At present, the research regarding repair of spinal cord mainly focuses on tissue engineering. Neural tissue engineering materials provide three-dimensional template for tissue regeneration and also environment for synthesis of extracellular matrix. This paper summarizes the types of nerve transplant materials and the research progress in application for treatment of spinal cord injury, so as to provide theoretical evidence for repair of spinal cord injury. But some problems exist in application of nerve cell scaffold materials for repair of spinal cord injury: poor mechanical properties lead to slow degradation speed, causing difficulties in tissue reconstruction with respect to velocity and in subsequent reconstruction of porous three-dimensional scaffold. In recent years, novel biomaterials with specific repair function have been made by the engineering method through combining the biological molecule with specific signal identification function and available materials, which is an advanced projeot in the current field of biomaterials.

Adult ; Agriculture ; Female ; Humans ; Lung ; physiology ; Male ; Middle Aged ; Plastics ; Respiratory Function Tests ; Surveys and Questionnaires

AIM: To analyze the effect of human amniotic homogenate extract on corneal neovascularization after corneal alkali burn in the process of pigment epithelium derived factor (PEDF) and vascular endothelial growth factor (VEGF) expression and the effect of corneal neovascularization.METHODS: Totally 32 patients with corneal alkali burn were selected from June 2015 to June 2016 in Foshan,and were randomly divided into Group A and Group B,with a total of 37 eyes.Group A of 17 cases,with a total of 19 eyes,were treated with 40mg/L human amniotic homogenate extract;Group B (n=15),and 18 eyes,treated with 3g/L prednisolone eye drops.In the treatment of 1,4,7,14,21 and 28d at different time points,we observed the growth of corneal neovascularization,and detected the expression of PEDF and VEGF during angiogenesis.RESULTS: Group A of patients in the use of human amniotic homogenate extract after the treatment,the expression level of PEDF was significantly higher than that in Group B(P=0.001),after 28d treatment,the expression level of PEDF reached 0.721±0.314.While patients in Group B the expression level of PEDF was only 0.538±0.253.Two groups had significant difference between the expression level of PEDF (P<0.05).The expression level of VEGF in Group A was lower than in Group B at different time points in the test.After the treatment of 28d patients in the Group A,the expression level of VEGF was 0.152±0.020,in Group B the expression level of VEGF was0.302±0.031.Two groups of patients with VEGF expression level between the differences were statistically significant (P<0.05).The patients number in Group A with corneal neovascularization was significantly lower than that in Group B,the difference was statistically significant (P<0.05).CONCLUSION: Human amniotic homogenate extract can increase the expression of PEDF in corneal neovascularization after corneal alkali burn,inhibit the expression of VEGF and the proliferation of corneal neovascularization.

0.05).3.Under light microscope, there was no change of the glomeruli detected in all of the LMWH-treated groups compared with the controls,while congestion and swel-ling in part glomeruli of group RSV were observed significantly. 4.Under electron microscope,glomerular structures of the LMWH-treated groups were almost normal compared with the control, while extensive foot process effacement was observed in group RSV under an electron microscope. 5.RSV RNA signal expressed weaker in the LMWH-treated groups than in group RSV.Conclusions Positive charged RSV destroys the glome-rular filtration barrier through its electrostatic interaction with the negative charged heparan sulfate(HS) of GBM. LMWH, as the analog of HS, charged with anion, competes with GBM HS to combine with RSV to keep the glomeruli from being infected and destroyed, and then reduce the proteinuria.

Objective T0 investigate the effects of transforming growth factorβ1 ( TGFβ1 ) and its receptorβ2 (TGFβR2) gene single nucleotide polymorphisms on the risk of intracranial hemorrhage in patients with brain arteriovenous malformation (BAVM).Methods Fifty-three BAVM patients of both sexes aged 18-64 yr who were genetically unrelated native HAN of Guangdong province were divided into 2 groups:patients with and without intracranial hemorrhage ( n =30:23).Venous blood samples were collected and anti-coagulated with ethylene diaminetetraacetic acid for genomic DNA extraction.TGFβ1-509C/T (rs1800469) and TGFβR2 875A/G (rs3087465) gene SNPs were genotyped by using PCR-RFLP.Results There were no significant differences in genotype and frequency between the 2 groups.The G carrier frequency of the TGFβR2 genotype was significantly higher in patients with intracranial hemorrhage than in patients without intracranial hemonrhage.The G carrier of the TGFβR2 genotype was associated with intrarcranial hemorrhage in patients with BAVM.Conclusion TGFβ1 gene polymorphism is not relevant to the intracranial hemorrhage in patients with BAVM,but polymorphisms of TGFβR2 could be a risk factor.

Objective To explore the changing rules of schistosomiasis infection and Oncomelania hupensis snail situation in areas where schistosomiasis transmission was controlled or interrupted or transmission rebounded after the interruption. Meth-ods Daye City,Wuxue City and Jingshan County were selected and investigated retrospectively to collect the schistosomiasis epidemiological information 10 years before they reached the criteria of transmission controlled and the subsequent years until 2008. The database of retrospective investigation was established for analyzing the trends and rules of the changes of snail status and human infection status. Results In Daye City,there was no snail areas and schistosomiasis patients and cattle after reach-ing the criteria of transmission interrupted in 1987. The infection rate of residents were positively correlative with the infection rate of cattle and snail areas(r=0.865,0.843,P<0.01). In Wuxue City,the proportion of snail areas occupying the historic snail areas kept a steady from the transmission controlled to transmission interrupted,but it began to rebound to the highest level in the history(8.93%)after the transmission interrupted for 3 years. In Jingshan County,the infection rates of residents and cat-tle were all stable from 1%to 2%after the transmission controlled. The proportion of snail areas occupying the historic snail ar-eas was rebounded from 1.63% in 1985 to 21.50% in 2008,and the densities of living snails rebounded from 2005. Conclu-sions The infected snails could be the sensitive indicator of the rebound of snail situation and human infection. The elimination of schistosomiasis still depends on the control of snail areas,including strengthening the infected snail control.

Objective:To investigate the relationship between serum vascular endothelial growth factor (VEGF), peripheral blood microRNA-126 (miR-126) and the number and distribution of cerebral microbleeds (CMBs).Methods:Consecutive patients with non-acute ischemic cerebrovascular disease admitted to the Department of Neurology, the First Affiliated Hospital of Baotou Medical College from June 2019 to June 2020 were enrolled. The clinical data were collected, 3.0 T MRI examination was performed, and susceptibility-weighted imaging was used to detect CMBs. The serum VEGF concentration was detected by enzyme-linked immunosorbent assay, and miR-126 was detected by fluorescence quantitative polymerase chain reaction. Multivariate logistic regression analysis was used to determine the independent influencing factors of CMBs. Multiple linear regression analysis was used to determine the correlation between serum VEGF concentration, miR-126 in peripheral blood and the number of CBMs. Receiver operating characteristic (ROC) curve was used to evaluate the predictive value of serum VEGF concentration and relative expression of miR-126 in peripheral blood for CMBs. Results:A total of 193 patients with non-acute ischemic cerebrovascular disease were enrolled, including 110 patients (57.0%) in the non-CMBs group, 20 (10.4%) in the strictly lobar CMBs group and 63 patients (32.6%) in non-strictly lobar CMBs group. The comparison among the three groups showed that age might be a risk factor for strictly lobar CMBs, while higher VEGF, higher cystatin C level, lower relative expression of miR-126 in peripheral blood, hypertension and previous stroke or transient ischemic attack might be the risk factors for non-strictly lobar CMBs. Multivariate logistic regression analysis showed that higher serum VEGF concentration was an independent risk factor for non-strictly lobar CMBs (odds ratio 1.186, 95% confidence interval 1.035-1.358; P=0.014), while the higher relative expression of miR-126 was an independent protective factor for non-strictly lobar CMBs (odds ratio 0.154, 95% confidence interval 0-0.269; P=0.026). Multiple linear regression analysis showed that higher serum VEGF concentration ( r=0.848, P<0.001) and the lower relative expression of miR-126 ( r=-0.043, P=0.035) significantly increased the number of CMBs. ROC curve analysis showed that the area under the curve of serum VEGF for predicting non-strictly lobar CMBs was 0.803 (95% confidence interval 0.741-0.865), the optimal cut-off value was 120.55 ng/L, the sensitivity was 70.7%, and the specificity was 75.5%. Conclusions:In patients with non-acute ischemic cerebrovascular disease, there is a significant correlation between serum VEGF concentration and the relative expression of miR-126 in peripheral blood and the number and distribution of CMBs. Serum VEGF can be used as a biomarker for predicting the presence of non-strictly lobar CMBs.

OBJECTIVETo further select the items based on the pre-test version of quality of life scale in patients with viral myocarditis.

METHODSTotally 100 patients with viral myocarditis were enrolled in this study. Methodologies including frequency distribution, discrete trend, t-test, Cronbach's α coefficient, correlation coefficient and factor analysis were applied to select items from different perspectives.

RESULTSA total of 17 items were selected by frequency distribution method from the perspective of central tendency, 15 items were selected by discrete trend method from the perspective of sensitivity, 16 items were selected by t-test method from the perspective of sensitivity and discrimination, 16 items were selected by Cronbach's α coefficient method from the perspective of internal consistency, 12 items were selected by correlation coefficient method from the perspective of representation and independence, and 18 items were selected by factor analysis method from the perspective of representation.

CONCLUSIONItem selection of quality of life scale in patients with viral myocarditis was successfully conducted based on the clinical epidemiological data using a variety of statistical methods.

Adolescent ; Adult ; Female ; Humans ; Male ; Myocarditis ; virology ; Quality of Life ; Surveys and Questionnaires ; Young Adult

Objective To construct the eukaryotic expression plasmid containing glyceraldehydes-3-phosphate dehydrogenase (GAPDH) and cysteine protease inhibitor ( CPI ) gene from periodic Brugia malayi (Bm) and to lay foundation for studying multivalent vaccines. Methods Total RNA was extracted from periodic Bin. The BmGAPDH and BmCPI genes were amplified by RT-PCR. The PCR product was cloned and then subeloned into eukaryotic recombinant plasmid vector pcDNA3.1 (+). pcDNA3.1 (+)/BmGAPDH/BmCPI was constructed. The recombinant plasmids were screened and identified by digestion with restriction enzyme and PCR amplification, and were transformed into HeLa cell subsequently. The transient expression of BmGAPDH and BmCPI were examined by RT-PCR. The expressed protein was identified by sodium dodeeylsulphate-polyacrylamide gel electrophoresis(SDS-PAGE). Results Two specific bands of around 877 bp of BmGAPDH and 621 bp of BmCPI were amplified, consistent with the expected value. The same bands were obtained by double restriction enzyme digestion of recombinant plasmids or PCR using recombinant plasmid as template. BmGAPDH and BmCPI mRNA were highly expressed in transfeeted HeLa cell. The relative molecular mass (Mr) of the recombinant protein was about 54 × 103. Conclusion The recombinant eukaryotic expression plasmid pcDNA3.1 (+)/BmGAPDH/BmCPI has been constructed successfully and the protein is expressed correctly in mammalian cell.

BACKGROUNDAdaptor proteins containing PH domain, PTB domain, and leucine zipper motif 1 and 2 (APPL1/2) play a key role in cell proliferation in many tissues. APPL1 or APPL2 as an adaptor for adiponectin receptors mediates the signaling pathway of adiponectin which acts as an anti-atherosclerotic adipokine. This study aimed to investigate whether genetic variations in the APPL1/2 genes affect the risk of coronary artery disease (CAD) in Chinese patients with type 2 diabetes mellitus (T2DM).

METHODSSeven haplotype-tagging single nucleotide polymorphisms (tag-SNPs) were selected from CHB HapMap database (Phase II) and total 203 CAD-positive cases and 106 CAD-negative controls with T2DM were genotyped for the 7 tag-SNPs by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) assay.

RESULTSThe minor allele G of rs4640525 at APPL1 locus was protective from CAD in patients with T2DM, with the carriers of genotype CC at higher risk of CAD compared with non-carriers (OR = 2.830, 95%CI 1.285 - 6.230, P = 0.010; OR' = 4.992, 95%CI = 1.758 - 14.173, P' = 0.003, after adjustment for the other known CAD risk factors); the homozygotes of AA at rs11112412 in APPL2 gene had higher risk of CAD compared with those of GG (adjusted OR' = 5.697, 95%CI 1.006 - 32.257, P' = 0.049).

CONCLUSIONGenetic variation(s) in APPL1/2 may be associated with CAD risk in T2DM in Chinese population.

Adaptor Proteins, Signal Transducing ; genetics ; Aged ; Asian Continental Ancestry Group ; Coronary Artery Disease ; genetics ; Diabetes Mellitus, Type 2 ; genetics ; Female ; Genotype ; Humans ; Male ; Middle Aged ; Polymorphism, Single Nucleotide