Abstract
Inhibition of the calcineurin-NFAT signalling pathway is one of the main challenges for immunosuppression therapy to avoid the severe side effects of the current anticalcineurinic drugs, cyclosporin A and FK506. The members of the calcipressin family are endogenous inhibitors of calcineurin. We describe for the first time that two independent motifs within human calcipressin 1, the ELHA and the PxIxxT motifs, interact with calcineurin in an independent functional manner. However, the main finding here is that the ELHA-containing calcineurin-inhibitor CALP1 (CIC) motif is the responsible for the in vivo inhibition of calcineurin-mediated NFAT-dependent cytokine gene expression in human T cells. We believe that the identification of the CIC motif could be used as a starting point for the development of new immunosuppressive drugs for use in transplantation and autoimmune diseases.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Motifs
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Amino Acid Sequence
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Calcineurin / genetics
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Calcineurin / metabolism*
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Cell Line
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Cytokines / genetics
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Cytokines / metabolism*
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DNA-Binding Proteins
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Gene Expression Regulation*
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Humans
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Intracellular Signaling Peptides and Proteins / genetics
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Intracellular Signaling Peptides and Proteins / metabolism*
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Jurkat Cells
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Molecular Sequence Data
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Muscle Proteins / genetics
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Muscle Proteins / metabolism*
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NFATC Transcription Factors / genetics
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NFATC Transcription Factors / metabolism*
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Recombinant Fusion Proteins / genetics
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Recombinant Fusion Proteins / metabolism
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Sequence Alignment
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Signal Transduction / physiology
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T-Lymphocytes / cytology
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T-Lymphocytes / physiology*
Substances
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Cytokines
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DNA-Binding Proteins
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Intracellular Signaling Peptides and Proteins
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Muscle Proteins
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NFATC Transcription Factors
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RCAN1 protein, human
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Recombinant Fusion Proteins
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Calcineurin