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Immunogenicity and cross-reactivity of syngeneic murine melanomas
1Department of Immunology, University of Texas M.D. Anderson Cancer Center, Houston 77030.
Abstract:
Non-melanoma skin cancers induced in mice by chemical carcinogens or ultraviolet radiation are often antigenic but rarely induce cross-protective immunity when tested by in vivo transplantation methods. We wished to determine whether melanocytic skin tumors behave similarly or whether they exhibit cross-reactive antigens in vivo. Three melanomas induced in C3H/HeNCr(MTV-) mice by initiation with ultraviolet radiation and promotion with croton oil or initiation with 7,12-dimethyl-benz[a]anthracene and promotion with 12-O-tetradecanoyl-phorbol-13-acetate or croton oil plus ultraviolet radiation were tested for immunogenicity and cross-reactivity in vivo. The three melanomas were highly immunogenic, and all induced some degree of protection against the other melanomas. Non-melanoma skin cancers induced by the same carcinogens were less immunogenic and did not immunize against the melanomas. We conclude that unlike other skin cancers, melanocytic tumors induced by chemical carcinogens and ultraviolet radiation are highly cross-reactive in vivo and thus represent a unique subset of murine skin cancers.
Insights
Murine melanomas induced by carcinogens show unique cross-protective immunity. Unlike other skin cancers, these melanomas are highly immunogenic and protect against each other, suggesting unique tumor antigens.
Area of Science:
- Oncology
- Immunology
- Dermatology
Background:
- Non-melanoma skin cancers are antigenic but rarely induce cross-protective immunity.
- Melanocytic skin tumors' cross-reactivity in vivo remains largely uncharacterized.
Purpose of the Study:
- To investigate the immunogenicity and in vivo cross-reactivity of chemically and ultraviolet-radiation-induced murine melanomas.
- To compare the immune response elicited by melanomas versus non-melanoma skin cancers.
Main Methods:
- Three distinct murine melanomas were induced using chemical carcinogens and/or ultraviolet radiation.
- Tumor immunogenicity and cross-protective immunity were assessed using in vivo transplantation assays.
- Comparison of immune responses between melanomas and non-melanoma skin cancers.
Main Results:
- All three induced melanomas were highly immunogenic.
- Each melanoma conferred a degree of protection against the others, indicating significant cross-reactivity.
- Non-melanoma skin cancers induced by similar methods showed lower immunogenicity and lacked cross-protection against melanomas.
Conclusions:
- Murine melanocytic tumors induced by carcinogens and UV radiation exhibit significant in vivo cross-reactivity.
- This cross-reactivity distinguishes melanomas from other murine skin cancers.
- Melanomas represent a unique subset of skin cancers with distinct immunological properties.