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EGF‐Induced Connexin43 Negatively Regulates Cell Proliferation in Human Ovarian Cancer
Author(s) -
Qiu Xin,
Cheng JungChien,
Klausen Christian,
Chang HsunMing,
Fan Qianlan,
Leung Peter C. K.
Publication year - 2016
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.25058
Subject(s) - cell growth , downregulation and upregulation , epidermal growth factor , gene knockdown , ovarian cancer , cancer research , biology , microbiology and biotechnology , cancer cell , cell , cell culture , protein kinase b , cancer , signal transduction , biochemistry , genetics , gene
Connexin43 (Cx43) has been shown to regulate cell proliferation and its downregulation is correlated with poor prognosis and survival in several types of human cancer. Cx43 expression levels are frequently downregulated in human ovarian cancer, suggesting a potential role for Cx43 in regulating the progression of this disease. Epidermal growth factor (EGF) is a well‐characterized hormone that stimulates ovarian cancer cell proliferation. Although EGF is able to regulate Cx43 expression in other cell types, it is unclear whether EGF can regulate Cx43 expression in ovarian cancer cells. Additionally, it remains unknown whether Cx43 is involved in EGF‐stimulated ovarian cancer cell proliferation. In the present study, we demonstrate that treatment with EGF upregulates Cx43 expression in two ovarian cancer cell lines, SKOV3 and OVCAR4. Although treatment with EGF activates both ERK1/2 and Akt signaling pathways, pharmacological inhibition and siRNA‐mediated knockdown suggest that only the activation of Akt1 is required for EGF‐induced Cx43 upregulation. Functionally, Cx43 knockdown enhanced basal and EGF‐induced cell proliferation, whereas the proliferative effects of EGF were reduced by Cx43 overexpression. Co‐treatment with the gap junction inhibitor carbenoxolone did not alter the suppressive effects of Cx43 overexpression on EGF‐induced cell proliferation, suggesting a gap junction‐independent mechanism. This study reveals an important role for Cx43 as a negative regulator of EGF‐induced human ovarian cancer cell proliferation. J. Cell. Physiol. 230: 111–119, 2016. © 2015 Wiley Periodicals, Inc.