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Two monoclonal antibodies identify thymic-repopulating cells in mouse bone marrow
G J Spangrude1, J Klein, S Heimfeld
1Department of Pathology, Stanford University School of Medicine, CA 94305.
Journal of Immunology (Baltimore, Md. : 1950)
|January 15, 1989
Summary
Researchers identified specific bone marrow cells that repopulate the thymus. These thymic-repopulating cells express low Thy-1 and high Sca-1, aiding in understanding T-cell development.
Area of Science:
- Immunology
- Developmental Biology
- Hematopoiesis
Background:
- The origin of thymocytes, crucial for T-cell immunity, remains unclear.
- It's debated whether thymocytes arise directly from pluripotent stem cells or committed progenitors in the bone marrow.
Purpose of the Study:
- To identify and characterize bone marrow progenitor cells responsible for thymus repopulation.
- To distinguish between direct differentiation from pluripotent stem cells versus committed progenitors.
Main Methods:
- Utilized monoclonal antibodies (mAbs) targeting cell-surface antigens.
- Analyzed bone marrow cells from irradiated mice for their ability to repopulate the thymus.
- Discriminated cell populations based on Thy-1, Sca-1, Sca-2, and lineage-specific (Lin) markers.
Main Results:
- Identified thymic-repopulating cells in mouse bone marrow as Thy-1loSca-1+.
- Discovered two distinct Thy-1loSca-1+ populations: Thy-1loLin-Sca-1+ and Thy-1loLin+Sca-1+.
- Found that Sca-2 is expressed on Thy-1loLin+Sca-1+ but not Thy-1loLin-Sca-1+ cells.
- The Thy-1loLin-Sca-1+ fraction, enriched in pluripotent stem cells, contains thymic-repopulating capacity.
Conclusions:
- Sca-1 and Sca-2 are key markers for isolating thymic-repopulating bone marrow progenitor cells.
- These findings provide tools to study the developmental potential of specific bone marrow subsets.
- Clarifies the early stages of T-cell development originating from the bone marrow.