MRC2 expression modulates metabolism in acute myeloid leukemia stem cells

Area of Science:

• Hematology
• Cancer Biology
• Molecular Oncology

Background:

• Leukemic stem cells (LSCs) drive acute myeloid leukemia (AML) initiation and relapse.
• Significant phenotypic heterogeneity exists among AML LSCs, complicating their identification.
• Cell surface markers are crucial for distinguishing LSCs from other AML cells.

Purpose of the Study:

• To identify novel cell surface markers for enriching LSCs across diverse AML subtypes.
• To investigate the functional role of identified markers in LSC biology.
• To understand the mechanisms by which LSCs maintain their stemness and disease-driving capacity.

Main Methods:

• Analysis of primary patient AML samples.
• Flow cytometry for cell surface marker expression (MRC2).
• In vitro functional assays (clonogenic capacity).
• Transcriptomic profiling for stemness signatures.
• Mouse xenograft models for in vivo leukemia capacity assessment.
• Functional studies on MRC2-mediated collagen uptake and metabolism.

Main Results:

• Mannose receptor C-type 2 (MRC2) expression enriches for LSCs in various AML subtypes.
• MRC2+ AML cells demonstrate superior in vitro clonogenic capacity.
• MRC2+ LSCs exhibit a stemness transcriptomic signature.
• MRC2+ LSCs show enhanced leukemia development in mouse xenograft models.
• MRC2 is functional, mediating collagen uptake that supports LSC glycolytic metabolism.

Conclusions:

• MRC2 serves as a reliable marker for enriching LSCs in AML.
• MRC2 expression is linked to key stem cell properties and enhanced leukemia capacity.
• Understanding MRC2 function provides insights into LSC metabolism and survival.
• Functional surface markers like MRC2 are valuable for distinguishing LSCs and understanding their unique characteristics in AML.