ObjectiveTo investigate the influence of Ataxia-telangiectasia mutated (ATM) activation on cellular oxidative stress induced by high glucose in bovine retinal capillary endothelial cells(BRECs). Methods The BRECs were treated by different culture medium with various glucose concentrations (5 mmol/L glucose, 30 mmol/L glucose, 30 mmol/L glucose+10 μmol/L KU55933) as normal glucose group, high glucose group and treatment group respectively.After the cells incubated for 48 hours, the protein expression of ATM, P-ATM, Mitogen-Activated Protein Kinase P38(P38), P-P38, Extracellular signal-regulated kinases(ERKs), P-ERKs was detected by Western blot; cellular ROS level was detected by Reactive Oxygen Species Assay Kit; propidium iodide/Hoechst staining was used for analysis of apoptosis; the expression of vascular endothelial growth factor (VEGF) in the supernatant was determined by Enzyme-Linked Immunosorbent Assay (ELISA); the paracellular permeability between endothelium cells was detected by FITC-dextran. ResultsCompared with the protein level of P-ATM, P-P38 and P-ERKs in high glucose group increased. Especially, P-P38, P-ERKs expressed much more than in high glucose group. The secretion of VEGF in high glucose group was higher than that in the normal glucose group but less than that in treatment group. The same tendency existed in ROS assay, apoptosis assay and paracellular permeability measuring. ConclusionsHigh glucose induced altered activation of ATM which might play a protective role in cellular oxidative stress. Deficiency of ATM might lead to ROS explosion, cell apoptosis and dysfunction of endothelial barrier. The mechanism might be associated with P38, ERKs and VEGF.
Objective To investigate the indication, approaches andpreventionof complications in treatment of female stress urinary incontinence(SUI) with tension-free vaginal tape (TVT). Methods From September 2003 to December 2004, 40 cases of female stress urinary incontinence were treated, including 8 cases in association with cystocele or rectocele and 1 case in association with uterine prolapse. They ranged from 30 to 70 years in age with an average of 56.3years. The disease course was 1.42 years(7.2 years on average). All patients received TVT. In the patients suffering from uterine prolapse and cystocele or rectocele, butterfly-shaped mesh patch was applied. Results All patients achieved satisfactory results.The complications included slight dysuria(2 cases),vesical perforation(1 case) and pelvic hematoma(1 case) and cleared up after treating. All cases were followed up 1 to 15 months and the results were satisfactory. No urinary incontinence and no dysuria reoccurred. Conclusion TVT is effective for SUI.
Objective To set up the experimemtal model with superior segmentalbone defect in acetabulum and implant the three-fin acetabular component, and examine the Von Mises stresses of pelvis bone with simulating single leg position in vitro using rosette strain gages method(RSGD). Methods Four kinds of three-fin components were made based on measurement of diameter, depth and roof thickness of acetabular specimens. These kinds of threefin acetabular components based on spreaded degrees of lateral fins(0,36,45 and 60°). The superiorsegmental bone defect of acetabulum in 4 cadaver pelvis specimens was made,then simulated the actual position to place implant into acetabular bone.A blank control group was set up.After being fit up the 7 sets of rosette strain gages,then specimen to test the pelvic Von Mises stresses simulating the static load of single leg on the mechanic machine.Progressive load was graded into 150, 300,450, 600, 750 and 900 N.We obtained the strains informations about loaded andun-loaded pelvis bone. Results Based on computed the strains informations,we were informed the Von Mises stresses about pelvis bone.The maximal Von Mises stresses of selected local position was 6.93 MPa and the minimal Von Mises stresses of selected local position was 1.08 MPa. Conclusion Providing the data about the mainpart of threefin acetabular component to optimize spreaded degrees of lateral fins.
Previous studies have shown that growth arrest, dedifferentiation, and loss of original function occur in cells after multiple generations of culture, which are attributed to the lack of stress stimulation. To investigate the effects of multi-modal biomimetic stress (MMBS) on the biological function of human bladder smooth muscle cells (HBSMCs), a MMBS culture system was established to simulate the stress environment suffered by the bladder, and HBSMCs were loaded with different biomimetic stress for 24 h. Then, cell growth, proliferation and functional differentiation were detected. The results showed that MMBS promoted the growth and proliferation of HBSMCs, and 80 cm H2O pressure with 4% stretch stress were the most effective in promoting the growth and proliferation of HBSMCs and the expression level of α-smooth muscle actin and smooth muscle protein 22-α. These results suggest that the MMBS culture system will be beneficial in regulating the growth and functional differentiation of HBSMCs in the construction of tissue engineered bladder.
Objective To investigate the relationship among rats′ stress ulcer and gastric acid, prostaglandin (PGs) and adrenocorticotropin (ACTH) and to probe the pathogenesis, prophylaxis and therapy. Methods Rats′ stress ulcer model was made by cold water soaking and was properly treated with drugs such as hyoscine, dexamethasone, ranitidine and losec. The amount and pH of gastric juice, change of gastric mucosa and PGs and ACTH of blood were determined. Results After rats were fasted for 24 hours a little gastric juice was aspirated. After cold water soaking of rats gastric juice was increased with the pH decreased, there was gastric mucosal bleeding, blood PGs was decreased and ACTH was increased. These suggest that on stress gastric mucosa bleeding is related with decreased gastric juice pH, decreased PGs and increase ACTH.Conclusion To control stress ulcer, pH of gastric juice and amount of PGs should be increased. Losec can increase gastric juice pH, so losec is the first choice to control stress ulcer.
【摘要】 目的 观察长期大量酒精摄入对大鼠心肌结构及心肌组织中丙二醛(MDA)、超氧化物歧化酶(SOD)和金属硫蛋白(MT)含量的影响,探讨氧化应激在酒精性心肌病大鼠中的作用。 方法 雄性健康SD大鼠45只,随机分为2组,即对照组20只和模型组25只。模型组酒精浓度从5%、10%、20%和30%依次各自由饮1周,然后递增至36%后以该浓度维持饲喂。对照组每日饮用与模型组酒精同等热量的葡萄糖水。6个月后,观察大鼠心肌组织的形态学改变及超微结构的变化,测定心肌组织中MDA、SOD及MT的含量。结果 模型组大鼠心肌细胞排列紊乱、间质充血、炎细胞浸润、线粒体肿胀、空泡形成、肌丝溶解、核膜不规则和核仁裂解。心肌组织中MDA含量明显升高(Plt;0.01),SOD活力含量明显降低(Plt;0.01),MT含量明显降低(Plt;0.01)。 结论 长期摄入大量酒精可使氧自由基代谢失衡,导致心肌损伤。氧化应激在酒精性心肌病发病机制中发挥着重要的作用。【Abstract】 Objective To observe the effect of longterm and large quantities of alcohol intake on myocardial structure of rats and the content of malondialdehyde (MDA), superoxide dismutase (SOD) and metallothionein (MT) in myocardium tissue. To study the effect of oxidative stress on the rats with alcoholic cardiomyopathy. Methods Fortyfive male and healthy SD rats were randomly divided into the control group (20 rats) and model group (25 rats).The alcoholic concentrate in model group was increased from 5%,10%,20% to 30% every week, and maintain free drinking mass concentration of 36% alcohol. The control group drink the same calories of glucose water. Six months later, the myocardial tissues were observed both in light microscope and electron microscope .The level of MDA、SOD and MT were tested in myocardium tissue. Results In the model rats, the cells of myocardial disarray, interstitial congestion, inflammatory cell infiltration, mitochondrial swelling, vacuole formation, melt filaments, irregular nuclear membrane and nucleolus cracking. The content of MDA incresed(Plt;0.01)and the activities of SOD decreased(Plt;001),levels of MT decreased (Plt;0.01) in the cardiac muscular tissues in the model group compared with the control group. Conclusion Longterm intake of large amounts of alcohol can break the balance of oxygen free radicals, which leading to the damage of myocardial. Oxidative stress plays an important role in the etiopathogenesis of alcoholic cardiomyopathy.
Objective To investigate the correlation between stress hyperglycemia ratio (SHR) and acute ischemic stroke (AIS) 1-year prognosis, to provide more clinical basis to improve the prognosis of AIS patients and to target and control the influencing factors. MethodsThe patients with AIS diagnosed for the first time and received treatment at the Shijiazhuang Fifth Hospital between May 2019 and January 2022 were retrospectively and continuously included. According to the Modified Rankin Scale score 1-year after the onset of the disease, the patients were divided into a good prognosis group and a poor prognosis group. Also the patients were divided into 2 groups based on the median of SHR. The correlation between SHR and stress blood glucose was analyzed, and the factors affecting the prognosis of AIS patients were identified. The predictive value of SHR and stress blood glucose on the prognosis of AIS patients was compared using receiver operating characteristic. Results A total of 206 patients were included. Among them, there were 125 cases (60.7%) in the good prognosis group and 81 cases (39.3%) in the poor prognosis group. The median SHR (lower quartile, upper quartile) is 1.20 (1.08, 1.33). There were statistically significant differences between the two groups in the scores of the National Institutes of Health Stroke Scale, diabetes history, hypertension history, low-density lipoprotein cholesterol, stress blood glucose, age, SHR and SHR classification (P<0.05). There was no statistically significant difference in the other indicators compared between the two groups (P＞0.05). Stress blood glucose was positively correlated with SHR (7.95±1.78 vs. 1.21±0.19; r=0.294, P<0.001). Multivariate logistic analysis showed that stress blood glucose and SHR were independent factors influencing the 1-year prognosis of AIS patients (P<0.05), and the interaction between SHR and diabetes was not significant (P>0.05) After adjusting for confounding factors, the area under the receiver operating characteristic curve of SHR for the prognosis of AIS patients was higher than that of stress blood glucose [0.682 (0.614, 0.745) vs .0.585 (0.515, 0.653); Z=2.042, P=0.041]. Conclusions SHR and stress blood glucose are independent risk factors for 1-year prognosis in AIS patients. However, SHR has a better predictive value for 1-year prognosis in AIS patients than stress blood glucose. Whether the patient has diabetes or not, the impact of SHR on the prognosis of AIS patients is consistent.
Objective To investigate the effects and possible mechanism of the local content changes of nitrogen monoxidum on bile reflux in rats’ pylori stress ulcer. Methods Fifty adult SD rats were restrained in planes and then were soaked in cold water to make stress ulcer. They were divided into three groups randomly: the stress group (30 cases), the L-NAME group (10 cases), whose pylori were injected with L-NAME solution and the normal saline group (10 cases), whose pylori were treated with saline solution. Besides, there were another 10 rats taken as the control group. The gastric ulcer index, pH value and bile acid concentration of gastric juice in each group were measured before and after stress. The local concentrations of nitrogen monoxidum in rats’ pylori were also measured by nitrogen monoxidum Biochemical Detection Kit. Results The local content of nitrogen monoxidum in rats’ pylori increased to maximum at 1 h after stress （P＜0.01）, while the bile acid and pH value of gastric juice went up to the maximum at 2 h after stress （P＜0.01）. The ulcer index reached the peak value at 4 h after stress （P＜0.01）. The bile acid concentration and ulcer index of the group injected with L-NAME solution in rats’ pylori decreased significantly compared with those of the group treated with normal saline solution (P＜0.01). The local concentration of nitrogen monoxidum also decreased significantly in the L-NAME group (P＜0.05）. However, there was no difference on pH values of gastric juice between those two groups (Pgt;0.05). Conclusion There is a positive correlation between the local concentration of nitrogen monoxidum in pylori and bile acid in the stomach in rats with stress ulcer. Injection of L-NAME solution in rats’ pylori may reduce the local content of nitrogen monoxidum so that the pyloric sphincter become less tense, which may lead to the significant decreases of ulcer index and bile acid in the stomach. Thus, L-NAME may protect gastric mucus effectively.
【Abstract】Objective To investigate the effects of tension-free herniorrhaphy on endocrine functions of patients with inguinal hernia. MethodsOne hundred and twenty-seven patients were randomly divided into tension-free group(n=65) and conventional group (n=62). The mean ages of tension-free group and conventional group were(51.8±14) year and(48.4±12) year respectively. There were 52 indirect hernias and 13 direct hernias in tension-free group. There were 51 indirect hernias and 11 direct hernias in conventional group. Bassini repair was used in conventional group. Peripheral blood samples were obtained preoperatively and 3 h, 24 h after operation for measuring the levels of cortisol, T3, TSH, insuline, Cpeptide and and glucose. The data were analysed through t test. ResultsThe levels of cortisol, C-peptide and glucose in conventional group were remarkably higher (P6”0.05) while the levels of T3,TSH were notably lower (P＜0.05) than those in tension-free group at 3 h, 24 h postoperatively, the level of insulin in conventional group was significantly higher than that in tension-free group at 24 h postoperatively. ConclusionThe results of this study indicate that tension-free repair imposes less influence on the endocrine functions of patients with inguinal hernia postoperatively than conventional repair does. This might explain pathophysiologically the quick recovery of the patients receiving tension-free herniorrhaphy.
Objective To evaluate the effectiveness and safety of tension-free vaginal tapes (TVT) compared with Burch colposuspension for female stress urinary incontinence (SUI). Methods We searched MEDLINE (1966 to October 2007), EMBASE (1988 to October 2007), Cochrane Central Register of Controlled Trials (1993 to October 2007), CMCC (1979 to October 2007) and CNKI (January 1979 to October 2007). We collected randomized controlled trials (RCTs) comparing TVT with Burch colposuspension in the treatment of SUI. Data were extracted and evaluated by two reviewers independently. The Cochrane Collaboration’s RevMan 4.2 was used for data analyses. Results Ten RCTs reporting data on effectiveness and safety of TVE versus Burch colposuspension were included. Meta-analyses showed that TVT was superior to Burch colposuspension as measured by the overall cure rate (OR 1.73; 95%CI 1.26 to 2.38; P=0.0007), negative stress test (OR 2.54; 95%CI 1.71 to 3.78; Plt;0.00001) and negative pad test (OR 1.67; 95%CI 1.16 to 2.41; P=0.006). The total complication rate was higher after TVT (OR 1.39; 95% CI 1.08 to 1.80; P=0.01), while the re-operation rate was significantly higher after Burch colposuspension (OR 0.29; 95%CI 0.10 to 0.80; P=0.02). The incidences of haematoma (OR 1.06; 95% CI 0.39 to 2.84; P=0.91), urinary tract infection (OR 1.27; 95% CI 0.64 to 2.52; P=0.50) and lower urinary tract symptoms (OR 1.20; 95% CI 0.89 to 1.62; P=0.23) were similar after TVT and Burch colposuspension. Conclusion The evidence for short-term superiority of TVT is currently limited. Although the re-operation rate is lower, the risk of bladder or vaginal injury is higher with TVT. Methodologically sound and adequately powered RCTs with long-term follow-up are needed.