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Growth factor-independent 1B gene (GFI1B) is overexpressed in erythropoietic and megakaryocytic malignancies and increases their proliferation rate.

Authors: Elmaagacli, AH  Koldehoff, M  Zakrzewski, JL  Steckel, NK  Ottinger, H  Beelen, DW 
Citation: Elmaagacli AH, etal., Br J Haematol. 2007 Jan;136(2):212-9. Epub 2006 Dec 8.
Pubmed: (View Article at PubMed) PMID:17156408
DOI: Full-text: DOI:10.1111/j.1365-2141.2006.06407.x

Growth factor-independent 1B (GFI1B) is a transcription factor essential for the development and differentiation of erythroid and megakaryocytic lineages. We evaluated the GFI1B expression in erythroleukaemia and megakaryocytic leukaemia, as well as in patients with other subtypes of acute myeloid leukaemia (AML), acute lymphoblastic leukaemia (ALL), chronic myeloid leukaemia (CML), myelodysplastic syndrome (MDS), severe aplastic anaemia (SAA), myelofibrosis with myeloid metaplasia (MMM) and in healthy volunteers. GFI1B expression was increased at least threefold in patients with erythroleukaemia (P < 0.01 compared with controls) and megakaryocytic leukaemia (P < 0.05) as well as in their corresponding leukaemic cell lines HEL, K562, CMK and M-07e. Patients with undifferentiated or monocytic AML, ALL, MMM, MDS and CML had no significantly altered GFI1B expression, whereas GFI1B expression was decreased 10-fold in patients with SAA (P < 0.0001 compared with controls). Silencing GFI1B by transfection with small interfering RNA (siRNA) markedly reduced the proliferation rate in the leukaemic cell lines HEL, K562 and NB4 (P < 0.01). Concomitantly, we observed a two- to threefold increase in the apoptosis rate in these cells after transfection with siRNA towards GFI1B. Our data indicate that GFI1B plays a major role in AML-M6 and AML-M7 and qualifies as a target for anti-leukaemic strategies in these malignancies.


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CRRD Object Information
CRRD ID: 11040507
Created: 2016-03-09
Species: All species
Last Modified: 2016-03-09
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.