A pre-B acute lymphoblastic leukemia cell line model reveals the mechanism of thalidomide therapy-related B-cell leukemogenesis.
J Biol Chem
; 300(8): 107578, 2024 Aug.
Article
in En
| MEDLINE
| ID: mdl-39029626
ABSTRACT
Lenalidomide, a thalidomide derivative, is prescribed as maintenance therapy for multiple myeloma (MM). Patients with MM receiving lenalidomide were found to develop a distinct therapy-related B cell acute lymphoblastic leukemia (B-ALL). However, the molecular mechanism by which lenalidomide drives B-ALL is unknown. We show that thalidomide treatment of B cell lines increased CD34 expression and fibronectin adhesion. This resembled the effects of Ikzf1 loss of function mutations in B-ALL. IKZF1 is a transcription factor that can act as both a transcriptional activator and a repressor depending upon the target loci. In our experiments, thalidomide-induced degradation of IKZF1 increased the expression of its transcriptional repression targets Itga5 and CD34 explaining the increased adhesion and stemness. Strikingly, withdrawal of thalidomide lead to the mis-localization of IKZF1 to the cytoplasm. Moreover, chromatin immunoprecipitation data showed a long-term effect of thalidomide treatment on IKZF1 target loci. This included decreased chromatin occupancy at early B cell factor 1 (EBF1) and Spi1 (PU.1). Consequently, B-cell lineage specifying transcription factors including Pax5, Spi1 and EBF1 were downregulated even after 7 days of thalidomide withdrawal. Our study thus provides a molecular mechanism of thalidomide-induced B-ALL whereby thalidomide alters the chromatin occupancy of IKZF1 at key B-cell lineage transcription factors leading to a persistent block in B-cell differentiation.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Thalidomide
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Precursor B-Cell Lymphoblastic Leukemia-Lymphoma
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Ikaros Transcription Factor
Limits:
Humans
Language:
En
Journal:
J Biol Chem
Year:
2024
Document type:
Article
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