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Screening mouse mutations for resistance to cancer metastasis
O S Egorov1, Y Liu, E E Sargent
1Jackson Laboratory, Bar Harbor, ME 04609.
Abstract:
To search for host genes for resistance/susceptibility to cancer metastasis, mutation analysis was employed. Ten putative mutants of resistance to lymphoma EL4 and four putative mutants of resistance to sarcoma MCA/77-23 of C57BL/6J (B6) mice were produced. These mutants were designated S (for "survivor") mutants; they do not reject parental strain B6 skin grafts. S-mutants resist moderate tumor cell doses: TD50 values in them were increased by a factor of 12 to 600. Genetic linkage tests showed that five S-mutants were linked to mouse major histocompatibility complex (H-2) and five other S-mutants were not linked to this locus. A group of H-2-linked S-mutants resisting EL4 and a mutant, S-87/2, resisting MCA/77-23 were tested for resistance to spontaneous metastases of the same two tumors, EL4 and MCA/77-23. Two of the mutants, S-31 (lymphoma-resisting) and S-87/2 (sarcoma-resisting), were shown to carry mutations of mouse gene(s) for resistance to tumor metastases. In both of these mutants resistance to the original tumor transplant coexisted with highly increased susceptibility to metastasis. These mutants are a new tool to study genes for resistance to cancer metastasis and of mechanism of resistance controlled by each individual gene.
Insights
Researchers identified new mouse mutants that reveal critical genes controlling cancer metastasis. These "survivor" mutants offer a novel tool for understanding how specific genes influence tumor spread and host resistance.
Area of Science:
- Immunogenetics
- Cancer Biology
- Genetics
Background:
- Identifying host genes that regulate cancer metastasis is crucial for developing new therapies.
- Previous studies have utilized mouse models to investigate genetic factors influencing tumor progression.
Purpose of the Study:
- To identify and characterize host genes involved in resistance and susceptibility to cancer metastasis.
- To generate and analyze mouse mutants with altered responses to lymphoma and sarcoma metastasis.
Main Methods:
- Mutation analysis was performed on C57BL/6J mice to produce ten lymphoma-resistant and four sarcoma-resistant mutants (S-mutants).
- Genetic linkage tests were conducted to determine the association of S-mutant genes with the mouse major histocompatibility complex (H-2).
- Selected mutants were tested for resistance to spontaneous metastases of EL4 lymphoma and MCA/77-23 sarcoma.
Main Results:
- Five S-mutants showed linkage to the H-2 locus, while five others did not.
- Mutants S-31 (lymphoma-resisting) and S-87/2 (sarcoma-resisting) were identified as carrying mutations affecting genes for tumor metastasis resistance.
- These identified mutants exhibited resistance to primary tumor growth but increased susceptibility to metastasis.
Conclusions:
- The identified S-mutants represent a valuable new resource for studying genes that confer resistance to cancer metastasis.
- These mutants facilitate the investigation of mechanisms underlying gene-controlled resistance to tumor metastasis.
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