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Bao ZD, Wan J, Zhu W, Shen JX, Yang Y, Zhou XY. Differentially Expressed Circulating Long-Noncoding RNAS in Premature Infants with Respiratory Distress Syndrome. Balkan J Med Genet 2023; 26:11-20. [PMID: 37576795 PMCID: PMC10413991 DOI: 10.2478/bjmg-2023-0011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023] Open
Abstract
Purpose Recent studies have addressed the association between lung development and long-noncoding RNAs (lncRNAs). But few studies have investigated the role of lncRNAs in neonatal respiratory distress syndrome (RDS). Thus, this study aimed to compare the expression profile of circulating lncRNAs between RDS infants and controls. Methods 10 RDS infants and 5 controls were enrolled. RDS patients were further divided into mild and severe RDS subgroups. Blood samples were collected for the lncRNA expression profile. Subsequently, differentially expressed lncRNAs were screened out. Bioinformatics analysis was applied to establish a co-expression network of differential lncRNAs and mRNAs, and predict the underlying biological functions. Results A total of 135 differentially expressed lncRNAs were identified, including 108 upregulated and 27 downregulated lncRNAs (fold-change>2 and P<0.05) among the three groups (non-RDS, mild RDS and severe RDS groups). Of these lncRNAs, four were selected as showing higher fold changes and validated by qRT-PCR. ENST00000470527.1, ENST00000504497.1, ENST00000417781.5, and ENST00000440408.5 were increased not only in the plasma of total RDS patients but also in the severe RDS subgroup. Gene Ontology (GO) and Kyoto encyclopedia of genes and genomes (KEGG) analyses showed that differentially expressed lncRNAs may play important roles in RDS through regulating PI3KAkt, RAS, MAPK, and TGF-β signaling pathways. Conclusion The present results found that ENST00000470527.1, ENST00000504497.1, ENST00000417781.5, and ENST00000440408.5 may be invol ved in RDS. This could provide new insight into research of the potential pathophysiological mechanisms of preterm RDS.
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Affiliation(s)
- ZD Bao
- Department of Neonatology, Children’s Hospital of Nanjing Medical University, Nanjing, Jiangsu210008, P.R. China
- Department of Neonatology, Jiangyin People’s Hospital of Nantong University, Jiangyin, Jiangsu214400, P.R. China
| | - J Wan
- Department of Neonatology, Jiangyin People’s Hospital of Nantong University, Jiangyin, Jiangsu214400, P.R. China
| | - W Zhu
- Department of Neonatology, Children’s Hospital of Nanjing Medical University, Nanjing, Jiangsu210008, P.R. China
| | - JX Shen
- Department of Neonatology, Children’s Hospital of Nanjing Medical University, Nanjing, Jiangsu210008, P.R. China
| | - Y Yang
- Department of Neonatology, Children’s Hospital of Nanjing Medical University, Nanjing, Jiangsu210008, P.R. China
| | - XY Zhou
- Department of Neonatology, Children’s Hospital of Nanjing Medical University, Nanjing, Jiangsu210008, P.R. China
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Shen JX, Du WW, Xia YL, Zhang ZB, Yu ZF, Fu YX, Liu SQ. Identification of and Mechanistic Insights into SARS-CoV-2 Main Protease Non-Covalent Inhibitors: An In-Silico Study. Int J Mol Sci 2023; 24:ijms24044237. [PMID: 36835648 PMCID: PMC9959744 DOI: 10.3390/ijms24044237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 02/11/2023] [Accepted: 02/17/2023] [Indexed: 02/25/2023] Open
Abstract
The indispensable role of the SARS-CoV-2 main protease (Mpro) in the viral replication cycle and its dissimilarity to human proteases make Mpro a promising drug target. In order to identify the non-covalent Mpro inhibitors, we performed a comprehensive study using a combined computational strategy. We first screened the ZINC purchasable compound database using the pharmacophore model generated from the reference crystal structure of Mpro complexed with the inhibitor ML188. The hit compounds were then filtered by molecular docking and predicted parameters of drug-likeness and pharmacokinetics. The final molecular dynamics (MD) simulations identified three effective candidate inhibitors (ECIs) capable of maintaining binding within the substrate-binding cavity of Mpro. We further performed comparative analyses of the reference and effective complexes in terms of dynamics, thermodynamics, binding free energy (BFE), and interaction energies and modes. The results reveal that, when compared to the inter-molecular electrostatic forces/interactions, the inter-molecular van der Waals (vdW) forces/interactions are far more important in maintaining the association and determining the high affinity. Given the un-favorable effects of the inter-molecular electrostatic interactions-association destabilization by the competitive hydrogen bond (HB) interactions and the reduced binding affinity arising from the un-compensable increase in the electrostatic desolvation penalty-we suggest that enhancing the inter-molecular vdW interactions while avoiding introducing the deeply buried HBs may be a promising strategy in future inhibitor optimization.
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Affiliation(s)
- Jian-Xin Shen
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming 650091, China
| | - Wen-Wen Du
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming 650091, China
| | - Yuan-Ling Xia
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming 650091, China
| | - Zhi-Bi Zhang
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming 650091, China
- Yunnan Key Laboratory of Stem Cell and Regenerative Medicine, Biomedical Engineering Research Center, Kunming Medical University, Kunming 650500, China
| | - Ze-Fen Yu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming 650091, China
| | - Yun-Xin Fu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming 650091, China
- Human Genetics Center and Department of Biostatistics and Data Science, School of Public Health, The University of Texas Health Science Center, Houston, TX 77030, USA
- Correspondence: (Y.-X.F.); (S.-Q.L.)
| | - Shu-Qun Liu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan University, Kunming 650091, China
- Correspondence: (Y.-X.F.); (S.-Q.L.)
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Liu MT, Shen JX, Li XW, Yang L, Li Y, Sang P, Yang LQ. Study on molecular mechanisms of CD4 dependency and independency of HIV-1 gp120. RSC Adv 2023; 13:6274-6286. [PMID: 36825290 PMCID: PMC9942563 DOI: 10.1039/d3ra00433c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 02/16/2023] [Indexed: 02/25/2023] Open
Abstract
Different HIV-1 strains have different antibody neutralization phenotypes (or CD4-dependencies). However, the molecular mechanisms underlying these differences remain to be elucidated. In this study, we constructed gp120 structural models from the CD4-dependent, neutralization-resistant JR-FL strain and the CD4-independent, neutralization-sensitive R2 strain and carried out several conventional molecular dynamics (MD) simulations and free energy landscape (FEL) constructions. Comparative analyses of the MD simulations and FELs indicated that R2 gp120 had higher global structural flexibility and greater conformational diversity than JR-FL gp120. This provides the preconditions for R2 gp120 to adopt a more open conformation than JR-FL gp120. Essential dynamics (ED) analysis showed that the collective motions of R2 gp120 tend towards an open state while those of JR-FL gp120 tend to retain a closed state. Based on conformational selection theory, R2 gp120's more readily sampled open state makes it more sensitive to neutralizing antibodies (or more CD4-independent) than JR-FL gp120, which may explain why the HIV-1 R2 and JR-FL strains show CD4-independent and -dependent phenotypes, respectively. Our study provides thermodynamic and kinetic insights into the CD4-dependent and -independent molecular mechanisms of HIV-1 gp120 and helps shed light on HIV-1 immune evasion.
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Affiliation(s)
- Meng-Ting Liu
- College of Agriculture and Biological Science, Dali University Dali 671000 China .,Key Laboratory of Bioinformatics and Computational Biology of the Department of Education of Yunnan Province, Dali University Dali 671000 China
| | - Jian-Xin Shen
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, School of Life Sciences, Yunnan UniversityKunmingChina
| | - Xin-Wei Li
- College of Agriculture and Biological Science, Dali University Dali 671000 China .,Key Laboratory of Bioinformatics and Computational Biology of the Department of Education of Yunnan Province, Dali University Dali 671000 China
| | - Li Yang
- College of Mathematics and Computer Science, Dali UniversityDali 671000China
| | - Yi Li
- College of Mathematics and Computer Science, Dali UniversityDali 671000China
| | - Peng Sang
- College of Agriculture and Biological Science, Dali University Dali 671000 China .,Key Laboratory of Bioinformatics and Computational Biology of the Department of Education of Yunnan Province, Dali University Dali 671000 China.,Yunnan Key Laboratory of Screening and Research on Anti-pathogenic Plant Resources from West Yunnan, Dali University Dali 671000 China
| | - Li-Quan Yang
- College of Agriculture and Biological Science, Dali University Dali 671000 China .,Key Laboratory of Bioinformatics and Computational Biology of the Department of Education of Yunnan Province, Dali University Dali 671000 China.,Yunnan Key Laboratory of Screening and Research on Anti-pathogenic Plant Resources from West Yunnan, Dali University Dali 671000 China
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Li R, Xu CQ, Shen JX, Ren QY, Chen DL, Lin MJ, Huang RN, Li CH, Zhong RT, Luo ZH, Ji XY, Wu J. 4-Methoxydalbergione is a potent inhibitor of human astroglioma U87 cells in vitro and in vivo. Acta Pharmacol Sin 2021; 42:1507-1515. [PMID: 33311599 PMCID: PMC8379167 DOI: 10.1038/s41401-020-00560-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 10/19/2020] [Indexed: 02/05/2023] Open
Abstract
Astroglioma is the most common primary tumor in the central nervous system without effective treatment strategies. Temozolomide (TMZ) is a chemotherapeutic drug to treat astroglioma but exhibits low potency and has side effects. Therefore, there is an urgent need to develop new compounds to treat astroglioma. Dalbergia sissoo Roxb was the source of Dalbergia odorifera in traditional Chinese medicine (TCM) and has been clinically used as an anti-tumor medicine. 4-Methoxydalbergione (4MOD) is purified from Dalbergia sissoo Roxb., and shows an inhibitory effect on osteosarcoma, but its effects on astroglioma have not been reported. Here, we evaluate its anti-astroglioma effects on both in vitro and in vivo models. In cultured astroglioma U87 cells, 4MOD inhibited cell proliferation and induced cell apoptosis in a time- and concentration-dependent manner. Compared with TMZ, 4MOD exhibited a tenfold greater potency of anti-astroglioma effects. 4MOD effectively stalled the cell cycle in G2 phase. Transcriptome sequencing (RNA-seq) showed that 4MOD upregulated 158 genes and downregulated 204 genes that are mainly enriched in cell membrane, cell division, cell cycle, p53, TNF, and MAPK signaling pathways, which may underlie its anti-tumor mechanisms. In a nude mouse xenograft model transplanted with U87 cells, 10 mg/kg 4MOD slowed down tumor growth rate, while at 30 mg/kg dose, it reduced tumor size. Collectively, this study demonstrates that 4MOD is a potent native compound that remarkably inhibits U87 astroglioma growth in both in vitro and in vivo models.
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Affiliation(s)
- Ran Li
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China
| | - Chang-Qiong Xu
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China
| | - Jian-Xin Shen
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China
| | - Qiu-Yun Ren
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China
| | - Di-Ling Chen
- Guangdong Institute of Microbiology, Guangzhou, 510070, China
| | - Mian-Jie Lin
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China
| | - Rong-Ni Huang
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China
| | - Chun-Hui Li
- Yueyang Hospital of Traditional Chinese Medicine, Yueyang, 414000, China
| | - Ru-Ting Zhong
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China
| | - Zhi-Hua Luo
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China
| | - Xiao-Yu Ji
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China.
| | - Jie Wu
- Brain Function and Disease Laboratory, Shantou University Medical College, Shantou, 515041, China.
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Han TB, Guo LL, Yang FF, Zhao F, Du WQ, Wang Y, Shen JX, Feng YL, Yang HL, Zhang YW, Wu WW, Wang SP. [Folic acid supplementation before and during pregnancy and the risk of preeclampsia]. Zhonghua Liu Xing Bing Xue Za Zhi 2021; 41:1894-1899. [PMID: 33297657 DOI: 10.3760/cma.j.cn112338-20191218-00895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the relationship between folic acid supplementation and the risk of preeclampsia (PE). Methods: A total of 9 048 pregnant women were selected from the First Hospital of Shanxi Medical University in Taiyuan from March 2012 to September 2016. Among them, 882 pregnant women with PE were divided into case group, and 8 166 pregnant women without PE were divided into control group. Information on demographic characteristics, folic acid supplementation, maternal complications, and other factors were collected by face-to-face interviews after child birth in the hospital. Unconditional logistic regression analyses were used to investigate the relationship between folic acid supplementation and the risk of PE and the effects of pre-pregnancy BMI on the relationship of folic acid supplementation with the risk of PE. Results: Compared with nonusers, folic acid supplement users had reduced risk of PE (OR=0.79, 95%CI: 0.64-0.96). Folic acid supplementation before and during pregnancy were negatively related with the risk of PE (OR=0.63, 95%CI: 0.49-0.81). Pregnant women who used folic acid tablets only or used both folic acid tablets and multivitamin containing folic acid had reduced risk of PE (OR=0.81, 95%CI: 0.66-0.99; OR=0.64, 95%CI: 0.49-0.85). No significant relationship was observed in the multivitamin group. Supplemental folic acid doses of <400, 400, and >400 μg/d were related with reduced risk of PE (OR=0.62, 95%CI: 0.42-0.91; OR=0.81, 95%CI: 0.66-0.99; OR=0.68, 95%CI: 0.49-0.94). After stratified by pre-pregnancy BMI, pregnant women who used folic acid supplementation, those with pre-pregnancy BMI<24.0 kg/m(2) had reduced risk of PE (OR=0.75, 95%CI: 0.59-0.96). However, no significant relationship was observed in women with pre-pregnancy BMI≥24.0 kg/m(2). Conclusions: Folic acid supplementation before and during pregnancy were related with reduced risk of PE. Pre-pregnancy BMI might affect the relationship between folic acid supplementation and the risk of PE. Appropriate folic acid supplementation should be recommend for women with different pre-pregnancy BMI.
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Affiliation(s)
- T B Han
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - L L Guo
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - F F Yang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - F Zhao
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - W Q Du
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Y Wang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - J X Shen
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Y L Feng
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - H L Yang
- Obstetrics and Gynecology, The First Hospital of Shanxi Medical University, Taiyuan 030001, China
| | - Y W Zhang
- Division of Environmental Health Sciences, School of Public Health, Yale University, New Haven, Connecticut 06520, USA
| | - W W Wu
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - S P Wang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
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Abstract
Detailed extraction of retinal vessel morphology is of great significance in many clinical applications. In this paper, we propose a retinal image segmentation method, called MAU-Net, which is based on the U-net structure and takes advantages of both modulated deformable convolution and dual attention modules to realize vessels segmentation. Specifically, based on the classic U-shaped architecture, our network introduces the Modulated Deformable Convolutional (MDC) block as encoding and decoding unit to model vessels with various shapes and deformations. In addition, in order to obtain better feature presentations, we aggregate the outputs of dual attention modules: the position attention module (PAM) and channel attention module (CAM). On three publicly available datasets: DRIVE, STARE and CHASEDB1, we have achieved superior performance to other algorithms. Quantitative and qualitative experimental results show that our MAU-Net can effectively and accurately accomplish the retinal vessels segmentation task.
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Xu PH, Tang F, Wang XW, Wang H, Li SL, Shen JX, Jiang L, Chen S, Wang HY. [Quantitative analysis of the effects of different stimuli on the contraction of gastrocnemius in vivo and in vitro specimen]. Zhongguo Ying Yong Sheng Li Xue Za Zhi 2020; 36:379-384. [PMID: 33167103 DOI: 10.12047/j.cjap.5976.2020.081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To quantitatively analyze the effects of direct and indirect stimuli on the contraction of gastrocnemius in vivo and in vitro specimen by self-programming. METHODS All specimens were divided into four groups: indirect stimuli on specimen in vivo group (n=12), direct stimuli on specimen in vivo group (n=8), indirect stimuli on specimen in vitro group (n=12), direct stimuli on specimen in vitro group (n=8). Indirect stimuli (via sciatic nerve) and direct stimuli (acupuncture needle piercing into gastrocnemius) (stimuli starting from 0 V, cycle 3 s, increment 0.02 V, 150 times) were acted on in vivo and in vitro sciatic nerve gastrocnemius muscle specimen respectively. The effects of electric intensity on the contraction of gastrocnemius were recorded by the experimental system of BL-420F. The data were processed and analyzed by the help of self-programming, to quantitatively obtain key parameters for a single contraction. RESULTS ① For in vivo specimen, compared with direct stimuli, effects of indirect stimuli were as follows: the threshold intensity, half-intensity and maximal intensity of the specimen were smaller (P<0.05); the amplitude was larger, the contraction period was longer, and the rising slope was smaller (P<0.05). ②For in vitro specimen, compared with direct stimuli, effects of indirect stimuli were as follows: the threshold intensity, half-intensity and maximal intensity of indirect stimuli were smaller (P<0.05); the amplitude was larger, the contraction period was longer, and the rising slope was smaller (P<0.05). ③Compared with in vitro specimen, there was no significant difference among all the above parameters of in vivo specimen, with either direct or indirect stimuli (P>0.05). CONCLUSION There is no significant difference in the features of single contraction between in vivo and in vitro specimen with either direct or indirect stimuli. However, indirect stimuli can trigger gastrocnemius to produce single contraction more easily than direct stimuli, and the amplitude is larger than that of direct stimuli.
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Affiliation(s)
- Pei-Hong Xu
- Shantou University Medical Collegee, Shantou 515041, China
| | - Feng Tang
- Shantou University Medical Collegee, Shantou 515041, China
| | - Xue-Wei Wang
- Shantou University Medical Collegee, Shantou 515041, China
| | - Huan Wang
- Shantou University Medical Collegee, Shantou 515041, China
| | - Shao-Lei Li
- Shantou University Medical Collegee, Shantou 515041, China
| | - Jian-Xin Shen
- Lab of Medical Functional Sciences, Shantou University Medical College, Shantou 515041, China
- Department of Physiology, Shantou University Medical College, Shantou 515041, China
| | - Ling Jiang
- Lab of Medical Functional Sciences, Shantou University Medical College, Shantou 515041, China
| | - Sui Chen
- Lab of Medical Functional Sciences, Shantou University Medical College, Shantou 515041, China
| | - Hai-Yan Wang
- Department of Pathophysiology, Shantou University Medical College, Shantou 515041, China
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Yang LQ, Yin YR, Shen JX, Li Y, Liu SQ, Sang P. Insight derived from molecular dynamics simulation into cold-adaptation mechanism of trypsins. J Biomol Struct Dyn 2020; 38:2768-2776. [DOI: 10.1080/07391102.2019.1635529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Li-Quan Yang
- College of Agriculture and Biological Science, Dali University, Dali, P. R. China
- Collaborative Innovation Center for Biodiversity and Conservation in the Three Parallel Rivers Region of China, Dali University, Dali, P.R. China
| | - Yi-Rui Yin
- College of Agriculture and Biological Science, Dali University, Dali, P. R. China
| | - Jian-Xin Shen
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, P.R. China
| | - Yi Li
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, P.R. China
| | - Shu-Qun Liu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, P.R. China
| | - Peng Sang
- College of Agriculture and Biological Science, Dali University, Dali, P. R. China
- Collaborative Innovation Center for Biodiversity and Conservation in the Three Parallel Rivers Region of China, Dali University, Dali, P.R. China
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Lu PP, Shen JX, Shang DS, Sun Y. Nonvolatile Memory and Artificial Synapse Based on the Cu/P(VDF-TrFE)/Ni Organic Memtranstor. ACS Appl Mater Interfaces 2020; 12:4673-4677. [PMID: 31898883 DOI: 10.1021/acsami.9b19510] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We demonstrate a flexible nonvolatile multilevel memory and artificial synaptic devices based on the Cu/P(VDF-TrFE)/Ni memtranstor which exhibits pronounced nonlinear magnetoelectric effects at room temperature. The states of the magnetoelectric voltage coefficient αE of the memtranstor are used to encode binary information. By applying selective electric-field pulses, the states of αE can be switched repeatedly among 2n states (n = 1, 2, 3) in a zero dc bias magnetic field. In addition, the magnetoelectric coefficient is used to act as synaptic weight, and the induced magnetoelectric voltage VME is regarded as postsynaptic potentials (excitatory or inhibitory). The artificial synaptic devices based on the Cu/P(VDF-TrFE)/Ni memtranstor display the long-term potentiation (depression) and spiking-time-dependent plasticity behaviors. The advantages of a simple structure, flexibility, multilevel, and self-biasing make the Cu/P(VDF-TrFE)/Ni organic memtranstor a promising candidate for applications in nonvolatile memory as well as artificial synaptic devices with low energy consumption.
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Affiliation(s)
- Pei-Pei Lu
- Beijing National Laboratory for Condensed Matter Physics and Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100190 , China
| | - Jian-Xin Shen
- Beijing National Laboratory for Condensed Matter Physics and Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , China
| | - Da-Shan Shang
- Institute of Microelectronics , Chinese Academy of Sciences , Beijing 100029 , China
| | - Young Sun
- Beijing National Laboratory for Condensed Matter Physics and Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Physics , Chinese Academy of Sciences , Beijing 100190 , China
- School of Physical Sciences , University of Chinese Academy of Sciences , Beijing 100190 , China
- Songshan Lake Materials Laboratory , Dongguan , Guangdong 523808 , China
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Zhao F, Du WQ, Shen JX, Guo LL, Wang Y, Wang KK, Zhang P, Feng YL, Yang HL, Wang SP, Wu WW, Zhang YW. [Association between maternal dietary intake and the incidence of babies with small for gestational age]. Zhonghua Liu Xing Bing Xue Za Zhi 2019; 40:697-701. [PMID: 31238622 DOI: 10.3760/cma.j.issn.0254-6450.2019.06.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the relations between dietary intake during pregnancy and the incidence of their babies with small for gestational age (SGA). Methods: Data on demographics, dietary intake of protein, fat, and carbohydrates of the pregnant mothers during the first, second and third trimester, were collected. Information related to birth weight and gestational age of the infants were also gathered. A total of 8 102 women, who delivered their babies at the First Affiliated Hospital of Shanxi Medical University from March 2012 to September 2016, were enrolled in this project. Among them, 961 mothers had infants with SGA but the other 7 141 of them having normal infants. Unconditional logistic regression model was used to analyze the effect of dietary nutrient intake on SGA the first, second and third trimester. Results: We found that low dietary intake of protein during the first trimester and following trimesters during pregnancy were positively associated with higher risk of SGA (OR=1.534, 95%CI: 1.217-1.934; OR=1.268, 95%CI: 1.005-1.599; OR=1.310, 95%CI: 1.036-1.655). When adjusting for maternal pre-pregnancy BMI, we found that when mothers were with a pre-pregnancy BMI less than 18.5 or with low maternal intake of protein during the first trimester, positive association with higher risk of SGA (OR=1.872, 95%CI: 1.033-3.395; OR=1.754, 95%CI: 1.125-2.734), was noticed. However, for mothers with a pre-pregnancy BMI between 18.5 and 24.0 or with low protein intake during the first trimester, significant association with higher risk of SGA (OR=1.465, 95%CI: 1.089-1.972) was found. Conclusions: Through our observation, maternal dietary intake during pregnancy seemed to be associated with the risk of SGA but the effects of dietary intake were different, according to the BMI of pre-pregnancy population. Early pregnancy appeares as the key period for dietary intake which may influence the SGA.
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Affiliation(s)
- F Zhao
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - W Q Du
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - J X Shen
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - L L Guo
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Y Wang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - K K Wang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - P Zhang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Y L Feng
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - H L Yang
- Obstetrics and Gynecology, First Affiliated Hospital of Shanxi Medical University, Taiyuan 030001, China
| | - S P Wang
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - W W Wu
- Department of Epidemiology, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Y W Zhang
- Division of Environmental Health Scinces, School of Public Health, Yale University, New Haven, Connecticut 06520, USA
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Huang ZH, Wei PJ, Jiang L, Chen S, Cheng BH, Lin Y, Wu LG, Xu QX, Wu SW, Wang HY, Shen JX. [Effects of Ringer's solution with different concentrations of alcohol on biphasic compound action potentials of frog sciatic nerve trunk]. Zhongguo Ying Yong Sheng Li Xue Za Zhi 2019; 35:232-238. [PMID: 31257805 DOI: 10.12047/j.cjap.5750.2019.050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To quantitatively investigate the effects of Ringer's solution with different concentrations of alcohol (1%~80%) on biphasic compound action potentials (AP) from frog sciatic nerve trunk, and their recoveries from alcohol effects. METHODS Individual segments of frog sciatic nerve trunk with a length of 6 to 8 cm were prepared. Ringer's solution with different concentrations of alcohol (0%, 1%, 2%, 4%, 8%, 16%, 32%, 48%, 64% and 80%) was applied onto the segment of the trunk between the stimulus and ground electrodes via an agent reservoir which was newly armed in a nerve trunk shielded chamber for 5 minutes. The nerve trunk was respectively electro-stimulated to generate the biphasic compound AP which was recorded using the experimental system of BL-420F. This was followed by 5 times washout plus 5 min administration with Ringer's solution before recovery recording of AP. RESULTS Compared to normal Ringer's solution, Ringer's solution with alcohol at ≤4% did not have dramatic impacts on the AP amplitude and conduction velocity, while Ringer's solution with alcohol at ≥8% there was significant decrease in these two parameters. Ringer's solution with alcohol at the conentrations of 16%, 32% and ≥48% could prevent a small proportion (30%), a large proportion (90%) and all (100%) of sciatic nerve trunks, respectively, from generating AP. Washout with normal Ringer's solution after alcohol application at the concentration of ≤32%, AP could totally recover to normal status. While alcohol at the concentration of 48%, 64% and 80%, the probabilities to regenerate APs were 90%, 40% and 0%, and the AP amplitudes were decreased to 60%, 36% and 0%, respectively. After washout, AP conduction velocity showed no difference with alcohol at the concentration of ≤8% when compared with that before washout, while it could not be recovered to normal under alcohol at ≥16%. CONCLUSION Ringer's solution with different concentrations of alcohol exerts different effects on biphasic compound AP amplitude and conduction velocity. Hopefully, our findings could be helpful for the alcoholic usage and its recovery from alcoholic damage.
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Affiliation(s)
- Zhi-Hua Huang
- Department of Clinical Medicine (Undergraduate Student), Shantou University Medical College, Shantou 515041
| | - Pei-Jian Wei
- Department of Clinical Medicine (Undergraduate Student), Shantou University Medical College, Shantou 515041
| | - Ling Jiang
- Lab of Medical Functional Sciences, Shantou University Medical College, Shantou 515041
| | - Sui Chen
- Lab of Medical Functional Sciences, Shantou University Medical College, Shantou 515041
| | - Bi-Hong Cheng
- Department of Clinical Medicine (Undergraduate Student), Shantou University Medical College, Shantou 515041
| | - Ying Lin
- Department of Clinical Medicine (Undergraduate Student), Shantou University Medical College, Shantou 515041
| | - Lin-Geng Wu
- Department of Clinical Medicine (Undergraduate Student), Shantou University Medical College, Shantou 515041
| | - Qiu-Xiong Xu
- Department of Clinical Medicine (Undergraduate Student), Shantou University Medical College, Shantou 515041
| | - Shao-Wei Wu
- Department of Clinical Medicine (Undergraduate Student), Shantou University Medical College, Shantou 515041
| | - Hai-Yan Wang
- Department of Pathophysiology, Shantou University Medical College, Shantou 515041
| | - Jian-Xin Shen
- Lab of Medical Functional Sciences, Shantou University Medical College, Shantou 515041
- Department of Physiology, Shantou University Medical College, Shantou 515041, China
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Xia KK, Shen JX, Huang ZB, Song HM, Gao M, Chen DJ, Zhang SJ, Wu J. Heterogeneity of cannabinoid ligand-induced modulations in intracellular Ca 2+ signals of mouse pancreatic acinar cells in vitro. Acta Pharmacol Sin 2019; 40:410-417. [PMID: 30202013 PMCID: PMC6460482 DOI: 10.1038/s41401-018-0074-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Accepted: 05/20/2018] [Indexed: 02/05/2023] Open
Abstract
We recently reported that a CB2R agonist, GW405833 (GW), reduced both the ACh-induced Ca2+ oscillations and the L-arginine-induced Ca2+ signal enhancement in mouse pancreatic acinar cells, suggesting that GW-induced inhibition may prevent the pathogenesis of acute pancreatitis. In this study, we aim to evaluate the effects of other cannabinoid ligands on Ca2+ signaling in acinar cells. Patch-clamp whole-cell recordings were applied to measure ACh-induced intracellular Ca2+ oscillations in pancreatic acinar cells acutely dissociated from wild-type (WT), CB1R knockout (KO), and CB2R KO mice, and the pharmacological effects of various cannabinoid ligands on the Ca2+ oscillations were examined. We found that all the 8 CB2R agonists tested inhibited ACh-induced Ca2+ oscillations. Among them, GW, JWH133, and GP1a caused potent inhibition with IC50 values of 5.0, 6.7, and 1.2 μmol/L, respectively. In CB2R KO mice or in the presence of a CB2R antagonist (AM630), the inhibitory effects of these 3 CB2R agonists were abolished, suggesting that they acted through the CB2Rs. The CB1R agonist ACEA also induced inhibition of Ca2+ oscillations that existed in CB1R KO mice and in the presence of a CB1R antagonist (AM251), suggesting a non-CB1R effect. In WT, CB1R KO, and CB2R KO mice, a nonselective CBR agonist, WIN55,212-2, inhibited Ca2+ oscillations, which was not mediated by CB1Rs or CB2Rs. The endogenous cannabinoid substance, 2-arachidonoylglycerol (2-AG), did not show an inhibitory effect on Ca2+ oscillations. In conclusion, CB2R agonists play critical roles in modulating Ca2+ signals in mouse pancreatic acinar cells, while other cannabinoid ligands modulate Ca2+ oscillations in a heterogeneous manner through a CB receptor or non-CB-receptor mechanism.
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Affiliation(s)
- Kun-Kun Xia
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
- Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, 8501, USA
| | - Jian-Xin Shen
- Department of Physiology, Shantou University Medical College, Shantou, 515100, China
| | - Ze-Bing Huang
- Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, 8501, USA
| | - Hui-Min Song
- Department of Physiology, Shantou University Medical College, Shantou, 515100, China
| | - Ming Gao
- Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, 8501, USA
| | - De-Jie Chen
- Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, 8501, USA
- Department of Neurology, Yunfu People's Hospital, Yunfu, 527300, China
| | - Shui-Jun Zhang
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China
| | - Jie Wu
- Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, China.
- Department of Neurobiology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, 8501, USA.
- Department of Physiology, Shantou University Medical College, Shantou, 515100, China.
- Department of Neurology, Yunfu People's Hospital, Yunfu, 527300, China.
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Tan J, Han L, Jing YY, Zheng HW, Shen JX, Zhang LH, Yu LS. [Study on the effects of microRNA-203 on the invasion and apoptosis of laryngeal cancer cells via targeting LASP1]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2019; 33:171-175. [PMID: 30808147 DOI: 10.13201/j.issn.1001-1781.2019.02.019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/14/2018] [Indexed: 11/12/2022]
Abstract
Objective: To explore the role of microRNA-203 in laryngeal cancer and its underlying mechanism and clarify the relationship between microRNA-203 and LASP1.Method: microRNA-203 expression in laryngeal cancer tissues and paracancerous tissues was detected by quantitative real time-polymerase chain reaction(qRT-PCR). The regulatory effects of microRNA-203 on invasion and apoptosis of laryngeal cancer cells were detected by Transwell assay and flow cytometry, respectively. Dual-luciferase reporter gene assay was performed to access the binding condition of microRNA-203 and LASP1. Both mRNA and protein levels of LASP1 in laryngeal cancer cells were detected after transfection with microRNA-203 mimic or microRNA-203 inhibitor by qRT-PCR and Western blot. Rescue experiments were finally performed to detect whether microRNA-203 regulates laryngeal cancer development via targeting LASP1. Result: microRNA-203 was lowly expressed in laryngeal cancer tissues and cell lines.Knockdown of microRNA-203 in Hep-2 cells can promote the invasiveness and inhibit apoptosis of laryngeal cancer cells. Subsequently,LASP1 was predicted to be the target gene of microRNA-203,which was further verified by dual-luciferase reporter gene assay.LASP1 expression was negatively regulated by microRNA-203. Furthermore,rescue experiments showed that microRNA-203 regulates invasion and apoptosis of laryngeal cancer cells via targeting LASP1. Conclusion: Low expression of microRNA-203 could promote the invasion and inhibit apoptosis of laryngeal cancer cells viainhibiting LASP1. microRNA-203 and LASP1 both play a very important role in the development of laryngeal cancer..
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Affiliation(s)
- J Tan
- Department of Otolaryngology Head and Neck Surgery,People's Hospital,Peking University,Beijing,100044,China
| | - L Han
- Department of Otolaryngology Head and Neck Surgery,People's Hospital,Peking University,Beijing,100044,China
| | - Y Y Jing
- Department of Otolaryngology Head and Neck Surgery,People's Hospital,Peking University,Beijing,100044,China
| | - H W Zheng
- Department of Otolaryngology Head and Neck Surgery,People's Hospital,Peking University,Beijing,100044,China
| | - J X Shen
- Department of Otolaryngology Head and Neck Surgery,People's Hospital,Peking University,Beijing,100044,China
| | - L H Zhang
- Department of Otolaryngology Head and Neck Surgery,People's Hospital,Peking University,Beijing,100044,China
| | - L S Yu
- Department of Otolaryngology Head and Neck Surgery,People's Hospital,Peking University,Beijing,100044,China
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Tan J, Jing YY, Han L, Zheng HW, Liu Y, Geng CL, Diao TX, Wang L, Li XS, Zhao YX, Shen JX, Yu LS. [The study about the role of laryngopharyngeal reflux for the hemorrhage after tonsillectomy]. Lin Chung Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 32:1387-1390. [PMID: 30550168 DOI: 10.13201/j.issn.1001-1781.2018.18.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Indexed: 11/12/2022]
Abstract
Objective:To assess the role of LPR in the development of complications, such as hemorrhage, following tonsillectomy in adult patients. We want to provide a guidence for future clinical practice.Method:Totally 70 adult patients who had indication of tonsillectomy were recruited and divided into two groups, the laryngopharyngeal reflux (LPR) group and the control group, which were identified by the results of Reflux Symptom Index (RSI) and Reflux Finding Score (RFS). We observed and compared the postoperative complications of the two groups and analyzed the role of LPR.Result:All the patients complained pain after surgery. The duration of the pain in LPR group was much longer than that of control group. The mean body temperature in both groups was not significantly different (P>0.05). There were six cases of bleeding in the LPR group, while only one case of bleeding occurred in the control group. The difference was statistically significant (P<0.05). There were no cases of infection or pulmonary complications in both groups. All patients were discharged successfully.Conclusion:LPR is closely related to the complications following tonsillectomy.
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Affiliation(s)
- J Tan
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - Y Y Jing
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - L Han
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - H W Zheng
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - Y Liu
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - C L Geng
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - T X Diao
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - L Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - X S Li
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - Y X Zhao
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - J X Shen
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
| | - L S Yu
- Department of Otorhinolaryngology Head and Neck Surgery, Peking University, People's Hospital, Beijing,100023,China
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Shen JX, Shang DS, Chai YS, Wang SG, Shen BG, Sun Y. Mimicking Synaptic Plasticity and Neural Network Using Memtranstors. Adv Mater 2018; 30:e1706717. [PMID: 29399893 DOI: 10.1002/adma.201706717] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 12/18/2017] [Indexed: 06/07/2023]
Abstract
Artificial synaptic devices that mimic the functions of biological synapses have drawn enormous interest because of their potential in developing brain-inspired computing. Current studies are focusing on memristive devices in which the change of the conductance state is used to emulate synaptic behaviors. Here, a new type of artificial synaptic devices based on the memtranstor is demonstrated, which is a fundamental circuit memelement in addition to the memristor, memcapacitor, and meminductor. The state of transtance (presented by the magnetoelectric voltage) in memtranstors acting as the synaptic weight can be tuned continuously with a large number of nonvolatile levels by engineering the applied voltage pulses. Synaptic behaviors including the long-term potentiation, long-term depression, and spiking-time-dependent plasticity are implemented in memtranstors made of Ni/0.7Pb(Mg1/3 Nb2/3 )O3 -0.3PbTiO3 /Ni multiferroic heterostructures. Simulations reveal the capability of pattern learning in a memtranstor network. The work elucidates the promise of memtranstors as artificial synaptic devices with low energy consumption.
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Affiliation(s)
- Jian-Xin Shen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- School of Physical Science, University of Chinese Academy of Sciences, Beijing, 100190, China
| | - Da-Shan Shang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Yi-Sheng Chai
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Shou-Guo Wang
- Institute of Advanced Materials, Beijing Normal University, Beijing, 100875, China
| | - Bao-Gen Shen
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Young Sun
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- School of Physical Science, University of Chinese Academy of Sciences, Beijing, 100190, China
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Li Y, Wang YP, Shen JX, Zhang JG, Zhao Y, Yu B. [Relationship of preoperative coronal intervertebral angle changes in the lumbosacral region with postoperative trunk shift after congenital scoliosis surgery]. Zhonghua Yi Xue Za Zhi 2016; 96:20-4. [PMID: 26792602 DOI: 10.3760/cma.j.issn.0376-2491.2016.01.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVES To investigate the relationship between the preoperative coronal intervertebral angle changes and postoperative trunk shift (TS) in patients who received congenital scoliosis correction. METHODS The data of 921 patients with congenital scoliosis, who received posterior congenital scoliosis correction and internal fixation, was retrospectively analyzed. Anteroposterior (AP) whole spine standing radiographs and right and left lateral bending radiographs were taken preoperatively, and AP whole spine standing radiographs were obtained postoperatively and at the final follow-up. TS was measured in the coronal plane, and intervertebral angle change was the sum of the absolute values of L4-S1 intervertebral angle changes in the coronal plane, and was determined before surgery, postoperatively, and at final follow-up. RESULTS A total of 38 patients with a mean age of 16.42±8.36 years old and a mean follow-up of 12.4 months (range, 6 to 36 months) were included. A median negative correlation were found between TS at the final follow-up and total variance of bending (r=-0.51, P=0.001). Groups were defined by two methods: coronal intervertebral angle changes ≥10° or <10°, and final follow-up TS < 20 mm or ≥ 20 mm. TS at the final follow-up was significantly greater in the <10° group than the ≥10° group (32.45 vs 12.44 mm, P=0.001), and coronal intervertebral angle changes was significantly greater in the TS < 20 mm group than the ≥ 20 mm group (14.2° vs 6°, P=0.001). CONCLUSION Postoperative TS which will not compensate spontaneously can be predicted by measurement of the preoperative intervertebral interspace angle in the congenital scoliosis lumbosacral region.
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Affiliation(s)
- Y Li
- Department of Orthopeadics, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730, China
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Zhang SM, Shen JX, Li H, Zhao P, Xu G, Chen JC. Association between serum corin levels and risk of acute myocardial infarction. Clin Chim Acta 2016; 452:134-7. [DOI: 10.1016/j.cca.2015.11.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 11/05/2015] [Accepted: 11/10/2015] [Indexed: 11/30/2022]
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Wu J, Gao M, Shen JX, Qiu SF, Kerrigan JF. Mechanisms of intrinsic epileptogenesis in human gelastic seizures with hypothalamic hamartoma. CNS Neurosci Ther 2014; 21:104-11. [PMID: 25495642 DOI: 10.1111/cns.12348] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Revised: 10/07/2014] [Accepted: 10/08/2014] [Indexed: 12/24/2022] Open
Abstract
Human hypothalamic hamartoma (HH) is a rare developmental malformation often characterized by gelastic seizures, which are refractory to medical therapy. Ictal EEG recordings from the HH have demonstrated that the epileptic source of gelastic seizures lies within the HH lesion itself. Recent advances in surgical techniques targeting HH have led to dramatic improvements in seizure control, which further supports the hypothesis that gelastic seizures originate within the HH. However, the basic cellular and molecular mechanisms of epileptogenesis in this subcortical lesion are poorly understood. Since 2003, Barrow Neurological Institute has maintained a multidisciplinary clinical program to evaluate and treat patients with HH. This program has provided a unique opportunity to investigate the basic mechanisms of epileptogenesis using surgically resected HH tissue. The first report on the electrophysiological properties of HH neurons was published in 2005. Since then, ongoing research has provided additional insights into the mechanisms by which HH generate seizure activity. In this review, we summarize this progress and propose a cellular model that suggests that GABA-mediated excitation contributes to epileptogenesis in HH lesions.
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Affiliation(s)
- Jie Wu
- Division of Neurology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ, USA; Department of Physiology, Shantou University of Medical College, Shantou, Guangdong, China; Department of Basic Medical Sciences, University of Arizona College of Medicine-Phoenix, Phoenix, AZ, USA
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Ma LY, Wu C, Jin Y, Gao M, Li GH, Turner D, Shen JX, Zhang SJ, Narayanan V, Jentarra G, Wu J. Electrophysiological phenotypes of MeCP2 A140V mutant mouse model. CNS Neurosci Ther 2014; 20:420-8. [PMID: 24750778 DOI: 10.1111/cns.12229] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 12/27/2013] [Accepted: 01/03/2014] [Indexed: 11/27/2022] Open
Abstract
AIMS MeCP2 gene mutations are associated with Rett syndrome and X-linked mental retardation (XLMR), diseases characterized by abnormal brain development and function. Recently, we created a novel MeCP2 A140V mutation mouse model that exhibited abnormalities of cell packing density and dendritic branching consistent with that seen in Rett syndrome patients as well as other MeCP2 mutant mouse models. Therefore, we hypothesized that some deficits of neuronal and synaptic functions might also be present in the A140V mutant model. METHODS Here, we tested our hypothesis in hippocampal slices using electrophysiological recordings. RESULTS We found that in young A140V mutant mice (3- to 4-week-old), hippocampal CA1 pyramidal neurons exhibited more positive resting membrane potential, increased action potential (AP) firing frequency induced by injection of depolarizing current, wider AP duration, and smaller after hyperpolarization potential compared to neurons prepared from age-matched wild-type mice, suggesting a neuronal hyperexcitation. At the synaptic level, A140V mutant neurons exhibited a reduced frequency of spontaneous IPSCs (inhibitory postsynaptic potentials) and an enhanced probability of evoked glutamate release, both suggesting neuronal hyperexcitation. However, hippocampal CA1 long-term potentiation was not significantly different between A140V and WT mice. In adult mice (11- to 13-month-old), in addition to neuronal hyperexcitation, we also found significant deficits of both short-term and long-term potentiation of CA3-CA1 synapses in A140V mice compared to WT mice. CONCLUSIONS These results clearly illustrate the age-dependent abnormalities of neuronal and synaptic function in the MeCP2 A140V mutant mouse model, which provides new insights into the understanding of the pathogenesis of Rett syndrome.
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Wang L, Wang YP, Yu B, Zhang JG, Shen JX, Qiu GX, Li Y. Relation between self-image score of SRS-22 with deformity measures in female adolescent idiopathic scoliosis patients. Orthop Traumatol Surg Res 2014; 100:797-801. [PMID: 25282478 DOI: 10.1016/j.otsr.2014.06.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 05/23/2014] [Accepted: 06/25/2014] [Indexed: 02/02/2023]
Abstract
BACKGROUND Adolescent idiopathic scoliosis (AIS) is a pathology which affects the individual's functioning in the widely understood physical, psychic, and social aspects. More attention should be paid to patients' perception of self-image when evaluating the spine deformity. The present retrospective study evaluated the associations between the deformity measures and self-image score as determined by the SRS-22 questionnaire in Chinese female AIS patients. HYPOTHESIS The self-image score correlates significantly with deformity measures. The location of main curve apex and the number of curve could affect the self-image score. MATERIALS AND METHODS We retrospectively reviewed the records of 202 female patients, collected data on patient's age, body mass index, radiographic and physical measures and self-image score of SRS-22 questionnaire. According to the location of main curve apex and the number of curve, the patients were divided to different subgroups. Correlations between deformity measures and self-image score of different groups were evaluated by the Spearman correlation test. RESULTS The self-image score correlated negatively with the main Cobb angle, apical vertebral translation (AVT), and razor hump height. There is no significant difference of self-image score between thoracic curve (TC) and thoracolumbar curve (TL/LC) subgroups. And the self-image scores of one-curve, two-curve and three-curve subgroups are similar. DISCUSSION For Chinese female AIS patients in our study, self-image was found to correlate negatively with the main Cobb angle, AVT and razor hump height. And the location of scoliosis apex and the number of curve are not influencing factors of self-image perception. LEVEL OF EVIDENCE Level IV, retrospective study.
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Affiliation(s)
- L Wang
- Department of Orthopedic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Shuaifuyuan-Hutong, Beijing, 100730, China
| | - Y P Wang
- Department of Orthopedic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Shuaifuyuan-Hutong, Beijing, 100730, China.
| | - B Yu
- Department of Orthopedic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Shuaifuyuan-Hutong, Beijing, 100730, China
| | - J G Zhang
- Department of Orthopedic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Shuaifuyuan-Hutong, Beijing, 100730, China
| | - J X Shen
- Department of Orthopedic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Shuaifuyuan-Hutong, Beijing, 100730, China
| | - G X Qiu
- Department of Orthopedic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Shuaifuyuan-Hutong, Beijing, 100730, China
| | - Y Li
- Department of Orthopedic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Shuaifuyuan-Hutong, Beijing, 100730, China
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Wang JK, Zhao MQ, Sun NN, Sun FF, Wu J, Shen JX, Wang HY. [Laser scanning confocal microscopic imaging for Ca2 + oscillations of pancreatic acinar cells in mice]. Zhongguo Ying Yong Sheng Li Xue Za Zhi 2014; 30:373-377. [PMID: 25330680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE To establish a simple but effective method of laser scanning confocal microscopic imaging for Ca2+ oscillations of pancreatic acinar cells in adult mice. METHODS Pancreatic acinar cells from adult Kunming mice were isolated acutely with collagenase, and then loaded with fluo-4-AM, a Ca2+ indicator. A laser scanning confocal microscope armed with 488 nm laser was employed to record the dynamic fluorescent signals in-time and synchronously while acetylcholine (ACh) was added in the pancreatic acinar cells. RESULTS (1) The classic pancreatic acinar cell Ca2+ oscillations were induced by a certain concentration of ACh (100 nmol/L) successfully and steadily, which could be blocked by atropine completely. (2) Plasmic Ca2+ oscillations from different parts of one acinar cell were usually with different amplitudes and almost the same frequencies. But both of amplitudes and frequencies were different among different cells. (3) The acinar cell Ca2+ oscillations were induced by ACh in a concentration-dependent manner. CONCLUSION The laser scanning confocal microscopic imaging for adult mouse pancreatic acinar cell Ca2+ oscillations was established successfully. The features of being easy to use, direct to see lively, high efficiency and good flexibility make it a popular tool for researchers to choose.
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Wu J, Gao M, Shen JX, Shi WX, Oster AM, Gutkin BS. Cortical control of VTA function and influence on nicotine reward. Biochem Pharmacol 2013; 86:1173-80. [PMID: 23933294 DOI: 10.1016/j.bcp.2013.07.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Revised: 07/15/2013] [Accepted: 07/16/2013] [Indexed: 02/05/2023]
Abstract
Tobacco use is a major public health problem. Nicotine acts on widely distributed nicotinic acetylcholine receptors (nAChRs) in the brain and excites dopamine (DA) neurons in the ventral tegmental area (VTA). The elicited increase of DA neuronal activity is thought to be an important mechanism for nicotine reward and subsequently the transition to addiction. However, the current understanding of nicotine reward is based predominantly on the data accumulated from in vitro studies, often from VTA slices. Isolated VTA slices artificially terminate communications between neurons in the VTA and other brain regions that may significantly alter nicotinic effects. Consequently, the mechanisms of nicotinic excitation of VTA DA neurons under in vivo conditions have received only limited attention. Building upon the existing knowledge acquired in vitro, it is now time to elucidate the integrated mechanisms of nicotinic reward on intact systems that are more relevant to understanding the action of nicotine or other addictive drugs. In this review, we summarize recent studies that demonstrate the impact of prefrontal cortex (PFC) on the modulation of VTA DA neuronal function and nicotine reward. Based on existing evidence, we propose a new hypothesis that PFC-VTA functional coupling serves as an integration mechanism for nicotine reward. Moreover, addiction may develop due to nicotine perturbing the PFC-VTA coupling and thereby eliminating the PFC-dependent cognitive control over behavior.
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Affiliation(s)
- Jie Wu
- Divisions of Neurology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, AZ 85013-4496, USA; Departments of Physiology, Shantou University Medical College, Shantou, Guangdong, China.
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Jin Y, Su QX, Shen JX, Marks MJ, Wu J. Impaired hippocampal theta oscillations in the mice null alpha7 nicotinic acetylcholine receptors. CNS Neurosci Ther 2013; 19:721-3. [PMID: 23795917 DOI: 10.1111/cns.12138] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2013] [Revised: 05/18/2013] [Accepted: 05/19/2013] [Indexed: 02/03/2023] Open
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Liu Q, Emadi S, Shen JX, Sierks MR, Wu J. Human α4β2 nicotinic acetylcholine receptor as a novel target of oligomeric α-synuclein. PLoS One 2013; 8:e55886. [PMID: 23437071 PMCID: PMC3577813 DOI: 10.1371/journal.pone.0055886] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Accepted: 01/07/2013] [Indexed: 12/22/2022] Open
Abstract
Cigarette smoking is associated with a decreased incidence of Parkinson disease (PD) through unknown mechanisms. Interestingly, a decrease in the numbers of α4β2 nicotinic acetylcholine receptors (α4β2-nAChRs) in PD patients suggests an α4β2-nAChR-mediated cholinergic deficit in PD. Although oligomeric forms of α-synuclein have been recognized to be toxic and involved in the pathogenesis of PD, their direct effects on nAChR-mediated cholinergic signaling remains undefined. Here, we report for the first time that oligomeric α-synuclein selectively inhibits human α4β2-nAChR-mediated currents in a dose-dependent, non-competitive and use-independent manner. We show that pre-loading cells with guanyl-5'-yl thiophosphate fails to prevent this inhibition, suggesting that the α-synuclein-induced inhibition of α4β2-nAChR function is not mediated by nAChR internalization. By using a pharmacological approach and cultures expressing transfected human nAChRs, we have shown a clear effect of oligomeric α-synuclein on α4β2-nAChRs, but not on α4β4- or α7-nAChRs, suggesting nAChR subunit selectivity of oligomeric α-synuclein-induced inhibition. In addition, by combining the size exclusion chromatography and atomic force microscopy (AFM) analyses, we find that only large (>4 nm) oligomeric α-synuclein aggregates (but not monomeric, small oligomeric or fibrillar α-synuclein aggregates) exhibit the inhibitory effect on human α4β2-nAChRs. Collectively, we have provided direct evidence that α4β2-nAChR is a sensitive target to mediate oligomeric α-synuclein-induced modulation of cholinergic signaling, and our data imply that therapeutic strategies targeted toward α4β2-nAChRs may have potential for developing new treatments for PD.
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Affiliation(s)
- Qiang Liu
- Divisions of Neurology, Barrow Neurological Institute, St. Joseph’s Hospital and Medical Center, Phoenix, Arizona, United States of America
| | - Sharareh Emadi
- Department of Chemical Engineering, Arizona State University, Tempe, Arizona, United States of America
| | - Jian-Xin Shen
- Department of Physiology, Shantou University of Medical College, Shantou, People’s Republic of China
| | - Michael R. Sierks
- Department of Chemical Engineering, Arizona State University, Tempe, Arizona, United States of America
| | - Jie Wu
- Divisions of Neurology, Barrow Neurological Institute, St. Joseph’s Hospital and Medical Center, Phoenix, Arizona, United States of America
- Department of Physiology, Shantou University of Medical College, Shantou, People’s Republic of China
- Department of Basic Medical Sciences, University of Arizona College of Medicine Phoenix, Arizona, United States of America
- * E-mail:
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Gao WW, Shen JX, Wang YL, Liang C, Zuo J. [Algorithm of locally adaptive region growing based on multi-template matching applied to automated detection of hemorrhages]. Guang Pu Xue Yu Guang Pu Fen Xi 2013; 33:448-453. [PMID: 23697130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In order to automatically detect hemorrhages in fundus images, and develop an automated diabetic retinopathy screening system, a novel algorithm named locally adaptive region growing based on multi-template matching was established and studied. Firstly, spectral signature of major anatomical structures in fundus was studied, so that the right channel among RGB channels could be selected for different segmentation objects. Secondly, the fundus image was preprocessed by means of HSV brightness correction and contrast limited adaptive histogram equalization (CLAHE). Then, seeds of region growing were founded out by removing optic disc and vessel from the resulting image of normalized cross-correlation (NCC) template matching on the previous preprocessed image with several templates. Finally, locally adaptive region growing segmentation was used to find out the exact contours of hemorrhages, and the automated detection of the lesions was accomplished. The approach was tested on 90 different resolution fundus images with variable color, brightness and quality. Results suggest that the approach could fast and effectively detect hemorrhages in fundus images, and it is stable and robust. As a result, the approach can meet the clinical demands.
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Affiliation(s)
- Wei-Wei Gao
- College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
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Niu SS, Shen JX, Liang C, Zhang YH, Li BM. [Comparative study on the performance of deformable mirror of NIR based human eye aberration correction system]. Guang Pu Xue Yu Guang Pu Fen Xi 2012; 32:1795-1800. [PMID: 23016327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The structure features and spatial characteristics of the two kinds of micro-machined membrane deformable mirrors, OKO 37-element and BMC 140-element, which work in the NIR based human eye aberration correction system, are compared and analyzed. At same time, the principal component analysis was carried out for the influence function of the mirror, the voltage control model was established and the optimal control mode of deformable mirror can be determined by adjusting the control parameter d. Finally, the simulation experiments for fitting aberration of unit Zernike mode and human eye aberration of Thibos model were carried out. The experiment results show that the capability for fitting the each Zernike mode of BMC 140-element mirror is twice more than the OKO 37-element mirror at least. When correcting the Thibos model human eye aberration whose average RMS error is 0.638 lambda (lambda=0.785 microm), the residual RMS error of BMC mirror is 0.063 lambda which achieves the diffraction limit (lambda/14) of the optical system, but the correction capability of OKO mirror is far less than BMC mirror due to the large cross-linked value between actuators, small density distribution of actuators and some other influencing factors, and the residual wave-front RMS error is 0.168 lambda. The methodology can also be used for other types of deformable mirror performance evaluation.
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Affiliation(s)
- Sai-Sai Niu
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
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Xiao JF, Wang CY, Huang YP, Shen JX, Gao FF, Huang ZQ, Zheng YS, Shi GG. N-n-butyl haloperidol iodide preserves cardiomyocyte calcium homeostasis during hypoxia/ischemia. Cell Physiol Biochem 2011; 27:433-42. [PMID: 21691060 DOI: 10.1159/000329964] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/03/2011] [Indexed: 02/05/2023] Open
Abstract
AIMS N-n-Butyl haloperidol iodide (F(2)) is a novel compound derived from haloperidol. In our previous work, F(2) was found to be an L-type calcium channel blocker which played a protective role in rat heart ischemic-reperfusion injury in a dose-dependent manner. In the current study, we aimed to investigate the effects and some possible mechanisms of F(2) on calcium transients in hypoxic/ischemic rat cardiac myocytes. METHODS AND RESULTS Calcium transients' images of rat cardiac myocytes were recorded during simulated hypoxia, using a confocal calcium imaging system. The amplitude, rising time from 25% to 75% (RT25-75), decay time from 75% to 25% (DT75-25) of calcium transients, and resting [Ca(2+)](i) were extracted from the images by self-coding programs. In this study, hypoxia produced a substantial increase in diastolic [Ca(2+)](i) and reduced the amplitude of calcium transients. Both RT25-75 and DT75-25 of Ca(2+) transients were significantly prolonged. And F(2) could reduce the increase in resting [Ca(2+)](i)and the prolongation of RT25-75 and DT75-25 of Ca(2+) transients during hypoxia. F(2) also inhibited the reduction in amplitude of calcium transients which was caused by 30-min hypoxia. The activity of SERCA2a (sarcoplasmic reticulum Ca(2+)-ATPase, determined by test kits) decreased after 30-min ischemia, and intravenous F(2) in rats could ameliorate the decreased activity of SERCA2a. The inward and outward currents of NCX (recorded by whole-cell patch-clamp analysis) were reduced during 10-min hypoxia, and F(2) further inhibited the outward currents of NCX during 10-min hypoxia. All these data of SERCA2a and NCX might be responsible for the changes in calcium transients during hypoxia. CONCLUSION Our data suggest that F(2) reduced changes in calcium transients that caused by hypoxia/ischemia, which was regarded to be a protective role in calcium homeostasis of ventricular myocytes, probably via changing the function of SERCA2a.
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Affiliation(s)
- Jian-Feng Xiao
- Department of Pharmacology, Shantou University Medical College, 22 Xinling Road, Shantou, PR China
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Shen JX, Zhang SM, Wen XJ. [The heart functions of preschool and school-age children by means of electrical impedance tomography]. Zhongguo Ying Yong Sheng Li Xue Za Zhi 2008; 24:17-124. [PMID: 21141546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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Cheung KMC, Lu WW, Luk KDK, Wong CT, Chan D, Shen JX, Qiu GX, Zheng ZM, Li CH, Liu SL, Chan WK, Leong JCY. Vertebroplasty by use of a strontium-containing bioactive bone cement. Spine (Phila Pa 1976) 2005; 30:S84-91. [PMID: 16138071 DOI: 10.1097/01.brs.0000175183.57733.e5] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN A review of the laboratory and clinical data for a new strontium-containing hydroxyapatite bioactive bone cement. OBJECTIVES To compare the properties of the strontium-containing bioactive bone cement with those of polymethyl methacrylate (PMMA) and hydroxyapatite (HA) bone cements. SUMMARY OF BACKGROUND DATA Vertebroplasty and kyphoplasty using conventional PMMA bone cements have been effectively used to treat osteoporotic spine fractures with good short- and medium-term results. However, PMMA has some undesirable properties, including its high setting temperature, lack of osseointegration, and large stiffness mismatch with osteoporotic bone. These properties are responsible for some postoperative complications. METHODS Strontium-containing hydroxyapatite (Sr-HA) bioactive bone cement consists of a filler blend of strontium-containing hydroxyapatite, fumed silica and benzoyl peroxide; and a resin blend of bisphenol A diglycidylether methacrylate, triethylene glycol dimethacrylate, poly(ethylene glycol) methacrylate, and N, N-dimethyl-p-toluidine. Its properties, including mechanical strength, setting temperature, biocompatibility, and osseoinduction, were compared with other cements in vitro and in vivo. Early clinical results are presented. RESULTS The Sr-HA cement has a setting time of 15 to 18 minutes, a maximum setting temperature of 58 degrees C, a compressive strength of 40.9 MPa, bending strength of 31.3 MPa, and a bending modulus of 1,408 MPa. The bending strength and modulus are closer to human cancellous bone. Sr-HA cement promotes osteoblast attachment and mineralization in vitro and bone growth and osseointegration in vivo. In a pilot study, 23 cases of osteoporotic fractures treated with this cement with a mean follow-up of 18 months suggest that it is as effective as PMMA in relieving pain. DISCUSSIONS Oral strontium has been shown to induce new bone formation and is effective in reducing fracture risk in osteoporosis. Our data suggest that strontium delivered locally has the same effect; thus, the combination of strontium with HA in a cement with a low setting temperature, adequate stiffness, and low viscosity makes this a good bioactive cement for vertebroplasty and kyphoplasty.
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Affiliation(s)
- Kenneth M C Cheung
- Department of Orthopaedics and Traumatology, University of Hong Kong, Hong Kong, China.
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Shen JX, Han TZ, Cheng HP. [Microscopic mechanism of excitation-contraction coupling in cardiac myocytes]. Sheng Li Ke Xue Jin Zhan 2004; 35:294-8. [PMID: 15727204 DOI: pmid/15727204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Cardiac excitation-contraction coupling (ECC) is, in essence, a communication process between sarcolemmal voltage-dependent L-type calcium channels (LCCs) and ryanodine receptors (RyRs) of sarcoplasmic reticulum (SR) by the mechanism of calcium-induced calcium release (CICR). Recent advances displayed more information about the microscopic signaling between LCCs and RyRs. In calcium release couplons, the calcium influx through the opening of LCCs by membrane depolarization forms calcium sparklets locally which then act on the adjacent SR RyRs. Stochastic activation of RyRs discharges calcium sparks from different calcium couplons, which summate into global calcium transients. Therefore, ignition of calcium sparks by calcium sparklets constitutes the elementary events in ECC. This review focuses on the intermolecular signaling between LCCs and RyRs, to describe the microscopic view of CICR and ECC.
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Affiliation(s)
- Jian-Xin Shen
- Department of Physiology, Shantou University Medical College, Shantou
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Abstract
Ca2+ sparks are the elementary release events in many types of cells. Here we present a morphometric analysis of Ca2+ sparks (i.e., amplitude and kinetic parameters) using an approach that minimizes the confounding factor of the detection of out-of-focus events. By activation and visualization of Ca2+ sparks from Ca2+ release units under loose-seal patch-clamp conditions, we found that the amplitude and rising rate of in-focus sparks exhibited a broad modal distribution, whereas spark rise time and spatial width appeared to be stereotyped. Spark morphometrics were constant irrespective of the latency of spark production and the time-dependent L-type Ca2+ channel activation. Polymorphism of Ca2+ sparks in terms of variable amplitude and rising rate was evident for events from the same release units, and intra- and interrelease unit variability contributed equally to the overall variability. The rising rate, a reporter of the underlying Ca2+ release flux, displayed a strong positive correlation with spark amplitude, but a negative correlation with spark rise time, an index of Ca2+ release duration. On the basis of Ca2+ spark morphometrics measured here, we suggested a model in which cohorts of variable number of ryanodine receptors are activated in the genesis of Ca2+ sparks, and the ensuing negative feedback overrides the regenerative Ca2+-induced Ca2+ release to extinguish the ongoing Ca2+ spark.
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Affiliation(s)
- Jian-Xin Shen
- Department of Physiology, Medical School of Xi'an Jiaotong University, Xi'an 710061, China
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Lu WW, Luk KDK, Cheung KCM, Gui-Xing Q, Shen JX, Yuen L, Ouyang J, Leong JCY. Microfracture and changes in energy absorption to fracture of young vertebral cancellous bone following physiological fatigue loading. Spine (Phila Pa 1976) 2004; 29:1196-201; discussion 1202. [PMID: 15167657 DOI: 10.1097/00007632-200406010-00007] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Fifty-five human thoracolumbar vertebrae were randomly fatigue loaded and analyzed. OBJECTIVES The purpose of this study was to explore the relationship between fatigue loading, trabecular microfracture, and energy absorption to fracture in human cadaveric thoracolumbar vertebrae. BACKGROUND Although trabecular microfractures are found in vivo and have been produced by fatigue loading in vitro, the effect of the level of physiologic fatigue loading on microfracture and energy absorption has not been investigated. METHODS Fifty-five human thoracolumbar vertebrae (T11-L4) were randomly divided into 5 groups: 1) control (no loading, n = 6); 2) axial compression to yield (n = 7); and 3-5) 20,000 cycles of fatigue loading at 2 Hz (each n = 14). The level of fatigue loading was determined as a proportion of the yield load of Group 2 as follows: 10% (Group 3), 20% (Group 4), and 30% (Group 5). Half of the specimens in groups 3 to 5 were used for radiographic and histomorphometric analysis to determine microfracture density and distribution, whereas the other half were tested to determine the energy absorption to yield failure. RESULTS No radiographic evidence of gross fracture was found in any of the groups following fatigue loading. A mean 7.5% increase in stiffness was found in specimens subject to cyclic loading at 10% of yield stress (Group 3). Fatigue at 20% (Group 4) and 30% of yield stress (Group 5) caused significantly higher (P < 0.05) increases in mean stiffness of 23.6% and 24.2%, respectively. Microfracture density increased from 0.46/mm in Group 3 to 0.66/mm in Group 4 and 0.94/mm in Group 5 (P < 0.05). The energy absorbed to failure decreased from 21.9 J in Group 3 to 18.1 J and 19.6 J in Groups 4 and 5, respectively (P < 0.05). CONCLUSIONS Fatigue loading at physiologic levels produced microfractures that are not detectable by radiography. Increased fatigue load results in an increase in microfracture density and decrease energy absorbed to fracture, indicating a reduced resistance to further fatigue loading.
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Affiliation(s)
- W W Lu
- Department of Orthopaedic Surgery, The University of Hong Kong, Hong Kong, PR China.
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Zhao H, Qiu GX, Zhao Y, Shen JX, Wang YP, Lin J. [Application of diapason instrumentation for treatment of unstable lumbosacral spinal stenosis]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2001; 23:651-3. [PMID: 12901117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
OBJECTIVE To observe the preliminary clinical outcome of using a new instrumentation Diapason system and to introduce the characterization and surgical technique of this new system for treatment of unstable lumbar spinal stenosis. METHODS 16 patients with unstable spinal stenosis who were treated by decompression, posterolateral intertransverse arthrodesis and transpedicle instrumentation of Diapason system, were analyzed retrospectively. RESULTS Lower back pain (LBP) of 16 patients were significantly alleviated after surgery (scores of LBP before operation: 47.5 +/- 0.8; scores of LBP after operation: 31.9 +/- 2.3, P < 0.001). There was no implant failure, no early or later infection and no neurological complications in 16 patients at an average of 6.2-month follow-ups. No pseudoarthrosis was observed on roentgenography. CONCLUSION Our short-term follow-up and limited cases study showed satisfactory preliminary result of treating unstable lumbar spinal stenosis with Diapason internal fixation.
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Affiliation(s)
- H Zhao
- Department of Orthopedic Surgery, PUMC Hospital, CAMS, PUMC, Beijing 100730, China.
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Abstract
OBJECTIVE Cochlear microphonic responses (CMs) were measured in a rabbit model in the intact ear (CM1) and in ears with a partially implantable piezoelectric middle ear implant (P-MEI) (CM2) to investigate the characteristics of speech transmission of the P-MEI in vivo. DESIGN The spectra of pure tones, voices, and elicited CM1 and CM2 obtained from the round window before and after the implantation of a P-MEI device were calculated by using fast Fourier transform. Frequency response functions of CM1 and CM2 were used to demonstrate the functional similarity between the implanted P-MEI and the normal ossicular chain. The coherence functions between the voices and CM1 and between CM1 and CM2 were evaluated to characterize speech transmission of the P-MEI in vivo. Ten rabbit ears were used in this study. Pure tones, six Chinese vowels, and six Chinese characters were the acoustic stimuli. The CMs elicited by a list of bisyllabic words were tape-recorded and then recognized by subjects with normal hearing. RESULTS Using pure tones at the same intensity of 90 dB SPL, frequency response functions of the CMs between the two states (the intact ear with normal hearing and ears with a P-MEI device at the medium volume) were calculated showing great resemblance in shape. Compared with that at 1 kHz, gain factors were 10 and 20 dB, respectively, at higher frequencies. The correlation and spectral analyses of the vocalizations, CM1 and CM2, demonstrated that the harmonics of CM1 were approximately identical as those of the voices between 0.5 and 5.0 kHz with coherence functions of about 0.7 to approximately 1 at the formants' frequencies, whereas the harmonics of CM2 between 0.5 and 2.5 kHz were enhanced with the coherences near to unity at the formants' frequencies, and others <0.5 kHz and >2.5 kHz were attenuated. The recognition score of the CMs elicited by a list of bisyllabic words was >90% using subjects with normal hearing. CONCLUSIONS Data from this study suggest that cochlear microphonic potentials can be used as an important tool to evaluate objectively whether the implantation of a P-MEI device is successful and whether the quality in speech transmission of the P-MEI is satisfactory. Thus, the method would be of significance to clinically ascertain the performance of the device in vivo.
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Affiliation(s)
- J X Shen
- Laboratory for Visual Information Processing, Institute of Biophysics, Chinese Academy of Sciences, Beijing, Chaoyang District
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Abstract
In this study we examined the neuronal responses of single units to different sound durations in the inferior colliculus (IC) of the mouse. One hundred and one recorded units were classified into onset (58%), sustained (9%) on-sustained (22%), pauser (9%) and chopper (2%) response patterns. Thirty-four percent of the recorded units showing stronger responses to long stimulus durations were defined as long-duration-selective neurons. Twenty-five percent of the units preferred a narrow range of sound durations and were classified as band-pass neurons. Ten percent of the units responded preferentially to short stimulus durations and thus displayed short-duration selectivity. Twelve percent of the units that responded with nearly constant spike counts to stimuli of varying duration were classified as all-pass neurons. In contrast to the result of no short-duration-selective neurons found in chinchilla IC, we observed that some of the onset units in the IC of the mouse displayed a short duration preference. The best duration range of the duration-selective neurons in the present study corresponds to the duration range of mouse calls. We suggest that an inhibitory mechanism contributes to the duration selectivity observed in the present study.
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Affiliation(s)
- Y F Xia
- Laboratory of Visual Information Processing, Institute of Biophysics, Chinese Academy of Sciences, Beijing, People's Republic of China
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Abstract
Single cortical auditory neurons sequentially isolated within orthogonal electrode penetrations in the mouse were studied using tonal stimulation. They had common functional properties, such as firing pattern, best frequency, minimum threshold, sharpness of frequency tuning and onset latency. The finding suggests that there is columnar organization in the cortex.
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Affiliation(s)
- J X Shen
- Laboratory of Visual Information Processing, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing, China.
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Chen YC, Han TZ, Shen JX, Qiao JT. [A quantitative study on the synaptic ultrastructural alterations in visual cortex in the maintenance of LTP]. Sheng Li Xue Bao 1999; 51:73-9. [PMID: 11972179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
The ultrastructure of synapses three hours after formation of long-term potentiation (LTP) was examined in the local microslices of visual cortical brain slices of 18-20 d rats. Slices without potentiating stimulation which were similarly incubated served as controls. The following structural changes were examined using a graph analyzer: (1) synaptic cleft width; (2) thickness of the postsynaptic densities(PSD); (3) length of the active zones; and (4) curvature of the synaptic interface. The number of synapses of different types in layer II/III of visual cortex was quantified by double-blind scoring procedures. The various counts were converted to the number of synapses per unit volume using stereological quantitation method. Analysis of variance was used for statistical evaluation. Our results suggest that field potentials reached their peak values at about one and a half hours after tetanus and could be maintained as long as three hours without decay. In comparison with the control groups, synaptic cleft width, thickness of PSD, surface density per unit volume(Sv) of the active zones, curvature of the synaptic interface, numeric density per unit volume (Nv) of all synapses, spine synapses and the Nv of perforated synapses were all increased significantly. These data suggest that the increase of Sv of active zones and the increase of the curvature of synaptic interface may be the morphological feature characterizing the maintenance of LTP, in addition to the formation of perforated synapses.
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Affiliation(s)
- Y C Chen
- Department of Physiology, Medical College, Shantou University, Shantou, 515031
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Jen PH, Sun X, Shen JX, Chen QC, Qian Y. Cytoarchitecture and sound activated responses in the auditory cortex of the big brown bat, Eptesicus fuscus. Acta Otolaryngol Suppl 1998; 532:61-7. [PMID: 9442846 DOI: 10.3109/00016489709126146] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Under free field and closed-system stimulation conditions, we studied the frequency threshold curves, auditory spatial sensitivity and binaurality of neurons in the primary auditory cortex (AC) of the big brown bat, Eptesicus fuscus. All 298 recorded AC neurons discharged phasically. They were recorded at depths less than 1,000 microns with response latencies of 7-25 ms, best frequencies (BFs) of 28-97 kHz and minimum thresholds (MTs) of 8-90 dB SPL. They received excitatory inputs from the contralateral ear and either excitatory (EE) or inhibitory (EI) inputs from the ipsilateral ear. These cortical neurons were tonotopically organized along the anteroposterior axis of the AC. High best frequency neurons were located anteriorly and low best frequency neurons posteriorly. They were most sensitive to sounds delivered from a restricted region of the contralateral frontal auditory space (0 degree-50 degrees in azimuth and 2 degrees up, 15 degrees down in elevation). Frontal auditory space representation appears to be systematically arranged according to the tonotopic axis such that the lateral space is represented posteriorly and the middle space anteriorly. Cortical neurons sequentially isolated from an orthogonally penetrated electrode had similar frequency threshold curves, BFs, MTs, points of maximal auditory spatial sensitivity and binaurality. The EE and EI columns are organized concentrically such that the small number of centrally located EE columns were surrounded by an overwhelming number of EI columns. Using Nissl and Golgi stains as well as c-fos immunocytochemistry, we studied the cytoarchitecture, cell types and sound elicited Fos-like immunoreactivity in the primary AC of this bat species. The primary AC of this bat species can be described into molecular (137 microns), external granular (55 microns), external pyramidal (95 microns), internal granular (102 microns), internal pyramidal (191 microns) and multiform (120 microns) layers. The main type of cells distributed among these six layers are the small, medium and large pyramidal cells. Others include the stellate, horizontal, granular, fusiform, basket, and Martinotii cells. When stimulated with 30 kHz and 79 dB SPL sounds under natural conditions, bilaterally and symmetrically distributed Fos-like immunoreactive neurons were observed in about 20% of neurons in each AC. When stimulated under monaurally plugged conditions, 39-48% more of Fos-like immunoreactive neurons were observed in the ipsilateral AC. This finding supports the fact that the primary AC receives auditory inputs mainly from the contralateral ear.
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Affiliation(s)
- P H Jen
- Division of Biological Sciences, University of Missouri-Columbia 65211, USA.
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Shen JX, Chen QC, Jen PH. Binaural and frequency representation in the primary auditory cortex of the big brown bat, Eptesicus fuscus. J Comp Physiol A Neuroethol Sens Neural Behav Physiol 1997; 181:591-7. [PMID: 9449819 DOI: 10.1007/s003590050142] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This study examines the binaural and frequency representation in the primary auditory cortex (AC) of the big brown bat, Eptesicus fuscus, by using an ear-phone stimulation system. All 306 cortical neurons studied were excited by contralateral sound stimulation but they were either excited, inhibited or not affected by ipsilateral sound stimulation. These cortical neurons were columnarly organized according to their binaural and frequency-tuning properties. The excitation-excitation columns which occupy about 15% of the AC are mainly aggregated within an oval-shaped area of the central AC. The excitation-inhibition neurons and binaural neurons with mixed properties are distributed in the remaining 85% of the surrounding primary AC. Although the best frequency (BF) of these neurons shows a tendency to decrease from high to low along the anteroposterior axis of the primary AC, systematic variation in BF is not always consistent across the entire mapping area. In particular, BFs of cortical neurons isolated in the anterior AC vary quite unsystematically such that neurons with similar BFs are aggregated in isolated patches. Isofrequency and binaural columns are segregated into bands that intersect each other.
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Affiliation(s)
- J X Shen
- Division of Biological Sciences, University of Missouri-Columbia 65211, USA
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Colorado A, Shen JX, Vartanian VH, Brodbelt J. Use of infrared multiphoton photodissociation with SWIFT for electrospray ionization and laser desorption applications in a quadrupole ion trap mass spectrometer. Anal Chem 1996; 68:4033-43. [PMID: 8916455 DOI: 10.1021/ac9600565] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Infrared multiphoton photodissociation (IRMPD) is combined with stored wave form inverse Fourier transforms (SWIFT) to effect dissociation and ion ejection in a quadrupole ion trap mass spectrometer. The application of IRMPD to the structural characterization of biochemical ions generated by chemical ionization and electrospray ionization and the feasibility of utilizing infrared photons for the activation of laser-desorbed metal ion-crown ether complexes was examined. The effect of helium pressure on the dissociation efficiency and relative dissociation rate constants for systems with well-known thermochemistry was evaluated. The helium pressure is not detrimental to the IRMPD experiment when nominal pressures lower than 2 x 10(-5) Torr are used. At pressures close to nominally 8 x 10(-5) Torr of helium, collisonal deactivation dominates. Results show conventional CAD is a more selective dissociation technique; however, the amount of fragment ion information generated depends highly on the qz value. IRMPD, on the other hand, is independent of the value of qz such that low rf storage values can be utilized during the irradiation period. Thus, under these conditions, informative lower mass fragment ions are trapped and detected. A larger number of structurally informative fragments is generated upon irradiation with infrared photons relative to the CAD method because of the further excitation of primary fragment ions upon photoabsorption. SWIFT wave forms are successfully utilized to determine the extent of excitation of primary fragment ions as well as prove/disprove dissociation pathways of a variety of ions such as macrolide antibiotics and hydrogen-bonded complexes.
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Affiliation(s)
- A Colorado
- Department of Chemistry and Biochemistry, University of Texas, Austin 78712, USA
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Shen JX, Zhao H. [Significance of patellar resurfacing in total knee arthroplasty]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1994; 16:242-4. [PMID: 7805173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Kirby RD, Shen JX, Hardy RJ, Sellmyer DJ. Magnetization reversal in nanoscale magnetic films with perpendicular anisotropy. Phys Rev B Condens Matter 1994; 49:10810-10813. [PMID: 10009923 DOI: 10.1103/physrevb.49.10810] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Shan ZS, Sellmyer DJ, Jaswal SS, Wang YJ, Shen JX. Magnetism of rare-earth-transition-metal nanoscale multilayers. II. Theoretical analysis of magnetization and perpendicular magnetic anisotropy. Phys Rev B Condens Matter 1990; 42:10446-10459. [PMID: 9995306 DOI: 10.1103/physrevb.42.10446] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Shan ZS, Sellmyer DJ, Jaswal SS, Wang YJ, Shen JX. Magnetism of rare-earth-transition-metal nanoscale multilayers. Phys Rev Lett 1989; 63:449-452. [PMID: 10041076 DOI: 10.1103/physrevlett.63.449] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Parker WB, Bapat AR, Shen JX, Townsend AJ, Cheng YC. Interaction of 2-halogenated dATP analogs (F, Cl, and Br) with human DNA polymerases, DNA primase, and ribonucleotide reductase. Mol Pharmacol 1988; 34:485-91. [PMID: 3050447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Recently, 2-halogenated deoxyadenosine analogs (F, Cl, and Br) have been shown to have antitumor activity. These analogs are phosphorylated by cells and are believed to exert their cytotoxic action at the nucleoside triphosphate level. In this work the interaction of these nucleoside triphosphate analogs with potential targets, such as DNA polymerase alpha, beta, and gamma, DNA primase, and ribonucleotide reductase was examined in detail. All of these compounds competitively inhibited the incorporation of dAMP into DNA by DNA polymerase alpha, beta, or gamma. F-dATP was able to completely substitute for dATP using DNA polymerase alpha and gamma, but not with DNA polymerase beta. Cl-dATP and Br-dATP substituted poorly for dATP using DNA polymerase alpha and beta. Extension of a 32P-labeled primer by DNA polymerase alpha, beta, or gamma on a single-stranded M13 template showed that these compounds were incorporated into the 3' end of the growing DNA chain and that elongation beyond the incorporated analogs was significantly retarded for Cl-dATP and Br-dATP using either DNA polymerase alpha or beta. DNA primase using poly(dC) as template was inhibited by these compounds at a concentration 4 to 5 times greater than that required for 2-F-araATP. The 2-halogenated dATP analogs were potent inhibitors of ADP reduction by ribonucleotide reductase. In conclusion, the cytotoxic action of 2-Cl-deoxyadenosine and 2-Br-deoxyadenosine may partially be mediated through the mechanism of "self-potentiation," by depression of the deoxynucleoside triphosphate pools due to inhibition of ribonucleotide reductase, which would facilitate their incorporation into DNA and result in the inhibition of DNA synthesis.
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Affiliation(s)
- W B Parker
- Department of Pharmacology, University of North Carolina, School of Medicine, Chapel Hill 27599
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Shen JX, Zhang PZ, Qiao M. [A novel synthesis of Tanshinone IIA--an active component of Salvia miltiorrhiza bunge]. Yao Xue Xue Bao 1988; 23:545-8. [PMID: 3218527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Shen JX. [Diagnostic significance of antinuclear antibody in lupus erythematosus (with cases report) (author's transl)]. Zhonghua Kou Qiang Ke Za Zhi 1979; 14:101-3. [PMID: 318021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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