CD45 regulates apoptosis in peripheral T lymphocytes

Programmed cell death (apoptosis) is a key mechanism for regulating lymphocyte numbers. Murine lymph node lymphocytes cultured in vitro without added stimuli show significant levels of apoptosis over 24 h, detectable by staining with Annexin V. CD4 and CD8 T lymphocytes from transgenic (Tg) mice exp...

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Bibliographic Details
Published in:International immunology 2006-06, Vol.18 (6), p.959-966
Main Authors: Liu, Zhe, Dawes, Ritu, Petrova, Svetla, Beverley, Peter CL, Tchilian, Elma Z
Format: Article
Language:English
Subjects:
Alleles
Animals
annexin
Apoptosis - genetics
Apoptosis - immunology
CD4-Positive T-Lymphocytes - cytology
CD4-Positive T-Lymphocytes - immunology
CD8-Positive T-Lymphocytes - cytology
CD8-Positive T-Lymphocytes - immunology
cell survival
Cells, Cultured
cytokines
Gene Expression - genetics
Gene Expression - immunology
Leukocyte Common Antigens - genetics
Leukocyte Common Antigens - immunology
Mice
Mice, Transgenic
Protein Isoforms - genetics
Protein Isoforms - immunology
Time Factors
transgenic models
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Summary:Programmed cell death (apoptosis) is a key mechanism for regulating lymphocyte numbers. Murine lymph node lymphocytes cultured in vitro without added stimuli show significant levels of apoptosis over 24 h, detectable by staining with Annexin V. CD4 and CD8 T lymphocytes from transgenic (Tg) mice expressing single CD45RABC or CD45RO isoforms show increased apoptosis and the extent of apoptosis is inversely correlated with the level of CD45 expression. CD45 Tg cells exhibit phosphatidyl serine translocation and DNA oligonucleosome formation, and can be partially rescued from apoptosis by culture in caspase inhibitors or common γ-chain-binding cytokines. We conclude that CD45 is an important regulator of spontaneous apoptosis in T lymphocytes and this mechanism may contribute to the disease associations reported for individuals expressing CD45 variant alleles.
ISSN:0953-8178
1460-2377
DOI:10.1093/intimm/dxl032