The antiapoptotic gene A1/BFL1 is a WT1 target gene that mediates granulocytic differentiation and resistance to chemotherapy
Open Access
- 15 June 2006
- journal article
- Published by American Society of Hematology in Blood
- Vol. 107 (12) , 4695-4702
- https://doi.org/10.1182/blood-2005-10-4025
Abstract
Previous work has demonstrated that WT1 (–Ex5/–KTS) potentiates granulocyte colony-stimulating factor (G-CSF)–mediated granulocytic differentiation. This WT1 isoform suppresses cyclin E, which may contribute to the prodifferentiation effect by slowing proliferation, but WT1 target genes that affect survival might also be involved. We screened a cDNA array and identified the bCL2 family member A1/BFL1 as a new WT1 target gene in 32D cl3 murine myeloblast cells. Induction of WT1 (–Ex5/–KTS) expression is accompanied by up-regulation of A1 on the cDNA array, and this up-regulation was confirmed by semiquantitative reverse transcription–polymerase chain reaction (RT-PCR). Moreover, both promoter-reporter assays and chromatin immunoprecipitation assays suggest that this isoform of WT1 activates the promoter directly. Constitutive expression of A1 in 32D cl3 cells induces spontaneous granulocytic differentiation, with both morphologic and cell-surface antigen changes, as well as resistance both to chemotherapy and to withdrawal of interleukin-3 (IL-3). Finally, we note an association between WT1 expression and A1 expression in primary acute myeloid leukemia samples. Taken together, these results demonstrate that A1 is a new WT1 target gene involved in both granulocytic differentiation and resistance to cell death, and suggests that these genes might play an important role in the biology of high-risk leukemias.Keywords
This publication has 33 references indexed in Scilit:
- WT1 Induces Apoptosis through Transcriptional Regulation of the Proapoptotic Bcl-2 Family Member BakCancer Research, 2005
- An isoform of the Wilms' tumor suppressor gene potentiates granulocytic differentiationLeukemia, 2003
- Cyclin E Is a Target of WT1 Transcriptional RepressionJournal of Biological Chemistry, 2002
- The Wilms' tumor gene product represses the transcription of thrombospondin 1 in response to overexpression of c-JunOncogene, 1999
- Ornithine Decarboxylase Is a Transcriptional Target of Tumor Suppressor WT1Experimental Cell Research, 1999
- The WT1 Protein Is a Negative Regulator of the Normalbcl-2 Allele in t(14;18) LymphomasJournal of Biological Chemistry, 1997
- Subnuclear localization of WT1 in splicing or transcription factor domains is regulated by alternative splicingCell, 1995
- WT-1 is required for early kidney developmentCell, 1993
- Repression of the Insulin-Like Growth Factor II Gene by the Wilms Tumor Suppressor WT1Science, 1992
- Isolation and characterization of a zinc finger polypeptide gene at the human chromosome 11 Wilms' tumor locusCell, 1990