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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Molkentin, Jeffery D. Rothenberg, Marc E. Brandt, Eric B. Bueno, Orlando F. |
| Description | Author Affiliation: Bueno OF ( Division of Molecular Cardiovascular Biology, Department of Pediatrics, Children's Hospital Medical Center, 3333 Burnet Avenue, Cincinnati, OH 45229-3039, USA.); |
| Abstract | The calcium-dependent phosphatase calcineurin and its downstream transcriptional effector nuclear factor of activated T cells (NFAT) are important regulators of inducible gene expression in multiple cell types. In T cells, calcineurin-NFAT signaling represents a critical event for mediating cellular activation and the immune response. The widely used immunosuppressant agents cyclosporin and FK506 are thought to antagonize the immune response by directly inhibiting calcineurin-NFAT signal transduction in lymphocytes. To unequivocally establish the importance of calcineurin signaling as a mediator of the immune response, we deleted the gene encoding the predominant calcineurin isoform expressed in lymphocytes, calcineurin A beta (CnA beta). CnA beta(-/-) mice were viable as adults, but displayed defective T cell development characterized by fewer total CD3 cells and reduced CD4 and CD8 single positive cells. Total peripheral T cell numbers were significantly reduced in CnA beta(-/-) mice and were defective in proliferative capacity and IL-2 production in response to PMA/ionomycin and T cell receptor cross-linking. CnA beta(-/-) mice also were permissive to allogeneic tumor-cell transplantation in vivo, similar to cyclosporin-treated wild-type mice. A mechanism for the compromised immune response is suggested by the observation that CnA beta(-/-) T cells are defective in stimulation-induced NFATc1, NFATc2, and NFATc3 activation. These results establish a critical role for CnA beta signaling in regulating T cell development and activation in vivo. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 14 |
| Volume Number | 99 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2002-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Calcineurin Deficiency Nuclear Proteins T-Lymphocytes Immunology Animals Genetics Physiology Cytotoxicity, Immunologic DNA-Binding Proteins Metabolism In Vitro Techniques Interleukin-2 Biosynthesis Ionomycin Pharmacology Lymphocyte Activation Mice Mice, Inbred C57BL Mice, Knockout NFATC Transcription Factors Plasmacytoma Receptors, Antigen, T-Cell Signal Transduction Drug Effects Tetradecanoylphorbol Acetate Transcription Factors Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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