RRC ID 38243
著者 Fujimoto D, Hirono Y, Goi T, Katayama K, Matsukawa S, Yamaguchi A.
タイトル The activation of Proteinase-Activated Receptor-1 (PAR1) mediates gastric cancer cell proliferation and invasion.
ジャーナル BMC Cancer
Abstract BACKGROUND:In addition to regulating platelet function, the G protein-coupled sub-family member Proteinase-activated receptor-1 (PAR1) has a proposed role in the development of various cancers, but its exact role and mechanism of action in the invasion, metastasis, and proliferation process in gastric cancer have yet to be completely elucidated. Here, we analyzed the relationship between PAR1 activation, proliferation, invasion, and the signaling pathways downstream of PAR1 activation in gastric cancer.
METHODS:We established a PAR1 stably transfected MKN45 human gastric cancer cell line (MKN45/PAR1) and performed cell proliferation and invasion assays employing this cell line and MKN28 cell line exposed to PAR1 agonists (alpha-thrombin and TFLLR-NH2). We also quantified NF-kappaB activation by electrophoretic mobility shift assay (EMSA) and the level of Tenascin-C (TN-C) expression in conditioned medium by ELISA of MKN45/PAR1 following administration of alpha-thrombin. A high molecular weight concentrate was derived from the resultant conditioned medium and subsequent cultures of MKN45/PAR1 and MKN28 were exposed to the resultant concentrate either in the presence or absence of TN-C-neutralizing antibody. Lysates of these subsequent cells were probed to quantify levels of phospholyrated Epidermal Growth Factor Receptor (EGFR).
RESULT:PAR1 in both PAR1/MKN45 and MKN28 was activated by PAR1 agonists, resulting in cell proliferation and matrigel invasion. We have shown that activation of NF-kappaB and EGFR phosphorylation initially were triggered by the activation of PAR1 with alpha-thrombin. Quantitative PCR and Western blot assay revealed up-regulation of mRNA and protein expression of NF-kappaB target genes, especially TN-C, a potential EGFR activator. The suppressed level of phosphorylated EGFR, observed in cells exposed to concentrate of conditioned medium in the presence of TN-C-neutralizing antibody, identifies TN-C as a putative autocrine stimulatory factor of EGFR possibly involved in the sustained PAR1 activation responses observed.
CONCLUSION:Our data indicate that in gastric carcinoma cells, PAR1 activation can trigger an array of responses that would promote tumor cell growth and invasion. Over expression of NF-kappaB, EGFR, and TN-C, are among the effects of PAR1 activation and TN-C induces EGFR activation in an autocrine manner. Thus, PAR1 is a potentially important therapeutic target for the treatment of gastric cancer.
巻・号 10
ページ 443
公開日 2010-8-19
DOI 10.1186/1471-2407-10-443
PII 1471-2407-10-443
PMID 20723226
PMC PMC2933627
MeSH Blotting, Western Cell Line, Tumor Cell Movement* Cell Proliferation* Culture Media, Conditioned / pharmacology Electrophoretic Mobility Shift Assay Enzyme-Linked Immunosorbent Assay ErbB Receptors / genetics ErbB Receptors / metabolism Flow Cytometry Humans Immunoenzyme Techniques NF-kappa B / genetics NF-kappa B / metabolism Neoplasm Invasiveness Phosphorylation / drug effects RNA, Messenger / genetics Receptor, PAR-1 / agonists Receptor, PAR-1 / genetics Receptor, PAR-1 / metabolism* Reverse Transcriptase Polymerase Chain Reaction Signal Transduction Stomach Neoplasms / metabolism* Stomach Neoplasms / pathology* Tenascin / genetics Tenascin / metabolism Thrombin / pharmacology
IF 3.15
引用数 28
WOS 分野 ONCOLOGY
リソース情報
ヒト・動物細胞