FBXW7 modulates cellular stress response and metastatic potential through ?HSF1 post-translational modification.

ABSTRACT: ?Heat-shock factor 1 (?HSF1) orchestrates the heat-shock response in eukaryotes. Although this pathway has evolved to help cells adapt in the presence of challenging conditions, it is co-opted in cancer to support malignancy. However, the mechanisms that regulate ?HSF1 and thus cellular stress response are poorly understood. Here we show that the ubiquitin ligase ?FBXW7? interacts with ?HSF1 through a conserved motif phosphorylated by ?GSK3? and ?ERK1. ?FBXW7? ubiquitylates ?HSF1 and loss of ?FBXW7? results in impaired degradation of nuclear ?HSF1 and defective heat-shock response attenuation. ?FBXW7? is either mutated or transcriptionally downregulated in melanoma and ?HSF1 nuclear stabilization correlates with increased metastatic potential and disease progression. ?FBXW7? deficiency and subsequent ?HSF1 accumulation activates an invasion-supportive transcriptional program and enhances the metastatic potential of human melanoma cells. These findings identify a post-translational mechanism of regulation of the ?HSF1 transcriptional program both in the presence of exogenous stress and in cancer.

SUBMITTER: Kourtis N 

PROVIDER: S-EPMC4401662 | biostudies-literature | 2015 Mar

REPOSITORIES: biostudies-literature