1.Seeding cells of tissue-engineered heart valve
Chinese Journal of Tissue Engineering Research 2007;0(29):-
Computer-based online research was performed in Pubmed Database from January 1995 to January 2008, China National Knowledge Infrastructure (CNKI) and Vip Database from January 2001 to January 2008. Forty-four publications referred to the seeding cell sources of tissue engineering heart valve demonstrated some disadvantages of clinically used mechanical prosthetic valve and biological valve. Tissue-engineered heart valve had advantages, such as no anticoagulant therapy, infection resistance, cellular viability and the potential to grow and to repair. Seeding cells have different sources, such as blood vessels, bone marrow, blood, umbilical cord, chorionic vesicle and embryonic stem cells, with particular regard to cell phenotypes and their suitability for extracellular matrix production for tissue engineering purposes. Despite an exciting potential for tissue-engineered heart valves, significant technical barriers and clinical problems must be solved and overcome. Further studies should be conducted before widespread clinical application can be envisioned, such as biodegradable polymers, stem cell differentiation, understanding how to harvest the potential of endogenous recruitment of cells and techniques to non-invasively assess the speed and quality of tissue healing and remodeling. This needs to engender a host of novel testing strategies and methods, which will include in vivo safety studies and preclinical studies.
2.Effect of Toll like receptor 4 and its endogenous ligands in ischemia-reperfusion injury
Xuefeng CHEN ; Guizhen HE ; Liangguang DONG
Basic & Clinical Medicine 2006;0(12):-
TLR4 mediates I/R injury involving endogenous ligands.Interaction of TLR4 with endogenous ligands provides a critical link between tissue damage and activation of the innate immune response.In the early phase of liver,kidney,heart,or lung I/R injury,endogenous ligands are secreted from several kinds of cells,they are recognized by TLR4.Interaction of TLR4 with endogenous ligands,such as HMGB1,seems to be the most important trigger of inflammation and initiates signaling cascades leading to inflammatory and immune responses.Blocking the interaction of TLR4 with endogenous ligands may be useful in clinical management of inflammation and cellular necrosis caused by ischemic insults.
3.Evaluation of endoscopic retrograde cholangiography prior to laparoscopic cholecystectomy
Xuefeng WANG ; Ping DONG ; Wenjie ZHANG
Chinese Journal of General Surgery 2000;0(12):-
ObjectiveTo assess the value of endoscopic retrograde cholangiography(ERC) before laparoscopic cholecystectomy(LC) for gallstone disease complicated by suspected cholelithiasis. MethodsIndications for ERC included history of jundice, pancreatitis,abnormal liver function, suspected or BUS proven cholelithiasis. ResultsA history of jaundice( P
4.Analysis of two cases of huge adrenal tumor
Shaoqiang XING ; Liming DONG ; Xuefeng ZHANG ; Changhai SUN
Basic & Clinical Medicine 2017;37(9):1313-1316
Objective To investigate the clinicopathological characteristics, diagnosis and treatment of huge adrenal tumor.Methods Retrospectively analysed the clinical data of the 2 patients with huge adrenal tumor more than 10 cm in diameter, who were admitted in our hospital from September 2013 to January 2015.Clinical manifestations, treatment and prognosis were evaluated.Results Two patients were both suspected of adrenocortical carcinomas.Case 1 was a 28-year-old female.Laparoscopic surgery was performed at first but was conversed to open palliative adrenalectomy due to tumor rupture and bleeding.The postoperative pathology was adrenocortical carcinoma.The patient died of gastrointestinal bleeding caused by tumor metastasis 10 months later.Case 2 was a 39-year-old female, who underwent laparoscopic adrenolectomy with tumor excision completely.The postoperative pathology showed neoplasm of malignant potential, and no tumor recurred in 15 months follow-up.ConclusionsOpen surgery should be the priority if the diameter of adrenal tumor is more than 10 cm and diagnosis as suspicious of malignancy.Huge adrenocortical carcinoma is related to poor therapeutic response,and multimodality therapy may improve the prognosis.
5.Microinflammenance in maintenance hemodialysis patients waiting for renal transplantation
Yuanda WANG ; Dong ZHANG ; Yong WANG ; Xuefeng SUN
Chinese Journal of Tissue Engineering Research 2007;0(05):-
According to recent studies,cardiovascular disease,infection and malnutrition are the most common complications of maintenance hemodialysis (MHD),which also the main causes of death. Further studies illustrate that dialysis patients with micro-inflammatory state,which relate to patient uremia and hemodialysis,further more,closely related to the existing micro-inflammatory response to the above complications. Accordingly,to explore the mechanism in MHD patients with micro-inflammatory response,and to search for the effective micro-inflammation treatment,in addition,to enhance the quality of life of patients with MHD and survival rate has become a hot spot in recent years.
6.Expression of tissue factor in venous bypass grafting of rats
Wei SU ; Xuefeng QIU ; Nianguo DONG ; Jiawei SHI
Chinese Journal of Tissue Engineering Research 2009;13(53):10439-10442
BACKGROUND: Previous studies demonstrated that smooth muscle injury or ischemia/reperfusion injury result in tissue factor (TF) increasing. However, few reports concern the expression and mechanism of TF in venous bypass grafting.OBJECTIVE: To examine changes in TF protein expression in response to venous bypass grafting.DESIGN, TIME AND SETTING: The animal observation experiment was performed at the Department of Cardiovascular Surgery, Affiliated Union Hospital of Tongji Medical College, Huazhong University of Science and Technology from May 2006 to May 2008.MATERIALS: A total of 30 Sprague-Dawley (SD) rats.METHODS: Rats were underwent interposition bypass grafting of the common carotid artery via the ipsilateral external jugular vein. Namely, the proximal end of external jugular vein was ligated at the joints of external jugular vein and internal jugular vein, and the distal end of external jugular vein was ligated before branches. The proximal and distal ends of common carotid artery were occluded by artery clamp, and a 5 mm artery was removed. The proximal end of artery was anastomosed with distal end of artery, and the frontal wall was sutured with posterior wall. After that, the proximal end of external jugular vein was cut down and coincided with the distal end of common carotid artery.MAIN OUTCOME MEASURES: The expression of TF and proliferating cell nuclear antigen (PCNA) was detected by immunohistochemistry. Meantime, TF activity in vessel protein extracts was determined with TF activity assay kit, and the thickness of intima, media were calculated by computer imaging analysis system. The contralateral external jugular veins were served as the control.RESULTS: The adventitia of all vessels showed abundant TF staining. In early vein grafts, TF staining was markedly increased in the intima and media. However, intimal and media TF staining was absent in the contralateral control jugular veins and late vein grafts. The number of PCNA positive cells was increased in the vein grafts at day 3 after grafting, obvious increased at day 7, and reached the peak at day 14. TF activity in whole-vessel protein extracts was similar in control veins and early and late vein grafts. The thickness of neointima of the vein graft increased significantly at days 7, 14, and 28, and the thickness of media increased significantly at days 14 and 28.CONCLUSION: The changes of TF expression at various time points may relate to hyperplasia of neointima.
7.The application of Bispectrai index in pediatric radio frequency catheter ablation
Rong WANG ; Enming QING ; Xuefeng DING ; Qiuxia LI ; Xiuhua DONG
Chinese Journal of General Practitioners 2009;8(3):187-188
The aim of the study is to evaluate the feasibility and safety of Bispectral index (BIS) monitoring in pediatric radio frequency catheter ablation. One hundred and six children aged 0. 6-12 years, scheduled for radio frequency catheter ablation, were randomly divided into two groups. In group A patients received BIS monitoring during the operation (n = 50), and the group B received modified Observer's Assessment of Alertness/Sedation (OAA/S) scaling (n = 56). The anesthesia was maintained with propofol target-controlled infusion. The intraoperative propefol target concentration was adjusted to maintain the BIS values between 55-65 in group A and OAA/S scale about 1 in group B respectively, The heart rate (HR), mean arterial pressure (MAP) and pulse oximetric saturation (SpO2) were measured before anesthetic induction, 1 min after induction, catheter puncturing and the end of operation respectively. The requirements of propofol, the times of supporting ventilation and recovery, the respiratory depression, nausea and vomiting postoperatively were also recorded. The intraoperative HR, MAP and SpO2 showed no differences between two groups, but the requirements of pmpofol, the times of supporting ventilation and recovery were less in group A than that of group B (P<0.05). All children didn't have nausea, vomiting and respiratory depression. The results suggest that in pediatric radio frequency catheter ablation, BIS monitoring has the advantages of timely adjustment of anesthetic depth, reducing anesthetic requirements, shortening the time of recovery, so as the perioperative safety can be improved.
8.Effect of ω-3 polyunsaturated fatty acids on intestinal ischemiareperfusion injury and lymphatic duct ligation
Guizhen HE ; Liangguang DONG ; Kaiguo ZHOU ; Xuefeng CHEN
Chinese Journal of Clinical Nutrition 2010;18(2):95-100
Objective To investigate the effect of intestinal lymphatic duct ligation and ω-3 polyun saturated fatty acids on intestinal and distant organ in intestinal ischemia-reperfusion injury. Methods Totally 40Sprague-Dawley (SD) male rats (SPF grade)after gastrostomy were equally randomized into sham group (Sham), enteral nutrition (EN) group, enteral nutrition and lymphatic duct ligation (EN + L) group, ω-3 polyunsaturated fatty acids (ω-3PUFA) group, and ω-3PUFA and lymphatic duct ligation (ω-3PUFA + L) group. After 7 days of nutritional intervention, rats were subjected to 60 minutes of intestinal ischemia, ischemia plus mesenteric lymph duct ligation, or sham procedures. After 3 days of continuous nutrition intervention using the original nutrient, lymph nodes, lung, intestine, liver, and blood specimens were harvested. Intestinal permeability and morphology, results of bacterial cultures, and serum cytokines were observed or detected. Result After 3 days of intestinal ischemia-reperfusion (I/R), the body weights of rats in EN group significantly decreased when com pared with the pre-I/R levels (P < 0.05), while the body weights of rats in EN + L group were significantly lower than those in ω-PUFA group and ω-PUFA + L group (P < 0. 05). After one day of intestinal ischemia-reperfusion (I/R), the L/M significantly increased in each group (P <0.05 or P <0. 01). After 3 days of intestinal ischemiareperfusion (I/R) , the L/M were significantly lower than the level one day after ischemia- reperfusion in EN + L group, ω-PUFA group, and ω-PUFA + L group (P < 0.05). The L/M in EN group and EN + L group were significantly higher than that in ω-PUFA + L group (P < 0. 05). The mucosa thickness and villus height of jejunum in ω-PUFA group and ω-PUFA + L group were significantly higher than those in Sham group, EN group, and EN + L group (P < 0. 01 or P < 0. 05). The mucosa thickness and villus height of ileum in ω-PUFA group and ω-PUFA +L group were also significantly higher than those in EN group (P < 0.05). In ω-PUFA + L group, the serum endotoxin level and tumor necrosis factor-α level were significantly lower than those in EN group (P < 0.05), interleukin (IL) -6 level was significantly lower than that in the ω-PUFA group (P < 0.05), and IL-1 β level was significantly lower than those in other groups (P < 0. 05). In EN group, the lung cell apoptosis index was significantly higher than those in other groups (P < 0.05)and the levels of inducible nitric oxide synthase (iNOS)and myeloperoxidase (MPO) were significantly higher than those in ω-PUFA + L group (P < 0. 05). The level of iNOS was also significantly higher in EN + L group than that in ω-PUFA + L group (P < 0.05). Conclusions Sixty minutes of intestinal ischemia can cause intestinal injury, intestinal barrier dysfunction, and increased permeability of intestine. After 72 h of reperfusion, the intestinal injury can be partially recovered and the permeability can be lower than the post-ischemia level; however, bacterial endotoxin translocation and lung apoptotic cells still exist. Intestinal lymphatic ligation can alleviate the lung damage, promote repair of intestinal mucosa, reduce endotoxin translocation, and attenuate the systemic inflammatory response. EN added with ω-3PUFA is remarkably superior to conventional EN.
9.Mutation of P927S in PRD1 gene mediates azole resistance in Candida glabrata
Cen JIANG ; Danfeng DONG ; Lihua ZHANG ; Xuefeng WANG ; Yibing PENG
Chinese Journal of Infectious Diseases 2014;32(6):325-329
Objective To investigate the role of PDR1 gene in azole-resistant Candida glabrata (C.glabrata).Methods Thirty-eight clinical isolates of C.glabrata were collected from five different hospitals.The minimal inhibitory concentrations (MIC) of azole antifungals including fluconazole,itraconazole and voriconazole against C.glabrata were determined by broth microdilution.Sequencing and amplification of PDR1 gene was achieved by real-time quantitative polymerase chain reaction (PCR).The mutation was cloned into an expression plasmid and then transferred into C.glabrata.The efflux of rhodamine 6G and drug sensitivity test were performed,and expressions of CDR1 and CDR2 were examined to verify function of mutation.Results Among these 38 isolates of C.glabrata,17 were resistant to at least one of azole antifungals.Moreover,mutations of PDR1 gene existed in every resistant isolates.Results of phenotyping test showed that in the isolate that expressed PDR1P927S,the expression of CDR1 and CDR2 were increased by 20.53 and 4.03 fold,respectively.And the fluorescence intensity of rhodamine 6G was decreased to 0.62 in efflux experiment.Conclusion P927S mutation of PDR1 gene could induce azole resistance of C.glabrata by increasing the expressions of CDR1 and CDR2,which results in drug resistance due to enhanced effect of efflux pump.
10.Mechanisms of fluconazole resistance in clinical and experimental induced isolates of Candida glabrata
Cen JIANG ; Danfeng DONG ; Beiqin YU ; Xuefeng WANG ; Yibing PENG
Chinese Journal of Microbiology and Immunology 2012;32(6):537-541
Objective To investigate the mechanisms of fluconazole resistance in clinical and experimental induced isolates of C.glabrata.Methods Efflux of rhodamine 6G was performed to evaluate the effects of efflux pumps.The expression levels of transporter genes CDR1,CDR2,SNQ2 and ERG11 were examined by real-time RT-PCR.Meanwhile,sequence of PDR1 was determined by PCR based DNA sequencing.Results Efflux pumps of all fluconazole-resistant isolates had stronger effects than that of susceptible isolates,consistently with significant upregulation of CDR1,but no obvious difference was found in CDR2 or SNQ2.Also,no notable change in the expression level of ERG11 between susceptible and resistant isolates.PDR1 mutations existed in both clinical and experimental induced isolates of C.glabrata,among which P927S,L543P and S947L haven't been reported previously.Conclusion Mutations of PDR1 were induced by fluconazole both in vivo andin vitro,which will result in overexpression of CDR1 and strengthen the effect of efflux pump.