Abstract
Calcineurin plays a pivotal role in the T cell receptor (TCR)-mediated signal transduction pathway and serves as a common target for the immunosuppressants FK506 and cyclosporin A. We report the identification of a novel endogenous calcineurin binding protein named Cabin I that inhibits calcineurin-mediated signal transduction. The interaction between Cabin 1 and calcineurin is dependent on PKC activation. Overexpression of Cabin 1 or its N-terminal truncation mutants inhibits the transcriptional activation of calcineurin-responsive elements in the interleukin-2 promoter and blocks dephosphorylation of NF-AT upon T cell activation. These results suggest a negative regulatory role for Cabin 1 in calcineurin signaling and provide a possible mechanism of feedback inhibition of TCR signaling through cross- talk between protein kinases and calcineurin.
Original language | English (US) |
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Pages (from-to) | 703-711 |
Number of pages | 9 |
Journal | Immunity |
Volume | 8 |
Issue number | 6 |
DOIs | |
State | Published - Jun 1998 |
Externally published | Yes |
ASJC Scopus subject areas
- Immunology and Allergy
- Immunology
- Infectious Diseases