Human pancreatic carcinoma cells activate maspin expression through loss of epigenetic control.

Abstract:

:The maspin gene is not expressed in normal human pancreas, but its expression is acquired during human pancreatic carcinogenesis. In other normal human cells and their malignant counterparts, maspin expression is controlled through the epigenetic state of its promoter. In studies presented herein, we used bisulfite genomic sequencing and chromatin immunoprecipitation studies to show that maspin-negative pancreas cells have a methylated maspin promoter, and that the associated H3 and H4 histones are hypoacetylated. In contrast to normal pancreas, four of six human pancreatic carcinoma cell lines investigated displayed activation of maspin expression. This activation of maspin expression in pancreatic carcinoma cells was linked to demethylated promoters and hyperacetylation of the associated H3 and H4 histones. In addition, 5-aza-2'-deoxycytidine treatments activated maspin expression in the two maspin-negative pancreatic carcinoma cell lines, suggesting a causal role for cytosine methylation in the maintenance of a transcriptionally silent maspin gene. Thus, human pancreatic carcinoma cells acquire maspin expression through epigenetic derepression of the maspin locus, and in so doing appear to co-opt a normal cellular mechanism for the regulation of this gene.

journal_name

Neoplasia

authors

Fitzgerald M,Oshiro M,Holtan N,Krager K,Cullen JJ,Futscher BW,Domann FE

doi

10.1016/s1476-5586(03)80045-3

keywords:

subject

Has Abstract

pub_date

2003-09-01 00:00:00

pages

427-36

issue

5

eissn

1522-8002

issn

1476-5586

journal_volume

5

pub_type

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