Twist1 and AP-1 cooperatively upregulate integrin α5 expression to induce invasion and the epithelial-mesenchymal transition.

Abstract:

:Epithelial-mesenchymal transition (EMT) is an important process implicated in tumor invasion and metastasis. Twist1 is a transcription factor that induces EMT, including E-cadherin suppression and cancer cell migration and invasion; hence it promotes cancer metastasis. Twist1 directly or indirectly regulates the expression of various genes and cellular functions involved in cancer progression. However, the underlying mechanisms remain largely unknown. In this study, we investigated the molecular basis for Twist1-mediated invasion and EMT. In human cancer cells, Twist1 was found to directly upregulate transcription of the mesenchymal gene integrin α5 in an E-box-independent, but activating protein-1 (AP-1) element-dependent, manner. Twist1 activated the integrin α5 promoter by interacting with and activating the transcription factor AP-1, composed of c-Jun and activating transcription factor-2 (ATF-2); it also enhanced the nuclear presence of ATF-2. AP-1 was critical for Twist1-induced cancer cell invasion, primarily through the induction of integrin α5, which activated c-Jun N-terminal kinase and focal adhesion kinase-signaling activities. Using data from The Cancer Genome Atlas, we found that Twist1 expression positively correlates with integrin α5 expression in human colorectal cancers. These findings suggest that cooperation between Twist1 and AP-1 represents a novel mechanism for EMT and tumor invasiveness. This study supports further investigation into the molecular basis underlying the diverse Twist1-mediated functions that occur during tumor progression.

journal_name

Carcinogenesis

journal_title

Carcinogenesis

authors

Nam EH,Lee Y,Moon B,Lee JW,Kim S

doi

10.1093/carcin/bgv005

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

327-37

issue

3

eissn

0143-3334

issn

1460-2180

pii

bgv005

journal_volume

36

pub_type

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