Objective To observe enhancing effect of nerve regeneration on peripheral nerve defect models bridged by VPA/PRGD conduit combined with adipose derived mesenchymal stem cells (ADSCs).Methods From February,2013 to August,2014,the hollow nerve scaffolds were constructed by PRGD and VPA.The activity of AD SCs proliferation was tested through the method of CCK-8.Moreover,the effect of VPA/PRGD conduit combined with ADSCs on peripheral nerve regeneration was evaluated,as well as recovery of motor function following sciatic nerve resection in rats.A 10 mm sciatic nerve deficit was created in a rat model and bridged by VPA/PRGD conduit combined with ADSCs (group A),VPAfPRGD conduit (group B) and autograft (group C) respectively.The results was analyzed by the method of group t-test of SPSS 19.0.Results At 3 d,6 d,9 d,CCK-8 test showed that the OD value of groups VPA/PRGD and control has no significance(P ＞ 0.05).At 12 weeks after surgery,the numbers of regenerated nerve proximal to the tube of group A (268±7.48),group B (269±6.86) and group C (271±7.55),had no significant difference between two groups(P ＞ 0.05).The numbers of regenerated nerve in the tube of group A (257±6.19) and group C (260±5.60) were significantly higher than those of group B (229±5.08) (P ＜ 0.05).There was no significant between groups A and C (P ＞ 0.05).The numbers of regenerated nerve distal to the tube of group A (246±5.89) and group C (247±5.02) were significantly higher than those of group B (214±7.55) (P ＜ 0.05).There was no significant between groups A and C (P ＞ 0.05).Conclusion These promising results illustrate that this novel VPA/PRGD combined with ADSCs conduit can obviously facilitate the regeneration of injured nerve in rats.

AIMTo explore the change of number working memory ability in healthy young adults, a continuous 3-back number working memory task were performed for an hour and 12 Blocks according to different COMT genotypes of young adults.

METHODS18 different genotype subjects were chosen from 112 healthy young adults, P3 event-related potentials was utilized to observe the relationship between this COMT polymorphism and cortical physiology in a continuous working memory task.

RESULTSSubjects bearing the Val/Val homozygote had significantly higher mean P3 amplitudes than Val/Met heterozygote (P < 0.01), however, no significant differences in comparison to Met/Met homozygote.

CONCLUSIONVal/Met Heterozygote subjects are associated with the poorest performance of working memory. There is a relationship between COMT genotype and P3 visual event-related potentials evoked from 3-back task.

Adult ; Brain ; enzymology ; physiology ; Catechol O-Methyltransferase ; genetics ; Event-Related Potentials, P300 ; genetics ; Evoked Potentials, Visual ; genetics ; Genotype ; Humans ; Male ; Memory, Short-Term ; physiology ; Polymorphism, Genetic ; Young Adult

Objective To design an ultra-fast thermal cycle fluorescent quantitative PCR system for on-site detection of pathogenic nucleic acids and evaluate its performances.Methods An ultra-fast thermal cycle fluorescent quantitative PCR system was developed with the components of a flat reaction cup,an ultra-fast thermal cycle module,a fluorescence detection module with fixed optical path and a data processing module based on the smartphone platform.The ultra-fast thermal cycle module was composed of a heating unit and a cooling unit,of which the heating unit was made of ceramic sheet and Ag/Pb alloy and the cooling unit consisted of a high-speed magnetic levitation cooling fan and a double-curved throat;the fluorescence detection module with fixed optical path was prepared with injection molding process,and made up of a light source excitation unit and a light detector unit;the data processing module based on the smartphone platform included a Bluetooth serial port adapter unit and a smartphone App,which used C2540F256 chip from TI company for developing the Bluetooth serial port adapter and Android Studio for the App.The ultra-fast thermal cycle fluorescent quantitative PCR system was used to detect influenza A/B virus and SARS-CoV-2 to verify its performances.Results The ultra-fast thermal cycle fluorescent quantitative PCR system realized rapid nucleic acid detection of influenza A/B virus and SARS-CoV-2,and the detection results were in high agreement with those by conventional real-time quantitative PCR.Conclusion The ultra-fast thermal cycle fluorescence quantitative PCR system gains advantages in small size and light weight,and can be used for rapid on-site detection of pathogen nucleic acids.[Chinese Medical Equipment Journal,2023,44(11):15-20]

This study was aimed to establish the reliable genotyping method of human platelet antigens of HPA-15 system by PCR-SSP and to use this assay in the further HPA genotyping of volunteer platelet donors. 3 sequence-specific primers recommended by the 11th Platelet Genotyping and Serology Workshop on behalf of International Society of Blood Transfusion (ISBT) were synthesized. The concentration of each primer pair, the concentration of Mg(2+) and the PCR conditions were adjusted to optimize the conditions so that HPA-15 system could be specific amplified. The accuracy and reliability of the developed assay was evaluated and confirmed by typing the coded DNA samples provided by the 11th Platelet Genotyping and Serology Workshop. As a parallel control, a total of 50 volunteer platelet donors in Shenzhen were genotyped by both our assay and the G&T commercial kit at HPA-15 system. 10 coded samples distributed by the 11th Platelet Genotyping and Serology Workshop were genotyped by established PCR-SSP method. The results showed that a concordance rate of 100% was observed between the results obtained by established PCR-SSP method and the results provided by ISBT report. The HPA gene frequencies observed in 50 randomly-selected platelet donors in Shenzhen were 0.5100 and 0.4900 for HPA-15a and HPA-15b respectively. In conclusion, PCR-SSP assay established in our study provides a simple, rapid and accurate method for HPA-15 system genotyping, which assay is suitable for routine clinical HPA genotyping and shows a broad prospect in its further applications.
Antigens, CD ; genetics ; immunology ; Antigens, Human Platelet ; genetics ; GPI-Linked Proteins ; Genotype ; Humans ; Isoantigens ; genetics ; immunology ; Neoplasm Proteins ; genetics ; immunology ; Polymerase Chain Reaction ; methods ; Polymorphism, Single-Stranded Conformational

OBJECTIVETo study the feasibility of osteogenic phenotype expression by human skin fibroblasts induced in polyglycolic acid (PGA) foams and the effect of tumor necrosis factor-alpha (TNF-alpha) on the expression of bone morphogenetic protein (BMP) receptors.

METHODSThe fibroblasts were isolated, purified from human skin. (1) Fibroblasts were seeded onto PGA foams. The cell-PGA complexes were cultured in RCCS for 6 weeks, in the media of TNF-alpha (50 U/ml) and BMP-2 (0.1 microg/ml). 1 d, 3 and 6 weeks later, cells and extracellular matrix were investigated by electron microscopic and histochemistry observation respectively. Secretion of osteogenic markers were analyzed by biochemical methods. (2) Fibroblasts were seeded on the glass fragments or culture flasks and treated with TNF-alpha (50 U/ml) in different usage (one-time, all-time). The RT-PCR method and the immunohistochemistry fluorescence staining were used to examine the influence of TNF-alpha on the mRNA expression and the protein expression of the type I BMP receptors at 2, 4, 6, 8 d after treatment.

RESULTSFibroblasts seeded on the PGA foams formed 3-dimensional matrix 3 weeks after seeding, which was demonstrated as osteo-tissue by tetracycline labeling and ARS staining. Cells secreted much more bone-specific alkaline phosphatase (B-AKP) and osteocalcin (OCN) into supernatant than the cells that were cultured in the media without TNF-a and BMP2. Eight days after all-time usage, the TNF-alpha (50 U/ml) increased the expression of the mRNA and protein of the type IB BMP receptor.

CONCLUSIONSFibroblasts on 3-D cell-foam structures can express osteoblastic phenotype under certain inducing conditions. The numerous fibroblasts in body would be a promising resource for cell seeds candidate of tissue- engineered bone. TNF-alpha provides the essential condition for BMP2's target effect on fibroblasts, and combined use of TNF-alpha and BMP2 is one of the regulating factors.

Bone Morphogenetic Protein 2 ; Bone Morphogenetic Protein Receptors, Type I ; biosynthesis ; genetics ; Bone Morphogenetic Protein Receptors, Type II ; biosynthesis ; genetics ; Bone Morphogenetic Proteins ; pharmacology ; Cell Culture Techniques ; methods ; Cell Differentiation ; drug effects ; Cells, Cultured ; Drug Synergism ; Fibroblasts ; cytology ; drug effects ; metabolism ; Humans ; Phenotype ; Polyglycolic Acid ; Transforming Growth Factor beta ; pharmacology ; Tumor Necrosis Factor-alpha ; pharmacology

Objective To explore the optimized method of venous anastomosis for right donor kidney transplantation in rats.Methods Sprague Dawley (SD) rats were used as donors and recipients for homologous rat kidney transplantation.Both bilateral kidneys were harvested from the donor rats (n =45).Ninety rats were used as recipients and divided into 4 groups according to randomly digital table:In groups AC (n =15 each),the right donor kidneys were transplanted into the left nephridial pit of recipients,and endto-side,venous bypass and modified end-toend (donor's proximal end of vena cava was anastomosed to recipients renal Vein followed by ligation of its distal end) venous anastomosis was done,respectively; In the control group (n =45),the left donor kidneys were transplanted into the same side of the recipients,and the conventional end-to-end venous anastomosis was used.Then the intra-operative findings,successful operation rate and postoperative complications were compared between two groups.Results The venous anastomosis time in group B was longer than in groups A,C and control group (P＜0.05),which significantly increased warm ischemia time of donor kidneys and operative time of recipients (P＜0.05).The venous anastomosis time,warm ischemia time of donor kidneys and operative time of recipients showed no significant difference between groups A or C and control group (P＞0.05).The successful operation rate in group C (93.3％)was similar to that in control group (86.7％) (P＞0.05),but higher than in group A (53.3％) and group B (53.3％) (P＜0.05).There was no significant difference in postoperative complications between group A and group C.Conclusion For right donor kidney transplantation,the method of harvesting the right donor kidney with a part of vena cava,and then anastomosing the proximal end to recipients renal vein and ligating the distal end,is highly feasible,efficient and economic.

Coal Mining ; Humans ; Microbial Sensitivity Tests ; Pneumoconiosis ; microbiology ; Pseudomonas Infections ; microbiology ; Pseudomonas aeruginosa ; drug effects ; enzymology ; Respiratory Tract Infections ; microbiology ; Sputum ; microbiology ; beta-Lactam Resistance

Objective: Hippocampal neuron apoptosis contributes to autism, while METTL3 has been documented to possess great potentials in neuron apoptosis. Our study probed into the role of METTL3 in neuron apoptosis in autism and to determine the underlying mechanism. Methods: Bioinformatics analysis was used to analyze expressed genes in autism samples. Institute of Cancer Research mice were treated with valproic acid to develop autism models. The function of METTL3 in autism-like symptoms in mice was analyzed with behavioral tests and histological examination of their hippocampal tissues. Primary mouse hippocampal neurons were extracted for in vitro studies. Downstream factors of METTL3 were explored and validated. Results: METTL3, MALAT1, and Wnt/β-catenin signaling were downregulated, while SFRP2 was upregulated in the hippocampal tissues of a mouse model of autism. METTL3 stabilized MALAT1 expression by promoting m6A modification of MALAT1. MALAT1 promoted SFRP2 methylation and led to reduced SFRP2 expression by recruiting DNMT1, DNMT3A, and DNMT3B to the promoter region of SFRP2. Furthermore, SFRP2 facilitated activation of the Wnt/β-catenin signaling. By this mechanism, METTL3 suppressed autism-like symptoms and hippocampal neuron apoptosis. Conclusion This research suggests that METTL3 can reduce autism-like symptoms and hippocampal neuron apoptosis by regulating the MALAT1/SFRP2/Wnt/β-catenin axis.

OBJECTIVE: To seek a exact method of estimating postmortem interval (PMI). METHODS: This study detected the concentration of zincum(Zn) and nickel(Ni) in vitreous humor of rabbit at hour 96 after death and explored the relationship between their concentration and PMI using a method ICP-MS. RESULTS: The concentration of Zn and Ni in vitreous humor of rabbit at hour 24 after death were related to PMI significantly; The formulae of the relationship between PMI and Zn concentrations is y = 0.1404x2 - 1.3351x + 3.8298 (within 24 h; R2 = 0.9202). The formula of the relationship between PMI and Ni concentrations is y = 0.0043x2 - 0.0596x + 0.2665(within 24 h; R2 = 0.9103). CONCLUSION The concentration of Zn and Ni in vitreous humor of rabbit may be a reference indicator to estimate early PMI.
Animals ; Female ; Forensic Medicine ; Male ; Nickel/analysis* ; Postmortem Changes ; Rabbits ; Time Factors ; Vitreous Body/chemistry* ; Zinc/analysis*

Objective To study the anatomical classification and surgical management of communicating tumors invading the anterior or middle skull base. Methods According to the location and growth direction of the tumors, the communicating tumors invading the anterior or middle skull base in 29 patients were classified into 4 types, namely fronto-naso-orbital tumors in 16 cases, middle-lateral cranial base tumors in 8 cases, central-medial skull base tumors in 4 cases and petrous bone-jugular foramen tumor in 1 case. Based on this classification, extended transbasal approach (13 cases), supraorbital-pterional approach (9 cases), fronto-temporal approach (3 cases), ffontotemporal-orbitozygomatic approach (3 cases) and transpetrol approach (1 case) were adopted for tumor resection and skull base defect reconstruction. In the transbasal approach group, the surgery was performed also through transnasal endoscopic approaches. Results Twenty-four patients underwent total tumor resection and 5 had subtotal tumor resection. No operative death or serious complications (e.g. intracranial infection, cerebrospinal fluid leakage or meningoencephalocele) occurred after the operations. Conclusion Classification of the communicating tumors invading the anterior or middle skull base according to their location and growth direction facilitates planning of the surgical approaches for tumor resection and skull base defect reconstruction.