ObjectiveTo elucidate the mechanism by which total flavonoids of Abelmoschi Corolla （TFA） treat immunoglobulin A （IgA） nephropathy （IgAN） through serum metabolomics analysis. MethodsSPF-grade male SD rats were randomly assigned into six groups （n=10）： blank， model， low-dose TFA （TFA-L， 27 mg·kg^-1）， medium-dose TFA （TFA-M， 54 mg·kg^-1）， high-dose TFA （TFA-H， 108 mg·kg^-1）， and losartan potassium （LST， 4.5 mg·kg^-1） groups. The remaining five groups， excluding the blank group， were modeled with bovine serum albumin （BSA）， lipopolysaccharide （LPS）， and carbon tetrachloride （CCl₄）. Specifically， from weeks 1 to 10， BSA was administered via gavage every other day， and a mixture of castor oil and CCl₄ was injected subcutaneously once a week， with LPS injected into the tail vein at weeks 6 and 8. After successful modeling， each intervention group was administrated with the medication prepared with distilled water once daily by gavage for a continuous period of 4 weeks. The levels of 24-hour urinary total protein （24 h UP） and serum creatinine （SCr） were quantified by kits， and the serum IgA level was determined by enzyme-linked immunosorbent assay （ELISA）. Renal pathological changes were observed by hematoxylin-eosin （HE） staining and periodic acid-Schiff （PAS） staining. Renal IgA deposition was assessed by immunofluorescence （IF）. Endoplasmic reticulum （ER） stress was observed by transmission electron microscopy. Western blot and immunohistochemistry （IHC） were employed to detect the expression of ER stress-related factors. Non-targeted metabolomics was used to screen differential metabolites for analysis， and key metabolites arachidonic acid （AA）， prostaglandin E₂ （PGE₂）， and cyclooxygenase-2 （COX-2） were validated. ResultsCompared with the blank group， the model group showed increased 24-hour urine protein （24 h UP） and serum creatinine （SCr） levels （P<0.01）， obvious renal pathological damage， elevated serum IgA level （P<0.01）， increased renal AA and PGE₂ levels （P<0.01）， and up-regulated protein levels of COX-2， glucose-regulated protein 78 （GRP78）， phosphorylated eukaryotic initiation factor 2α （P-EIF2α）， activating transcription factor 4 （ATF4）， inositol-requiring enzyme 1α （IRE1α）， and spliced X-box binding protein 1 （XBP1s） in the renal tissue （P<0.05， P<0.01）. Compared with the model group， the intervention groups showed reductions in 24 h UP and SCr levels （P<0.05， P<0.01）， alleviated renal pathological injury， decreased serum IgA level （P<0.05， P<0.01）， and reduced renal AA and PGE₂ levels （P<0.01）. Western blot and IHC results showed that TFA reduced the levels of COX-2， GRP78， P-EIF2α， ATF4， IRE1α， and XBP1s in the renal tissue （P<0.05， P<0.01）. Metabolomics results indicated that 51 commonly differential metabolites were found among the normal， model， and TFA-M groups. TFA ameliorated IgAN by affecting metabolic pathways related to the biosynthesis of arachidonic acid and arginine through L-aspartic acid， prostaglandin 2α， leukotriene B₄， leukotriene D₄， among others. ConclusionTFA can regulate the arachidonic acid metabolism pathway， thereby modulating ER stress， reducing renal damage， and ameliorating IgA nephropathy.

Objective:To evaluate the effect of preoperative oral carbohydrate intake on postoperative nausea and vomiting (PONV) in elderly patients undergoing gynecological laparoscopic surgery.Methods:This study was a randomized controlled trial. One hundred elderly patients, aged≥65 yr, with a body mass index of 18-30 kg/m 2, with American Society of Anesthesiologists Physical Status classification Ⅰ or Ⅱ, who underwent gynecological laparoscopic surgery at the Baoding First Central Hospital from March 2023 to June 2024, were selected. Stratification was conducted by age (65-74 yr/≥75 yr) using an online randomization tool, and the patients were randomly divided into conventional fasting group (group C) and oral carbohydrate group (group P), with 50 cases in each group. Patients took oral carbohydrate drinks of 4 ml/kg at 2 h before operation, with total amount ≤400 ml in group P, while patients received conventional preoperative fasting protocols in group C. The occurrence and severity of PONV within 48 h postoperatively were observed. The visual analogue scale scores for hunger and thirst, State-Trait Anxiety Inventory scale scores, length of stay in the postanesthesia care unit, duration of hospital stay, time to first flatus, time to first ambulation, and patient′s satisfaction were recorded in the two groups. Results:Compared with group C, the incidence and severity of PONV were significantly decreased within 48 h after surgery, the visual analogue scale scores for hunger and thirst and State-Trait Anxiety Inventory scale scores were significantly decreased after entering the operating room, the length of stay in the postanesthesia care unit, time to first flatus and time to first ambulation were significantly shortened, and the patient′s satisfaction was significantly increased in group P ( P<0.05). Conclusions:Oral carbohydrate intake before operation can effectively reduce the occurrence and severity of PONV and improve the quality of postoperative recovery in elderly patients undergoing gynecological laparoscopic surgery.

Objective To investigate the association between antenatal white blood cell count(WBC)and the risk of histological chorioamnionitis(HCA)in pregnant women with late pregnancy premature rupture of membranes(PROM).Methods A retrospective analysis was performed on totally 118 pregnant women with PROM in late pregnancy from March 2018 to August 2021 in the hospital.They were divided into HCA group and non-HCA group according to the presence or absence of HCA.The general clinical data,laboratory indica-tors and delivery outcomes of the two groups were compared.Univariate and multivariate Logistic regression were used to analyze the association between prenatal WBC and HCA risk.Generalized additive models were used for curve fitting,and segmented regression models were used to further explain the nonlinear relationship between maternal prenatal WBC and HCA risk.Results The prenatal WBC of the HCA group was signifi-cantly higher than that of the non-HCA group(P＜0.001).After adjusting for covariates,elevated prenatal WBC increased the risk of HCA,with an OR of 1.190(95％CI:1.006-1.406,P=0.042).Curve fitting showed that there was a nonlinear relationship between prenatal WBC and HCA risk,and the log-likelihood ratio test of WBC at the inflection point 13.5×109/L(95％CI:11.75-14.56)was statistically significant(P=0.029).For the three groups of prenatal WBC,the risk of HCA in pregnant women gradually increased with the increase of WBC level,which was 0.314(95％CI:0.200-0.456)in the normal group,0.439(95％CI:0.252-0.645)in the high group,and 0.682(95％CI:0.354-0.893)in the elevated group.Conclusion The higher the prenatal WBC of pregnant women with PROM in late pregnancy,the greater the risk of HCA,but there is no simple linear relationship between the two,and there is a threshold effect.

The sealing performance is directly related to the safety,reliability and mission success rate of aerospace equipment.The sealing performance of rubber seals and the optimized design of the compression force directly affect the performance and work efficiency of the equipment.Based on the hyperelastic Mooney-Rivlin model of nonlinear materials,the mechanical properties of rubber are simulated,and a finite element model of rubber seals is established.Through simulation analysis,the effects of different cross-section dimensions and compression amounts on the sealing performance are studied and compared,and key parameters such as the contact stress distribution,maximum contact stress,and compression force.The size of the fillet affects the final deformation and the contact state.By optimizing the geometric parameters,the compression force can be reduced while ensuring the sealing performance,providing a theoretical basis for the optimized design of rubber seals.

Objective:To evaluate the effect of preoperative oral carbohydrate intake on postoperative nausea and vomiting (PONV) in elderly patients undergoing gynecological laparoscopic surgery.Methods:This study was a randomized controlled trial. One hundred elderly patients, aged≥65 yr, with a body mass index of 18-30 kg/m 2, with American Society of Anesthesiologists Physical Status classification Ⅰ or Ⅱ, who underwent gynecological laparoscopic surgery at the Baoding First Central Hospital from March 2023 to June 2024, were selected. Stratification was conducted by age (65-74 yr/≥75 yr) using an online randomization tool, and the patients were randomly divided into conventional fasting group (group C) and oral carbohydrate group (group P), with 50 cases in each group. Patients took oral carbohydrate drinks of 4 ml/kg at 2 h before operation, with total amount ≤400 ml in group P, while patients received conventional preoperative fasting protocols in group C. The occurrence and severity of PONV within 48 h postoperatively were observed. The visual analogue scale scores for hunger and thirst, State-Trait Anxiety Inventory scale scores, length of stay in the postanesthesia care unit, duration of hospital stay, time to first flatus, time to first ambulation, and patient′s satisfaction were recorded in the two groups. Results:Compared with group C, the incidence and severity of PONV were significantly decreased within 48 h after surgery, the visual analogue scale scores for hunger and thirst and State-Trait Anxiety Inventory scale scores were significantly decreased after entering the operating room, the length of stay in the postanesthesia care unit, time to first flatus and time to first ambulation were significantly shortened, and the patient′s satisfaction was significantly increased in group P ( P<0.05). Conclusions:Oral carbohydrate intake before operation can effectively reduce the occurrence and severity of PONV and improve the quality of postoperative recovery in elderly patients undergoing gynecological laparoscopic surgery.

In the past decades, significant progress has been achived in cartilage regeneration. The traditional techniques for constructing tissue engineering cartilage scaffold mainly include pore agent method (or template method), phase separation method, gas foaming method, freeze-drying method, electrospinning method, etc. Cartilage is heterogeneous, and it is difficult for traditional scaffolds to simulate the high anisotropy of cartilage. Therefore, functional regeneration of cartilage is challenging. With the progress of three-dimensional(3D) printing technology, it is possible to prepare functional bionic scaffolds with fine structure and gradient changes through co-deposition of biomaterials, cells and active biomolecules, so as to achieve functional cartilage regeneration. This article reviewed 3D printing technology of cartilage tissue engineering, and the application of 3D printing technology in cartilage regeneration at different anatomical positions (articular cartilage, auricle cartilage, nasal cartilage). In addition, the importance of preparing bionic constructs with regional structure gradient and regional composition gradient was discussed. 3D bioprinting technology, 4D printing techniques, smart biomaterials brought hope for the construction of bionic tissues and organs.

In the past decades, significant progress has been achived in cartilage regeneration. The traditional techniques for constructing tissue engineering cartilage scaffold mainly include pore agent method (or template method), phase separation method, gas foaming method, freeze-drying method, electrospinning method, etc. Cartilage is heterogeneous, and it is difficult for traditional scaffolds to simulate the high anisotropy of cartilage. Therefore, functional regeneration of cartilage is challenging. With the progress of three-dimensional(3D) printing technology, it is possible to prepare functional bionic scaffolds with fine structure and gradient changes through co-deposition of biomaterials, cells and active biomolecules, so as to achieve functional cartilage regeneration. This article reviewed 3D printing technology of cartilage tissue engineering, and the application of 3D printing technology in cartilage regeneration at different anatomical positions (articular cartilage, auricle cartilage, nasal cartilage). In addition, the importance of preparing bionic constructs with regional structure gradient and regional composition gradient was discussed. 3D bioprinting technology, 4D printing techniques, smart biomaterials brought hope for the construction of bionic tissues and organs.

Objective:To investigate the effect of anoxic cold environment at 4500 m altitude on female men-struation.Methods:From March 1 to March 20,2023,women in a unit at an altitude of 4500 meters were selected for reproductive health questionnaire survey,and were divided into≤6 months group,6 months to 12 months group and≥12 months group according to altitude exposure time.The changes of menstruation in each group were analyzed to explore the relevant influencing factors.Results:The total incidence of abnormal menstruation in working women in hypoxic cold environment was as high as 66.14%,and there was no statistically significant difference between the groups at different high-altitude exposure times(P＞0.05).The highest incidence of dys-menorrhea among the types of menstrual changes was 61.90%,but there was no statistically significant differ-ence between the groups at different high altitude exposure times(P＞0.05).There was a statistically significant difference(P＜0.05)in the proportion of insufficient sleep for at least 3 days per week,nervousness and anxiety,and training during their menstrual period in the women who experienced changes in their menstrual cycle com-pared to those who did not.Conclusions:Hypoxic cold environment can lead to the change of female menstrua-tion,and it is combined with sleep deficiency,tension and anxiety,and menstrual exercise.

Cerebral organoids are three-dimensional nerve cultures induced by embryonic stem cells(ESCs)or induced pluripotent stem cells(iPSCs)that mimic the structure and function of human brain.With the continuous optimization of cerebral organoid culture technology and the combination with emerging technologies such as organ transplantation,gene editing and organoids-on-chip,complex brain tissue structures such as functional vascular structures and neural circuits have been produced,which provides new methods and ideas for studying human brain development and diseases.This article reviews the latest advances in brain organoid technology,describes its application in neurological diseases and advances in stroke modeling and transplantation treatment.

Post-stroke cognitive impairment(PSCI)is mainly manifested as learning and memory disorders.Highly enriched RNA m6A methylation modification in mammalian brain is involved in glial cell-mediated neuroinflammation.Given that neuroinflammation is the main mechanism for neural damage and spatial and memory impairment of PSCI,it is speculated that RNA m6A methylation modification can regulate the inflammatory response of glial cells after stroke to improve PSCI.This review summarizes and analyzes the role of RNA m6A methylation modification in the development of PSCI and analyzes its detailed mechanism of regulating glial cell-mediated inflammation,which will provide reference for researchers in this field.