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Possible role of Abb gene in mouse resistance to EL4 metastases
O S Egorov1, Y Liu, I K Egorov
1Jackson Laboratory, Bar Harbor, ME 04609.
Abstract:
"S" (survivor) mutants were produced in mice for genetic analysis of host resistance to metastatic cancers. S-mutants S-27 and S-31 resist transplantation of lymphoma EL4 of parental C57BL/6J (B6) mice while they accept parental skin grafts. Mutant S-27 also resists formation of spontaneous metastases from intradermally growing EL4 tumor into lymph nodes; mutant S-31 is highly susceptible to EL4 metastases. Another mutant, H-2bm26 (bm26), resists EL4 and rejects B6 skin grafts. Major histocompatibility complex (MHC) class I and class II gene expression was compared in these mutants and normal B6 mice. All three mutants tested, S-27, S-31, and bm26, expressed a low amount of Kb mRNA in organ-specific fashion. Mutants bm26 and S-31 expressed a low amount of Abb mRNA and of Ab antigen on their spleen cells. Some oligonucleotide probes designed to hybridize to the second exon of the class II MHC gene Abb did not hybridize with DNA from all three mutants. These findings suggest extensive sequence alterations in the Abb gene in mutants S-27, S-31, and bm26; they also suggest a major role of MHC in the control of host resistance to spontaneous metastases of the EL4 tumor.
Insights
Genetic analysis of "survivor" (S) mouse mutants reveals major histocompatibility complex (MHC) involvement in controlling cancer metastasis. Specific MHC alterations in S-mutants impact resistance to lymphoma and spontaneous tumor spread.
Area of Science:
- Immunogenetics
- Cancer Biology
- Mouse Models
Background:
- Genetic analysis of host resistance to metastatic cancers is crucial for understanding tumor progression.
- Survivor (S) mouse mutants were generated to investigate genetic factors influencing cancer metastasis.
- Previous studies established the role of the Major Histocompatibility Complex (MHC) in immune responses and cancer surveillance.
Purpose of the Study:
- To genetically analyze host resistance to metastatic cancers using novel 'survivor' (S) mouse mutants.
- To compare Major Histocompatibility Complex (MHC) class I and class II gene expression in S-mutants and normal mice.
- To determine the role of MHC in controlling spontaneous metastases of EL4 lymphoma.
Main Methods:
- Production and characterization of 'survivor' (S) mouse mutants resistant to cancer transplantation.
- Assessment of tumor transplantation and skin graft acceptance in S-mutants and H-2bm26 mutant mice.
- Analysis of Major Histocompatibility Complex (MHC) class I (Kb) and class II (Ab) gene expression using mRNA and DNA hybridization techniques.
Main Results:
- S-mutants S-27 and S-31 resisted EL4 lymphoma transplantation but accepted skin grafts.
- Mutant S-27 resisted spontaneous EL4 metastases, while S-31 was highly susceptible.
- All tested mutants (S-27, S-31, bm26) showed low Kb mRNA expression and sequence alterations in the Ab gene, suggesting significant MHC gene modifications.
Conclusions:
- Major Histocompatibility Complex (MHC) plays a critical role in host resistance to spontaneous cancer metastases.
- Specific alterations in MHC class I and class II genes influence susceptibility to lymphoma metastasis.
- Survivor (S) mutants provide valuable models for dissecting the genetic control of cancer metastasis and immune surveillance.