Deletion of chromosome 2 is an early event in the development of radiation-induced myeloid leukemia in SJL/J mice - PubMed (original) (raw)
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- PMID: 3166080
Deletion of chromosome 2 is an early event in the development of radiation-induced myeloid leukemia in SJL/J mice
L Trakhtenbrot et al. Leukemia. 1988 Aug.
Abstract
In this study we have analyzed the chromosomal changes in the preleukemic phase in SJL/J mice treated with radiation and acute myeloid leukemias (AMLs) induced by radiation alone or with additional corticosteroid treatment. SJL/J mice exposed to 300 rad whole body irradiation developed a low incidence of AML (20-25%) that could be markedly increased (to 50-70%) by additional coleukemogenic treatment with corticosteroids. Partial deletion in one chromosome 2 was found in 100% of bone marrow and spleen cells of leukemic animals in both treatment modalities, whereas the age-matched controls exhibited a normal karyotype. Five types of deletion were observed according to site and size, but region D through G was the common missing part in all five types of chromosome 2 deletion. The occurrence of chromosome 2 deletion was also tested among bone marrow cells removed from 17 mice, 4 months after exposure to 300 rad whole body irradiation, long before the time when AML development is expected. About 80% of the mice tested had different levels of deleted chromosome 2 among their bone marrow population. Cytological and histological examination of bone marrow and spleen of most tested animals showed a normal hematologic picture. These results suggest that the marker chromosome is related to the process of radiation-induced initiation of AML in SJL/J mice.
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