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Acquired Mls-1a-like clonal deletion in Mls-1b mice
M Papiernik1, C Pontoux, S Gisselbrecht
1Institut Nationale de la Santé et de la Recherche Médicale (INSERM) U345, Hôpital Necker, Paris, France.
The Journal of Experimental Medicine
|February 1, 1992
Summary
Aging BALB/c mice exhibit acquired clonal deletion of T cells expressing specific T cell receptor genes. This phenomenon, likely induced by an external factor, impacts the T cell repertoire during aging.
Area of Science:
- Immunology
- T cell biology
- Aging research
Background:
- BALB/c mice show age-related changes in their T cell repertoire.
- Progressive deletion of T cells expressing V beta 6 and V beta 8.1 genes occurs in some mice.
Purpose of the Study:
- Investigate the mechanism and cause of age-related T cell clonal deletion in BALB/c mice.
- Determine if the deletion is genetically determined or environmentally induced.
Main Methods:
- Analysis of T cell populations in thymus, spleen, and lymph nodes of aging BALB/c mice.
- In vitro and in vivo experiments using thymic grafts and cell injections.
Main Results:
- Clonal deletion affects immature thymocytes expressing high levels of V beta 6.
- Deletion is not linked to known Mls-1a-like antigens or Mtv-7.
- Grafting newborn thymuses into aged mice induced deletion, suggesting an acquired factor.
Conclusions:
- Acquired clonal deletion, possibly triggered by a novel retrovirus or superantigen, is a significant age-related immune event.
- This phenomenon highlights the plasticity of the T cell repertoire in response to environmental factors.