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FK506 binding protein 12 mediates sensitivity to both FK506 and rapamycin in murine mast cells.

Abstract：

:The immunosuppressive drugs FK506 and rapamycin bind to a family of intracellular proteins termed FK506-binding proteins (FKBP). FK506 and rapamycin inhibit lymphocyte-activation pathways by forming complexes with an FKBP; subsequently, the drug/FKBP complexes interact with target molecules involved in signal transduction. A key target of FK506/FKBP12 complexes is calcineurin, a calcium- and calmodulin-dependent serine/threonine phosphatase. In mammalian cells, rapamycin treatment is associated with inhibition of the activity of several cellular serine/threonine kinases, including p70 S6 kinase. These kinases may function in signaling pathways involving TOR gene producs, which have been shown to interact with rapamycin/FKBP12 complexes in vitro. To determine if FKBP12 mediates the effects of both FK506 and rapamycin in mammalian cells, we overexpressed FKBP12 in a murine mast cell line. Increased expression of FKBP12 resulted in increased sensitivity to FK506 and rapamycin, as measured by inhibition of calcineurin activity and p70 S6 kinase activity, respectively. In contrast, overexpression of FKBP25 had no effect on sensitivity to either drug. Two distinct point mutations in FKBP12, one altering a hydrophobic residue within the drug-binding pocket and the other changing a charged surface residue of FKBP12, abrogated its ability to mediate sensitivity to FK506 and rapamycin. These results establish that FKBP12 can mediate sensitivity to both FK506 and rapamycin in mammalian cells.

journal_name

Eur J Immunol

journal_title

European journal of immunology

authors

Fruman DA,Wood MA,Gjertson CK,Katz HR,Burakoff SJ,Bierer BE

doi

10.1002/eji.1830250239

subject

Has Abstract

pub_date

1995-02-01 00:00:00

pages

563-71

issue

2

eissn

0014-2980

issn

1521-4141

journal_volume

25

pub_type

杂志文章

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