Tumor Biology

, Volume 37, Issue 7, pp 9197–9207 | Cite as

Sprouty4 mediates amphiregulin-induced down-regulation of E-cadherin and cell invasion in human ovarian cancer cells

  • Wai-Kin So
  • Jung-Chien Cheng
  • Yingtao Liu
  • Congjian Xu
  • Jianfang Zhao
  • Vincent T. W. Chang
  • Peter C. K. Leung
Original Article

Abstract

Sprouty (SPRY) proteins are well-characterized factors that inhibit receptor tyrosine kinase (RTK)-mediated activation of cellular signaling pathways. The down-regulation of SPRY4 expression has been reported in human ovarian cancer. However, the specific roles and mechanisms by which SPRY4 affects ovarian cancer progression are completely unknown. Amphiregulin (AREG) binds exclusively to the epidermal growth factor receptor (EGFR) and has been considered to be a dominant autocrine/paracrine EGFR ligand in ovarian cancer. In the present study, we first examined the effects of AREG on SPRY4 expression and the possible underlying molecular mechanisms involved in this process in two human ovarian cancer cell lines. Our results demonstrated that treatment with AREG up-regulated SPRY4 expression by activating the ERK1/2 signaling pathway. In addition, we showed that small interfering RNA (siRNA)-mediated knockdown of SPRY4 attenuated the AREG-induced down-regulation of E-cadherin by inhibiting the expression of SNAIL but not SLUG. In contrast, overexpression of SPRY4 enhanced AREG-induced down-regulation of E-cadherin by increasing the expression of SNAIL. Moreover, SPRY4 knockdown attenuated AREG-induced cell migration and invasion. Overexpression of SPRY4 enhanced AREG-induced cell invasion. This study reveals that SPRY4 is involved in EGFR-mediated human ovarian cancer progression.

Keywords

Amphiregulin E-cadherin Ovarian cancer Sprouty4 

Notes

Acknowledgments

We also thank Dr. Graeme R. Guy (The Institute of Molecular and Cell Biology, Singapore) for the generous gifts of pXJ40-FLAG and FLAG-SPRY4 plasmids. This work was supported by an operating grant from the Canadian Institutes of Health Research (#143317) to P.C.K.L. P.C.K.L. is a Scientist Level 3 of the Child and Family Research Institute.

Compliance with ethical standards

Conflicts of interest

None.

Grant support

This work was supported by an operating grant from the Canadian Institutes of Health Research (#143317) to P.C.K.L.

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2016

Authors and Affiliations

  • Wai-Kin So
    • 1
  • Jung-Chien Cheng
    • 1
  • Yingtao Liu
    • 1
    • 2
  • Congjian Xu
    • 2
  • Jianfang Zhao
    • 1
  • Vincent T. W. Chang
    • 1
  • Peter C. K. Leung
    • 1
  1. 1.Department of Obstetrics and Gynaecology, Child & Family Research InstituteUniversity of British ColumbiaVancouverCanada
  2. 2.Obstetrics and Gynecology Hospital of Fudan UniversityShanghaiChina

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