Relationship between pathomechanism of neuropathic pain-induced depression and autophagy in cortex of frontal lobe in rats / 中华麻醉学杂志

Objective To evaluate the relationship between the pathomechanism of neuropathic pain (NP)-inducced depression and autophagy in the cortex of the frontal lobe in rats.Methods Forty healthy male Sprague-Dawley rats in which IT catheters were successfully placed,aged 8-10 weeks,weighing 200-220 g,were divided into 4 groups (n =10 each) using a random number table method:sham operation group (group S),group NP,NP plus dimethyl sulfoxide group (group ND) and NP plus autophagy inducer rapamycin group (group NR).The neuropathic pain model was established by ligation of the left fifth spinal nerve of anesthetized rats in NP,ND and NR groups.Rapamycin 0.1 μgwas intrathecally injected via the intrathecal catheter immediately after ligation of the spinal nerve and every day after ligation once a day for 21 consecutive days in group NR.The equal volume of dimethyl sulfoxide was intrathecally injected instead of rapamycin in group ND.The mechanical paw withdrawal threshold (MWT) was measured before ligation and at 1,3,7,10,14 and 21 days after ligation.The forced swimming test was performed at 3 days before ligation and 14 and 21 days after ligation.The rats were sacrificed after the last measurement of the behaviour testing,and the prefrontal cortex was removed for determination of the expression of microtubule-associated protein light chain 3 Ⅰ (LC3 Ⅰ) and LC3 Ⅱ,Beclin-1 and p62 (by Western blot).The ratio of LC3 Ⅱ/LC3 Ⅰ was calculated.Results Compared with group S,the MWT was significantly decreased after ligation,the time of immobility was prolonged,the expression of LC3 Ⅰ was down-regulated,the expression of LC3 Ⅱ,Beclin-1 and p62 was up-regulated,and the LC3 Ⅱ/LC3 Ⅰ ratio was increased in NP and ND groups (P＜0.05).Compared with group NP,the MWT was significantly increased after ligation,the time of immobility was shortened,the expression of LC3 [and p62 was down-regulated,the expression of LC3 Ⅱ and Beclin-1 was up-regulated,and the LC3 Ⅱ/LC3 Ⅰ ratio was increased in group NR (P＜0.05).Conclusion Enhanced autophagy in the cortex of the frontal lobe is involved in the endogenous antidepressant mechanism in rats with NP.

Evaluation of the cellulase cost during the cassava cellulose ethanol fermentation process / 生物工程学报

Cellulose takes nearly 10% (W/W) dry weight of cassava tubers. In this study, the cellulase cost of different ethanol fermentation from cassava cellulose was evaluated. The processes include the direct saccharification and fermentation of original cassava cellulose residues, the direct saccharification and fermentation of pretreated cassava cellulose residues, and the simultaneous co-saccharification and fermentation of cassava starch and cassava cellulose. The results show that the cassava cellulose utilization in the first two processes were low with the enzyme cost of 13 602 and 11 659 RMB Yuan per tone of ethanol, respectively. In the third process, the final ethanol concentration increased from 101.5 g/L to 107.0 g/L when cassava cellulose and cassava starch were saccharified simultaneously. Comparing to the first two processes, the third one demonstrated the lowest enzyme cost at 3 589 RMB Yuan per ton of ethanol, which was less than the ethanol price and no additional equipment and operation cost input were added. The conclusion provided a practical way of cassava cellulose utilization in cassava ethanol industry.

Process strategy for ethanol production from lignocellulose feedstock under extremely low water usage and high solids loading conditions / 生物工程学报

The massive water and steam are consumed in the production of cellulose ethanol, which correspondingly results in the significant increase of energy cost, waster water discharge and production cost as well. In this study, the process strategy under extremely low water usage and high solids loading of corn stover was investigated experimentally and computationally. The novel pretreatment technology with zero waste water discharge was developed; in which a unique biodetoxification method using a kerosene fungus strain Amorphotheca resinae ZN1 to degrade the lignocellulose derived inhibitors was applied. With high solids loading of pretreated corn stover, high ethanol titer was achieved in the simultaneous saccharification and fermentation process, and the scale-up principles were studied. Furthermore, the flowsheet simulation of the whole process was carried out with the Aspen plus based physical database, and the integrated process developed was tested in the biorefinery mini-plant. Finally, the core technologies were applied in the cellulose ethanol demonstration plant, which paved a way for the establishment of an energy saving and environment friendly technology of lignocellulose biotransformation with industry application potential.

Teicoplanin Treatment of Severe Community-acquired pneumonia among Elderly:A Retrospective Analysis / 中华医院感染学杂志

OBJECTIVE To evaluate the rationality of teicoplanin for the empirical treatment of severe community-acquired pneumonia(CAP) in the aged.METHODS Totally 179 hospitalized cases of severe CAP were enrolled and divided into two groups,teicoplanin treatment group(67 cases) and non-teicoplanin treatment group(112 cases),whose clinical data and antibiotic empirical treatment were analyzed respectively,compared their PSI scores and clinical outcomes after 5 day′s therapy.RESULTS The PSI scores had no significant difference of two groups.The total treatment failure rate in teicoplanin treatment group was 23.9%,lower than that in non-teicoplanin treatment group.The treatment failure rate of teicoplanin combining the third generation cephalosporin treatment cases was 19.4%,lower than that in single use of cephalosporin(50.0%),also less than that in the cases of cephalosporin combining other antibiotics therapy,which accounted for 32.1%.CONCLUSIONS The use of teicoplanin may reduce treatment failure rate of severe CAP among aged.

Regulation of polygonati polysaccharide on expression of glycosylated end-product receptor mRNA in cardiac and renal tissues of diabetic mice / 中国组织工程研究

BACKGROUND: Siberian solomonseal rhizome is a sort of Chinese traditional medicine for anti-senilism. The effective component, poly gonati polysaccharide, has the effects of reducing blood glucose and glycosylhemoglobin.OBJECTIVE: To assay regulative effect of polygonati polysaccharide on expression of the key substance of non-enzymic glycosylation of proteinsglycosylated end-product receptor mRNA by reverse transcriptase polymerase chain reaction, so as to develop effective inhibitor for non-enzymic glycosylation of proteins and provide experimental evidences for preventing diabetes and its complications.DESIGN: Randomized control animal trial SETTING: Department of Geriatrics, the Second Xiangya Hospital, Central South University; Department of Cardiology, Haikou Hospital Affiliated to Xiangya Medical College, Central South University.MATERIALS: The experiment was completed in Animal Room of Second Xiangya Hospital of Central South University form March to June 2004. A total of 30 BALB/C mice of clean grade were selected and randomly divided into normal control group, model control group and polygonati polysaccharide group, with 10 in each group.METHODS: Diabetic models were established by intraperitoneal injection with streptozotocin to mice in model control group and polygonati polysaccharide group. Model establishment would be regard as successful if blood glucose of mouse was 8.0 mmoL/L or above. Mice in polygonati polysaccharide group were treated with polygonati polysaccharide (2 mL/kg per day), while mice in normal control group and model control group were treated with injection of 0.5 mL water once a day for 12 consecutive weeks.After medicine had been given to the mice, they were put to death by decapitation. Reverse transcriptase polymerase chain reaction was used to assay expression of glycosylated end-product receptor mRNA in cardiac and renal tissues of experimental animals.MAIN OUTCOME MEASURES: ① Observation of general situation of mice in each group 12 weeks later after model establishment. ② Change of blood glucose of mice in each group before and after model establishment.③ Gel electrophoretic maps of glycosylated end-product receptor mRNA in cardiac and renal tissue of mice in each group. ④ Semi-quantitative assay of glycosylated end-product receptor in cardiac and renal tissue of mice in each groupRESULTS: All the 30 mice entered the results analysis. ① Observation of general situation of mice in each group 12 weeks later after model establishment: mice in normal control group gained weight and moved freely; mice in model control group manifested the symptoms of losing weight, polyuria, listlessness, lags in response etc.; mice in polygonati polysaccharide group manifested milder symptom of polyuria and more sensitive in responses as compared with model control group.② Changes of blood glucose of mice in each group before and after model establishment: blood glucose levels were similar between normal control group and model control group before and after model establishment (P ＞ 0.05), while blood glucose in polygonati polysaccharide group significantly decreased 12 weeks later after model establishment [(10.05±1.16), (7.18±0.84) mmoL/L, P ＜ 0.05]. ③ Gel electrophoretic maps of glycosylated end-product receptor mRNA in cardiac and renal tissue of mice in each group: Compared with normal control group, the expression of glycosylated end-product receptor mRNA increased in cardiac and renal tissue of mice in model control group, while the expression in polygonati polysaccharide group significantly decreased as compared with model control group. ④ Semi-quantitative assay of glycosylated end-product receptor in cardiac and renal tissue of mice in each group: the relative value of glycosylated end-product receptor to β-actin in cardiac and renal tissue of mice in model control group was significantly higher than normal control group (P ＜ 0.01); however, the relative value of polygunati polysaccharide group significantly decreased as compared with model control group (0.760±0.121,0.998±0.202;0.609±0.146;0.765±0.113; P ＜ 0.05).CONCLUSION: Besides reducing blood glucose, polygonati polysaccharide can significantly down regulate high expression of glycosylated endproduct receptor mRNA in cardiac and renal tissue of mice with diabetes, so as to inhibit the combining sites for glycosylated end-products and a series of cytobiological reactions after combined with their receptors, and protect the target organs and tissues from injuring by hyperglycemia.

Experimental study on establishing eukaryotic expression vector pcDNA3.1(+)TPA and its expressing activity in human skin fibroblasts / 中南大学学报(医学版)

Objective To establish a cell line stably expressing the tissue plasminogen activator (TPA) in human skin fibroblasts so as to develop the function analysis and gene therapy of TPA in ischemic heart diseases. Methods Eukaryotic expression vector pcDNA3.1(+)TPA was constructed and transferred into human skin fibroblasts. After G418 selection, the exogenous expression and activity of TPA were observed subsequently by reverse transcription-polymerase chain reaction (RT-PCR), enzyme-linked immunosorbent assay (ELISA), and chromogenic substrate assay. Results Eukaryotic expression vector pcDNA3.1(+)TPA was expressed effectively in human skin fibroblasts. Quantitative ELISA showed that the expression of TPA protein of the experiment group was much higher than that of the hours). And the chromogenic substrate assay showed that the exogenous TPA activity of the experimental group was also much higher than that of the hours). Conclusion The exogenous TPA gene can be expressed effectively after pcDNA3.1(+)TPA was transferred into human skin fibroblasts, suggesting that the cell model will become an important tool in the further study of TPA function and gene therapy in ischemic heart diseases.

Olecranon osteotomy for treatment of intercondylar distal humeral fracture with double-plate fixation / 重庆医科大学学报

Objective:To evaluate the clinical effect of open reduction and internal fixation for the intercondylar distal humeral fracture with double-plate fixation.Method:A total of 26 cases with intercondylar distal humeral fracture were treated with the double-plate fixation via olecroanon approach.According to the AO/ASIF classification,there were 3 cases with C1,19 cases with C2 and 4 cases with C3.Cassebaum numerical rating system was employed to evaluated postoperative function of the involved elbow.Results:The post-operative function in 26 cases was evaluated according to the Cassebaum numerical rating system,follow-up averaged 15 months,and the results were:excellent in 19 cases(65.4%);good in 9 cases(23.1%);fair in 2 cases(7.7%);poor in 1 case(3.8%).The excellent rate was 88.5%.Conclusion:Double-plate fixation is characterized by stable fixation,minor complication and high satisfaction,and hence is an effective method for intercondylar distal humeral fracture.