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Blood, 15 November 2005, Vol. 106, No. 10, pp. 3546-3552. Prepublished online as a Blood First Edition Paper on July 28, 2005; DOI 10.1182/blood-2005-02-0493.
NEOPLASIA A tumor-suppressor function for NFATc3 in T-cell lymphomagenesis by murine leukemia virusFrom the Department of Molecular Biology, University of Aarhus, Aarhus, Denmark; the Department of Molecular Pathology, Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany; Picobella, Burlingame, CA; the Department of Pathology, Okayama University Graduate School of Medicine and Dentistry, Okayama, Japan; the Laboratory of Tumor Pathology and Molecular Diagnostics, Institute of Biotechnology, Bay Zoltan Foundation for Applied Research, Szeged, Hungary; the Department of Microbiology and Immunology, University of California, San Francisco, CA; and the Department of Medical Microbiology and Immunology, University of Aarhus, Aarhus, Denmark.
Nuclear factor of activated T cell (NFAT) transcription factors play a central role in differentiation, activation, and elimination of lymphocytes. We here report on the finding of provirus integration into the Nfatc3 locus in T-cell lymphomas induced by the murine lymphomagenic retrovirus SL3-3 and show that NFATc3 expression is repressed in these lymphomas. The provirus insertions are positioned close to the Nfatc3 promoter or a putative polyadenylated RNA (polyA) region. Furthermore, we demonstrate that NFATc3-deficient mice infected with SL3-3 develop T-cell lymphomas faster and with higher frequencies than wild-type mice or NFATc2-deficient mice. These results identify NFATc3 as a tumor suppressor for the development of murine T-cell lymphomas induced by the retrovirus SL3-3.
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