Epidermal growth factor upregulates endometrial CYR61 expression via activation of the JAK2/STAT3 pathway
Rebecca Klein A B , Simone Stiller A and Isabella Gashaw A C D
+ Author Affiliations
- Author Affiliations
A University of Duisburg-Essen, Institute of Anatomy II, Hufelandstraße 55, 45122 Essen, Germany.
B Present address: University of Duisburg-Essen, Institute of Molecular Biology, Hufelandstraße 55, 45122 Essen, Germany.
C Present address: Bayer HealthCare, Global Drug Discovery, Muellerstr. 178, 13342 Berlin, Germany.
D Corresponding author. Email: isabella.gashaw@bayer.com
Reproduction, Fertility and Development 24(3) 482-489 https://doi.org/10.1071/RD10335
Abstract
Endometrial cysteine-rich protein 61 (CYR61, CCN1) is a growth factor-inducible gene whose expression is elevated during the proliferative phase of the menstrual cycle and which has been implicated in the pathogenesis of endometriosis. This study aimed to define the mediators of epidermal growth factor (EGF) signalling on CYR61 expression in spontaneously immortalised human endometrial epithelial cells (HES) as a model system. After 30 min of EGF treatment, the receptor was phosphorylated and internalised as well as mRNA CYR61 increased in HES cells. However, neither inhibition of C-terminal EGF receptor (EGFR)-phosphorylation nor blockage of the mitogen-activated proteinkinase/extracellular signal-regulated kinase (MAPK/ERK) pathway was able to reduce CYR61 levels. Surprisingly, the HES cells showed upregulation of CYR61 mRNA expression after inhibition of the MAPK/ERK pathway when treated with EGF. Specific inhibitor studies identified the contribution of Janus kinase 2 (JAK2) and the signal transducer and activator of transcription protein STAT3 to the regulation of CYR61 expression. The JAK2/STAT3 interaction contributed to the basal expression of CYR61 and mediated EGF-driven regulation of CYR61 after 30 and 120 min of treatment. In summary, EGF-mediated CYR61 upregulation in HES cells involves STAT3 and is counter-regulated by the EGFR/MAPK/ERK pathway.
Additional keywords: endometrium, signal transducers and activators of transcription proteins.
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