Abstract
Rearrangments in Histone-lysine-N-methyltransferase 2A (KMT2Ar) are associated with pediatric, adult and therapy-induced acute leukemias. Infants with KMT2Ar acute lymphoblastic leukemia (ALL) have a poor prognosis with an event-free-survival of 38%. Herein we evaluate 1116 FDA approved compounds in primary KMT2Ar infant ALL specimens and identify a sensitivity to proteasome inhibition. Upon exposure to this class of agents, cells demonstrate a depletion of histone H2B monoubiquitination (H2Bub1) and histone H3 lysine 79 dimethylation (H3K79me2) at KMT2A target genes in addition to a downregulation of the KMT2A gene expression signature, providing evidence that it targets the KMT2A transcriptional complex and alters the epigenome. A cohort of relapsed/refractory KMT2Ar patients treated with this approach on a compassionate basis had an overall response rate of 90%. In conclusion, we report on a high throughput drug screen in primary pediatric leukemia specimens whose results translate into clinically meaningful responses. This innovative treatment approach is now being evaluated in a multi-institutional upfront trial for infants with newly diagnosed ALL.
| Original language | English |
|---|---|
| Pages (from-to) | 809 |
| Journal | Nature Communications |
| Volume | 14 |
| Issue number | 1 |
| DOIs | |
| State | Published - Feb 13 2023 |
Bibliographical note
© 2023. The Author(s).Funding
The authors thank all the members of the St Jude Children’s Research Hospital for their support. We specifically thank the staff of the Animal Resource Center, Tissue Resources Laboratory, Flow Cytometry and Cell Sorting Core, Cell and Tissue Imaging, Proteomics & Metabolomics, and the Hartwell Center for Biotechnology and Bioinformatics. This work was supported by grants from the V Foundation, and the American Lebanese Syrian Associated Charities (ALSAC) of St. Jude Children’s Research Hospital. The authors thank all the members of the St Jude Children’s Research Hospital for their support. We specifically thank the staff of the Animal Resource Center, Tissue Resources Laboratory, Flow Cytometry and Cell Sorting Core, Cell and Tissue Imaging, Proteomics & Metabolomics, and the Hartwell Center for Biotechnology and Bioinformatics. This work was supported by grants from the V Foundation, and the American Lebanese Syrian Associated Charities (ALSAC) of St. Jude Children’s Research Hospital.
Keywords
- Infant
- Adult
- Humans
- Child
- Proteasome Endopeptidase Complex/genetics
- Lysine/genetics
- Myeloid-Lymphoid Leukemia Protein/genetics
- Precursor Cell Lymphoblastic Leukemia-Lymphoma/drug therapy
- Transcriptome
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