Objective To investigate the neural proliferation , differentiation and apoptosis of the developing spinal cord of the mouse and to discuss the mechanism of spinal cord ’ s development .Methods 5-Bromodeoxyuridine ( BrdU) assay was used to mark the proliferative neural stem cells , and the immunofluorescent stainings ( DCX, NeuN and Caspase8) were carried out to visualize the newborn neurons , mature cells and apoptotic cells in the spinal cord with 173 mice arrange from E18 to P90.Results BrdU positive neural stem cells appeared evenly in the spinal cord at early days . With age increasing , the neural stem cells differentiated into neuroglial cells and neurons .The newborn neurons in the subventricular zone migrated toward the intermediate zone ( putative gray matter ) and differentiated into mature neurons gradually .With neurons ’ concentrating towards the center , the gray matter formed an “H” shape .In the meantime , with neural differentiation , some apoptotic neurons appeared among the newborn neurons and mature neurons . Double immunostaining showed that most apoptotic neurons were newborn neurons , suggesting the neuroapoptosis more likely occurred in newborn neurons .The statistical data showed that the number of DCX , NeuN and Caspase-8 positive cells reduced with age increasing , suggesting neural differentiation and neuroapoptosis decreased during spinal cord ’ s development .Conclusion Neural proliferation , neural differentiation and neuroapoptosis occur in developing spinal cord . They work together to regulate the formation and development of the spinal cord .

Objective To explore the preventive effectiveness of pulmonary infection of tracheotomy patients received breathing machine with air-bag trachea cannula by inhaling. Methods 108 tracheotomy cases received breathing machine were divided into experimental group (58 cases) and control group (50 cases). The former were carried out by inhaling air-bag trachea cannula, while the htter by common low pressure air-bag trachea cannula. Both were treated according to routine nursing after tracheotomy. Germieulture were carried out from phlegm sampling in tracheal cannula on the third, tenth day after tracheotomy. Results The positive rate of bacterium on the tenth day after tracheotomy was significantly different in two groups. The total strain within both groups were no difference on the third and tenth day after tracheotomy. Pulmonary infection in experimental group were lower than those in control group. Conclusions It is effective to reduce pulmonary infection by using inhaling air-bag trachea cannula.

A method for simultaneous determination of the shikonin, acetyl shikonin and β, β'-dimethylpropene shikonin in Onosma hookeri and the chromatographic fingerprint was estabished by HPLC-DAD on an Agilent Zorbax SB-column with a gradient elution of acetonitrile and water at 0.8 mL x min(-1), 30 degrees C. The quality assessment was conducted by comparing the content difference of three naphthoquinone constituents, in combination with chromatographic fingerprint analysis and systems cluster analysis among 7 batches of radix O. hookeri. The content of the three naphthoquinone constituents showed wide variations in 7 bathces. The similarity value of the fingerprints of sample 5, 6 and 7 was above 0.99, sample 2 and 3 above 0.97, sample 3 and 4 above 0.90, and other samples larger than 0.8, which was in concert with the content of three naphthoquinone constituents. The 7 samples were roughly divided into 4 categories. The results above indicated that the using of this medicine is complex and rather spotty. The established HPLC fingerprints and the quantitative analysis method can be used efficiently for quality assessment of O. hookeri.
Boraginaceae ; chemistry ; Chromatography, High Pressure Liquid ; methods ; Drugs, Chinese Herbal ; analysis ; Naphthoquinones ; analysis ; Plant Roots ; chemistry

Objective ToexploretheapplicationofVasoCT,astentimagingtechnique,instent-assisted coilaneurysmembolization.Methods Twentyconsecutivepatientswith23intracranialaneurysmswere treated with stent-assisted aneurysm embolization in the General Hospital of Armed Police Forces from December 2013 to November 2014 were enrolled. The patients performed VasoCT scan immediately after procedure. Then all the available images were used for stent-optimized reconstruction respectively. Under the XpertCT mode,the available images were observed with both volume imaging and maximum intensity projection. The available images were analyzed and they were divided into very clear,less clear,and not clearaccordingtothestentdevelopingclarity.Results Ofthe22aneurysmstreatedwithstent-assisted embolization,16 were occluded completely,6 were occluded partially. All the stents were expanded completely and were released to the expected locations;11 aneurysm stents developed clearly,9 developed less clearly,and 2didnotdevelopclearly.Conclusion VasoCTcanbeusedinthestent-assistedaneurysmembolization.It can clearly reveal the microscopic structure of the stents,location,relationship with the artery wall,and relationship between stents and coils. The clarity of stent development is associated with the diameters of the packed coils,and the stents are also affected by the metal artifacts projecting direction and the dense degree of the packing coils.

OBJECTIVETo evaluate the feasibility of using iron oxide nanoparticles as gene vector and the effect of magnetic field on efficiency of transfection.

METHODSIron oxide nanoparticles were prepared by alkaline precipitation of divalent and trivalent iron chloride. The surface of iron oxide nanoparticles was modified by self-assembled poly-L-lysine to form particle complexes (IONP-PLL). Transfection was determined by delivering reporter gene, PGL2-control encoding luciferase, to different cell lines using IONP-PLL as vector. The effect of magnetic field on efficiency of transfection was determined using Nd-Fe-B permanent magnet.

RESULTSForeign gene could be delivered to various cell lines by IONP-PLL and expressed with high efficiency, but the transfection efficiency and time course varied in the different cell lines studied. Magnetic field could enhance the efficiency of transfection by 5 - 10 fold.

CONCLUSIONIONP-PLL can be used as a novel non-viral gene vector in vitro, which offers a basis for gene delivery in vivo.

Animals ; COS Cells ; Ferric Compounds ; administration & dosage ; Genetic Vectors ; Magnetics ; Polylysine ; administration & dosage ; Transfection ; methods

Health ; Humans ; Internationality

Objective To investigate the role of liver X receptors (LXRs) on endothelin-1 ( ET-1 )induced murine HL-1 cardiomyocytes hypertrophy.Methods Cutured murine HL-1 cardiomyocytes were divided into four experiment groups:①Control group:treated with DMSO ; ②T0901317 group:treated with LXRs agonist T0901317( 1 μmol/L) ; ③ET-1 group:treated with ET-1 ( 1 nmoL/L) ; ④T0901317 + ET-1 group:treated with T0901317 ( 1 μmol/L) for 8 hours,then treated with ET-1 ( 1 nmol/L).Twenty-four hours later,immunofluorescent staining was performed on HL-1 cells,the surface area of HL-1 cells was analyzed with NIH Image J software,and the synthetic rate of protein in HL-1 cells was detected by 3 H-leucine incorporation.The mRNA level of atrial natriuretic peptide (ANP) and β-myosin heavy chain (β-MyHC ) was measured by quantitative realtime PCR.The effect of T0901317 on mRNA expression of ANP was also detected after LXRs gene silencing.Results The surface area of HL-1 cells,mRNA expression of ANP and β-MyHC,and 3H-leucine incorporation in ET-1 group were 2.00 ± 0.29,1.98 ± 0.47,2.13 ±0.39 and 1.79 ±0.17,respectively,which were singnficantly higher than those of control group ( 1.00 ±0.26,1.00 ±0.21,1.00 ±0.31 and 1.00 ±0.03,respectively,all P ＜0.05).Compared with ET-1 group,the surface area of HL-1 cells,mRNA expression of ANP and β-MyHC,and 3H-leucine incorporation were significantly decreased in T0901317 + ET-1 group ( 1.24 ± 0.25,1.19 ± 0.21,1.48 ± 0.27 and 1.15 ±0.11,respectively,all P ＜ 0.05 ).After inhibition of LXRo/β expression in HL-1 cardiomyocytes using the specific siRNAs,the mRNA expression of ANP in T0901317 + ET-1 group was 1.78 ± 0.05,which was similar as that in ET-1 group ( 1.94 ± 0.17,P ＞ 0.05).Conclusion T0901317,an agonist of LXRs,could inhibit ET-1 induced cardiac hypertrophy in vitro,and LXR Iigand-mediated inhibition on ANP mRNA expression by T0901317 is receptor dependent.

Objective:This study investigates the effect of signal-to-noise ratio (SNR), frequency, and bandwidth on horizontal sound localization accuracy in normal-hearing young adults.Methods:From August 2022 to December 2022, a total of 20 normal-hearing young adults, including 7 males and 13 females, with an age range of 20 to 35 years and a mean age of 25.4 years, were selected to participate in horizontal azimuth recognition tests under both quiet and noisy conditions. Six narrowband filtered noise stimuli were used with central frequencies (CF) of 250, 2 000, and 4 000 Hz and bandwidths of 1/6 and 1 octave. Continuous broadband white noise was used as the background masker, and the signal-to-noise ratio (SNR) was 0, -3, and -12 dB. The root-mean-square error (RMS error) was used to measure sound localization accuracy, with smaller values indicating higher accuracy. Friedman test was used to compare the effects of SNR and CF on sound localization accuracy, and Wilcoxon signed-rank test was used to compare the impact of the two bandwidths on sound localization accuracy in noise.Results:In a quiet environment, the RMS error in horizontal azimuth in normal-hearing young adults ranged from 4.3 to 8.1 degrees. Sound localization accuracy decreased with decreasing SNR: at 0 dB SNR (range: 5.3-12.9 degrees), the difference from the quiet condition was not significant ( P>0.05); however, at -3 dB (range: 7.3-16.8 degrees) and -12 dB SNR (range: 9.4-41.2 degrees), sound localization accuracy significantly decreased compared to the quiet condition (all P<0.01). Under noisy conditions, there were differences in sound localization accuracy among stimuli with different frequencies and bandwidths, with higher frequencies performing the worst, followed by middle frequencies, and lower frequencies performing the best, with significant differences (all P<0.01). Sound localization accuracy for 1/6 octave stimuli was more susceptible to noise interference than 1 octave stimuli (all P<0.01). Conclusions:The ability of normal-hearing young adults to localize sound in the horizontal plane in the presence of noise is influenced by SNR, CF, and bandwidth. Noise with SNRs of ≥-3 dB can lead to decreased accuracy in narrowband sound localization. Higher CF signals and narrower bandwidths are more susceptible to noise interference.

The purpose of this study was to compare the detection of trisomy 8 in myelodysplastic syndrome (MDS) patients with interphase fluorescence in situ hybridization (FISH) and cytogenetic karyotype analysis. Using Spectrum Green labeled chromosome 8 centromere probe, interphase FISH was established. The trisomy 8 clones were simultaneously detected in 48 MDS cases with FISH and conventional cytogenetic analysis (CCA). Results showed that the CCA revealed no significant difference of constitutional proportion between MDS-RA and MDS-RAEB with karyotypes of whole +8, partial +8 and one +8. With FISH, detectable rates were 66.1% for whole +8. Partial +8 and sole +8 were significantly higher than one +8 and complex +8, respectively. The percentages of trisomy 8 were similar in MDS-RA and MDS-RAEB. Trisomy 8 was detected in 1 of 15 specimens with normal or abnormal karyotype without trisomy 8 by FISH. There was linear correlation between the percentages of partial +8 detected by FISH and CCA. Two patients received CCA and FISH examination at diagnosis and during treatment, the percentage of trisomy 8 was increased with progress of disease. In conclusion, our results showed that FISH is a sensitive and accurate technique to detect trisomy 8 in MDS patients. It can provide contribute to diagnosis, assessment of curative effect and predicting progress of disease in MDS. Clone size of trisomy 8 does not related to classification of MDS, but sole +8 is seems to see in MDS-RA frequently.
Chromosomes, Human, Pair 8 ; genetics ; Humans ; In Situ Hybridization, Fluorescence ; Karyotyping ; Myelodysplastic Syndromes ; genetics ; pathology ; Reproducibility of Results ; Sensitivity and Specificity ; Trisomy

Animals ; Calcium ; metabolism ; Diaphragm ; physiology ; ultrastructure ; Male ; Muscle Contraction ; Rats ; Rats, Sprague-Dawley ; Respiration, Artificial ; Sarcoplasmic Reticulum ; metabolism