To study the effect of chitosan on delayed outward potassium current(IK) in single ventricular myocytes of guinea pig and investigate its antiarrhythmic mechanism from ion channel view. Patch clamp technique with whole-cell configuration. Holding potential was -40mV,commanding potential was -60- + 70mV ,step pulse +10mV,stimulating frequency 1 Hz,duration 300 ms and stimulating interval 6s. The result showed that Chitosan inhibited IK in a dose -dependent manner. Conclusion :Chitosan can inhibite IK in single ventricular myocytes of guinea pig.

AIM To investigate the effect of N methyl berbamine(NMB)on ATP sensitive potassium currents( I KATP )in single ventricular myocytes of guinea pig. METHODS Patch clamp technique with whole cell configuration. Holding potential was -40 mV, commanding potential was -100～+50 mV and duration was 600 ms. Pipette solution contained 0 3 mmol?L -1 ATP. RESULTS NMB inhibited I KATP in a concentration dependent manner. When holding potential was -40 mV and command potential was 0 mV, I KATP were reduced from (0 46?0 09) nA, (0 43?0 15) nA, and(0 47?0 10) nA to (0 37?0 07) nA( n=4,P

BACKGROUNDTo observe the protective effect of hepatitis E virus (HEV) ORF2 recombinant protein expressed in prokaryote cell cynomolgus macaques (cynos) against challenging with wild-type HEV.

METHODSCynos were immunized with HEV ORF2 recombinant protein and then challenged with wild-type HEV, the unimmunized cynos were used as control. Blood samples were collected and tested to see if there were dynamic changes of ALT and antibody to HEV before and after challenge with wild-type HEV.

RESULTSAll the five unimmunized cynos re-presented hepatitis 3 weeks after challenging with wild-type HEV. However, all the five immunized cynos showed no hepatitis and pathological changes.

CONCLUSIONSCynos can be efficiently protected by immunization with HEV ORF2 recombinant protein against wild-type HEV. This protein can be a promising candidate for HEV vaccine.

Animals ; Female ; Hepatitis Antibodies ; blood ; Hepatitis E ; immunology ; prevention & control ; Hepatitis E virus ; immunology ; Macaca mulatta ; Male ; Recombinant Proteins ; immunology ; Viral Proteins ; immunology

OBJECTIVETo analyze a girl with moderate mental retardation and speech and language disorders with cytogenetics technique and next-generation sequencing (NGS).

METHODSG-banding chromosome analysis was used to ascertain the karyotype of the child and her parents, and NGS was used for determining the size and origin of the abnormal chromosome fragment. Mate-pair and PCR were used to determine its parental origin.

RESULTSThe karyotype of the child was determined to be 46,XX,add(1)(q44)dn, while her parents were both normal. NGS revealed that the child has harbored a partial trisomy of 6q24.3-q27, and the breakpoint was mapped to at 6q24.3q27. In addition, a 2.5 Mb microdeletion at 1q44 was found in the patient.

CONCLUSIONNo recognizable phenotype was associated with 1q44 deletion. The abnormal phenotypes presented by the child may be attributed to the 6q24.3-q27 triplication. Compared with conventional cytogenetic analysis, NGS has a much higher resolution and great accuracy.

Adult ; Child ; Chromosome Banding ; Chromosome Disorders ; genetics ; Chromosomes, Human, Pair 1 ; genetics ; Chromosomes, Human, Pair 6 ; genetics ; Female ; Humans ; In Situ Hybridization, Fluorescence ; Intellectual Disability ; genetics ; Male ; Monosomy ; genetics ; Trisomy ; genetics

OBJECTIVE: To explore the effect of arsenic on the homeobox D10( HOXD10) gene expression in peripheral blood lymphocytes and human lung adenocarcinoma cell A549. METHODS: ⅰ) A total of 59 workers exposed to arsenic from a arsenic factory were selected as the exposure group and 17 local people without arsenic exposure were chosen as controls by using judgment sampling method. Hydride generation-cold hydrazine trapping-atomic absorption spectrometry was used to detect arsenic levels in urine of these 2 groups. The expression of HOXD10 in peripheral blood lymphocytes was detected by real-time fluorescent quantitative polymerase chain reaction( qRT-PCR).ⅱ) The A549 cells were treated with arsenic trioxide( As_2O_3) with concentration of 0. 0,0. 1,0. 5,1. 0 and 2. 0 μmol/L,and the survival rate of cells was examined by colorimetric assay. The expression of HOXD10 was detected by qRT-PCR. RESULTS: ⅰ) The levels of inorganic arsenic,methylarsonic acid,dimethyl arsenate,total arsenic in the urine,and the relative expression of HOXD10 mRNA in peripheral blood lymphocyte in exposure group were higher than that of the control group( P < 0. 05).ⅱ) As_2O_3 decreased the survival rate of A549 cells in a dose-dependent manner( P < 0. 01) and lead to a dose-dependent increase of HOXD10 mRNA expression( P < 0. 01). A549 cell survival rate and relative expression of HOXD10 mRNA showed a negative correlation,the correlation coefficient was-0. 777( P < 0. 01). CONCLUSION: Arsenic can up-regulate HOXD10 expression in the peripheral blood of occupational arsenic exposure individuals. As_2O_3 can inhibit the proliferation of A549 cells,which may be related to the up-regulation of HOXD10 expression.

The aim of this study was to develop a semi-quantitative immunochromatographic method for rapid detection of Newcastle disease virus (NDV) antibodies by expressing HN protein in rice endosperm bioreactor. The recombinant plasmid pUC57-HN was digested by MlyⅠ and XhoⅠ to retrieve the HN gene, while the intermediate vector pMP3 containing promoter, signal peptide and terminator was digested by NaeⅠ and XhoⅠ. The HN gene and the linearized pMP3 were purified and ligated to form a recombinant plasmid pMP3-HN1. Subsequently, pMP3-HN1 and plant vector pCAMBIA1300 were digested by EcoRⅠ and Hind Ⅲ, and the HN1 gene was cloned into pCAMBIA1300. The recombinant plasmid pCAMBIA1300-HN1 was introduced into Agrobacterium tumefaciens EHA105 by electrotransformation, and the pCAMBIA1300-HN1 was transferred into rice callus by agrobacterium-mediated method. After dark culture, callus screening, differentiation, rooting and transplanting, transgenic rice seeds were obtained 4 months later. PCR identified that the HN gene has been inserted into the rice genome. SDS-PAGE and Western blotting indicated that the HN protein was successfully expressed in the positive rice endosperm. The purity of the HN protein was more than 90% by SP cation exchange chromatography and gel filtration chromatography. According to the national standards for the diagnostic techniques of Newcastle disease HI test (HI≥4log₂, positive antibody reaction), a colloidal gold labeled purified HN protein was used to prepare a semi-quantitative test strip by double-antibody sandwich method for rapid detection of NDV antibody. The results showed that the test strip did not cross-react with positive sera against other viruses, and the sensitivity of the test strip reached 1:102 400 for standard positive sera of Newcastle disease. Testing of a total of 308 clinical sera showed that the compliance rate of the test strip with HI test was 97.08%, and the Kappa value was 0.942. In conclusion, high purity recombinant HN protein was obtained from rice endosperm, and a simple, rapid, highly sensitive and highly specific semi-quantitative immunochromatographic strip was developed. The test strip could be used for immune evaluation of the Newcastle disease vaccine.
Animals ; Antibodies, Viral ; Chickens ; HN Protein/metabolism* ; Newcastle Disease/prevention & control* ; Newcastle disease virus/metabolism* ; Oryza/genetics*

Objectives: To investigated the safety and efficacy of treating patients with acute non-ST-segment elevation myocardial infarction (NSTEMI) and elevated levels of N-terminal pro-hormone B-type natriuretic peptide (NT-proBNP) with levosimendan within 24 hours of first medical contact (FMC). Methods: This multicenter, open-label, block-randomized controlled trial (NCT03189901) investigated the safety and efficacy of levosimendan as an early management strategy of acute heart failure (EMS-AHF) for patients with NSTEMI and high NT-proBNP levels. This study included 255 patients with NSTEMI and elevated NT-proBNP levels, including 142 males and 113 females with a median age of 65 (58-70) years, and were admitted in the emergency or outpatient departments at 14 medical centers in China between October 2017 and October 2021. The patients were randomly divided into a levosimendan group (n=129) and a control group (n=126). The primary outcome measure was NT-proBNP levels on day 3 of treatment and changes in the NT-proBNP levels from baseline on day 5 after randomization. The secondary outcome measures included the proportion of patients with more than 30% reduction in NT-proBNP levels from baseline, major adverse cardiovascular events (MACE) during hospitalization and at 6 months after hospitalization, safety during the treatment, and health economics indices. The measurement data parameters between groups were compared using the t-test or the non-parametric test. The count data parameters were compared between groups using the χ² test. Results: On day 3, the NT-proBNP levels in the levosimendan group were lower than the control group but were statistically insignificant [866 (455, 1 960) vs. 1 118 (459, 2 417) ng/L, Z=-1.25,P=0.21]. However, on day 5, changes in the NT-proBNP levels from baseline in the levosimendan group were significantly higher than the control group [67.6% (33.8%,82.5%)vs.54.8% (7.3%,77.9%), Z=-2.14, P=0.03]. There were no significant differences in the proportion of patients with more than 30% reduction in the NT-proBNP levels on day 5 between the levosimendan and the control groups [77.5% (100/129) vs. 69.0% (87/126), χ²=2.34, P=0.13]. Furthermore, incidences of MACE did not show any significant differences between the two groups during hospitalization [4.7% (6/129) vs. 7.1% (9/126), χ²=0.72, P=0.40] and at 6 months [14.7% (19/129) vs. 12.7% (16/126), χ²=0.22, P=0.64]. Four cardiac deaths were reported in the control group during hospitalization [0 (0/129) vs. 3.2% (4/126), P=0.06]. However, 6-month survival rates were comparable between the two groups (log-rank test, P=0.18). Moreover, adverse events or serious adverse events such as shock, ventricular fibrillation, and ventricular tachycardia were not reported in both the groups during levosimendan treatment (days 0-1). The total cost of hospitalization [34 591.00(15 527.46,59 324.80) vs. 37 144.65(16 066.90,63 919.00)yuan, Z=-0.26, P=0.80] and the total length of hospitalization [9 (8, 12) vs. 10 (7, 13) days, Z=0.72, P=0.72] were lower for patients in the levosimendan group compared to those in the control group, but did not show statistically significant differences. Conclusions: Early administration of levosimendan reduced NT-proBNP levels in NSTEMI patients with elevated NT-proBNP and did not increase the total cost and length of hospitalization, but did not significantly improve MACE during hospitalization or at 6 months.
Male ; Female ; Humans ; Aged ; Natriuretic Peptide, Brain ; Simendan/therapeutic use* ; Non-ST Elevated Myocardial Infarction ; Heart Failure/drug therapy* ; Peptide Fragments ; Arrhythmias, Cardiac ; Biomarkers ; Prognosis