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- W4377029146 abstract "<b>Abstract ID 27518</b> <b>Poster Board 242</b> The t(4;11)(q21;q23) chromosomal translocation that creates the MLL-AF4 fusion protein, confers a poor prognosis in infant acute lymphoblastic leukemia (ALL). This translocation also sensitizes cells to proteasome inhibitors bortezomib and carfilzomib, which are approved by the FDA for the treatment of multiple myeloma. Clinical activity of bortezomib in combination with standard chemotherapy has been documented in several clinical trials of ALL patients, and a case of a single-agent activity against relapsed leukemia driven by the MLL-AF4 translocation has been described. However, toxicities of bortezomib and carfilzomib may be unacceptable to pediatric patients. We found that the overwhelming majority of proteasomes in this subtype of ALL are lymphoid tissue specific immunoproteasomes. Cells with MLL-AF4 translocations were sensitive to pharmacologically relevant concentrations of specific immunoproteasome inhibitors ONX-0914 and M3258. Furthermore, both compounds dramatically delayed growth of orthotopic xenograft tumors in mice. Thus, immunoproteasomes are therapeutic targets in ALL and replacing bortezomib and carfilzomib with immunoproteasome inhibitors in ALL should reduce toxicities associated with inhibition of the proteasomes in non-lymphoid tissues. Support/Funding Information: RO1 CA213223" @default.
- W4377029146 created "2023-05-19" @default.
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- W4377029146 date "2023-05-18" @default.
- W4377029146 modified "2023-09-29" @default.
- W4377029146 title "Immunoproteasome Inhibitors for the treatment of ALL driven by the t(4:11) Translocation" @default.
- W4377029146 doi "https://doi.org/10.1124/jpet.122.275180" @default.
- W4377029146 hasPublicationYear "2023" @default.
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