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CY Thomas, VK Buxton, JS Roberts, BJ Boykin and D Innes
Department of Medicine, University of Virginia School of Medicine,
Charlottesville 22908.
Animals of the inbred mouse strain, CWD, express endogenous murine leukemia
viruses early in life and have a high incidence of spontaneous neoplasms.
We found that approximately one half of these animals died of malignant
lymphoma by the age of 16 months. Splenic enlargement was seen in all mice,
but thymic involvement was unusual. One half of the CWD tumors were diffuse
lymphoblastic or immunoblastic lymphomas while the remainder were large
cell, small cell, or mixed cell lymphomas. Analysis of DNAs from 12 tumors
for immunoglobulin and T-cell receptor gene rearrangements revealed that
all six of the lymphoblastic and immunoblastic lymphomas were of T-cell
origin, as was one tumor of small cleaved cells. Four of the others were
clonal B-cell lymphomas and one was of uncertain lineage. Assays of a
limited number of tumors for the expression of the Thy 1.2 and IgM
molecules confirmed the diversity in the cellular phenotype. The results
indicate that CWD mice develop primarily splenic lymphomas with an unusual
degree of heterogeneity in the tumor cell phenotypes as compared with the
thymic lymphomas found in other high leukemia strains. The CWD strain is a
useful new model for studies of retroviral leukemogenesis and the
relationship between the histopathology and immunophenotype of malignant
lymphomas.
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