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Suppression of PROX1-mediated TERT expression in hepatitis B viral hepatocellular carcinoma

Authors
 Young‐Joo Kim  ;  Jeong Eun Yoo  ;  Youngsic Jeon  ;  Jae Uk Chong  ;  Gi Hong Choi  ;  Dae‐Geun Song  ;  Sang Hoon Jung  ;  Bong‐Kyeong Oh  ;  Young Nyun Park 
Citation
 International Journal of Cancer, Vol.143(12) : 3155-3168, 2018 
Journal Title
 International Journal of Cancer 
ISSN
 0020-7136 
Issue Date
2018
Keywords
B viral hepatocellular carcinoma ; HBx ; PROX1 ; TERT promoter mutation ; transcription factor
Abstract
Somatic mutations in the telomerase reverse transcriptase (TERT) promoter are related to telomerase activation and frequently occur at two hot spots located at -124 and -146 bp relative to the start codon in various cancers. Here, we investigated the occurrence and implications of genetic alterations in the TERT promoter in hepatitis B viral hepatocellular carcinoma (B viral HCC). TERT promoter mutations, especially -124C>T, clearly enhanced transcriptional activity in HCC cell lines. In contrast, TERT mRNA expression was lower in B viral HCC patients with TERT promoter mutations than in those without. We identified prospero homeobox protein 1 (PROX1) as a novel transcriptional activator of TERT; this protein was shown to have particularly strong binding affinity for the mutant TERT promoter. However, stable expression of the hepatitis B virus X (HBx) protein inhibited PROX1-mediated TERT expression in vitro. Our data suggest that TERT promoter mutations can enhance the promoter activity in HCC cell lines expressing PROX1 but are not the predominant mechanism of TERT upregulation in B viral HCC patients, based on the inhibition of PROX1-dependent transcriptional activation by HBx.
Full Text
https://onlinelibrary.wiley.com/doi/full/10.1002/ijc.31731
DOI
10.1002/ijc.31731
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Pathology (병리학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Surgery (외과학교실) > 1. Journal Papers
Yonsei Authors
박영년(Park, Young Nyun) ORCID logo https://orcid.org/0000-0003-0357-7967
유정은(Yoo, Jeong Eun) ORCID logo https://orcid.org/0000-0001-9990-279X
최기홍(Choi, Gi Hong) ORCID logo https://orcid.org/0000-0002-1593-3773
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/167142
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