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SIRPα+ PD-L1+ bone marrow macrophages aid AML growth by modulating T cell function
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SIRPα+ PD-L1+ bone marrow macrophages aid AML growth by modulating T cell function
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Paper
SIRPα+ PD-L1+ bone marrow macrophages aid AML growth by modulating T cell function
2024
Overview
Acute myeloid leukemia (AML) continues to have a poor prognosis due to its ability to relapse following initial response to chemotherapy. While immunotherapies hold the promise to revolutionize cancer treatment, AML has been particularly challenging to target. It is therefore important to better understand the relationship between AML cells and immune cells within the bone marrow (BM) microenvironment, where this disease grows. Here we focus on non-malignant BM macrophages, and using a combination of intravital microscopy, flow cytometry, transcriptomics and functional analyses we identify a subpopulation of immunomodulatory BM macrophages (IMMs) with a unique profile and function during AML progression. While the majority of macrophages are already being lost at early infiltration, IMMs are locally enriched. They are capable of efferocytosis and support AML growth through inhibition of T cells. Enrichment of IMMs in the BM of patients developing early relapse indicates that future development of interventions that target IMMs’ development and function may improve AML patients’ outcome.
Publisher
Cold Spring Harbor Laboratory
Subject
