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Development and tolerance of natural killer cells
1Department of Molecular and Cell Biology and Cancer Research Laboratory, 485 Life Sciences Addition, University of California, Berkeley, CA 94720-3200, USA. raulet@uclink4.berkeley.edu
Current Opinion in Immunology
|May 14, 1999
Summary
Natural killer (NK) cell development from fetal progenitor cells requires IL-15 for differentiation and MHC receptor expression. NK cells achieve self-tolerance through inhibitory receptor selection, anergy, and receptor level modulation.
Area of Science:
- Immunology
- Developmental Biology
- Cell Biology
Background:
- Natural killer (NK) cells are crucial immune cells originating from progenitor cells.
- Understanding NK cell differentiation and self-tolerance mechanisms is vital for immunology.
Purpose of the Study:
- To investigate the progenitor cells that give rise to NK cells.
- To explore the role of IL-15 in NK cell differentiation and receptor expression.
- To elucidate the mechanisms underlying NK cell self-tolerance.
Main Methods:
- Characterization of fetal blood progenitor cells with NK1.1(+) CD117 (c-kit)+ phenotype.
- Analysis of IL-15's role in NK cell differentiation and MHC-specific inhibitory receptor expression.
- Investigation of NK cell self-tolerance mechanisms, including receptor selection, anergy, and receptor modulation.
Main Results:
- A specific progenitor cell (NK1.1(+) CD117 (c-kit)+) in fetal blood can differentiate into NK cells.
- Interleukin-15 (IL-15) is likely essential for NK cell differentiation and upregulates MHC-specific inhibitory receptors.
- Multiple mechanisms, including receptor selection, anergy, and receptor level modulation, contribute to NK cell self-tolerance.
Conclusions:
- Fetal progenitor cells are the source of NK cells, with IL-15 driving their development.
- NK cell self-tolerance is established through a combination of inhibitory receptor-mediated selection and functional/regulatory mechanisms.