%0 Journal Article %A Kim, Hyeyoung %A Lim, Joo Weon %A Seo, Jeong Yeon %A Kim, Kyung Hwan %D 2002 %I Begell House %N 2 %P 9 %R 10.1615/JEnvironPatholToxicolOncol.v21.i2.50 %T Oxidant-Sensitive Transcription Factor and Cyclooxygenase-2 by Helicobacter pylori Stimulation in Human Gastric Cancer Cells %U https://www.dl.begellhouse.com/journals/0ff459a57a4c08d0,4ac6c8531cba5202,419b49a4498fdc48.html %V 21 %X Helicobacter pylori (H. pylori) infection might activate nuclear factor-kB (NF-kB), an oxidant-sensitive transcription regulator of inducible expression of inflammatory genes such as cyclooxygenase-2 (COX-2). We studied the role of NF-kB on expression of COX-2 in H. pylori-stimulated gastric cancer cell lines by using antioxidants, glutathione (GSH), and N-acetylcysteine (NAC) as well as an NF-kB inhibitor, pyrrolidine dithiocarbamate (PDTC). Gastric adenocarcinoma cell lines derived from Caucasian (AGS) cells and Korean (SNU-484) cells were used to study the role of NF-kB on COX-2 expression by H. pylori. They were treated with GSH, NAC, or PDTC in the presence of H. pylori. mRNA expression and protein level for COX-2 were determined by Northern blot and RT-PCR analysis as well as Western blot analysis. NF-kB activation was examined by electrophoretic mobility shift assay. As a result, H. pylori induced a time-dependent expression of mRNA and protein for COX-2 via activation of NF-kB, which was inhibited by GSH, NAC, and PDTC in the cells. In conclusion, oxidant-sensitive transcription factor NF-kB may play a novel role in expression of COX-2 by H. pylori stimulation in gastric cancer cells. %8 2002-06-01