Spontaneous and irradiation-induced tumor susceptibility in BRCA2 germline mutant mice and cooperative effects with a p53 germline mutation
| Autor: | Kimberly A. McAllister, Roger W. Wiseman, L. Michelle Bennett, Barbara J. Davis, Jason Malphurs, William Gersch, Laura Wharey, Toni Ward, Christopher D. Houle, Laura J. Betz, N. Keith Collins, John C. Seely |
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| Rok vydání: | 2006 |
| Předmět: |
Neoplasms
Radiation-Induced Time Factors Genotype 040301 veterinary sciences Mutant Bone Neoplasms Biology Toxicology 030226 pharmacology & pharmacy Germline Pathology and Forensic Medicine 0403 veterinary science 03 medical and health sciences Mice 0302 clinical medicine Germline mutation Fanconi anemia In vivo Stomach Neoplasms Neoplasms Radiation Ionizing medicine Carcinoma Animals Genetic Predisposition to Disease Molecular Biology Survival rate Germ-Line Mutation BRCA2 Protein Osteosarcoma 04 agricultural and veterinary sciences Cell Biology medicine.disease Genes p53 Phenotype Mice Mutant Strains Gene Expression Regulation Neoplastic Mice Inbred C57BL Survival Rate Cancer research Carcinoma Squamous Cell Female |
| Zdroj: | Toxicologic pathology. 34(2) |
| ISSN: | 0192-6233 |
| Popis: | Mutations in both p53 and BRCA2 are commonly seen together in human tumors suggesting that the loss of both genes enhances tumor development. To elucidate this interaction in an animal model, mice lacking the carboxy terminal domain of Brca2 were crossed with p53 heterozygous mice. Females from this intercross were then irradiated with an acute dose of 5 Gy ionizing radiation at 5 weeks of age and compared to nonirradiated controls. We found decreased survival and timing of tumor onsets, and significantly higher overall tumor incidences and prevalence of particular tumors, including stomach tumors and squamous cell carcinomas, associated with the homozygous loss of Brca2, independent of p53 status. The addition of a p53 mutation had a further impact on overall survival, incidence of osteosarcomas and stomach tumors, and tumor latency. The spectrum of tumors observed for this Brca2 germline mouse model suggest that it faithfully recapitulates some human disease phenotypes associated with BRCA2 loss. In addition, these findings include extensive in vivo data demonstrating that germline Brca2 and p53 mutations cooperatively affect animal survivals, tumor susceptibilities, and tumor onsets. |
| Databáze: | OpenAIRE |
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