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Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, P.H.S.
The oncogenic fusion protein nucleophosmin-anaplastic lymphoma kinase (NPM-ALK) induces two distinct malignant phenotypes in a murine retroviral transplantation model.
Oncogene 2003 July 25
A t(2;5) (p23;q35) chromosomal translocation can be found in a high percentage of anaplastic large-cell lymphomas (ALCL). This genetic abnormality leads to the expression of the NPM-ALK fusion protein, which encodes a constitutively active tyrosine kinase that plays a causative role in lymphomagenesis. Employing a modified infection/transplantation protocol utilizing an MSCV-based vector, we were able to reproducibly induce two phenotypically different lymphoma-like diseases dependent on the retroviral titers used. The first phenotype presented as a polyclonal histiocytic malignancy of myeloid/macrophage origin with a short latency period of 3-4 weeks. Clinically, the diseased mice showed rapidly progressive wasting, lymphadenopathy and pancytopenia. Mice displaying the second phenotype developed monoclonal B-lymphoid tumors with a longer latency of approximately 12-16 weeks, primarily involving the spleen and the bone marrow, with less extensive lymph node but also histologically evident extranodal organ infiltration by large immature plasmoblastic cells. The described retroviral mouse model will be useful to analyse the role of NPM-ALK in lymphomagenesis in vivo and may contribute to the development of new treatment options for NPM-ALK induced malignancies.
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