BACKGROUND:The anterior cruciate ligament has unique nonlinear mechanical properties under a complex physiological loading environment.Elastin is an important contributor to the mechanical properties of the anterior cruciate ligament,but its mechanical response to the anterior cruciate ligament under axial tension is not clear. OBJECTIVE:To quantitatively analyze the effect of elastin on the tensile mechanical response of the anterior cruciate ligament. METHODS:Elastase solution and control buffer were prepared.The porcine anterior cruciate ligament samples were prepared into small-size samples and randomly soaked in 0,0.1,1.0,2.0,5.0,and 10.0 U/mL elastase solution for 6 hours,and other small samples of the same size were soaked in 2 U/mL elastase solution for 0,1,3,6,9,and 12 hours.To determine suitable soaking conditions for elastin-targeted enzymes and verify the digestive effect,histological staining was used to compare the effects of enzyme treatment on tissue structure and composition.The ligament samples were randomly divided into elastase-treated group and PBS group,and immersed in 2 U/mL elastase solution and PBS buffer for 6 hours,respectively.A mechanical tensile test was performed before and after immersion. RESULTS AND CONCLUSION:(1)The biochemical results showed that being treated in 2 U/mL elastase solution for 6 hours could reduce the elastin content by 31.1%,and had no significant effect on other mechanical-related components in the tissue.(2)The histological results showed that elastase was able to penetrate the tissue,and the loose degree of tissue increased after treatment.(3)In the mechanical results before and after treatment,the mechanical properties of the PBS group decreased significantly,only the low-tension elastic modulus increased significantly and the initial length increased significantly in the elastase-treated group.(4)The intergroup comparison results showed that there was no significant difference between the two groups in pre-treatment,but the low-tension elastic modulus,initial slopes,saturated slopes,and initial length of the elastase-treated group after treatment were significantly higher than those in the PBS group.(5)These results suggest that elastin degradation significantly affects the biomechanical properties of the anterior cruciate ligament and further complements our understanding of the structure-function relationship of the anterior cruciate ligament.

AIM:This study aimed to investigate the expression and localization of ALOX12P2 in oral squa-mous cell carcinoma(OSCC),as well as its effects on cell viability,migration,and invasion.METHODS:The expres-sion of ALOX12P2 in head and neck squamous cell carcinoma(HNSCC)tissues and its correlation with clinicopathologi-cal features were analyzed using the UALCAN database(University of Alabama at Birmingham Cancer Data Analysis Por-tal).Additionally,the expression of ALOX12P2 in OSCC and its impact on survival prognosis were evaluated through the GDC and UCSC Xena databases.The expression levels of ALOX12P2 in OSCC cell lines were assessed via quantitative re-al-time PCR(RT-qPCR).The subcellular localization of ALOX12P2 was determined using nucleoplasmic RNA isola-tion.CAL-27 cells were used to establish an ALOX12P2 knockdown group(SS-ALOX12P2)and a control group(SS-NC).HN30 cells were employed to form an ALOX12P2 overexpression group(ALOX12P2)and a control group(vector).The effects of altered ALOX12P2 expression on the epithelial-mesenchymal transition(EMT)-related gene E-cadherin and the PI3K/AKT signaling pathway were assessed through Western blot analysis.RESULTS:ALOX12P2 expression was significantly higher in HNSCC and OSCC tissues compared to normal tissues,with its expression correlating with poor prog-nosis.RT-qPCR analysis indicated that the relative expression of ALOX12P2 in OSCC cells was comparable to that in nor-mal cells(P<0.05).RNA nucleoplasmic isolation confirmed that ALOX12P2 localized in the nucleus.In comparison to the SS-NC group,the SS-ALOX12P2 group exhibited a marked reduction in ALOX12P2 expression(P<0.01),alongside significant decreases in cell viability,migration,and invasion(P<0.01).Conversely,the ALOX12P2 group showed sub-stantially higher relative expression compared to the vector group(P<0.01),with enhanced cell viability,migration,and invasion abilities(P<0.01).Western blot analysis demonstrated that ALOX12P2 knockdown resulted in upregulation of E-cadherin and downregulation of N-cadherin and Vimentin(P<0.01),while overexpression of ALOX12P2 yielded the opposite effects(P<0.01).Knockdown of ALOX12P2 led to decreased protein expression of p-PI3K and p-AKT(P<0.01),whereas overexpression increased these protein levels(P<0.01).CONCLUSION:ALOX12P2 is highly ex-pressed in OSCC and promotes cell viability,migration,and invasion.This effect may be linked to the activation of the PI3K/AKT signaling pathway,which facilitates the epithelial-mesenchymal transition(EMT)process.

Objective : To investigate the effects of one night of sleep deprivation on adults ’cognitive performance and sleepiness. Methods : The study employed a repeated⁃measures design. Participants performed cognitive performance tasks , which included the Continuous Performance Test and Digit Span Test and Karolinska Sleepiness Scale. The data were analyzed using one⁃way repeated⁃measures ANOVA. Results : 48 participants were included in this study. Sleep deprivation during night shift had a adversely affect on sustained attention performance and alertness (P < 0. 05) . Compared with the beginning of night shift work , the correct number decreased , the number of errors , missed number and reaction time increased , and the score of Karolinska sleepiness scale decreased after the night shift work. The sleep deprivation has no significant effect on working memory performance (P > 0. 05) . Conclusion One night of sleep deprivation has significant deleterious effects on cognitive performance and subjec⁃ tive sleepiness. However, no effect on the working memory performances has been found.

Objective:To know the clinical characteristics, seasonal pattern and influencing factors of atypical depression(AD) patients.Methods:A total of 203 depressed outpatients of Peking University Sixth Hospital from January 2021 to August 2021 were included.They were assessed with demographic questionnaire, inventory of depressive symptomatology self-report(IDS-SR30) and seasonal pattern assessment questionnaire(SPAQ). According the score of IDS-SR30, all patients were classified as atypical depression(AD) and non-atypical depression(non-AD). The data were analyzed by t-test, non-parametric test and Logistic regression using SPSS 26.0 software. Results:The prevalence of AD among depressed patients was 36.0% (95% CI=29.3%-42.6%). The IDS-30 score of the AD group was (41.59±10.59), and IDS-30 score of the non-AD group was (36.08±13.17), and the difference between the two groups was statistically significant ( t=3.062, P<0.05). The global seasonal score of the AD group was 6 (3, 9), and 17.8% of the AD group had seasonal pattren.The global seasonal score of the non-AD group was 5 (3, 8), and 14.6% of the non-AD group had seasonal pattern.There was no significant difference in the global seasonal score and the proportion of seasonal pattern between the two groups ( Z=0.389, χ2=0.359, P>0.05). Depression patients who were females ( β=1.08, OR=2.95, 95% CI=1.32-6.59, P<0.05), low self-evaluation ( β=0.82, OR=2.27, 95% CI=1.12-4.59, P<0.05)and psychomotor retardation ( β=0.93, OR=2.54, 95% CI=1.33-4.85, P<0.05) were more likely to be diagnosed as AD, and depression patients having mood variation ( β=-0.94, OR=0.39, 95% CI=0.19-0.81, P<0.05) were more likely to be diagnosed as non-AD. Conclusion:Women, low self-evaluation, psychomotor retardation and unobvious mood variation can predict and help to diagnose atypical depression in depressed patients.

Objective To measure the peripheral dose distributions of the mobile head cone beam computed tomography (CBCT) and evaluate the impact of CBCT on the surrounding personnel and environment, and provide data support for clinical radiation protection management. Methods Combined with the structural characteristics of CBCT, AT1123 was used in the direction of 0° (counterclockwise), 45°, 90°, 135°, 180°, 225°, 270° and 315° in front of CBCT to measure the ambient dose equivalent rate of 30 cm, 80 cm and 130 cm away from the ground when the equipment was normally out of the beam, and the boundary of the temporary control area was drawn. At the same time, the dose level behind the lead screen 1 m away from the external surface of the equipment was measured and analyzed. Results The dose field around CBCT was symmetrically distributed with the dividing line of 0° and 180°, and the radiation dose level of 5.5 m in the direction of 0°, 3.5 m in the direction of 45°, 0.5 m in the direction of 90° and within 1.0 m in the direction of 180° (inside the "spoon" type) was higher than 2.5 μSv/h. The radiation dose levels of CT aperture 0° (straight forward), 45° and 315° behind the lead screen 1 m away from the equipment surface were 0.37 μSv/h, 0.22 μSv/h and 0.54 μSv/h, respectively. Conclusion The results show that the radiation dose around the mobile head cone beam CT is in a low dose level, the distribution of the dose field can provide necessary reference for the administrative and medical personnel to strengthen the radiation safety management. At the same time, it is suggested that lead screens should be set up in the clinical use of mobile CT to ensure the health and safety of the surrounding people and the environment.

Objective: To investigate the prognostic value of albumin-to-bilirubin scores in the assessment of autoimmune hepatitis-related cirrhosis. Methods: The receiver operating characteristic curve was used to evaluate the accuracy of ALBI, Child-Pugh and model for end-stage liver disease (MELD) for prognosis prediction. Survival analysis was performed according to the ALBI classification. Spearman correlation analysis was performed on the ALBI score and the Child-Pugh score. Survival curves were plotted by Kaplan-Meier method, and Log-rank method was used to compare the survival difference curves between different groups. Results: 149 patients were recruited in the study. The ROC analysis showed that the ALBI scores (0.861, 0.826, 0.779, 0.744)was superior to Child-Pugh scores(0.703, P = 0.006; 0.672, P < 0.001; 0.613, P < 0.001; 0.583, P < 0.001)and MELD score(0.774, P = 0.031; 0.731, P = 0.007; 0.669, P < 0.001; 0.631, P < 0.001) for predicting 6, 12, 24, and 36 months mortality. Patients with ALBI grade 3 had a significantly lower survival rate than those with ALBI grade1 and grade 2. Conclusion ALBI score may be useful to evaluate the long-term prognosis of patients with autoimmune hepatitis-related cirrhosis.

Objective To explore the sensitivity and specificity of near-infrared spectroscopy ( NIRS) in the diagnosis of depression. Methods From March 2013 to August 2013,62 patients with de-pression and 70 normal controls were collected from Peking University Sixth Hospital. Optical Tomography System (52 channels) was used to collect the NIRS data during the Verbal Fluency Test (VFT),and the number of words produced during VFT task was recorded. The wave analysis was performed by a professional psychiatrist. Results There was statistical difference in the number of words produced during VFT task be-tween the patients with depression (8.65±0.49)and control group(10.19±0.43) ( t=2.385, P<0.05). Through the wave analysis of NIRS to test patients with depression,the results demonstrated that the sensitivi-ty was 66.1% and the specificity was 91.4%. Conclusion The results of NIRS test display high specificity in the diagnosis of depression,which can be used as an objective index for clinical auxiliary diagnosis.

AIM:To investigate the effects of taurine on lipopolysaccharide ( LPS)-induced myocardial damage in rats.METHODS:Healthy male SD rats ( n=30) were randomly divided into control group ( CON) , LPS model group ( LPS) and taurine treatment group ( TAU) .The rats in CON group and LPS group were intravenously injected with normal saline, and the rats in TAU group were injected with taurine (100 mg/kg).After 2 h, the rats in LPS group and TAU group were intraperitoneally injected with LPS at 10 mg/kg, and the rats in CON group were injected with normal saline . Six hours after injection of LPS , the blood samples were collected for determination of superoxide dismutase ( SOD) activi-ty, malondialdehyde (MDA) content, and tumor necrosis factor α(TNF-α) and interleukin-6 (IL-6) levels.The myocar-dial tissues were processed for histological examination and the analysis of Western blot .RESULTS:Compared with CON group, LPS significantly reduced SOD activity in the serum and heme oxygenase 1 ( HO-1) protein expression in the myo-cardial tissues, increased the serum content of MDA and levels of TNF-αand IL-6.LPS also significantly elevated the lev-els of TNF-αand IL-6, and up-regulated the cyclooxygenase-2 ( COX-2) expression and phosphorylation of nuclear factor kappa B ( NF-κB) in the myocardial tissues .Taurine pretreatment significantly elevated SOD activity and HO-1 protein ex-pression level, decreased the levels of COX-2, TNF-α, IL-6 and phosphorylated NF-κB.Histological observation showed that taurine reduced inflammatory response in the myocardial tissue .CONCLUSION: Taurine attenuates LPS-induced myocardial damage in rats .The beneficial effects of taurine may be associated with its reduction of p-NF-κB/COX-2 signa-ling by activation of HO-1/CO.

Objective To evaluate the valuse of endoscopic ultrasonography ( EUS ) for upper gastrointestinal submucosal lesions and the role of Photoshop in differentiating leiomyoma and stromal tumors. Methods Data of 656 patients with upper gastrointestinal submucosal lesions evaluated by EUS and receiving endoscopic submucosal dissection ( ESD ) from April 2010 to March 2015 were collected and retrospectively analyzed. The goldern standard for lesions size and origin was the intraoperative diagnosis of ESD, and that of the type of lesions ( leiomyoma, stromal tumor, ectopic pancreas, lipoma, etc.) was pathological and immunohistochemical finding. The consistency of diagnosis of the EUS was evaluated. In addition, Photoshop was used to differentiate diagnosis of leiomyoma and stromal tumors which were confirmed by pathology and immunohistochemistry. Results The consistency in diagnosing the size and lesion origins was 92?56%(560/605) and 88?43%(535/605)between EUS and ESD intraoperative result. The consistency in pathological types of EUS was 79?34%(480/605). Photoshop was used to analyze the EUS images of 177 stromal tumor and 241 leiomyoma. The gray value of stromal tumor was significantly higher than that of leiomyoma(59?97 VS 39?39, t=43?27, P<0?05).The echo of stromal tumor was higher. The standard deviation of gray value of leiomyoma were significantly lower than that of the stromal tumor ( 4?81 VS 5?42, t = 2?83, P < 0?05 ) , indicating the echo uniformity of leiomyoma was better. Conclusion EUS shows high accuracy rate for upper gastrointestinal submucosal lesions, providing more accurate basis for endoscopic therapy. EUS combined with Photoshop is helpful for differentiating stromal tumor from leiomyoma.

Objective To explore the effects of emotion on cognitive function in patients with depression.Methods Self-rating anxiety scale(SAS),self-rating depression scale (SDS) and the typical one-back task were done by 397 patients with depression in Peking University Sixth hospital out-patient and hospitalization during 2012 June to 2013 October.Results Both of the SAS standard score (51.81 ± 11.50) and SDS standard score (62.94 ± 13.06) were significantly related (r=0.125,P＜0.05.r=0.176,P＜0.01) to the reaction time of one-back task ((590.27±213.96)ms),and the correlation between SAS standard score and SDS standard score was significant (r=0.682,P＜0.01).The results of regression analysis suggested that,only SDS score could predict the reaction time of one-back task.Conclusion The emotion of anxiety and depression in patients with depression are correlated with cognitive function,and the emotion of depression is the main factor to affect the cognitive function.