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Terminal deoxynucleotidyl transferase is found in prothymocytes
The Journal of Experimental Medicine
|August 1, 1976
Summary
Terminal deoxynucleotidyl transferase, an enzyme found in bone marrow, is linked to T-cell differentiation. Inducing the Thy-1 antigen on bone marrow cells with thymopoietin reduces terminal transferase, suggesting a shared lineage with thymocytes.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Terminal deoxynucleotidyl transferase (TdT) is a unique enzyme involved in DNA synthesis.
- TdT is present in both thymus and bone marrow cells across various species.
- The precise lineage of TdT-positive bone marrow cells remains unclear.
Purpose of the Study:
- To investigate the lineage of murine bone marrow cells expressing TdT.
- To determine if TdT-positive bone marrow cells share a common pathway with thymocytes.
Main Methods:
- Treatment of murine bone marrow cells with thymopoietin to induce Thy-1 antigen.
- Analysis of TdT levels in bone marrow cells after Thy-1 induction.
- Selective elimination of Thy-1-positive cells.
Main Results:
- Thymopoietin successfully induced the Thy-1 alloantigen on a subpopulation of bone marrow cells.
- Elimination of Thy-1-positive cells significantly reduced TdT levels in the bone marrow.
- Approximately half of the TdT-positive bone marrow cells were affected by this process.
Conclusions:
- Murine bone marrow cells containing TdT are, at least in part, related to thymocytes.
- TdT-positive bone marrow cells represent a population committed to T-cell differentiation.
- This study provides evidence for a shared developmental pathway between TdT-positive bone marrow cells and thymic cells.