@article {Nakazawa:2002:1107-3756:269,
title = "TNF induces acetylation of p53 but attenuates its transcriptional activation in rheumatoid synoviocytes",
journal = "International Journal of Molecular Medicine",
parent_itemid = "infobike://sp/ijmm",
publishercode ="sp",
year = "2002",
volume = "10",
number = "3",
publication date ="2002-01-01T00:00:00",
pages = "269-275",
itemtype = "ARTICLE",
issn = "1107-3756",
eissn = "1791-244X",
url = "https://www.ingentaconnect.com/content/sp/ijmm/2002/00000010/00000003/art00006",
author = "Nakazawa and Aratani and Hatta and Araya and Daitoku and Kawahara and Watanabe and Nakamura and Yoshino and Fujii and Fujita and Fukamizu and Nishioka and Nakajima",
abstract = "Synovial hyperplasia is an important feature of rheumatoid arthritis (RA) and we have reported that several transcription factors were highly activated in rheumatoid synoviocytes. The purpose of this study was to examine nuclear acetylation in synoviocytes as an activation marker and
determine its role in cell activation. Autonomous acetylation of approximately 53 and 62 kDa nuclear proteins was detected in rheumatoid synoviocytes by anti-acetylated lysine specific antibody. Furthermore, tumor necrosis factor (TNF), a potent mitogen for synoviocytes, dose-dependently
increased their state of acetylation. Immunoprecipitation analysis revealed that 53 kDa acetylated protein (ap53) was identical with p53, a tumor suppressor gene product. Since enhanced p53 binding to the promoter by TNF treatment was detected by gel shift assay, we analyzed p53 promoter
activity by reporter assay system. Contrary to enhanced binding activity, the transcriptional activity was attenuated in a TNF concentration-dependent manner. Since p53 activation requires recruitment of CREB binding protein (CBP) as a coactivator, we also examined the effect of CBP
on TNF-induced attenuation of p53 promoter activation. Overexpression of CBP induced p53 transcriptional activity and recovery of TNF-induced inhibition. Our results clearly indicate that autonomous nuclear acetylation is characteristically enhanced in rheumatoid synoviocytes
and that p53 is one of acetylated protein. Our results also demonstrate that TNF-induced acetylation of p53 attenuated its transcriptional activation via CBP depletion, and that overexpression of CBP enhanced TNF-induced cell death in rheumatoid synoviocytes, suggesting that
regulation of transcriptional coactivator become a novel strategy for RA therapy.",
}