3 Key Takeaways
Plain English Summary- 01Core Finding
EMPROR cells are phenotypically and transcriptionally distinct from hematopoietic stem cells, common myeloid progenitors and monocyte precursors, lacking Csf1r and Ccr2 while expressing Cd4 and Kit.
- 02Study Evidence
Tested in a observational cohort study at the real-world cohort stage.
- 03Practical Meaning
Observational cohort findings reveal real-world links, though lifestyle or unmeasured factors cannot be fully ruled out without an RCT.
What This Means for You
Transcriptomic comparisons position EMPROR cells closest to embryonic erythro-myeloid progenitors, indicating the persistence of an embryonic-like program in adult bone marrow. These findings reveal an alternative pathway of adult myelopoiesis that sustains macrophage diversity beyond the classical monocyte lineage.
The Discovery
Tissue-resident macrophages originate from distinct developmental sources, but their adult replenishment is thought to depend exclusively on circulating monocytes. Here we identify a previously unrecognized CD4-lineage erythro-myeloid progenitor (EMPROR) in the adult bone marrow that provides an alternative pathway for macrophage generation. EMPROR cells are phenotypically and transcriptionally distinct from hematopoietic stem cells, common myeloid progenitors and monocyte precursors, lacking Csf1r and Ccr2 while expressing Cd4 and Kit. Single-cell RNA sequencing, RNA velocity analysis and lineage assays reveal macrophage, neutrophil, megakaryocytic and erythroid potential. EMPROR cells generate perivascular and tumor-associated macrophages independently of CCR2-mediated monocyte recruitment and contribute to erythroid and granulocytic lineages under inflammatory and neoplastic conditions.
How It Works, Simply
This immunology research focuses on inflammation · Stem cells · Signalling pathway. Researchers evaluated it using an observational cohort study at the real-world cohort stage of medical research.
3 Key Takeaways
Clinical Takeaways- 01Core Finding
EMPROR cells are phenotypically and transcriptionally distinct from hematopoietic stem cells, common myeloid progenitors and monocyte precursors, lacking Csf1r and Ccr2 while expressing Cd4 and Kit.
- 02Study Evidence
Tested in a observational cohort study at the real-world cohort stage.
- 03Practical Meaning
Observational cohort findings reveal real-world links, though lifestyle or unmeasured factors cannot be fully ruled out without an RCT.
Biological Mechanism & Study Design
Study Design & Cohort
Observational cohort study
Observational cohort study · Real-World Cohort
Biological Pathway & Modality
Inflammation · Stem cells · Signalling pathway
Intervention: A CD4-lineage erythro-myeloid progenitor within the adult bone marrow defines an
Experimental Findings & Endpoints
Tissue-resident macrophages originate from distinct developmental sources, but their adult replenishment is thought to depend exclusively on circulating monocytes.
Here we identify a previously unrecognized CD4-lineage erythro-myeloid progenitor (EMPROR) in the adult bone marrow that provides an alternative pathway for macrophage generation. EMPROR cells are phenotypically and transcriptionally distinct from hematopoietic stem cells, common myeloid progenitors and monocyte precursors, lacking Csf1r and Ccr2 while expressing Cd4 and Kit.
Single-cell RNA sequencing, RNA velocity analysis and lineage assays reveal macrophage, neutrophil, megakaryocytic and erythroid potential. EMPROR cells generate perivascular and tumor-associated macrophages independently of CCR2-mediated monocyte recruitment and contribute to erythroid and granulocytic lineages under inflammatory and neoplastic conditions.
Clinical Translation & Practice Context
Transcriptomic comparisons position EMPROR cells closest to embryonic erythro-myeloid progenitors, indicating the persistence of an embryonic-like program in adult bone marrow.
These findings reveal an alternative pathway of adult myelopoiesis that sustains macrophage diversity beyond the classical monocyte lineage.
The Bottom Line · Clinical Pearl
“These findings reveal an alternative pathway of adult myelopoiesis that sustains macrophage diversity beyond the classical monocyte lineage.”
Published in Nature Immunology · Current Stage: Real-World Cohort
