BACKGROUND: The treatment principle, long-term therapeutic effects, and complications of percutaneous kyphoplasty are closely related to blomechanlcs. Its blomechanlcs have attracted wide attention. OBJECTIVE: To establish a virtual digital evaluation system for biomechanical changes and bone cement leakage after percutaneous kyphoplasty and bone cement injection. METHODS: Percutaneous kyphoplasty with bone cement injection was performed based on previously established three-dimensional model of L3-L5. The model was processed using the software Abaqus2016 for finite element analysis. The effects of bone cement injection model, injection pressure, and injection volume on the stress of fractured L4 vertebral endplate were analyzed. RESULTS AND CONCLUSION: (1) After simulated percutaneous kyphoplasty with bone cement injection, the stress of L4 fractured vertebral endplate decreased significantly under the partial pressure of cement. Different injection methods had no significant effect on the stress of fractured L4 vertebral endplate (P > 0.05), but bilateral injection made the distribution of bone cement more uniform and produced the best effect. (2) Different injection pressures had no significant effect on the stress of fractured L4 vertebral endplate (P > 0.05), but with the increase of injection pressure, the distribution of bone cement was more dispersed and leakage was more likely to occur. (3) With increase in bone cement injection dose, the stress of fractured L4 vertebral endplate gradually decreased (P < 0.05). The physiological stiffness of the vertebral body could not be restored when 2 mL of bone cement was injected. The distribution of bone cement was more concentrated when 4 mL of bone cement was injected. The breakdown point was reached when 8 mL of bone cement was injected. (4) After injection of bone cement, the upper endplate of the lower vertebral body was more prone to suffer from fracture than the lower endplate of the upper vertebral body. (5) These results suggest that the stress of L4 vertebral endplate shifted obviously after simulated surgery compared with before surgery, that is, the stress of L4 upper endplate increased and that of L4 lower endplate decreased. Different injection methods had little effect on the surgical results, but the distribution of bone cement injected bilaterally was more uniform, which reduced the incidences of re-fracture and collapse. Lower injection pressure could reduce the risk of cement leakage after surgery. Injection of 4 mL bone cement can restore good stiffness and physiological curvature of the diseased vertebra, without reaching the yield point or causing refracture.

Two simple and sensitive high performance liquid chromatography–tandem mass spectrometry (HPLC–MS/MS) methods were developed and validated for the determination of fenticonazole in human plasma after percutaneous and intravaginal administration. Mifepristone was used as an internal standard (IS), and simple protein precipitation by acetonitrile containing 2%acetic acid was utilized for extracting the analytes from the plasma samples. Chromatographic separation was performed on a Kinetex XB-C18 column. The quantitation was performed by a mass spectrometer equipped with an electrospray ionization source in multiple reactions monitoring (MRM) positive ion mode using precursor-to-product ion transitions of m/z 455.2–199.1 for fenticonazole and m/z 430.2–372.3 for mifepristone. The validated linear ranges of fenticonazole were 5–1000 pg/mL and 0.1–20 ng/mL in plasma for the methods A and B, respectively. For the two methods, the accuracy data ranged from 85% to 115%, the intra- and inter-batch precision data were less than 15%, the recovery data were more than 90%, and no matrix interference was observed. The methods A and B were successfully validated and applied to the pharmacokinetic studies of fenticonazole gel in Chinese healthy volunteers after percutaneous and intravaginal administration, respectively.

Objective To evaluate the feasibility of the diagnosis of the early immunologic rejection after xeno-islet transplantation by MR imaging enhanced with superparamagnetic iron oxide(SPIO)marking CD4+T cell antibody.Methods Two thousand neonatal porcine islets(NPI)were transplanted under the left renal capsule of BALB/C nude mice.When the grafts could be observed bv MRI.107 human PBMC was intraperitoneal injected to nude mouse models to reconstitute the human immunologic system,20 mice were reconstituted.Before and 3,7,14 days after reconstitution of human immunologic system on BALB/C nude mice,MRI imaging Was performed half an hour after intravenous injection of nano-immunomagnetic beads via vena caudalis to observe the grafts'MRI signal.BALB/C nude mice were sacrificed after MRI scanning immediately,the histopathologic examination was assessed on grafts,the results were compared with MRI results.And calculate the sensitivity,specificity,Youden index number and coincidence of the MRI for immunologic rejection.Results Grafts can be observed bv MRI 3 weeks after islet cell transplantation (before immunologic rejection modeling),there is no abnormal MRI signal detected in nude mice'graft region after mierobeads injected.Seven days after building of immunologic rejection model,MRI hypo-signal in graft site is shown in the T2 WI sequence after nano-bioprober injected.Histopathologic assessments were employed on grafts in nude mice immediately(HE and immunohistochemistry staining),the results shown that there are a lot of T lymphocyts infiltrated in graft region.implying the occurrence of immunologic rejection.And the sensitivity,specificity,Youden index number and coincidence is:(72.96±0.24)%,100%,0.73±0.24,(88.46±0.13)%respectively.The correct Kappa between the MRI and the imunohistochemistry staining was 0.76.Conclusion The cellular immunological rejection to xeno-islet grarts can be assessed with nano-bioprobe with anti-CD4+ antibody MR imaging,real time,and noninvasively.

Objective:To explore the role ofDNA methyltransferase 1 (DNMT1) in mouse skin aging.Methods:Epidermal conditional K14 Cre-mediated DNA methyltransferase 1 (DNMT1) knockout mice (Mut group,n=4) and the littermate normal mice with the same age (WT group) n=4) were used in this study.HE staining was used to detect the pathological changes of skin;the changes of number in the dermal elastic fibers were detected by Gomori aldehyde fuchsin staining,the number of 5-bromo-2-deoxyuridine (BrdU)-labeled transit amplifying cells (TAC) in epidermis were detected by immunohistochemical staining;the number of chlorodeoxyuridine (CldU)-labelretaining cells (LRC) in epidermis were detected by immunofluorescent staining.Results:Compared with the WT group,the skin showed premature aging symptoms in the Mut group concomitant with the decreased epidermal thickness as well as the number of dermal collagen fibers,while the increased dermal elastic fiber fracture.Compared with the WT group,the number of TAC in the epidermis was significantly increased (P＜0.05),and the number of LRC was significantly decreased (P＜0.05) in the Mut group.Conclusion:The phenotype of skin premature aging in epidermal stem cell conditional DNMT1-knockout mice suggests an important role of DNMT 1 in skin aging.

Objective:To investigate the relationship between protein-energy wasting (PEW) and parathyroid hormone (PTH) levels in patients undergoing maintenance hemodialysis.Methods:A cross-sectional study was conducted to enroll 150 adult patients undergoing maintenance hemodialysis at The Third Affiliated Hospital of Anhui Medical University from January 2022 to May 2023. These patients were categorized into four groups based on their PTH levels: low PTH group (< 150 ng/L), standard PTH group (150-300 ng/L), very high PTH group (300-600 ng/L), and extreme high PTH group (> 600 ng/L). The diagnosis of PEW was determined using the diagnostic criteria proposed by the International Society of Renal Nutrition and Metabolism (ISRNM). Logistic regression analysis was performed to investigate the association between PEW and PTH levels.Results:Among the 150 patients undergoing maintenance dialysis, 52 (34.7%) were diagnosed with PEW. The prevalence of PEW was significantly higher in the low PTH group compared with the standard, very high, and extreme high PTH groups ( χ2 = 20.64, all P < 0.05). Univariate logistic regression analysis revealed a strong association between low PTH levels ( OR = 13.810, 95% CI: 2.907-65.603, P = 0.001) and an increased risk of PEW. The risk of PEW in the low PTH group was 13.810 times higher than that in the extreme high PTH group. Multivariate logistic regression analysis further confirmed that low PTH levels ( OR = 19.891, 95% CI: 1.810-218.620, P = 0.014) and low C-reactive protein levels ( OR = 1.056, 95% CI: 1.015-1.099, P = 0.007) were independently associated with an increased risk of PEW. Higher hemoglobin levels ( OR = 0.959, 95% CI: 0.931-0.988, P = 0.005) and a larger middle upper arm circumference ( OR = 0.544, 95% CI: 0.338-0.875, P = 0.012) were independently associated with a reduced risk of PEW. The risk of PEW in the low PTH group was 19.891 times higher than that in the extreme high PTH group. However, there was no significant difference in the risk of PEW in the standard and very high PTH groups compared with the extreme high PTH group (both P > 0.05). Conclusion:The risk of PEW is markedly elevated in patients with low PTH levels, emphasizing the importance of clinical attention to the prevention and treatment of low PTH levels. Addressing this issue may hold great value in reducing the risk of PEW.

Objective: To understand the level of nutritional literacy and its influencing factors among schoolage children in grades 4-9 in Guizhou Province, and to explore the relationship between nutritional literacy and physical health, so as to provide reference for improving nutritional literacy and physical health of schoolage children. Methods: Using multistage stratified cluster sampling method, 1 155 schoolage children in grades 4-6 in elementary school and grades 7-9 in secondary schools in three prefectural and municipal cities of Guizhou Province (Zunyi, Tongren, and Bijie) were sampled from February to July 2023, and were surveyed for nutritional literacy by using the "Food and Nutritional Literacy Questionnaire for Chinese Schoolage Children", and their physical health data (data on body measurement indicators, such as height, weight, lung capacity, and vertical jump) were obtained from the physical health surveillance platform. Pearson correlation analysis and binary Logistic regression modeling were used to explore the association between nutritional literacy and physical health. Results: The nutritional literacy score of the study population was (63.50±8.63), and the scores of each level of nutritional literacy in descending order were interactivity (66.09±13.99), functionality (63.84±8.80), and criticism (61.15±14.65); and the scores of cognitive domain of nutritional literacy, and skill domain were (64.71±10.77) (62.97±9.21); food selection, food preparation, and food intake dimension scores were (64.68±13.52) (56.39±12.17) (63.63±10.04), respectively. Differences in the total nutritional literacy scores of schoolaged children who were only children or not, by gender, ethnicity, grade level, primary caregiver, primary caregivers education, and family economic situation were statistically significant (t/F=2.88, -3.28, 5.02, 18.32, 4.67, 32.47, 32.53, P<0.05); the physical health pass rate was 85.8%, and the mean scores of the total physical health score, physical form, physical function, and physical fitness dimensions were (71.86±10.52) (93.29±12.06) (72.12±14.42) (67.26±13.13), respectively; after controlling for confounders, the nutritional literacy scores were positively correlated with physical health (OR=1.03, 95%CI=1.01-1.05, P<0.05). Conclusion Nutritional literacy scores of schoolage children in grades 4-9 in Guizhou Province are low, and there is a positive correlation between nutritional literacy and physical health in this school age children.

As society advances and living standards improve, there is a growing emphasis on the impact of mental health on illness and the interaction between them. Diabetes mellitus is one of the most common underlying diseases, and it is often accompanied by depression and anxiety. There are also many complications of diabetes, such as diabetic retinopathy(DR). DR is the leading cause of vision loss in diabetes. Vision loss inevitably increases anxiety and/or depression, which in turn may directly or indirectly affect the treatment or progression of patients with DR. This article reviews how to determine the anxiety and depression status of patients with DR, related assessment tools and methods, and their interaction with the treatment of DR. The interaction of anxiety-depressive states with DR treatment was also discussed. This review aims to raise awareness of the mental health of patients with DR, enhance doctor-patient communication and build doctor-patient trust, thus enhancing treatment adherence and clinical efficacy for individuals with DR and helping them to improve the quality of life.