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Nature. 1996 Jul 25;382(6589):370-3.

Role of kinases and the phosphatase calcineurin in the nuclear shuttling of transcription factor NF-AT4.

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Department of Cell Biology, Harvard Medical School, Boston, Massacusetts 02115, USA.


A new facet of calcium signalling involves the nuclear import of the NF-AT transcription factors from their dormant position in the cytoplasm. The protein phosphatase calcineurin appears to play an essential role in activating NF-AT nuclear import, as the calcineurin inhibitors cyclosporin A and FK506 block dephosphorylation and nuclear import of NF-AT (refs 4-7). Here we show that calcium signalling induces an association between NF-AT4 and calcineurin, and that these molecules are transported, as a complex, to the nucleus, where calcineurin continues to dephosphorylate NF-AT4. We propose that a nuclear complex of NF-AT4 and calcineurin maintains calcium signalling by counteracting a vigorous nuclear NF-AT kinase.

[Indexed for MEDLINE]

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