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NUP98 Dysregulation in Myeloid Leukemogenesis
Author(s) -
MOORE M. A. S.,
CHUNG K. Y.,
PLASILOVA M.,
SCHURINGA J. J.,
SHIEH J.H.,
ZHOU P.,
MORRONE G.
Publication year - 2007
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1196/annals.1392.019
Subject(s) - cancer research , myeloid leukemia , myeloid , biology , haematopoiesis , homeobox , cd34 , progenitor cell , leukemia , chromosomal translocation , fusion protein , stem cell , bone marrow , myelopoiesis , stromal cell , fusion gene , microbiology and biotechnology , immunology , gene expression , gene , genetics , recombinant dna
Nucleoporin 98 (NUP98) is a component of the nuclear pore complex that facilitates mRNA export from the nucleus. It is mapped to 11p15.5 and is fused to a number of distinct partners, including nine members of the homeobox family as a consequence of leukemia‐associated chromosomal translocations. NUP98‐HOXA9 is associated with the t(7;11)(p15;p15) translocation in acute myeloid leukemia (AML), myelodysplastic syndrome, and blastic crisis of chronic myeloid leukemia. Expression of NUP98‐HOXA9 in murine bone marrow resulted in a myeloproliferative disease progressing to AML by 7–8 months. Transduction of NUP98 fusion genes into human CD34 + cells confers a proliferative advantage in long‐term cytokine‐stimulated and stromal cocultures and in NOD‐SCID engrafted mice, associated with a five‐ to eight‐fold increase in hematopoietic stem cells. NUP98‐HOXA9 expression inhibited erythroid and myeloid differentiation but enhanced serial progenitor replating. NUP98‐HOXA9 upregulated a number of homeobox genes of the A and B cluster as well as MEIS1 and Pim‐1, and downmodulated globin genes and C/EBPα. The HOXA9 component of the NUP98‐HOXA9 fusion protein was protected from cullin‐4A–mediated ubiquitination and subsequent proteasome‐dependent degradation. In NUP98‐HOX–transduced CD34 + cells and cells from AML patients with t(7;11)(p15;p15) NUP98 was no longer associated with the nuclear pore complex but formed intranuclear aggregation bodies. Analysis of NUP98 allelic expression in AML and myelodysplastic syndrome showed loss of heterozygosity observed in 29% of the former and 8% of the latter. This was associated with poor prognosis.