Activin B induces human endometrial cancer cell adhesion, migration and invasion by up-regulating integrin ?3 via SMAD2/3 signaling.

ABSTRACT: Endometrial cancer is the fourth most common female cancer and the most common gynecological malignancy. Although it comprises only ~10% of all endometrial cancers, the serous histological subtype accounts for ~40% of deaths due to its aggressive behavior and propensity to metastasize. Histopathological studies suggest that elevated expression of activin/inhibin ?B subunit is associated with reduced survival in non-endometrioid endometrial cancers (type II, mostly serous). However, little is known about the specific roles and mechanisms of activin B (?B dimer) in serous endometrial cancer growth and progression. In the present study, we examined the biological functions of activin B in type II endometrial cancer cell lines, HEC-1B and KLE. Our results demonstrate that treatment with activin B increases cell migration, invasion and adhesion to vitronectin, but does not affect cell viability. Moreover, we show that activin B treatment increases integrin ?3 mRNA and protein levels via SMAD2/3-SMAD4 signaling. Importantly, siRNA knockdown studies revealed that integrin ?3 is required for basal and activin B-induced cell migration, invasion and adhesion. Our results suggest that activin B-SMAD2/3-integrin ?3 signaling could contribute to poor patient survival by promoting the invasion and/or metastasis of type II endometrial cancers.

SUBMITTER: Xiong S 

PROVIDER: S-EPMC4741631 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature