Objective:To explore the effect of microRNA-101 on apoptosis of condylar cartilage cells and the specific mechanism of molecular biology. Methods: IL-1 was used to stimulate and establish the model of apoptosis of condylar cartilage cells. The expression change of miR-101 in control group was compared with that in IL-1 stimulation group by qRT-PCR. Overexpression and down-regulation models of miR-101 were established by transfecting Mimics and Inhibitor and verified by qRT-PCR. Flow cytometry was used to detect the effect of miR-101 overexpression and down-regulation on apoptosis. Target gene of miR-101 was analyzed and calculated through bioinformatics. Western blot and Luciferase report assay were used to detect whether Sox9 could become the target gene of miR-101. Results:qRT-PCR results showed that IL-1 stimulation could cause the increase of miR-101 expression. After the transfection of rabbit condylar cartilage cells by Mimics and Inhibitor, qRT-PCR results confirmed the significant effect of miR-101 overexpression and down-regulation. It was confirmed by flow cytometry that overexpression of miR-101 could promote the apoptosis of condylar cartilage cells, and down-regulation of miR-101 could reduce the apoptosis. It was confirmed by Western blot and Luciferase report assay that Sox9 was the target gene of miR-101, and miR-101 inhibited SOX9 expression through complementary pairing with 3’UTR of Sox9 mRNA. Conclusions:miR-101 can promote the apoptosis of condylar cartilage cells through inhibiting the protein level of target gene SOX9.

Purpose:To investigate the value of susceptibility-weighted imaging(SWI)in evaluating the histopathologic grade of cerebral astrocytomas.Materials and Methods: 18 patients with histologically proven cerebral astrocytomas,including 7 diffuse astrocytomas,3 ana-plastic astrocytomas and 8 glioblastomas before treatment were involved in this study.The features on SWI were analyzed in 18 cerebral astrocytomas.Results: The veins in the tumors were not detected in 7 diffuse astrocytomas.Slight edema round tumors appeared in all the diffuse astrocytomas.Plenty veins in the tumors and severe edema round the tumors appeared in 3 anaplastic astrocytomas and 8 glioblastomas.The hemorrhagic foci were detected in 1 anaplastic astrocytomas and 6 glioblastomas.The edema round the tumors were moderate or severe in all the anaplastic astrocytomas or glioblastomas.Conclusions: Susceptibility-weighted imaging can provide the informations about blood supply,hemorrhagic focus and edema round the tumors.SWI is very useful for preoperative evaluation of the histopathologic grade of cerebral astrocytomas,especially for evaluation of high or low grade astrocytomas.

Objective To investigate the change characteristics of serum ferritin(SF)and parathormone (PTH)levels in differ-ent stages of chronic kidney disease(CKD)and their correlation with serum beta 2-microglobulin(β2-MG).Methods The levels of serum PTH,SF andβ2-MG in different stages of CKD were detected and the detection results were compared with those in the con-trol group.The correlation between serum SF and PTH withβ2-MG in each stage of CKD was analyzed.Results The level of ser-um PTH,SF andβ2-MG in the compensation group had no statistical difference compared with the control group (P >0.05),while which had statistical differences among the decompensation group,renal failure group and uremia group (P <0.05)The correlation analysis showed that serum PTH was positively correlated with serumβ2-MG in 145 cases(r=0.92,P <0.05),and the serum SF level was also positively correlated with serumβ2-MG level(r=0.92,P <0.05).Conclusion Detecting serum PTH,SF andβ2-MG levels possesses the important clinical significance for understanding CKD condition and prognosis.

Objective To analyse the expression of alpha-fetoprotein variant-L3(AFP-L3)and glypican-3(GPC-3)in primary he-patic carcinoma(PHC)with different concentration of alpha-fetoprotein (AFP),so as to provide references for the diagnosis of PHC.Methods 240 cases of outpatients,inpatients and individuals on physical examination were selected as subjects and serum levels of AFP-L3 and GPC-3 were detected.All of the subjects were divided into negative group(0≤AFP<20 ng/mL),low concen-tration group(20≤AFP<400 ng/mL)and high concentration group(AFP≥400 ng/mL)according to the serum levels of AFP.Ser-um levels of AFP-L3 and GPC-3 were compared among the three groups.And the sensitivity,specificity and accuracy of single de-tection of AFP-L3 or GPC-3 and those of combined detection of AFP-L3 and GPC-3 were compared as well.Results The serum levels of AFP-L3 and GPC-3 in the low concentration group and high concentration group were both higher than those in the nega-tive group,and those in the high concentration group were also higher than those in the low concentration group,had statistically significant differences(P < 0.05 ).The sensitivity,specificity and accuracy of combined detection of AFP-L3 and GPC-3 were 84.4%,95.9% and 93.8% respectively,which were higher than those of single detection of AFP-L3 or GPC-3.Conclusion Com-bined detection of AFP-L3 and GPC-3 could improve the sensitivity,specificity and accuracy for diagnosis of PHC,which has clinical significance for the diagnosis of PHC.

Objectives To explore the correlation between the population characteristics of sero-reactivity with quantitative antibody based-IHA and the transmission parameters,such as epidemic situation,transmission status or infection trend in population.Methods The residents in one endemic administrative village were simultaneously examined by Kato-Katz technique for parasitological stool examination,as well as by immuno-diagnostic technique IHA for detection of IgG antibody against soluble egg antigen for two consecutive years.The results of examination were analyzed and compared on the diagnostic parameters of IHA,the correlation of the changes of positive rates and antibody levels of IHA with the changes of infection trend in population and the distribution of antibody levels between 'the true negative' and 'the true positive'.Results When Kato-Katz technique based on 2 stool samples,each read in 3 thick smears,was used as the reference,the overall sensitivity of IHA was high (from 77.27% to 85.48%) with a relatively poor specificity of lower than 60%,the negative predict value (NPV) was excellent of higher than 94%.The specificity of IHA decreased with the increase of the age in different age-groups of population,showing the highest among the younger less than 15 years old.The distribution trends of positive rates of antibody in different age groups by IHA showed similar to that of egg positive rate detected by Kato-Katz although the positive rates of IHA were higher than these by Kato-Katz,which showed that a higher false positive (from 41.90% to 44.56%) and a certain false negative (from 14.52% to 22.73%)existed in IHA.The positive rate of antibody decreased slowly among the individuals with S.japonicum infection,who received treatment.There was an overlap in the distribution of antibody levels between ' the true negative' and ' the true positive'.Conclusions Under the current schistosomiasis epidemic situation in China,IHA is valuable in the epidemiologic surveys.It should be of further deliberation applying IHA as the screening approaches for identification of target individuals for treatment or determination of the infection rate in community and IHA needs to be combined with the parasitological examination.

Objective: To observe the effects of manganese( Ⅲ ) meso-tetrakis (N, N'-diethylimidazolium-2-yl) porphyrin (MnTDM) in treatment of early Parkinson's disease(PD) mouse model induced by subcutaneous injection of 1-methyl-4-phenyl1, 2, 3, 6-tetrahydropyridine(MPTP) and to discuss its possible mechanism. Methods:Forty male C57BL/6 mice were evenly randomized into 4 groups: MPTP model group(subcutaneous injection of 25 mg/kg MPTP for 3 days), MnTDM+ MPTP group (15 mg/kg MnTDM was subcutaneously injected 1 h before MPTP injection), MnTDM control group, and normal saline group. Performance of animals in the pole and swimming test was observed 3 days after the last injection. Levels of dopamine (DA) and its metabolites(3,4-dihydroxyphenylacetic acid [DOPAC] and homovanillic acid [HVA]) in the striatum of animals were measured by high-performance liquid chromatography with an electrochemical detector(HPLC-ECD). Thiobarbituric acid (TBA) method was used to examine the levels of malondialdehyde(MDA). Results: Acute injection of MPTP could be used for establishment of PD model. The striatal levels of DA, DOPAC and HVA in MPTP group were significantly lower(P＜0.01)and the striatal level of MDA was significantly higher(P＜0.05) than those of the control group. MPTP had no obvious effect on the behavioral performance of the animals in a short term. MnTDM could partly inhibit the above effects of MPTP. Compared with MPTP group, MnTDM+ MPTP group had significantly higher DA, DOPAC, and HVA levels and significantly lower MDA level(all P＜0.05). There was no significant difference in the behavioral indices of animals between the 4 groups. Conclusion:MnTDM can inhibit lipid peroxidation and promote DA production; it has preventive and therapeutic effects on MPTP induced PD.

Objective:To investigate the effects of different lipid-lowering regimens on blood lipids, endothelial function and safety in patients with unstable angina.Methods:Patients who admitted to Henan Provincial People's Hospital for unstable angina from September 2018 to May 2019 were randomly (random number) divided into the conventional treatment group, intensive statin group and intensive lipid-lowering group. Follow-up was performed at 1, 3, and 6 months after treatment according to the predetermined lipid-lowering regimen. Assessments included lipid profile, liver function, muscle enzymes, hypersensitive C-reactive protein (hs-CRP), endothelial function (reactive hyperemia index, RHI), ischemic events, myalgia, and discontinuation. The differences of the follow-up indicators among the three groups were analyzed.Results:A total of 375 patients were enrolled and randomly divided into three groups, 125 patients in each group. There were no significant differences in demographic data and medication among the three groups. At the 1st month, the low density lipoprotein cholesterin (LDL-C) compliance rate of the intensive statin group was significantly higher than those in the conventional treatment group ( χ2=3.939, P=0.047) and the intensive lipid-lowering group ( χ2=4.63, P=0.031). At the 3rd month, the reductions of LDL-C in the intensive statin group and the intensive lipid-lowering group were significantly better than that in the conventional treatment group( P<0.01). At the 6th month, the reduction rate of LDL-C in the intensive lipid-lowering group was higher than that in the intensive statin group ( q=4.332, P<0.01). At the 1st month, the improvement of hs-CRP and RHI in the intensive statin group was significantly better than that in the conventional treatment group( q=4.133, P<0.05). From the 3rd month of treatment, the incidence of cardiovascular events in the intensive statin group and the intensive lipid-lowering group showed a tendency to decrease compared with the conventional treatment group, but no statistically significant difference was found. At the 6th months of treatment, the withdrawal rates were significantly higher in the intensive statin group and the intensive lipid-lowering group than that in the conventional treatment group (χ 2=4.488, P=0.03 and χ2=5.039, P=0.02). There were no significant differences in the ratio of liver enzyme and muscle enzyme elevation and the incidence of myalgia among the three groups (all P>0.05). Conclusions:Intensive statin therapy can make LDL-C reach the standard in patients with unstable angina pectoris as soon as possible, significantly improve inflammation indicators and endothelial function, and has good safety.

INTRODUCTION: Flexible bronchoscopic intubation (FBI) is an important technique in managing an anticipated difficult airway, yet it is rarely performed and has a steep learning curve. We aim to evaluate if the integration of virtual reality gaming application into routine FBI training for emergency department doctors would be more effective than traditional teaching methods. METHODS: We conducted a randomised controlled trial to compare self-directed learning using the mobile application, Airway Ex* in the intervention group versus the control group without use of the mobile application. All participants underwent conventional didactic teaching and low-fidelity simulation with trainer's demonstration and hands-on practice on a manikin for FBI. Participants randomised to the intervention arm received an additional 30 minutes of self-directed learning using Airway Ex, preloaded on electronic devices while the control arm did not. The primary outcome was time taken to successful intubation. RESULTS: Forty-five physicians (20 junior and 25 senior physicians) were enrolled, with male predominance (57.8%, 26/45). There was no difference in time taken to successful intubation (median 48 seconds [interquartile range, IQR 41-69] versus 44 seconds [IQR 37-60], P=0.23) between the control and intervention groups, respectively. However, the intervention group received better ratings (median 4 [IQR 4-5]) for the quality of scope manipulation skills compared to control (median 4 [IQR 3-4], adjusted P=0.03). This difference remains significant among junior physicians in stratified analysis. CONCLUSION Incorporating virtual reality with traditional teaching methods allows learners to be trained on FBI safely without compromising patient care. Junior physicians appear to benefit more compared to senior physicians.

AIM: To investigate drug resistance of Acinetobacter baumannii strains isolated in the hospital from 2018 to 2019, and explore plasmid-mediated delivery of quinolones resistance genes (PMQR) in Acinetobacter baumannii, to provide references for the clinical therapy of infections and to analysis the genetic mechanisms of resistance by aid of molecular methods. METHODS: Bacteria were identified by VITEK-2 compact System, the results of antibiotics susceptibility test was determined by using microdilution method MIC. We amplified genes of qnrA, B, C, D, S, aac(6')-Ib and qepA on plasmid by PCR, and PCR products of each resistant gene for sequencing analysis were random selected. We analyzed the results of antibiotics susceptibility of 152 clinical isolates based on WHONET 5.6 software. RESULTS: In the past two years, 152 strains of Acinetobacter baumannii have been detected from clinical specimens. The antibiotics resistance rate of Acinetobacter baumannii isolates was an increasing trend year by year. PCR indicated that some strains of Acinetobacter baumannii have products of aac(6')-Ib and qnrB gene, 29.6%(45/152) strains carrying aac(6')-Ib and 1.3%(2/152) strains carrying qnrB; there were no products of qnrA, C, D, S and qepA genes on plasmid. CONCLUSION: The current drug-resistance rate among Acinetobacter baumannii strains in Hefei to common antibiotics is high, and PMQR carrying rate is low.

Currently the main treatment of acute myeloid leukemia (AML) is chemotherapy combining hematopoietic stem cell transplantation. However, the unbearable side effect of chemotherapy and the high risk of life-threatening infections and disease relapse following hematopoietic stem cell transplantation restrict its application in clinical practice. Thus, there is an urgent need to develop alternative therapeutic tactics with significant efficacy and attenuated adverse effects. Here, we revealed that umbilical cord-derived mesenchymal stem cells (UC-MSC) efficiently induced AML cell differentiation by shuttling the neutrophil elastase (NE)-packaged extracellular vesicles (EVs) into AML cells. Interestingly, the generation and release of NE-packaged EVs could be dramatically increased by vitamin D receptor (VDR) activation in UC-MSC. Chemical activation of VDR by using its agonist 1α,25-dihydroxyvitamin D3 efficiently enhanced the pro-differentiation capacity of UC-MSC and then alleviated malignant burden in AML mouse model. Based on these discoveries, to evade the risk of hypercalcemia, we synthetized and identified sw-22, a novel non-steroidal VDR agonist, which exerted a synergistic pro-differentiation function with UC-MSC on mitigating the progress of AML. Collectively, our findings provided a non-gene editing MSC-based therapeutic regimen to overcome the differentiation blockade in AML.