BACKGROUND:Cervical disc herniation can cause pain in the neck and shoulder area,as well as radiating pain in the upper limbs.The incidence rate is increasing year by year and tends to affect younger individuals.Fully understanding the biomechanical characteristics of the cervical spine in adolescents is of great significance for preventing and delaying the onset of cervical disc herniation in this age group. OBJECTIVE:To reconstruct cervical spine models for both healthy adolescents and adolescent patients with cervical disc herniation utilizing finite element analysis techniques,to analyze the motion range of the C1-T1 cervical vertebrae as well as the biomechanical characteristics of the annulus fibrosus,nucleus pulposus,endplates,and the cartilage of the small joints. METHODS:A normal adolescent's cervical spine and an adolescent patient with cervical disc herniation were selected in this study.The continuous scan cervical spine CT raw image data were imported into Mimics 21.0 in DICOM format.The C1-T1 vertebrae were reconstructed separately.Subsequently,the established models were imported into the 3-Matic software for disc reconstruction.The perfected models were then imported into Hypermesh software for meshing of the vertebrae,nucleus pulposus,annulus fibrosus,and ligaments,creating valid geometric models.After assigning material properties,the final models were imported into ABAQUS software to observe the joint motion range of the C1-C7 cervical vertebrae segments under different conditions,and to analyze the biomechanical characteristics of the annulus fibrosus,nucleus pulposus,endplates,and small joint cartilage of each cervical spine segment. RESULTS AND CONCLUSION:(1)In six different conditions,the joint motion range of the C1 vertebra in the cervical spine models of both normal adolescent and adolescent patient with cervical disc herniation was higher than that of the other vertebrae.Additionally,the joint motion range of each cervical spine segment in normal adolescent was greater than that in adolescent patient with cervical disc herniation.(2)In the cervical spine model of normal adolescent,the maximum stress values in the annulus fibrosus and nucleus pulposus were found on the left side during C2-3 flexion conditions(0.43 MPa and 0.17 MPa,respectively).In the cervical spine model of adolescent patient with cervical disc herniation,the maximum stress values were found on the left side during C7-T1 flexion conditions(0.54 MPa and 0.18 MPa,respectively).(3)In the cervical spine model of normal adolescent,the maximum stress value on the endplate was found on the left side of the upper endplate of C3 during flexion conditions(1.46 MPa).In the model of adolescent patient with cervical disc herniation,the maximum stress value on the endplate was found on the left side of the lower endplate of C7 during flexion conditions(1.32 MPa).(4)In the cervical spine model of normal adolescent,the maximum stress value in the small joint cartilage was found in the C2-3 left rotation conditions(0.98 MPa).In adolescent patient with cervical disc herniation,the stress in the small joint cartilage significantly increased under different conditions,especially in C1-2,with the maximum stress found during left flexion(3.50 MPa).(5)It is concluded that compared to normal adolescent,adolescent patient with cervical disc herniation exhibits altered cervical curvature and a decrease in overall joint motion range in the cervical spine.In adolescent with cervical disc herniation,there is a significant increase in stress on the annulus fibrosus,nucleus pulposus,and endplates in the C7-T1 segment.The stress on the left articular cartilage of the C1-2 is notable.Abnormal cervical curvature may be the primary factor causing these stress changes.

BACKGROUND:Ankylosing spondylitis is a chronic inflammatory disease with chronic rheumatic immunity.Soft tissue ossification and fusion and spinal stiffness can cause biomechanical changes. OBJECTIVE:To reconstruct the lumbar-sacral intervertebral disc in ankylosing spondylitis patients with lumbar kyphosis by finite element analysis,and to study the range of motion of each segment of T11-S1 and the biomechanical characteristics of annulus fibrosus and nucleus pulposus. METHODS:The imaging data were obtained from an ankylosing spondylitis patient with lumbar kyphosis.The original CT image data of continuously scanned spine were imported into Mimics 21.0 in DICOM format,and T11-S1 was reconstructed respectively.The established model was imported into 3-Matic software in the format of"Stl"to reconstruct the intervertebral disc,and the fibrous intervertebral disc model was obtained.The improved model was further imported into Hypermesh software,and the vertebra,nucleus pulposus,annulus fibrosus and ligament were mesh-divided.After the material properties were given,the model was imported into ABAQUS software to observe the range of motion of each vertebral body in seven different working conditions of T11-S1,and analyze the biomechanical characteristics of each segment of annulus fibrosus and nucleus pulposus. RESULTS AND CONCLUSION:(1)The range of motion of L1 vertebrae was higher than that of other vertebrae under six different working conditions:extension,forward flexion,rotation(left and right),and lateral flexion(left and right).The maximum range of motion was 2.18° during L1 vertebral flexion,and the minimum range of motion was 0.12° during L5 vertebral extension.(2)The annular fiber flexion at L2-L3 segments was greater than the extension(P<0.05),and the annular fiber flexion at L3-L4 and L4-L5 segments was less than the extension(P<0.05).The left rotation of L1-L2 annular fibers was greater than the right rotation(P<0.05).The left flexion of the annulus was greater than the right flexion in L1-L2,L2-L3,L3-L4,L4-L5 and L5-S1 segments(P<0.05).(3)The nucleus pulposus stresses of T11-L12,L1-L2,L2-L3,L3-L4 and L4-L5 segments in forward flexion were greater than in extension(P<0.05).The left rotation of T12-L1 and L3-L4 segments was smaller than the right rotation(P<0.05),and that of T11-T12,L1-L2,and L2-L3 segments was larger than the right rotation(P<0.05).The left flexion was larger than the right flexion in the T11-S1 segment.(4)It is concluded that in ankylosing spondylitis patients with lumbar kyphosis,the minimum range of motion of the vertebral body is located at the L5 vertebral body in extension.To prevent fractures,it is recommended to avoid exercise in the extension position.During the onset of lumbar kyphosis in patients with ankylosing spondylitis,the maximum stress of the annulus fibrosus and nucleus pulposus is located in the L1-L2 segment,which is fixed and will not alter with the change of body position.The late surgical treatment and correction of deformity should focus on releasing the pressure of the annulus fibrosus and nucleus pulposus in this segment to avoid the rupture of the annulus fibrosus and the injury of the nucleus pulposus.

BACKGROUND:Ankylosing spondylitis is a progressive inflammation of spinal stiffness deformity caused by tissue ossification and fibrosis.The posture of ankylosing spondylitis patients is abnormal and their activities are limited that minor injuries can lead to thoracolumbar fractures.Traditional medical image observation limits doctors'preoperative decision planning and postoperative disease prevention for ankylosing spondylitis treatment. OBJECTIVE:Based on the spinal model of ankylosing spondylitis patients before and after posterior spinal cancellous ossification osteotomy("Y"osteotomy for short),to explore the biomechanical changes of"Y"osteotomy and fixation in the treatment of ankylosing spondylitis. METHODS:Based on the preoperative and postoperative CT images of an ankylosing spondylitis patient who went to the Second Affiliated Hospital of Inner Mongolia Medical University,a three-dimensional spine model(T11-S1)before and after"Y"osteotomy(L3 osteotomy)was reconstructed in Mimics 19.0 software.A 7.5 Nm torque was applied to the top of T11 vertebral body to simulate the movement of the spine under six conditions:flexion,extension,left bending,right bending,left rotation and right rotation.Finally,the range of motion of each vertebral body,the stress of each intervertebral disc,and the stress of the screw rod system were simulated. RESULTS AND CONCLUSION:(1)After"Y"type osteotomy and posterior fixation,the range of motion of all vertebrae in the spine decreased,and the loss rate of upper vertebrae was large(L1:77.95%).(2)The maximum stress of the spinal intervertebral disc before operation occurred at the L1-L2 segment(0.55 MPa),and the maximum stress of the spinal intervertebral disc after operation occurred at the T11-T12 segment(0.50 MPa),and the stress of intervertebral disc below T12 was far less than that before operation.(3)The maximum stress of the screw rod system(166.67 MPa)occurred in the upper and middle segments of the rod body and the root of the pedicle screw.(4)In conclusion,the"Y"type posterior fixation operation enhances the stability of the spine and reduces the range of motion of the spine.The vertebral body decompression of the fixed segment is great and the stress-shielding phenomenon of the lower vertebral body is significant.The stiffness of the rod body and the stress concentration area of the pedicle screw should be strengthened to avoid the fracture of the rod caused by stress fatigue.

Objective To analyze the values of serum tumor necrosis factor-α stimulated gene 6 protein (TSG-6) and type ⅩⅥ collagen (col-16) in predicting the prognosis of patients with ulcerative colitis (UC). Methods A total of 160 patients with UC were enrolled as UC group, another 160 volunteers were selected as control group, and the levels of serum TSG-6 and col-16 were compared between the two groups. According to the modified Mayo scoring criteria, patients in the UC group were divided into mild group (n=63), moderate group (n=52), and severe group (n=45), and the levels of serum TSG-6 and col-16 were compared among the three groups. Based on the colonoscopy follow-up results, patients in the UC group were divided into good prognosis group (n=121) and poor prognosis group (n=39), and the levels of serum TSG-6 and col-16 were compared between the two groups. Spearman correlation analysis was used to explore the correlations of serum TSG-6 and col-16 with the modified Mayo score. Logistic regression analysis was used to investigate the impact of serum TSG-6 and col-16 on the prognosis of patients in the UC group. Receiver operating characteristic (ROC) curve was used to assess the values of serum TSG-6 and col-16 in predicting the prognosis of patients in the UC group. Results The levels of serum TSG-6 and col-16 in the UC group were significantly higher than those in the control group (P < 0.01). The levels of serum TSG-6 and col-16 in the moderate and severe groups were significantly higher than those in the mild group, and the levels of serum TSG-6 and col-16 in the severe group were significantly higher than those in the moderate group (P < 0.01). The levels of serum TSG-6 and col-16 in the poor prognosis group were significantly higher than those in the good prognosis group (P < 0.01). Spearman correlation analysis showedthat serum TSG-6 and col-16 were positively correlated with the modified Mayo score (r=0.691, P < 0.05; r=0.635, P < 0.05). Logistic analysis results showed that serum TSG-6 and col-16 were risk factors for poor prognosis (P < 0.001). ROC curve analysis showed that the areas under the curve for predicting poor prognosis in patients with UC were 0.773 and 0.765 for serum TSG-6 and col-16, respectively. Conclusion The levels of serum TSG-6 and col-16 are abnormally elevated in patients with UC, and there is a certain correlation of the two indexes with the severity and prognosis of disease, and the two indexes can be used as predictors of poor prognosis.

ObjectiveTo explore and establish the liver injury risk prediction model of indirect toxicity of Chinese medicinals under the condition of compound formulas， and provide new ideas and methods for the study of evaluation of liver injury of Chinese medicinals based on indirect toxicity. MethodsTaking Buguzhi （Fructus Psoraleae） pre-parations as model drug， the combined Chinese medicinals with Buguzhi （Fructus Psoraleae） of high frequency are screened out， and their components and action targets were obtained through TCMSP， TCMIP and PharmMapper databases. The association strength value and risk value of Chinese medicinals that acted on the nuclear factor κB （NF-κB） pathway were analyzed. For those having greater values than the median association strength value and risk value were regarded as indirect Chinese medicinals of liver injury risk. In this way， a prediction model of liver injury risk of Chinese medicinals was constructed based on immune activation-related indirect liver injury process （taking NF-κB pathway as an example）. And verification of the prediction model was performed using Heshouwu （Radix Polygoni Multiflori） preparations. ResultsThe prediction model of liver injury risk based on important immunoactivated pathway （taking NF-κB pathway as an example） found that Yinyanghuo （Herba Epimedii） （association strength value = 0.18， risk value = 0.25） was a Chinese medicinal with potential risk of indirect liver injury within Buguzhi （Fructus Psoraleae） prepartions， which may increase the risk of liver injury by positively regulating Bruton's tyrosine kinase （Btk） and protein kinase C theta （PKCθ） on NF-κB pathway. Further verification of prediction model by Heshouwu （Radix Polygoni Multiflori） preparations showed that Buguzhi （Fructus Psoraleae） （association strength value = 0.25， risk value = 0.33） and Tusizi （Semen Cuscutae） （Semen Cuscutae， association strength value = 0.34， risk value = 0.33） may increase the liver injury risk of Heshouzu. ConclusionThe liver injury risk prediction model of indirect toxicity of Chinese medicinals has been constructed in this study， providing metho-dological reference for the identification of Chinese medicinals of indirect liver injury risk under the condition of compound formulas.

ObjectiveTo establish a model of inflammasome activation induced by psoralidin based on bone marrow-derived macrophages （BMDM） in mice， and to explore the immunomodulatory effects of psoralidin combined with echinatin. MethodLipopolysaccharide （LPS） and psoralidin were used to activate inflammasomes， and after 4 h LPS stimulation， echinatin （40 μmol·L^-1） was administered for pre-protection for 1 h， followed by stimulation with psoralidin （10， 20， 40 μmol·L^-1） for 4 h. The protein expression of Caspase-1 p20 in cell supernatant and precursor （pro）-Caspase-1 and pro-interleukin（IL）-1β in cell lysate were simultaneously detected by Western blot. Enzyme-linked immunosorbent assay （ELISA） was adopted to determine the content of IL-β and TNF-α in the supernatant of BMDM. ResultWestern blot revealed that compared with the conditions in the control group， the maturation of psoralidin-induced pro-Caspase-1 and the secretion of IL-1β was inhibited by echinatin （P<0.05，P<0.01）. ELISA showed that the production of IL-1β and TNF-α was enhanced by psoralidin of different concentrations （P<0.05，P<0.01） compared with the condition in the control group. In addition， compared with the psoralidin group， the psoralidin combined with echinatin group reduced the secretion of IL-1β and TNF-α （P<0.01）. ConclusionEchinatin could significantly inhibited the excessive immune-inflammatory response mediated by psoralidin， and thus achieve the effect of toxicity reduction. The present study explored the toxicity-reducing effect of psoralidin combined with echiantin， providing a basis for safe clinical application.

Objective:To improve the users’ comfort of steady-state visual evoked potential (SSVEP)-based brain-computer interface (BCI) through high-frequency stimulation and overcome the problem of accuracy decline caused by high frequency by combining dual-frequency encoding.Methods:Two dual-frequency high-frequency 60-instruction paradigms based on left and right visual fields and checkerboard stimuli were designed based on the 25.5 - 39.6 Hz frequency. Thirteen subjects participated in the experiment, and spectrum and spatial characteristics analyses were performed on SSVEP signals. The filter bank parameters were optimized based on the spectrum characteristics. Extended canonical correlation analysis (eCCA), ensemble task-related component analysis (eTRCA), and task-discriminant component analysis (TDCA) were used for SSVEP recognition.Results:Stable SSVEP was successfully induced in both the left and right visual fields and the checkerboard grid paradigm. The left and right visual fields had high signal-to-noise ratios for the fundamental frequency and its harmonics and weak signal-to-noise ratios for intermodulation components, whereas the intermodulation components of the 2 stimulus frequencies of the checkerboard grid, f1 + f2, had significantly higher signal-to-noise ratios than the second harmonic components above 30 Hz, and there was also a f2 ? f1 component and a 2 f1 ? f2 component. Combined with brain topography, it can be seen that the f1 and f2 response components of the left and right visual fields are located on opposite sides of the visual field, while the checkerboard grids are both concentrated in the center of the occipital region. Regarding the lateralization of brain topography amplitude and signal-to-noise ratio, the mean values of the PO3 and PO4 signal-to-noise ratios at the stimulation frequency of the left and right visual fields are consistent with the contralateral response characteristics. The 5 fb ? 1 method is the optimal filter set setting method, and the recognition correctness rate of TDCA for the left and right visual fields is the highest. However, the comparison of the recognition correctness rate of tessellated lattice eTRCA and TDCA is not statistically significant ( P > 0.05). The information transmission rates of the three algorithms all increase and then decrease with the increase in data length. Conclusions:The designed dual-frequency, high-frequency SSVEP-BCI paradigm is able to better balance performance and comfort and provides a basis for practical large instruction set BCI design methods.

BackgroundThe etiopathogenesis of major depressive disorder （MDD） is strongly associated with neuroinflammation. MDD is a highly heterogeneous psychiatric disorder， and the disease subtyping is an essential step for the identification of biological markers. The presence of psychomotor retardation seriously affects the prognosis of MDD， whereas the underlying mechanism is not yet completely clear. A potential involvement of granulocyte colony-stimulating factor （G-CSF） and macrophage colony-stimulating factor （M-CSF） in the pathogenesis of MDD with psychomotor retardation has been suggested in previous studies， but little detailed research has been completed. ObjectiveTo analyze the correlation of plasma G-CSF and M-CSF levels with psychomotor retardation in patients with MDD， and to explore the potential biological underpinnings of psychomotor retardation in MDD. MethodsA total of 50 MDD patients who met the diagnostic criteria of the Diagnostic and Statistical Manual of Mental Disorders， fifth edition （DSM-5） and attended the outpatient clinics of Shanghai Mental Health Center from April 2018 to April 2019 were included. The severity of symptoms was assessed using the Hamilton Depression Scale-17 item （HAMD-17）. According to the retardation factor in HAMD-17， patients with a score of ≥8 were included in retardation group （n=22）， and those with a score below 8 were included in non-retardation group （n=28）. Another 22 age- and sex-matched healthy controls were concurrently recruited. Plasma G-CSF and M-CSF levels were measured in all subjects using Luminex liquid suspension chip technology. Spearman correlation analysis was adopted to verify the correlation of retardation factor score in HAMD-17 with plasma G-CSF and M-CSF levels in MDD patients. ResultsPlasma G-CSF levels were decreased in MDD patients compared with healthy controls ［57.34（39.24， 83.15）pg/mL vs. 71.47（61.20， 79.99）pg/mL， Z=-2.098， P<0.05］. A statistical difference was found in plasma G-CSF level ［63.92（54.60， 89.43）pg/mL vs. 47.80（33.41， 74.66）pg/mL vs. 71.47（61.20， 79.99）pg/mL， H=8.247， P=0.016］ and plasma M-CSF level ［20.05（16.05， 22.23）pg/mL vs. 13.05（11.43， 17.50）pg/mL vs. 18.95（14.59， 22.88）pg/mL， H=7.620， P=0.022］ among retardation group， non-retardation group and healthy control group. The post hoc pairwise comparisons using Bonferroni correction indicated that plasma G-CSF level was lower in non-retardation group compared with healthy control group （adjusted P<0.05）， and plasma M-CSF level was higher in retardation group compared with non-retardation group （adjusted P<0.05）. The retardation factor score in HAMD-17 was positively correlated with plasma M-CSF level in MDD patients （r=0.348， P<0.05）. ConclusionThe prevalence of psychomotor retardation in MDD patients may be related to abnormally elevated plasma M-CSF level. ［Funded by Shanghai "Science and Technology Innovation Action Plan" Project in Medical Innovation Research Field （number， 21Y11905600）； Shanghai "Science and Technology Innovation Action Plan" Project in Natural Science Field （number， 21ZR1455100）； Shanghai Mental Health Center Scientific Research Project （number， 2021-YJ02）］

Objective To establish a method and study the pharmacokinetics for concentration determination of effective components in Xiakucao Xiaoliu mixture in Normal Rat Plasma By LC-MS/MS. Methods The mobile phase was methanol-water (0.1% formic acid) system under the positive ion mode of C18 chromatographic column, gradient elution was adopted, and the flow rate was 0.3 ml/min. In the negative ion mode, the mobile phase was acetonitrile-water (0.1% formic acid) system, gradient elution, with a flow rate of 0.4 ml/min. Caffeic acid, rosmarinic acid, syringic acid, rutin in positive ion mode and Atractylodes lactone II and Atractylodes lactone III in negative ion mode were respectively determined. Normal rats were intragastrically given Xiakucao Xiaoliu Mixture 7.8 ml/kg, and blood was taken from the orbit at different time points after the administration. The blood concentration was determined by the validated LC-MS/MS method and the non-standard DAS2.0 software was used. The pharmacokinetic parameters of rats after administration were calculated by the compartment model. Results The pharmacokinetic parameters belonged to non atrioventricular model. The pharmacokinetic characteristics of the four main anti-cancer active ingredients of Caffeic acid, Rosmarinic acid, Syringic acid and Atractylodes Ⅲ in rats after administration of Xiakucao Xiaoliu Mixture were significantly different from those reported in the literature after the administration of monomers. Conclusion The established method was simple, accurate and sensitive, which could be suitable for the content determination of effective components in Xiakucao Xiaoliu mixture in Normal Rat Plasma, which would be a valuable information for the study on main anticancer active substances.

In recent years, the potential hepatotoxicity of green tea extract (GTE) has attracted more and more attention. With reference to the current studies on liver injury caused by GTE and the latest drug hepatotoxicity classification, this article systematically elaborates on the objectivity and causal mechanisms of liver injury caused by GTE. Based on the main risk factors for liver injury caused by GTE, this article also proposes recommendations for safe and rational use of such products, so as to provide valuable insights for in-depth research on the mechanism of liver injury caused by GTE and risk prevention and control, and meanwhile, it also provides an important reference for the therapeutic use of GTE to improve health conditions.