Background and purpose: Currently endoscopic ultrasonography is clinically accepted for preoperative staging of gastric cancers. Endoscopic raucosai resection (EMR) and endoscopic subraucosal dissection (ESD) have been widely applied in the treatment of early gastric cancer. We need to improve the accuracy of pre-operative staging of gastric cancers, especially of early gastric cancers. This paper was to investigate the clinical significance of high frequency endoscopic ultrasound mini probe (UMP) in the preoperative T-staging of gastric cancer. Methods: Both UMP and MSCT were performed in 63 patients with pathologically proven gastric cancer frora Oct. 2008 to Apr.2009, and the results of UMP and MSCT were compared with surgical pathologic findings. Results: The accuracy of UMP and MSCT in T staging was 82.26% (51/62) and 88.71% (55/62) respectively, and there was no statistical difference (P>0.05). The accuracy of UMP and MSCT for early gastric cancer was 100.00% and 88.89% respectively.The accuracy of UMP and MSCT for advanced gastric cancer was 79.25% and 88.68% respectively. Conclusion: UMP appears to have a substantial diagnostic value for early stage gastric cancer. It is the approach of choice for superficial lesions.

An analytical method of fluorescent dye-labeled oligonucleotides was established by ion pair reversed phase high performance liquid chromatography(IP-RP-HPLC) which was improved by optimizing the effects of triethylamine-acetic acid(TEAA)(0-0.15 mol/L), pH(4.5-7.0) and gradient. Comparing the retention of 5, 10 and 15-mer unlabeled oligonucleotides with that of 5'-carboxyfluorescein(5'FAM) labeled oligonucleotides, the mechanism of fluorescent dye-labeled oligonucleotides retention was studied. In addition, TaqMan~(TM) probes as wellas other common fluorescent dye-labeled oligonucleotides were concerned. The results showed that the best resolution of different length fluorescent dye-labeled oligonucleotides was observed under the condition of 0.01 mol/L TEAA and pH 7.0. The retention behavior of fluorescent dye-labeled oligonucleotides was different from that of unlabeled oligonucleotides significantly, and therefore they can be separated completely. The results indicated that the retention of unlabeled oligonucleotides enhanced with the increase of the length of molecule. In contrast, the retention of fluorescent dye-labeled oligonucleotides was reduced with the increase of the length of molecule. For the hydrophobicity of fluorescent dyes made a great impact on the retention, a longer retention time the labeled oligonucleotides would take while the hydrophobicity of fluorescent dyes was higher. However, the effect of the hydrophobicity was limited as the length was increased to a certain level.

Objective To investigate the changes in the expression of macrophage migration inhibitory factor (MIF) mRNA in a rat model of ventilator-induced lung injury.Methods Thirty adult male Sprague-Dawley rats,weighing 2β5-260 g,were randomly divided into 3 groups (n =10 each) using a random number table:control group (group C),small tidal volume (VT) mechanical ventilation group (group S) and large tidal volume mechanical ventilation group (group L).The animals were anesthetized with intraperitoneal ketamine 100 mg/kg,midazolam 0.2 mg/kg and atropine 1.0 mg/kg.The rats were tracheostomized and spontaneous breathing was maintained in group C,while the rats were tracheostomized and mechanically ventilated for 4 h in groups S and L.The tidal volume was 7 ml/kg (group S) or 40 ml/kg (group L),I ∶ E was 1 ∶ 1,RR was 80 bpm and FiO2 was 100％.At 4 h of spontaneous breathing or mechanical ventilation,broncho-alveolar lung lavage fluid (BALF) was collected for determination of the total protein concentration,white blood cell (WBC) counts and concentrations of MIF,IL-6 and IL-1β (by ELISA).Then the rats were sacrificed and the lungs removed for microscopic examination and for determination of wet to dry lung weight ratio (W/D ratio) and expression of MIF mRNA (by RT-PCR).Results Compared with C and S groups,WBC counts,concentrations of total protein,MIF,IL-6 and IL-1β in BALF,and W/D ratio and expression of MIF mRNA in lung tissues were significantly increased in group L (P ＜ 0.05).There was no significant difference in the indexes mentioned above between group C and group S (P ＞ 0.05).The pathological changes occurred in group L.Conclusion The up-regulation of MIF mRNA expression in lung tissues may be involved in the development of ventilator-induced lung injury in rats.

Objective To investigate the role of Toll-like receptor9 (TLR9)-myeloid differentiation factor 88 (MyD88) signal pathway in alveolar macrophages in ventilator-induced lung injury (VILI).Methods 30 adult male Sprague-Dawley (SD) rats were randomly assigned to three groups (with 10 rats in each group).Group A was the control group,with spontaneous respiration after tracheostomy.Rats in group B received mechanical ventilation for 4 hours with normal tidal volume (VT) 7 ml/kg after tracheostomy,and group C rats received mechanical ventilation with VT 40 ml/kg for 4 hours.After termination of ventilation,examination with transmission electron microscopy was performed to observe the ultrastructure changes in alveolar epithelial cell type Ⅱ (AEC Ⅱ) of the lung.Lung wet/dry ratios (W/D) and total protein concentration,the concentration of interleukins (IL-6 and IL-1 β) in bronchoalveolar lavage fluid (BALF) were determined.The protein and mRNA expressions of TLR9,MyD88 and nuclear factor-κB (NF-κB) in alveolar macrophages were assayed by Western Blot and real-time reverse transcription-polymerase chain reaction (RT-PCR).Results The ultrastructure of AEC Ⅱ in the group A and group B was almost normal,whereas the chromatin of the nuclei,the lamellar corpuscles in the cytoplasm,the cell membrane and the microvilli of the AEC Ⅱ in the group C showed injurious changes in various degrees.When the group C was compared with the group A and the group B,it was shown that the W/D ratios (5.54 ± 0.17 vs.4.58 ± 0.17,4.69 ± 0.16) and total protein concentration (g/L:6.33 ± 0.61 vs.0.45 ± 0.05,0.47 ± 0.04),IL-6 (μg/L:1.989 ± 0.103 vs.1.033 ± 0.061,1.010 ± 0.069) and IL-lβ (ng/L:2.79 ±0.25 vs.1.05 ±0.15,1.23 ±0.22) in BALF,the protein expressions of TLR9,MyD88 and NF-κB [TLR9 (A value):0.770 ±0.042 vs.0.300 ±0.027,0.310 ±0.037; MyD88 (A value):0.950 ±0.091 vs.0.560 ±0.082,0.580±0.084; NF-κB(A value):1.020 ±0.076 vs.0.740 ±0.052,0.700 ±0.076] in alveolar macrophages were all increased significantly,and all of which showed significant difference (P＜0.05 or P＜0.01).The mRNA levels of TLR9,MyD88 and NF-κB in alveolar macrophages in the group B were (1.13 ± 0.32),(1.18 ± 0.33),and (1.11 ± 0.22) folds of those of the group A,respectively,but there were no significant differences (all P＞0.05).While the mRNA levels of TLR9,MyD88 and NF-κB of alveolar macrophages in the group C were (8.66 ± 0.69),(6.41 ± 0.53) and (5.29 ± 0.71) folds of those of the group A,respectively,and all of them showed significant difference (all P＜0.01).Conclusion TLR9-MyD88 signaling in alveolar macrophages plays a role in pathogenesis of VILI.