Overexpression of chicken Klf2 promotes klf7 transcription and inhibits adipocyte differentiation / 生物工程学报

Overexpression of Krüppel like factor 2 (Klf2) or Klf7 inhibits adipocyte formation. However, it remains unclear whether Klf2 regulates klf7 expression in adipose tissue. In this study, oil red O staining and Western blotting were employed to study the effect of Klf2 overexpression on the differentiation of chicken preadipocytes. The results showed that Klf2 overexpression inhibited the differentiation of chicken preadipocytes induced by oleate and the expression of pparγ, while promoted klf7 expression in chicken preadipocytes. Spearman correlation analysis was used to study the correlation between the expression data of klf2 and klf7 in the adipose tissue of both human and chicken. The results showed that there was a significantly positive correlation between the expression of klf2 and klf7 in adipose tissues (r > 0.1). Luciferase reporter assay showed that overexpression of Klf2 significantly promoted the activity of chicken klf7 promoter (-241/-91, -521/-91, -1 845/-91, -2 286/-91, -1 215/-91; P < 0.05). In addition, the activity of klf7 promoter (-241/-91) reporter in chicken preadipocytes was significantly positively correlated with the amount of klf2 overexpression plasmid transfected (Tau=0.917 66, P=1.074×10-7). Moreover, Klf2 overexpression significantly promoted the mRNA expression of klf7 in chicken preadipocytes (P < 0.05). In conclusion, upregulation of klf7 expression might be one of the pathways that Klf2 inhibits chicken adipocyte differentiation, and the sequence from -241 bp to -91 bp upstream chicken klf7 translation start site might mediate the regulation of Klf2 on klf7 transcription.

N-acetylcysteine prevents contrast-induced nephropathy following percutaneous coronary intervention in elder patients with coronary heart disease complicated with moderate to severe renal dysfunction: a clinical efficacy study / 中华老年医学杂志

Objective:To investigate the preventive effects of intravenous N-acetylcysteine(NAC)administration on contrast-induced nephropathy(CIN)following coronary intervention in elder patients with coronary heart disease(CHD)complicated with moderate to severe renal dysfunction.Methods:In this retrospective study, 242 elderly patients with CHD and moderate to severe renal insufficiency hospitalized in the Department of Cardiology of the First Affiliated Hospital of Nanjing Medical University and undergone coronary angiography from January 2018 to February 2022 were included and divided into two groups: the treatment group(100 cases)receiving NAC plus a continuous intravenous drip of 0.9% sodium chloride solution before and after surgery and the control group(142 cases)treated with only a continuous intravenous drip of 0.9% sodium chloride solution.To ensure the comparability of important baseline data between the two groups, a 1∶1 propensity score matching analysis was used, and 70 patients in each group were finally included.Pre-and post-operative serum creatinine(Scr)and blood urea nitrogen(BUN)values were recorded, the endogenous creatinine clearance(Ccr)and estimated glomerular filtration rate(eGFR)were calculated, and the incidences of CIN and changes in renal function indicators were compared between the two groups.Results:After coronary intervention, the incidence of CIN in the treatment group was significantly lower than that in the control group(1/70 or 1.4% vs.8/70 or 11.4%, P=0.033). In the treatment group, Scr[(186.01±36.62)μmol/L vs.(195.84±36.39)μmol/L, t=4.957, P<0.001]and BUN[(13.97±2.89)mmol/L vs.(14.84±2.85)mmol/L, t=5.206, P<0.001]decreased, while Ccr[(31.84±6.54)ml/min vs.(30.08±5.65)ml/min, t=-5.076, P<0.001]and eGFR[(31.60±6.93)ml·min -1·1.73m -2vs.(29.82±5.92)ml·min -1·1.73m -2, t=-5.200, P<0.001]increased, compared with pre-operative levels.In the control group, Scr[(186.65±27.28)μmol/L vs.(182.53±22.08)μmol/L, t=-1.783, P=0.079]and BUN[(17.57±3.33)mmol/L vs.(17.13±3.35)mmol/L, t=-2.234, P=0.029]increased, but Ccr[(30.57±6.37)ml/min vs.(31.06±6.01)ml/min, t=1.435, P=0.156]and eGFR[(30.76±6.46)ml·min -1·1.73m -2vs.(31.26±6.02)ml·min -1·1.73m -2, t=1.436, P=0.156]decreased, compared with pre-operative levels, and there was no significant difference except BUN(all P>0.05). Conclusions:For elderly patients with coronary heart disease complicated with moderate to severe renal insufficiency, the use of NAC before and after coronary intervention can reduce the risk of CIN and help improve renal function.

Laparoscopic treatment of abdominal and retroperitoneal cystic masses in 11 children / 中华实用儿科临床杂志

Objective:To explore the feasibility and efficacy of laparoscopic resection of abdominal and retroperitoneal cystic masses in children.Methods:A retrospective analysis of 11 cases of abdominal and retroperitoneal cystic masses in Department of Pediatric Surgery, Quanzhou First Hospital Affiliated to Fujian Medical University from June 2015 to January 2019 was performed, and all the patients underwent laparoscopic resection or laparoscopic-assisted resection, with 6 cases of boys and 5 cases of girls, aged 8 months to 10 years (with the average of 59 months). Meanwhile, 9 cases were from the abdominal cavity and 2 cases were from the retroperitoneum.Results:All patients underwent laparoscopic or laparoscopic-assisted resection without switching to laparotomy.The operation time was 60-210 minutes, with the average of 120 minutes.The intraoperative blood loss was 5-30 mL, with the average of 10 mL.There was no blood transfusion.All patients were discharged 3-8 days after surgery, with the average of 5 days.The postoperative pathological results included 5 cases of mature teratoma, 1 case of paraneoplastic cyst, 2 cases of intestinal duplication, 2 cases of lymphangioma, and 1 case of hepatic cyst.Totally, 11 cases were followed up for 7-51 months, with the average of 20.9 months.No recurrence occurred.Conclusions:Laparoscopic or laparoscopic-assisted resection of abdominal and retroperitoneal cystic masses has advantages of minimal invasion, rapid recovery in children, and it is safe and effective.

Ultrasound diagnosis and grading of neonatal respiratory distress syndrome: a multicenter prospective study / 中国小儿急救医学

Objective:Lung ultrasound (LUS) has been used in the diagnosis of neonatal respiratory distress syndrome(RDS) successfully, but there have been no multicenter prospective studies to verify its reliability or determine how to grade RDS with LUS findings.This study aimed to discuss the necessity and feasibility of using LUS findings to determine RDS grades through a multicenter prospective study.Methods:Every researcher participated in the National Neonatal Lung Ultrasound Training Course and receiving 3-6 months of lung ultrasound system training at the National Neonatal Lung Ultrasound Training Center.Patients between June 2018 and May 2020 who met the RDS ultrasound diagnostic criteria and had full available clinical data were included in this study.The LUS examination was completed immediately after the patients were admitted to the hospital.Some of them also underwent chest X-ray examination.Arterial blood gas analysis was completed immediately before or after the LUS ultrasound examination.RDS grading was performed according to the LUS findings and whether the patient had serious complications.Results:A total of 275 qualifying cases were included in this study, which included 220 premature infants and 55 full-term infants, and the primary RDS occurred in 117 cases (42.5%), and secondary RDS occurred in 158 cases (57.5%). LUS manifestations of RDS patients can be divided into three categories: (1)A ground-glass opacity sign: which could be found among 50 infants when they were admitted to the hospital (that was, at their first LUS examination). Twenty-eight of these infants were considered to have wet lungs and were not sent for special management on admission, but LUS showed typical snowflake-like lung consolidation within 0.5 to 4 hours.Twenty-two of them were given mechanical ventilation with exogenous pulmonary surfactant; Eighteen cases were controlled within 6-12 hours, but the lung lesions became more severe in the other 4 infants (due to severe intrauterine infection). (2)Snowflake-like lung consolidations: the first LUS on admission showed typical snowflake-like lung consolidation involving areas ranging from 1-2 intercostal spaces to 12 lung divisions in 204 cases.Thirty-eight infants among them the lung consolidation only had involvement of 1-2 intercostal spaces at the time of admission; Fifteen of them received invasive respiratory support and recovered within 4-12 hours.Twelve patients received noninvasive respiratory support; Seven of them recovered, while five cases developed severe lung illness.The remaining 11 patients who were not given any form of ventilator support developed severe conditions within 1-4 hours.Thirty of them showed snowflake signs involving 12 lung regions at admission.The remaining 136 patients had lung consolidation degree between the two degree above condition.(3)Snowflake-like sign with complications: Twenty-one patients had severe complications such as pneumothorax, pulmonary hemorrhage or/and persistent pulmonary hypertension of the newborn or large area atelectasis, etc, although snowflake lung consolidation did not involve all lung regions.Conclusion:(1) LUS is reliable and accurate for diagnosing RDS.RDS has the same characteristics on ultrasound for both preterm and full-term infants, both primary and secondary RDS.(2) To facilitate the management of RDS, it is necessary to classify RDS according to the ultrasound findings and the presence of severe complications.(3) Based on the results of this study, it is recommended that RDS can be divided into mild, moderate and severe degrees.The exact standards for grading are as follows: Mild RDS: the early stage of RDS, in which lung consolidation shows as a ground-glass opacity sign on ultrasound; Moderate RDS: lung consolidation shows a snowflake sign on ultrasound, not all of the lung fields are involved; Severe RDS meets one or more of the following criteria: lung consolidation shows as a snowflake sign on ultrasound and all lung regions are involved, or regardless of its degree and extent, lung consolidation has caused serious complications, such as pulmonary hemorrhage, pneumothorax, persistent pulmonary hypertension of the newborn, or/and a large area of pulmonary atelectasis.

Retrospective analysis of 29 cases of neonatal atelectasis treated by ultrasound-assisted fiberoptic bronchoscopy and bronchoalveolar lavage / 中国小儿急救医学

Objective To evaluate the efficacy and safety of bronchoalveolar lavage( BAL) in the treatment of neonatal atelectasis with fiberoptic bronchoscopy under ultrasound monitoring. Methods From June 2018 to December 2018,29 children were diagnosed as atelectasis by lung ultrasound. After conventional mechanical vibration and sputum ineffective,BAL was treated with fiberoptic bronchoscopy. All patients be-fore operation were monitored by ultrasound to find the lung segment where the atelectasis was located. 0. 9%NaCl solution was injected by fibrobronchoscope(1～2 ml/kg),and then sucked to ensure the recovery rate of the lavage fluid was more than 50%. After each lavage,ultrasound was immediately used to monitor the recovery of atelectasis to determine whether or not to continue the lavage. One course of treatment could be continuously performed BAL 1 to 3 times a day,1 course per day,and up to 3 courses of lavage. We analyzed the efficacy,adverse reactions and complications of BAL in the treatment of neonatal atelectasis under ultra-sound monitoring. Results Twenty-nine patients underwent BAL treatment with fiberoptic bronchoscopy,25 cases (86. 2%) were cured,3 cases (10. 3%) were effective,and 1 case (3. 4%) was ineffective. All chil-dren had stable vital signs during treatment. Among them,11 cases (37. 9%) had transient hypoxemia, 3 ca-ses (10. 3%) had tracheal mucosal injury, and 2 cases (6. 9%) had hoarseness. There were no serious com-plications such as pulmonary hemorrhage,pneumothorax,and cardiac arrest. Conclusion BAL treatment of atelectasis under lung ultrasound monitoring has obvious effect,easy to operate,no radiation,no obvious ad-verse reactions and complications,which is worthy of clinical application.

Treatment of sebaceous gland hyperplasia with fractional Q-switched 1064 nm laser / 中华整形外科杂志

Objective@#To investigate the therapeutic effect of fractional Q-switched 1 064 nm laser in treatment of sebaceous gland hyperplasia.@*Methods@#36 patients with sebaceous gland hyperplasia were recruited and treated with fractional Q-switched 1 064 nm laser, once per 1-2 weeks, 6-8 times for a course, lesion clearance, post-treatment scaring and pigmentation were observed.@*Results@#Skin lesions gradually shrank or came off after one course of treatment with fractional Q-switched 1 064 nm laser, leaving mild difference of texture compared with the surrounding skin, no obvious scaring or pigment anomaly occurred, no recurrence was found during 6-month follow-up.@*Conclusions@#Fractional Q-switched 1 064 nm laser is effective for clearance of sebaceous gland hyperplasia, furthermore, it presents more pleasant cosmetic outcome could be obtained by a single technique.

Voice Acoustic Analysis in Parients Underwent Thyroidectomy / 听力学及言语疾病杂志

Objective To study the dynamic changes and potential impacts on the voice in postoperative pa-tients with different types of thyroid operation.Methods A total of 48 cases thyroidectomy,34 with thyroid isth-mus and lobectomy and 4 with total thyroidectomy,and 19 cases neck operation were included in this study for the examinations of electric laryngoscope,and acoustic voice analysis preoperative and postoperative,respectively.The characteristics of the acoustic parameters were analyzed.Results Vocal cord paralysis and cricothyroid joint disloca-tion in all the patients before and after operation were not observed.For male patients in the experimental group, postoperative parameter values of F0TD were higher than the day before surgery and 30 days after thyroidectomy. The difference was statistically significant (P 0.05).The parameter values of F0 in famale patients before the thyroidectomy,the 1st,2nd,3rd,7th day after the surgery and the parameter value of Jitter,Shimmer,HNR for 1st day after the operation were significantly dif-ferent(P 0. 05).Conclusion Voice parameter values alter in a way after thyroid surgery without apparent recurrent laryngeal nerve injury,especially in the female patients.The improvement of voice acoustic parameters can be observed on the 30th day after operation.

Phloroglucinol and Misoprostol for cervix pretreatment before diagnostic hysteroscopy:a meta-analysis of randomized controlled trials / 中国内镜杂志

Objective To determine the efficiency and safety of Phloroglucinol and Misoprostol for cervix pretreat-ment before diagnostic hysteroscopy. Methods Trials were located through electronic searches of the PubMed, MED-LINE, Springer, CNKI, VIP, CBM, WanFang Data (from the date of establishment of the databases to June 2015). Bibliographies of the retrieved articles were also checked. Result A total of 18 trials involving 2 341 patients were included. The Meta-analysis showed: application of Phloroglucinol lenovo better open and dilate the cervix [O? =2.95, 95 % CI (1.96, 4.45), = 0.000]; To better clarity of the operative field [ O? = 9.50, 95 % CI (6.46, 13.98), = 0.000]; To better shorten the operation time [O? =-4.12, 95 % CI (-5.75,-2.49), =0.000];To bet-ter able to reduce the amount of intraoperative leakage [ O? =0.22, 95%CI (0.10, 0.49), = 0.0002]; and postop-erative adverse reactions should be significantly lower than Misoprostol [ O? = 0.01, 95 % CI (0.00, 0.04), =0.000]. The difference was statistically significant. Conclusions Phloroglucinol is more effective and safer than Miso-prostol in inducing proper cervical priming and may be the optimal choice for cervical pretreatment before diagnostic hysteroscopy.

Stem cell tumorigenicity in Balb/c nude mice / 中国组织工程研究

BACKGROUND:Stem celltumorigenicity is a practical issue concerning stability in the clinical application of stem cells. Therefore, it is particularly important to clear whether stem cells have tumorigenic ability or not. Nude mice occupy an increasingly important position in oncology, immunology, and safety evaluation of drugs and biological products. OBJECTIVE:To observe the tumorigenicity of neural stem cells and mesenchymal stem cells in Balb/c nude immunodeficient mice. METHODS:Balb/c nude mice were randomly divided into control group, negative group, positive group, neural stem cellgroup and mesenchymal stem cellgroup. HepG-2 cells, RPE cells, passage 4 neural stem cells and mesenchymal stem cells were injected subcutaneously into nude mice from different groups, respectively. After 12 weeks of injection, anatomical observation was performed to detect the tumor formation in the transplantation site. Meanwhile, soft agar colony formation assay was applied to investigate neural stem celland mesenchymal stem cellclone in vitro. RESULTS AND CONCLUSION:After 12 weeks of injection, the tumorigenicity study results showed that no tumor developed in the transplantation site in the control group, negative group, neural stem cellgroup and mesenchymal stem cellgroup. Histopathologic examinations also showed no abnormality in these groups. Soft agar colony formation assay showed in soft agar resistance medium, neural stem cells and mesenchymal stem cells did not exhibit clone ability. These findings indicate that neural stem cells and mesenchymal stem cells undergoing short-term passages have no tumorigenic growth.

Primary study on two new types of composite materials for cartilage scaffold / 国际生物医学工程杂志

Objective To prepare two types of biodegradable modified materials (chitosan and collagen)and evaluate whether the new materials are suitable for tissue engineering cartilage.Methods Collagen and chitosan were both modified by poly-γ-benzyl-L-glutamate-co-glutamine acid (PBLG-co-PGA) with different proportions.The contact angle,degradation rate,tensile strength,cell attachment and cytocompatibility were tested and compared.Results As the PBLG-co-PGA content varied,the degradation rates of PBLG-co-PGA composites became adjustable,the hydrophilicity of PBLG-co-PGA/chitosan was improved,and the tensile strength increased in PBLG-co-PGA/collagen composite.The composites with 30％ PBLG-co-PGA were chosen for cytocompatibility and cell attachment experiments.The rabbit condrocytes grew significantly better on PBLG-co-PGA/chitosan than on other three materials(P＜0.05).Conclusion PBLG can improve the hydrophilicity,tensile strength and regulate the degradation rate of composite materials,and the cytocompatibility of the composites with 30％ of PBLG is good,among which PBLG-co-PGA/chitosan can even promote cell proliferation.It could be a new choice of scaffold for tissue engineering cartilage.

Evaluation of biocompatibility of modified gelatin composite membranes for corneal regeneration / 生物医学工程学杂志

In order to investigate the feasibility of the modified chitosan-gelatin crosslinked membrane (MC-Gel) and chitosan-gelatin crosslinked membrane (CS-Gel) to be a potential biomaterial for corneal regeneration, we evaluated their physicochemical properties and intraocular biocompatibility in this study. White light transmission and permeability of these membranes were detected. Results showed that white light transmission of both membranes was above 90% at 500 nm, which was similar to that of human cornea. The glucose, tryptophan and NaCl permeability of MC-Gel membrane and CS-Gel membrane was better than or similar to those of human cornea. The methylthiazol tetrazolium (MTT) assay was used to assess cell viability and proliferation. Also, interlamellar corneal transplantation was carried out to evaluate ophthalmic biocompatibility of MC-Gel membrane and CS-Gel membrane. Results indicated that MC-Gel membranes could support the proliferation of HCEC and displayed good intraocular biocompatibility when implanted into rabbits. No severe inflammatory reaction occurred after transplantation and the implanted MC-Gel membrane degraded completely 16 weeks post-operation. Due to its good physicochemical properties and biocompatibility, MC-Gel membrane could be a promising candidate material for corneal regeneration.

High ligation of varicocele improves sperm DNA integrity in patients with asthenospermia / 中南大学学报(医学版)

OBJECTIVE@#To assess how high ligation of varicocele improves sperm DNA integrity in patients with asthenospermia.@*METHODS@#The DNA fragmentation index (DFI) and semen analysis were conducted in 30 subjects with normal sperm samples, and the parameters were used as references. Fifty-six patients from the Department of Urology of the Second Affiliated Hospital of Chongqing Medical University from April 2009 to April 2011 all signed the informed consent. Semen was collected 1 week before the high ligation of varicocele and 3 months after the surgery. We compared the change of the integrity of sperm DNA and semen.@*RESULTS@#Three months after the high ligation of varicocele, DFI and semen indexes significantly improved (P0.05). Six months later, 27 spouses were pregnant out of the 53 surgical patients (50.9%). DFI of the pregnancy group and the non-pregnancy group was (13.90±9.70)% and (20.10±10.27)%, with significant different (P<0.05).@*CONCLUSION@#Varicocelectomy can improve the sperm DNA integrity in patients with asthenospermia, whose effect is not related to surgical approach, unilateral or bilateral varicocele or varicocele grade.

Application of tracing technique of labeling bone marrow mesenchymal stem cells with green fluorescent protein in tissue-engineered bone construction in vitro / 生物医学工程学杂志

This study was designed to label rat bone marrow mesenchymal stem cells (rBMSCs) with humanized renillar green fluorescent protein (hrGFP) for exploring the detectable effects of hrGFP on the construction of tissue-engineered bone in vitro. The hrGFP expression plasmid was packed into lentivirus by 293FT cells and transduced into rat BMSCs. After transduction, 81.3% rBMSCs successfully expressed green fluorescence. The hrGFP-rBMSCs were statically loaded on Bioglass-Collagen-Hyaluronic Acid-Phosphatidylserine (BG-COL-HYA-PS) scaffold in complete L-DMEM medium or osteogenic medium for 14 days. At 6h, a number of cells expressing green fluorescence can be observed by fluorescent microscopy. At day 7 and 14 after co-culture, the number of cells on the scaffold gradually increased. After 14 days for osteogenic induction, the hrGFP-rBMSCs and the interior of scaffold can be detected the expression of type I collagen. The results demonstrate that hrGFP labelling technique can detect visualizedly and effectively cell adhesion, proliferation and osteogenic differentiation in the construction of tissue-engineered bone in vitro.

Biocompatibility and experimental study on rabbits full-thickness articular cartilage defects repaired by a new biomimetic designing of a multi-grade compositions / 中华骨科杂志

Objective To observe the biocompatibility of a biomimetic designing of a multi-grade compositions in repairing articular cartilage and subchondral bone in animal bodies and repair the fullthickness defects in articular cartilage with the compositions and to study the regenerated cartilage histomorphologically. Methods Biocompatibility study: Acute general toxicity test, Haemolysis test, subcutaneous implantation test and chronic toxicity test. Articular cartilage defects repaired experimental study :The models of defects in articular cartilage were made artificially in both condylus lateralis femoris of mature rabbits. Implanted with the biomimetic designing of a multi grade compositions randomly at one side as the experimental group and the other side were untreated as the control group. The rabbits were killed at 4, 6, 8and 12 weeks after operation, respectively, with 6 ones at each time, and the macroscopic, histological, ultrastroctural examinations and semi-quantity cartilage scoring employing Wakitanifa repaired cartilage value system were performed. Results Biocompatibility study: (1) The rabbits' weight in experimental group kept growing .(2) Haemolysis rate of rats to different concentrations of diffusion solution was＜5%.(3) In chronic toxic reaction, rabbits' liver and kidney function was not different compared with the control groups at 12weeks and the index before operation. Articular cartilage defects repaired experimental study: 4-8 weeks after operation, the defects in the experimental group were partly filled with hyaline cartilage. Twelve weeks after operation, the defects in the experimental group were completely filled with mature hyaline cartilage.However, fibrous tissues were seen in the control group all the time. At 4, 6, 8, and 12 weeks postoperatively, the Wakitanifa cartilage scores were (7.60±0.98), (5.69±0.58), (4.46±0.85) and (4.35±0.12), respectively,in the experimental group and (10.25±1.05), (9.04±0.96), (8.96±0.88) and (8.88±0.68), respectively, in the control group. Differences between the control group and the experimental group were significant. Conclu sion The biomimetic designing of a multi-grade compositions has good biocompatibility and may induce cartilage regeneration to repair the full-hickness defects of articular cartilage.

On the preparation and mechanical properties of PVA hydrogel bionic cartilage/bone composite artificial articular implants / 生物医学工程学杂志

In view of the problems that conventional artificial cartilages have no bioactivity and are prone to peel off in repeated uses as a result of insufficient strength to bond with subchondral bone, we have designed and prepared a novel kind of PVA-BG composite hydrogel as bionic artificial articular cartilage/bone composite implants. The effects of processes and conditions of preparation on the mechanical properties of implant were explored. In addition, the relationships between compression strain rate, BG content, PVA hydrogels thickness and compressive tangent modulus were also explicated. We also analyzed the effects of cancellous bone aperture, BG and PVA content on the shear strength of bonding interface of artificial articular cartilage with cancellous bone. Meanwhile, the bonding interface of artificial articular cartilage and cancellous bone was characterized by scanning electron microscopy. It was revealed that the compressive modulus of composite implants was correspondingly increased with the adding of BG content and the augments of PVA hydrogel thickness. The compressive modulus and bonding interface were both related to the apertures of cancellous bone. The compressive modulus of composite implants was 1.6-2.23 MPa and the shear strength of bonding interface was 0.63-1.21 MPa. These results demonstrated that the connection between artificial articular cartilage and cancellous bone was adequately firm.

Degradable performance and bio-mineralization function of PLA-PEG-PLA/PLA tissue engineering scaffold in vitro and in vivo / 生物医学工程学杂志

The degradable performance and bio-mineralization function of PLA-PEG-PLA/PLA tissue engineering scaffolds in vitro and in vivo were systematically studied. The X-ray diffraction and Fourier transform infrared spectra showed that there was the deposition of bone-like carbonate hydroxyapatite on the surface of scaffolds. We found that the weight of scaffolds did not always decrease with the prolongation of time in vitro. At the same time, we found that after the PLA-PEG-PLA/PLA tissue engineering scaffolds were embedded in skulls of rhesus monkeys, the new bone area reached 75% at the 12th week. Histological observation showed that the new bones were rebuilt and knitted bones were formed at the 12th week. These findings meant that the PLA-PEG-PLA/PLA tissue engineering scaffolds were potential in clinical use.

The effect of Compound Xuanju Capsule and Prednisone on male infertility / 国际中医中药杂志

Objective To observe the curative effect of the combined action of Compound Xuanju Capsule and Prednisone on oligospermatism and antisperm antibody due to yang deficiency of kidney. Methods 136 patients were randomly divided into two groups: a treated group, which was taken Compound Xuanju Capsule and Prednisone, and a control group, which was taken Prednisone and Tamoxifen Citrate Tablet. Both groups received a 3-month therapy. The conditions of semen and antisperm antibody between the two groups were observed before and after the treatment. Results The total effective rate of the treated group was 90.94% (61 in 67 cases), and in which 11 cases were pregnant (16.41%). While the total effective rate of the control group was 63.07% (41 in 65 cases), and in which 2 cases were pregnant (3.08%).The clinical efficacy of the treated group was better than that of the control group. (P＜0.05) After the treatment, sperm density and motility of two groups were both evidently increased, (P＜0.05, P＜0.01) and the treated group increased much more obviously (P＜0.05). Conclusion The combined action of Compound Xuanju Capsule and Prednisone can improve the curative effect on the treatment for male infertility from oligospermatism and antisperm antibody due to yang deficiency of kidney.

Preparation of novel bioactive PCL bone tissue engineering scaffold / 生物医学工程学杂志

In the present study, porous PCL (poly (epsilon-caprolactone)) scaffolds were prepared through a melted extrusion manufacturing (MEM) machine, and carboxylate groups were formed on the surfaces of specimen by hydrolyzation with NaOH aqueous solutions. Apatite precursor was introduced on the surfaces of specimens with CaCl2 and K2 HPO4 under vacuum condition, and mineralization study was applied to these specimens. The results showed that the hydrophilicity of PCL surface was improved with the introduction of carboxylate groups, and the contact angle of surface was decreased to 26.52 degrees. A dense and uniform bone-like layer was confirmed to be formed on the surface of Ca-P treated specimens after mineralizing for less than 24 h in SBF by SEM and EDAX.

The preparation of bioglass/collagen/phosphoserine biomemetic composite scaffold and a study on its cytocompatibility / 生物医学工程学杂志

In the present study, novel biomemetic composite scaffolds using the sol-gel derived bioactive glass (BG), collagen (COL), and phosphoserine (PS) were prepared by freeze-drying. MC3T3-E1 were cultivated in vitro, collected and seeded onto the surface of BG, BG-COL and BG-COL-PS. Cell attachment and proliferation were observed. The cell proliferation was tracked by MTT method 1,3,5 d after seeding. MTT showed that the cells can adhere to and proliferate well on the surface of the scaffolds, and the cell proliferation result of scaffold BG-COL-PS was better than those of scaffolds BG and BG-COL. Therefore, the scaffold BG-COL-PS can be a potential scaffold for tissue engineer.

Biomechanical studies on gradient hydroxyapatite-coating / 中国矫形外科杂志

[Objective]To evaluate the interface biomechanical characteristics of a new kind of hydroxyapatite coating.[Method] Ten dogs underwent hermiarthroplasty of hip joint and were divided into 2 groups.One group was placed in Ti-6AI-4V femoral stem(Ti hip group),the second group was placed in HA-coated femoral stem(HA hip group).The second method was rod implant in condyles in both legs of each dog.Four matured dogs were selected.Eight Ti-6AI-4V rods(Ti rod group)were placed in lateral and medial condyle in left leg of each dog and eight HA-coated rods(HA rod group)were implanted in that of right leg of each dog.The dogs were sacrificed at 12 weeks after operation,and then the interface shear strength and imerface histological changes were evaluated.[Result]The Pust-out test showed that the average interface shear strengths of Ti hip group and HA hip group were(2.58?1.56)Mpa and(7.57?1.03)Mpa respectively.The interface shear strengths of HA hip group was significantly higher than that of Ti hip group(P