Identification and characterization of a nuclear interacting partner of anaplastic lymphoma kinase (NIPA).
Anaplastic large-cell lymphoma is a subtype of non-Hodgkin lymphomas characterized by the expression of CD30. More than half of these lymphomas carry a chromosomal translocation t(2;5) leading to expression of the oncogenic tyrosine kinase nucleophosmin-anaplastic lymphoma kinase (NPM-ALK). NPM-ALK is capable of transforming fibroblasts and lymphocytes in vitro and of causing lymphomas in mice. Previously, we and others demonstrated phospholipase C-gamma and phosphatidylinositol 3-kinase as crucial downstream signaling mediators of NPM-ALK-induced oncogenicity. In this study, we used an ALK fusion protein as bait in a yeast two-hybrid screen identifying NIPA (nuclear interacting partner of ALK) as a novel downstream target of NPM-ALK. NIPA encodes a 60-kDa protein that is expressed in a broad range of human tissues and contains a classical nuclear translocation signal in its C terminus, which directs its nuclear localization. NIPA interacts with NPM-ALK and other ALK fusions in a tyrosine kinase-dependent manner and is phosphorylated in NPM-ALK-expressing cells on tyrosine and serine residues with serine 354 as a major phosphorylation site. Overexpression of NIPA in Ba/F3 cells was able to protect from apoptosis induced by IL-3 withdrawal. Mutations of the nuclear translocation signal or the Ser-354 phosphorylation site impaired the antiapoptotic function of NIPA. In NPM-ALK-transformed Ba/F3 cells, apoptosis triggered by wortmannin treatment was enhanced by overexpression of putative dominant-negative NIPA mutants. These results implicate an antiapoptotic role for NIPA in NPM-ALK-mediated signaling events.
Ouyang
Tao
T
Department of Internal Medicine III, Laboratory of Leukemogenesis, Technical University of Munich, 81675 Munich, Germany.
Bai
Ren-Yuan
RY
Bassermann
Florian
F
von Klitzing
Christine
C
Klumpen
Silvia
S
Miething
Cornelius
C
Morris
Stephan W
SW
Peschel
Christian
C
Duyster
Justus
J
D021581:Active Transport, Cell Nucleus; D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D000730:Androstadienes / Q000494:pharmacology; D000818:Animals; D017209:Apoptosis; D015152:Blotting, Northern; D019556:COS Cells; D002453:Cell Cycle; D018797:Cell Cycle Proteins; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005347:Fibroblasts / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D006801:Humans; D015151:Immunoblotting; D020287:In Situ Nick-End Labeling; D017730:Ki-1 Antigen / Q000096:biosynthesis; D016403:Lymphoma, Large B-Cell, Diffuse / Q000378:metabolism*; D051379:Mice; D008856:Microscopy, Fluorescence; D008954:Models, Biological; D008969:Molecular Sequence Data; D009154:Mutation; D009687:Nuclear Proteins / Q000737:chemistry* / Q000378:metabolism*; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism*; D019606:Phosphoamino Acids / Q000378:metabolism; D051966:Phospholipase C gamma; D010766:Phosphorylation; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D011505:Protein-Tyrosine Kinases / Q000737:chemistry / Q000378:metabolism*; D012333:RNA, Messenger / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D012694:Serine / Q000737:chemistry; D015398:Signal Transduction; D013997:Time Factors; D014018:Tissue Distribution; D014162:Transfection; D020798:Two-Hybrid System Techniques; D010738:Type C Phospholipases / Q000737:chemistry*; D014443:Tyrosine / Q000737:chemistry; D000077191:Wortmannin
D048868:Adaptor Proteins, Signal Transducing; D000730:Androstadienes; D018797:Cell Cycle Proteins; D018076:DNA, Complementary; D004791:Enzyme Inhibitors; D017730:Ki-1 Antigen; C477289:NIPA protein, mouse; D009687:Nuclear Proteins; D019606:Phosphoamino Acids; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; C477288:ZC3HC1 protein, human; D014443:Tyrosine; D012694:Serine; D005982:Glutathione Transferase; D019869:Phosphatidylinositol 3-Kinases; C107023:p80(NPM-ALK) protein; D011505:Protein-Tyrosine Kinases; D010738:Type C Phospholipases; D051966:Phospholipase C gamma; D000077191:Wortmannin