PURPOSE: To investigate the protective effect of sub-hypothermic mechanical perfusion combined with membrane lung oxygenation on ischemic hypoxic injury of yorkshire brain tissue caused by traumatic blood loss. METHODS: This article performed a random controlled trial. Brain tissue of 7 yorkshire was selected and divided into the sub-low temperature anterograde machine perfusion group (n = 4) and the blank control group (n = 3) using the random number table method. A yorkshire model of brain tissue injury induced by traumatic blood loss was established. Firstly, the perfusion temperature and blood oxygen saturation were monitored in real-time during the perfusion process. The number of red blood cells, hemoglobin content, NA⁺, K⁺, and Ca²⁺ ions concentrations and pH of the perfusate were detected. Following perfusion, we specifically examined the parietal lobe to assess its water content. The prefrontal cortex and hippocampus were then dissected for histological evaluation, allowing us to investigate potential regional differences in tissue injury. The blank control group was sampled directly before perfusion. All statistical analyses and graphs were performed using GraphPad Prism 8.0 Student t-test. All tests were two-sided, and p value of less than 0.05 was considered to indicate statistical significance. RESULTS: The contents of red blood cells and hemoglobin during perfusion were maintained at normal levels but more red blood cells were destroyed 3 h after the perfusion. The blood oxygen saturation of the perfusion group was maintained at 95% - 98%. NA⁺ and K⁺ concentrations were normal most of the time during perfusion but increased significantly at about 4 h. The Ca²⁺ concentration remained within the normal range at each period. Glucose levels were slightly higher than the baseline level. The pH of the perfusion solution was slightly lower at the beginning of perfusion, and then gradually increased to the normal level. The water content of brain tissue in the sub-low and docile perfusion group was 78.95% ± 0.39%, which was significantly higher than that in the control group (75.27% ± 0.55%, t = 10.49, p < 0.001), and the difference was statistically significant. Compared with the blank control group, the structure and morphology of pyramidal neurons in the prefrontal cortex and CA1 region of the hippocampal gyrus were similar, and their integrity was better. The structural integrity of granulosa neurons was destroyed and cell edema increased in the perfusion group compared with the blank control group. Immunofluorescence staining for glail fibrillary acidic protein and Iba1, markers of glial cells, revealed well-preserved cell structures in the perfusion group. While there were indications of abnormal cellular activity, the analysis showed no significant difference in axon thickness or integrity compared to the 1-h blank control group. CONCLUSIONS Mild hypothermic machine perfusion can improve ischemia and hypoxia injury of yorkshire brain tissue caused by traumatic blood loss and delay the necrosis and apoptosis of yorkshire brain tissue by continuous oxygen supply, maintaining ion homeostasis and reducing tissue metabolism level.
Animals ; Perfusion/methods* ; Disease Models, Animal ; Brain Injuries/etiology* ; Swine ; Male ; Hypothermia, Induced/methods*

Objective: To investigate the dietary lead exposure level among children aged 3 to 4 years in Jiading District, Shanghai Municipality, and assess the health risk caused by lead exposure, so as to provide the basis for the management of children's food safety. Methods: Based on the 2023 Dietary and Health Status Surveillance Project in Jiading District, children aged 3 to 4 years from 12 streets (townships) in Jiading District were selected as the subjects using a multi-stage stratified random sampling method. The consumption frequency and daily intake of seven subcategories of four major food groups (beans, tofu), cereals (wheat, rice), meat (animal viscera), and aquatic products (mantis shrimps, bivalves) consumed by children over the past three months were collected using a food frequency questionnaire. Food samples were collected according to the food safety risk monitoring plan in Jiading District, and the lead content was detected. The health risks of dietary lead exposure among 3-4-year-old children were quantitatively assessed using the single-factor pollution index method, the Nemerow comprehensive pollution index method, and the margin of safety (MOS) method. Results: A total of 143 3-4-year-old children were surveyed, including 69 boys (48.25%) and 74 girls (51.75%). A total of 317 food samples were tested, and lead was detected in all seven subcategories of food samples, with an overall detection rate of 77.29%. The detection rates of lead in bivalves and mantis shrimps of aquatic products were relatively high (98.75% and 100.00%, respectively). The mean lead content of various foods ranged from 0.003 4 to 0.090 7, with the highest level found in bivalves. The lead content of all food samples did not exceed the standard. The single-factor pollution index of seven subcategories ranged from 0.017 2 to 0.148 0, and the Nemerow comprehensive pollution index ranged from 0.116 5 to 0.424 4, both of which were less than 0.7. The MOS (mean) ranged from 0.000 3 to 0.003 9, with an overall MOS (mean) of 0.012 2. The MOS (P95) ranged from 0.005 7 to 0.055 9, with an overall MOS (P95) of 0.112 4, both of which were less than 1. Conclusions The lead pollution level in the diet among children aged 3 to 4 years in Jiading District is safe and clean, with an acceptable impact on food safety. However, the detection rate of lead is relatively high, and the main source of dietary lead exposure is aquatic products.

N-type voltage-gated calcium (Ca²⁺) channels (N-type VGCC, Ca_V2.2) mediate Ca²⁺ influx in response to action potential at the presynaptic terminal, and play an important role in synaptogenesis, neurotransmitter release and nociceptive signal transduction. It is a new target for the development of drugs for the treatment of neuralgia (chronic pain) and other major diseases. Due to the difficulty of calcium channel expression in vitro and the detection of channel current, there is a great lack of new drug screening models. In this study, we established and optimized the electrophysiological drug screening model using Xenopus laevis oocytes for the recombinant expression of Ca_V2.2 in vitro (this study were reviewed and approved by the Ethics Committee of Guangxi University, approval number: GXU-2023-0249). Firstly, the linear plasmids encoding cDNA of major subunit α1B and auxiliary subunits α2δ1 and β3 of rat Ca_V2.2 were used as templates for in vitro transcription to generate their related mRNA (cRNA), after which three kinds of cRNA were injected into Xenopus laevis oocytes at the mass ratio of 2∶1∶1 for expression. The two-electrode voltage clamp (TEVC) technique was used to detect the inward current produced by Ca_V2.2. At the same time, the expression conditions of Ca_V2.2 were optimized, and its gating function was characterized from the aspects of channel activation and inactivation. The results showed that 3-5 days after cRNA microinjection, stable Ca_V2.2-mediated barium ion (Ba²⁺) currents were successfully detected. The interference of endogenous potassium channels and Ca²⁺-activated chloride channels can be eliminated by tetraethylammonium hydroxide (TEAOH) and 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid tetrakis (BAPTA-AM) treatment. The maximum potential for Ca_V2.2 activation is 0 mV, and the current reverses to be outward when the membrane potential is greater than +50 mV. By fitting the steady-state activation and inactivation curves, the half-maximal activation potential and half-maximal inactivation potential of Ca_V2.2 are identified as -15.9 and -60.2 mV. In this study, a stable Ca_V2.2 expression system was established based on Xenopus laevis oocytes. The in vitro expression system can provide a new way for the screening of Ca_V2.2 active compounds or lead drugs.

The Wnt signaling pathway includes both classical and non classical pathways,Wnt5a-Frizzled-2 pathway participates in the Wnt/Ca2+signaling pathway in the non-classical pathway,which is activated by the Wnt-related protein Wnt5a and its ligand Frizzled-2.It can regulate some key sites in cells to affect cell signal transduction,and is closely related to cell growth process.Activation of Wnt5a-Fizzled-2 pathway occurs in some tissues with abundant blood supply,such as heart and brain tissues,during ischemia-reperfusion.Activation of the Wnt5a-Frizzled-2 pathway causes these intracellular calcium overload,ultimately promoting apoptosis.This article reviews the abnormal activation of Wnt5a-Frizzled-2 signaling pathway in ischemia-reperfusion injury diseases and the induced calcium overload leading to apoptosis,in order to provide reference for the study of physiological mechanisms of ischemia-reperfusion injury.

ObjectiveTo investigate the contamination status of Staphylococcus aureus in food and the presence of enterotoxin genes in Jiading District， Shanghai， and to provide a basis for the prevention and treatment of foodborne Staphylococcus aureus disease. MethodsFrom 2021 to 2023， 15 types of food were sampled for S. aureus testing， and the presence of five enterotoxin genes， including sea⁃see， was tested in the strains. ResultsOut of 705 food samples， 88 （12.48%） were positive for S. aureus. S. aureus was detected in 12 of the 15 food types， with the three food types with the highest positive rates being cold noodles （45.00%）， raw poultry （26.25%）， and vegetable salads （20.00%）. The enterotoxin gene carriage rate was 32.95% in food strains. The carriage rates for sea， seb， and sec were 7.95%， 12.50%， and 14.77%， respectively. Neither sed nor see was detected. The detection rate of strains carrying two types of enterotoxin genes was 2.27%. The enterotoxin carriage rates in strains from vegetables， beverages， and raw meat were 57.14%， 40.00%， and 30.00%， respectively. ConclusionThe S. aureus detection rate in food in Jiading District is much higher than the national average. The enterotoxin gene carriage rates are high， with food strains carrying sea， seb， and sec， with sec being the most prevalent. There is a need to enhance monitoring of S. aureus and enterotoxins， especially in high-risk foods such as noodles， vegetables， and non-packaged beverages.

AIM To study the phenylethanoid glycosides from Verbenae Herba.METHODS The 80%ethanol extract from Verbenae Herba was isolated and purified by silica gel,Sephadex LH-20,TLC and semi-preparative HPLC,then the structures of obtained compounds were identified by physicochemical properties and spectral data.RESULTS Nine compounds were isolated and identified as verbofficoside A(1),cistanoside D(2),epimeredinoside A(3),verbascoside(4),isoverbascoside(5),cistanoside C(6),cistanoside F(7),decaffeoylacteoside(8),jionoside C(9).CONCLUSION Compound 1 is a new compound.Compounds 3 and 6-9 are isolated from this plant for the first time.

AIM To explore the clinical effects of Bushen Huoxue Ointment Formula on patients with ankylosing spondylitis of Kidney Deficiency and Blood Stasis Pattern.METHODS One hundred and sixty-seven patients were randomly assigned into control group(55 cases)for 2-year intervention of conventional treatment,exposure group(54 cases)for 2-year intervention of both Bushen Huoxue Decoction and conventional treatment,and high exposure group(58 cases)for 2-year intervention of Bushen Huoxue Ointment Formula,Bushen Huoxue Decoction and conventional treatment.The changes in clinical effects,BASDAI score,ASDAS-CRP,BASFI score,spinal pain score,PGA score,BASMI score,ASQoL score,SPARCC score,Kidney Deficiency and Blood Stasis Pattern score,ESR,CRP,IL-6,TNF-α,IL-17,IL-23,IL-35,NLR,PLR and safety indices were detected.RESULTS The high exposure group demonstrated more ASAS40,ASASAS5/6,BASDAI50 cases than the exposure group and the control group(P<0.05).After the treatment,the high exposure group displayed lower BASDAI score,ASDAS-CRP,BASFI score,spinal pain score,PGA score,BASMI score,SPARCC score,ASQoL score,Kidney Deficiency and Blood Stasis Pattern score,ESR,CRP,IL-6,TNF-α,IL-17,IL-23 than the other two groups(P<0.05),and higher IL-35(P<0.05).After adjusting confounding factors by logistic regression analysis,Bushen Huoxue Decoction and Bushen Huoxue Ointment Formula reduced BASDAI score,ASDAS-CRP(P<0.05),and enhanced clinical effects(P<0.05).No serious adverse reactions were found in the three groups.CONCLUSION For the patients with ankylosing spondylitis of Kidney Deficiency and Blood Stasis Pattern,Bushen Huoxue Ointment Formula can safely and effectively inhibit inflammation,reduce disease activity,alleviate bone marrow edema,improve clinical symptoms,and enhance joint functions and life quality.

AIM To investigate the variation rules of main secondary metabolites in Hedysari Radix before and after rubbing strip.METHODS UPLC-MS/MS was adopted in the content determination of formononetin,ononin,calycosin,calycosin-7-glucoside,medicarpin,genistein,luteolin,liquiritigenin,isoliquiritigenin,vanillic acid,ferulic acid,γ-aminobutyric acid,adenosine and betaine,after which cluster analysis,principal component analysis and orthogonal partial least squares discriminant analysis were used for chemical pattern recognition to explore differential components.RESULTS After rubbing strip,formononetin,calycosin,liquiritigenin and γ-aminobutynic acid demonstrated increased contents,along with decreased contents of ononin,calycosin-7-glucoside and vanillic acid.The samples with and without rubbing strip were clustered into two types,calycosin-7-glucoside,formononetin,γ-aminobutynic acid,vanillic acid,calycosin-7-glucoside and formononetin were differential components.CONCLUSION This experiment clarifies the differences of chemical constituents in Hedysari Radix before and after rubbing strip,which can provide a reference for the research on rubbing strip mechanism of other medicinal materials.

Objective To compare the biomechanical properties of new type of unicortical and unilateral external fixators by finite element analysis.Methods Firstly,a tibia model was reconstructed based on the CT data images using Mimics software,and then processed and modified by Geomagic Wrap software.Secondly,Solidworks software was used to establish the 3D models for new type of unicortical and unilateral external fixators,and fracture defect was made in the tibia model and then the model was assembled with the external fixators.Finally,mesh delineation was performed using ABAQUS software,and axial compression,torsion and bending loads were applied to the assemblies,respectively,to observe the stress distributions and fracture displacements and to evaluate the biomechanical properties of the 2 types of external fixators.Results The new type of unicortical external fixator had the mean and maximum stresses at the nail-bone interface and the stress distribution at the pin-bone contact surface lower than those of the unilateral external fixator under the three different loads,which behaved better in torsional resistance while worse in axial compression and bending resistance than the unilateral external fixator.Conclusion The new type of unicortical external fixator has the biomechanical stability slightly weaker than that of the unilateral external fixator,which shows sufficient stability and reasonable load distribution when used for temporary fixation with lower likelihood of nail breaking,periprosthetic fractures of the tibia pin tract and loosening of the bone pins when compared with the unilateral external fixator.[Chinese Medical Equipment Journal,2024,45(11):32-38]