Objective Adenocarcinoma of the stomach has been established as a consequence of gastric infection with Helicobacter pylori(H.pylori).The specific role of H.pylori in the pathogenesis is unknown yet.Recent studies indicate that expression of mitogen inducible cyclooxygenase-2(COX-2) occurs in gastrointestinal tumors.The purpose of the present study was to investigate expression of COX-2 protein in the human stomach with or without H.pylori infection.Methods Twenty-seven subjects who were asymptomatic referred to the hospital for healthy examination including endoscopic screening.Biopsy specimens were obtained from the subjects without any macroscopic lesions,such as peptic ulcer or gastric malignancies.H.pylori infection was determined by rapid urease test(CLO test),bacterial culture and histology(Giemsa staining).Expression of COX-2 was evaluated by immunohistochemistry using the avidin-biotin-peroxide complex(ABC) method The association between COX-2 expression and H.Pylori infection was assessed by Fisher's exact test.A P value less than 0.05 was considered to be statistically significant.Results specific immunostaining for COX-2 was observed in antral mucosa of 18 subjects infected with H.pylori COX-2 was expressed in gastric mucosal epithelia,mainly in the foveolar epithelial cells.Furthermore,COX-2 was also observed in the neck cells of the gastric glands and inflammatory mononuclear cells beneath the mucosal epithelia.Expression of COX-2 was never found in the gastric mucosa of H.pylori-negative subjects.A positive association of H.pylori infection with COX-2 expression was statistically significant(P

Background:Recent studies have showed that high homocysteine(Hcy)level can increase the risk of gastric cancer, but no related studies have been reported on role of Hcy in gastric precancerous diseases. Aims:To investigate the role of serum Hcy,folic acid and vitamin B12 in patients with gastric cancer and precancerous diseases. Methods:Eighty-six normal controls,46 atrophic gastritis,46 gastric ulcer,31 gastric polyp,52 gastric cancer patients diagnosed by gastroscopy and pathology were enrolled. Serum levels of Hcy,folic acid and vitamin B12 were determined,and their correlations with clinicopathological features in gastric cancer were analyzed. Results:Compared with normal controls, serum Hcy level in patients with atrophic gastritis and gastric cancer was significantly increased(P < 0. 05);serum folic acid and vitamin B12 levels in patients with gastric ulcer,gastric polyp and gastric cancer were significantly decreased(P <0. 05). Serum Hcy level in patients with gastric cancer was positively correlated with depth of tumor infiltration,TNM staging and lymph node metastasis(P < 0. 05),however,serum folic acid and vitamin B12 levels had no correlation with clinicopathological features. Conclusions:Hcy level is increased in chronic atrophic gastritis,gastric cancer;levels of folic acid and vitamin B12 are decreased in gastric ulcer,gastric polyp and gastric cancer. High level of Hcy is involved in infiltration and metastasis of gastric cancer. Intervention in patients with high level of Hcy,low levels of folic acid and vitamin B12 might be an effective strategy for the prevention and treatment of gastric cancer and precancerous diseases.

Objective Cyclooxygenase (COX), the key enzyme for synthesis of prostaglandins (PGs), exists in two isoforms (COX 1 and COX 2). Conventional non steroidal anti inflammatory drugs (NSAIDs) inhibit both COX 1 and COX 2 activities and induce serious gastrointestinal side effects. Specific COX 2 inhibitors are expected to cause fewer gastric side effects. The aim of this study was to investigate the effects of specific and non specific COX 2 inhibitors on gastric wound healing following acid induced injury. Methods Male Sprague Dawley rats were given 1 ml of 0.6 mol/L hydrochloric acid (HCl) into the stomach. Levels of COX 1 and COX 2 in gastric mucosa were analyzed using western blotting and immunohistochemical staining. At 10 minutes after the administration of the acid, the animals were given 0.4, 4 and 40 mg/kg of NS 398 (NS) or 40 mg/kg of indomethacin (IM). Control group was given 1% arabic gum (AG) in a volume of 5 ml/kg. The rats were sacrificed and laparotomized before and at 1, 3, 6, 12, 24, 48 h after acid administration. Lesion index (LI) was measured and morphological changes of gastric mucosa were assessed under light microscopy. Results Expression of COX 2 was enhanced mainly in surface epithelial cells and neck cells after HCl administration. NS and IM delayed the healing of gastric injury. At 12 h after acid administration, LI was (1.42 ? 0.23)% and (1.42 ? 0.29)% in the groups treated with 4 and 40 mg/kg of NS respectively, and (1.62 ? 0.44)% in the group treated with 40 mg/kg of IM, which was significantly higher than that in control group [(0.58?0.24)%, P

Objective To establish a mouse model of biliogenic severe acute pancreatitis (SAP) by using a self-made device for retrograde injection of sodium taurocholate into common bile duct,and to investigate the improvement of the device on retrograde injection of sodium taurocholate into common bile duct and its safety.Methods Thirty-six adult male ICR mice were randomly divided into biliogenic SAP model group and sham group,with 18 mice in each group.A 40 U disposable insulin syringe,a 200 μL tips and a 25 μL micro-syringer were used as basic materials for making the mouse common bile duct injection device [National Utility Model Patent (ZL 2014 2 0694365.4)].In model group,3.5％ sodium taurocholate (1 mL/kg) was injected retrogradely into the common bile duct of mice,whilst in sham group,the mice underwent the injection of equal amount of normal saline instead.Six mice in each group were sacrificed at 6,24 and 48 hours after operation,and the abdominal aortic blood was collected.Serum amylase (AMY),alanine aminotransferase (ALT),creatine kinase-MB (CK-MB),serum creatinine (SCr),oxygenation index (PaO2/FiO2) as well as serum Ca2+ were.determined.Pathological change in pancreas was observed under conventional light microscopy after hematoxylin and eosiu (HE) staining,and the impairment was evaluated by a widely used score system.Results The injection device was easily placed into mouse common bile duct under macroscopic observation.Six hours after operation,the levels of serum AMY,ALT and SCr in model group were significantly higher than those in sham group,and peaked at 24 hours,and they slightly decreased at 48 hours,which were still significantly higher than those of the sham group [24-hour AMY (U/L):7 325 ± 1 154 vs.1 737 ± 197,24-hour ALT (U/L):176.0±5.0 vs.38.3 ± 2.0,24-hour SCr (tmol/L):46.3 ± 1.5 vs.17.8 ±0.6,all P ＜ 0.01].The level of CK-MB at 6 hours in the model group was significantly higher than that of the sham group,and peaked at 48 hours (U/L:749.8±42.2 vs.383.3±35.5 at 6 hours,3 340.1 ± 203.6 vs.704.6 ± 63.5 at 48 hours,both P ＜ 0.01).PaO2/FiO2 at 6 hours after the operation in model group was significantly lower than that of sham group,then it began to rise at the similar level in sham group at 48 hours [mmHg (1 mmHg =0.133 kPa):327.5±33.8 vs.424.8±31.0 at 6 hours,P ＜ 0.01;429.8 ±41.8 vs.464.7±43.3 at 48 hours,P ＞ 0.05].Ca2+ level in model group was continuously decreased after operation,and it was significantly lower than that of sham group at 48 hours (mmol/L:1.58 ± 0.14 vs.2.45 ± 0.21,P ＜ 0.01).The pancreatic edema was obvious after operation in sham group,with the observation time prolongation,the changes were gradually improved;pancreatic focal necrosis was found at 6 hours after operation in model group,and it was secondary aggravated,and pancreatic lobule structure disappearance and inflammatory cells extensive infiltration was found at 48 hours.Pathological score of the model group was significantly higher than that of sham group at each time point,and peaked at 48 hours (13.3 ±0.3 vs.3.0±0.1,P ＜ 0.01).Conclusion It is a highly efficient and low-cost way to induce biliogenic SAP in mice by retrograde injection of 3.5％ sodium deoxycholate into common bile duct via the self-made injection device,and the model conformed to the clinical characteristics of biliogenic SAP.

Objective: To establish the method of percutaneous endoscopic gastrostomy(PEC) and percutaneous endoscopic jejunostomy (PEJ) for enteral nutrition. Methodes: PEG tubes were placed in 114 patients with Pull method. On the foundation of PEG, PEJ tubes were placed in 26 patients by pushing endoscopy to send tubes through Treitz ligment with usingthe the clip. Results: All PEG insertion was performed successfully. PEJ tubes were placed successfully with a new method in 26 patients. 15 patients had a little blooding and 8 patients had slight infection. 21 patients had respiratory tract infection and had been cured by using antibiotic. There was no severe complication. Conclusion: PEG is simple、safe、efficient. The new method of PEJ is feasible.

Objective To investigate the clinical and histopathologic features of patients with primary gastrointestinal malignant lymphoma ( PGIML). Methods The clinical and histopathologic data of 22 patients with PGIML were reviewed and analyzed retrospectively. All cases were confirmed with histological specimen obtained from endoscopic biopsies or surgery. Results Abdominal pain was the most common presenting symptom, seen in 15 of 22 patients (68.2% ). The incidence of PGIML was highest in stomach, seen in 12 of 22 patients (54. 5% ). Modularity of the mucosal surface was the most common endoscopic finding, seen in 15 of 21 patients (71. 4% ). The positive rate of endoscopic biopsy for the diagnosis of PGIML was 52. 6% (10/19 biopsy cases). All cases were non-Hodgkins lymphomas ( NHL). Twenty cases were muco-sa associated lymphoid tissue (MALT) lymphoma, and 13 of 20 cases were extra-nodal marginal zone B-cell lymphoma of MALT. Conclusions Abdominal pain is the most common symptom and the stomach was the most common location in PGIML. Extra nodal marginal zone B-cell lymphoma of MALT is the main histopathologic feature. The prognosis of PGIML is related to the surgical procedure and the post operative chemotherapy.

AIM: To clarify the effects of gastrin on t he expression of cyclooxygenase (COX) and several growth factors in rat gastric mu cosa. METHODS: Male Sprague Dawley rats were fasted for 24 hours and s ubcutaneously injected with saline or gastrin 17 at doses of 1 ?g/kg, 10 ?g/kg and 100 ?g/kg, respectively. The expression of COX-1, COX-2, heparin-binding e p idermal growth factor-like growth factor (HB-EGF) and hepatocyte growth factor ( HGF) in the gastric mucosa were examined using Western blotting and immunohistoc hemical staining. Effects of a potent gastrin receptor antagonist YM022 on the e xpression of COX-1, COX-2, HB-EGF and HGF in gastric mucosa were also evaluated. RESULTS: Gastrin dose-dependently increased the expression of C OX-2 and HB-EGF in rat gastric mucosa while the expression of COX-1 and HGF did not change significantly after treatment with gastrin. However, pretreatment wit h YM022 dose-dependently abolished the up-regulation of COX-2 and HB-EGF express ion induced by gastrin. CONCLUSIONS: This study demonstrates that gastrin up-regulates C OX-2 and HB-EGF expression in rat gastric mucosa, indicating that COX-2 and HB-E GF are involved in pathogenesis of the gastrin-related gastric mucosal hyperplas ia and carcinoma of stomach.

AIM: To clarify the effects of specific and non-specific cyclooxygenase-2 (COX-2) inhibitors on gastric epithelial cell proliferating and gastric healing following acid-induced damage. METHODS: Male Sprague-Dawley rats were given 1 mL of 0.6 mol/L hydrochloric acid (HCl) into the stomach. Ten minutes after the administration of the acid,the animals were given NS-398 (COX-2 inhibitor) or indomethacin. Levels of COX-1 and COX-2 in the gastric mucosa before and after HCl-administration were analyzed using western blotting and immunohistochemical staining. Proliferating cell nuclear antigen (PCNA) was detected using immunohistochemistry for epithelial cell proliferation. Gastric lesion index (LI) was assessed using planimetry. RESULTS: Expression of COX-2 was enhanced mainly in surface epithelial cells and neck cells following HCl-administration. At 24 h following acid administration,PCNA labeling index (PCNA-LI) was (22.72?4.33) % and (21.98?5.18) % in the groups treated with 40 mg/kg of NS-398 and indomethacin respectively,which was significantly lower than that in the control group [ (34.46?3.61) %,P

Objective:To evaluate the efficacy and safety of lopinavir/ritonavir (LPV/r) and arbidol in treating patients with coronavirus disease 2019 (COVID-19) in the real world.Methods:The clinical data of 178 patients diagnosed with COVID-19 admitted to Guangzhou Eighth People′s Hospital from January 20 to February 10, 2020 were retrospectively analyzed. According to patient′s antiviral treatment regimens, 178 patients were divided into 4 groups including LPV/r group (59 patients), arbidol group (36 patients), LPV/r plus arbidol combination group (25 patients) and the supportive care group without any antiviral treatment (58 patients). The primary end point was the negative conversion time of nucleic acid of 2019 novel coronavirus (2019-nCoV) by pharyngeal swab.Results:The baseline parameters of 4 groups before treatment was comparable. The negative conversion time of viral nucleic acid was (10.20±3.49), (10.11±4.68), (10.86±4.74), (8.44±3.51) days in LPV/r group, arbidol group, combination group, and supportive care group respectively ( F=2.556, P=0.058). There was also no significant difference in negative conversion rate of 2019-nCoV nucleic acid, the improvement of clinical symptoms, and the improvement of pulmonary infections by CT scan ( P>0.05). However, a statistically significant difference was found in the changing rates from mild/moderate to severe/critical type at day 7 (χ 2=9.311, P=0.017), which were 24%(6/25) in combination group, 16.7%(6/36) in arbidol group, 5.4%(3/56) in LPV/r group and 5.2%(3/58) in supportive care group. Moreover, the incidence of adverse reactions in three antiviral groups was significantly higher than that in supportive care group (χ 2=14.875, P=0.002). Conclusions:Antiviral treatment including LPV/r or arbidol or combination does not shorten the negative conversion time of 2019-nCoV nucleic acid nor improve clinical symptoms. Moreover, these antiviral drugs cause more adverse reactions which should be paid careful attention during the treatment.