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Mol Cell. 2005 Nov 23;20(4):539-50.

Akt blocks breast cancer cell motility and invasion through the transcription factor NFAT.

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  • 1Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA.

Erratum in

  • Mol Cell. 2006 Apr 7;22(1):145.

Abstract

The phosphoinositide 3-kinase (PI 3-K) signaling axis is intimately associated with deregulated cancer cell growth, primarily by promoting increased survival through Akt/PKB (protein kinase B). However, there is relatively little information on the role of Akt in cancer cell motility, a key phenotype of invasive carcinomas. Here we report that activation of Akt inhibits carcinoma migration and invasion of breast cancer cells. Conversely, downregulation of Akt using RNA interference increased migration and invasion. Akt blunts invasion by inhibiting the transcriptional activity of NFAT (nuclear factor of activated T cells). Specifically, signaling through Akt reduces NFAT expression levels due to ubiquitination and proteasomal degradation, mediated by the E3 ubiquitin ligase HDM2. These results indicate that while Akt can promote tumor progression through increased cell survival mechanisms, it can block breast cancer cell motility and invasion by a mechanism that depends, at least in part, on the NFAT transcription factor.

PMID:
16307918
[PubMed - indexed for MEDLINE]
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