A Preliminary Study on the Construction and Visualization of Knowledge Graph for the Ancient Chinese Medical Book Ling Shu / 广州中医药大学学报

Objective To explore the construction and visualization for knowledge graph of Ling Shu(Spiritual Pivot),with a view to providing ideas for the structured storage and display of the theoretical knowledge of the ancient Chinese medical books.Methods Using the professional idea of constructing knowledge graphs for reference,text mining technology was applied to construct the thesaurus,and then word division,entity recognition,and relationship extraction for the original text of Ling Shu were performed to get the elements of knowledge graph construction.The graph database Neo4j was used for the storage and query of the knowledge graph,and then the visual display of the knowledge graph was achieved.Results The 1 216 high-quality words consisting of the thesaurus of Ling Shu were obtained,and the construction of the knowledge graph of the theory of Ling Shu was realized.The constructed knowledge graph basically displayed the traditional Chinese medicine theories such as the correlation of visceral manifestations with essence qi,and the relationship between emotions and the five-zang organs described in Ling Shu,which made the retrieval and utilization of the related entities and relationships possible,and provided ideas for the structured storage and display of the theoretical knowledge of the ancient books of Chinese medicine.Conclusion The knowledge graph construction technology can be used to obtain the Chinese medicine theoretical knowledge graph of Ling Shu,and to display the knowledge connections of yin-yang and the five elements,and the internal organs and meridians expressed in the Ling Shu.The construction of the knowledge graph and its storage in the graph database enable the knowledge graph involved in the text of Ling Shu to be displayed in the form of visualized semantic network graph,and also make the embedding of other search systems such as the semantic search and semantic wiki possible,which will be helpful for the development of Chinese medicine intelligent medical services.

WNK2 delays the proliferation and invasion of hepatocellular carcinoma by inhibiting the ERK1/2/ROS/SHP2 signaling pathway / 中国实验动物学报

Objective To investigate the effect of WNK2 on the ERK1/2/ROS/SHP2 signaling pathway in hepatocellular carcinoma(HCC)and to explore its role in cell proliferation and migration in HCC.Methods HepG2 cells were transfected with WNK2-mimic,sh-RNA WNK2,and corresponding negative control.The effect of WNK2 on the proliferation of HCC was examined by subcutaneous tumorigenesis assay in BALB/c nude mice.The expressions of WNK2,p40,gp90,p-SHP2,p-AKT,and p-ERK1/2 in tumor tissues were detected by Western Blot.After treatment with SHP2 inhibitor PHPS1,the expressions of WNK2,P40,gp90,p-SHP2,p-AKT,and p-ERK1/2 in HepG2 cells were detected by Western Blot.The migration ability and invasion ability of HepG2 cells were detected by cell scratch assay and Transwell.The proliferation ability of HepG2 cells was detected by monoclonal proliferation assay.Results Compared with the sh-NC group,the tumor volume of nude mice in the sh-RNA WNK2 group was significantly increased(P＜0.01);Compared with the NC-mimic group,the tumor volume of nude mice in the WNK2-mimic group was significantly reduced(P＜0.01).Western Blot result showed that compared with the sh-NC group,the expression of WNK2 in the sh-RNA WNK2 group was significantly decreased(P＜0.01),while the expressions of p40,gp90,p-SHP2,p-AKT and p-ERK1/2 were significantly increased(P＜0.01).Compared with the NC-mimic group,the expression of WNK2 was significantly increased in the WNK2-mimic group(P＜0.01),and the expressions of p40,gp90,p-SHP2,p-AKT,and p-ERK1/2 were significantly decreased(P＜0.01).In vitro experiment,compared with the sh-NC group,the expression of WNK2 was significantly decreased in the sh-RNA WNK2 group(P＜0.01),while the expressions of p40,gp90,p-SHP2,p-AKT and p-ERK1/2 were significantly increased in the sh-RNA WNK2 group(P＜0.01).Compared with the sh-NC+PHPS1 group,the expression of WNK2 was significantly decreased in the sh-RNA WNK2+PHPS1 group(P＜0.01),while the expressions of p40,gp90,p-SHP2,p-AKT,and p-ERK1/2 were reversed and had no significant differences compared with the sh-NC+PHPS1 group(P＞0.05).The cell scratch assay and Transwell result showed that the migration and invasion ability of HepG2 cells in the sh-RNA WNK2 group was significantly increased compared with the sh-NC group(P＜0.01).The migration and invasion ability of HepG2 cells in the sh-NC+PHPS1 group and sh-RNA WNK2+PHPS1 group were significantly decreased with no significant difference(P＞0.05).The result of the monoclonal proliferation experiment showed that the proliferation capacity of HepG2 cells in the sh-RNA WNK2 group was significantly increased compared with the sh-NC group(P＜0.01),while the proliferation ability of HepG2 cells in the sh-NC+PHPS1 group and sh-RNA WNK2+PHPS1 group was significantly decreased with no significant difference(P＞0.05).Conclusions WNK2 can inhibit the ERK1/2/ROS/SHP2 signaling pathway,thereby inhibiting ERK1/2/Akt signaling and delaying the proliferation and migration of HCC.

The evaluation framework of clinical research risk and benefit is constructed / 中国医学伦理学

Objective:Currently,the medical Institutional Review Board(IRB)mainly rely on experience to analyse the risks and benefits of clinical research,lacking an assessment framework of risks and benefits.Methods:Using grounded theory,interviews were conducted on 29 ethical review workers in China.Through open coding,spindle coding,and selective coding,the framework of risks and benefits for clinical research in China was constructed.NVivo11 software was used for data storage,organization,encoding,and analysis.Results:A framework of risks and benefits for clinical research was proposed based on China's national conditions.Clinical research risks consisted of physiological risk,psychological risk,economic risk,and social risk.Research benefits consisted of subject benefits and society benefits.Conclusion:This paper systematically explained the connotation of the risks and benefits of clinical research,and constructed a framework of the risks and benefits of clinical research applicable to China.It has certain innovations in theoretical research,and also provides use for reference for researchers and ethics committees to evaluate risks and potential benefits in clinical research.

Ethanol extract of Abelmoschus manihot suppresses endoplasmic reticulum stress in contrast-induced nephropathy

@#Objective: To explore the efficacy and potential mechanisms of the ethanol extract of Abelmoschus manihot (L.) Medic in contrast-induced nephropathy (CIN). Methods: CIN rat models and human renal proximal tubular cells (HK-2) with iopromide-induced injury were employed to mimic CIN conditions. The effect of Abelmoschus manihot extract on the rat models and HK-2 cells was evaluated. In rat models, kidney function, histology, oxidative stress and apoptosis were determined. In HK-2 cells, cell viability, apoptosis, mitochondrial membrane potential, and endoplasmic reticulum stress were assessed. Results: Abelmoschus manihot extract significantly improved structural and functional impairments in the kidneys of CIN rats. Additionally, the extract effectively mitigated the decline in cellular viability and reduced iopromide-induced oxidative stress and lipid peroxidation. Mechanistic investigations revealed that Abelmoschus manihot extract prominently attenuated acute endoplasmic reticulum stress-mediated apoptosis by downregulating GRP78 and CHOP protein levels. Conclusions: Abelmoschus manihot extract can be used as a promising therapeutic and preventive agent in the treatment of CIN.

Exploration and construction of an evaluation indicator framework for clinical research benefits in China / 中国医学伦理学

ObjectiveThe aim is to construct an evaluation framework for clinical research benefits， and provide a reference for the formulate of evaluation standards for clinical research benefits. MethodsThe Delphi method was used to carry out expert consultation， and the mean， score of importance， coefficient of variation and coordination， etc. of evaluation indicators were summarized and calculated， to screen evaluation indicators for clinical research benefits. ResultsTwenty-three experts in this field were selected for correspondence， and their enthusiasm was 100% in both rounds， the authority coefficients were≥0.90， and Kendall’s coefficients of concordance were<0.25 （P<0.001）. By referring to the mean and coefficient of variation of the indicators， as well as combining them with expert suggestions， an evaluation framework for clinical research benefits was ultimately formed with 2 primary indicators， 5 secondary indicators， and 8 tertiary indicators. ConclusionThe evaluation framework for clinical research benefits constructed in this paper can comprehensively evaluate the research benefits， as well as provide a basis for reasonably determining the research risk-benefit ratio and developing quantitative evaluation tools for clinical research benefits.

Recent advances in radiotherapy combined with systemic treatment for breast cancer brain metastasis / 中华放射肿瘤学杂志

Breast cancer brain metastasis (BCBM) is the second most common brain metastasis cancer, which is usually characterized by multiple lesions. Radiotherapy is an important local treatment for BCBM, which includes stereotactic radiotherapy, whole brain radiotherapy (WBRT) combined with simultaneous integrated boost and WBRT (such as conformal WBRT and hippocampal avoidance - WBRT) . Meanwhile, systemic treatment of BCBM has progressed rapidly, showing a positive effect in delaying the incidence of brain metastases, maintaining asymptomatic or unprogressive brain metastases, and delaying initial or salvage local treatments. In recent years, some studies have shown that radiotherapy combined with systemic treatment for BCBM has better application prospect compared with radiotherapy alone. In this article, the radiotherapy progress of brain metastases, the role of systemic therapy in BCBM, and the clinical research of radiotherapy combined with systemic therapy were reviewed, aiming to provide some reference for clinical research in this field.

Effect of admission mode of acute pancreatitis patients on retroperitoneal infection and prognosis / 中华急诊医学杂志

Objective:To explore the relevance between secondary retroperitoneal infection, as well as the outcomes, and the approach of intensive care unit (ICU) admission for the patients suffered from acute pancreatitis.Methods:Patients with acute pancreatitis admitted to the ICU of the Second Affiliated Hospital of Anhui Medical University from January 2013 to July 2022 were retrospectively analyzed. According to ICU admission approaches, the patients were divided into the emergency group (first admission or transferred from the emergency department) and the delayed group (transferred from the general wards due to disease evolution). Patients were also divided into retroperitoneal infection group and non-retroperitoneal infection group according to whether retroperitoneal infection was accompanied. Patients' baseline data including gender, age, underlying diseases, laboratory test indicators, acute physiology and chronic health evaluationⅡ score (APACHEⅡ), sequential organ failure assessment (SOFA), computed tomography severity index (CTSI), bedside index of severity in acute pancreatitis (BISAP), and acute complications were collected. Univariate and multivariate logistic regression was used to analyze the risk factors of retroperitoneal infection in patients with acute pancreatitis.Results:A total of 271 patients with acute pancreatitis were enrolled, including 95 cases in the emergency group and 176 cases in the delayed group. The cohort included 71 cases with and 200 cases without retroperitoneal infection development. The incidence of retroperitoneal infection and the 30-day mortality of patients in the delayed group, which was observed with a significantly longer ICU stay (days), [(15.4±21.3) vs. (8.6±10.8), P<0.05], were significantly higher than those in the emergency group [retroperitoneal infection incidence rate: 31.82% (56/176) vs.15.79%(15/95), 30-day mortality: 13.64%(24/176) vs. 4.21%(4/95), both P<0.05]. Univariate Logistic analysis showed significant differences in diabetes, APACHEⅡ, SOFA, CTSI and BISAP score, urea nitrogen, creatinine, blood calcium, D-D dimer, peritoneal puncture catheter drainage and ICU transferred from general wards due to disease evolution between the retroperitoneal infection group and the non-retroperitoneal infection group. Multivariate Logistic regression analysis showed that diabetes, SOFA score, CTSI score, peritoneal puncture catheter drainage and transfered from general wards to ICU due to disease evolution were independent risk factor for retroperitoneal infection in acute pancreatitis patients[odds ratio were 3.379, 1.150, 1.358, 3.855, 2.285, respectively]. Conclusions:Acute pancreatitis patients in ICU transferred from general wards are more likely to develop retroperitoneal infection, and have a higher risk of mortality and a longer ICU stay. Delayed admission to ICU, diabetes, SOFA score, CTSI score and peritoneal puncture catheter drainage are independent risk factors for retroperitoneal infection in patients with acute pancreatitis.

Automatic bone age estimation of costal cartilage CT Images based on deep learning / 中国法医学杂志

Objective To use the deep learning methods to extract features of the 1st to 7th adult costal cartilage CT reconstruction images to realize the automatic estimation of adult costal cartilage bone age.Methods 625 male and 625 female samples aged between 20 and 70 years old were collected retrospectively,and the corresponding VRT images were reconstructed by volume rendering technology(VRT).After image preprocessing and data augmentation,500 cases were used as the training set and 125 cases as the test set.The performance of ResNet,ResNeXt,DenseNet and GoogleNet networks was evaluated by using 5-fold cross-validation,and the average value of 5-fold cross-validation results was taken as the final estimation result.Results The ResNet50 network achieved the best results in both male and female datasets.The mean absolute error was 4.56 years and 3.91 years,the accuracy rate was 64.00%and 70.88%in the range of±5.0 years,88.96%and 94.40%in the range of±10.0 years,respectively.Conclusion Compared with traditional methods and machine learning methods,the deep learning models can avoid the influence of human factors,greatly improve the accuracy of adult costal cartilage bone age estimation,and reduce the error between predicted age and real age,which has high clinical application value.

Study on extraction technology for Sihuang Shaoshang ointment based on HPLC fingerprint and principal component analysis / 中国药师

Objective To optimize extraction technology for Sihuang Shaoshang ointment by orthogonal test,and establish the HPLC fingerprint of Sihuang Shaoshang ointment to provide references for the quality evaluation of the preparation.Methods Taking Sihuang Shaoshang ointment as the model drug,the fingerprints were established by HPLC method,the common peak areas were analyzed by principal component analysis,and the total factor scores were used as the evaluation index.The technological parameters such as extraction times,extraction time and liquid-solid ratio were optimized by orthogonal test,and the optimal extraction process parameters were screened out.Results The common mode of fingerprint was set up with 12 common peaks and the two principle components with the accumulative contribution rate of 84.751% extracted by principal component analysis were screened out to calculate the comprehensive scores of 9 samples.The optimal extraction process was as follows:10-fold amount of water,extracting 3 times,and extracting 2 h for each time.Conclusion The established method is simple and effective,which can provide a reference for the extraction process optimization of Sihuang Shaoshang ointment.

Antibacterial copper sulfide/graphene oxide nanosheets composite film promotes angiogenic and osteogenic differentiation in vitro / 中华创伤骨科杂志

Objective:To investigate whether the antibacterial copper sulfide (CuS)/graphene oxide (GO) nanosheets composite film can promote angiogenesis and osteogenesis in vitro. Methods:GO and CuS/GO nanosheets were synthesized and mixed into polyvinyl alcohol (PVA)/carboxymethyl cellulose (CMC) hydrogel films. The study was conducted in 4 groups: PVA/CMC/GO, PVA/CMC/CuS/GO, PVA/CMC (only PVA/CMC-based film) and blank control (no material). The PVA/CMC, PVA/CMC/GO and PVA/CMC/CuS/GO films were characterized by electron scanning microscopy and energy dispersive spectrometer. The biocompatibility of different films (PVA/CMC/CuS/GO films with concentrations of CuS/GO nanotablets of 0, 50, 100, 200, 400, and 800 μ g/mL) was evaluated by CCK-8, live/dead cell staining, and hemolysis test. The angiogenesis was evaluated by cell migration and tube forming test in vitro. Alkaline phosphatase and alizarin red staining were used to evaluate osteogenesis in vitro, and the expression of osteogenic genes was measured by immunofluorescence staining and RT-qPCR. In addition, the bacterial plate counting method and bacteriostatic circle method were used to evaluate the antibacterial activity of films. Results:In the PVA/CMC/GO and PVA/CMC/CuS/GO groups, the surface of the PVA/CMC-based film was smooth and flat whereas the nanosheets composite films were irregularly flaky and convex. The biosafety experiments showed that the PVA/CMC-based film composited with GO or CuS/GO nanosheets at the concentration of 100 μg/mL had good biocompatibility. The results of angiogenesis in vitro showed that the migration ratio of HUVEC cells in the PVA/CMC/CuS/GO group was significantly better than those in the PVA/CMC/GO, PVA/CMC and control groups ( P<0.001). In the experiment of tube forming area and length, the PVA/CMC/CuS/GO group was significantly better than the PVA/CMC/GO, PVA/CMC and control groups ( P<0.001). The osteogenic differentiation in vitro displayed that the alkaline phosphatase and alizarin red staining of MC3T3-E1 cells in the PVA/CMC/CuS/GO group were significantly better than those in the PVA/CMC/GO, PVA/CMC and control groups ( P<0.001). In addition, the fluorescence intensity of immunofluorescence staining in alkaline phosphatase and type Ⅰcollagen on MC3T3-E1 cells, and the mRNA expression levels of osteogenic related genes including alkaline phosphatase, bone morphogenetic protein 2, osteocalcin and osteopontin in the PVA/CMC/CuS/GO group were significantly higher than those in the PVA/CMC/GO, PVA/CMC and control groups ( P<0.001). The antibacterial assay showed that the PVA/CMC/CuS/GO group had a significantly greater antibacterial activity and a significantly larger inhibition zone against Gram-positive bacteria and Gram-negative bacteria than the PVA/CMC/GO, PVA/CMC and control groups ( P< 0.001). Conclusions:PVA/CMC films composited with GO or CuS/GO nanosheets demonstrate ideal biocompatibility and antibacterial properties which promote angiogenesis and osteogenic differentiation in vitro. In particular, antibacterial PVA/CMC/CuS/GO composite films with the coupling function of angiogenesis and osteogenesis are expected to provide a new strategy for infectious bone defects.

Vaccination in patients with inflammatory bowel disease–Asian perspectives: the results of a multinational web-based survey in the 8th Asian Organization for Crohn’s and Colitis meeting

Background/Aims@#Long-term immunosuppressive therapies used to treat inflammatory bowel disease (IBD) are associated with an increased risk of infections, many of which can be prevented by vaccination. We assessed physicians’ current approaches and clinical practices regarding vaccinations for IBD patients in different Asian countries/regions. @*Methods@#An internet-based survey was conducted among members of the Asian Organization for Crohn’s and Colitis from September 2020 to November 2020. The questionnaire consisted of 2 parts covering general opinion on the relevance of vaccinations and clinical practice of vaccination. @*Results@#Overall, 384 Asian medical doctors responded to the survey. The majority of respondents considered it very (57.6%) or sufficiently (39.6%) important to perform vaccinations as recommended by the guidelines. About half of the Asian physicians (52.6%) were usually or always performing vaccinations. The influenza vaccine was the most frequently recommended vaccine for IBD patients. Half of the respondents (51.3%) did not recommend hepatitis A vaccine, especially in China (61.6%) and Japan (93.6%). The diphtheria, tetanus, and pertussis vaccine were never (35.2%) or rarely (29.4%) recommended. @*Conclusions@#The findings of this survey indicated similarities among countries/regions in terms of the current approaches and practices regarding vaccination of IBD patients; however, there are some differences that might reflect each country’s domestic vaccination guidelines and health insurance particularly with certain vaccines in some countries/regions. Although Asian physicians largely recommend vaccination, more awareness among doctors and Asian consensus regarding differences in IBD vaccination among countries/regions may be required.

Guidelines for Ethical Review Entrustment Contract of Life Science and Medical Research Involving Humans / 中国医学伦理学

The passing of ethical review is a necessary conditions and prerequisite for the development of life science and medical research involving humans. At present, some medical and health institutions have no or insufficient ethical review capabilities. The lack of ethical review ability has become a bottleneck restricting the development of life science and medical research involving humans. According to documents such as Opinions on Deepening the Reform of the Review and Approval System and Encouraging the Innovation of Pharmaceutical and Medical Devices, Opinions on Strengthening the Ethical Governance of Science and Technology, institutions can entrust competent institutional ethics review committees or regional ethics review committees in writing to conduct ethical review. Entrustment ethical review provides a viable solution for institutions that need to carry out life science and medical research involving humans but do not have an ethics (review) committee or the ethics (review) committee is not competent to review. To conduct the entrustment ethical review, the entrustment between the principal and the trustee is required. According to The Measures for Ethical Review of Life Sciences and Medical Research Involving Humans, if medical and health institutions and their ethical review committees do not accept the formal entrustment to provide the ethical review opinions for other institutions, the local health authorities at or above the county level will impose administrative penalties and sanctions on the relevant institutions and personnel in accordance with the law. Signing the entrustment ethical review contract, implementing legal compliance entrusted ethical review to protect the rights and interests of the trustee and the principal, and protect the research participants.

Treatment advice of small molecule antiviral drugs for elderly COVID-19 / 中国药理学通报

COVID-19 has been prevalent for three years. The virulence of SARS-CoV-2 is weaken as it mutates continuously. However, elderly patients, especially those with underlying diseases, are still at high risk of developing severe infections. With the continuous study of the molecular structure and pathogenic mechanism of SARS-CoV-2, antiviral drugs for COVID-19 have been successively marketed, and these anti-SARS-CoV-2 drugs can effectively reduce the severe rate and mortality of elderly patients. This article reviews the mechanism, clinical medication regimens, drug interactions and adverse reactions of five small molecule antiviral drugs currently approved for marketing in China, so as to provide advice for the clinical rational use of anti-SARS-CoV-2 in the elderly.

Pyridine degradation characteristics of Rhodococcus sp. LV4 under high salinity conditions / 生物工程学报

Biodegradation of pyridine pollutant by microorganisms is one of the economical and effective methods to solve the environmental pollution of pyridine under high salinity conditions. To this end, screening of microorganisms with pyridine degradation capability and high salinity tolerance is an important prerequisite. In this paper, a salt-resistant pyridine degradation bacterium was isolated from the activated sludge of Shanxi coking wastewater treatment plant, and identified as a bacterium belonging to Rhodococcus on the basis of colony morphology and 16S rDNA gene phylogenetic analysis. Salt tolerance experiment showed that strain LV4 could grow and degrade pyridine with the initial concentration of 500 mg/L completely in 0%-6% saline environment. However, when the salinity was higher than 4%, strain LV4 grew slowly and the degradation time of pyridine by strain LV4 was significantly prolonged. Scanning electron microscopy showed that the cell division of strain LV4 became slower, and more granular extracellular polymeric substance (EPS) was induced to secrete in high salinity environment. When the salinity was not higher than 4%, strain LV4 responded to the high salinity environment mainly through increasing the protein content in EPS. The optimum conditions for pyridine degradation by strain LV4 at 4% salinity were 30 ℃, pH 7.0 and 120 r/min (DO 10.30 mg/L). Under these optimal conditions, strain LV4 could completely degrade pyridine with an initial concentration of 500 mg/L at a maximum rate of (29.10±0.18) mg/(L·h) after 12 h adaptation period, and the total organic carbon (TOC) removal efficiency reached 88.36%, indicating that stain LV4 has a good mineralization effect on pyridine. By analyzing the intermediate products in pyridine degradation process, it was speculated that strain LV4 achieved pyridine ring opening and degradation mainly through two metabolic pathways: pyridine-ring hydroxylation and pyridine-ring hydrogenation. The rapid degradation of pyridine by strain LV4 in high salinity environment indicates its application potential in the pollution control of high salinity pyridine environment.

Research on friction and wear behaviors of silicon-lithium spray coating on zirconia ceramics / 北京大学学报(医学版)

OBJECTIVE@#To study microstructure, friction and wear behaviors of silicon-lithium spray coating on the surface of zirconia ceramics and to preliminarily evaluate its esthetic so as to provide support and guidance for the clinical application.@*METHODS@#Zirconia ceramic specimens were randomly divided into three groups: coating group (two subgroups), polishing group (two subgroups), and glazing group (four subgroups), with 10 samples in each subgroup. The two subgroups of coating group were the zirconia ceramics with the untreated and preliminary polishing surfaces sprayed with silicon-lithium coating, respectively. The two subgroups of polishing group were preliminary polishing and fine polishing of zirconia ceramics, respectively. The four subgroups of glazing group were preliminarily polished zirconia ceramics glazed with Biomic and Stain/Glaze products, respectively; and untreated zirconia ceramics glazed with Biomic and Stain/Glaze products, respectively. The above 8 subgroups of zirconia ceramic specimens were used as friction pairs with 80 steatite ceramics for 50 000 chewing cycles under 50 N vertical load and artificial saliva lubrication using chewing simulation. Scanning electron microscope was used to observe the microstructure of the surface and section of the coating group, and the thickness of the coating and glazing were measured. The linear roughness of the coating and polishing groups was mea-sured using a laser confocal scanning microscope. Vickers hardness was measured using a microhardness tester and the esthetic of zirconia ceramic full crown sprayed with silicon-lithium coating was preliminarily evaluated. White light interferometer was used to measure the width, the maximum depth and the volume of the wear scars of each group, and the wear depth of steatite ceramics and wear rate of zirconia ceramic specimens were calculated. Kruskal-Wallis nonparametric test and Dunn's multiple comparisons test were used to analyze the wear depth of each group (α=0.05).@*RESULTS@#The microstructures of the silica-lithium spray coatings on the untreated and preliminarily polished zirconia ceramic surfaces showed the protruding defects, and the line roughness of coating group was larger than that of the polishing group. The median thickness of the silica-lithium spray coating on the preliminarily polished zirconia ceramic was 13.0 μm (interquartile range, IQR: 11.6, 17.9), while that of the silica-lithium spray coating on the untreated zirconia ceramic was 4.4 μm (IQR: 4.1, 4.7). The Vickers hardness and wear rate of the coating group were between the polishing group and the glazing group. The wear depths of the wear scars of steatite ceramics were the glazing group, coating group, and polishing group in descending order, and there was statistically significant difference between glazing and polishing groups (P < 0.05). With the increase of polishing procedure, the wear depth of steatite ceramics decreased in each subgroups. The orders of maximum depth and volume of wear scars of zirconia ceramic were the glazing group, coating group, and polishing group in descending order, and there was statistically significant difference in the maximum depth of wear scars between glazing and polishing groups (P < 0.05).@*CONCLUSION@#The silica-lithium spray coating on the zirconia ceramic, can be used as a new method for zirconia ceramic surface treatment, because it can increase the esthetic of zirconia ceramics compared with polishing and reduce the wear of steatite ceramics compared with glazing.

Effect of orbital decompression on choroidal thickness in patients with thyroid associated ophthalmopathy / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To investigate the effect of orbital decompression on the central macular choroidal thickness(CMCT)in patients with thyroid-associated ophthalmopathy(TAO).METHOD: Prospective clinical studies. A total of 29 TAO patients(42 eyes)treated in our department from January 2021 to January 2022 were analyzed, and they were divided into 20 cases(30 eyes)in the moderate and severe group and 9 cases(12 eyes)in the extremely severe group. Both groups of patients received orbital decompression, and the changes of CMCT, visual acuity, intraocular pressure, exophthalmos, and clinical activity score(CAS)at 3 and 6mo before and after surgery were compared between the two groups.RESULTS: All patients completed follow-up. The CMCT, exophthalmos, intraocular pressure, and CAS of the extremely severe group at 3 and 6mo were 355.13±15.59 and 339.61±13.17μm, 19.33±2.23 and 17.83±1.70mm, 18.86±3.05 and 18.09±1.37mmHg, 3.75±0.87 and 2.42±1.00 points, respectively. The moderate and severe group was 325.00±10.48 and 321.04±11.34μm, 16.07±1.74 and 15.6±1.98mm, 16.65±2.04 and 16.03±2.3mmHg, 1.50±0.51 and 1.43±0.50 points, and there was differences with those before operation(extremely severe group: 396.46±17.61μm, 22.00±2.3mm, 21.85±2.82mmHg, 5.33±1.44 points; moderate and severe group: 335.77±11.60μm, 19.07±1.84mm, 18.89±3.06mmHg, 1.63±0.49 points; all P&#x003C;0.001). The best corrected visual acuity(LogMAR)before surgery was 0.64±0.22 in the extremely severe group, and 0.43±0.20 and 0.34±0.15 at 3 and 6mo after operation, respectively, which were different from those before surgery(all P&#x003C;0.001)CONCLUSION: Orbital decompression can effectively reduce CMCT, intraocular pressure and exophthalmos in TAO patients, relieve orbital vein stasis, and effectively improve vision and reduce mobility in patients with extremely severe disease.

Role of dendritic cells in MYD88-mediated immune recognition and osteoinduction initiated by the implantation of biomaterials / 国际口腔科学杂志·英文版

Bone substitute material implantation has become an important treatment strategy for the repair of oral and maxillofacial bone defects. Recent studies have shown that appropriate inflammatory and immune cells are essential factors in the process of osteoinduction of bone substitute materials. Previous studies have mainly focused on innate immune cells such as macrophages. In our previous work, we found that T lymphocytes, as adaptive immune cells, are also essential in the osteoinduction procedure. As the most important antigen-presenting cell, whether dendritic cells (DCs) can recognize non-antigen biomaterials and participate in osteoinduction was still unclear. In this study, we found that surgical trauma associated with materials implantation induces necrocytosis, and this causes the release of high mobility group protein-1 (HMGB1), which is adsorbed on the surface of bone substitute materials. Subsequently, HMGB1-adsorbed materials were recognized by the TLR4-MYD88-NFκB signal axis of dendritic cells, and the inflammatory response was activated. Finally, activated DCs release regeneration-related chemokines, recruit mesenchymal stem cells, and initiate the osteoinduction process. This study sheds light on the immune-regeneration process after bone substitute materials implantation, points out a potential direction for the development of bone substitute materials, and provides guidance for the development of clinical surgical methods.

Establishment of HPLC fingerprints and determination of eleven constituents for Qiangxin Mixture / 中成药

AIM To establish the HPLC fingerprints for Qiangxin Mixture,and to determine the contents of quercetin-3-O-β-D glucose 7-O-β-D gentil disglycoside(QGG),sinarin thiocyanate,erucinic acid,macrocetin,calycosin-7-glucoside,plananthine D,calycosin,baicalin,pilonidin,atracolactone Ⅲ and methylophiopogon dihydrogen isoflavone B.METHODS The analysis of methanol extract of this drug was performed on a 40℃thermostatic Agilent Eclipse XDB-C18 column(4.6 mm×250 mm,5 μm),with the mobile phase comprising of acetonitrile-0.01 mol/L phosphoric acid flowing at 1.0 mL/min in a gradient elution manner,and the detection wavelength was set at 230 nm.RESULTS There were twenty common peaks in the fingerprints for fifteen batches of samples with the similarities of more than 0.930.Eleven constituents showed good linear relationships within their own ranges(r≥0.999 1),whose average recoveries were 98.47%-102.85%with the RSDs of 0.76%-1.74%.CONCLUSION This accurate and stable method can be used for the quality control of Qiangxin Mixture.

Independent innovation research, development and transformation of precise bionic repair technology for oral prosthesis / 北京大学学报(医学版)

According to the fourth national oral health epidemiological survey report (2018), billions of teeth are lost or missing in China, inducing chewing dysfunction, which is necessary to build physiological function using restorations. Digital technology improves the efficiency and accuracy of oral restoration, with the application of three-dimensional scans, computer-aided design (CAD), computer-aided manufacturing (CAM), bionic material design and so on. However, the basic research and product development of digital technology in China lack international competitiveness, with related products basically relying on imports, including denture 3D design software, 3D oral printers, and digitally processed materials. To overcome these difficulties, from 2001, Yuchun Sun's team, from Peking University School and Hospital of Stomatology, developed a series of studies in artificial intelligence design and precision bionics manufacturing of complex oral prostheses. The research included artificial intelligence design technology for complex oral prostheses, 3D printing systems for oral medicine, biomimetic laminated zirconia materials and innovative application of digital prosthetics in clinical practice. The research from 2001 to 2007 was completed under the guidance of Prof. Peijun Lv and Prof. Yong Wang. Under the support of the National Natural Science Foundation of China, the National Science and Technology Support Program, National High-Tech R & D Program (863 Program) and Beijing Training Project for the Leading Talents in S & T, Yuchun Sun's team published over 200 papers in the relevant field, authorized 49 national invention patents and 1 U.S. invention patent and issued 2 national standards. It also developed 8 kinds of core technology products in digital oral prostheses and 3 kinds of clinical diagnosis and treatment programs, which significantly improved the design efficiency of complex oral prostheses, the fabrication accuracy of metal prostheses and the bionic performance of ceramic materials. Compared with similar international technologies, the program doubled the efficiency of bionic design and manufacturing accuracy and reduced the difficulty of diagnosis and cost of treatment and application by 50%, with the key indicators of those products reaching the international leading level. This program not only helped to realize precision, intelligence and efficiency during prostheses but also provided functional and aesthetic matches for patients after prostheses. The program was rewarded with the First Technical Innovation Prize of the Beijing Science and Technology Awards (2020), Gold Medal of Medical Research Group in the First Medical Science and Technology Innovation Competition of National Health Commission of the People's Republic of China (2020) and Best Creative Award in the First Translational Medical Innovation Competition of Capital (2017). This paper is a review of the current situation of artificial intelligence design and precision bionics manufacturing of complex oral prosthesis.

Finite element analyses of retention of removable partial denture circumferential clasps manufactured by selective laser melting / 北京大学学报(医学版)

OBJECTIVE@#To compare the retentions of different designs of cobalt-chromium (Co-Cr), pure titanium (CP Ti), and titanium alloy (Ti-6Al-4V) removable partial denture (RPD) circumferential clasps manufactured by selective laser melting (SLM) and to analyze the stress distribution of these clasps during the removal from abutment teeth.@*METHODS@#Clasps with clasp arm size A (1.9 mm width/1.1 mm thickness at the body and 0.8-taper) or B (1.2 times A) and 0.25 mm or 0.50 mm undercut engagement were modeled on a prepared first premolar die, named as designs A1, A2, A3, and A4, respectively. The density and elastic modulus of SLM-built Co-Cr, CP Ti, and Ti-6Al-4V were measured and given to different groups of clasps. The density, elastic modulus, and Poisson ' s ratio of enamel were given to the die. The control group was the cast Co-Cr clasp with design A1, to which the density and elastic modulus of cast Co-Cr alloy were given. The Poisson's ratio of all metals was 0.33. The initial 5 N dislodging force was applied, and the maximum displacement of the clasp along the insertion path was computed. The load was reapplied with an increment of 5 N than in the last simulation until the clasp was completely dislodged. The retentive force range of different groups of clasps was obtained. The retentive forces of the SLM-built Co-Cr, CP Ti, and Ti-6Al-4V clasps with equivalent computed retentive force range to the control group were validated through the insertion/removal experiment. The von Mises stress distributions of these three groups of SLM-built clasps under 15 N loads were analyzed.@*RESULTS@#SLM-built Co-Cr, CP Ti, and Ti-6Al-4V clasps with designs B1 or B2, and Co-Cr clasps with design A2 had higher retentive forces than those of the control group. SLM-built CP Ti and Ti-6Al-4V clasps with design A1 had lower retentive forces than those of the control group. SLM-built Co-Cr clasp with design A1 and SLM-built CP Ti and Ti-6Al-4V clasps with design A2 had equivalent retentive forces to those of the control group. The insertion/removal experiment showed that the measured retentive forces of these three groups of SLM-built clasps were (21.57±5.41) N, (19.75±4.47) N, and (19.32±2.04) N, respectively. No statistically significant measured retentive force difference was found among these three groups of SLM-built clasps (P>0.05). The maximum von Mises stress of these three groups of SLM-built clasps exceeded their responding yield strength except for the Ti-6Al-4V one.@*CONCLUSION@#SLM-built Co-Cr circumferential clasps had higher retention than CP Ti and Ti-6Al-4V ones with the same clasp arm size and undercut engagement. The retention of SLM-built circumferential clasps could be adjusted by changing the undercut engagement and clasp arm size. If SLM-built circumferential clasps are used in clinical practice, the Ti-6Al-4V clasp with clasp arm size A and 0.50 mm undercut engagement is recommended considering the long-term use of RPD in the patient's mouth.