Abstract:
:Golgi phosphoprotein 2 (GP73) is a type II Golgi protein, which was found on examination of the fucosylated proteome as a potential tumor marker for hepatocellular carcinoma (HCC). The serum levels of both total and fucosylated GP73 were increased in the sera of patients with HCC. Fucosylation is one of the most important oligosaccharide modifications involved in cancer and is catalyzed by α1,6-fucosyltransferase (Fut8). In the present study, we investigated the effect of Fut8 overexpression on GP73 production in the human hepatoma cell line Hep3B. The Fut8 expression vector was transfected into Hep3B cells and the expression of GP73 was investigated by Western blotting and real-time PCR. Overexpression of Fut8 dramatically enhanced the expression of GP73 at the transcriptional level. Surprisingly, this effect was not dependent on cellular fucosylation. Overexpression of a mutant Fut8, which was unable to be localized to the Golgi, did not induce GP73 production, suggesting that the localization of Fut8 in the Golgi apparatus was important for the increase in GP73 expression. This is the first demonstration of GP73 regulation through overexpression of a glycosyltransferase, which may lead to Golgi stress.
journal_name
Int J Oncoljournal_title
International journal of oncologyauthors
Kawamoto S,Moriwaki K,Nakagawa T,Terao M,Shinzaki S,Yamane-Ohnuki N,Satoh M,Mehta AS,Block TM,Miyoshi Edoi
10.3892/ijo.2011.1005subject
Has Abstractpub_date
2011-07-01 00:00:00pages
203-8issue
1eissn
1019-6439issn
1791-2423journal_volume
39pub_type
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