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A Culture Method to Maintain Quiescent Human Hematopoietic Stem Cells
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Quiescent Tissue Stem Cells Evade Immune Surveillance
Judith Agudo1, Eun Sook Park2, Samuel A Rose2
1Precision Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
Immunity
|February 22, 2018
Summary
Quiescent stem cells evade immune attack by downregulating antigen presentation, unlike cycling stem cells. This immune evasion mechanism, mediated by NLRC5, protects stem cells and may explain early cancer cell immune surveillance evasion.
Area of Science:
- Immunology
- Stem Cell Biology
- Cancer Research
Background:
- Stem cells are vital for tissue maintenance.
- The interaction between stem cell immunity and immune system remains unclear.
- Understanding stem cell immune evasion is crucial for regenerative medicine and cancer research.
Purpose of the Study:
- To investigate the susceptibility of different stem cell populations to immune attack.
- To elucidate the mechanisms underlying stem cell immune evasion.
- To explore the implications of stem cell immune evasion in cancer development.
Main Methods:
- Comparative analysis of stem cell responses to activated T cells.
- Investigation of antigen presentation machinery (MHC class I, TAP) in quiescent vs. cycling stem cells.
- Role of NLRC5 transactivator in mediating immune evasion.
Main Results:
- Cycling stem cells (intestinal, ovarian, mammary) were eliminated by T cells.
- Quiescent stem cells (hair follicle, muscle) exhibited resistance to T cell-mediated killing.
- Immune evasion in quiescent stem cells is an intrinsic property due to downregulated antigen presentation machinery, including MHC class I and TAP proteins, mediated by NLRC5.
- This immune evasion was reversed upon stem cell cycle entry.
Conclusions:
- A direct link exists between stem cell quiescence, antigen presentation, and immune evasion.
- Quiescent stem cells possess an intrinsic mechanism to evade immune surveillance.
- These findings may explain how early cancer cells, potentially derived from stem cells, evade immune detection.
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