ObjectiveTo compare the effect of toe-spread-out exercises (TSO) and modified TSO in females with hallux valgus. MethodsFrom September to December, 2023, a total of 45 females with hallux valgus were recruited in Capital University of Physical Education and Sports and randomly divided into blank control group (n = 15), TSO group (n = 15), and modified TSO group (n = 15). The blank control group received no intervention, the TSO group received routine TSO, and the modified TSO group received fibularis longus fascia release followed by TSO, for eight weeks. Changes in the hallux valgus angle (HVA) and the cross-sectional area (CSA) of the abductor hallucis muscle were measured before intervention, and four and eight weeks after intervention, respectively. ResultsOne case dropped out from the blank control group. The changes of HVA in the TSO and modified TSO groups were significantly greater than in the blank control group (F > 15.263, P < 0.05). After four weeks of intervention, the change of left HVA in the modified TSO group was significantly greater than in the TSO group (P < 0.05). The main effect of time was significant on the CSA of the abductor hallucis muscle (F > 13.245, P < 0.05). The main effect of group was significant on the left foot's CSA of the abductor hallucis (F = 3.798, P < 0.05). The interaction effect of time and group was also significant (F > 4.744, P < 0.05). The CSA of the abductor hallucis in both the TSO and modified TSO groups after four weeks and eight weeks of intervention was significantly greater than before intervention (P < 0.05). At eight weeks, the CSA of the right foot in the modified TSO group was significantly greater than in the blank control group (P < 0.05). ConclusionBoth TSO and modified TSO can improve HVA and the CSA of the abductor hallucis muscle in females with hallux valgus, and modified TSO is better.

ObjectiveTo compare the effect of three kinds of intrinsic foot muscle exercise on flatfoot. MethodsFrom September to November, 2022, 45 subjects with flatfoot from Capital University of Physical Education and Sports were randomly divided into short foot exercise (SFE) group (n = 15), toe-spread-out exercise (TSOE) group (n = 15) and short foot & toe-spread-out exercise (SF+TSOE) group (n = 15), who received SFE, TSOE and SF+TSOE, respectively, for eight weeks. The cross-sectional area of abductor hallucis muscle, navicular drop test (NDT) and Chippaux-Smirak index (CSI) were measured before treatment, four weeks after treatment and eight weeks after treatment. ResultsThree subjects dropped out in each group. The main effect of time was significant for left and right cross-sectional area of abductor hallucis muscle, NDT and CSI (F > 13.906, P < 0.001). The main effect of group was not significant for left and right cross-sectional area of abductor hallucis muscle, NDT and CSI (F < 1.934, P > 0.05). The interaction effect of group and time was significant for left and right NDT (F > 3.044，P < 0.05), and it was better in SF+TSOE group than in SFE group and TSOE group (P < 0.05). ConclusionSF and TSOE can improve the cross-sectional area of abductor hallucis muscle and foot morphology in subjects with flatfoot, and the combination of them may be more effective.

Central nervous system (CNS) injuries, including stroke, traumatic brain injury, and spinal cord injury, are essential causes of death and long-term disability and are difficult to cure, mainly due to the limited neuron regeneration and the glial scar formation. Herein, we apply extracellular vesicles (EVs) secreted by M2 microglia to improve the differentiation of neural stem cells (NSCs) at the injured site, and simultaneously modify them with the injured vascular targeting peptide (DA7R) and the stem cell recruiting factor (SDF-1) on their surface via copper-free click chemistry to recruit NSCs, inducing their neuronal differentiation, and serving as the nanocarriers at the injured site (Dual-EV). Results prove that the Dual-EV could target human umbilical vascular endothelial cells (HUVECs), recruit NSCs, and promote the neuronal differentiation of NSCs in vitro. Furthermore, 10 miRNAs are found to be upregulated in Dual-M2-EVs compared to Dual-M0-EVs via bioinformatic analysis, and further NSC differentiation experiment by flow cytometry reveals that among these miRNAs, miR30b-3p, miR-222-3p, miR-129-5p, and miR-155-5p may exert effect of inducing NSC to differentiate into neurons. In vivo experiments show that Dual-EV nanocarriers achieve improved accumulation in the ischemic area of stroke model mice, potentiate NSCs recruitment, and increase neurogenesis. This work provides new insights for the treatment of neuronal regeneration after CNS injuries as well as endogenous stem cells, and the click chemistry EV/peptide/chemokine and related nanocarriers for improving human health.

Objective To observe the effect of a hypoxia mimicking agent deferoxamine (DFO) on the mineral density,volume,architecture,strength,and metabolism of the bones in type 1 diabetic mice withosteoporosis.Methods Type 1 diabetic mice model was established by intraperitoneal injections of streptozotocin.The mice were divided into control (normal mice),diabetes mellitus,and DFO groups.Micro-CT was used to analyze the bone mineral density,volume,architecture,and strength of the trabecule in the distal part of femurs.Three point bending test was carried out to evaluate the bone strength.Hematoxylin and eosin (HE) staining was performed to observe the alteration in the number of osteoblasts.Real-time PCR was used to detect the mRNA expressions of Runt-related gene 2 (Runx-2),osteoclacin,and tartrate resistant acid phosphatase (TRAP) in tibias.Western blot was used to detect the protein expressions of Hypoxia-inducible factor-1α(HIF-1α) and vascular endothelial growth factor (VEGF) in tibias.Results There was a decrease in mineral density,volume,strength of bones as well as deteriorated trabecular microarchitecture in diabetic mice as compared to control mice,which were partially improved by DFO treatment.Moreover,DFO treatment increased the number of osteoblasts and mRNA expression levels of Runx-2,osteoclacin,TRAP,as well as protein expression levels of HIF-1 α and VEGF(P＜0.05).Conclusion Bone loss could be partially prevented by DFO treatment in type 1 diabetic osteoporosis mice,which might be ascribed to increased bone formation via stimulating hypoxia inducible factor singnaling pathway.

Objective To analyze histomorphometrical characteristics of the bone and bone marrow tissues of the lumbar vertebrae in rabbits with fluoride treatment,and its correlation with signal intensity of MRI.Methods Forty New Zealand albino rabbits aged three months old were randomly divided into fluoride exposure of 30 cases and control of 10 cases,male and female,half each.One hundred milligrams of sodium fluoride were added to the municipal water each liter (fluoride content 100 mg/L) as drinking waterto fluorine for 180 days.Twenty-four of 30 cases with fluoride exposure had complete data (male10 casesand female14 cases).The same municipal water was used as control drinking water (fluoride content ＜ 0.9 mg/L).Eight of 10 cases with control had complete data (male andfemale in half).Twenty-four cases with fluoride treatment and complete data were classified into sensitive and resistant type according to the MRI signal intensity of the lumbar vertebra.Histomorphometrics of the vertebra and its correlation with the MRI signal intensity,and sensitivity in early diagnosis of osteofluorosis and feasibility of susceptibility to osteofluorosis detected with MRI were analyzed.Results Theratios of trabecular bone volume (BV),hematopoietic cell volume (HV) and fluid volume (FV) in bone marrow tissue to total cavernous tissue volume (TT) in group with fluoride treatment were 18.3％±2.6％,45.2％±6.0％ and 10.4％±5.7％ respectively.These were 14.5％±2.8％,36.3％±7.3％ and 6.2％±2.1％ in control group respectively.These parameters in fluoride group were significantly increased compared to control group.The ratio 26.0％± 8.0％ of adipocyte volume (AV) to TV in fluoride group was significantly lower than that 43.3％±5.6％ in control group.Two of 24 cases with fluoride exposure (8.3％,2/24) were sensitive and the remaining 22 (91.7％,22/24) were in resistance.The valuesof BV/TT,HV/TV and FV/TV were considered to be sensitive,resistant and control from large to small,while AV/TV value were opposite.A comparison resuhs of signal intensity in MRI showed that vertebra T1WI contrast to noise ratio (CNR) in the sensitive was the minimum (3.0±0.8),followed by resistance (21.3±3.8) andmaximum in the control (28.3±3.1),but CNR of FsT2WIwas opposite.There were positive associations between T1WI and AV/TV,FV/TV and BV/TV,and between FsT2WI and FV/TV and BV/ TV.There were inverse associationsbetween FsT2WI and AV/TV.Theoptimal threshold value of the vertebra T1WI CNR was 23.2 or lessin early diagnosis of skeletal fluorosis,with sensitivity of 83.3％ and specificity of 100％.FsT2WI was 5.7 or more,with sensitivity of 45.8％ and specificity of 100％.Conclusion The pathogenesis of osteofluorosis is relative to changes in bone marrow microenvironment and cells number in bone marrow tissue,and is correlated to MRI signal intensity.

Objective To analyze histomorphometrical characteristics of bone and bone marrow tissue in the vertebral lamina of patients with osteofluorosis, and to explore the influencing factors on signal intensity in MRI. Methods Spinal MRI of 109 patients (57 men, 52 women;age range 32-80 years;mean age 52 years) with osteofluorosis from December 2001 to May 2012 was analyzed retrospectively, including 48 patients in cervical segment, 31 in thoracic segment and 30 in lumbar segment. 36 pa?tients (16 men, 20 women;mean age 51 years;age range 34-68 years) had undergone laminectomy and the vertebral lamina speci?mens were collected. The cervical MRI of 48 patients with matching gender and age (26 men, 22 women;mean age 51 years, age range 34-71 years) was selected as control group, who were from areas where fluorosis is not endemic. All patients were divided in?to vertebra low, medium and high signal groups according to T1WI of MRI. The vertebra signal to noise ratio measure and stan?dardization of signal intensity were performed. Osteosclerosis, osteoporosis and normal bone were differentiated under spinal X?ray plain film. Combined with histomorphometric analysis of vertebra lamina in 36 patients, correlation between MRI signal intensity, histomorphometric parameters of the vertebra lamina and influencing factors on signal intensity were studied. Results 77 pa?tients (70.6%, 77/109) had osteosclerosis indicated by appearance of spine under X?ray, 29 (26.6%, 29/109) osteoporosis and 3 (2.8%, 3/109) normal bone. T1WI of MRI showed 25 cases had low signal vertebra, 52 medium signal and 32 high signal. The ver? tebra SNR in patients with osteofluorosis was lower on T1WI, T2WI and short time inversion recovery (STIR) sequences, compared with control group. Those with a low versus high signal on T1WI had 6.04 times the odds of osteosclerosis (OR=6.04, 95%CI 2.44-14.91, P<0.001). Histomorphometry of vertebral lamina in 36 patients with osteofluorosis was performed, revealing that not only the trabecular bone volume had changed, but also did the adipocyte volume and hemopoietic cell volume in the bone marrow tis?sues. Compared with normal reference values, trabecular bone volume was significantly increased (47.7%± 13.3% vs. 14.7%± 4.3%) (P<0.001);adipocyte volume was significantly decreased (12.3%±9.1%vs. 50.5%±8.7%);hematopoietic cell volume was decreased (40.0%±7.0%vs. 42.5%±8.5%) (P=0.038). There were inverse associations between trabecular bone volume and adipo?cyte volume (r=-0.869, P<0.001), and between trabecular bone volume and T1WI (r=-0.851, P<0.001) found by Pearson correla?tion test. In contrast, there were positive associations between T1WI and adipocyte volume (r=0.927, P<0.001). Conclusion The vertebra T1WI signal intensity is decreased in patients with osteofluorosis, resulting from increase of trabecular bone volume and re?duction of adipocyte volume. The vertebra STIR signal intensity is decreased, mainly caused by increase of trabecular bone volume.

Objective To investigate the feasibility and effectiveness of inducing rabbit common carotid fusiform aneurysms via the common carotid extravascular digestion method. Methods Sixteen New Zealand white rabbits were randomly assigned into either an experiment group ( n=12 ) or a control group (n=4). Porcine pancreatic elastase 80-400 U were used to incubate and digest 2 to 4 cm segment of artery distal to the origin of right common carotid artery. One week after modeling,intravenous angiography was performed and the length and width of fusiform dilatation of common carotid artery were measured. The fusiform dilated artery was examined with hematoxylin and eosin staining and the vascular morphological changes were observed with scanning electron microscope. Isotonic saline solution was used to incubate common carotid arteries of the 4 New Zealand white rabbits in the control group. After one week,the same method was used to observe the lumen of common carotid artery and intimal changes. Results After the digestion of common carotid artery adventitia,the angiography of 12 New Zealand white rabbits of the experimental group revealed fusiform dilatation of common carotid artery of the 10 model rabbits. The widest diameter of the fusiform artery was 3. 70 ± 0. 32 mm;two rabbits had common carotid artery occlusion. Compared with the control group,the right common carotid artery diameter enlarged significantly in the experimental group (1. 80 ± 0. 16 mm,P<0. 01). The HE staining showed that the lumen widened, adventitia and media reduced. Scanning electron microscope showed intimal inflammatory injury and thrombus attachment. Conclusion Using porcine pancreatic elastase to digest the adventitia of common carotid artery can make fusiform dilatation of common carotid artery in rabbits. Using this method may effectively induce a model of fusiform aneurysm,and it has certain feasibility.

Objective To establish the carotid fusiform aneurysm model in rabbits carrying similar characteristics of human intracranial aneurysms by using induction method with porcine pancreatic elastase. Methods Twenty-five New Zealand white rabbits were randomly divided into normal control group (n=5), saline control group (n = 5) and study group (n = 15). The rabbits of the study group were randomly and equally subdivided into 7-day subgroup, 14-day subgroup and 21-day subgroup. By using induction method with porcine pancreatic elastase to digest right common carotid the fusiform aneurysm model was established in all the rabbits of the study group. DSA examination , HE staining and elastic fiber staining pathologic examination were carried out at 7, 14 and 21 days after the procedure to observe the imaging and pathologic changes of the fusiform aneurysm models. Results DSA angiography showed that the mean vascular diameters of the normal control group and the saline control group were (1.64 ± 0.17) mm and (1.66 ± 0.24) mm respectively. The mean length and width of the fusiform aneurysm of the 7-day subgroup, 14-day subgroup and 21-day subgroup were (19.33 ± 1.65) mm and (2.86 ± 0.21) mm, (19.66 ± 1.18) mm and (3.95 ± 0.54) mm, and (19.84 ± 0.82) mm and (4.03 ± 0.95) mm, respectively. Pathologically, rupture of internal elastic membrane, disordered structure of tunica media smooth muscle and distortion of cell shape were observed in the rabbits of 7-day subgroup. Gradually stabilized aneurysmal lumen intimal hyperplasia was seen in the rabbits of 14-day subgroup. Remarkable structure changes at the aneurysmal neck-cavity junction were found in the rabbits of 21-day subgroup. Elastic fiber staining demonstrated that strikingly thinned elastic layer was observed in the rabbits of 7-day subgroup, gradually thinning elastic layer at the aneurysmal neck-cavity junction was seen in the rabbits of 14-day subgroup, and the thinned elastic layer became stable in the rabbits of 21-day subgroup. Conclusion Using simple surgical method combined with porcine pancreatic elastase to digest vascular wall, carotid fusiform aneurysm models can be reliably established in New Zealand white rabbits which carry similar morphologic and pathologic characteristics of human intracranial aneurysms.

BACKGROUND:Vascular endothelial growth factor (VEGF) is a crucial factor for regulating bone marrow mesenchymal stem cells in microenvironment, which can promote endothelial differentiation of bone marrow mesenchymal stem cells. But there is no report about VEGF effect on regulating the proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells. OBJECTIVE:To investigate the regulatory role of VEGF in the proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells. METHODS:The bone marrow mesenchymal stem cells were isolated and cultured from mouse long bones. cellCounting Kit-8 was used to test the proliferation of bone marrow mesenchymal stem cells cultured with different concentrations of recombinant VEGF proteins. The appropriate concentration of VEGF recombinant protein was selected to test their effects on the osteogenic differentiation of bone marrow mesenchymal stem cells. The mRNA and protein levels of Osterix, Runx2, alkaline phosphatase, osteocalcin and heme oxygenase-1 in bone marrow mesenchymal stem cells under induction of VEGF were detected by molecular biology methods. RESULTS AND CONCLUSION:(1) VEGF promoted the proliferation of bone marrow mesenchymal stem cells dose-dependently, and 100μg/L was the optimum concentration. (2) VEGF promoted the expression of Osterix, Runx2, alkaline phosphatase and osteocalcin in bone marrow mesenchymal stem cells under osteogenic induction. Similar results were obtained by alizarin red staining and quantification of numbers of calcium nodules. (3) VEGF induced the expression of heme oxygenase-1 in bone marrow mesenchymal stem cells at mRNA and protein levels. These findings indicate that VEGF can induce the expression of heme oxygenase-1 i in bone marrow mesenchymal stem cells, and promote the proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells.

Objective:To analyze the factors that affect patient prognosis after radical nephrectomy.Meth-ods:A total of 389 cases of renal cell carcinoma treated with radical nephrectomy between January 1 993 and December 2006 were reviewed.All the data were encoded.inserted into an Excel database and then ana-lyzed by SPSS 1 3.0 software.The cumulative survival rates were calculated by life-table method.We as-sessed the impact of multiple covariates on survival time with the Cox Regression model.Results:The patho-logical results showed that 307 cases were clear call carcinoma,51 cases were papillary renal cell carcinoma,21 cases were chromophobic renal cell carcinoma,2 cases were collecting duct carcinoma.and 8 cases were unclassified.One hundred and ninety-eight cases were of T1N0M0, 113 cases were of T2N0M0, 3 cases were of T1N1M0,10 cases were of T2N1M0, 51 cases were of T3N0M0, and 14 cases were of T3N1M0, Two hundred and sixty-eight cases were followed up.The 1-year survival rate was 96.5%,the 3-year survival rate was 90.7%.the 5-year survival rate was 75.7%.and the 10-year survival rate was 65.8%.Multivariable analysis revealed that significant prognostic factors included TNM stage,Robson stage.vena cava and supplementary treat-ment(X2=22.50.P=0.001).The most important prognostic factor was pathological stage(TNM and Robson).The regression coefficients were 0.533 and 0.674,and the relative risk was 1.941 and 2.01 1(P=0.004 and p=0.002).Conclusion:Radical nephrectomy is safe and effective.TNM stage.Robson stage and vena cava are prognostic factors.Supplementary treatment is a protective factor.