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Objective@#To construct a risk prediction model for poly victimization (PV) among rural left behind middle and high school students in Chaoshan, and to evaluate the prediction effect of the model, so as to provide scientific basis for early identification and prevention of PV among students.@*Methods@#A questionnaire survey was conducted among 1 005 left behind students, selected from 7 middle and high schools in rural areas of Shantou City and Jieyang City by a stratified random cluster sampling method from January 2020 to September 2021, for the personal, family, external environmental factors, psychological factors (mental resilience, coping approaches, self esteem and social support) and PV situations. R software and Logistic regression were used to screen predictor variables to build a risk prediction model, and the area under the ROC curve (area under the curve, AUC), accuracy, precision, recall, F1 value and calibration curve were used to evaluate the model s effect.@*Results@#The incidence rate of PV among left behind middle and high school students was 23.38%. The results of Logistic regression analysis showed that physical illness or disability ( β =1.02), grade retention during the past year ( β =1.31), having no close partner ( β =1.00), self harm intention (seldom: β = 0.58 , occasionally: β =0.79), negative peer behavior ( β =0.90), family member smoking ( β =0.59), criminal offenses of parents ( β =1.04), witnessing school bullying ( β =0.78), house moving ( β =0.58), using venting ( β =0.34) and the coping style of patience ( β =0.28) were positively correlated with PV among left behind children in Chaoshan area, and family support in psychological flexibility ( β =-0.31) was negatively correlated with PV ( P <0.05). A nomogram prediction model was constructed for the meaningful variables included in the multivariate analysis, and the prediction model AUC was 0.88, the accuracy was 82.00 %, the precision was 77.78%, and the F1 value was 43.75%. The calibration plot fitted well, and the model had good discrimination and calibration.@*Conclusion@#The risk prediction model for left behind middle and high school students with PV has good predictive performance and is helpful for schools and communities to early identify high risk middle and high school students with PV.
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AIM:To explore the modulation of 2-arachidonoylglycerol(2-AG)on A-type potassium channels injured by kainic acid(KA)and its molecular mechanism.METHODS:Primary cultured caudate nucleus(CN)neurons were treated with KA to establish a neuroexcitatory toxicity model.Whole-cell patch clamp recording was performed to ob-serve the changes of electrical activity of A-type potassium channels induced by KA-induced excitatory toxicity and 2-AG-mediated neuroprotective effect.RESULTS:In cultured CN neurons,patch clamp experiments confirmed that KA signifi-cantly decreased the A-type potassium channel current(IA)density and changed the electrical function of CN neurons:the slope(k)of inactivation curve and the recovery time constant(τ)after inactivation of A-type potassium channels in CN neurons were significantly increased.The experiments showed that the increase in 2-AG level,whether using 2-AG direct-ly or application of monoacylglycerol lipase inhibitor URB602 to decrease 2-AG metabolism and increase 2-AG level indi-rectly,inhibited the KA-induced reduction of IA density and the changes of electrical activity of A-type potassium channels through cannabinoid receptor 1(CB1R):2-AG effectively antagonized the KA-induced increases in τ value and k value for inactivation of A-type potassium channels,which accelerated the recovery process after inactivation of the channels.CONCLUSION:The changes of the electrical characteristics of A-type potassium channels may be one of the mecha-nisms of KA-induced excitotoxic injury of CN neurons.The 2-AG plays a neuroprotective role in KA-induced neuroexcit-atory toxic model by regulating the function of A-type potassium channels through CB1R.
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Substances addiction is one of the important factors that deeply affect human health.At present, there is still lack of effective treatment drugs in the clinic.Exploring mechanisms of substances addiction, finding new therapeutic targets and developing effective therapeutic drugs are important issues to be solved.Hyperpolarization-activated cyclic nucleotide gated cation channels (HCN channels) participate in many advanced brain activities and are closely related to the occurrence and progression of various brain diseases.Among them, the researches on the role and mechanism of HCN channels in substances addiction are gradually gaining attention.Reviewing the researches regarding substances addiction, abnormal function and abnormal expression of HCN channels were observed in many brain regions under the condition of psychoactive substances addiction.However, it has not yet been able to fully understand the mechanism and the behavioral consequences of this change.Therefore, we review the neurobiological mechanisms of HCN channels in substances addiction induced by opioids, cocaine, cannabis, amphetamines, alcohol and tobacco, in order to provide new ideas for the mechanism researches and treatment of substance addiction.
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AIM:To analyze the correlation between serum angiotensin-converting enzyme 2 (ACE2) levels and different stages of coronary heart disease (CHD), and to explore the change of serum ACE2 level during the development of CHD.METHODS:The control group included 85 non-CHD samples, and 174 CHD samples were divided into light stenosis (ls-CHD, stenosis degree <50%) group, moderate stenosis (ms-CHD, stenosis degree 50%~75%) group and severe stenosis (ss-CHD, stenosis degree ≥75%) group.The ACE2 level in each serum sample was detected by ELISA.The relationship between the ACE2 level and the development of coronary heart disease was explored by statistical analysis of serum ACE2 levels in different stages of CHD.RESULTS:The serum ACE2 levels in ls-CHD group, ms-CHD group and ss-CHD group were all higher than that in control group.The more severe the coronary artery stenosis existed, the higher the ACE2 level was observed.The serum ACE2 level in the males was higher than that in the females.In a single sex, the serum ACE2 levels in ls-CHD group, ms-CHD group and ss-CHD group were higher than that in control group with significant differences.Regression analysis found that sex, diabetes and CHD were associated with the serum ACE2 levels.Among them, sex and CHD were the independent factors to affect serum ACE2 levels.CONCLUSION:The serum ACE2 level of males was higher than that of females.Compared with the non-CHD samples, the serum ACE2 level of CHD patients was higher than that of the non-CHD samples.During the development of coronary heart disease, the serum ACE2 level increased constantly.
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BACKGROUND:Autologous bone marrow mesenchymal stem cel transplantation for the treatment of cardiovascular disease has become one of the hotspots, but it is unclear whether the proliferation and directional differentiation of autologous bone marrow mesenchymal stem cels varies changes with age. OBJECTIVE: To explore the proliferation and differentiation changes of rat bone mesenchymal stem cels in different ages. METHODS:The bone marrow mesenchymal stem cels from Sprague-Dawley rats in different age groups were purified and cultured, and then examined by flow cytometry in terms of cel cycle. Meanwhile, neonatal rat cardiomyocytes were co-cultured with bone marrow mesenchymal stem cels. The morphologic changes of bone marrow mesenchymal stem cels and the protein expression of troponin T were detected with immunofluorescence technique. RESULTS AND CONCLUSION: The percentage of bone marrow mesenchymal stem cels in G0/G1 phase was increased with age; while the percentage of expression of troponin T proteins-positive bone marrow mesenchymal stem cels were decreased with age. These findings indicate that the proliferation and differentiation abilities of rat bone marrow mesenchymal stem cels descend with age.
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We developed a novel simple microwell plate that allows researchers to culture cells on chips easily without the use of tubes and pumps for studies of cell proliferation, apoptosis and pharmacology. Unlike any other previous design, this device can be put into an incubator directly and maintains cells in an environment with stable temperature, humidity, air pressure, oxygen and CO2 concentration. We cultured PC-12 cells in these microwell plates and measured the cell proliferation and apoptosis. The microwell plate is recommended for use in all research including those involving rare samples and expensive reagents.
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Animales , Ratas , Apoptosis , Técnicas de Cultivo de Célula , Proliferación Celular , Células PC12 , Análisis por Matrices de ProteínasRESUMEN
Objective To observe the effect of motivation of endothelial progenitor cells (EPCs) by granulocyte colony-stimulating factor (G-CSF) on cardiac function in patients with myocardial infarction (MI). Methods Eighty MI patients were sellectedand then were divided into a conventional treatment group (n = 40) and a EPC motivation group (n = 40). EPCs were detected by flow cytometry. Results The rate of EPCs was increased from (0.11 ± 0.04)% in the baseline to (5.32 ± 1.06)% (P 0.05); after treatment, 6MWT, LVEF, and LVEDD were significantly increased in both groups (P 0.05). Conclusions G-CSF can markedly motivate EPCs, which is beneficial for improvement of cardiac function in MI patients.
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AIM:To investigate the effect of atorvastatin on myocardial apoptosis , ventricular remodeling and cardiac function after acute myocardial infarction (AMI) in diabetic rats, and to explore whether the effect is mediated by hepatocyte growth factor ( HGF)/c-Met signaling pathway .METHODS:Diabetes in 70 male SD rats was induced by in-traperitoneal injection of streptozotocin (STZ, 65 mg/kg).After 8 weeks, AMI was induced by the ligation of the left ante-rior descending coronary artery in the diabetic rats , and 32 surviving rats were divided into AMI group (n=16) and AMI+atorvastatin group ( n=16, 20 mg· kg -1 · d-1 ) at random.The similar surgical procedure was completed in sham group (n=11) without coronary ligation.Atorvastatin was given daily by gavage from the first day after AMI .Two weeks later, the cardiac function , pathological changes of myocardial tissues , myocardial apoptosis , and the expression of HGF and c-Met were compared among groups .RESULTS: AMI significantly reduced cardiac function , increased collagen volume fraction ( CVF) and myocardial apoptotic index , and up-regulated the expression of HGF and c-Met at mRNA and protein levels in AMI control group (P<0.05).The cardiac function was improved , and CVF and myocardial apoptotic index were reduced by the treatment with atorvastatin , which also up-regulated the expression of HGF and c-Met (P<0.05).CON-CLUSION:Atorvastatin significantly attenuates myocardial apoptosis and cardiac remodeling , and improves cardiac func-tion after AMI in diabetic rats by further enhancing the activation of HGF /c-Met pathway .
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Objective To perform a systematic review and meta-analysis of the predictive abilities of CHADS2 and CHA2DS2-VASc in stroke and thromboembolism risk stratification of atrial fibrillation (AF) patients. Methods We searched PubMed and EMBASE for Eng-lish-language literature on comparisons of the diagnostic performance between CHADS2 and CHA2DS2-VASc in predicting stroke, or sys-temic embolism, in AF. We then assessed the quality of the included studies and pooled the C-statistics and 95%confidence intervals (95%CI). Results Eight studies were included. It was unsuitable to perform a direct meta-analysis because of high heterogeneity. When analyzed as a continuous variable, the C-statistic ranged from 0.60 to 0.80 (median 0.683) for CHADS2 and 0.64-0.79 (median 0.673) for CHA2DS2-VASc. When analyzed as a continuous variable in anticoagulation patients, the subgroup analysis showed that the pooled C-statistic (95%CI) was 0.660 (0.655-0.665) for CHADS2 and 0.667 (0.651-0.683) for CHA2DS2-VASc (no significant difference). For non-anticoagulation patients, the pooled C-statistic (95%CI) was 0.685 (0.666-0.705) for CHADS2 and 0.675 (0.656-0.694) for CHA2DS2-VASc (no significant differ-ence). The average ratio of endpoint events in the low-risk group of CHA2DS2-VASc was less than CHADS2 (0.41%vs. 0.94%, P＜0.05). The average proportion of the moderate-risk group of CHA2DS2-VASc was lower than CHADS2 (11.12%vs. 30.75%, P＜0.05). Conclu-sions The C-statistic suggests a similar clinical utility of the CHADS2 and CHA2DS2-VASc scores in predicting stroke and thromboem-bolism, but CHA2DS2-VASc has the important advantage of identifying extremely low-risk patients with atrial fibrillation, as well as classi-fying a lower proportion of patients as moderate risk.
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The clinical practice on real patients is more and more difficult in the present condition of the hospitals.The application of the simulating teaching system in clinical cardiovascular teaching can improve the study-activity,and develop studnets'ability to practice.
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To get the mature peptide of human-derived neurotrophin-6 (NT-6), NT-6 gene encoding mature peptide was amplified by PCR, using the NT-6 cDNA that had been cloned as templet. The gene encoding mature peptide of NT-6 gene was cloned into pGEX1-lambdaT plasmid to construct the fusion expression vector. Expression of fusion protein in Escherichia coli was defected after induction by isopropyl beta-D-thiogalactoside(IPTG). The mature peptide of NT-6 was collected with GST fusion protein purifying kit. It was shown that a fragment of 460bp was gained by PCR. With the techniques of double-cleave and electrophoresis, the recombinant vector was identified as pGEX1-NT-6. The recombinant vector pGEX1-NT-6 transformed Escherichia coli expressed fusion protein of 41KD after induction by IPTG. Cleaved by thrombin, the mature peptide of NT-6 was obtained; its molecular weight was about 15KD. The cloning and expression of human-derived NT-6 gene encoding mature protein has provided a basis for further studies on the function and clinical application of NT-6.
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Humanos , Escherichia coli , Genética , Metabolismo , Vectores Genéticos , Genética , Isopropil Tiogalactósido , Farmacología , Factores de Crecimiento Nervioso , Genética , Péptidos , Genética , Proteínas Recombinantes de Fusión , GenéticaRESUMEN
Electrocardiograph(ECG)teaching is always one of the emphases and difficulties in diagnostics teaching.And this article summarizes the experience on ECG teaching reform by using computer assisted instruction(CAI).
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Objective To describe the imaging appearances of mesenteric cavernous hemolymphangioma.Methods The ultrasonography(USG) and CT findings of 5 patients with mesenteric cavernous hemolymphangioma confirmed by operation and pathology were analyzed retrospectively.Results The tumors were reticulate hypoechoic masses on USG,the insides of them were of abundant red or blue blood flows signal on colour Doppler flow imaging(CDFI).On CT,the masses appeared as heterogeneous density with irregular margins and multiple round-like iso-or low dense cystoid foci with asymmetric thickness walls around the lesions.Conclusion The application of CT combined with USG may improve the diagnostic accuracy of mesenteric cavernous hemolymphangioma.
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AIM: To observe the effect of oxymatrine on sodium channel in isolated cardiomyocytes of guinea pig. METHODS: Single ventricular myocytes of guinea pigs were obtained by enzymatic dissociation. The whole - cell patch clamp recording technique was used to record the change of sodium current by different dosage of oxymatrine from 1 to 1 000 ?mol?L-1 . RESULTS: Oxymatrine decreased sodium current in a dose - dependent manner. Oxymatrine (100 ?mol?L-1) decreased the current density by 40% (P
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Objective To discuss the effects of high-fluoride intake and iodine-deficiency on thyroid glands of pregnant mice and their offspring. Methods 200 mg/ L sodium fluoride solution was supplied ad.lib. for the adult female Kunming mice before pregnancy and during pregnancy with iodine-sufficiency and iodine-deficiency. The morphological changes and functions of thyroid glands and the body weights of the pregnant mice and their offspring were observed and measured. Results Under the condition of iodine-sufficiency, significantly higher levels of blood T4 in pregnant mice exposed to high-dose fluoride and their offspring were observed compared with those of control group. Significantly heavier body weights were found in 18 d-pregnant mice and 7 d-old offspring compared with those of control group (P
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AIM: To observe the effect of thichosanthes injection on the expression of proliferating cell nuclear antigen (PCNA) of vascular smooth muscle cell (SMC). METHODS: The expression of PCNA of cultured rabbit aortic SMC was examined with LSAB immunohistochemical technique, and [ 3H]-thymidine([ 3H]-TdR) incorporation data of SMC and the contents of superoxide dismutase (SOD), lipid peroxide (LPO), prostacyclin (PGI 2) and cyclic AMP (cAMP) in medium were simultaneously determined. RESULTS: Thichosanthes injection has an effects of increasing SOD activity, decreasing LPO, elevating PGI 2 and cAMP, reducing [ 3H]-TdR incorporation and expression of PCNA (all P