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Bone defects, often accompanied by osteomyelitis, soft tissue contusions, etc, are facing lengthy treatment process and slow healing, seriously jeopardizing the structural integrity of the human bone tissue. Currently, the main treatment for bone defects involves autologous or allogeneic bone transplant. However, autologous bone transplant poses problems, including long surgical duration, increased pain and complications such as infections. Additionally, immune rejection reactions also limit the effectiveness of allogeneic bone transplant of the same species. Bone scaffolds have become a potential alternative for bone transplant, but problems such as sharp edges of the scaffolds and poor compatibility with human tissues exist. Triply periodic minimal surface (TPMS), with an average curvature of zero has lower levels of stress concentration and the ability to be precisely expressed with mathematical formulas, compared with other structures. Its application in bone scaffolds attracts much attention, but there is currently a lack of comprehensive understanding of the impacts of different types of TPMS on the performance of bone scaffolds. With this purpose, the authors reviewed the research progress in the impacts of different types of TPMS on the performance of bone scaffolds, providing a reference for the construction of bone scaffolds.
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Femoral fracture is a common type of fracture in clinical practice, and poor fracture reduction may lead to malunion and dysfunction. At present, traditional reduction with manipulation and intramedullary nailing are the mainstream treatments, but there exist problems such as X-ray exposure or poor reduction. Fracture reduction robots are of positive significance in improving the safety of surgical treatment of femur fracture, avoiding repetitive operations and poor alignment, and shortening the patients′ postoperative recovery time. Navigation algorithm is the key to achieve the function of femoral repositioning. Understanding the advantages and disadvantages that various types of navigation algorithms demonstrated in femoral reduction applications is important for giving full play to the value of fracture reduction robots in femoral reduction. Therefore, the authors reviewed the research progress in existing robot navigation algorithms applied in femoral fracture repositioning from the following four aspects, including image alignment algorithm, algorithm for establishing the target pose of femoral repositioning, algorithm for compensating the mechanical error, and algorithm for path planning, hoping to provide a reference for the application and research of navigation algorithms of fracture reduction robots.
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OBJECTIVE@#To review the research progress of design of bone scaffolds with different single cell structures.@*METHODS@#The related literature on the study of bone scaffolds with different single cell structures at home and abroad in recent years was extensively reviewed, and the research progress was summarized.@*RESULTS@#The single cell structure of bone scaffold can be divided into regular cell structure, irregular cell structure, cell structure designed based on topology optimization theory, and cell structure designed based on triply periodic minimal surface. Different single cell structures have different structural morphology and geometric characteristics, and the selection of single cell structure directly determines the mechanical properties and biological properties of bone scaffold. It is very important to choose a reasonable cell structure for bone scaffold to replace the original bone tissue.@*CONCLUSION@#Bone scaffolds have been widely studied, but there are many kinds of bone scaffolds at present, and the optimization of single cell structure should be considered comprehensively, which is helpful to develop bone scaffolds with excellent performance and provide effective support for bone tissue.
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Osso e Ossos , Alicerces TeciduaisRESUMO
OBJECTIVE@#To summarize the influence of microstructure on performance of triply-periodic minimal surface (TPMS) bone scaffolds.@*METHODS@#The relevant literature on the microstructure of TPMS bone scaffolds both domestically and internationally in recent years was widely reviewed, and the research progress in the imfluence of microstructure on the performance of bone scaffolds was summarized.@*RESULTS@#The microstructure characteristics of TPMS bone scaffolds, such as pore shape, porosity, pore size, curvature, specific surface area, and tortuosity, exert a profound influence on bone scaffold performance. By finely adjusting the above parameters, it becomes feasible to substantially optimize the structural mechanical characteristics of the scaffold, thereby effectively preempting the occurrence of stress shielding phenomena. Concurrently, the manipulation of these parameters can also optimize the scaffold's biological performance, facilitating cell adhesion, proliferation, and growth, while facilitating the ingrowth and permeation of bone tissue. Ultimately, the ideal bone fusion results will obtain.@*CONCLUSION@#The microstructure significantly and substantially influences the performance of TPMS bone scaffolds. By deeply exploring the characteristics of these microstructure effects on the performance of bone scaffolds, the design of bone scaffolds can be further optimized to better match specific implantation regions.
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Alicerces Teciduais/química , Engenharia Tecidual/métodos , Osso e Ossos , PorosidadeRESUMO
Objective:To evaluate the efficacy of laparoscopic splenectomy plus pericardial devascularization combined with gastroscopic (double endoscopy) treatment of patients with cirrhosis and portal hypertension presenting with bleeding esophagogastric varices.Methods:To retrospectively analyze 108 patients who presented with bleeding esophageal and gastric varices at the First Hospital of Jiaxing from March 2013 to March 2018. Of 108 patients, there were 61 males and 47 females, with an average age of 61 years. According to the disease and desires of patients and family members, 28 patients underwent laparoscopic splenectomy plus devascularization (the laparoscopic group), 43 endoscopic treatment (the endoscopic group) and 37 double endoscopic treatment (the double endoscopic group). The liver function, renal function, hemoagglutination and degrees of recurrence of the three groups were compared after operation.Results:The renal function, coagulation function, HbA1c in the double endoscopic group was significantly better than that in the other two groups ( P<0.05). In the laparoscopic group, there were 4 patients who presented with rebleeding within 36 months, compared with 3 in the endoscopic group, and no patients in the combined group. At 36 months after operation, gastroscopy performed in the laparoscopic group showed mild varices in 8(28.6%) patients, moderate in 9(32.1%), and severe in 11(39.3%). In the endoscopic group, there were 7(16.3%) patients with mild, 26(60.5%) with moderate, and 10(23.2%) with severe. In the double endoscopic group, there were 32(86.5%) patients with mild and 5(13.5%) with moderate. The degrees of recurrence and postoperative esophageal and gastric varices rebleeding in the double endoscopic group were significantly better than those in the laparoscopic group and the endoscopic group ( P<0.05). Conclusion:Laparoscopic combined with endoscopic treatment was more effective in patients with cirrhosis and portal hypertension who presented with bleeding esophageal varices.
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Objective@#To investigate the effect of thalidomide on the expressions of Th17 cells, interleukin 17 (IL-17), macrophage inflammatory protein 3α (MIP3α) in peripheral blood of patients with diffuse large B-cell (DLBCL) and 3-year survival rate.@*Methods@#Sixty patients with DLBCL from January 2009 to January 2013 in the Affiliated Hospital of Hebei University of Engineering were enrolled. According to envelope method, the patients were randomly divided into the combined group (n = 30, thalidomide combined with CHOP regimen) and chemotherapy group (n = 30, CHOP regimen alone). Clinical adverse reactions, efficacy, the expressions of Th17 cells, IL-17, MIP3α in peripheral blood before and after treatment, and 3-year survival rate between two groups were compared.@*Results@#The total effective rate and 3-year survival rate were 73.3% (22/30) vs. 46.7% (14/30), 87.4% vs. 40.7% respectively in the combined group and the chemotherapy group (both P < 0.05). The levels of Th17 cells percentage and the expression level of IL-17 before and after treatment in combined group were (0.52±0.14)% vs. (1.61±0.53)%, (5.61±0.75) pg/ml vs. (8.87±1.84) pg/ml, and the difference was statistically significant (both P < 0.05). However, the expression levels of Th17 cells and IL-17 before and after treatment in the chemotherapy group were (0.75±0.05)% vs. (0.74±0.07)%, (5.69±0.29) pg/ml vs. (5.26±0.24) pg/ml, and there was no statistical difference (both P > 0.05). The levels of IL-17 and MIP3α mRNA in peripheral serum before and after treatment in the combined group were 8.51±0.23 vs.13.96±0.89, 27.4±1.5 vs. 83.0±8.5 (both P < 0.05). While in the treatment group before and after treatment the above mentioned were 8.85±0.32 vs. 9.45±0.55, 23.7±1.8 vs. 38.7±5.5, and the difference was no statistically significant (both P > 0.05). There was no statistical difference in the adverse reactions between the combined group and the chemotherapy group (P > 0.05).@*Conclusion@#Thalidomide may prolong survival time of DLBCL patients by intervening Th17 cells and associated cytokines.
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Objective To investigate the expression of miRNA (miR-21) in mucosa-associated lymphoid tissue(MALT) lymphomas and its relationship with the effects in CHOP regimen. Methods Lymph gland tissues and preoperative peripheral blood of 52 patients pathologically diagnosed with MALT lymphoma in Department of Hematology of Affiliated Hospital of Hebei University of Engineering from January 2015 to December 2017 were collected; meanwhile, 10 tissues from patients with lymphadenitis and 20 peripheral serum from healthy examination patients were also collected. Quantitative real-time polymerase chain reaction (qPCR) was used to compare the lymph gland tissues in MALT lymphoma patients and lymphadenitis patients, and the expression of miR-21 in peripheral serum of MALT lymphoma and healthy people. The selected 20 cases of MALT lymphoma were given CHOP regimen treatment for 6 cycles, and then the efficiency and inefficiency were compared; at the same time, the expression of miR-21 in peripheral serum of the patients in the effective group was detected. Results The relative expression of miR-21 of lymph node tissues in lymphadenitis patients and MALT lymphoma patients was 1.03±0.12 and 4.53±0.73 respectively, and the relative expression of miR-21 in preoperative peripheral serum of healthy people and MALT lymphoma patients was 0.83±0.04 and 3 . 87 ± 0 . 21 respectively , and the differences were statistically significant (P ＝ 0.047, P ＝ 0.044). After 6 cycles of CHOP regimen, the total effect rate of MALT lymphoma was 70 % (14/20), and the relative expression of miR-21 in preoperative and postoperative peripheral serum for the patients who obtained the effective results after CHOP regimen was 3.95 ±0.08 and 1.62 ±0.41, and the differences were statistically significant (P＝ 0.035). Conclusions The expression of miR-21 has a certain correlation with the occurrence and development of MALT lymphoma. Furthermore, the serum miR-21 expression may be related to the effect of CHOP regimen chemotherapy in MALT lymphoma.
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OBJECTIVE:To establish a method for the determination of related substances in anastrozole. METHODS:HPLC was performed on the column of Welch Materials XB C18 with mobile phase of acetonitrile-water(35:65,V/V)at a flow rate of 1.0 mL/min,detection wavelength was 210 nm,column temperature of 25 ℃,and the injection volume was 20 μL. RESULTS:Only one impurity(impurity A)was detected in anastrozole,the linear range was 0.1-1.6 μg/mL(r=0.9996);limit of quantitation was 0.1 μg/mL,limit of detection was 0.02 μg/mL;RSDs of precision,stability and reproducibility tests were lower than 2%;recovery was 98.95%-105.29%(RSD%=1.78%,n=9). CONCLUSIONS:The method is simple,accurate,and can be used for the determination of related substances in anastrozole.
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Background:1 α,25-dihydroxyvitamin D3 [1,25 (OH) 2 D3],the active form of vitamin D,is reported in some studies having antifibrotic potential in liver fibrosis,however,its mechanism is not fully clarified.MicroRNAs (miRNAs) have recently been shown could regulate the proliferation and activation of hepatic stellate cells (HSCs),and are involved in the promotion or inhibition of liver fibrosis.Aims:To explore whether the inhibiting effect of 1,25 (OH) 2 D3 on activation of HSCs is by regulating miRNAs expression.Methods:Literature review and qPCR method were used to screen out the differentially expressed miRNAs between transforming growth factor-β1 (TGF-β1)-stimulated (activated) HSCs and the inactivated HSCs.Then the HSCs were co-cultured with TGF-β1 and the mimic of differentially expressed miRNA,the negative control mimic,1,25(OH)2D3 and DMSO,respectively,and the cell viability and apoptosis were determined by CCK-8 assay and flow cytometry.Results:Expression of miR-146a was down-regulated in activated HSCs (P ＜ 0.05).Compared with HSCs in DMSO group,the expression of miR-146a was significantly up-regulated in HSCs treated with 1,25 (OH) 2 D3;meanwhile,the cell viability was decreased and the apoptosis was increased (P all ＜ 0.05).In HSCs transfected with miR-146a mimic,the expression of miR-146a was up-regulated,the cell viability was decreased,and the apoptosis was increased similarly with HSCs in 1,25 (OH)2D3 group (P all ＜ 0.05).Conclusions:Regulation of miR-146a expression might be one of the important mechanisms of 1,25 (OH) 2 D3 in inhibiting TGF-β1-stimulated HSC activation and inducing apoptosis in HSCs.
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Objective To evaluate the influence of cytotoxin-associated gene A (CagA)to the differentiation of helper T lymphocytes in chronic gastritis. Methods Eighty patients with chronic gastritis were included in this study. The serum antibody against CagA was detected by the enzyme-linked immunosorbant assay (ELISA). Patients were divided into CagA-positive group and CagA-negative group according to the results of ELISA. Pathologic changes in gastric mucus were respectively analyzed. In addition, the expressions of nuclear transcription factors in gastric mucus including TBX 21, GATA-3, FoxP3 and Rorγt were detected by PCR and Western blot assay. Results There were 52 patients in CagA-positive group and 28 patients in CagA-negative group. The gastric inflammation was more serious in CagA-positive group than that in CagA-snegative group. There was no significant difference in Hp density between two groups. The expressions of GATA-3 and FoxP3 were much higher, while the transcription and protein expression levels of TBX21 and Rorγt were significantly lower in CagA-positive group than those in CagA-negative group. Conclusion Although the inflammation in gastric mucus was more serious in CagA-positive patients, Hp can not be effectively eliminated,which may relate to the differentiation of Th0 into Th2/Treg cells.
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<p><b>OBJECTIVE</b>To establish the atherosclerosis models (AS) in rats and observe the change process of AS and Shenlian decoction's pharmacological effect.</p><p><b>METHOD</b>Two hundreds and forty rats were randomly divided into blank control group, model group, positive medicine group, the high-dose, middle dose and low-dose Shenlian decoction groups. Vascular pathological changes were observed by the methods of HE stain. The levels of TC, TG, LDL-C, HDL-C, NO in serum were determined respectively by enzyme colorimetric, clear and nitrate reductase methods. ET, TXB2, 6-keto-PGF1 alpha, TNF-alpha, IL-6 and IL-8 levels in serum were detected by radioimminoassay.</p><p><b>RESULT</b>Compared with the model group, vascular lesion of different doses of Shenlian decoction groups were significantly improved, the TG, NO, TXB2 levels in serum were significantly lower (P < 0.05), while high-dose Shenlian decoction can significantly reduce TNF-alpha, IL-6, IL-8 levels in serum (P < 0.05).</p><p><b>CONCLUSION</b>Shenlian decoction can inhibit the formation and development of AS by regulating blood lipids, improving endothelial function and reducing inflammatory factors release.</p>