Characterization of glycine-N-methyltransferase-gene expression in human hepatocellular carcinoma.

Abstract:

:Messenger RNA differential display was used to study liver-gene expression in paired tumor and non-tumor tissues from hepatocellular carcinoma (HCC) patients. mRNA differential display and Northern-blot analyses showed that a 0.8-kb cDNA fragment was diminished or absent from the tumorous tissues of 7 HCC patients. The cDNA fragment was sequenced and found to have 98.7% nucleotide sequence homology with human glycine-N-methyltransferase cDNA (GNMT). In addition, there was no detectable level of GNMT expression in 4 human HCC cell lines, SK-Hep1, Hep 3B, HuH-7 and HA22T, examined by Northern-blot assay. A full-length GNMT cDNA clone-9-1-2 was obtained by screening a Taiwanese liver cDNA library. In comparison with the GNMT cDNA sequence reported elsewhere, clone 9-1-2 had 4 nucleotide differences resulting in 1 amino-acid change. Immunohistochemical staining with rabbit anti-recombinant GNMT serum showed that GNMT protein almost completely disappeared in liver-cancer cells, while it was abundant in the non-tumorous liver cells. Down-regulation of GNMT gene expression may be involved in the pathogenesis of liver cancer.

journal_name

Int J Cancer

authors

Chen YM,Shiu JY,Tzeng SJ,Shih LS,Chen YJ,Lui WY,Chen PH

doi

10.1002/(sici)1097-0215(19980302)75:5<787::aid-ijc

subject

Has Abstract

pub_date

1998-03-02 00:00:00

pages

787-93

issue

5

eissn

0020-7136

issn

1097-0215

pii

10.1002/(SICI)1097-0215(19980302)75:5<787::AID-IJC

journal_volume

75

pub_type

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