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2017 ; 7
(ä): 43078
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Direct binding of MEK1 and MEK2 to AKT induces Foxo1 phosphorylation, cellular
migration and metastasis
#MMPMID28225038
Procaccia S
; Ordan M
; Cohen I
; Bendetz-Nezer S
; Seger R
Sci Rep
2017[Feb]; 7
(ä): 43078
PMID28225038
show ga
Crosstalk between the ERK cascade and other signaling pathways is one of the
means by which it acquires its signaling specificity. Here we identified a direct
interaction of both MEK1 and MEK2 with AKT. The interaction is mediated by the
proline rich domain of MEK1/2 and regulated by phosphorylation of Ser298 in MEK1,
or Ser306 in MEK2, which we identified here as a novel regulatory site. We
further developed a blocking peptide, which inhibits the interaction between MEK
and AKT, and when applied to cells, affects migration and adhesion, but not
proliferation. The specific mechanism of action of the MEK-AKT complex involves
phosphorylation of the migration-related transcription factor FoxO1. Importantly,
prevention of the interaction results in a decreased metastasis formation in a
breast cancer mouse model. Thus, the identified interaction both sheds light on
how signaling specificity is determined, and represents a possible new
therapeutic target for metastatic cancer.