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ABSTRACT: Stemness-associated cell states are linked to chemotherapy resistance in acute myeloid leukemia (AML). We uncovered a direct mechanistic link between expression of the stem cell transcription factor GATA2 and drug resistance. The GATA-binding protein 2 (GATA2) plays a central role in blood stem cell generation and maintenance. We find substantial intrapatient and interpatient variability in GATA2 expression across samples from patients with AML. GATA2 expression varies by molecular subtype and has been linked to outcome. In a murine model, KMT2A-MLL3-driven AML originating from a stem cell or immature progenitor cell population has higher Gata2 expression and is more resistant to the standard AML chemotherapy agent doxorubicin. Deletion of Gata2 resulted in a more robust induction of p53 after exposure to doxorubicin. Chromatin immunoprecipitation sequencing, RNA sequencing, and functional studies revealed that GATA2 regulates the expression of RASSF4, a modulator of the p53 inhibitor MDM2 (mouse double minute 2). GATA2 and RASSF4 are anticorrelated in human cell lines and in bulk and single-cell expression data sets from patients with AML. Knockdown of Rassf4 in Gata2-low cells resulted in doxorubicin or nutlin-3 resistance. Conversely, overexpression of Rassf4 results in sensitization of cells expressing high levels of Gata2. Finally, doxorubicin and nutlin-3 are synergistic in Gata2-high murine AML and in samples from patients with AML. We discovered a previously unappreciated role for GATA2 in dampening p53-mediated apoptosis via transcriptional regulation of RASSF4, a modulator of MDM2. This role for GATA2 directly links the expression of a stemness-associated transcription factor to chemotherapy resistance.
Alikarami et al. (Wed,) studied this question.