CCAAT/enhancer binding protein delta (C/EBPδ) demonstrates a dichotomous role in tumour initiation and promotion of epithelial carcinoma.

Autor:	Sowamber R; Campbell Family Institute for Breast Cancer Research, Toronto, Ontario, Canada; Princess Margaret Cancer Center, University Health Network, Toronto, Ontario, Canada., Chehade R; Campbell Family Institute for Breast Cancer Research, Toronto, Ontario, Canada; Princess Margaret Cancer Center, University Health Network, Toronto, Ontario, Canada., Bitar M; Campbell Family Institute for Breast Cancer Research, Toronto, Ontario, Canada; Princess Margaret Cancer Center, University Health Network, Toronto, Ontario, Canada., Dodds LV; Sylvester Comprehensive Cancer Center, Miami, Florida, United States; University of Miami, Leonard Miller School of Medicine, Miami, Florida, United States., Milea A; Campbell Family Institute for Breast Cancer Research, Toronto, Ontario, Canada; Princess Margaret Cancer Center, University Health Network, Toronto, Ontario, Canada., Slomovitz B; Sylvester Comprehensive Cancer Center, Miami, Florida, United States; Department of Obstetrics and Gynecology and Reproductive Sciences, Division of Gynecology Oncology, Miami, Florida, United States; University of Miami, Leonard Miller School of Medicine, Miami, Florida, United States., Shaw PA; Campbell Family Institute for Breast Cancer Research, Toronto, Ontario, Canada; Princess Margaret Cancer Center, University Health Network, Toronto, Ontario, Canada; Department of Laboratory Medicine and Pathobiology, Toronto, Ontario, Canada; University of Toronto, Toronto, Ontario, Canada., George SHL; Sylvester Comprehensive Cancer Center, Miami, Florida, United States; Department of Obstetrics and Gynecology and Reproductive Sciences, Division of Gynecology Oncology, Miami, Florida, United States; University of Miami, Leonard Miller School of Medicine, Miami, Florida, United States. Electronic address: sophia.george@med.miami.edu.
Jazyk:	angličtina
Zdroj:	EBioMedicine [EBioMedicine] 2019 Jun; Vol. 44, pp. 261-274. Date of Electronic Publication: 2019 May 09.
DOI:	10.1016/j.ebiom.2019.05.002
Abstrakt:	Background: CCAAT/enhancer binding protein delta (C/EBPδ,CEBPD), a gene part of the highly conserved basic-leucine zipper (b-ZIP) domain of transcriptional factors, is downregulated in 65% of high grade serous carcinomas of the ovary (HGSC). Overexpression of C/EBPδ in different tumours, such as glioblastoma and breast cancer either promotes tumour progression or inhibits growth and has low expression in normal tissue until activated by cytotoxic stressors. Methods: Higher overall expression of C/EBPδ in the luteal phase of the menstrual cycle prompted us to investigate the role of C/EBPδ in carcinogenesis. In vitro experiments were conducted in fallopian tube cell samples and cancer cell lines to investigate the role of C/EBPδ in proliferation, migration, and the epithelial to mesenchymal transition. Findings: Expression of C/EBPδ induced premature cellular arrest and decreased soft agar colony formation. Loss of C/EBPδ in epithelial cancer cell lines did not have significant effects on proliferation, yet overexpression demonstrated downregulation of growth, similar to normal fallopian tube cells. C/EBPδ promoted a partial mesenchymal to epithelial (MET) phenotype by upregulating E-cadherin and downregulating Vimentin and N-cadherin in FTE cells and increased migratory activity, which suggests a regulatory role in the epithelial-mesenchymal plasticity of these cells. Interpretation: Our findings suggest that C/EBPδ regulates the phenotype of normal fallopian tube cells by acting on downstream regulatory factors that are implicated in the development of ovarian serous carcinogenesis. FUND: This study was funded by the CDMRP Ovarian Cancer program (W81WH-0701-0371, W81XWH-18-1-0072), the Princess Margaret Cancer Centre Foundation, Foundation for Women's Cancer - The Belinda-Sue/Mary-Jane Walker Fund, Colleen's Dream Foundation and Sylvester Comprehensive Cancer Center. (Copyright © 2019 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze:	MEDLINE
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