ascitic forms to evaluate cross-reactivity.
- Immunological assays to detect tumor-specific transplantation antigens (TATA).
Main Results:
- Each MC-induced sarcoma displayed a unique, stable, and heritable immunogenicity.
- No common or cross-reacting TATA were observed initially.
- Two sarcomas (CII-7, CII-10) in ascitic form showed cross-reactivity, potentially sharing TATA with each other and Meth A sarcoma.
- Other ascitic sarcomas retained their unique TATA.
Conclusions:
- Chemically induced sarcomas possess unique TATA that are stable and heritable.
- Tumor-specific transplantation antigens (TATA) exhibit significant diversity.
- Ascitic conversion can reveal cross-reacting TATA, suggesting shared antigens among certain tumors.
- Further research into TATA purification may elucidate mechanisms of antigen diversity in chemically induced cancers.
