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J Virol. 1987 December; 61(12): 3721-3725

Moloney murine leukemia virus-induced myeloid tumors in adult BALB/c mice: requirement of c-myb activation but lack of v-abl involvement.

Laboratory of Genetics, National Cancer Institute, Bethesda, Maryland 20892.

ABSTRACT

BALB/c mice treated with pristane and Abelson virus have been used as an animal model system for the rapid induction of plasmacytomas. Myelomonocytic tumors with helper Moloney murine leukemia virus clonally inserted into the c-myb locus were observed in about 10% of pristane-primed BALB/c mice infected with Abelson virus. However, v-abl was absent in almost all of those tumors. Since Moloney virus is thought to induce mostly T-cell lymphomas, we have carried out studies to investigate this alteration of disease specificity and to determine whether v-abl played an obligatory role in the development of these tumors. We found that, whereas lymphomas developed late (greater than 3 months) in both pristane-primed and unprinted control mice, the myelomonocytic tumors arose at a high frequency, within 3 months, but only in pristane-treated mice. Clonal Moloney virus insertion was again found in each of the seven myelomonocytic tumors examined. Northern blot analyses and S1 mapping studies revealed the presence of virally promoted chimeric mRNAs that lack the three 5'-most myb coding exons. Hence it appears that the requirement for the v-abl gene product in tumor induction is not obligatory. Our results also indicate that tumor-specific alteration at the 5' end of the myb gene plays an important role in the development of these tumors.

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