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Gao P, Guo SL, Li YS. [2015 annual review of interventional pulmonology]. Zhonghua Jie He He Hu Xi Za Zhi 2016; 39:391-392. [PMID: 27180596 DOI: 10.3760/cma.j.issn.1001-0939.2016.05.013] [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: 06/05/2023]
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Li X, Liu CY, Li YS, Xu J, Li DG, Li X, Han D. Deep RNA sequencing elucidates microRNA-regulated molecular pathways in ischemic cardiomyopathy and nonischemic cardiomyopathy. Genet Mol Res 2016; 15:gmr7465. [PMID: 27173194 DOI: 10.4238/gmr.15027465] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Deregulation of cardiac miRNA gene-regulatory networks is a feature of different heart diseases, including ischemic (ICM) and nonischemic (NICM) cardiomyopathy. Here, based on the paired miRNA and mRNA expression profiles in ICM and NICM, we identified the differentially expressed miRNAs and mRNAs and the expression signatures distinguishing ICM/NICM from control samples. Furthermore, we constructed a functional miRNA network for each disease. Analysis of the topological features of these networks revealed that the Wnt signaling pathway and cell cycle (de)regulation play critical roles in the development of ICM and NICM. In addition, comparison of the miRNA and mRNA functional profiles revealed that their expression patterns in ICM and NICM differ. These findings revealed hundreds of novel heart-failure-related miRNAs with important regulatory functions. In summary, RNA-seq-based transcriptome profiling in the failing human heart revealed a complex transcriptional regulation associated with the disease. The newly uncovered importance of miRNAs in disease pathogenesis highlights their value as potential diagnostic and therapeutic targets.
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Affiliation(s)
- X Li
- National Center for Nanoscience and Technology, Beijing, China
| | - C Y Liu
- National Center for Nanoscience and Technology, Beijing, China
| | - Y S Li
- College of Bioinformatics Science and Technology, Harbin Medical University, Harbin, China
| | - J Xu
- College of Bioinformatics Science and Technology, Harbin Medical University, Harbin, China
| | - D G Li
- Institute of Biomedical Engineering, Capital Medical University, Beijing, China
| | - X Li
- College of Bioinformatics Science and Technology, Harbin Medical University, Harbin, China
| | - D Han
- National Center for Nanoscience and Technology, Beijing, China
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Ding ZT, Shen JZ, Pan LL, Wang YU, Li YS, Wang Y, Sun HW. CsSAD: a fatty acid desaturase gene involved in abiotic resistance in Camellia sinensis (L.). Genet Mol Res 2016; 15:15017512. [PMID: 26985937 DOI: 10.4238/gmr.15017512] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Tea (Camellia sinensis L.) is a thermophilic evergreen woody plant that has poor cold tolerance. The SAD gene plays a key role in regulating fatty acid synthesis and membrane lipid fluidity in response to temperature change. In this study, full-length SAD cDNA was cloned from tea leaves using rapid amplification of cDNA ends and polymerase chain reaction (PCR)-based methods. Sequence analysis demonstrated that CsSAD had a high similarity to other corresponding cDNAs. At 25°C, the CsSAD transcriptional level was highest in the leaf and lowest in the stem, but there was no obvious difference between the root and stem organs. CsSAD expression was investigated by reverse transcription-PCR, which showed that CsSAD was upregulated at 4° and -5°C. At 25°C, CsSAD was induced by polyethylene glycol, abscisic acid, and wounding, and a similar trend was observed at 4°C, but the mean expression level at 4°C was lower than that at 25°C. Under natural cold acclimation, the 'CsCr05' variety's CsSAD expression level increased before decreasing. The CsSAD expression level in variety 'CsCr06' showed no obvious change at first, but rapidly increased to a maximum when the temperature was very low. Our study demonstrates that CsSAD is upregulated in response to different abiotic conditions, and that it is important to study the stress resistance of the tea plant, particularly in response to low temperature, drought, and wounding.
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Affiliation(s)
- Z T Ding
- Tea Research Institute, Qingdao Agricultural University, Qingdao, Shandong, China.,Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticultural Plant, Qingdao, Shandong, China
| | - J Z Shen
- Tea Research Institute, Qingdao Agricultural University, Qingdao, Shandong, China.,Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticultural Plant, Qingdao, Shandong, China
| | - L L Pan
- Tea Research Institute, Qingdao Agricultural University, Qingdao, Shandong, China.,Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticultural Plant, Qingdao, Shandong, China
| | - Y U Wang
- Tea Research Institute, Qingdao Agricultural University, Qingdao, Shandong, China.,Qingdao Key Laboratory of Genetic Improvement and Breeding in Horticultural Plant, Qingdao, Shandong, China
| | - Y S Li
- Fruit and Tea Technology Extension Station, Jinan, Shandong, China
| | - Y Wang
- Qingdao Fruit, Tea and Flower Workstation, Shandong, China
| | - H W Sun
- Taishan Academy of Forestry Science, Taian, Shandong, China
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Meng XY, Li YS, Zhou Y, Sun Y, Qiao B, Si CC, Hu P, Lu SY, Ren HL, Liu ZS, Qiu HJ, Liu JQ. An improved RT-IPCR for detection of pyrene and related polycyclic aromatic hydrocarbons. Biosens Bioelectron 2015; 78:194-199. [PMID: 26609944 DOI: 10.1016/j.bios.2015.11.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [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: 10/09/2015] [Revised: 11/09/2015] [Accepted: 11/13/2015] [Indexed: 11/17/2022]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous homogeneous chemicals which are well known by carcinogens, mutagens and endocrine disorder. Here, an improved real-time immuno-PCR (RT-IPCR) was developed for detection of pyrene and its homologs in water samples. The PAHs in sample compete with pyrene-modified DNA to bind with monoclonal antibody (McAb) coated on PCR plate. The reporter DNA was exponentially amplified by real-time PCR instrument using Fast Start universal SYBR Green Master (ROX) kit. Only two reaction steps were needed to accomplish the detection. The assay had a good linear range from 5 pmol L(-1) to 5 nmol L(-1) with a detection limit of 3.5 pmol L(-1). For application assay, the average recoveries from tap water, lake water and mineral water were 98.4%, 98.2% and 99.7%, respectively which showed a good correlation (R(2)=0.9906) with those from GC-MS. The results indicated that the improved RT-IPCR seems to be a potential method for simple and ultrasensitive detection of pyrene and some homologues in environment water samples.
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Affiliation(s)
- X Y Meng
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China; State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China
| | - Y S Li
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China
| | - Y Zhou
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou, People's Republic of China.
| | - Y Sun
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China; Biological Engineering Department, Jilin Business and Technology College, Changchun 130507, PR China
| | - B Qiao
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China
| | - C C Si
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China
| | - P Hu
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China
| | - S Y Lu
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China
| | - H L Ren
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China
| | - Z S Liu
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses/College of Veterinary Medicine, The First Hospital of Jilin University, Jilin University, Changchun 130062, PR China
| | - H J Qiu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150001, China
| | - J Q Liu
- Production Quality Test Institute of Jilin Province, Changchun 130022, PR China
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Zhang Y, Chen C, Liang CY, Liu ZW, Li YS, Che R. Strain-tuned optoelectronic properties of hollow gallium sulphide microspheres. Nanoscale 2015; 7:17381-17386. [PMID: 26440072 DOI: 10.1039/c5nr05528h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Sulfide semiconductors have attracted considerable attention. The main challenge is to prepare materials with a designable morphology, a controllable band structure and optoelectronic properties. Herein, we report a facile chemical transportation reaction for the synthesis of Ga2S3 microspheres with novel hollow morphologies and partially filled volumes. Even without any extrinsic dopant, photoluminescence (PL) emission wavelength could be facilely tuned from 635 to 665 nm, depending on its intrinsic inhomogeneous strain distribution. Geometric phase analysis (GPA) based on high-resolution transmission electron microscopy (HRTEM) imaging reveals that the strain distribution and the associated PL properties can be accurately controlled by changing the growth temperature gradient, which depends on the distance between the boats used for raw material evaporation and microsphere deposition. The stacking-fault density, lattice distortion degree and strain distribution at the shell interfacial region of the Ga2S3 microspheres could be readily adjusted. Ab initio first-principles calculations confirm that the lowest conductive band (LCB) is dominated by S-3s and Ga-4p states, which shift to the low-energy band as a result of the introduction of tensile strain, well in accordance with the observed PL evolution. Therefore, based on our strain driving strategy, novel guidelines toward the reasonable design of sulfide semiconductors with tunable photoluminescence properties are proposed.
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Affiliation(s)
- Yin Zhang
- Laboratory of Advanced Materials, Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200438, People's Republic of China.
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Li YS, He X, Ma K, Wu YP, Li BX. The Effect of Exposure to Atrazine on Dopaminergic Development in Pubertal Male SD Rats. ACTA ACUST UNITED AC 2015; 104:184-9. [PMID: 26331294 DOI: 10.1002/bdrb.21151] [Citation(s) in RCA: 18] [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: 06/10/2015] [Accepted: 07/31/2015] [Indexed: 11/10/2022]
Abstract
Atrazine (ATR, 2-chloro-4-ethylamino-6-isopropylamino-s-triazine) is used worldwide as a herbicide, and its presence in the environment has resulted in documented human exposure. A lack of strong evidence for genetic heritability of idiopathic Parkinson's disease has focused attention on environmental toxicants in the disease etiology, particularly agrichemicals. Parkinson's disease is associated with advanced age and is characterized by the degeneration of dopaminergic neurons, but it is unclear whether specific neuronal damage could result from insults during development. The juvenile period is particularly vulnerable to environmental agent, therefore, we evaluated the effects of a 28-day exposure to ATR on the dopaminergic system in pubertal rats. Sprague-Dawley rats were treated orally with ATR at 50, 100, and 200 mg/kg bw, daily from postnatal days 27 to 54. In this study, we examined the hypothesis that pubertal exposure to ATR would disrupt the development of the nigrostriatal dopamine (DA) system. The content of DA and levodopa (L-DA) were examined in striatum samples by HPLC-FL, and the mRNA and protein expression of tyrosine hydroxylase, orphan nuclear hormone receptor (Nurr1), Nurr1 interacting protein (NuIP), and cyclin-dependent kinase inhibitors of the Cip̲Kip family (p57kip2) were examined in samples of the nigrostriatum by use of fluorescence Real-Time quantitative polymerase chain reaction (PCR). Exposure of juvenile rats to the high dose of ATR led to reduced levels of DA and L-DA, genes expression of NuIP, Nurr1, and p57kip2 in animals.
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Affiliation(s)
- Yan-Shu Li
- Department of Toxicology, College of Public Health, Harbin Medical University, Harbin, Heilongjiang Province, PR China
| | - Xi He
- Department of Toxicology, College of Public Health, Harbin Medical University, Harbin, Heilongjiang Province, PR China
| | - Kun Ma
- Department of Toxicology, College of Public Health, Harbin Medical University, Harbin, Heilongjiang Province, PR China
| | - Yan-Ping Wu
- Department of Toxicology, College of Public Health, Harbin Medical University, Harbin, Heilongjiang Province, PR China
| | - Bai-Xiang Li
- Department of Toxicology, College of Public Health, Harbin Medical University, Harbin, Heilongjiang Province, PR China
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Li YS, Meng XY, Zhou Y, Zhang YY, Meng XM, Yang L, Hu P, Lu SY, Ren HL, Liu ZS, Wang XR. Magnetic bead and gold nanoparticle probes based immunoassay for β-casein detection in bovine milk samples. Biosens Bioelectron 2014; 66:559-64. [PMID: 25522084 DOI: 10.1016/j.bios.2014.12.025] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [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: 09/19/2014] [Revised: 11/27/2014] [Accepted: 12/08/2014] [Indexed: 10/24/2022]
Abstract
In this work, a double-probe based immunoassay was developed for rapid and sensitive determination of β-casein in bovine milk samples. In the method, magnetic beads (MBs), employed as supports for the immobilization of anti-β-casein polyclonal antibody (PAb), were used as the capture probe. Colloidal gold nanoparticles (AuNPs), employed as a bridge for loading anti-β-casein monoclonal antibody (McAb) and horseradish peroxidase (HRP), were used as the amplification probe. The presence of β-casein causes the sandwich structures of MBs-PAb-β-casein-McAb-AuNPs through the interaction between β-casein and the anti-β-casein antibodies. The HRP, used as an enzymatic-amplified tracer, can catalytically oxidize the substrate 3,3',5,5'-tetramethylbenzidine (TMB), generating optical signals that are proportional to the quantity of β-casein. The linear range of the immunoassay was from 6.5 to 1520ngmL(-1). The limit of detection (LOD) was 4.8ngmL(-1) which was 700 times lower than that of MBs-antibody-HRP based immunoassay and 6-7 times lower than that from the microplate-antibody-HRP based assay. The recoveries of β-casein from bovine milk samples were from 95.0% to 104.3% that had a good correlation coefficient (R(2)=0.9956) with those obtained by an official standard Kjeldahl method. For higher sensitivity, simple sample pretreatment and shorter time requirement of the antigen-antibody reaction, the developed immunoassay demonstrated the viability for detection of β-casein in bovine milk samples.
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Affiliation(s)
- Y S Li
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - X Y Meng
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - Y Zhou
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China.
| | - Y Y Zhang
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - X M Meng
- Grain and Oil Food Processing Key Laboratory of Jilin Province, Jilin Business and Technology College, Changchun 130062, PR China
| | - L Yang
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - P Hu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - S Y Lu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - H L Ren
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - Z S Liu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - X R Wang
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis, College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
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Zhang W, Li YS, Du P, Xu C, Hui PM. Phase transitions in a coevolving snowdrift game with costly rewiring. Phys Rev E Stat Nonlin Soft Matter Phys 2014; 90:052819. [PMID: 25493846 DOI: 10.1103/physreve.90.052819] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2014] [Indexed: 06/04/2023]
Abstract
We propose and study a dissatisfied adaptive snowdrift game with a payoff parameter r that incorporates a cost for rewiring a connection. An agent, facing adverse local environment, may switch action without a cost or rewire an existing link with a cost a so as to attain a better competing environment. Detailed numerical simulations reveal nontrivial and nonmonotonic dependence of the frequency of cooperation and the densities of different types of links on a and r. A theory that treats the cooperative and noncooperative agents separately and accounts for spatial correlation up to neighboring agents is formulated. The theory gives results that are in good agreement with simulations. The frequency of cooperation f_{C} is enhanced (suppressed) at high rewiring cost relative to that at low rewiring cost when r is small (large). For a given value of r, there exists a critical value of the rewiring cost below which the system evolves into a phase of frozen dynamics with isolated noncooperative agents segregated from a cluster of cooperative agents, and above which the system evolves into a connected population of mixed actions with continual dynamics. The phase boundary on the a-r phase space that separates the two phases with distinct structural, population and dynamical properties is mapped out. The phase diagram reveals that, as a general feature, for small r (small a), the disconnected and segregated phase can survive over a wider range of a(r).
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Affiliation(s)
- W Zhang
- Department of Electronics and Communication Engineering, Suzhou Institute of Industrial Technology, Suzhou, 215104, China
| | - Y S Li
- College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, 215006, China
| | - P Du
- College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, 215006, China
| | - C Xu
- College of Physics, Optoelectronics and Energy, Soochow University, Suzhou, 215006, China
| | - P M Hui
- Department of Physics and Institute of Theoretical Physics, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
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Li YS, Zhu NH, Niu PP, Shi FX, Hughes CL, Tian GX, Huang RH. Effects of Dietary Chromium Methionine on Growth Performance, Carcass Composition, Meat Colour and Expression of the Colour-related Gene Myoglobin of Growing-finishing Pigs. Asian-Australas J Anim Sci 2014; 26:1021-9. [PMID: 25049881 PMCID: PMC4093490 DOI: 10.5713/ajas.2013.13012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/05/2013] [Revised: 03/27/2013] [Accepted: 03/06/2013] [Indexed: 11/27/2022]
Abstract
To investigate the effect of dietary chromium (Cr) as Cr methionine (CrMet) on growth performance, carcass traits, pork quality, meat colour and expression of meat colour-related genes in growing-finishing pigs, 189 crossbred Duroc×(Landrace×Yorkshire) growing-finishing pigs (male, castrated, average initial BW 74.58±1.52 kg) were selected and randomly allocated into four groups. Dietary treatments per kg of feed were as follows: 0 (CT), 0.3 mg/kg (T1), 0.6 mg/kg (T2) and 0.9 mg/kg (T3) Cr (in the form of CrMet; as-fed basis), and each treatment was replicated five times with 8 to 10 pigs per replicate pen. During the 28 d of the experiment, both the ADG and the ADFI increased linearly (p<0.05) as the level of dietary Cr increased. The F/G ratio decreased linearly (p<0.05). As dietary Cr increased, loin muscle areas (linear, p = 0.013) and average backfat thickness (linear, p = 0.072) decreased. Shear force (linear, p = 0.070) and Commission Internationale de I’Éclairage (CIE) redness (quadratic, p = 0.028) were increased. In addition, CIE Lightness (quadratic, p = 0.053) were decreased as dietary Cr increased. As dietary Cr increased, total myglobin (Mb) content (quadratic, p = 0.015) and the mb mRNA levels (quadratic, p = 0.046) in longissimus muscles of pigs were up-regulated. In conclusion, supplementation of dietary Cr improved growth and meat colour, but increased shear force and decreased IMF reduced palatability of longissimus muscles. Moreover, the increasing total Mb content and mb mRNA levels indicated that CrMet dietary supplementation may improve meat colour via up-regulating expression of the mb gene.
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Affiliation(s)
- Y S Li
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - N H Zhu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - P P Niu
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - F X Shi
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - C L Hughes
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - G X Tian
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
| | - R H Huang
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China
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Li YQ, Liu ZP, Yang K, Li YS, Zhao B, Fan ZF, Wan P. First Report of Bean common mosaic virus Infecting Azuki Bean (Vigna angularis) in China. Plant Dis 2014; 98:1017. [PMID: 30708882 DOI: 10.1094/pdis-01-14-0064-pdn] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Azuki bean (Vigna angularis Ohwi & Ohashi) is one of the traditional grain legumes in China. From 2010 to 2013, mosaic and crumpling symptoms on leaves and stunting, all typical symptoms of a viral disease, were observed on cultivars CWA030, CWA221, and JCA002 of azuki bean with incidence rates of 30 to 100% and yield losses of 50 to 95% in the three fields of Changping district, Beijing. To identify the possible viral pathogen(s), 21 symptomatic leaf samples from different cultivars were collected and total RNA was extracted from the samples and subjected to RT-PCR testing with degenerate primers targeting portions of the coding regions of Cucumovirus capsid protein (CP) (1) and Potyvirus NIb (2); these viruses had been reported in azuki bean. Fragments of 940 bp and 350 bp corresponding to Cucumovirus CP and Potyvirus NIb, respectively, were amplified from all the samples collected. Sequencing of the PCR products from nine samples, followed by BLAST analysis, confirmed the presence of Cucumber mosaic virus (CMV) and Bean common mosaic virus (BCMV). All the samples tested were also positive with direct antigen coating (DAC)-ELISA using specific antiserum to CMV or BCMV (Agdia, Elkhart, IN). The CMV CP gene (GenBank Accession No. KJ467817) shared 99% sequence identity with a China CMV isolate (DQ873558). To further characterize the BCMV strain found, fragments of 3,388 bp spanning BCMV NIa, NIb, CP and 3'UTR regions were amplified with another primer set, BCMV-F (5'-AGCAAGTCAATTTACAAGGGACTTC-3') and BCMV-R (5'-GGAACAACAAACATTGCCGTAGCTAC-3') from three samples, and three independent clones from each sample were sequenced. Sequence analysis revealed that this segment (KJ467816) shared 98% identity with the BCMV azuki bean strain (U60100). To the best of our knowledge, this is the first report of BCMV, together with CMV, naturally infecting azuki bean in China. Further attention should be paid to this emerging viral disease and measures should be taken to control the spread of BCMV. References: (1) S. K. Choi et al. J. Virol. Methods 83:1345, 1999. (2) L. Zheng et al. Plant Pathol. 59:1345, 2010.
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Affiliation(s)
- Y Q Li
- College of Plant Science and Technology, Beijing University of Agriculture, Huilongguan No. 7 Beinong Road, Beijing 102206, P. R. China
| | - Z P Liu
- College of Plant Science and Technology, Beijing University of Agriculture, Huilongguan No. 7 Beinong Road, Beijing 102206, P. R. China
| | - K Yang
- College of Plant Science and Technology, Beijing University of Agriculture, Huilongguan No. 7 Beinong Road, Beijing 102206, P. R. China
| | - Y S Li
- College of Plant Science and Technology, Beijing University of Agriculture, Huilongguan No. 7 Beinong Road, Beijing 102206, P. R. China
| | - B Zhao
- College of Plant Science and Technology, Beijing University of Agriculture, Huilongguan No. 7 Beinong Road, Beijing 102206, P. R. China
| | - Z F Fan
- State Key Laboratory of Agro-biotechnology and Department of Plant Pathology, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, P. R. China
| | - P Wan
- College of Plant Science and Technology, Beijing University of Agriculture, Huilongguan No. 7 Beinong Road, Beijing 102206, P. R. China
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Li YS, Zhou Y, Meng XY, Zhang YY, Liu JQ, Zhang Y, Wang NN, Hu P, Lu SY, Ren HL, Liu ZS. Enzyme-antibody dual labeled gold nanoparticles probe for ultrasensitive detection of κ-casein in bovine milk samples. Biosens Bioelectron 2014; 61:241-4. [PMID: 24892786 DOI: 10.1016/j.bios.2014.05.032] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [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: 04/01/2014] [Accepted: 05/13/2014] [Indexed: 11/28/2022]
Abstract
A dual labeled probe was synthesized by coating gold nanoparticles (AuNPs) with anti-κ-CN monoclonal antibody (McAb) and horseradish peroxidase (HRP) enzyme on their surface. The McAb was used as detector and HRP was used as label for signal amplification catalytically oxidize the substrate. AuNPs were used as bridges between the McAb and HRP. Based on the probe, an immunoassay was developed for ultrasensitive detection of κ-CN in bovine milk samples. The assay has a linear response range within 4.2-560 ng mL(-1). The limit of detection (LOD) was 4.2 ng mL(-1) which was 10 times lower than that of traditional McAb-HRP based ELISA. The recoveries of κ-CN from three brand bovine milk samples were from 95.8% to 111.0% that had a good correlation (R(2)=0.998) with those obtained by official standard Kjeldahl method. For higher sensitivity and as simple as the traditional ELISA, the developed immunoassay could provide an alternative approach for ultrasensitive detection of κ-CN in bovine milk sample.
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Affiliation(s)
- Y S Li
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - Y Zhou
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China.
| | - X Y Meng
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - Y Y Zhang
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - J Q Liu
- Production Quality Test Institute of Jilin Province, Changchun 130022, PR China
| | - Y Zhang
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - N N Wang
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - P Hu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - S Y Lu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - H L Ren
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - Z S Liu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
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Song F, Zhou Y, Li YS, Meng XM, Meng XY, Liu JQ, Lu SY, Ren HL, Hu P, Liu ZS, Zhang YY, Zhang JH. A rapid immunomagnetic beads-based immunoassay for the detection of β-casein in bovine milk. Food Chem 2014; 158:445-8. [PMID: 24731368 DOI: 10.1016/j.foodchem.2014.02.150] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [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: 10/19/2012] [Revised: 09/22/2013] [Accepted: 02/26/2014] [Indexed: 11/17/2022]
Abstract
An immunomagnetic beads-based enzyme-linked immunosorbent assay (IMBs-ELISA) was developed for the detection of β-casein in bovine milk. Immunomagnetic beads (IMBs) were employed as the solid phase. The anti-β-casein monoclonal antibody (McAb) bound to IMBs was used as capture probe and an anti-β-casein polyclonal antibody (PcAb), labelled with horseradish peroxidase (HRP), was employed as detector probe. Three reaction and two washing steps were needed. Each reaction needed 10 min or less, which significantly shortened detection compared with classic sandwich ELISA. β-Casein in bovine milk was detected across a linear range (2-128 μg mL(-1)). Application results were in accordance with the Kjejdahl method, which suggests the IMBs-ELISA is rapid and reliable for the detection of β-casein in bovine milk.
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Affiliation(s)
- F Song
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - Y Zhou
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China.
| | - Y S Li
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - X M Meng
- Grain and Oil Food Processing Key Laboratory of Jilin Province, Jilin Business and Technology College, Changchun 130062, PR China
| | - X Y Meng
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - J Q Liu
- Production Quality Test Institute of Jilin Province, Changchun 130022, PR China
| | - S Y Lu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - H L Ren
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - P Hu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - Z S Liu
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - Y Y Zhang
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
| | - J H Zhang
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China
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Sun Y, Li YS, Yang JW, Yu J, Wu YP, Li BX. Exposure to atrazine during gestation and lactation periods: toxicity effects on dopaminergic neurons in offspring by downregulation of Nurr1 and VMAT2. Int J Mol Sci 2014; 15:2811-25. [PMID: 24552878 PMCID: PMC3958883 DOI: 10.3390/ijms15022811] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [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: 12/30/2013] [Revised: 01/16/2014] [Accepted: 01/17/2014] [Indexed: 01/25/2023] Open
Abstract
High atrazine (2-chloro-4-ethytlamino-6-isopropylamine-1,3,5-triazine; ATR) contents in the environment threaten the health conditions of organisms. We examined the effects of ATR exposure on Sprague-Dawley rats during gestation and on the dopaminergic neurons of offspring during lactation. Pregnant dams were orally treated with 0 mg/kg/day to 50 mg/kg/day of ATR from gestational day 5 to postnatal day 22. Afterward, neither offspring nor dams received ATR. Dopamine (DA) content was examined in striatum samples by HPLC-FL; the mRNA expressions of tyrosine hydroxylase (TH), orphan nuclear hormone (Nurr1), dopamine transporter (DAT), and vesicular monoamine transporter 2 (VMAT2) in the ventral midbrain samples were examined by fluorescence PCR when the offspring reached one year of age. After the pregnant rats were exposed to ATR, the DA concentrations and mRNA levels of Nurr1 were decreased in their offspring. Decreased Nurr1 levels were also accompanied by changes in the mRNA levels of VMAT2, which controls the transport and reuptake of DA.
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Affiliation(s)
- Yan Sun
- Department of Toxicology, School of Public Health, Harbin Medical University, Harbin 150081, China.
| | - Yan-Shu Li
- Department of Toxicology, School of Public Health, Harbin Medical University, Harbin 150081, China.
| | - Jun-Wei Yang
- Department of Toxicology, School of Public Health, Harbin Medical University, Harbin 150081, China.
| | - Jia Yu
- Department of Toxicology, School of Public Health, Harbin Medical University, Harbin 150081, China.
| | - Yan-Ping Wu
- Department of Toxicology, School of Public Health, Harbin Medical University, Harbin 150081, China.
| | - Bai-Xiang Li
- Department of Toxicology, School of Public Health, Harbin Medical University, Harbin 150081, China.
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Li YS, Piao YG, Nagaoka K, Watanabe G, Taya K, Li CM. Preventive effect of tert-butylhydroquinone on scrotal heat-induced damage in mouse testes. Genet Mol Res 2013; 12:5433-41. [PMID: 24301916 DOI: 10.4238/2013.november.11.5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
To investigate the effect of tert-butylhydroquinone (tBHQ) on scrotal heat-induced damage in mice testes, 8-week-old mice were divided into 6 groups and administered with or without tBHQ through diet (10 mg/g), intraperitoneal injection (100 mg/kg body weight), or intratestis injection (12.5 mg/kg body weight), respectively. After single scrotal heat exposure (42 °C for 25 min), trunk blood and testes were collected 48 h later. The testes from diet and intraperitoneal tBHQ-treated mice showed more compact interstitial cells and less germ cell loss in the seminiferous epithelium compared with their corresponding non-tBHQ groups. However, intratestis tBHQ treatment showed no marked difference relative to the non-treatment group. In addition, pre-treatment of tBHQ caused lower testosterone concentrations and reduced expression of cytochrome P450 17α-hydroxylase/17,20-lyase (CYP 17) compared to the corresponding non-tBHQ groups. The results indicated that scrotal heat-induced structural damage was partly prevented by pre-treatment of tBHQ, which could be used as an effective antioxidant for preventing scrotal heat-mediated male infertility.
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Affiliation(s)
- Y S Li
- College of Animal Science and Technology, Nanjing Agricultural University, Nanjing, China
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65
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Zhou Y, Li YS, Meng XY, Zhang YY, Yang L, Li ZH, Zhang JH, Wang XR, Liu JQ, Lu SY, Ren HL, Hu P, Liu ZS. Production of a monoclonal antibody and development of an immunoassay for detection of Cr(III) in water samples. Chemosphere 2013; 93:2467-2472. [PMID: 24103439 DOI: 10.1016/j.chemosphere.2013.08.088] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 08/26/2013] [Accepted: 08/30/2013] [Indexed: 06/02/2023]
Abstract
In this study we report the production of a monoclonal antibody (Mab) specific for Cr(III)-chelate and the development of a competitive immunoassay for detection of Cr(III) in water samples. In the assay, the complete antigen (Cr(III)-ITCBE-BSA) was used as coating antigen, and Cr(III)-ITCBE as competitor competes with coating antigen to bind with Mab. Using this approach, the spiked water samples with Cr(III) were detected. The linear range of the detection was 0.7-12.4 ng mL(-1). The limit of the detection (LOD) was 0.51 ng mL(-1). The spiked results were also confirmed by ICP-MS, which showed a good correlation (R(2)=0.997) between the two methods. The results indicated that the developed assay was reliable and suitable for the detection of Cr(III) in water samples.
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Affiliation(s)
- Y Zhou
- Key Laboratory of Zoonosis, Ministry of Education, Institute of Zoonosis/College of Veterinary Medicine, Jilin University, Changchun 130062, PR China.
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66
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Li YS, Sun Y, Wang FG, Xing FW. Isolation and characterization of microsatellite loci in Euphorbia lamarckii Sweet (Euphorbiaceae) from the Canary Islands. CONSERV GENET RESOUR 2013. [DOI: 10.1007/s12686-013-0076-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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67
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Li XJ, He LL, Li YS, Yang Q, Hirose A. Direct coating adherent diamond films on Fe-based alloy substrate: the roles of Al, Cr in enhancing interfacial adhesion and promoting diamond growth. ACS Appl Mater Interfaces 2013; 5:7370-7378. [PMID: 23829602 DOI: 10.1021/am401709j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Direct CVD deposition of dense, continuous, and adherent diamond films on conventional Fe-based alloys has long been considered impossible. The current study demonstrates that such a deposition can be realized on Al, Cr-modified Fe-based alloy substrate (FeAl or FeCrAl). To clarify the fundamental mechanism of Al, Cr in promoting diamond growth and enhancing interfacial adhesion, fine structure and chemical analysis around the diamond film-substrate interface have been comprehensively characterized by transmission electron microscopy. An intermediate graphite layer forms on those Al-free substrates such as pure Fe and FeCr, which significantly deteriorates the interfacial adhesion of diamond. In contrast, such a graphite layer is absent on the FeAl and FeCrAl substrates, whereas a very thin Al-rich amorphous oxide sublayer is always identified between the diamond film and substrate interface. These comparative results indicate that the Al-rich interfacial oxide layer acts as an effective barrier to prevent the formation of graphite phase and consequently enhance diamond growth and adhesion. The adhesion of diamond film formed on FeCrAl is especially superior to that formed on FeAl substrate. This can be further attributed to a synergetic effect including the reduced fraction of Al and the decreased substrate thermal-expansion coefficient on FeCrAl in comparison with FeAl, and a mechanical interlocking effect due to the formation of interfacial chromium carbides. Accordingly, a mechanism model is proposed to account for the different interfacial adhesion of diamond grown on the various Fe-based substrates.
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Affiliation(s)
- X J Li
- Shenyang National Lab of Materials Science, Institute of Metal Research, University of Chinese Academy of Sciences, Shenyang 110016, China
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68
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Ling YH, Ding JP, Zhang XD, Wang LJ, Zhang YH, Li YS, Zhang ZJ, Zhang XR. Characterization of microRNAs from goat (Capra hircus) by Solexa deep-sequencing technology. Genet Mol Res 2013; 12:1951-61. [PMID: 23913378 DOI: 10.4238/2013.june.13.4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
MicroRNAs (miRNAs) are an important class of small noncoding RNAs that are highly conserved in plants and animals. Many miRNAs are known to mediate a myriad of cell processes, including proliferation and differentiation, via the regulation of some transcription and signaling factors, which are closely related to muscle development and disease. In this study, small RNA cDNA libraries of Boer goats were constructed. In addition, we obtained the goat muscle miRNAs by using Solexa deep-sequencing technology and analyzed these miRNA characteristics by combining it with the bioinformatics technology. Based on Solexa sequencing and bioinformatics analysis, 562 species-conserved and 5 goat genome-specific miRNAs were identified, 322 of which exceeded 100 in the expression levels. The results of real-time quantitative polymerase chain reaction from 8 randomly selected miRNAs showed that the 8 miRNAs were expressed in goat muscle, and the expression patterns were consistent with the Solexa sequencing results. The identification and characterization of miRNAs in goat muscle provide important information on the role of miRNA regulation in muscle growth and development. These data will help to facilitate studies on the regulatory roles played by miRNAs during goat growth and development.
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Affiliation(s)
- Y H Ling
- College of Animal Science and Technology, Anhui Agricultural University, Hefei, China
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69
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Li JF, Zhan JM, Li YS, Wai OWH. CO2 absorption/emission and aerodynamic effects of trees on the concentrations in a street canyon in Guangzhou, China. Environ Pollut 2013; 177:4-12. [PMID: 23455396 DOI: 10.1016/j.envpol.2013.01.016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2011] [Revised: 01/08/2013] [Accepted: 01/18/2013] [Indexed: 06/01/2023]
Abstract
In this paper, the effects of trees on CO2 concentrations in a street canyon in Guangzhou, China are examined by Computational Fluid Dynamics (CFD) simulations of the concentration distribution, taking into account both the CO2 absorption/emission and aerodynamic effects of trees. Simulation results show that, under a 2 m/s southerly prevailing wind condition, CO2 absorption by trees will reduce the CO2 concentration by around 2.5% in the daytime and at the same time the trees' resistance will increase the difference of CO2 concentrations in the street and at the inflow by 43%. As the traffic density increases to 50 vehicles/min, the effect of trees on the ambient CO2 concentration will change from positive to negative. At night, trees have a negative effect on the concentration in the street canyon mainly because of their resistance to airflow. When environmental wind changes, the effect of trees will be different.
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Affiliation(s)
- Jian-Feng Li
- Dept. of Applied Mechanics and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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Huang XZ, Zhong XX, Lu Y, Li YS, Rider AE, Furman SA, Ostrikov K. Plasmonic Ag nanoparticles via environment-benign atmospheric microplasma electrochemistry. Nanotechnology 2013; 24:095604. [PMID: 23403974 DOI: 10.1088/0957-4484/24/9/095604] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Atmospheric-pressure microplasma-assisted electrochemistry was used to synthesize Ag nanoparticles (NPs) for plasmonic applications. It is shown that the size and dispersion of the nanoparticles can be controlled by variation of the microplasma-assisted electrochemical process parameters such as electrolyte concentration and temperature. Moreover, Ag NP synthesis is also achieved in the absence of a stabilizer, with additional control over the dispersion and NP formation possible. As the microplasma directly reduces Ag ions in solution, the incorporation of toxic reducing agents into the electrolytic solution is unnecessary, making this an environmentally friendly fabrication technique with strong potential for the design and growth of plasmonic nanostructures for a variety of applications. These experiments therefore link microplasma-assisted electrochemical synthesis parameters with plasmonic characteristics.
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Affiliation(s)
- X Z Huang
- Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
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71
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Shen CL, Kuo PC, Li YS, Lin GP, Huang KT, Ou SL, Chen SC. Effect of Ag underlayer on microstructures and perpendicular magnetic properties of CoPt nanocomposite thin films. J Nanosci Nanotechnol 2011; 11:11171-11175. [PMID: 22409079 DOI: 10.1166/jnn.2011.4044] [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] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
CoPt/Ag films were prepared by magnetron sputtering on glass substrates and subsequent annealing. The dependence of degree of ordering and magnetic properties on Ag film thickness and annealing conditions were investigated. It was found that the Ag underlayer played a dominant role in inducing the (001) texture of the CoPt film after annealing. CoPt films with a thickness about 20 nm and Ag underlayers with a thickness about 70 nm are easy to obtain a large degree of ordering and a perpendicular magnetic anisotropy after annealing at 700 degrees C for 30 min. CoPt/Ag films with out-of-plane coercivity (Hc (perpendicular)) in the range of 13.5-14.0 kOe and a out-of-plane squareness (S(perpendicular)) of 0.97 were obtained after annealing at 700 degrees C for 30 min. Ag underlayer is beneficial to enhance the Hc(perpendicular)and S(perpendicular) of CoPt film significantly. The degree of ordering and perpendicular magnetic properties of the CoPt films which deposited on Ag underlayer are larger than those of the single layer CoPt films.
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Affiliation(s)
- C L Shen
- Institute of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
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72
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Jiang CG, Lv L, Liu FR, Wang ZN, Liu FN, Li YS, Wang CY, Zhang HY, Sun Z, Xu HM. Downregulation of connective tissue growth factor inhibits the growth and invasion of gastric cancer cells and attenuates peritoneal dissemination. Mol Cancer 2011; 10:122. [PMID: 21955589 PMCID: PMC3192775 DOI: 10.1186/1476-4598-10-122] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [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: 05/15/2011] [Accepted: 09/28/2011] [Indexed: 12/14/2022] Open
Abstract
Background Connective tissue growth factor (CTGF) has been shown to be implicated in tumor development and progression. However, the role of CTGF in gastric cancer remains largely unknown. Results In this study, we showed that CTGF was highly expressed in gastric cancer tissues compared with matched normal gastric tissues. The CTGF expression in tumor tissue was associated with histologic grade, lymph node metastasis and peritoneal dissemination (P < 0.05). Patients with positive CTGF expression had significantly lower cumulative postoperative 5 year survival rate than those with negative CTGF expression (22.9% versus 48.1%, P < 0.001). We demonstrated that knockdown of CTGF expression significantly inhibited cell growth of gastric cancer cells and decreased cyclin D1 expression. Moreover, knockdown of CTGF expression also markedly reduced the migration and invasion of gastric cancer cells and decreased the expression of matrix metalloproteinase (MMP)-2 and MMP-9. Animal studies revealed that nude mice injected with the CTGF knockdown stable cell lines featured a smaller number of peritoneal seeding nodules than the control cell lines. Conclusions These data suggest that CTGF plays an important role in cell growth and invasion in human gastric cancer and it appears to be a potential prognostic marker for patients with gastric cancer.
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Affiliation(s)
- Cheng-Gang Jiang
- Department of Surgical Oncology, the First Affiliated Hospital of China Medical University, Shenyang, China
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Abstract
Accurate classification of stroke has significant impact on patient care and conduction of stroke clinical trials. The current systems such as TOAST, SSS-TOAST, Korean TOAST, and A–S–C–O have limitations. With the advent of new imaging technology, there is a need to have a more accurate stroke subclassification system. Chinese ischemic stroke subclassification (CISS) system is a new two step system aims at the etiology and then underlying mechanism of a stroke. The first step classify stroke into five categories: large artery atherosclerosis (LAA), including atherosclerosis of aortic arch and intra-/extracranial large arteries, cardiogenic stroke, penetrating artery disease, other etiology, and undetermined etiology. The second step is to further classify the underlying mechanism of ischemic stroke from the intracranial and extracranial LAA into the parent artery (plaque or thrombosis) occluding penetrating artery, artery-to-artery embolism, hypoperfusion/impaired emboli clearance, and multiple mechanisms. Although clinical validation of CISS is being planned, CISS is an innovative system that offers much more detailed information on the pathophysiology of a stroke.
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Affiliation(s)
- S Gao
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College Beijing, China
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Liu FR, Jiang CG, Li YS, Li JB, Li F. Cimetidine inhibits the adhesion of gastric cancer cells expressing high levels of sialyl Lewis x in human vascular endothelial cells by blocking E-selectin expression. Int J Mol Med 2011; 27:537-44. [PMID: 21327325 DOI: 10.3892/ijmm.2011.618] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Accepted: 01/11/2011] [Indexed: 11/05/2022] Open
Abstract
Cimetidine has been shown to have anti-metastatic activity and improves the survival of patients with colorectal cancer. One hypothesis is its modulation of the expression of the cell adhesion molecule by target organ endothelial cells. Because of the inconclusive results in clinical trials of gastric cancer, we investigated the effects of cimetidine on the adhesion of gastric cancer cells to activated endothelial cells and on the expression of some cell adhesion molecules. Human endothelial cells were pre-incubated with cimetidine for 6 h, incubated with the cytokine tumor necrosis factor for 4 h, and the endothelial surface expression of E-selectin was evaluated by flow cytometry, immunostaining and ELISA. Further, we investigated E-selectin mRNA expression by RT-PCR. Three gastric cancer cell lines (SGC-7901, MGC-803, BGC-823) and a normal gastric epithelial cell line, GES-1, were studied for the surface expression of sialyl Lewis x by flow cytometry and immunostaining. Adherence of CFSE-labeled gastric cancer cells and GES-1 cells to endothelial cell monolayers was determined. Cimetidine significantly reduced E-selectin expression of activated endothelial cells, but did not influence E-selectin expression at the mRNA level. Three gastric cancer cell lines expressed high levels of sialyl Lewis x, whereas GES-1 did not. Cimetidine also significantly decreased gastric cancer cell adherence to stimulated endothelial cells. The inhibition of E-selectin expression corresponded to the reduction of tumor cell adherence. The effects of cimetidine on tumor adhesion were almost nullified by pre-incubation with E-selectin and sialyl Lewis x antibody. Furthermore, there was no significant change of GES-1 adherence to endothelial cells by TNF-α, cimetidine, E-selectin and sialyl Lewis x antibody. The inhibiton of gastric cancer cell adherence to cytokine-stimulated endothelial cells treated with cimetidine appears to result from blocking endothelial E-selectin expression. These data support the hypothesis that cimetidine may exert its anti-metastatic effects in gastric cancer, in part, by inhibiting E-selectin/sialyl Lewis x-mediated adherence of gastric cancer cells to endothelial cells in the metastasis target organs.
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Affiliation(s)
- Fu-Rong Liu
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health and Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, P.R. China
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75
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Hsu CC, Hwang SJ, Tai TY, Chen T, Huang MC, Shin SJ, Wen CP, Shih YT, Yang HJ, Chang CT, Chang CJ, Loh CH, Fuh MT, Li YS, Chang HY. Cigarette smoking and proteinuria in Taiwanese men with Type 2 diabetes mellitus. Diabet Med 2010; 27:295-302. [PMID: 20536492 DOI: 10.1111/j.1464-5491.2010.02947.x] [Citation(s) in RCA: 14] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS Cigarette smoking is a well-known risk factor associated with diabetic nephropathy. The objective of this study was to further investigate the dose-response effect of tobacco exposure on proteinuria in males with Type 2 diabetes. METHODS Five hundred and nine males with Type 2 diabetes were selected from a cohort participating in a glucose control study in Taiwan. Pack-years of cigarette smoking were calculated to define tobacco exposure. Proteinuria was identified if albumin-to-creatinine ratio was > or = 30 mg/g in at least two of three consecutive urine tests. Logistic regression and trend tests were used to delineate the association between smoking status and proteinuria. RESULTS Compared with non-smokers, those who had smoked 15-30 or more than 30 pack-years were respectively 2.78 (95% CI 1.34-5.76, P < 0.01) and 3.20 (95% CI 1.74-5.86, P < 0.001) times more likely to develop proteinuria. The dose-response effect of tobacco exposure on the development of proteinuria is highly significant in all subjects (P = 0.001) and in subgroups with relatively short duration of diabetes mellitus (P < 0.001), good blood pressure control (P = 0.001) and those of young age (P = 0.007). CONCLUSIONS The current study shows a clear dose-response effect of cigarette smoking on development of proteinuria in male Type 2 diabetic patients. These findings reinforce the urgent need to encourage diabetic patients to stop smoking regardless of age, duration of diabetes mellitus or status of blood pressure control.
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Affiliation(s)
- C C Hsu
- Division of Health Policy Research and Development, Institute of Population Health Sciences, National Health Research Institutes, Zhunan, Taiwan
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Li YS, Tang Y, Yang Q, Maley J, Sammynaiken R, Regier T, Xiao C, Hirose A. Ultrathin W-Al dual interlayer approach to depositing smooth and adherent nanocrystalline diamond films on stainless steel. ACS Appl Mater Interfaces 2010; 2:335-338. [PMID: 20356176 DOI: 10.1021/am9007159] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The adherence of diamond coated on steel is commonly low and needs to be strengthened with thick intermediate layers. In this paper, a nanoscale W-Al dual metal interlayer has been applied on SS304 substrates to facilitate deposition of continuous, adherent and smooth diamond thin films. During the microwave plasma-enhanced chemical vapor deposition process, the Al inner layer 30 nm thick diffuses into steel surface inhibiting carbon diffusion and graphitization. The W outer layer 20 nm thick is transformed into W carbides, both preventing carbon diffusion and enhancing diamond nucleation. The diamond films synthesized are of high purity and have smooth surfaces and dense structures. Indentation and shear deformation tests indicate high delaminating tolerance of the diamond films.
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Abstract
Schistosomiasis continues to be a significant cause of parasitic morbidity and mortality worldwide. This review considers the basic features of the pathology and clinical outcomes of hepatointestinal and genitourinary schistosomiasis, presents an overview of the numerous studies on animal models that have clarified many of the immunopathological features, and provides insight into our current understanding of the immunopathogenesis and genetic control of human schistosomiasis. In murine schistosomiasis, pathology is induced by a CD4(+) Th2 driven granulomatous response directed against schistosome eggs lodged in the host liver. The Th2 cytokines IL-4 and IL-13 drive this response, whereas IL-10, IL13Ralpha2, IFN-gamma and a subset of regulatory T-cells act to limit schistosome induced pathology. A variety of cell types including hepatic stellate cells, alternatively activated macrophages and regulatory T-cells have also been implicated in the pathogenesis of schistosomiasis. Current knowledge suggests the immunopathogenic mechanisms underlying human schistosomiasis are likely to be similar. The review also considers the future development of anti-pathology schistosome vaccines. As fibrosis is an important feature of many other diseases such as Crohn's disease and sarcoidosis, a comprehensive understanding of the cellular and molecular mechanisms involved in schistosomiasis may also ultimately contribute to the development an effective disease intervention strategy for other granulofibrotic diseases.
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Affiliation(s)
- M L Burke
- The Queensland Institute of Medical Research, Herston, Australia
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78
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Guo H, Kwok NH, Cheng HR, Lee SC, Hung WT, Li YS. Formaldehyde and volatile organic compounds in Hong Kong homes: concentrations and impact factors. Indoor Air 2009; 19:206-17. [PMID: 19220507 DOI: 10.1111/j.1600-0668.2008.00580.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
UNLABELLED This paper presents formaldehyde and volatile organic compounds (VOC) concentrations, potential sources and impact factors in 100 homes. The 24-h average formaldehyde concentration in 37 homes exceeded the good class of the Hong Kong Indoor Air Quality Objectives (HKIAQO), whereas the total VOCs concentration in all homes was lower than the HKIAQO. Compared to other East Asian cities, indoor formaldehyde and styrene in Hong Kong was the highest, reflecting that the homes in Hong Kong were more affected by household products and materials. The formaldehyde concentration in newly built apartments was significantly higher than that in old buildings, whereas no relationship between the concentration and the building age was found for VOCs. There was no difference for formaldehyde and toluene between smoking and non-smoking homes, suggesting that cigarette smoking was not the major source of these two species. Homes of a couple with a child had higher formaldehyde and acetic acid concentrations, while homes with more than three people had higher concentrations of 1-butanol, heptane and d-limonene. When shoes were inside the homes, heptane, acetic acid, nonane and styrene concentrations were statistically higher than that when shoes were out of the homes. Furthermore, higher levels of 1,2,4-trimethylbenzene, styrene, nonane and heptane were found in gas-use families rather than in electricity-use homes. PRACTICAL IMPLICATIONS Long-term exposure to formaldehyde and volatile organic compounds (VOC) in indoor environments may cause a number of adverse health effects such as asthma, dizziness, respiratory and lung diseases, and even cancers. Therefore, it is critical to minimize indoor air pollution caused by formaldehyde and VOCs. The findings obtained in this study would significantly enhance our understanding on the levels, emission sources and factors which affect indoor concentrations of formaldehyde and VOCs. The results can help housing designers, builders, home residents, and housing department of the government to improve indoor air quality (IAQ) by means of appropriate building materials, clean household products and proper life styles. It can also help policy makers reconcile the IAQ objectives and guidelines.
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Affiliation(s)
- H Guo
- Research Centre for Urban Environmental Technology and Management, Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong.
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79
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Ying BW, Song XB, Fan H, Wang LL, Li YS, Cheng Z, Cheng H, Wen FQ. Plasma ghrelin levels and weight loss in Chinese Uygur patients with chronic obstructive pulmonary disease. J Int Med Res 2009; 36:1371-7. [PMID: 19094448 DOI: 10.1177/147323000803600626] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Ghrelin is an important orexigenic hormone that reduces fat oxidation and increases adiposity. This study investigated plasma ghrelin levels in Chinese Uygur patients with chronic obstructive pulmonary disease (COPD). Plasma ghrelin and anabolic and catabolic factors were measured in 38 patients and 24 control subjects. COPD patients were divided into two groups based on body mass index (BMI): underweight (BMI < 20 kg/m(2), n = 18) or normoweight (BMI > or = 20 kg/m(2), n = 20). Plasma ghrelin levels were found to be significantly higher in underweight than in normoweight patients or healthy controls. Circulating tumour necrosis factor-alpha and interleukin-6 concentrations were significantly higher in underweight than in normoweight patients, whereas insulin concentrations were significantly lower. Plasma ghrelin levels correlated negatively with forced expiratory volume in 1 s (FEV(1); r = 0.35), but did not significantly correlate with FEV(1)/forced vital capacity. Plasma ghrelin levels were elevated in underweight COPD patients and were associated with cachexia and abnormal pulmonary function.
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Affiliation(s)
- B W Ying
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
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80
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Li SW, Li YS, Tsui KC. Radioactivity in the atmosphere over Hong Kong. J Environ Radioact 2007; 94:98-106. [PMID: 17350146 DOI: 10.1016/j.jenvrad.2007.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2006] [Revised: 01/08/2007] [Accepted: 01/12/2007] [Indexed: 05/14/2023]
Abstract
Upper-air radioactivity soundings have been regularly conducted in Hong Kong since 1994. A total of 38 soundings, measuring the vertical profile of radioactivity in the atmosphere over Hong Kong using on-board Geiger-Müeller tubes, were made during the period 1994-2003 in different seasons and weather conditions. This paper presents the data obtained in Hong Kong and compares the composite vertical profile with observations in other parts of the world. The average Pfotzer maximum over Hong Kong was found to be at an altitude of around 16.1km, lower than those observed at higher latitudes. The variations of the Pfotzer maximum with geomagnetic rigidity and solar activity are discussed. Seasonal and local weather effects on radioactivity in the lower atmosphere were also studied.
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Affiliation(s)
- S W Li
- Hong Kong Observatory, Environmental Radiation Monitoring and Meteorological Measurements Division, 134A Nathan Road, Kowloon, Hong Kong, China.
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81
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Zhang Q, Tong MY, Li YS, Gao HJ, Fang XC. Extensive desulfurization of diesel by Rhodococcus erythropolis. Biotechnol Lett 2006; 29:123-7. [PMID: 17091384 DOI: 10.1007/s10529-006-9209-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2006] [Revised: 09/12/2006] [Accepted: 09/13/2006] [Indexed: 10/23/2022]
Abstract
The resting cells of a new isolate of Rhodococcus erythropolis FSD-2 were used to desulfurize diesel fuels. About 97% of the total sulfur content in the hydrodesulfurized diesel was removed by the two consecutive biodesulfurization (BDS) processes with the majority ( approximately 94%) being removed in the first treatment, resulting in diesel with a sulfur content of 5.7 microg ml(-1).
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Affiliation(s)
- Q Zhang
- Fushun Research Institute of Petroleum and Petrochemicals, SINOPEC, Fushun, PR China.
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82
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Bekker AY, Haile MM, Gorny A, Li YS, Quartermain D, Blanck TJJ. Moderate Hypoxia, Isoflurane Anesthesia, and Object Recognition in Adult Mice. J Neurosurg Anesthesiol 2006. [DOI: 10.1097/00008506-200610000-00028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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83
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Abstract
Schistosomes, snail-transmitted trematodes (blood flukes), cause a major parasitic disease that ranks second only to malaria in terms of human suffering in the tropics. Schistosoma japonicum has occupied its ecological niche in China for thousands of years; through natural selection it has evolved survival mechanisms that make it difficult (if not impossible) to eradicate. As discussed here by Allen Ross, Li Yuesheng, Adrian Sleigh and Don McManus, vaccination, in combination with current control strategies, may significantly reduce the morbidity of this disease and ultimately improve the quality of life for those living adjacent to endemic zones. This article provides a special focus in Hunan province and examines the potential impact of the Three Gorges Super Dam Project on schistosomiasis control.
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Affiliation(s)
- A G Ross
- Tropical Health Program, Australian Center for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, 300 Herston Road, Herston, Brisbane, Queensland 4029, Australia.
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84
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Chiou CS, Chang CF, Chang CY, Wu YP, Chang CT, Li YS, Chen YH. Mineralization of polyethylene glycol in aqueous solution by hydrogen peroxide with basic oxygen furnace slag. Environ Technol 2004; 25:1357-1365. [PMID: 15691196 DOI: 10.1080/09593332508618468] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This study evaluated the dissolution behavior of basic oxygen furnace slag (BOF slag) and the performance of H2O2 with BOF slag denoted as H2O2/BOF slag process to degrade polyethylene glycol (PEG) in the aqueous solution. The concentration of total organic carbon (TOC) was chosen as a mineralization index of the degradation of PEG by the H2O2/BOF slag process. A first-order kinetic model with respect to TOC was adopted to represent the mineralization of PEG by H2O2/BOF slag process. The experimental results in this study suggested that dosages with 3.98 x 10(-4) mole min(-1) l(-1) H2O2 and 15 g l(-1) BOF slag loading in the solution at pH 2 provided the optimal operation conditions for the mineralization of PEG yielding a 75.5% treatment efficiency at 100 min reaction time. The H2O2/Fe2+ ratio was then determined to be 13.5:1.
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Affiliation(s)
- C S Chiou
- Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan
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85
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Li YS, Chen X, Wai OWH, King B. Study on the dynamics of algal bloom and its influence factors in Tolo Harbour, Hong Kong. Water Environ Res 2004; 76:2643-54. [PMID: 16042112] [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: 05/03/2023]
Abstract
In this paper, the semi-enclosed bay named Tolo Harbour and Channel in Hong Kong, which was frequently attacked by red tides, was used as a case study. Data sets related to marine water quality, river nutrients, and meteorological conditions recorded between 1988 and 1999 were chosen for statistical analysis. A multivariate analysis showed that algal growth, represented by the chlorophyll a concentration, had obvious spatial and temporal variations in the study area. The chlorophyll a concentration had a consistently decreasing trend from the inner part of the Harbour and surface waters to the outer part and bottom waters. The temporal variations had a markedly seasonal variation with high bioproductivity in spring and winter. There were long-term fluctuations in the chlorophyll a concentration with a high-low-high pattern in the study period. Nutrients and hydrological and meteorological conditions were important factors of algal bloom. Besides nitrogen, which was the most critical factor of algal bloom for the whole water body, total phosphorus in the surface waters and phosphate (PO4) and silica (SiO2) in the bottom waters also showed strongly positive or negative correlations with the chlorophyll a level. For the meteorological conditions, global solar radiation was the key factor of massive algal bloom in the study period, while rainfall and wind direction were the most important factors of seasonal variation.
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Affiliation(s)
- Y S Li
- Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, P R China.
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86
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Ip CCM, Li XD, Zhang G, Farmer JG, Wai OWH, Li YS. Over one hundred years of trace metal fluxes in the sediments of the Pearl River Estuary, South China. Environ Pollut 2004; 132:157-72. [PMID: 15276283 DOI: 10.1016/j.envpol.2004.03.028] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2003] [Accepted: 03/16/2004] [Indexed: 05/22/2023]
Abstract
The rapid economic development in the Pearl River Delta (PRD) region in South China in the last three decades has had a significant impact on the local environment. Estuarine sediment is a major sink for contaminants and nutrients in the surrounding ecosystem. The accumulation of trace metals in sediments may cause serious environmental problems in the aquatic system. Thirty sediment cores were collected in the Pearl River Estuary (PRE) in 2000 for a study on trace metal pollution in this region. Heavy metal concentrations and Pb isotopic compositions in the four 210Pb-dated sediment cores were determined to assess the fluxes in metal deposits over the last one hundred years. The concentrations of Cu, Pb and Zn in the surface sediment layers were generally elevated when compared with the sub-surface layers. There has been a significant increase in inputs of Cu, Pb and Zn in the PRE since the 1970s. The results also showed that different sampling locations in the estuary received slightly different types of inputs. Pb isotopic composition data indicated that the increased Pb in the recent sediments was of anthropogenic origin. The results of trace metal influxes showed that about 30% of total Pb and 15% of total Zn in the sediments in the 1990s were from anthropogenic sources. The combination of trace metal analysis, Pb isotopic composition and 210Pb dating in an estuary can provide vital information on the long-term accumulation of metals in sediments.
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Affiliation(s)
- C C M Ip
- Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, China
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87
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Li YS, Kardorff R, Richter J, Sun KY, Zhou H, McManus DP, Hatz C. Ultrasound organometry: the importance of body height adjusted normal ranges in assessing liver and spleen parameters among Chinese subjects with Schistosoma japonicum infection. Acta Trop 2004; 92:133-8. [PMID: 15350865 DOI: 10.1016/j.actatropica.2004.06.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2003] [Revised: 05/25/2004] [Accepted: 06/15/2004] [Indexed: 11/28/2022]
Abstract
Hepatosplenic measurements among 550 Chinese subjects, aged 3-59 years from Yueyang city--a nonendemic area for schistosomiasis in Hunan province, China--were performed to define normal ranges of ultrasound organometry for assessing hepatosplenic morbidity in Schistosoma japonicum infection. Measurements included the size of the liver (left lobe and right lobe), the main portal vein stem, the peripheral periportal vein branches, and spleen length and thickness. The results document the significant relationship between body height and organometric parameters. The reference values stratified by body height improve the accuracy of assessment. Thus, height-based normal ranges established in this study can be applied in hospital routine and in field studies of patients infected with S. japonicum in Hunan province and in other endemic areas of China.
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Affiliation(s)
- Y S Li
- Tropical Health Program, Australian Centre for International and Tropical Health and Nutrition, The Queensland Institute of Medical Research, The University of Queensland, 3000 Herston Road, Herston, Brisbane, Qld 4029, Australia.
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88
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Abstract
The formation and dynamics of turbidity maxima (TM) in the Pearl River estuary (PRE) are not well understood but the existence of TM in the estuary have great potential engineering and environmental impacts. Based on the measurements of two large-scale field surveys conducted in the wet season of 1978 (July of 1978) and the dry season of 1979 (March of 1979), the existence and seasonal variations of TM in the PRE focusing on the two major natural navigation channels have been studied. The sediment transport fluxes over two consecutive tidal cycles have been analyzed in detail. The analysis results reveal that the formation mechanisms of TM in the estuary are rather complex. In general, gravitational circulation, tidal trapping, and sediment resuspension and deposition processes are the primary TM formation mechanisms in the PRE. The clockwise back flow pattern around Lingding Island also leads to the formation of TM in the West channel of the PRE. The occurrence of TM far upstream of the salt water wedge is the result of the complex hydrodynamic and sediment transport processes generated by the runoff of the major rivers.
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Affiliation(s)
- O W H Wai
- Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
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89
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He ZG, Li YS, Zhang TH, Tang X, Zhao C, Zhang RH. Effects of 2-hydroxypropyl-beta-cyclodextrin on pharmacokinetics of digoxin in rabbits and humans. Pharmazie 2004; 59:200-2. [PMID: 15074593] [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: 04/29/2023]
Abstract
Considering the narrow therapeutic index of digoxin and the low range between the safe and toxic serum concentrations of this drug, to evaluate the relative bioavailability of tablets and oral solution is necessary. The pharmacokinetic properties of digoxin after oral administration of its hydroxypropyl-beta-cyclodextrin (HPCD) inclusion complex to rabbits and human volunteers were investigated in comparison with those of commercially available tablets. The aqueous solubility of digoxin was enhanced by HPCD for about 2000 times at HPCD concentration of 50% (w/v). But in a human bioavailability study no significant difference was observed in the extent of absorption (AUC(0-t)) and Cmax between the two formulations. Time to reach peak was significantly shorter for the solution than for the tablets (p < 0.01). The pharmacokinetic results from the rabbit study were similar to human studies and no significant difference was observed for AUC, Cmax and Tmax. As the bioavailability of both tablets and solution is equivalent HPCD based oral digoxin solution could serve as an alternative to tablets.
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Affiliation(s)
- Z G He
- School of Pharmacy, Department of Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.
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90
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Li YS, He YK, Zeng QR, McManus DP. Epidemiological and morbidity assessment of Schistosoma japonicum infection in a migrant fisherman community, the Dongting Lake region, China. Trans R Soc Trop Med Hyg 2004; 97:177-81. [PMID: 14584373 DOI: 10.1016/s0035-9203(03)90112-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [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: 11/21/2022] Open
Abstract
We assessed the epidemiology and morbidity related to Schistosoma japonicum infection by both parasitological (Kato-Katz method and miracidium hatching test) and ultrasound examination in a migrant fisherman community (n = 106) from the Dongting Lake region in China in 2001. A prevalence of 69.8% and a mean infection intensity of 66.5 eggs per gram (epg) were recorded for this group. Males had a higher level of infection (77%) and intensity (92.2 epg) compared with females (58% and 28.6 epg, respectively). Subjects aged 11-20 years had the highest prevalence of infection (91%) and the heaviest infection intensity (85.3 epg) among all age groups. Twenty-six percent of the subjects had not been treated previously for schistosomiasis. Parenchymal fibrosis (> or = stage II) detected by ultrasound and spleen enlargement (or splenectomy) occurred in 37% and 9% of subjects, respectively. Portal vein dilation was detected in 18% subjects, and 58% (11/19) of those patients with portal vein enlargement were shown to have parenchymal fibrosis (> or = stage II). These results indicate that S. japonicum infection and related morbidity in mobile fisherman is still unacceptably high despite the fact that China has implemented a Schistosomiasis Control Project financed by a World Bank Loan for a period of 8 years since 1992. Clearly, new approaches for schistosomiasis control, especially in communities like these mobile fishermen, should be explored.
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Affiliation(s)
- Y S Li
- Molecular Parasitology Laboratory, Australian Centre for International and Tropical Health and Nutrition, Queensland Institute of Medical Research, University of Queensland, Brisbane, Australia
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91
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Li YS, Li B, Han NY, Xu BJ. Studies on a poly(styrene-divinylbenzene)-encapsulated sub-micrometer sized organic–inorganic hybrid silica packing, its synthesis, some of its characteristics and applications. J Chromatogr A 2003; 1021:183-9. [PMID: 14735987 DOI: 10.1016/j.chroma.2003.09.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [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: 11/22/2022]
Abstract
The hydrolyzed product of a mixture of tetraethoxysilane (TEOS) and vinyltriethoxysilane (VTEOS) was used to produce organic-inorganic hybrid silica by sol-gel processing. The product was a kind of composite with vinyl groups incorporated into the structure of the final particles through C-Si bonds. These hybrid silica particles were spherical and the average diameter was about 350 nm as measured by scanning electron microscopy (SEM). The particles were non-porous as proved by BET method. The hybrid silica particles were subsequently encapsulated with a layer of PS-DVB, a polymeric mixture of styrene and divinylbenzene, with the vinyl groups on the particle surface as anchors of the polymer chains. The encapsulated packing was used as stationary phases in CEC, and the chromatographic behaviors were studied. Experimental results showed that, as expected, the smaller diameter stationary phase resulted in higher column efficiencies. In comparison with the columns packed with 5 microm diameter encapsulated-silica stationary phases of the same kind and other sub-micron stationary phases reported, it can be concluded that the EOF velocity is independent of the particle diameter when using 350 nm phase, but determined by the surface nature of the stationary phase.
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Affiliation(s)
- Y S Li
- Department of Analytical Chemistry, School of Pharmaceutical Science, Peking University, Beijing 100083, PR China
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92
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Li YS, Chen YZ, Lin CX, Lu CJ, Ye XP, Wu JY, Lin JX. [Occurrence of Pagumogonimus veocularis in Fujian Province]. Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi 2003; 18:296-300. [PMID: 12567641] [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: 02/28/2023]
Abstract
OBJECTIVE To prove that Fujian Province is also a natural focus of Pagumogonimus veocularis(Pv). METHODS The adult worms were obtained from a cat fed with Pv metacercariae. RESULTS Pv were found in Jianou, Fujian Province. All 1,873 Semisulcospira libertina showed negative. The positive rate of Tricula fujianensis and Erhaia jianouenesis were 0.10% (1/695) and 0.25% (5/2,038), respectively. The main crab host was S. fujianensis. Ps alone and mixed infection with Pv were found in the Sinopotamon, the infection rates were 36.8% (43/117) and 20.5% (24/117), respectively. The numbers of the metacercariae were 806 and 40, respectively. A cat was infected with 12 metacercriae of Pv, eggs were found in the stool 56 days after infection, and 6 worms were found in the lungs 68 days after infection. CONCLUSION Fujian is one of the natural focus of Pv, cat is the adequate host. The fluke was identified as Pv according to the characteristics of the metacercariae.
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Affiliation(s)
- Y S Li
- Institute of Parasitic Diseases of Fujian, Fuzhou 350001
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93
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He YK, Liu SX, Zhang XY, Song GC, Luo XS, Li YS, Xu YX, Yu XL, Li Y, Hou XY, McManus DP. Field assessment of recombinant Schistosoma japonicum 26 kDa glutathione S-transferase in Chinese water buffaloes. Southeast Asian J Trop Med Public Health 2003; 34:473-9. [PMID: 15115115] [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: 04/29/2023]
Abstract
We have shown previously that anti-fecundity immunity can be induced experimentally against recombinant 26 kDa glutathione S-transferase (reSjc26GST) in Chinese water buffaloes (Bos buffelus), important reservoir hosts for Schistosoma japonicum in China. In the field study described here, we immunized buffaloes with reSjc26GST to induce protective immunity against S. japonicum and to evaluate its effectiveness in controlling schistosomiasis japonica. We selected two villages as test and control groups in inside-embankment areas endemic for schistosomiasis japonica. The buffaloes in the test village were vaccinated with reSjc26GST, whereas those in the control village were not. The indicators of the effect of the vaccine included the generation of specific IgG antibodies in the vaccinated buffaloes, changes in the prevalence and infection intensity in buffaloes and village children, changes in the density of infected snails, and changes in the infectivity of water bodies (assessed by sentinel mice) in transmission areas adjacent to both villages. Twenty months after vaccination, the infection rate of buffaloes in the test village was decreased by 60.4% (from an initial prevalence of 13.5% to 5.4%), and 67.9% when compared with that in the control village (initial prevalence of 16.7%). However, the infection rate in village children remained unchanged. The density of infected snails decreased by 71.4%, from 0.0049/0.11 m2 to 0.0014/0.11m2 in the high transmission area outside the embankment in the test village. There was no change in the infectivity of the water body transmission areas between the test and control villages. The levels of specific antibodies to reSjc26GST showed a continuous increase after vaccination. These results indicate that protective immunity was induced and maintained in buffaloes after vaccination with reSjc26GST. The vaccine could thus play a significant role in reducing S. japonicum transmission caused by water buffaloes in the Lake region of China.
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Affiliation(s)
- Y K He
- Hunan Institute of Parasitic Diseases and WHO Collaborating Center for Research and Control on Schistosomiasis in the Lake Region, Hunan
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94
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Weyts FAA, Li YS, van Leeuwen J, Weinans H, Chien S. ERK activation and alpha v beta 3 integrin signaling through Shc recruitment in response to mechanical stimulation in human osteoblasts. J Cell Biochem 2003; 87:85-92. [PMID: 12210725 DOI: 10.1002/jcb.10278] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [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: 11/06/2022]
Abstract
Osteoblast growth and differentiation are critical processes for bone development and maintenance, and are regulated by both humoral and mechanical factors. Humoral (hormonal) factors can affect gene transcription via MAPkinases, e.g., extracellular signal-regulated kinase (ERK). We studied whether the ERK pathway is also involved in processing mechanical inputs in human bone cells. Exposing MG63 cells to physiologically relevant levels of fluid flow resulted in ERK phosphorylation. Genistein blocked this response, indicating that it is dependent on tyrosine phosphorylation. Furthermore, alpha v beta 3 integrins were activated in response to fluid flow, as shown by recruitment of adaptor molecule Shc and clustering of alpha v beta 3 in focal adhesion-like structures. Antibodies blocking formation of beta 1 or beta 3 integrin-matrix interactions or RGD peptides could not inhibit fluid flow-induced ERK phosphorylation, suggesting that formation of new integrin-matrix interactions is not essential for this response and that other upstream mechanosensors regulate induction of ERK phosphorylation in response to fluid flow in human bone cells.
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Affiliation(s)
- F A A Weyts
- Department of Orthopaedics, Department of Internal Medicine, Erasmus University Medical Center Rotterdam, 3000 DR Rotterdam, The Netherlands.
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Liu WX, Li XD, Shen ZG, Wang DC, Wai OWH, Li YS. Multivariate statistical study of heavy metal enrichment in sediments of the Pearl River Estuary. Environ Pollut 2003; 121:377-88. [PMID: 12685766 DOI: 10.1016/s0269-7491(02)00234-8] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The concentrations and chemical partitioning of heavy metals in the sediment cores of the Pearl River Estuary were studied. Based on Pearson correlation coefficients and principal component analysis results, Al was selected as the concentration normalizer for Pb, while Fe was used as the normalizing element for Co, Cu, Ni and Zn. In each profile, sections with metal concentrations exceeding the upper 95% prediction interval of the linear regression model were regarded as metal enrichment layers. The heavy metal accumulation mainly occurred at sites in the western shallow water areas and east channel, which reflected the hydraulic conditions and influence from riparian anthropogenic activities. Heavy metals in the enrichment sections were evaluated by a sequential extraction method for possible chemical forms in sediments. Since the residual, Fe/Mn oxides and organic/sulfide fractions were dominant geochemical phases in the enriched sections, the bioavailability of heavy metals in sediments was generally low. The 206Pb/207Pb ratios in the metal-enriched sediment sections also revealed the influence of anthropogenic sources. The spatial distribution of cumulative heavy metals in the sediments suggested that the Zn and Cu mainly originated from point sources, while the Pb probably came from non-point sources in the estuary.
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Affiliation(s)
- W X Liu
- Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
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96
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Li YS, Sleigh AC, Li Y, Tanner M, Dessein A, Williams GM, McManus DP. Five-year impact of repeated praziquantel treatment on subclinical morbidity due to Schistosoma japonicum in China. Trans R Soc Trop Med Hyg 2002; 96:438-43. [PMID: 12497984 DOI: 10.1016/s0035-9203(02)90386-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [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: 12/01/2022] Open
Abstract
We report the 5-year impact (1996-2001) of repeated praziquantel chemotherapy on subclinical morbidity related to Schistosoma japonicum infection. We repeated stool examinations and hepatosplenic ultrasonography in a cohort of 120 individuals living on an island with endemic infection in Dongting Lake, China. Prevalence of schistosome infection fell by 43% and intensity (geometric mean eggs per gram) declined by 80% over the 5 years. However, transmission persisted at a dangerously high rate of 13% per year for re-infection or new infection in the cohort. The prevalence of left-lobe enlargement and dilated portal vein fell significantly (P < 0.01) to about half initial levels although a few patients progressed during the study period. At study endpoint, infection was nearly twice as common if the portal vein was dilated (23% versus 13%, respectively), but this association was not statistically significant (P > 0.05). However, endpoint infection was even more strongly associated with left-lobe enlargement (57% versus 15%, P < 0.01). The proportions of subjects with improved parenchymal and periportal fibrosis were much higher than the proportions of subjects that progressed (P < 0.05). Reduction of prevalence and intensity of infection, and improvement of subclinical morbidity, were benefits of repeated treatments. Further research is needed to understand why some patients developed fibrosis despite substantial reductions in egg counts and to evaluate the functional importance of residual subclinical morbidity after chemotherapy-based control in the lake and marshland area of China.
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Affiliation(s)
- Y S Li
- Tropical Health Programme, Australian Centre for International and Tropical Health and Nutrition, Queensland Institute of Medical Research, University of Queensland, 300 Herston Road, Herston, Brisbane, Queensland 4029, Australia
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97
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Li Y, Yu DB, Li YS, Luo XS, Liang YS, Bartley PB, McManus DP. Antibody isotype responses to Schistosoma japonicum antigens in subjects from a schistosomiasis area with repeated praziquantel chemotherapy compared with a new endemic zone in Hunan Province, P.R. China. Trans R Soc Trop Med Hyg 2002; 96:210-5. [PMID: 12055818 DOI: 10.1016/s0035-9203(02)90310-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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: 10/26/2022] Open
Abstract
To demonstrate the dynamics of specific antibody isotypes against schistosome adult worm (AWA) and soluble egg (SEA) antigens, we evaluated (in 1999-2000) 112 subjects infected with Schistosoma japonicum from 2 regions of Hunan Province, China. Fifty-eight subjects were from Area A, a well-known endemic area with repeated chemotherapy. Area B (n = 54) is a new endemic focus in another part of the same province. Serum samples were collected prior to praziquantel (PZQ) chemotherapy, and at 2 and 12 months post-treatment. IgM, IgA, IgG, IgG2, IgG4 and IgE antibodies to AWA and SEA were measured by quantitative enzyme-linked immunosorbent assay (ELISA). Pre-treatment antibody isotype levels from Area A, except IgA against AWA and SEA, were significantly higher than those from Area B. In response to chemotherapy, most antibody isotype levels fell or remained stable. However, in Area A there was a significant increase in the IgA, IgE and IgG4 responses to AWA 2 months after PZQ--which fell to approach pre-treatment levels by 12 months. A similar response was seen in Area B with IgE and IgG4 to AWA. Levels of all AWA-specific IgE and IgG4 were significantly higher in subjects from Area A compared with Area B at all time-points. AWA-IgE levels demonstrated significant linear correlations with age and number of previous PZQ treatments in Area A only. All SEA-specific isotypes in both areas fell significantly in response to treatment--except IgE, which remained stable in both area. All SEA-specific isotype levels (except IgA) were significantly higher from Area A at baseline. This significant difference was maintained through 12-months follow-up for IgE, IgG2 and IgG4 only. This study suggests that multiple episodes of schistosome infection may be required to generate antibody isotype levels that have been associated with resistance to re-infection in other studies. Further, a surrogate marker of successful chemotherapy (AWA-IgG4) performed less effectively in patients with previous treatment courses.
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Affiliation(s)
- Y Li
- Hunan Institute of Parasitic Diseases, WHO Collaborating Centre for Research and Control of Schistosomiasis in Lake Regions, Huabanqiao Road, Yueyang, Hunan 414000, China
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98
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Li YS, Luo SD, Zhang M, Chen JJ, Wang ZT. [Constituents of Liguliria vellerea (Franch.) Hand-Mazz]. Zhongguo Zhong Yao Za Zhi 2001; 26:835-7. [PMID: 12776330] [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: 03/02/2023]
Abstract
OBJECTIVE To study the chemical constituents of Ligularia vellerea. METHOD The compounds were isolated by column chromatography, and the structures were identified by NMR spectral data and other methods. RESULT AND CONCLUSION Seven compounds were isolated and identified as 4-hydroxyacetophenone, 8 alpha-hydroxy-7(11)-eremophilen-12, 8 beta-olide, umbelliferone, tiglic acid, 6 beta-hydroxy-7(11)-eremophilen-12, 8 alpha-olide, daucosterin, beta-sitosterol and stigmasterol. All the compounds were isolated for the first time from this plant.
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Affiliation(s)
- Y S Li
- Department of Pharmacognosy, China Pharmaceutical University, Nanjing 210038, Jiangsu, China
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99
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Li XD, Mai BX, Zhang G, Sheng GY, Fu JM, Pan SM, Wai OW, Li YS. Distribution of organochlorine pesticides in a sediment profile of the Pearl River estuary. Bull Environ Contam Toxicol 2001; 67:871-880. [PMID: 11692203 DOI: 10.1007/s001280203] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2000] [Accepted: 08/07/2001] [Indexed: 05/23/2023]
Affiliation(s)
- X D Li
- Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
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100
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Chen BP, Li YS, Zhao Y, Chen KD, Li S, Lao J, Yuan S, Shyy JY, Chien S. DNA microarray analysis of gene expression in endothelial cells in response to 24-h shear stress. Physiol Genomics 2001; 7:55-63. [PMID: 11595792 DOI: 10.1152/physiolgenomics.2001.7.1.55] [Citation(s) in RCA: 167] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The recently developed DNA microarray technology provides a powerful and efficient tool to rapidly compare the differential expression of a large number of genes. Using the DNA microarray approach, we investigated gene expression profiles in cultured human aortic endothelial cells (HAECs) in response to 24 h of laminar shear stress at 12 dyn/cm(2). This relatively long-term shearing of cultured HAECs led to the modulation of the expression of a number of genes. Several genes related to inflammation and EC proliferation were downregulated, suggesting that 24-h shearing may keep ECs in a relatively noninflammatory and nonproliferative state compared with static cells. Some genes were significantly upregulated by the 24-h shear stress; these includes genes involved in EC survival and angiogenesis (Tie2 and Flk-1) and vascular remodeling (matrix metalloproteinase 1). These results provide information on the profile of gene expression in shear-adapted ECs, which is the case for the native ECs in the straight part of the aorta in vivo.
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Affiliation(s)
- B P Chen
- Department of Bioengineering and the Whitaker Institute of Biomedical Engineering, University of California, San Diego, La Jolla 92093-0427, USA
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