Oestrogen causes degradation of KLF5 by inducing the E3 ubiquitin ligase EFP in ER-positive breast cancer cells.

ABSTRACT: KLF5 (Krüppel-like factor 5) is a multifunctional transcription factor involved in cell proliferation, differentiation and carcinogenesis. In addition to frequent inactivation in different types of human cancers, including breast cancer, KLF5 has been identified as an essential co-factor for the TGF-β (transforming growth factor β) tumour suppressor. In our previous study demonstrating a negative regulation of ER (oestrogen receptor α) function by KLF5 in breast cancer cells [Guo, Dong, Zhao, Sun, Li and Dong (2010) Int. J. Cancer 126, 81-89], we noticed that oestrogen reduced the protein level of KLF5. In the present study, we have tested whether and how oestrogen/ER signalling regulates KLF5 protein. We found that oestrogen caused the degradation of KLF5 protein, and the degradation was

SUBMITTER: Zhao KW 

PROVIDER: S-EPMC3733548 | biostudies-literature | 2011 Jul

REPOSITORIES: biostudies-literature