BACKGROUND:The imbalance between bone resorption and bone formation in microgravity environments leads to significant bone loss in astronauts.Current research indicates that bone loss under microgravity conditions is the result of the combined effects of various cells,tissues,and systems. OBJECTIVE:To review different biological effects of microgravity on various cells,tissues,or systems,and summarize the mechanisms by which microgravity leads to the development of osteoporosis. METHODS:Databases such as PubMed,Web of Science,and the Cochrane Database were searched for relevant literature from 2000 to 2023.The inclusion criteria were all articles related to tissue engineering studies and basic research on osteoporosis caused by microgravity.Ultimately,85 articles were included for review. RESULTS AND CONCLUSION:(1)In microgravity environment,bone marrow mesenchymal stem cells tend to differentiate more into adipocytes rather than osteoblasts,and hematopoietic stem cells in this environment are more inclined to differentiate into osteoclasts,reducing differentiation into the erythroid lineage.At the same time,microgravity inhibits the proliferation and differentiation of osteoblasts,promotes apoptosis of osteoblasts,alters cell morphology,and reduces the mineralization capacity of osteoblasts.Microgravity significantly increases the number and activity of osteoclasts.Microgravity also hinders the differentiation of osteoblasts into osteocytes and promotes the apoptosis of osteocytes.(2)In a microgravity environment,the body experiences changes such as skeletal muscle atrophy,microvascular remodeling,bone microcirculation disorders,and endocrine disruption.These changes lead to mechanical unloading in the bone microenvironment,insufficient blood perfusion,and calcium cycle disorders,which significantly impact the development of osteoporosis.(3)At present,the mechanism by which microgravity causes osteoporosis is relatively complex.A deeper study of these physiological mechanisms is crucial to ensuring the health of astronauts during long-term space missions,and provides a theoretical basis for the prevention and treatment of osteoporosis.

OBJECTIVE To study the effects and mechanism of Portulaca oleracea cream on skin pruritus and barrier function in allergic contact dermatitis （ACD） mice. METHODS Low-concentration and high-concentration P. oleracea creams were prepared， with the P. oleracea extract solution （1 g/mL， calculated by crude drug） concentrations of 10% and 20%. Sixty BALB/c mice were randomly allocated into blank group， model group， Mometasone furoate cream group （positive control）， blank matrix cream group， P. oleracea low-concentration and high-concentration cream groups. Except for blank group， ACD model was induced in each group using 2，4-dinitrochlorobenzene solution. The blank group and model groups received normal saline， while the remaining groups were treated with their respective creams， once a day， at a dose of approximately 0.5 g per application， continuously for 14 days. At 24 h post-final administration， skin lesions of mice were observed and scored； pathological changes of skin tissue were observed； serum levels of immunoglobulin E（IgE） and tumor necrosis factor-α （TNF-α） were quantified. mRNA expression of MAS-related G protein-coupled receptors （including MrgprA3， MrgprC11， and MrgprD） in dorsal root ganglion （DRG） was assessed； while protein expressions of skin barrier function-related proteins Claudin-1 and Occludin in skin tissues were determined. RESULTS Compared with blank group， mice in the model group exhibited severe skin damage， characterized by loss of epidermal architecture， hyperkeratosis of the skin tissue， and the infiltration of a large number of inflammatory cells. The skin injury scores， as well as the serum levels of IgE and TNF-α， and the mRNA expression levels of MrgprA3， MrgprC11， and MrgprD in DRG， were all significantly elevated compared to the blank group （P＜0.05 or P＜0.01）； in contrast， the protein expression levels of Claudin-1 and Occludin in the skin tissue were markedly reduced （P＜0.05）. Compared with model group， mice in P. oleracea low-concentration and high- concentration cream groups demonstrated significant alleviation of skin damage， as evidenced by reduced epidermal hyperplasia， mitigated spongiosis in the dermis， and decreased infiltration of inflammatory cells； these quantitative indicators were almost significantly reversed （P＜0.05 or P＜0.01）. No significant differences were observed in the aforementioned skin injuries， pathological alterations， or quantitative indicators between the blank matrix cream group and the model group. CONCLUSIONS P. oleracea may ameliorate skin lesions and restore skin barrier function of ACD mice， the mechanism of which may be associated with downregulating mRNA expressions of MrgprA3， MrgprC11 and MrgprD in DRG， and up-regulating the protein expressions of Claudin-1 and Occludin in skin tissue.

Objective To investigate the clinical effect of autologous bone combined with allogeneic bone in repairing bone defect after microwave in situ inactivation for bone giant cell tumor around the knee.Methods A retrospective analysis was conducted on the clinical data of 39 patients with bone giant cell tumor around the knee treated in our hospital from January 2015 to December 2022.The tumor tissues of all patients were performed microwave in situ inactivation first,then followed by curettage;the subchondral bone defect adjacent to the articular surface was reconstructed with autologous bone graft,and the remaining tumor cavity was filled with a composite of autologous and allogeneic bone;then a locking plate was applied for protective fixation.The early outcomes including operative time,intraoperative blood loss,hospital stay,wound healing,and surgery-related complications were recorded.The regular follow-up was conducted after surgery,then the tumor recurrence or metastasis was observed and the status of internal fixation and bone graft fusion along with its fusion time were recorded.The knee functions before operation and at the end of follow-up were evaluated with the Musculoskeletal Tumor Society(MSTS)scoring system.The radiographic joint degeneration was evaluated by the Aboulafia classification system at the end of follow-up.Results The patients showed a mean operative time of(134.7±14.2)minutes,an averaged intraoperative blood loss of(153.9±23.0)mL,and a mean hospital stay of(17.4±3.2)days.The patients obtained Ⅰ phase wound healing without any surgery-related complications such as neurovascular injury.All patients underwent the postoperative follow-up,without local recurrence or metastasis cases during the follow-up.At the end of follow-up,the MSTS score of patients was higher than that before operation(P<0.05),with an excellent and good rate of knee function recovery of 89.7%.At the end of follow-up,X-ray films showed good filling of the lesion and bone graft fusion,with a mean fusion time of(9.4±2.1)months.No collapse or fracture of the articular surface occurred.According to the Aboulafia classification,there were 20 cases of grade 0,11 cases of grade 1,and 8 cases of grade 2.Conclusion The autologous bone and allogeneic bone in repair of bone defect after microwave in situ inactivation for bone giant cell tumor around the knee has perfect knee function recovery,and can effectively prevent the collapse and degeneration of articular surfaces,which helps in the reconstruction of tumor cavity.

Aim To explore the effect of hydroxysafflor yellow A(HSYA)on lipocalin 2(LCN2)-induced fer-roptosis in HT22 cells and the related mechanism.Methods Thirty male Sprague-Dawley(SD)rats were used to establish the middle cerebral artery occlu-sion/reperfusion(MCAO/R)model by the suture method.The rats were randomly divided into the Sham group,the MCAO/R group,and the MCAO/R+HSYA group.The infarct area was measured by TTC staining,and the degree of neurological deficit was evaluated by the Z-Longa scoring method.The expressions of LCN2 and 24P3R in brain tissues were detected by Western blot.LCN2 protein was added to HT-22 cells,and the cells were divided into the normal group,the LCN2 group,and the LCN2+HSYA group.The optimal con-centration of LCN2-induced neuronal ferroptosis was screened by LDH assay and Western blot,and the ex-pression levels of ferritin,FPN1,GPX4,SLC7A11,COX2,and 24P3R were detected.LCN2 was knocked down by siRNA transfection,and the expressions of GPX4 and ferritin were detected.The contents of glu-tathione(GSH),malondialdehyde(MDA),GPX4,and Fe2+were determined by colorimetry,and the expres-sion of GPX4 was detected by immunofluorescence.The binding force between HSYA and LCN2 was ana-lyzed by molecular docking technology.Results Ani-mal experiments showed that HSYA could reduce the cerebral infarction area and decrease the neurological function score of MCAO/R rats.Compared with the sham group,the levels of LCN2 and 24P3R increased in the MCAO/R group,while HSYA inhibited their ex-pressions.Cell experiments showed that the optimal concentration of LCN2 to induce ferroptosis in HT22 cells was 2 μmol·L-1.After knocking down LCN2 by siRNA transfection,compared with the LCN2 group,the expression levels of GPX4 and ferritin in the siLCN2 group increased significantly.Compared with the nor-mal group,the expressions of SLC7A11,GPX4,FPN1,ferritin,and GSH in the LCN2 group decreased signifi-cantly,while the concentration of Fe2+,and the expres-sions of MDA,COX2,and 24P3R increased.HSYA could increase the expressions of SLC7A11,GPX4,FPN1,ferritin,and GSH,reduce the contents of Fe2+and MDA,and inhibit the expressions of COX2 and 24P3R.Molecular docking showed that the binding en-ergy between HSYA and LCN2 was-8.0 kJ·mol-1.Conclusion HSYA can inhibit LCN2-induced ferrop-tosis in HT22 cells through the SLC7A11/GPX4 signa-ling pathway.

Objective:To investigate the efficacy and safety of fluoroscopically-guided percutaneous gastrostomy (FGPG) for establishing enteral nutrition access in the treatment of esophageal fistula after radiotherapy for cervical esophageal cancer (CEC).Methods:A retrospective analysis was conducted on the clinical data of 54 patients who underwent FGPG due to esophageal fistula after radiotherapy for CEC at our department from November 2009 to August 2019. All patients received endoscopy before radiotherapy, and CEC was pathologically confirmed. Enteral nutrition support was offered through a gastrostomy tube postoperatively. The success rate of FGPG, complications, and healing of perforation were recorded and analyzed.Results:FGPG was successfully performed in all 54 patients (100%). During the 12-month follow-up, 50 patients (92.6) survived while four (7.4%) died. Among 36 patients with esophagomediastinal fistula, 32 (88.9%) healed in a median of 12 weeks; of 18 patients with esophagotracheal fistula, 8 (44.4%) healed in a median of 18 weeks. Thus, patients with esophagomediastinal fistula had a significantly higher healing rate ( P<0.01) and shorter healing time ( P=0.017). Gastrostomy tube-related complications were minimal, and no serious complication was noted. Conclusions:FGPG is effective for the treatment of esophageal fistula after CEC radiotherapy and may be an alternative treatment for esophageal fistula.

OBJECTIVE To establish a working model for the cough and asthma pharmaceutical care clinic and analyze the effects of outpatient pharmaceutical care interventions on patients.METHODS A pharmaceutical care clinic for cough and asthma was established in our hospital,with comprehensive regulations and rules,complete infrastructure and defined pharmaceutical care workflows.The demographic data of patients(gender,age,residence,disease duration and so on)were collected from May 2021 to December 2024.Indicators including health status,disease severity,inhalation technique,and medication adherence during visits and follow-up were collected and analyzed statistically,to assess the effects of pharmaceutical care interventions on patients.RESULTS The service procedure for the cough and asthma pharmaceutical care clinic in our hospital was established.A total of 215 patients'basic information was collected.It was found that among the patients,males accounted for 55.35%,with an average age of(60.91±15.75)years old.Patients aged 60 to 69 constituted the largest proportion at 28.37%,and they exhibited relatively poor medication adherence[with an average score of(5.64±1.76)].The majority of patients were diagnosed with chronic obstructive pulmonary disease(COPD)and prescribed budesonide/formoterol powder inhalers.In 68 follow-up cases,EQ-5D-5L scores increased by 5.81 points(P＜0.05);COPD Assessment Test(CAT)scores decreased by 4.05 points(P＜0.05),indicating reduced disease burden.Asthma Control Test(ACT)scores improved by 4.80 points,reaching partial control levels.Inhaler technique scores increased by 2.31 points(P＜0.05).Medication adherence scores rose by 1.09 points(P＜0.05).Patient satisfaction was over 90%.CONCLUSIONS After pharmaceutical care intervention,patients'health status,disease severity,inhalant use technique,and compliance have all improved,and their satisfaction with the cough and asthma pharmaceutical care outpatient service is high.The pharmaceutical care intervention provided by the cough and asthma pharmaceutical care outpatient service can improve patients'disease symptoms and medication compliance,and enhance the level of safe and rational drug use in the hospital.

Objective To propose an EBT3 film technology-based quality control measurement method for the INTRABEAM PRS500 intraoperative radiotherapy equipment to solve the problems of the traditional methods in cumbersome operation and setup error.Methods According to HJ 1198-2021 Requirements of radiation safety and protection for radiotherapy and GBZ 121-2020 Requirements for radiological protection in radiotherapy,the environmental radiation testing of the INTRABEAM PRS500 intraoperative radiotherapy equipment was carried out point by point by means of the radiation inspection instrument.The INTRABEAM PRS500 intraoperative radiotherapy equipment was characterized by a point X-ray source(XRS),and the XRS was detected in terms of the probe linearity,radiation dose,dynamic deviation,isotropy and dose rate.The EBT3 film technology was used to verify the symmetry and isotropy of the XRS planar dose of INTRABEAM PRS500 intraoperative radiotherapy equipment.Results The X-γ dose equivalent rate of each monitoring site of the INTRABEAM PRS500 intraoperative radiotherapy device was lower than the method detection limit(MDL).The results of SQA quality control showed that the INTRABEAM PRS500 intraoperative radiotherapy equipment XRS met the quality control requirements in terms of the probe linearity,radiation dose,dynamic deviation and etc,and the isotropy differences in the+X,-X,+Y,and-Y axis directions ranged from-1.40％to 1.79％,which were all within the allowable range of measurement tolerance(5.60％to 5.65％).The results of measuring the isotropy of the INTRABEAM PRS500 intraoperative radiotherapy equipment based on the EBT3 film technology showed that the dose distribution of the XRS in the directions of the+X,-X,+Y,and-Y axes at the same plane was well isotropic,and that the doses in the directions of the X and Y axes were symmetrically distributed,and that the maximum skewness value for the isotropy of the XRS in the XY plane was-1.581％,which met the requirements of AAPM TG61 report on the reference dosimetry of low-energy and medium-energy X-rays for radiotherapy and radiobiology of≤±5.3％.Conclusion The EBT3 film technology-based measurement method gains high simplicity and feasibility for the isotropy of the INTRABEAM PRS500 intraoperative radiotherapy equipment in the directions of the+X,-X,+Y,and-Y axes at the same planet,which realizes the dynamic monitoring of the dosimetric changes and facilitates the whole-process quality control management of the intraoperative radiotherapy equipment.[Chinese Medical Equipment Journal,2025,46(6):47-53]

Objective To retrospectively analyze the clinical risk factors and prognosis of perioperative myocardial injury(MINS)in non-cardiac surgery patients admitted to the intensive care unit(ICU).Methods A total of 478 postoperative patients admitted to the Department of Intensive Medicine,Minhang Hospital,Fudan University from Jan 2020 to Dec 2023 were selected.They were divided into MINS group(n=302)and normal group(n=176)based on whether myocardial injury occurred within 7 days after surgery.The differences in clinical characteristics between the two groups were compared,and risk factors for perioperative myocardial injury were identified.Risk factors for mortality in the MINS group were analyzed with 30-day mortality as the clinical endpoint.Results The prevalence of acute physiology and chronic health evaluation Ⅱ(Apache Ⅱ)score,coronary artery disease,and chronic kidney disease were all higher in the MINS group than those in the normal group,with statistically significant differences(P<0.05).The proportion of emergency surgeries,co-infection,and perioperative hypotension were significantly different between the MINS group and the normal group(P<0.05).Multivariate logistic regression analysis revealed that chronic kidney disease,emergency surgery,co-infection,and intraoperative and postoperative hypotension were risk factors for MINS occurrence.Prognostic analysis indicated that perioperative hypotension was a risk factor for 30-day mortality in MINS patients.Conclusion MINS is closely associated with patients'underlying conditions,timing of surgery,and perioperative hypotension status,and especially perioperative hypotension affects the final outcomes.

Objective:To explore the correlations between the monocytes/high-density lipoprotein ratio (MHR), alkaline phosphatase (ALP), and all-cause mortality in patients undergoing maintenance peritoneal dialysis (PD), and to provide references for clinical prevention and treatment strategies.Methods:A retrospective analysis was conducted on the clinical data of 336 PD patients who were treated in the Affiliated Hospital of Jining Medical University from June 2014 to August 2023. According to the survival status of the patients during the follow-up period, they were divided into the death group ( n=55) and the survival group ( n=281). The differences in clinical data, blood routine, laboratory biochemical indicators, monocyte count, high-density lipoprotein cholesterol, and ALP indicators between the two groups were collected and compared. Multivariate Cox regression analysis was used to screen the risk factors for all-cause mortality in PD patients, and Pearson correlation analysis was used to evaluate the correlation between the survival time of patients and related indicators. Results:In this study, there were 55 patients who died of all causes. The causes of death were cardiovascular events in 26 cases (47.27%), gastrointestinal bleeding in 3 cases (5.45%), infection in 7 cases (12.73%), multiple organ failure in 8 cases (14.55%), and unexplained death in 11 cases (20.00%). There was no statistically significant difference in gender, age, weight, serum parathyroid hormone (PTH), and total cholesterol (TC) between the death group and the survival group (all P>0.05). The treatment time, neutrophil count, red blood cell volume distribution width (RDW), ALP, blood uric acid (UA), blood calcium, MHR and creatinine in the death group were all higher than those in the survival group (all P<0.05), while the lymphocyte count was lower than that in the survival group ( P<0.05). The Cox risk model showed that MHR, ALP, treatment duration, neutrophil count, lymphocyte count, RDW, UA, and creatinine were independent risk factors for all-cause mortality in PD patients ( OR=1.578, 2.881, 1.021, 1.122, 1.476, 2.231, 1.018, 1.008, all P<0.05); Pearson correlation analysis revealed that the survival time of PD patients was negatively correlated with MHR and ALP ( r=-0.305, -0.246, all P<0.05). Conclusions:The levels of MHR and ALP are closely related to the risk of all-cause mortality in PD patients and are independent risk factors for all-cause mortality in patients.

Objective To explore the mechanism of action of tanthine in the treatment of allergic rhinitis(AR)complicated with asthma in rats by regulating microRNA-27a-3p(miR-27a-3p)targeting thymic stromal lymphopoietin(TSLP).Methods The AR-asthma rat model was established using ovalbumin(OVA)sensitization and nasal drip attack method.Fifty rats were divided into control group(equal volume 0.9％NaCl),model group(AR-asthma model+equal volume 0.9％NaCl),experimental group(AR-asthma model+100 mg·kg-1 xanthortin)and miR-27a-3p inhibitor group(caudal vein injection of 0.5 nmol·μL-1 miR-27a-3p inhibitor 10 μL on the basis of the experimental group),si-TSLP group(0.5 nmol·μL-1 si-TSLP 10 μL intravenously injected on the basis of miR-27a-3p inhibitor group),10 rats in each group.Serum immunoglobulin E(IgE),interleukin-2(IL-2),IL-13 and tumor necrosis factor-α(TNF-α)levels of rats were detected by enzyme-linked immunosorbent assay.The level of superoxide dismutase(SOD)was detected by xanthoxine oxidase method.The level of malonaldehyde(MDA)was detected by thiobarbituric acid method(TBA).Results The levels of IgE in control group,model group,experimental group,miR-27a-3p inhibitor group and si-TSLP group were(18.33±3.53),(89.95±17.62),(55.70±10.08),(78.43±15.30)and(47.87±9.44)ng·mL-1,respectively;IL-2 levels were(8.01±1.36),(19.61±3.94),(14.12±2.51),(17.33±3.18)and(11.89±2.03)pg·mL-1,respectively;IL-13 levels were(6.79±1.33),(34.15±7.02),(24.70±5.13),(35.97±7.24)and(20.53±4.26)pg·mL-1,respectively;TNF-α levels were(94.08±19.07),(312.47±58.61),(209.78±41.49),(296.42±55.99)and(187.45±37.28)pg·mL-1,respectively;SOD levels were(29.14±5.04),(13.25±2.63),(24.19±4.89),(17.28±3.16)and(33.94±5.87)U·mg prot-1,respectively;MDA levels were(2.26±0.51),(4.43±0.72),(3.17±0.58),(3.94±0.69)and(2.62±0.45)nmol·m gprot-1,respectively.The above indicators were compared between control group and model group,model group and experimental group,experimental group and miR-27a-3p inhibitor group,miR-27a-3p inhibitor group and si-TSLP group.The differences were statistically significant(all P＜0.05).Conclusion Xanthine can improve oxidative stress and reduce inflammation of AR complicated with asthma in rats,and its mechanism may be related to the regulation of miR-27 a-3p targeting TSLP.