Published online July 14, 2008
doi:10.1083/jcb.200806069
The Journal of Cell Biology, Vol. 182, No. 1, 7-9
The Rockefeller University Press, 0021-9525 $30.00
© 2008 Di Fiore
Playing both sides: nucleophosmin between tumor suppression and oncogenesis
Pier Paolo Di Fiore
Istituto FIRC di Oncologia Molecolare (IFOM), 20139 Milan, Italy
Dipartimento di Medicina, Chirurgia ed Odontoiatria, Universitá degli Studi di Milano, 20122 Milan, Italy
Istituto Europeo di Oncologia, 20141 Milan, Italy
Correspondence to P.P. Di Fiore: pierpaolo.difiore{at}ifom-ieo-campus.it
Nucleophosmin (NPM) is frequently mutated in acute myeloid leukemias and is thought to act as both a proto-oncogene and a tumor suppressor. Although genetic and molecular evidence has shed light on the mechanisms of NPM-mediated tumor suppression, the potential role of NPM mutants as oncogenes remains ill defined. Now, new data provide a straightforward mechanism for this latter function, as NPM is shown to regulate the stability and the function of MYC. Remarkably, the same leitmotif of "placing a critical cell regulator in the wrong place at the wrong time" appears to underscore all the cancer-promoting activities of mutated NPM.
Abbreviations used in this paper: AML, acute myeloid leukemia; NPM, nucleophosmin.

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