Objective Compared with corresponding monovalent vaccine and pure vaccine vector, live attenuated Salmonella typhimurium expressing bivalent antigens of Helicobacter pylori (H. pylori) , UreB/HpaA was constructed by introducing a flexible and tenacious linker into urease subunit B (UreB) and HpaA of H. pylori and its protection against H. pylori infection in mice was then investigated. Methods UreB/hpaA fusion gene was amplified form H. pylori genomic DNA using sequence overlap extension PCR (SOE-PCR). UreB/HpaA bivalent live vaccine was constructed using attenuated Salmonella typhimurium vaccine vector SL3261, and its stability in vivo was observed in C57BL/6 mice. Evaluation of protection against H. pylori infection was performed in native female C57BL/6 mice by oral immunization with a single dose of the live SL3261 vaccine strain expressing UreB/HpaA (10 8 CFU). Results Sequencing results showed that encoding sequence (GGTGGAGGC) of three glycine residues was inserted into the position between ureB and hpaA fusion gene as an adapter. Bivalent live vaccine strain could be recovered from spleen and Peyer's patches for a longer time (at least 10 days). Bivalent live vaccine induced marked elevation of the levels of serum specific IgG1 and IgG2A in mouse. The immune protection rate of UreB and HpaA bivalent live vaccine was 77.3% (17/22). However only 50.0% (12/24) of the mice immunized with SL3261 vaccine strain expressing UreB and 43.5% (10/23) of the mice immunized with SL3261 vaccine strain expressing HpaA were completely protected against H. pylori challenge. Conclusions Oral immunization of mice with bivalent UreB/HpaA live vaccine could induce protective immunity against H. pylori , and the protection rate of bivalent vaccine appears to be higher than that of monovalent vaccine.

Objective To investigate the expression and clinical significance of ?-catenin and COX-2 in human colorectal carcinoma. Methods [WTBZ]The expression of ?-catenin and COX-2 in 153 colorectal tissue specimens was examined by immunohistochemical technique, and their clinical significance and correlation were statistically analyzed. Results In colorectal adenocarcinoma, the loss of ?-catenin in the cytomembrane was significantly correlated with the differentiated degree, lymph node metastasis and Dukes' stages, while COX-2 overexpression was associated with the Dukes' stages,lymph node metastasis and infiltrating depth. The ectopic expression of ?-catenin was not associated with the COX-2 overexpression. [WTHZ] Conclusion COX-2 and ?-catenin may play a role in the pathogenesis of colorectal adenocarcinoma. The ectopic expression of ?-catenin may be not the main reason of the COX-2 overexpression in colorectal adenocarcinoma. Detection of ?-catenin and COX-2 expression may be helpful for Dukes' staging and evaluating the risk of lymph node metastasis in colorectal adenocarcinoma.

Objective To investigate the effects of oral recombinant attenuated Salmonella ophimurium urease B subunit and catalase in the treatmeat of H.pylori infection in a H.pylori infected mouse model. Methods Thirty C57BL/6 mice were randomized into three groups and challenged twice by oral administration of H.pylori in three days. Four weeks after the second challenge, the mice were immunized by oral administration of recombinant attenuated Salmonella typhimurium urease B subunit (group A), recombinant attenuated Salmonella typhimurium catalase (group B), or saline (group C) respectively, and all mice were sacrificed 4 weeks after the immunization. The stomachs were collected for rapid urease test, modified Giemsa stain and quantitative culture to observe the gastric H.pylori densities, and HE stain was performed to assess the presence of inflammation. Lymph cells from the spleens were served for lymphoproliferation assay. Results Gastric H.pylori densities of group A, B and C were 1.58?10 5 CFU/g, 4.88?10 5 CFU/g and 1.92?10 6CFU/g respectively. H.pylori densities of therapeutic groups were significantly decreased ( P

Objective This study was designed to investigate the expression of human telmerase reverse transcriptase (HTERT) in nasopharyngeal carcinoma (NPC) and its clinical significance.Methods Expression of HTERT in NPC and dysplasia of nasopharyngeal epithelium and chronic inflammation of nasopharyngeal epithelium were determined by immunocytochemical staining.The results were analysed,compared with the clinical TNM stage ,lymph node metastasis ,other places metastasis and prognostic survivals of the NPC patients.Results Positive rate of HTERT in NPC was 83 7%(70/84),while positive rate of HTERT in dysplasia of nasopharyngeal epithelium and chronic inflammation of nasopharyngeal epithelium both were 0 0%(0/8 and 0/16) (P0 05).The median survival of HTERT positive group was shorter than the nagative one.Conclusions Expression of HTERT may be a potential marker for clinical diagnosis of NPC and may has significance in predicting clinical TNM stage, metastasis and prognostic survival of the NPC patients.

Objective To evaluate the diagnostic potential of capsule endoscopies (CE) for suspected small bowel diseases. Methods From September 2002 to June 2003, 23 patients (12 males, 11 females ) , age ranged 10 to 75 years old, with suspected small bowel diseases, were referred to our department to perform CE using Given M2A Video Capsule System. All patients had undergone previous negative endo-scopic evaluation at least once with esophago-gastro-duodenoscopy and total colonoscopy. Additional diagnostic work-up including small bowel enteroclysis, selective angiography, scintigraphy and puch enteroscopy, were performed, totally 36 procedures. Two endoscopists independently reviewed capsule images to arrive a consensus diagnosis. The initial diagnostic yield was quantified, and the value of CE was assessed. Of the 23 patients, 18 suffered from obscure gastrointestinal bleeding, 3 abdominal pain, and 2 chronic diarrhea. Results Twenty-four studies in 23 patients were evaluated. During CE patients have not complained of any uncomfortable feeling, only one patient had repeated the procedure because the capsule lodged at the inferior segment of esophagus near the Z line. Of the 23 patients, 20 had positive findings with a diagnostic yield of 86. 8% . The positive findings included inflammatory lesions in 10 patients (Crohns disease 7 , aphthous ulcer 3 ) , vascular abnormalities 9 ( phlebectasis 6, angioma 2, angiodysplasia 1) , submucosal nodulation 2 , diverticula 2, jejunal stromal tumor 1. Four of 23 patients had more than one lesion. Diagnosis of 6 patients was confirmed by surgery and /or pathology. Nineteen capsules passed in the direction with the camera facing forward, while the other 4 backward. Generally, it delayed in passing through the pylorus and ileocecal valves. Capsules reached cecum in 17 patients (73. 9% ) . Conclusion CE provided clearly the small intestinal images, and is an efficient tool in diagnosing small bowel diseases with a high diagnostic yield.

As one of members of the Notch gene family , Notch-1 signaling pathway plays an important role in the processing of cell proliferation , differentiation , survival and apoptosis .The abnormal expression of Notch-1 is closely related to tumorigenesis and de-velopment .In recent years , many studies have focused on the relationship between the Notch-1 signaling pathway and tumor .This arti-cle reviews the achievement of Notch-1 signaling pathway in recent tumor researches .

Objective To evaluate the effect of neuromuscular electrical stimulation (NMES) on swallowing function in brain injury patients with dysphagia.Methods Sixty-four patients with dysphagia were divided into A group (n=21,stimulated with T =700 ms,R =2 s,frequency =0.19 Hz),B group (n =22,T =700 ms,R =1 s,frequency =0.29 Hz),and C group (n =21,T =340 ms,R =400 ms,frequency =0.68 Hz).One pair of electrodes was placed at the midline under the chin over the submental muscle group.The intensity of stimulation ranged from 5 to 11 mA.The treatments were once a day,5 times a week,with 20 times as one course.The results were assessed with Kubota's water swallowing test before and 4 weeks after treatment.Results The water swallowing test scores were significantly reduced after treatment in all 3 groups,with significantly greater reductions in A group compared with B and C group.The effectiveness rate was 81％ in A group,73％ in B group and 67％ in C group,all statistically significant differences.Conclusion NMES can be an effective and safe treatment for dysphagia after brain injury.NMES appears to be most effective with T =700 ms,R =2 s,and a frequency of 0.19 Hz.

Objective To investigate the effects of Huangqi Sijun Decoction on the levels of thyroxin and cAMP and cGMP in model rats with spleen deficiency syndrome and to explore its therapeutic mechanism.Methods Male SD rats aged three months were randomly divided into 3 groups:normal control group,spleen deficiency model group and Huangqi Sijun Decoction group.The rat models of spleen deficiency syndrome were established by gavage with the decoction of Rhubarb.The serum levels of thyroxin(T4),3,5,3'-triiodothyronine(T3),thyrotropin(TSH)and plasma levels of cAMP,cGMP were determined.Results T3 and T4 were significantly lower but the levels of cAMP and cAMP/cGMP were significantly higher in the spleen deficiency models than those in the normal control group(P

Objective To investigate the expression of HLA-DR and distribution of dendritic cells(DC) in endometrial carcinoma and to evaluate their influence on clinical staging and prognosis.Methods The 86 cases of patients with endometrial carcinomas were detected by immunohistochemical SP method for HLA-DR and S100 positive dendritic cells,and the predictive value in clinical stage and prognosis were analyzed.Results The positive rate of HLA-DR expression was 27.9%(24/86),which was decreased with the increase of clinical staging(P0.05).There were 46.5%(40/86) of the cases with a dense infiltrate(≥10/HPF) of S100 positive DC.There was significant difference on the density of DC infiltrating among the patients with different clinical stages and prognosis(all P

Objective:Investigated the effect of recombinant urease A subunit and catalase vaccines on protection against Helicobacter pylori (HP) infection Methods:Recombinant plasmids expressing UreA or KatA were constructed Expression was induced with IPTG,analyzed by SDS PAGE and Western blot UreA and KatA were purified with Bulk GST purification module Results:The recombinant plasmids could express GST UreA and GST KatA fusion proteins,which accounted for 35% and 19% of total bacteria proteins respectively,and could specially react with antibody against GST The purity of the purified UreA and KatA was over 95% Conclusion:The work laid a foundation for further studies of HP vaccine The recombinant vaccines may play an important role in preventing and treating HP infection and related diseases