Single-cell spatial transcriptomics reveals immunotherapy-driven bone marrow niche remodeling in AML.

Area of Science:

• Oncology
• Immunology
• Bioinformatics

Background:

• Allogeneic hematopoietic stem cell transplantation shows a graft-versus-leukemia effect in acute myeloid leukemia (AML).
• Immunotherapies are being explored for AML in non-transplant settings.
• Understanding immune interactions in the AML tumor microenvironment is crucial for developing novel therapies.

Purpose of the Study:

• To investigate bone marrow immune cell interactions in patients with AML treated with pembrolizumab and decitabine.
• To analyze the tumor microenvironment using a multiomic approach.
• To identify potential mechanisms of immunotherapy response in AML.

Main Methods:

• Multiomic analysis integrating single-cell RNA sequencing and spatial transcriptomics.
• Deep learning-based image analysis for transcript assignment and segmentation.
• Ligand-receptor analysis to identify cell-cell communication pathways.

Main Results:

• Pembrolizumab treatment led to global and local immune cell enrichment near leukemia cells.
• Quantification of cell-cell distances provided accurate tumor microenvironment analysis.
• Alterations in specific ligand-receptor signaling pathways between leukemia and immune cells were observed.

Conclusions:

• The study provides insights into immune interactions within the AML microenvironment following immunotherapy.
• Immune cell enrichment near leukemia cells may be linked to clinical response.
• Findings may inform future therapeutic strategies for AML.