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Kagawa, Japan

Mori H.,1750 1 Ikenobe | Kobara H.,1750 1 Ikenobe | Fujihara S.,1750 1 Ikenobe | Nishiyama N.,1750 1 Ikenobe | And 5 more authors.
BMC Gastroenterology | Year: 2012

Background: Endoscopic submucosal dissection (ESD) has typically been performed using air insufflation. Recently, however, insufflation of CO 2 has been increasingly used to avoid complications. This prospective study was designed to compare the CO 2 concentration, intestinal volume, and acid-base balance using the duodenal balloon procedure.Methods: From June 2010 to February 2011, we enrolled 44 patients with esophageal or gastric cancer and randomly allocated them into two groups. We compared 22 patients undergoing CO 2-insufflated ESD with a balloon placed into the duodenal bulb (duodenal balloon group) and 22 patients undergoing regular CO 2-insufflated ESD (regular group). Three-dimensional computed tomography was performed before and after the procedure to measure intestinal volume. CO 2 concentrations were measured every 10 minutes. The visual analogue system (VAS) scores for postoperative symptoms were recorded, and pH was measured immediately after the procedure. This was a prospective case control study randomized by the sealed envelope method.Results: Intestinal CO 2 gas volume before and after ESD was lower in the duodenal balloon group than in the regular group (P = 0.00027). The end-tidal CO 2 level was significantly lower in the duodenal balloon group than in the regular group (P = 0.0001). No significant differences in blood ΔpH were found between the two groups. The VAS score for the occurrence of nausea due to abdominal distension after ESD indicated a significant difference (P = 0.031).Conclusions: ESD using the duodenal balloon occlusion method is effective for reduction of post-ESD intestinal CO 2 gas volume, resulting in a lower total amount of CO 2 insufflation during ESD and reducing harmful influences on the human body to some extent. © 2012 Mori et al; licensee BioMed Central Ltd.

Zhang X.,1750 1 Ikenobe | Liu D.,Kagawa University | Hayashida Y.,1750 1 Ikenobe | Okazoe H.,1750 1 Ikenobe | And 4 more authors.
International Journal of Molecular Sciences | Year: 2015

G protein-coupled receptor 87 (GPR87) is a newly deorphanized member of the cell surface molecule G protein-coupled receptor family. GPR signaling was shown to play a role in promotion of cell growth and survival, metastasis, and drug resistance. The overexpression of GPR87 has also been reported in many malignant tumors including bladder cancer. The aim of the present study is to examine the effect of silencing GPR87 expression with a replication-deficient recombinant adenoviral vector expressing short hairpin RNA targeting GPR87 (Ad-shGPR87) and to explore the underlying molecular mechanisms in bladder cancer cells. Six GPR87-expressing human bladder cancer cells, HT1197, HT1376, J82, RT112, TCCSUP and UMUC3, were used. Infection with Ad-shGPR87 effectively downregulated the GPR87 expression, and significantly reduced the percentage of viable cells in 4 of 6 cell lines as detected by an MTT assay. Significant inhibition on cell proliferation with Ad-shGPR87 was observed in the wild-type p53 bladder cancer cell lines (HT1197, RT112, TCCSUP and UMUC3), but not in the mutant p53 cells (HT1376 and J82). As represented by a wild-type p53 RT112 cell, Ad-shGPR87infection significantly enhanced p53 and p21 expression and caused caspase-dependent apoptosis. Furthermore, the treatment with Ad-shGPR87 exerted a significant antitumor effect against the GPR87-expressing RT112 xenografts. GPR87 appeared to be a promising target for gene therapy, and Ad-shGPR87 had strong antitumor effects, specifically anti-proliferative and pro-apoptotic effects, against GPR87-expressing human bladder cancer cells. © 2015 by the authors; licensee MDPI, Basel, Switzerland.

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