[Show abstract][Hide abstract] ABSTRACT: Osteopontin (OPN) and autotaxin (ATX) are important chemokines involved in the survival, proliferation, migration, invasion, and metastasis of many cancer cells. The focus of the study was to investigate the relationship between OPN and ATX-lysophosphatidic acid (LPA) axis. The expression of OPN and its cellular cascades were determined by western blot and real-time quantitative transcription polymerase chain reaction (real-time PCR) analyses. Cell migration activity was determined by a Transwell-migration assay. In comparison with nontreated cells, we found that the ATX-LPA axis upregulated OPN expression by 2.91-fold in protein levels and 2.52-fold in mRNA levels. The ATX-LPA axis activates Akt and ATX/LPC-induced OPN expression in SMMC7721 cells was largely reduced by the inhibitors of phosphatidylinositol 3-kinase (PI3K)/Akt or LPA receptor. This study provides the first evidence that the induction of the OPN expression by ATX-LPA axis was mediated by the activation of Akt through LPA receptors and OPN was required for migration of SMMC7721 cells induced by ATX-LPA axis.
Preview · Article · Mar 2011 · The Anatomical Record Advances in Integrative Anatomy and Evolutionary Biology
[Show abstract][Hide abstract] ABSTRACT: Whether gastric atrophy (GA) and intestinal metaplasia (IM) are reversible after the eradication of Helicobacter pylori remains controversial. The purpose of this meta-analysis was to systematically review histological alterations in GA and IM by comparing histological scores before and after H. pylori eradication.
English-language articles in the medical literature containing information about the association between infection with H. pylori and gastric premalignant lesions (i.e. GA and IM) were identified by searching the Medline, PubMed, and EMBASE databases with suitable key words up to December 2009. Review Manager 4.2.8 was used for the meta-analysis.
Twelve studies containing a total of 2,658 patients were included in the first meta-analysis. Before treatment, 2,648 patients had antrum GA, 2,401 patients had corpus GA, 2,582 patients had antrum IM, and 2,460 patients had corpus IM. Comparing the histological alterations before and after H. pylori eradication, the pooled weighted mean difference (WMD) with 95% CI for antral GA was 0.12 (0.00-0.23), p = 0.06. For corpus GA, the pooled WMD was 0.32 (0.09-0.54), p = 0.006. For antral IM, the pooled WMD was 0.02 (-0.12-0.16), p = 0.76, and for corpus IM, the pooled WMD was -0.02 (-0.05-0.02), p = 0.42.
Our study shows that eradication of H. pylori results in significant improvement in GA in the corpus but not in the antrum; it also does not improve gastric mucous IM. Consequently, all patients with GA in the corpus should be tested for H. pylori infection, and eradication therapy should be prescribed for H. pylori-positive patients in those with GA in corpus.
[Show abstract][Hide abstract] ABSTRACT: The use of prophylactic antibiotics to prevent infection and reduce mortality in patients with acute necrotizing pancreatitis (ANP) remains controversial. The aim of this study is to perform a systematic review of the data from randomized controlled trials to compare prophylactic antibiotic treatment of patients with ANP versus placebo.
A computerized literature search was conducted using Medline, PubMed, EMBase and Cochrane Central Register of Controlled Trials (CENTRAL) for relevant articles published in English from January 1990 to March 2010. MeSH terms and keywords used to identify articles included 'antibiotic', 'pancreatitis', and 'randomized'. Outcome measures were infected pancreatic necrosis (IPN), mortality, nonpancreatic infection (NPN) and need for surgical intervention.
Nine trials involving 564 patients were included. Analysis suggested that IPN was significantly reduced by treatment with antibiotics (RR 0.73, 95% CI 0.54-0.98, p = 0.04). Mortality (p = 0.1), NPN (p = 0.07), and need for surgical intervention (p = 0.17) were not significantly reduced by antibiotic treatment. Subsequent subgroup analysis confirmed that antibiotics were statistically superior to controls in reducing of infected necrosis (p = 0.003) and also mortality (p = 0.02) in single-blinded randomized controlled trials.
Prophylactic antibiotic treatment reduced occurrence of IPN, but did not affect mortality, NPN, or surgical intervention in patients with ANP.
No preview · Article · Nov 2010 · Digestive surgery
[Show abstract][Hide abstract] ABSTRACT: The main aim of this meta-analysis was to compare the efficacy and safety of clarithromycin and second-generation fluoroquinolone-based triple therapy vs. bismuth-based quadruple therapy for the treatment of persistent Helicobacter pylori infection.
A systematic literature search was conducted for articles and abstracts from 1981 to March 2009 using Medline, PubMed, EMBase, Google Scholar and CNKI (Chinese), Wanfang (Chinese) digital database and recent Digestive Disease Week, United European Gastroenterology Week, and European Helicobacter Study Group conferences were also performed. Boolean operators (NOT, AND, OR) were used in succession to narrow and widen the search. Sixteen articles and four abstracts met the inclusion criteria, and were included in the meta-analysis by using Review Manager 4.2.8.
The eradication rates demonstrated that clarithromycin-based triple therapy is inferior to bismuth-based quadruple therapy (OR = 0.53, 95% CI: 0.35-0.80, P = 0.002). Thirteen RCTs compared levofloxacin-based triple therapy vs. bismuth-based quadruple therapy, the eradication rates of the two regimens were shown to have no significant difference (OR = 1.43, 95% CI: 0.82-2.51, P = 0.21). But the eradication rates demonstrated superiority of the 10-day levofloxacin-based triple therapy over 7-day bismuth-based quadruple therapy (OR = 4.79, 95% CI: 2.95-7.79, P < 0.00001). Levofloxacin-based triple therapy was better tolerated than bismuth-based quadruple therapy with lower rates of side effects (OR = 0.41, 95% CI: 0.27-0.61, P < 0.0001), and lower rates of discontinuation of therapy due to adverse events (OR = 0.13, 95% CI: 0.06-0.33, P < 0.0001). Furthermore, our meta-analysis suggested that the eradication rates of the moxifloxacin-based triple therapy has a slight superiority to bismuth-based quadruple therapy, but there was no significant difference between them.
Second-generation fluoroquinolone-based triple therapy can be suggested as the regimen of choice for rescue therapy in the eradication of persistent H. pylori infection especially 10-day levofloxacin-based triple therapy.
No preview · Article · Jul 2010 · Wiener klinische Wochenschrift
[Show abstract][Hide abstract] ABSTRACT: The prevalence of Helicobacter pylori is higher in developing countries. The aim of this study was to investigate the prevalence and risk factors of H. pylori infection in areas with high prevalence of gastric cancer in Jiangsu Province, China.
A prospective epidemiologic survey of H. pylori infection was accomplished in a natural population of 1457 individuals in Xiangshui and Gaoyou counties, Jiangsu Province, China. Questionnaires and laboratory tests for H. pylori infection ((13)C-urea breath test and serum IgG antibodies to H. pylori) were used and performed, respectively.
Among 1371 subjects who completed questionnaires and H. pylori detection, 851 (62%) were H. pylori positive. The prevalence reached a peak at the age of 30-40 years (67%). There was no sex difference. The annual family income level was shown to be positively correlated with the risk of H. pylori infection. The prevalence of H. pylori infection was also associated with family size, education level, and several diet-related factors, such as the number of times cooked rice and potatoes eaten per week, and a family history of stomach diseases. Compared to nonsymptomatic individuals, people with dyspeptic symptoms (nausea, vomiting, and belching) presented a low prevalence of H. pylori infection. No association between H. pylori prevalence and smoking or drinking was found. Using multivariate logistic regression analysis, annual family income and education level were the independent predictors for H. pylori infection.
High prevalence of H. pylori infection was found in areas with a high risk of gastric cancer and was related to several risk factors. The underlying mechanisms need to be further investigated.