Monocytes Promote cHSPC Expansion via MIF-CXCR4-ATP6V1A Axis
Human circulating hematopoietic stem and progenitor cells in steady-state blood expand through an MIF-dependent mechanism.
Key Clinical Takeaways:
- Monocytes most effectively promote circulating hematopoietic stem and progenitor cell expansion while preserving long-term reconstitution.
- Cells engage the MIF-(CXCR4_CD74)-ATP6V1A axis to enhance endocytosis, lysosomal acidification, and glycolytic activity.
- Monocyte co-culture and pathway agonists successfully expanded stem and progenitor cells from cord blood, bone marrow, and patient samples.
Stem Cell Expansion Limitations
Steady-state human circulating hematopoietic stem and progenitor cells remain a rare and underutilized resource for clinical transplantation. Poor ex vivo expansion capacity and unclear regulatory pathways have previously limited their use in therapies.
Immune Cell Screening Platform
Researchers utilized an immune-cell screening platform to identify which cell types best support stem cell growth. The screening revealed that monocytes promote hematopoietic stem and progenitor cell expansion most effectively. This co-culture approach preserves long-term hematopoietic reconstitution during serial transplantation.
Stem Cells Engage the MIF-(CXCR4_CD74)-ATP6V1A Axis to Maintain Stemness
Mechanistically, circulating stem and progenitor cells engage the MIF-(CXCR4_CD74)-ATP6V1A axis. This engagement enhances endocytosis and lysosomal acidification. The process subsequently upregulates CD34+CXCR4+ cells, reduces reactive oxygen species, stabilizes HIF-1α, and maintains both glycolytic activity and stemness.
Universal Expansion Strategy
Monocyte co-culture or specific pathway agonists—including MIF and EN6—successfully expanded stem and progenitor cells from diverse sources. These sources include steady-state peripheral blood, cord blood, bone marrow, and poor-graft-function patient samples. The mechanism provides a universal expansion strategy for functionally compromised hematopoietic cells.
Disclaimer: The information provided in this article is for educational and scientific communication purposes only and does not constitute medical advice. Always consult with a qualified healthcare provider regarding any medical condition, diagnosis, or treatment plan.