Objective: To understand the prevalence of school bullying and the comorbidity of anxiety and depressive symptoms among middle school students and their association, so as to provide a basis for developing related intervention strategies. Methods: From September to December 2023, a multistage random cluster sampling was employed to select 107 851 middle school students across 104 counties in Anhui Province. The Center for Epidemiological Studies Depression Scale (CES-D) and the Generalized Anxiety Disorder-7 (GAD-7) Scale were used to assess depressive and anxiety symptoms. Logistic regression analysis was utilized to examine the correlations between experiences of school bullying and the comorbidity of anxiety and depressive symptoms. Results: The findings revealed that 2.80% of middle school students had experienced school bullying in the past 30 days. Additionally, 27.03% exhibited potential symptoms of depression, 8.94% showed signs of anxiety symptom, and the comorbidity rate of anxiety and depressive symptoms was 8.04%. Logistic regression analysis showed that statistically significant correlations were identified between experiences of school bullying and increased risks of depressive symptoms (OR=6.42, 95%CI=5.93-6.94, P<0.01), anxiety symptoms (OR=5.94, 95%CI=5.47-6.44, P<0.01), and their comorbidity (OR=6.38, 95%CI=5.88-6.93, P<0.01). Compared with those who did not suffer from school bullying, junior high school students, ordinary senior high school students, vocational senior high school students, boys and girls who suffered from school bullying all had increased risks of comorbidity of anxiety and depressive symptoms (OR=7.25, 5.55, 4.80, 6.42, 6.27, P＜0.01). Conclusions The study underscores the significant impact of school bullying on increasing the risk of comorbidity of anxiety and depressive symptoms among middle school students. It is important to pay attention to the psychological health of bullied students and implement timely psychological intervention measures.

ObjectivesTo compare the clinical efficacy and complications of anatomic locking titanium plate （hereinafter referred to as “titanium plate screw”） and intramedullary nail in the treatment of distal tibial fractures.Methods From September 2019 to September 2021， 32 patients diagnosed with AO-A fracture of distal tibia at Sun Yat-sen Memorial Hospital of Sun Yat-sen University were included in this study. Of these， 15 cases were treated with titanium plate screws and 17 cases were treated with intramedullary nails. General surgical indexes， fracture healing time and postoperative operation were compared between the two groups.ResultsAll patients were followed up for 10 to 20 months， with an average of 12 months. The operative time and intraoperative fluoroscopy times of intramedullary nail group were longer than those of titanium plate screw group， but the preoperative waiting time and hospitalization days was less or were fewer than those of titanium plate screw group， the difference was statistically significant （P < 0.05）. There was no significant difference in fracture healing time between the two groups （P> 0.05）. At 6 weeks after operation， VAS scores in both groups were lower than those before operation， with statistically significant difference （P<0.05）. There was no significant difference in VAS scores between the intramedullary nail group and the titanium plate screw group （P> 0.05）. AOFAS scores 6 months after surgery， ankle joint motion and complication rate 1 year after surgery in intramedullary screw group were better than those in titanium plate screw group， and the differences were statistically significant （P< 0.05）. There was no significant difference in AOFAS scores between the two groups at 1 year after operation （P> 0.05）.ConclusionTitanium plate screw and intramedullary nail are both effective methods for the treatment of distal tibial AO-A fracture， and there is no significant difference in long-term clinical efficacy. Intramedullary nail has fewer soft tissue complications， less impact on ankle motion， faster recovery and higher safety， while titanium plate screw has a higher probability of postoperative soft tissue infection. We suggest that in clinical work， preoperative evaluation of patients should be done well. Under the premise of grasping the indications， intramedullary nail has fewer complications and certain advantages.

Objective:To explore the relationship between the ultrasound parameters of reproductive system and the expression of endocrine hormone in female pediatric patients with precocious puberty(PP),and to assess the treatment effect.Methods:A total of 160 female pediatric patients with PP who admitted to Beijing Jingmei Group General Hospital from January 2021 to December 2021 were selected,and they were divided into a positive group and a normal group based on the diagnostic criteria for precocious puberty,with 80 cases in each group.Ultrasound examination was performed on the uterus,ovaries and breasts of 160 female pediatric patients with PP,and the relevant parameters of them were measured,and the levels of endocrine hormone in the serums of them were detected.The pediatric patients of positive group underwent again the ultrasound examination and the detection of endocrine hormone after they completed treatment.The differences of ultrasound parameters and endocrine hormone between two groups were compared,and the correlation of ultrasound parameters and endocrine hormone between two groups were analyzed,as well as the influence factors of treatment effect.Results:The length and thickness of the uterus,the ratio of the length of the uterus to the length of cervix,the thickness of the endometrium,the size of the ovaries,the number of follicles,and the width and thickness of the hypoechoic area of the breast in the positive group were significantly larger than them in the normal group,and the differences of them were statistical significance(t=16.8,12.6,12.4,14.7,11.5,15.8,10.9,10.2,P<0.05),respectively.The resistance index(RI)of uterine artery of positive group was significantly smaller than that of normal group,and the difference was statistically significant(t=-7.9,P<0.05).The serum estradiol(E2),gonadotropin(GnRH),follicle-stimulating hormone(FSH),luteinizing hormone(LH),progesterone(P)and growth hormone(GH)levels of positive group were significantly higher than those of normal group,and the differences of them were significant(t=20.6,19.8,15.4,17.6,15.2,8.9,P<0.05),respectively.After treatment,the above-mentioned ultrasound parameters and endocrine hormone levels of the pediatric patients in the positive group were significantly improved.The relevant analysis showed that ultrasound parameters were positively correlated with levels of endocrine hormone,and they were important influence factor on the levels of endocrine hormone.In addition,the treatment effect was related to ultrasound parameters(OR=0.78-1.28,P<0.05),the levels of endocrine hormone(OR=0.73-0.77,P<0.05),age,height,weight and BMI(OR=0.70-0.72,P<0.05).Conclusion:The ultrasound parameters of the reproductive system of female pediatric patients with PP are closely related to the expression of endocrine hormones.The levels of endocrine hormones can be used as important indicators of the disease condition and prognosis of female pediatric patients with PP.

Elevated blood pressure is one of the major contributors to cardiovascular disease and premature death. The exposure to ambient fine particulate matter (PM_2.5) is closely associated with changes in blood pressure, and even short-term exposure to PM_2.5 can lead to an increase in blood pressure. PM_2.5 is a complex mixture that exerts different toxicities and triggers increased blood pressure through various mechanisms. Therefore, in this article, we provided a comprehensive review of published studies on the effects of short-term exposure to PM_2.5 and its components on blood pressure, and elaborated potential mechanisms from four aspects, including oxidative stress and inflammatory response, endothelial dysfunction, autonomic nervous system disorders and hypothalamus-pituitary-adrenal axis activation, and epigenome alteration. Given the limitations of existing research, future prospective studies can be conducted on diverse populations, using more precise exposure measurement methods and multi-omics approaches, to further elucidate the mechanisms underlying the effects of PM_2.5 and its various components on blood pressure. The findings would provide a theoretical foundation for effective protection of public health, particularly vulnerable groups.

We investigated whether FTY-720 might have an effect on bleomycin-induced pulmonary fibrosis through inhibiting TGF-β1 pathway, and up-regulating autophagy. The pulmonary fibrosis was induced by bleomycin. FTY-720 (1 mg/kg) drug was intraperitoneally injected into mice. Histological changes and inflammatory factors were observed, and EMT and autophagy protein markers were studied by immunohistochemistry and immunofluorescence. The effects of bleomycin on MLE-12 cells were detected by MTT assay and flow cytometry, and the related molecular mechanisms were studied by Western Blot. FTY-720 considerably attenuated bleomycin-induced disorganization of alveolar tissue, extracellular collagen deposition, and α-SMA and E-cadherin levels in mice. The levels of IL-1β, TNF-α, and IL-6 cytokines were attenuated in bronchoalveolar lavage fluid, as well as protein content and leukocyte count. COL1A1 and MMP9 protein expressions in lung tissue were significantly reduced. Additionally, FTY-720 treatment effectively inhibited the expressions of key proteins in TGF-β1/TAK1/P38MAPK pathway and regulated autophagy proteins. Similar results were additionally found in cellular assays with mouse alveolar epithelial cells. Our study provides proof for a new mechanism for FTY-720 to suppress pulmonary fibrosis. FTY-720 is also a target for treating pulmonary fibrosis.

Background/Aims: The interstitial cells of Cajal (ICC) are pacemaker cells in the gastrointestinal (GI) tract. We examined whether the activity of ICC could be stimulated to control colonic contractions. An optogenetics-based mouse model in which the light-sensitive protein channelrhodopsin-2 (ChR2) was expressed was used to accomplish cell specific, direct stimulation of ICC. Methods: An inducible site-specific Cre-loxP recombination system was used to generate KitCreERT2/+ ;ROSAChR2(H134R)/tdTomato/+ mice in which ChR2(H134R), a variant of ChR2, was genetically expressed in ICC after tamoxifen administration. Genotyping and immunofluorescence analysis were performed to confirm gene fusion and expression. Isometric force recordings were performed to measure changes in contractions in the colonic muscle strips. Results: ChR2 was specifically expressed in Kit-labeled ICC. The isometric force recordings showed that the contractions of the colonic muscle strips changed under 470 nm blue light. Light stimulation evoked premature low-frequency and high amplitude (LFHA) contractions and enhanced the frequency of the LFHA contractions. The light-evoked contractions were blocked by T16Ainh-A01, an antagonist of anoctamin 1 channels that are expressed selectively in ICC in colonic muscles. Conclusions Our study demonstrates a potentially feasible approach to stimulate the activity of ICC by optogenetics. The colonic motor patterns of muscle strips, especially LFHA contractions, can be regulated by 470 nm light via ChR2, which is expressed in ICC.

Dopaminergic neurons in the ventral tegmental area (VTA) play an important role in cognition, emergence from anesthesia, reward, and aversion, and their projection to the cortex is a crucial part of the "bottom-up" ascending activating system. The prelimbic cortex (PrL) is one of the important projection regions of the VTA. However, the roles of dopaminergic neurons in the VTA and the VTA^DA-PrL pathway under sevoflurane anesthesia in rats remain unclear. In this study, we found that intraperitoneal injection and local microinjection of a dopamine D1 receptor agonist (Chloro-APB) into the PrL had an emergence-promoting effect on sevoflurane anesthesia in rats, while injection of a dopamine D1 receptor antagonist (SCH23390) deepened anesthesia. The results of chemogenetics combined with microinjection and optogenetics showed that activating the VTA^DA-PrL pathway prolonged the induction time and shortened the emergence time of anesthesia. These results demonstrate that the dopaminergic system in the VTA has an emergence-promoting effect and that the bottom-up VTA^DA-PrL pathway facilitates emergence from sevoflurane anesthesia.
Anesthesia ; Animals ; Dopaminergic Neurons/metabolism* ; Rats ; Receptors, Dopamine D1/metabolism* ; Sevoflurane/pharmacology* ; Ventral Tegmental Area/metabolism*

Review article is an important part of medical journals. It provides readers with the latest progress and cutting-edge ideas of medical research, which is of great interests for medical workers. An excellent review is not a simple literature listing. The author not only needs to summarize the important findings and highlights in the literature, but also needs to make a fair evaluation of the current research situation, deeply analyze the deficiencies and put forward his/her own unique views. The purpose is to enable readers to fully and accurately understand the research progress in this field, and inspire the readers to explore ideas, grasp the future direction and carry out innovative research. This paper will focus on how to improve the writing level of medical literature review in the process of topic selection, literature collection and screening, data analysis and evaluation.

Background Emerging evidence has shown the damage of air pollution and the benefits of physical activity to human health, and the effects of air pollution and physical activity on the nervous system need more research. Objective To explore the effects of short-term air pollution exposure and physical activity on neural damage biomarkers in healthy elderly. Methods Using a design of panel study, physically and mentally healthy retired employees were recruited from Xinxiang Medical University, and were followed up five times regularly from December 2018 to April 2019. The demographic characteristics and physical activity information were obtained by questionnaire, and the weekly physical activity level was calculated according to intensity and duration of physical activity. Biomarkers of neural damage in serum were measured, including brain-derived neurotrophic factor (BDNF), neurofilament light chain (NF-L), neuron specific enolase (NSE), protein gene product 9.5 (PGP9.5), and S100 calcium-binding protein B (S100B). Air pollution data (including PM_2.5, PM₁₀, O₃, SO₂, CO, and NO₂) of the follow-up period were collected. Generalized estimation equation was used to analyze the association of air pollution concentration and physical activity level with the concentration of neural damage biomarkers. Results A total of 29 volunteers were included in the study, with an average age of (63.5±5.9) years; there were 11 men accounting for 37.93%; more than half of them (62.07%) received above junior middle school education; the mean physical activity level was (80.23±54.51) MET-h·week⁻¹. The daily average concentrations of PM_2.5, PM₁₀, O₃, SO₂, CO, and NO₂ during the study period were (68.27±60.98) μg·m⁻³, (130.57±58.71) μg·m⁻³, (36.86±13.89) μg·m⁻³, (17.86±10.59) μg·m⁻³, (4.94±1.34) mg·m⁻³, and (50.83±8.03) μg·m⁻³, respectively. The average serum concentrations of BDNF, NF-L, NSE, PGP9.5, and S100B were (139.12±46.71) μg·L⁻¹, (402.60±183.31) ng·L⁻¹, (11.26±10.32) ng·L⁻¹, (14.32±13.57) ng·L⁻¹, and (127.57±41.74) ng·L⁻¹, respectively. The results of generalized estimation equation showed that a higher concentration of PM_2.5 or O₃ was associated with increased serum NSE (OR=1.359, 95%CI: 1.224-1.509, P<0.001; OR=1.286, 95%CI: 1.076-1.537, P=0.006), while a higher concentration of NO₂ was associated with decreased serum NSE (OR=0.692, 95%CI: 0.549-0.873, P=0.002); a higher concentration of O₃ or SO₂ was related to the reduction of serum NF-L concentration (OR=0.855, 95%CI: 0.740-0.989, P=0.035; OR=0.813, 95%CI: 0.700-0.946, P=0.007); a higher concentration of NO₂ was associated with decreased PGP9.5 in serum (OR=0.866, 95%CI: 0.777-0.965, P=0.009); a higher level of physical activity was associated with increased serum S100B (OR=1.038, 95%CI: 1.003-1.074, P=0.034); and no significant association of physical activity level or air pollution with BDNF (P>0.05). Conclusion Acute exposure to air pollution and high-level physical activity might affect the neural damage of elderly populations. Specifically, particulate matter (PM_2.5) could increase NSE, while gaseous pollutants (O₃, NO₂, and SO₂) could decrease NF-L and PGP9.5.

Objective:To investigate the safety and dose of 4D template (real-time adjustable angle template) in the treatment of advanced malignant tumors with 125I seeds. Methods:98 patients with advanced malignant tumors admitted to Department of Thoracic Surgery of Shaanxi Provincial Tumor Hospital were treated with 4D template-navigated radioactive 125I seed implantation from June 2018 to December 2019. Preoperative TPS plan, intraoperative optimization, postoperative verification of immediate dose and postoperative evaluation of implantation dose were performed. The treatment results were observed. Results:All 98 patients completed the seed implantation. The implantation dose of GTV of implantation site receiving external irradiation was (12 489±414) cGy and the dose of no external irradiation was (15 036±514) cGy. V 100% was 84.7%-94.1%, and 88.2%-93.7%. The implantation dose of CTV was (7 450±621) cGy, and (9 080±761) cGy. The quality of dose implantation was evaluated as: excellent in 89 cases (91%, 89/98), good in 7 cases (7%, 7/98), fair in 2 cases (2%, 2/98), and poor in 0 case, respectively. The symptom relief rate of patients with pain was 92%(36/39). The 1-and 2-year local control rates were 61%, 36% and 82%, 54% in patients treated with and without external irradiation, respectively. The difference was statistically significant ( P=0.02). The incidence rates of pneumothorax and hemoptysis were 19%(9/48) and 10%(5/48). No corresponding complications were observed in other parts of the patients. Conclusion:4D template-assisted 125I seed therapy is safe and effective for malignant tumors, and intraoperative adjustment of needle angle and dose optimization can realize the precise control of implantation dose.