BACKGROUND:Basic fibroblast growth factor (bFGF) plays an important role in the ligament tissue healing process, and bone marrow mesenchymal stem cel s transfected with growth factors can be used as seed cel s in ligament tissue engineering.
OBJECTIVE:To observe biological effect of bone marrow mesenchymal stem cel s transfected with recombinant adenovirus vectors carrying bFGF in three-dimensional co-culture with ligament fibroblasts.
METHODS:Passage 3 bone marrow mesenchymal stem cel s were divided into three groups:control group, Ad-EGFP group and Ad-bFGF group. Under a phase contrast microscope, the changes in cel morphology were observed and the rate of transfection was analyzed by flow cytometry. Proliferation of bone marrow mesenchymal stem cel s and ligament fibroblasts was analyzed by MTS, the expression of bFGF protein in bone marrow mesenchymal stem cel s was determined by ELISA. Scleraxis, col agen type I, col agen type III, decorin and cartilage oligomeric matrix protein levels were detected in BMSCs and ligament fibroblasts using real-time fluorescent quantitative PCR.
RESULTS AND CONCLUSION:Recombinant adenovirus-mediated bFGF gene could transfect bone marrow mesenchymal stem cel s efficiently. After co-culture for 3, 6 days, compared with the control group and Ad-EGFP group, in the Ad-bFGF group, the proliferation ability of bone marrow mesenchymal stem cel s and ligament fibroblasts was enhanced (P<0.01), the expression of bFGF protein in supernatant was obviously higher (P<0.01), the col agen type I, col agen type III, decorin and cartilage oligomeric matrix protein mRNA expression decreased in the ligament fibroblasts (P<0.01), but the mRNA expression of Scleraxis, col agen type I, col agen type III in bone marrow mesenchymal stem cel s increased (P<0.01). The results suggest that the co-culture of Ad-bFGF-transfected bone marrow mesenchymal stem cel s with ligament fibroblasts promotes the proliferation of ligament fibroblasts while decreases the col agen synthesis at the same time, and stimulates the proliferation and differentiation of bone marrow mesenchymal stem cel s into ligament fibrolasts.

In order to investigate the strength, structure and cell cytocompatibility of injectable thermosensitive chitosan (CS)/poly(vinyl alcohol) (PVA) composite hydrogel, chitosan hydrochloride solution was transferred to a neutral pH and mixed with different proportions of PVA, then the gelation time and strength of these different hydrogels were tested and spatial structures were observed under a scanning electron microscopy (SEM) after freeze-drying. The cytocompatibility of the hydrogels was evaluated through cytotoxicity test and three-dimensional culture with bone marrow mesenchymal stem cells. The results showed that the CS/PVA solution kept in liquid state at low temperature (0-4 degrees C) and turned into transparent elastomer about 15-20 min at 37 degrees C. Gelation time was prolonged, the strength increased and porous structure became dense with the PVA content increased in the mixed hydrogel. The cytotoxicity grades of these gels were from 0 to 1. Rabbit bone marrow mesenchymal stem cells could survive and proliferate in the gel within 3 weeks, and the gel had good cytocompatibility. It was concluded that thermosensitive CS/PVA composite hydrogel not only has interpenetrating network structure and better mechanical strength, but also has good cytocompatibility, and may be used as an injectable scaffold for tissue engineering.

Objective To observe the effects of PM2.5 exposure on A549 cells,and explore the mechanism of toxicity. Method The concentra?tions of PM2.5 exposure were determined utilizing cell viability assay. The morphological characteristics of exposed cell were observed with trans?mission electron microscope. Using big date from RNA?Seq and qRT?PCR,the mechanism was explored. Results The final concentration of PM2.5 exposure was 50μg/cm2;morphological detection showed that chromatin condensation after exposure which was also found on the boundary of nuclear membrane. KEGG pathway analysis and interaction network were finished ,and 8 kinds of apoptosis?related genes were found to be in?volved in the process of damage. Conclusion PM2.5 induces apoptosis in A549 cells by stimulating the changes of apoptosis?related genes ex?pressions.

Objective To investigate the composite of chitosan(CS) and polyvinyl alcohol (PVA) as scaffold carrier for rabbit chondrocytes nurture and growth.Methods The third passage of chondrocytes were seeded in CS/PVA gel scaffold and 24,48 and 72 h after which cytoactive and toxicity were determined by MTT respectively.After one,two and three weeks,the growing status and morphology of chondrocytes in CS/PVA gel were observed with scaning electron microscope (SEM) and laser confocal scanning fluorescence microscope (LCSM).Results The third passage of chondrocytes in CS/PVA gel scaffold remained high proliferation ability.MTT measuring cell activity and virulence,the result showed that the number of cells obviously increased with the time,with statistical significance of difference between each groups (P＜0.05),without side effect to cells by the material.Observation of scaning electron microscope and confocal laser scanning fluorescence microscope showed that chondrocytes grew well with the scaffold of CS/PVA gel.Conclusion CS/PVA mixed gel material can be used as scaffold for rabbit chondrocytes growing for repairing cartilages defect in tissue engineering.

AIM: To investigate the effects of polidatin on phospholipase A_2(PLA_2),nitric oxide(NO),and endothelin-1(ET-1) levels in serum and lung homogenate of hypoxic pulmonary hypertension rats.METHODS: 29 healthy Spraugue-Dawley rats were randomly divided into normal control group,chronic hypoxic group and hypoxic plus polidatin group.The model of chronic hypoxic pulmonary hypertension was made by method of intermittent isobaric hypoxia for 21 days.The mean pulmonary arterial pressure(mPAP) was measured by inserting a microcatheter into the pulmonary artery.The ratio of right ventricular wall and that of left ventricular wall and ventricular septum weight(R/L+S) was measured as well.RESULTS: After exposed to hypoxia for 21 days,the mPAP,R/L+S,PLA_2 and ET-1 activities in blood and lung homogenate increased significantly. The NO concentration decreased significantly.Pretreatment with PD attenuated these changes mentioned above.CONCLUSION: Pretreatment with PD effectively prevents the formation of chronic hypoxic pulmonary hypertension.Its mechanism may be related to the inhibition of PLA_2 and ET-1 and promotion of NO production.

Objective: To analyze the disease burden of acute gastrointestinal illness (AGI) caused by non-typhoidal Salmonella and Vibrio Parahaemolyticus in Zhejiang Province, so as to provide the reference for the prevention and control of foodborne diseases. Methods: The detection rates of non-typhoidal Salmonella and Vibrio parahaemolyticus in 2022 were collected through the Zhejiang Foodborne Disease Outbreak Surveillance System. The number of cases, incidence and hospitalizations of AGI caused by non-typhoidal Salmonella and Vibrio parahaemolyticus were calculated. Disability-adjusted life years (DALY) were used to analyze the disease burden of AGI caused by non-typhoidal Salmonella and Vibrio parahaemolyticus among different age groups. Results: The number of AGI cases caused by non-typhoidal Salmonella in Zhejiang Province in 2022 was 889 500 person-times, the incidence rate was 1 352.42/105, the number of hospital visits was 328 900 person-times, the DALY was 972.69 (95%CI: 771.68-1 164.16) person-years, and the DALY rate was 1.48 (95%CI: 1.17-1.77) /105. The incidence rate and DALY rate were highest in the children aged under 5 years, reaching 3 989.51/105 and 13.93 (95%CI: 8.67-18.42) /105, respectively. The number of AGI cases caused by Vibrio parahaemolyticus in Zhejiang Province was 639 400 person-times, the incidence rate of 972.16/105,the number of hospital visits was 166 800 person-times, the DALY was 509.30 (95%CI: 411.75-699.62) person-years, and the DALY rate was 0.78 (95%CI: 0.63-1.06)/105. The incidence rate and DALY rate were highest in the residents aged 45 to <65 years, reaching 1 383.55/105 and 1.27 (95%CI: 1.14-1.96)/105, respectively. Conclusions The incidence and DALY of AGI caused by non-typhoidal Salmonella were relatively high in Zhejiang Province. The AGI caused by non-typhoidal Salmonella in the children under 5 years and the AGI caused by Vibrio parahaemolyticus in the residents aged 45 to <65 years need to be monitored with priority.

OBJECTIVETo evaluate the safety and effectiveness of GreenLight 120-W laser photoselective vaporization of the prostate (PVP) versus transurethral resection of the prostate (TURP) for benign prostatic hyperplasia (BPH).

METHODSWe searched PubMed, Medline, Embase, Cochrane Library, Wanfang, CNKI, and VIP for randomized control trials and their references addressing 120-W PVP versus TURP in the treatment of BPH. Based on the inclusion and exclusion criteria, two reviewers independently accomplished the screening, quality assessment, and data extraction of the identified studies and performed meta-analyses using RevMan 5.2.

RESULTSTotally, 6 randomized control trials were included in this analysis, involving 703 cases, 351 treated by PVP and 352 by TURP. Compared with TURP, PVP showed significantly decreased time of catheterization (by 32. 55 hours, 95% CI 15.3 -49.8, P < 0.01), hospital stay (by 1.85 days, 95% CI 1.2-2.5, P < 0.01), and intraoperative blood loss (by 15.6 g/L, 95% CI 10.0-21.2, P < 0.01), but increased time of operation (by 9.37 minutes, 95% CI 5. 1-13.6, P < 0.01). There was also a significant reduction in blood transfusion, TUR syndrome, and capsular perforation in the PVP group. At 12 months after surgery, no statistically significant differences were found between the two groups in the improvement of maximum urinary flow rate, IPSS, postvoid residual, and sexual function.

CONCLUSIONGreenLight 120-W laser PVP is a safe and effective procedure for the treatment of BPH, with similar effectiveness to TURP but less blood loss, shorter time of catheterization and hospital stay, and lower incidences of blood transfusion, TUR syndrome and capsular perforation.

Blood Loss, Surgical ; Humans ; Laser Therapy ; adverse effects ; methods ; Length of Stay ; Male ; Prostate ; surgery ; Prostatic Hyperplasia ; surgery ; Randomized Controlled Trials as Topic ; Treatment Outcome

OBJECTIVEIntravenous administration of basic fibroblast growth factor (bFGF) is effective to reduce the volume of cerebral infract due to ischemia. This study was designed to investigate the molecular mechanism, especially the signal transduction pathways, involved in this protective role of bFGF.

METHODSAnoxia-reoxygenation treated astrocytes were used to study the role of mitogen-activated protein kinase/extracellular signal-regulated kinase kinase (MAPK/ERK kinase, MEK)-ERK signaling pathway after exogenous bFGF administration by Western blot. Electrophoretic mobile shift assay was used to detect the binding activity of early growth response factor-1 (Egr-1), an important transcription factor for endogenous bFGF.

RESULTSbFGF could protect some signal transduction proteins from the oxygen-derived free radicals induced degradation. ERK1/2 was activated and involved in Egr-1 binding activity enhancement induced by exogenous bFGF.

CONCLUSIONMEK-ERK MAPK cascade may be an important signal transduction pathway contributed to bFGF induced enhancement of Egr-1 binding activity in anoxia-reoxygenation injured astrocytes.

Animals ; Animals, Newborn ; Astrocytes ; drug effects ; metabolism ; Cells, Cultured ; Early Growth Response Protein 1 ; metabolism ; Electrophoretic Mobility Shift Assay ; methods ; Fibroblast Growth Factors ; pharmacology ; Mitogen-Activated Protein Kinase Kinases ; metabolism ; Oxygen ; metabolism ; Protein Binding ; drug effects ; Rats ; Signal Transduction ; physiology ; Time Factors

In order to investigate the strength,structure and cell cytocompatibility of injectable thermosensitive chitosan(CS)/poly(vinyl alcohol)(PVA)composite hydrogel,chitosan hydrochloride solution was transferred to a neutral pH and mixed with different proportions of PVA,then the gelation time and strength of these different hydrogels were tested and spatial structures were observed under a scanning electron microscopy(SEM)after freeze-drying.The cytocompatibility of the hydrogels was evaluated through cytotoxicity test and three-dimensional culture with bone marrow mesenchymal stem cells.The results showed that the CS/PVA solution kept in liquid state at low temperature(0-4℃)and turned into transparent elastomer about 15-20 min at 37℃.Gelation time was prolonged,the strength increased and porous structure became dense with the PVA content increased in the mixed hydrogel.The cytotoxicity grades of these gels were from 0 to 1.Rabbit bone marrow mesenchymal stem cells could survive and proliferate in the gel within 3 weeks,and the gel had good cytocompatibility,it was concluded that thermosensitive CS/PVA composite hydrogel not only has interpenetrating network structure and better mechanical strength,but also has good cytocompatibility,and may be used as an injectable scaffold for tissue engineering.

OBJECTIVETo compare clinical results of treating Neer two- and three-part of proximal humeral fractures between anterolateral acromial approach and deltopectoral approach.

METHODSFrom January 2009 to December 2012, 49 patients with Neer two- and three-part of proximal humeral fractures were treated with locked plate fixation. In anterolateral acromial approach group, there were 22 patients including 9 males and 13 females with an average of (63.2±7.6) years old, while 27 patients in deltopectoral approach including 12 males and 15 females with an average of (62.9±7.0) years old. Operative time, blood loss during operation, fracture healing time and complications were observed and compared, postoperative Constant-Murley scoring and VAS scoring were applied for evaluate function of shoulder joint and pain at 3 months, 1 and 2 years respectively.

RESULTSAll patients were followed up from 24 to 41 months with an average of 34.5 months. Operative time, blood loss, fracture healing time in anterolateral acromial approach group was (68.20±7.04) min, (151.30±20.57) ml, (10.88±4.90) weeks respectively, and better than that of in deltopectoral approach group which was (75.81±13.70) min, (242.10±37.25) ml and (13.60±2.45) weeks. Three months after operation, Constant-Murley scoring and VAS score in anterolateral acromial approach group was 88.32±5.45, 0.41±0.63 and better that of in deltopectoral approach group which was 63.53±8.31, 1.65±1.02. There was no significant differences between two groups in Constant-Murley scoring and VAS score at 1 and 2 years after operation. Each group has one case occurred loss of length humerus head height, and there was 1 case with subacromial impingement, 1 case with bolt loose and 2 cases with delayed union in deltopectoral approach. No axillary nerve injury, humeral head necrosis and breakage of internal fixation occurred both of two groups.

CONCLUSIONBoth of anterolateral acromial approach and deltopectoral approach are effective in treating Neer two- and three-part of proximal humeral fractures, and can obtain excellent outcomes. Moreover, anterolateral acromial approach has advantage of less trauma, less blood loss, shorter operative time, rapid recovery of shoulder joint function and fracture.

Aged ; Case-Control Studies ; Female ; Fracture Fixation, Internal ; methods ; Fracture Healing ; Humans ; Male ; Middle Aged ; Recovery of Function ; Shoulder Fractures ; physiopathology ; surgery