RÉSUMÉ
Objective To investigate the safety and effectiveness of endoscopic resection of tumors originated from gastric fundus muscularis propria.Methods Data of 53 patients with tumors originated from gastric fundus muscularis propria detected by endoscopic ultrasonograpy,treated by endoscopic resection and followed up at our hospital between January 2012 and June 2014 were reviewed.The postoperative pathology and complications were retrospectively analyzed to evaluate the therapeutic effect and safety.Results The procedure was successfully performed on all patients and all lesions were removed in one procedure.The lesion size ranged from 0.5 to 4.5 cm and the operation time was 25-155 min[mean(46.7 ±18.2)min].Mild bleeding (5 ~150 ml)occurred in all cases,which was successfully managed by argon plasma coagulation,hot biopsy probe or endoclip.Perforation occurred in 8 patients(8 /53),seven of whom were closed with titanium clips and titanium clips combined with nylon cord.Laparoscopic intervention was applied to 1 case because of severe perforation.Gastrointestinal decompression,acid suppression with proton pump inhibitors and antibiotics were performed on all cases.No severe hemorrhage occurred.The average length of hospitalization was (5.3 ± 1.4)days(3-14 d).Pathology confirmed 46 cases of gastrointestinal stromal tumors and 7 cases of leiomyoma. The patients were followed up for 3 to 27 months,and no tumor residue or recurrence was observed. Conclusion Endoscopic resection is a method not only to get the accurate pathologic diagnosis but also to meet principle of the local resection for stomach.It is safe,effective and worthy of recommendation.
RÉSUMÉ
<p><b>OBJECTIVE</b>To investigate the effect of silencing histone deacetylases 1 (HDAC1) gene by RNA interference on the proliferation, apoptosis and histone modulation in gastric cancer MGC-803 cell line.</p><p><b>METHODS</b>The optimal segment targeting HDAC1 gene was designed and transfected into MGC-803 cells by Lipofectamine TM2000. HDAC1 mRNA and protein in the transfected cells were detected by RT-PCR and Western blotting, respectively. The growth inhibition of MGC803 cells was evaluated by MTT assay and the cell apoptosis was detected with TUNEL assay. The expression of Bcl-2, procaspase-9, procaspase-3, c-Myc, histone acetylation of H3, H4, and histone methylation of H3K9 was detected by Western blotting.</p><p><b>RESULTS</b>The siRNA targeting HDAC1HDAC1 markedly suppressed mRNA expression, inhibited cell proliferation and induced apoptosis of MGC-803 cells in a concentration manner. Transfection of the cells with HDAC1 siRNA at 0, 30, 60, and 120 nmol/L for 24 h resulted in a cell apoptotic rate of (4.8∓2.7)%, (18.5∓3.5)%, (41.4∓4.3)%, and (59.2∓5.5)%, respectively, and caused down-regulation of the expressions of Bcl-2, proCaspase9, proCaspase3 and c-Myc, upregulation of histone acetylation of H3, H4, and down-regulation of histone methylation of H3K9.</p><p><b>CONCLUSION</b>Silencing HDAC1 gene expression with HDAC1 siRNA can promote histone H3 and H4 acetylation and inhibit histone methylation of H3K9 to suppress the proliferation and induce apoptosis of gastric cancer MGC-803 cells.</p>