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Helicobacter pylori stimulates urokinase plasminogen activator receptor expression and cell invasiveness through reactive oxygen species and NF-kappaB signaling in human gastric carcinoma cells.
Int J Mol Med. 2007 Apr; 19(4):689-97.IJ

Abstract

The gastric pathogen, helicobacter pylori (H. pylori), has been associated with the progression of gastric cancer. It was previously reported that H. pylori induced urokinase plasminogen activator receptor (uPAR) expression and stimulated cell invasiveness in human gastric cancer AGS cells. However, the precise mechanisms for how H. pylori upregulates uPAR are unclear. This study investigated the underlying signal pathways in H. pylori-induced uPAR in human gastric cancer AGS cells. The intracellular H2O2 content, as determined using H2O2-sensitive probe 2',7'-dichlorodihydrofluorescein, increased after the H. pylori treatment. N-acetyl cysteine (NAC), an antioxidant, prevented the H. pylori-induced production of H2O2 and uPAR expression. In addition, exogenous H2O2 was found to increase uPAR mRNA expression and its promoter activity. Site-directed mutagenesis of the potential NF-kappaB element in the uPAR promoter showed that the redox-sensitive transcription factor NF-kappaB was essential for H. pylori-induced uPAR expression. The expression of vectors encoding a mutated-type NF-kappaB-inducing kinase and I-kappaB, and a specific inhibitor of NF-kappaB (BAY11-7082) decreased the H. pylori-induced uPAR promoter activity. Chromatin immunoprecipitation and the electrophoretic mobility shift assay confirmed that H. pylori increased the DNA binding activity of NF-kappaB. With the aid of NAC and H2O2, it was determined that reactive oxygen species (ROS) is an upstream signaling molecule for activating the NF-kappaB induced by H. pylori. The enhanced AGS cell invasiveness by H. pylori was partially abrogated by an NAC and BAY11-7082 treatment. These results suggest that the ROS and NF-kappaB signaling pathway is important in H. pylori-induced uPAR expression and the increased cell invasiveness of human gastric cancer AGS cells.

Authors+Show Affiliations

Chonnam University Research Institute of Medical Sciences, Chonnam National University Medical School, Kwangju 501-190, Korea.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17334646

Citation

Kim, Mi H., et al. "Helicobacter Pylori Stimulates Urokinase Plasminogen Activator Receptor Expression and Cell Invasiveness Through Reactive Oxygen Species and NF-kappaB Signaling in Human Gastric Carcinoma Cells." International Journal of Molecular Medicine, vol. 19, no. 4, 2007, pp. 689-97.
Kim MH, Yoo HS, Kim MY, et al. Helicobacter pylori stimulates urokinase plasminogen activator receptor expression and cell invasiveness through reactive oxygen species and NF-kappaB signaling in human gastric carcinoma cells. Int J Mol Med. 2007;19(4):689-97.
Kim, M. H., Yoo, H. S., Kim, M. Y., Jang, H. J., Baek, M. K., Kim, H. R., Kim, K. K., Shin, B. A., Ahn, B. W., & Jung, Y. D. (2007). Helicobacter pylori stimulates urokinase plasminogen activator receptor expression and cell invasiveness through reactive oxygen species and NF-kappaB signaling in human gastric carcinoma cells. International Journal of Molecular Medicine, 19(4), 689-97.
Kim MH, et al. Helicobacter Pylori Stimulates Urokinase Plasminogen Activator Receptor Expression and Cell Invasiveness Through Reactive Oxygen Species and NF-kappaB Signaling in Human Gastric Carcinoma Cells. Int J Mol Med. 2007;19(4):689-97. PubMed PMID: 17334646.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Helicobacter pylori stimulates urokinase plasminogen activator receptor expression and cell invasiveness through reactive oxygen species and NF-kappaB signaling in human gastric carcinoma cells. AU - Kim,Mi H, AU - Yoo,Hyung S, AU - Kim,Mi Y, AU - Jang,Hee J, AU - Baek,Min K, AU - Kim,Hyeong R, AU - Kim,Kyung K, AU - Shin,Boo A, AU - Ahn,Bong W, AU - Jung,Young D, PY - 2007/3/6/pubmed PY - 2007/5/3/medline PY - 2007/3/6/entrez SP - 689 EP - 97 JF - International journal of molecular medicine JO - Int J Mol Med VL - 19 IS - 4 N2 - The gastric pathogen, helicobacter pylori (H. pylori), has been associated with the progression of gastric cancer. It was previously reported that H. pylori induced urokinase plasminogen activator receptor (uPAR) expression and stimulated cell invasiveness in human gastric cancer AGS cells. However, the precise mechanisms for how H. pylori upregulates uPAR are unclear. This study investigated the underlying signal pathways in H. pylori-induced uPAR in human gastric cancer AGS cells. The intracellular H2O2 content, as determined using H2O2-sensitive probe 2',7'-dichlorodihydrofluorescein, increased after the H. pylori treatment. N-acetyl cysteine (NAC), an antioxidant, prevented the H. pylori-induced production of H2O2 and uPAR expression. In addition, exogenous H2O2 was found to increase uPAR mRNA expression and its promoter activity. Site-directed mutagenesis of the potential NF-kappaB element in the uPAR promoter showed that the redox-sensitive transcription factor NF-kappaB was essential for H. pylori-induced uPAR expression. The expression of vectors encoding a mutated-type NF-kappaB-inducing kinase and I-kappaB, and a specific inhibitor of NF-kappaB (BAY11-7082) decreased the H. pylori-induced uPAR promoter activity. Chromatin immunoprecipitation and the electrophoretic mobility shift assay confirmed that H. pylori increased the DNA binding activity of NF-kappaB. With the aid of NAC and H2O2, it was determined that reactive oxygen species (ROS) is an upstream signaling molecule for activating the NF-kappaB induced by H. pylori. The enhanced AGS cell invasiveness by H. pylori was partially abrogated by an NAC and BAY11-7082 treatment. These results suggest that the ROS and NF-kappaB signaling pathway is important in H. pylori-induced uPAR expression and the increased cell invasiveness of human gastric cancer AGS cells. SN - 1107-3756 UR - https://www.unboundmedicine.com/medline/citation/17334646/Helicobacter_pylori_stimulates_urokinase_plasminogen_activator_receptor_expression_and_cell_invasiveness_through_reactive_oxygen_species_and_NF_kappaB_signaling_in_human_gastric_carcinoma_cells_ L2 - http://www.spandidos-publications.com/ijmm/19/4/689 DB - PRIME DP - Unbound Medicine ER -