Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Differential tert promoter methylation and response to 5-aza-20-deoxycytidine in Acute Myeloid Leukemia cell lines: tert expression, telomerase activity, telomere length, and cell death

Pettigrew, Kerry A., Armstrong, Richard N., Colyer, Hilary A. A., Zhang, Shu-Dong, Rea, Irene Maeve, Robinson, Rhiannon Elizabeth, Baird, Duncan Martin and Mills, Ken I. 2012. Differential tert promoter methylation and response to 5-aza-20-deoxycytidine in Acute Myeloid Leukemia cell lines: tert expression, telomerase activity, telomere length, and cell death. Genes, Chromosomes and Cancer 51 (8) , pp. 768-780. 10.1002/gcc.21962

Full text not available from this repository.

Abstract

The catalytic subunit of human telomerase (TERT) is highly expressed in cancer cells, and correlates with complex cytogenetics and disease severity in acute myeloid leukemia (AML). The TERT promoter is situated within a large CpG island, suggesting that expression is methylation-sensitive. Studies suggest a correlation between hypermethylation and TERT overexpression. We investigated the relationship between TERT promoter methylation and expression and telomerase activity in human leukemia and lymphoma cell lines. DAC-induced demethylation and cell death were observed in all three cell lines, as well as telomere shortening in HL-60 cells. DAC treatment reduced TERT expression and telomerase activity in OCI/AML3 and HL-60 cells, but not in U937 cells. Control U937 cells expressed lower levels of TERT mRNA, carried a highly methylated TERT core promoter, and proved more resistant to DAC-induced repression of TERT expression and cell death. AML patients had significantly lower methylation levels at several CpGs than ‘‘well elderly’’ individuals. This study, the first to investigate the relationship between TERT methylation and telomerase activity in leukemia cells, demonstrated a differential methylation pattern and response to DAC in three AML cell lines. We suggest that, although DAC treatment reduces TERT expression and telomerase activity, this is unlikely to occur via direct demethylation of the TERT promoter. However, further investigations on the regions spanning CpGs 7–12 and 14–16 may reveal valuable information regarding transcriptional regulation of TERT.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: R Medicine > RC Internal medicine > RC0254 Neoplasms. Tumors. Oncology (including Cancer)
Publisher: Wiley-Liss Inc
ISSN: 1045-2257
Last Modified: 04 Jun 2017 04:36
URI: http://orca.cf.ac.uk/id/eprint/41484

Citation Data

Cited 19 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item