BACKGROUND:The osteogenic differentiation of mesenchymal stem cells is regulated by a variety of molecules.Long non-coding RNA(lncRNA)has attracted much attention because they can participate in regulating a variety of biological processes,but the regulatory role of lncRNA on osteogenic differentiation of mesenchymal stem cells has not been fully explored. OBJECTIVE:To explore the effect of lncRNA Gm16104 on osteogenic differentiation of C3H10T1/2 mesenchymal stem cells. METHODS:The C3H10T1/2 mesenchymal stem cells were induced into osteogenic differentiation by bone morphogenetic protein-2.Alkaline phosphatase staining was performed to identify the osteogenic differentiation of the cells 5 days after osteogenic induction.Expression levels of alkaline phosphatase and lncRNA Gm16104 were detected by qRT-PCR after 0,1,3,and 5 days of osteogenic differentiation.After transfection of the overexpression plasmid of pcDNA-Gm16104,the osteogenic differentiation was identified by alkaline phosphatase staining and qRT-PCR 4 days after osteogenic induction.The expression levels of osteogenesis-related signalling pathway proteins were detected by western blot assay. RESULTS AND CONCLUSION:(1)After 5 days of osteogenic induction,alkaline phosphatase activity was significantly increased.(2)Compared with 0 days,expression levels of the osteogenic marker gene alkaline phosphatase increased and expression levels of Gm16104 decreased after 1,3,and 5 days of osteogenic induction.(3)Transfection of C3H10T1/2 cells with pcDNA-Gm16104 plasmid significantly increased the expression level of Gm16104.(4)Overexpression of Gm16104 inhibited alkaline phosphatase activity,the expression levels of the osteogenic marker gene alkaline phosphatase and the osteogenesis-related transcription factor Osterix.(5)Overexpression of Gm16104 inhibited phosphorylated protein expression of PI3K and Akt.(6)The above results suggest that overexpression of Gm16104 may inhibit osteogenic differentiation of C3H10T1/2 mesenchymal stem cells through the PI3K/Akt signaling pathway.

BACKGROUND:There is currently no anatomic locking plate suitable for the anteromedial platform,so the medial locking plate of the tibial plateau is usually placed forward to fix anteromedial compression fractures caused by hyperextension varus injury.Due to the inability of the locking screw to achieve vertical fixation of the fracture line,coupled with the influence of the patellar ligament,the clinical results are still unsatisfactory. OBJECTIVE:To compare the biomechanical performance of a new type of plate with traditional internal fixation methods in treating hyperextension varus tibial plateau fractures through finite element analysis. METHODS:CT data of 20 cases of hyperextension varus tibial plateau fractures were collected,and their morphological characteristics,such as medial posterior tibial slope,the medial articular fracture angle,surface area,and anterior cortical height were measured.A 24-year-old male volunteer with a height of 175 cm and a weight of 65 kg was selected,and his tibial CT data were imported into Mimics 21.0 software to generate a 3D model.Then,internal fixation models were imported into SolidWorks 2017 software.New type of plate,medial locking plate,posterior medial locking plate,and 6.5 mm hollow screws fixed data models were established based on the measured morphological data.Ansys 17.0 software was used to load stress on the four fixation models and compare their biomechanical performance. RESULTS AND CONCLUSION:(1)With the increase of axial load,the peak stresses of different internal fixation models approximately increased proportionally.At 500 N,the peak stress values were as follows:screw group(6.973 7 MPa)

Objective To investigate the epidemiological characteristics of local visceral leishmaniasis in Beijing Municipality from 2021 to 2023, so as to provide insights into formulation of the visceral leishmaniasis control strategy. Methods Epidemiological data of visceral leishmaniasis cases reported in Beijing Municipality from 2021 to 2023 were collected from the National Health Informatization Disease Prevention and Control Information System, and the epidemiological characteristics of local visceral leishmaniasis cases were analyzed using a descriptive epidemiological method. In November 2021 and 2023, 50 to 100 permanent residents were voluntarily selected within a 100 meter radius of sites where patients lived or acquired Leishmania infections, and venous blood was sampled for anti-Leishmania antibody testing. Venous blood was sampled from dogs for anti-Leishmania antibody testing in natural villages where patients lived or acquired Leishmania infections, or in districts where Leishmania infected dogs were reported. In addition, sandflies were captured with CO₂ mosquito traps and fine mesh nets in natural villages where patients lived or acquired Leishmania infections from May to September, 2021 and 2023, for sandfly species identification. Results A total of 4 local visceral leishmaniasis cases were reported in Beijing Municipality from 2021 to 2023, with ages of 2 to 77 years, and acquiring Leishmania infections in Mentougou District (2 cases), Changping District (1 case), and Yanqing District (1 case). The anti-Leishmania antibody testing was all negative in 73 human blood samples and the sero-prevalence of anti-Leishmania antibody was 25.00% in 36 venous blood samples from domestic dogs in 2021, with a total of 4 520 Phlebotomus chinensis captured. The sero-prevalence of anti-Leishmania antibody was 0.51% in 198 human blood samples and 13.58% in 243 venous blood samples from domestic dogs in 2023, with 16.10%, 25.00%, 17.78% and 3.13% sero-prevalence in dogs sampled from Mentougou District, Changping District, Yanqing District and Haidian District, respectively (P = 0.011), while a total of 1 712 Ph. chinensis were captured, including 1 421 female sandflies (86.54%). Conclusions The prevalence of local visceral leishmaniasis was low in Beijing Municipality from 2021 to 2023; however, there is a risk of further spread in the epidemic foci. Intensified visceral leishmaniasis surveillance and control is recommended.

Objective To investigate the effect and mechanism of Liraglutide on the spatial learning and memory function in type 2 diabetes mellitus(T2DM)rats.Methods SD rats were randomly divided into control group(NC),T2DM group(T2DM)and Liraglutide group(Lir).The ability of learning and memory was evaluated by Morris water maze method.Apoptosis of hippocampal neuron was tested by TUNEL staining.The mRNA expression levels of inflammatory cytokines TNF-α,IL-1β and IL-6 were measured by real time-PCR.The protein expressions of heme oxygenase-1(HO-1),NADPH oxidase 1(NOX1),protein B-cell lymphoma-2(Bcl-2)and Bcl2-associated X(Bax)in hippocampus tissues were determined by Western blot.Results Compared with T2DM group,the percent time in target quadrant was increased in Lir group(P<0.05),while the escape latency of day 3 to day 5 was significantly decreased in Lir group(P<0.05).The apoptosis of hippocampal neurons was reduced in Lir group,and the morphological changes,including hyperchromatic cytoplasm and karyopyknosis were alleviated.Compared with T2DM group,MDA content,mRNA level of TNF-α,IL-1β and IL-6,and protein expression of NOX1 and Bax were decreased(P<0.05),while T-AOC,SOD,HO-1 and Bcl-2 protein expression were increased in Lir group(P<0.05).Conclusions Liraglutide ameliorates diabetes-related learning and memory impairment by regulating antioxidant,anti-inflammatory and anti-apoptotic effects in hippocampus.

Chiral drugs are closely related to the safety and effectiveness of drug use.Most dihydropyridine drugs have chiral carbon atoms,which are used as racemes and produce stereoselective disposal characteristics after entering the body,and may affect the safety and effectiveness of drugs.Therefore,based on the chiral resolution and pharmacokinetic characteristics of this class of drugs,the selection rules of chiral HPLC and CE methods and in vivo analysis applications of this class of drugs in recent years were reviewed.The stereoselective pharmacokinetics of this class of drugs were listed and compared.It was found that some of these drugs had obvious differences in stereoselective pharmacokinetics,and the pharmacokinetics and toxicity in vivo were also different.

Objective To investigate the mediating effect of coping styles in the relationship between psychological resilience and psychological stress among ocean-going seafarers. Methods A total of 502 ocean-going seafarers were selected as the study subjects using the convenience sampling method. Psychological resilience, psychological stress, and coping styles were assessed using the Connor-Davidson Resilience Scale, Military Psychological Stress Self-Assessment Scale and Simplified Coping Style Questionnaire. The structural equation modeling was performed using Amos 21.0 software to verify the mediating effect. Results The median and the 25th and 75th percentiles scores of psychological resilience, psychological stress, positive coping and negative coping among ocean-going sailors were 75.0 (58.0, 90.0), 47.8 (40.6, 55.6), 2.0 (1.6, 2.7), and 1.0 (0.5, 1.6) points, respectively. The scores of psychological resilience were negatively correlated with those of psychological stress and negative coping styles [Spearman correlation coefficients (r_S) were -0.57 and -0.50, respectively, both P<0.01]. The scores of psychological resilience were positively correlated with those of positive coping styles (r_S=0.57, P<0.01). The score of psychological stress was positively correlated with the score of negative coping style (r_S=0.50, P<0.01) and negatively correlated with the score of positive coping style (r_S=-0.44, P<0.01). The results of the structural equation model showed that psychological resilience directly affected psychological stress, with the direct effect accounting for 37.7% of the total effect. Psychological resilience indirectly affected psychological stress via positive and negative coping styles, with a total mediating effect accounting for 62.3% of the total effect, with the positive coping style and negative coping style accounting for 51.7% and 48.3% of the total mediating effect, respectively. Conclusion Coping styles play a parallel multiple mediating role in the relationship between psychological resilience and psychological stress among ocean-going seafarers.

Accurate classification of the acetabular injuries and appropriate treatment plan are great challenges for orthopedic surgeons because of the irregular anatomical structure of the acetabulum and aggregation of important vessels and nerves around it. Letournel-Judet classification system has been widely applied to classify acetabular fractures. However, there are several limitations, including incomplete inclusion of fracture types, difficulty in understanding and insufficient guidance for surgical treatment, etc. Serious complications such as traumatic arthritis are common due to wrong classification and diagnosis and improper selection of surgical strategy, which brings a heavy burden to the society and families. Three-column classification, based on anatomic characteristics, has advantages of containing more fracture types and being easy to understand, etc. To solve the problems existing in the diagnosis and treatment process based on Letournel-Judet classification, achieve accurate diagnosis and treatment of patients with acetabular fractures, and obtain satisfactory prognosis, the Orthopedic Trauma Emergency Center of Third Hospital of Hebei Medical University and the Trauma Orthopedic Branch of the Chinese Orthopedic Association organized experts from relevant fields to formulate the Expert consensus on the accurate diagnosis and treatment of acetabular fractures based on three-column classification ( version 2023) in terms of principles of evidence-based medicine. Based on the three-column classification, 15 recommendations were proposed, covering the diagnosis, treatment, complication prevention and management, etc, so as to provide reference for accurate diagnosis and treatment of acetabular fractures.

Therapeutic drug monitoring(TDM)has played an important role in clinical medicine for precise dosing.Currently,chromatographic technology and immunoassay detection are widely used in TDM and have met most of the needs of clinical drug therapy.However,some problems still exist in practical appli-cations,such as complicated operation and the influence of endogenous substances.Surface plasmon resonance(SPR)has been applied to detect the concentrations of small molecules,including pesticide residues in crops and antibiotics in milk,which indicates its potential for in vivo drug detection.In this study,a new SPR-based biosensor for detecting chloramphenicol(CAP)in blood samples was developed and validated using methodological verification,including precision,accuracy,matrix effect,and extraction recovery rate,and compared with the classic ultra-performance liquid chromatography-ultraviolet(UPLC-UV)method.The detection range of SPR was 0.1-50 ng/mL and the limit of detec-tion was 0.099±0.023 ng/mL,which was lower than that of UPLC-UV.The intra-day and inter-day ac-curacies of SPR were 98％-114％and 110％-122％,which met the analysis requirement.The results show that the SPR biosensor is identical to UPLC-UV in the detection of CAP in rat blood samples;moreover,the SPR biosensor has better sensitivity.Therefore,the present study shows that SPR technology can be used for the detection of small molecules in the blood samples and has the potential to become a method for therapeutic drug monitoring.

Objective: To explore the spatial-temporal distribution and epidemic characteristics of hemorrhagic fever with renal syndrome (HFRS) in Hebei province from 2005 to 2016. Methods: Records of HFRS cases reported from each county in Hebei during January 2005 to December 2016 were collected from National Notifiable Disease Surveillance System (NNDSS). Global and local spatial association statistics were used to measure the spatial autocorrelation and software GeoDa 1.2.0. Software SaTScan 9.4.1 was used to analyze spatiotemporal clusters. Software ArcGIS 10.2 was used to visualize the yearly scan results. Results: In Hebei province, a total of 8 437 human HFRS cases reported from 170 counties with an annual incidence rate of 0.99/100 000 population during 2005-2016. The peak incidence season was spring. Global spatial autocorrelation analysis on the incidence of HFRS at county-level showed that the value of Moran’s I were all above 0 (P<0.05), indicating that the significant spatial cluster. The result of local indicators on spatial association (LISA) analysis revealed that identified hot spots were mainly in northeastern area, while cold spots were found in some counties of central and southern areas. Spatial-temporal scan detected that the primary cluster of HFRS incidence was mainly distributed in Qinhuangdao city and Tangshan city, including 11 counties (city/district): Beidaihe district, Haigang district, Funing district, Shanhaiguan district, Changli county, Lulong county and Qinglong Manchu autonomous county in Qinhuangdao city, and Qian’an city, Laoting county, Luanzhou city and Luannan county in Tangshan city (RR=39.64, P<0.001), during January-July in 2005. Conclusions There were significant spatial-temporal cluster of HFRS in Hebei from 2005 to 2016. The cluster areas of HFRS were mainly in northeastern Hebei, it is necessary to strengthen the prevention and control programs of HFRS in these areas.

Objective To assess the influence of metabolic syndrome(MS)on the success rate of catheter ablation for the treatment of atrial fibrillation (AF)in the elderly. Methods A retrospective study included a total of 221 aged patients with AF who underwent AF ablation for the first time. The patients were divided into two groups :an MS group(n＝72)and a control group(without MS)(n＝149) . The MS group had a mean age of (67.1 ± 5.2) years ;the control group had a mean age of (68.3 ± 5.7) years. Forty-six patients in the MS group and 105 patients in the control group experienced paroxysmal atrial fibrillation. Prognoses in two groups were compared at the end of the follow-up. Results At the end of the follow-up ,the success rates of the procedure in the MS group and the control group were 37.5%(n ＝ 27)and 51.7%(n ＝ 77) ,respectively (χ2＝ 3.917 ,P ＝ 0.049) .Recurrence happened in 19 patients of the MS group and 28 patients of the control group ,and they underwent a repeat ablation. The overall success rates after the last ablation in the two groups were 51.4%(n＝37)and 65.8%(n＝98) ,respectively (χ2＝4.224 ,P＝0.034).In the multivariable model adjusted for risk factors ,MS(HR＝1.42 ,95% CI :1.11-1.64 ,P＝0.033)and left atrial diameter(HR＝ 1.83 ,95% CI :1.27-3.19 , P ＝ 0.017 ) were independent predictors for recurrence. Conclusions MS can affect the success rate of catheter ablation for AF in elderly patients and the effect remains even after the procedures are repeated