Altered Neuronal Activity in the Central Nucleus of the Amygdala Induced by Restraint Water-Immersion Stress in Rats / 神经科学通报·英文版

Restraint water-immersion stress (RWIS), a compound stress model, has been widely used to induce acute gastric ulceration in rats. A wealth of evidence suggests that the central nucleus of the amygdala (CEA) is a focal region for mediating the biological response to stress. Different stressors induce distinct alterations of neuronal activity in the CEA; however, few studies have reported the characteristics of CEA neuronal activity induced by RWIS. Therefore, we explored this issue using immunohistochemistry and in vivo extracellular single-unit recording. Our results showed that RWIS and restraint stress (RS) differentially changed the c-Fos expression and firing properties of neurons in the medial CEA. In addition, RWIS, but not RS, induced the activation of corticotropin-releasing hormone neurons in the CEA. These findings suggested that specific neuronal activation in the CEA is involved in the formation of RWIS-induced gastric ulcers. This study also provides a possible theoretical explanation for the different gastric dysfunctions induced by different stressors.

Triple and Quadruple Eradication Therapy for H. pylori in Iraqi Patients with Peptic Ulcer Disease a Comparative Study.

The eradication of H. pylori has become an important issue; since Helicobacter pylori infection can cause chronic gastritis, peptic ulcer, gastric cancer and (MALT) lymphoma. Standard triple therapy efficacy has decreased gradually worldwide during the last decade and quadruple therapy is recommended as an alternate treatment option for the management of H. pylori. The aim of this study was to compare between triple and quadruple therapy for eradication of H. pylori in Iraqi patients with peptic ulcer disease, and to treat the patients who relapsed after triple therapy. In addition to that; response to therapy (triple and quadruple) have been evaluated according to the Body Mass Index (BMI). A prospective case controlled study was carried on 60 patients who had peptic ulcer disease and positive H. pylori infection confirmed by (histology; stool antigen test and anti-H. pylori IgG antibody test) patients were divided into 3 groups first group involved 38 patients treated with triple therapy (500 mg clarithromycin capsules; 1 g amoxicillin capsules; and 20 mg esomeprazole capsules) for 14 days. The second group involved 22 patients treated with quadruple therapy (pylera)®; (140 mg bismuth sub citrate potassium, 125 mg metronidazole, and 125 mg tetracycline hydrochloride) for 10 days, while third group involved patients un responding to triple therapy treated with secondline quadruple therapy for 10 days. The results showed that the eradication rate of the per-protocol and intention-to-treat for quadruple therapy was 88.57%, 83.78% respectively which was more than 57.89% per-protocol and 50% intention-to-treat for standard triple therapy with high significant difference (p<0.01). Patients compliance with quadruple and triple therapy was good for the two regimens in spite of the more adverse effect of quadruple regimen compared to triple regimen. On conclusion; the 10 days treatment with quadruple therapy was more effective than 14 days triple therapy that could be attributed to more eradication rate for H. pylori.

Protective Effect of Weidean Tablets on Rats with Stress-induced Gastric Ulceration / 中国药房

OBJECTIVE:To study the protective effect of Weidean tablets on rats with stress-induced gastric ulceration. METH-ODS:Water immersion restraint stress method and empty stomach were employed to establish rat models with gastric ulceration. 60 SD rats were equally randomized into normal control group(isometric sodium chloride injection),model group(isometric sodium chloride injection),ranitidine group(0.015 g/kg),and groups of high,medium and low doses(1.70,0.87 and 0.43 g/kg)of Wei-dean tablets. General situation of stomach was observed .The gastric mucosal injury index,the NO content in serum,and the activi-ties of SOD and iNOS and the contents of MDA and PGE2 in the gastric tissue were detected for rats. Pathomorphological observa-tion of rats’gastric tissues was conducted under the microscope. RESULTS:Compared with normal control group,the rats in the model group had higher gastric mucosal injury index,lower content of NO in serum,and weaker activity of SOD,stronger activity of iNOS,higher content of MDA and PGE2,in the gastric tissue. There was statistical significance (P<0.01 or P<0.05). Dark matter,severe deformation and necrosis of gastric mucosal cells in rats were noted,as well as multiple large-area superficial ulcers. Compared with the model group,the rats in groups of high,medium and low doses of Weidean tablets had lower gastric mucosal injury index,higher content of NO in serum,and stronger activity of SOD,weaker activity of iNOS,lower content of MDA and higher content of PGE2,in the gastric tissue. There was statistical significance(P<0.01 or P<0.05). General situation of stomach and the pathomorphological condition of rats’gastric tissues were improved. CONCLUSIONS:Weidean tablets has protective ef-fect to some extent on rats with stress-induced gastric ulceration,the mechanism is related to the improvement of serum levels of anti-oxidation index in rats.

Gastroprotective Effect of Tabernaemontana divaricata (Linn.) R.Br. Flower Methanolic Extract in Wistar Rats.

Tabernaemontana divaricata (L.) R.Br belonging to Apocynaceae family is traditionally used by people in many parts of the world to treat various disorders. The present study was undertaken to investigate anti-ulcer property of Tabernaemontana divaricata flower methanolic extract (TDFME 500 mg/kg, p.o) by pyloric ligation induced gastric ulceration model using Omeprazole (8mg/kg, p.o) as a standard drug in wistar rats. Five parameters i.e., volume of gastric juice, pH, free & total acidities and ulcer index were assessed. The test extract significantly (p< 0.01) decreased volume of gastric juice, free & total acidities and ulcer index. Like standard, it also raised pH of gastric acid. The observed percentage protection for standard and test were 89.84% and 79.53%, respectively. Thus, TDFME 500 mg/kg had a positive effect on all the parameters under study and the results were similar to that of standard. From the above results, it can be concluded that TDFME exhibits remarkable gastroprotective effect.

Antidiabetic and antiulcer effects of extract of eugenia jambolana seed in mild diabetic Rats : Study on gastric mucosal offensive acid-pepsin secretion.

Diabetes has been reported to increase propensity to peptic ulceration through its effect both on offensive and defensive mucosal factors. Seeds of Eugenia jambolana (EJ) have been reported to have both antidiabetic as well as ulcer protective effects. The present study evaluates the antidiabetic effects of ethanolic extract of dried seed kernel of Eugenia jambolana (EJE) and its comparative effect on gastric ulceration and acidpepsin secretion with standard antisecretory FL-blocker. Ranitidine and antidiabetic glibenclamide with a premise that Eugenia jambolana may show better ulcer healing effects by promoting defensive or reducing offensive mucosal factors in mild diabetes (MD) rats. MD was produced in adult rats by administration of streptozotocin (45 mg/kg, ip). EJE was given orally in the doses of 100–400 mg/kg for 10 days and in the dose of 200 mg/kg for 30 days respectively to study its dose- and time-dependent effects on various diabetic parameters like blood glucose, serum cholesterol and triglycerides, insulin level and glycosylated hemoglobin. For ulcer protective and gastric secretion studies, EJE (200 mg/kg) was given orally for 10 days against 2 h cold restraint stress (CRS)-, 4 h pylorus ligation (PL), aspirin (ASP, 200 mg/kg, 4 h) – and 95% ethanol (EtOH, 1 ml/200 g, 1 h)-induced gastric ulcers and offensive acid-pepsin secretion after 4 h PL with cooccurring MD in rats. EJE showed dose-dependent decrease in blood glucose level in MD rats. Blood glucose level remained stable in mild diabetic rats from 3rd day onwards after streptozotocin administration (taken as 1st day for treatment) and EJE (200 mg/kg) showed anti-hyperglycemic effect on 10th day of its administration. Further, EJE in the above dose also decreased cholesterol level with little or no effect on triglycerides level and reversed the decrease and increase in insulin and glycosylated hemoglobin level near to the normal level as observed alter 30 days treatment in MD rats. MD rats exhibited an increased propensity to gastric ulceration induced by CRS, ASP, EtOH and PL and caused increase in acid-pepsin secretion. EJE was not only effective in reversing the increased propensity to ulceration in diabetic rats but also decreased the acid-pepsin output better than glibenclamide. The ulcer protective effect of Eugenia Jambolana seems to be due to its antidiabetic and gastric antisecretory effects.

The effect of colloidal bismuth subcitrate on the gastric blood flow in rats with ethanol-induced gastric ulceration / 中国药理学通报

The effect of colloidal bismuth subcitrate (CBS) in different doses on the rat gastric mucosal blood flow was measure by using laser dopper flow techinique. The results showed that CBS don't increase the gastric mucosal blood flow,but help to maintain a better blood flow in 20 mg,40 mg doses after the ethanol given,andCBS protected gastric mucosa of rat from ethanol-induced ulceration. This paper suggested that CBS may be decreased vascular permeability to protect the gastric mucosal blood from Ethanol damage.