BACKGROUND: With the rapid development of tissue engineering, a single biological scaffold material is hard to meet the needs of tissue engineering. Therefore, composite scaffolds with excellent performance will be obtained by combining two or more kinds of materials.OBJECTIVE: To detect the adherence and proliferation of dental pulp stem cells on the Chitosan-fibrin composite scaffold.METHODS: Dental pulp stem cells were isolated and extracted from C57 neonatal rats through modified enzyme-digestion method, and subcultured to the third generation, followed by adipogenic and osteogenic induction in vitro. Then, induced cells were identified. The chitosan-fibrinogen composite scaffold was prepared, and the pore size and porosity were determined. The chitosan-fibrin composite scaffold was co-cultured with passage 3 dental pulp stem cells to observe the cell proliferation by MTT assay, and the morphology of the composite scaffold, cell adhesion,proliferation and extracellular matrix secretion were observed under scanning electron microscope. In addition, the cells were inoculated directly on the bottom of culture plate as controls.RESULTS AND CONCLUSION: The dental pulp stem cells were successfully isolated and cultivated, and positive for osteogenic and adipogenic differentiation. The pore size and porosity of the composite scaffold was (105.32±22.10) μm and (87.714±1.276)%, respectively. The S-shaped proliferation curve in the experimental group was similar with that in the control group; the proliferation rate in the experimental group was significantly higher than that in the control group after 4-8 days of culture (P < 0.05). At the 2nd day after co-culture, the cells adhered tightly and grew well onto the composite scaffold; at the 4th day, enlarged cells began to proliferate obviously with abundant extracellular matrix; the surface and pores of the scaffold were full of cells at the 6th day. These results indicate that the chitosan-fibrin composite scaffold is suitable for the adhesion and proliferation of dental pulp stem cells.

Objective To quantitatively analyze the effects of high background radiation area (HBRA) on the frequencies of translocation and unstable chromosome aberrations in human peripheral blood lymphocytes.Methods Based on the data from 9 published articles retrieved from 7 electronic databases,the Meta-analysis was performed to evaluate the effects of high natural background radiation (HNBR) on the frequencies of chromosome aberrations in the peripheral blood lymphocytes in 17 777 persons from HBRA and 10 386 from the control area (CA).Cochrane's Q and I2 statistics were used to evaluate heterogeneity among studies and pooling odds ratio (OR) with 95％ confidence intervals (95％ CI) were calculated using random-effect models.Publication bias was also calculated by funnel plot,Egger linear regression test and Begg rank correlation test.Results The pooling OR of translocation [OR(95％ CI) =1.57(1.10-2.24)] and unstable chromosome aberration [OR(95％ CI) =2.04(1.32-3.14)] of long-term exposed inhabitants living in HBRA were higher than control.The subgroup analysis showed that,fortranslocation,the OR (95％ CI) were 1.24 (1.09-1.42,I2 =0.00) for male,1.37 (1.17-1.60,I2 =0.00) for female,1.17 (1.05-1.30,I2 =69.50％) for adults,and 1.38 (1.25-1.51,I2 =0.00) for Chinese.For unstable chromosome aberration,the OR (95％ CI) were 3.78 (2.40-5.97,I2 =0.00) for female,2.60 (2.25-3.00,I2 =69.60％) for adults,1.03(0.85-1.24,I2 =0.00) for children,3.19 (2.46-4.13,I2 =21.60％) for Iranian,and 1.64 (1.33-2.02,I2 =0.00) for Chinese.HBRA,age and sex differences were the reasons of above heterogeneity.Conclusions To the inhabitants living in HBRA,the frequencies of translocation and unstable chromosome aberration of peripheral blood lymphocytes are higher than those in control area.More comprehensive analysis should be performed to assess the health risk in HBRA inhabitants,which may arise new stragety in radiation protection.

Objective To investiagte the serum adiponectin concentration in preeclampsia and its relationship with serum leptin and soluble leptin receptor levels.Method The level of adiponectin,leptin and soluble leptin receptor in serum were measured by enzyme-linked immunosorbent assay(ELISA)in 38 patients with preeclampsia and 42 patients as control.The relationship of free leptin index(leptin/soluble leptin receptor) to preeclampsia was analyzed.Results There were no significant differences in maternal age,gestational age and body mass index(BMI)between two groups.But the gestational age and birth weight were significantly lower in preeclampsia than in control.The patients with preeclampsia had significantly higher levels of serum adiponectin, leptin and free leptin index(1691.7?g/ml,37.5 ng/ml and 0.95 respectively)than the control(689.4?g/ml, 19.3 ag/ml and 0.49,respectively).But there was no significant difference in serum level of soluble leptin receptor between the groups(35.0 ng/ml vs 42.2 ng/ml).Serum adiponectin was not significantly correlated with the level of leptin,soluble leptin receptor and free leptin index.Area of serum adiponectin,leptin and free leptin index in preeclampsia under the ROC curve were less than 0.5.Conclusions The patients with preeclampsia have paradoxical higher serum levels of adiponecfin and more bioavailability of leptin,suggesting these may be important factom of this complication.

Objective:To evaluate the effect of operation duration on the pharmacokinetics of desflurane in the patients undergoing tumor resection.Methods:One hundred and fifty patients of both sexes, aged 18-75 yr, with body mass index of 19-25 kg/m 2, of American Society of Anesthesiologists physical status Ⅰ or Ⅱ, in whom abnormal preoperative lung function was not found, undergoing elective surgery with general anesthesia from November 2019 to March 2020, were enrolled in this study.Anesthesia was induced with intravenous injection of sufentanil 0.3 μg/kg, cisatracurium besylate 0.2 mg/kg and propofol 2 mg/kg.The patients were tracheally intubated after mechanical ventilation.Anesthesia was maintained with inhalation of desflurane, the vaporizer dial was adjusted to 6% with fresh gas flow rate of 2 L/min, and sufentanil and cisatracurium besylate were intermittently injected intravenously according to the changes in hemodynamics and degree of muscle relaxation during operation.The duration required for the end-tidal concentration of desflurane reaching 0.5 minimum alveolar concentration (MAC), time when the ratio of the end-tidal concentration of desflurane to the pre-set concentration of the vaporizer reached 1/2, time when the ratio of the end-tidal concentration of desflurane to the inhaled concentration reached 1/2, time for the end-tidal concentration of desflurane to decrease to 0.5 MAC and time for the end-tidal concentration to decrease from 0.5 MAC to 0.2 MAC immediately after closing the volatile tank were recorded.The patients were divided into 3 groups according to the operation time: operation time <2 h group (group S), operation time 2-4 h group (group M), and operation time >4 h group (group L). Results:There were no significant differences among the 3 groups in the duration required for the end-tidal concentration of desflurane reaching 0.5 MAC, time when the ratio of the end-tidal concentration of desflurane to the pre-set concentration of the vaporizer reached 1/2, time when the ratio of the end-tidal concentration of desflurane to the inhaled concentration reached 1/2, time for the end-tidal concentration of desflurane to decrease to 0.5 MAC and time for the end-tidal concentration to decrease from 0.5 MAC to 0.2 MAC immediately after closing the vaporizer ( P>0.05). Conclusion:Operation duration does not affect the pharmacokinetics of desflurane in the patients undergoing tumor resection.

Abstract: Objective　To explore the relationship between body mass index (BMI), waist-hip ratio (WHR) and the risk of gout in Urumqi. Methods　A total of 516 male patients with gout in a third-class hospital in Urumqi from 2015 to 2019 were randomly selected as the gout group and 516 male healthy subjects in the same hospital as the control group. The relevant blood biochemical indexes were examined and analyzed. Blood pressure, waist circumference and hip circumference were measured. Body mass index and waist-to-hip ratio were calculated. Logistic regression model was used to analyze the relationship between overweight / obesity, waist-to-hip ratio and the risk of gout. The test level is α = 0.05. Results　Uric acid, glucose, urea nitrogen, creatinine, triglyceride, low-density lipoprotein, systolic blood pressure, weight and waist circumference in gout group were higher than those in control group, and the differences were statistically significant (P<0.05); There were no significant differences in age, height and diastolic blood pressure between the two groups (P<0.05). There was a positive correlation between BMI and WHR and the occurrence of gout (r=0.272, 0.345, P<0.05). There were significant differences in BMI, WHR and waist circumference between the gout group and the control group（χ2= 55.338, 54.928, 54.153, P<0.05）. After adjusting for age, aerobic exercise and other confounding factors, the results of multi-factor unconditional Logistic regression analysis showed that the odds ratio (OR) of gout in patients with BMI of 24.00-27.99 kg/m2 and ≥28.00 kg/m2 was 2.005 (1.337-3.006) and 2.677 (1.668-4.296) times higher than that of patients with normal BMI, respectively. The OR value of gout in patients with WHR≥0.90 was 1.668 times higher than that in patients with normal WHR, and the difference was statistically significant. The results of subgroup analysis according to age are generally similar. Conclusions　The BMI and WHR of man with gout in Urumqi are higher than those of normal people, and BMI, waist circumference and WHR are all associated with the incidence of gout. The risk of gout increases with the increase of BMI and WHR.

Objective: To investigate the effects of Chinese herbal drug-containing serum, prepared by administration of Chinese herbal medicine for activating blood (Xiongshao Capsule, XS) or for activating blood and detoxifying (Xiongshao Capsule plus Huanglian Capsule, XSHL) in rats, on cell viability, oxidative damage and apoptosis of human umbilical vein endothelial cells (HUVECs) induced by oxidized low-density lipoprotein (ox-LDL). Methods: Thirty-two rats were randomly divided into 4 groups: control group, positive control group (simvastatin 1.8 mg/kg), activating blood (XS, 0.135 g/kg) group, and activating blood and detoxifying (XS Capsule 0.135 g/kg and Huanglian Capsule 0.135 g/kg, XSHL) group. Corresponding drugs were continuously administered to the rats for 7 days and then drug-containing serum was harvested 1 hour after the last administration. HUVECs isolated from newborn children by collagenase digestion were stimulated by ox-LDL (100 μg/L) and incubated with corresponding drug-containing serum for 24 hours. Untreated HUVECs were also used as a normal control. The morphology and structure of HUVECs were observed by an inverted microscope. Cell viability was measured by methyl thiazolyl tetrazolium method, and cell membrane damage was determined by lactate dehydrogenase (LDH) leakage. Activity of superoxide dismutase (SOD) was examined by spectrophotometry, and content of malondialdehyde (MDA) in the cell lysate was examined by thiobarbituric acid assay. HUVECs were stained with Annexin V-fluorescein isothiocyanate and propidium iodide and analyzed on a flow cytometry to determine apoptosis. Results: Compared with the normal HUVECs, the cell viability and the activity of SOD were significantly decreased while the content of MDA and apoptosis rate were significantly increased after 24-hour ox-LDL stimulation (P<0.01, P<0.05). Simvastatin-, XS-, and XSHL-containing serum significantly promoted the ox-LDL-stimulated HUVEC viability and inhibited early apoptosis (P<0.01, P<0.05), while had no significant effect on LDH leakage. Simvastatin-containing serum and XS-containing serum also showed significant decrease in MDA content and increase in SOD activity, while XSHL-containing serum showed no significant effects. There was no significant difference between the XS-containing serum group and the XSHL-containing serum group. Conclusion: Both sera containing XSHL and XS show protective action against the oxidative damage and apoptosis of HUVECs induced by ox-LDL.

Objective To investigate the efficacy and prognostic risk factors of ALL-R-2003 protocol in the treatment of relapsed childhood relapsed acute lymphoblastic leukemia (ALL) in single center. Methods A retrospective study of clinical data of 51 children with relapsed ALL from January 2004 to December 2014 was performed by using SPSS version 19.0 statistical software for statistical analysis. Results The median age at initial diagnosis of 51 patients was 5.5 years (range, 0.8-13.4 years). The median time from initial diagnosis to relapse was 25 months (range, 3-68 months) and follow-up time was 39 months (range, 3-116 months). The relapse rate in the standard-risk, intermediate-risk and the high-risk groups were 27.5 % (14/51), 29.4 %(15/51) and 43.1 % (22/51), respectively. The probability of 3-year overall survival (pOS) after relapse was (18.8±5.9)%and the probability of event free survival (pEFS) was (16.2±5.8)%. The 3-year pOS in very early relapse, early relapse and late relapse were 0, (11.7 ±7.7) % and (51.7 ±14.8) %, respectively (P= 0.000). There was no statistical difference in survival rate of different immunophenotype groups and sites of relapse (P> 0.05). The 3-year pOS of group S1, S2, S3, S4 were (50.0±35.4) %, (39.9±1.3) %, (10.0±9.5) % and 0, respectively (P=0.000). The 3-year pOS of bcr-abl and MLL gene positive groups were (25.0±21.7) %and 0, respectively, with no statistically significance compared with the negtive group [(24.1±12.0)%] (P>0.05). The 3-year pOS rates of children with bone marrow transplantation and without transplantation were (40.0 ±15.5) %and (13.0 ±5.9) % respectively (P= 0.038). Conclusions The children who in high risk group at initial diagnose are easily to meet earlier relapse and poorer prognosis. The survival period after relapse of bcr-abl or MLL gene positive cases is very short. Bone marrow transplantation can improve survival rate. Risk group at initial diagnose, relapse time and transplantation are the main factors influencing prognosis, and the relapse time and transplantation are the independent prognostic factors for relapsed childhood ALL.

Objective:To observe the effects of different moxibustion times on proteins of transient receptor potential vanilloid 3 (TRPV3) ion channel protein and synovial cell apoptosis in rats with rheumatoid arthritis (RA), to provide a new basis for the anti-inflammatory mechanism of moxibustion. Methods:A total of 50 Sprague-Dawley (SD) rats were divided into a normal group, a model group, moxibustion groupⅠ, moxibustion groupⅡ and moxibustion groupⅢ by complete randomization, with 10 rats in each group. Rats in the normal group were bred routinely, and rats in the model group were also bred routinely after successful modeling. After successful modeling, rats in moxibustion groupⅠ,Ⅱ andⅢ accepted consecutive moxibustion at Zusanli (ST 36) and Shenshu (BL 23) for 15 d, once a day, respectively 5 min, 20 min and 30 min for each session. The degree of paw edema was observed and recorded. Immunohistochemical assay was used to detect the protein expression of TRPV3 ion channel in dorsal root ganglia and spinal cord dorsal horn. Terminal-deoxynucleoitidyl transferase-mediated nick end labeling (TUNEL) was used to detect apoptotic synovial cell number. Results: At the end of treatment, paw circumference of rats in moxibustion groupⅡ andⅢ were significantly reduced as compared with that in the model group (P<0.05). TRPV3 ion channel protein expression of dorsal root ganglia and spinal cord dorsal horn was higher in the model group than that in the normal group (P<0.05); the TRPV3 ion channel protein expressions of dorsal root ganglia and spinal cord dorsal horn in moxibustion groupⅡ andⅢ were higher than that in moxibustion groupⅠ (P<0.05); apoptotic synovial cell number in the model group was larger than that in the normal group (P<0.05), and apoptotic synovial cell numbers in moxibustion groupⅡ andⅢ were significantly higher than that in the model group (P<0.05). Conclusion:Moxibustion of appropriate time could induce TRPV3 expression, and promote synovial cell apoptosis.

Objective To investigate the role of hMSH2 in the pathogenesis of sporadic insulinomas and to determine whether the expression of hMSH2 could be used to differentiate benign sporadic insulinomas from malignant ones. Methods Fifty-five sporadic insulinomas (40 benign and 15 malignant tumors) resected from 50 patients were obtained. Expression of hMSH2 was detected by immunohistochemistry staining. DNA was obtained from micradissected tissue. Loss of heterozygnsity (LOH) of hMSH2 gene was detected by PCR-LOH. 6 microsatellite markers were selected on 3 chromosomes, and microsatellite instability (MSI) status of tumor tissue were detected by PCR. The findings were analyzed in relation to the clinicopathological characteristics. Results Down-regulation of hMSH2 expression was found in 13% of 55 sporadic insulinomas. LOH of the hMSH2 gene was not present in 55 insulinomas. High frequency MSI (MSI-H, MSI occurred in at least 2 out of 6 sites) was present in 36% (20/55) of all the insulinomas. Down-regulation of hMSH2 expression was found in 33% of the 15 malignant tumors, while it was 5% in benign tumors (P < 0. 05). Conclusions Down-regulation of mismatch repair gene hMSH2 may be correlated with the degree of tumor malignancy. The expression of hMSH2 could be used as a potential marker for distinguishing benign insulinoma from malignant ones.

The present work was to investigate the effects of vasonatrin peptide (VNP) on cardiomyocyte protein synthesis induced by moderate hypoxia. In cultured neonatal rat cardiomyocytes, MTT methods, total protein measurement and (3)H-leucine incorporation were used to calculate the cell number and measure the protein synthesis of cardiomyocytes. Furthermore, radioimmunoassay was undertaken to observe the effects of VNP on the intracellular levels of cAMP, cGMP and the concentration of endothelin (ET) in the culture medium. The results showed that both the cell number and protein synthesis decreased with severe hypoxia for 24 h. In contrast, under moderate hypoxia, cardiomyocyte hypertrophy developed; the protein synthesis as evidenced by total protein content and 3H-eucine incorporation increased significantly. VNP reduced cardiomyocyte protein synthesis induced by moderate hypoxia in a dose-dependent manner. Furthermore, VNP increased the intracellular level of cGMP and decreased the concentration of ET in the culture medium under moderate hypoxia, but had no effect on the level of cAMP. These results suggest that VNP inhibits moderate hypoxia-induced protein synthesis in cultured neonatal rat cardiac myocytes. This effect is mediated, at least in part, by an increase in intracellular cGMP, a reduction in synthesis, and/or a release in ET of cardiomyocytes.
Animals ; Animals, Newborn ; Atrial Natriuretic Factor ; pharmacology ; Cell Hypoxia ; Cells, Cultured ; Cyclic AMP ; metabolism ; Cyclic GMP ; metabolism ; Dose-Response Relationship, Drug ; Endothelins ; biosynthesis ; Myocytes, Cardiac ; metabolism ; Protein Biosynthesis ; Rats ; Rats, Sprague-Dawley