Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Epigenetic regulation of miR-21 in colorectal cancer: ITGB4 as a novel miR-21 target and a three-gene network (miR-21-ITGB44-PCDC4) as predictor of metastatic tumor potential
Δημιουργός/Συγγραφέας:	Ferraro A. Kontos C.K. Boni T. Bantounas I. Siakouli D. [EL] Κοσμίδου, Παρασκευή[EN] Kosmidou, Paraskevi Vlassi M. Spyridakis Y. Tsipras I. Zografos G. [EL] Πίντζας, Αλέξανδρος[EN] Pintzas, Alexander
Εκδότης:	Taylor and Francis Inc.
Ημερομηνία:	2014
Γλώσσα:	Αγγλικά
ISSN:	1559-2294
DOI:	10.4161/epi.26842
Άλλο:	PubMed ID: 24149370
Περίληψη:	Previous studies have uncovered several transcription factors that determine biological alterations in tumor cells to execute the invasion-metastasis cascade, including the epithelial-mesenchymal transition (EMT). We sought to investigate the role of miR-21 in colorectal cancer regulation. For this purpose, miR-21 expression was quantified in a panel of colorectal cancer cell lines and clinical specimens. High expression was found in cell lines with EMT properties and in the vast majority of human tumor specimens. We demonstrate in a cell-specific manner the occupancy of MIR-21 gene promoter by AP-1 and ETS1 transcription factors and, for the first time, the pattern of histone posttranslational modifications necessary for miR-21 overexpression. We also show that Integrin-β4 (ITGβ4), exclusively expressed in polarized epithelial cells, is a novel miR-21 target gene and plays a role in the regulation of EMT, since it is remarkably de-repressed after transient miR-21 silencing and downregulated after miR-21 overexpression. miR-21-dependent change of ITGβ4 expression significantly affects cell migration properties of colon cancer cells. Finally, in a subgroup of tumor specimens, ROC curve analysis performed on quantitative PCR data sets for miR-21, ITGβ4, and PDCD4 shows that the combination of high miR-21 with low ITGβ4 and PDCD4 expression is able to predict presence of metastasis. In conclusion, miR-21 is a key player in oncogenic EMT, its overexpression is controlled by the cooperation of genetic and epigenetic alterations, and its levels, along with ITGβ4 and PDCD4 expression, could be exploited as a prognostic tool for CRC metastasis.
Τίτλος πηγής δημοσίευσης:	Epigenetics
Τόμος/Κεφάλαιο:	9
Τεύχος:	1
Σελίδες:	129-141
Θεματική Κατηγορία:	[EL] Βιολογία (Γενικά)[EN] Biology (General)
Λέξεις-Κλειδιά:	Epithelial-mesenchymal transition (EMT) Histone modifications ITGβ4 Metastasis markers miR-21 RAS
Αξιολόγηση από ομότιμους (peer reviewed):	Ναι
Κάτοχος πνευματικών δικαιωμάτων:	© 2014 Landes Bioscience.
Όροι και προϋποθέσεις δικαιωμάτων:	All Open Access, Bronze, Green
Σημειώσεις:	EU FP7 Project 241783 EpiDiaCan; General Secretariat for Research and Technology, GSRT
Εμφανίζεται στις συλλογές:	Ινστιτούτο Χημικής Βιολογίας - Επιστημονικό έργο