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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Falahati, Rustom Leitenberg, David |
| Description | Country affiliation: United States Author Affiliation: Falahati R ( Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, DC 20037, USA.) |
| Abstract | In CD45-deficient animals, there is a severe defect in thymocyte-positive selection, resulting in an absence of mature T cells and the accumulation of thymocytes at the DP stage of development. However, the signaling defect(s) responsible for the block in development of mature single-positive T cells is not well characterized. Previous studies have found that early signal transduction events in CD45-deficient cell lines and thymocytes are markedly diminished following stimulation with anti-CD3. Nevertheless, there are also situations in which T cell activation and TCR signaling events can be induced in the absence of CD45. For example, CD45-independent TCR signaling can be recovered upon simultaneous Ab cross-linking of CD3 and CD4 compared with cross-linking of CD3 alone. These data suggest that CD45 may differentially regulate TCR signaling events depending on the nature of the signal and/or on the differentiation state of the cell. In the current study, we have assessed the role of CD45 in regulating primary thymocyte activation following physiologic stimulation with peptide. Unlike CD3-mediated stimulation, peptide stimulation of CD45-deficient thymocytes induces diminished, but readily detectable TCR-mediated signaling events, such as phosphorylation of TCR-associated zeta, ZAP70, linker for activation of T cells, and Akt, and increased intracellular calcium concentration. In contrast, phosphorylation of ERK, which is essential for positive selection, is more severely affected in the absence of CD45. These data suggest that CD45 has a selective role in regulating different aspects of T cell activation. |
| ISSN | 00221767 |
| e-ISSN | 15506606 |
| Journal | The Journal of Immunology |
| Issue Number | 9 |
| Volume Number | 181 |
| Language | English |
| Publisher | The American Association of Immunologists |
| Publisher Date | 2008-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Antigens, Cd45 Physiology Cell Differentiation Immunology Protein Tyrosine Phosphatases Receptors, Antigen, T-cell Signal Transduction Thymus Gland Enzymology Amino Acid Sequence Animals Deficiency Genetics Mice Mice, Inbred C57bl Mice, Knockout Mice, Transgenic Molecular Sequence Data T-lymphocytes Cytology Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't Discipline Immunology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Immunology and Allergy Immunology |
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