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Immunocompetent cells among mouse thymocytes: a minor population
Science (New York, N.Y.)
|June 18, 1971
Summary
Thymus cell suspensions from TL(+) mice showed that TL(-) cells have greater graft versus host reactivity. This suggests TL(-) thymocytes are a differentiation stage toward immunocompetent lymphocytes.
Area of Science:
- Immunology
- Cell Biology
- Developmental Biology
Background:
- Thymus cell suspensions from TL(+) mice contain both TL(+) and TL(-) cells.
- The T lymphocyte (TL) antigen system plays a role in immune cell differentiation and function.
- Understanding thymocyte differentiation is crucial for comprehending adaptive immunity.
Purpose of the Study:
- To investigate the functional differences between TL(+) and TL(-) thymocytes.
- To determine the role of TL(-) cells in graft versus host reactions.
- To propose a model for thymocyte differentiation based on TL antigen expression.
Main Methods:
- Preparation of thymus cell suspensions from TL(+) mice.
- Assessment of graft versus host reactivity using Simonsen's assay.
- Quantification of splenic enlargement as a measure of reactivity.
Main Results:
- Thymus suspensions comprised a majority of TL(+) cells and a minority of TL(-) cells.
- The TL(-) cell population exhibited significantly higher graft versus host reactivity compared to the whole population.
- Fewer TL(-) cells were required to induce splenic enlargement in Simonsen's assay.
Conclusions:
- The TL(-) thymocyte population possesses greater immunocompetence.
- TL(-) thymocytes represent an intermediate differentiation stage.
- This stage precedes the development of TL(+) thymocytes into fully immunocompetent lymphocytes.