Journal article
Cyclophilin A-deficient mice are resistant to immunosuppression by cyclosporine
The Journal of immunology (1950), Vol.174(10), pp.6030-6038
05/15/2005
DOI: 10.4049/jimmunol.174.10.6030
PMID: 15879096
Abstract
Cyclosporine is an immunosuppressive drug that is widely used to prevent organ transplant rejection. Known intracellular ligands for cyclosporine include the cyclophilins, a large family of phylogenetically conserved proteins that potentially regulate protein folding in cells. Immunosuppression by cyclosporine is thought to result from the formation of a drug-cyclophilin complex that binds to and inhibits calcineurin, a serine/threonine phosphatase that is activated by TCR engagement. Amino acids within the cyclophilins that are critical for binding to cyclosporine have been identified. Most of these residues are highly conserved within the 15 mammalian cyclophilins, suggesting that many are potential targets for the drug. We examined the effects of cyclosporine on immune cells and mice lacking Ppia, the gene encoding the prototypical cyclophilin protein cyclophilin A. TCR-induced proliferation and signal transduction by Ppia(-/-) CD4(+) T cells were resistant to cyclosporine, an effect that was attributable to diminished calcineurin inhibition. Immunosuppressive doses of cyclosporine failed to block the responses of Ppia(-/-) mice to allogeneic challenge. Rag2(-/-) mice reconstituted with Ppia(-/-) splenocytes were also cyclosporine resistant, indicating that this property is intrinsic to Ppia(-/-) immune cells. Thus, among multiple potential ligands, CypA is the primary mediator of immunosuppression by cyclosporine.
Details
- Title: Subtitle
- Cyclophilin A-deficient mice are resistant to immunosuppression by cyclosporine
- Creators
- John Colgan - Department of Microbiology, Columbia University College of Physicians and Surgeons, New York, NY 10032, USAMohammed AsmalBin YuJeremy Luban
- Resource Type
- Journal article
- Publication Details
- The Journal of immunology (1950), Vol.174(10), pp.6030-6038
- DOI
- 10.4049/jimmunol.174.10.6030
- PMID
- 15879096
- NLM abbreviation
- J Immunol
- ISSN
- 0022-1767
- eISSN
- 1550-6606
- Publisher
- United States
- Grant note
- R01 AI036199 / NIAID NIH HHS R01 AI 36199 / NIAID NIH HHS
- Language
- English
- Date published
- 05/15/2005
- Academic Unit
- Anatomy and Cell Biology; Immunology; Internal Medicine
- Record Identifier
- 9984025687202771
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