Animals ; Toxins, Biological ; chemistry ; physiology

AIM: To elucidate the change in TFF3 mRNA in the lung tissue in chronic obstructive pulmonary disease (COPD) rats. METHODS: A model of rat COPD was established by passive cigarette smoking and intratracheal instillation of lipopolysaccharide. The expression of TFF3 mRNA in the lung tissues was detected by reverse transcription-polymerase chain reaction (RT-PCR). RESULTS: Through a semi-quantitative pathological analysis, mean lung internal lining interval (MLI) in COPD model group was significantly increased compared with healthy control groups; mean alveolar number (MAN) in COPD model group was significantly decreased compared with healthy control group. The expression of TFF3 mRNA decreased significantly in the lung tissue in COPD model group compared with healthy control group. CONCLUSION: The level of TFF3 mRNA expression is possibly related with lung tissue lesion in COPD rats. [

Objective: To investigate the role of NF-?B in signal transduction of hepatocyte apoptosis in liver injury. Methods: A total of 42 Chang-Bai piglets were divided into 7 groups: control group, 1, 2, 4, 8, 12, and 24 hours wound group. The model of intestinal perforations due to abdominal firearm wound was established in wound groups. Hepatic NF-?B activity was measured with immunohistochemical staining and image analysis in all groups. Hepatocyte apoptosis indexes and serum ALT levels were also determined. Results: Levels of hepatic NF-?B activity in wounded groups were significantly elevated compared with control group, and there were two peaks (1 and 8 hours group P

Objective To investigate the feasibility of ultrasound-guided percutaneous drainage for the treatment of peripancreatic abscess. Methods The clinical data of 36 patients with peripancreatic abscess who were admitted to the General Hospital of the Chengdu Military Command were retrospectively analyzed. All the puncture sites were designed according to the region, range and shape of the abscess, and then the angle and the direction of the needle penetration were determined according to the spatial relationship between the puncture site and the abscess. Finally, the drainage tubes were placed under the guidance of the ultrasound. Results The technique was successfully performed on all the patients, and 33 patients were cured with the cure rate of 92%.The mean healing time was 37 days. Three patients were converted to laparotomy because of the unsatisfied therapeutic effects. Enterocutaneous fistula was detected in 3 patients after the surgery and they were cured after receiving nonoperative management. All patients were followed up for 3-48 months, and neither residual abscess nor recurrence was detected. Two patients were complicated with type one diabetes, one with dyspepsia, two with gallstone, and they were cured by symptomatic treatment. The body weights of 27 patients were increased compared to those before the operation. Conclusion Ultrasound-guided percutaneous drainage is effective for the treatment of peripancreatic abscess.

Objective To study the influence of pulsed electromagnetic fields on the expression of type I collagen by bone marrow mesenchymal stem cells and it's mechanism. Methods The bone marrow mesenchymal stem cells of SD rats were isolated and cultured in vitro.The third passage cells were harvested and exposed to pulsed electromagnetic fields(PEMFs)at 15 Hz and 1 mT 8 h/d for 3 days.A semi-quantitative RT-PCR technique was used to measure the type I collagen mRNA expression;ELISA and immunohistochemitistry techniques were used to measure type I collagen expression.Inhibitors and promoters of the cAMP-dependent protein kinase A(cAMP-PKA)pathway were added.After the cAMP-PKA pathway had been inhibited or promoted,the effects of the PEMF on type I collagen expression were measured again using ELISA and immunohistoehemistry.Results PEMFs at 15 Hz and 1 mT induced significant promotion of the expression of type I collagen(P≤0.01)in comparison with the controls. The type I collagen expression was reduced when the cAMP-PKA pathway inhibitor H-89 was added,and raised when the promoter 8-Br-cAMP was added.Conclusion PEMFs at 15 Hz 1 mT can promote type I collagen expression of bone marrow mesenchymal stem cells.and the effect is correlated with the cAMP-PKA pathway.

Objective To investigate the effects of an electromagnetic field on the extra-cellularly regulated kinase(ERK)signalling pathway and to determine the impact of electromagnetic activation on osteogenic proliferation and differentiation in rat bone marrow mesenchymal stem cells.Methods Rat bone marrow mesenchymal stem cells were isolated and cultured in vitro.The third-passage cells were divided into 4 groups(Control,PD98059,EMF and EMF+PD98059).Western blotting Was used to detect the activation of the ERK signal pathway after exposure to an electromagnetic field.MTT assay Was used to determine the activation of proliferation in the celb in the different groups.The cells' alkaline phosphatase activities were also detected. Results (1)The ERK signal pathway in these rat bone marrow mesenchymal stem cells was activated after exposure to a 15 Hz.1 mT,sine wave form electromagnetic field for 5 min.Activation remained high for at least 1 h.PD98059 can effectively block the activation of the ERK signal pathway.(2)Cell proliferation was promoted after exposure to the electromagnetic field,and this effect could be significantly inhibited by PD98059.(3)Alkaline phosphatase was significantly elevated in these bone marrow mesenchymal stem cells after exposure to the electromagnetic field.The activation in the EMF+PD98059 group Was slightly greater than in the EMF group.Conclusion Electromagnetic fields of 15 Hz and 1 mT can activate the ERK signal pathway and alter proliferation and osteogenic differentiation in the bone marrow mesenchymal stem cells of rats.

Adenoma, Pleomorphic ; pathology ; Female ; Humans ; Laryngeal Neoplasms ; pathology ; Larynx ; pathology ; Middle Aged

Objective To investigate the effect of phosphatidylinesitol-3 kinase/serine threonine kinase (PI3K/Akt) signaling pathway on expression of beta-site amyloid precursor protein cleaving enzyme-1 (BACE1) in the hippocampus neurons of rat brain. Methods Forty SD rats were randomly divided into 4 groups: blank control group, sham-operated group, insulin group and wortmannin group. Insulin or the specific inhibitor of PI3K, wortmannin was injected into hippocampus neurons to activate or inhibit the signaling pathway in insulin group or wortmannin group, respectively. Immunoprecipitation and Western blot were used to analyze the proteins levels of PI3K/Akt and BACE1. Results In insulin treatment group,among the proteins downstream of signaling pathway, expression of Akt increased (0. 952±0.060 vs 0.835±0.029,t=4.9150, P=0.0001), phospho-Akt set473 increased (0.800±0.075 vs 0.657± 0.025,t=4.5598, P=0.0002), phospho-GSK-3α decreased (0.604±0.062 vs 0.726±0.041, t= 3.5871, P=0.0018 ), and the expression of mature BACE1 and β-CTF significantly decreased. In wortmannin group, the expression of Akt and phospho-Akt ser473 were inhibited; phospho-GSK-3α increased ; mature BACEI (1.004±0.096) and β-CTF (1.031±0.048) increased (t=11.5980, P= 0.0000 and t =4.2194, P =0.0004, respectively). Conclusions PI3K/Akt signaling pathway might effect the expression of BACE1, in which impaired signaling pathway may cause the amyloid precursor protein to be easily processed by BACE1, and thus involves the pathology of Alzheimer' s disease.

Objective To study the correlation of ~(18)F-fluorodeoxyglucose (FDG) PET/CT with pathological changes of the VX2 rabbit tumors after treatment of Ar-He knife,and to explore the evolution of the Ar-He knife curative effect for VX2 rabbit tumors.Methods Thirty-six Japanese white rabbits had successfully been implanted with VX2 tumors in thighs.Four weeks later,the rabbits with VX2 tumors were imaged with FDG PET/CT before they were treated with Ar-He cryoablation.The rabbits were evenly and randomly divided into 6 groups (6 rabbits in each group) and imaged with FDG PET/CT respectively on the first day,third day,seventh day,fourteenth day,thirtieth day and sixtieth day after cryoablation.The rabbits in each group were sacriftced after post-treatment FDG PET/CT imaging for pathology and immunohistochemistry studies.The standardized uptake value (SUV) of tumor regions were calculated and compared with pathology and immunohistochemistry findings in the cryoablative area in each group.Paired-samples t-test and bivariate correlation analysis were evaluated by statistical software SPSS 16.0.Results After ArHe cryoablation,pathological changes of "necrosis-inflammatory response→organization" were found.On CT imaging,the tumors enlarged during 3-14 d after treatment and then shrank gradually.On FDG PET imaging,the maximum SUV (SUV_(max)) dropped dramatically on the first day after the operation(from 2.54±1.12 to 0.67±0.12),and increased slightly on the third day (1.71±0.82),and then continually dropped to 0.51±0.32 (60 d afterthe operation).The differences of SUV_(max) between pre-and after cryoablationin each stage were significant,respectively (t=5.471,8.716,11.388,5.713,7.144 and 7.213,all P＜0.05).The size and SUV_(max) of the targeting area did not correlate with each other(r=0.259,P=0.675).The change of the MVD closely correlated with SUV_(max)(r=0.865,P=0.032).Conclusion FDG PET/CT can reveal the pathological change of tumor tissue after Ar-He cryoablation therapy and therefore may be a potential tool for evaluating the curative effect of this treatment modality.

Objective To investigate the experience of endoscopic mini-invasive therapy for residual lesions of peripancreatic necrotizing infection with choledocoscopy-assisted debridement technique, and to explore its clinical application value. Methods 71 patients with postoperative surgical drainage and accompanied with residual focus were collected. Choledochoscope was inserted via the drainage sinus, and the focus was observed and necrotic tissue was removed under direct choledochoscopic vision. Results Of the 71 patients who underwent this procedure, 64 were cured (success rate, 90.1%); 3 patients withdraw from treatment due to economic reasons; 4 patients received open surgery after 1 ～ 3 times of choledocoscopy-assisted debridement. The 64 cured patients received 2 ～ 9 times of choledocoscopy-assisted debridement with a mean of 5.1 times. 87.5% patients needed 4 ～ 6 times of procedures. The healing time was 18 ～ 125 days (average 71.3 days). Hemorrhage occurred in 3 patients and digestive tract fistula occurred in 2 patients and were resolved with non-operative management. Conclusions With the help of postoperative established surgical drainage channel, choledochoscopy-assisted debridement could be considered as a safe and effective miniinvasive treatment for residual focus of peripancreatic necrotizing infection, and is worth of clinical application.