676
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Rodenburg C, Liu X, Jepson MAE, Zhou Z, Rainforth WM, Rodenburg JM. The role of helium ion microscopy in the characterisation of complex three-dimensional nanostructures. Ultramicroscopy 2010; 110:1178-84. [PMID: 20452124 DOI: 10.1016/j.ultramic.2010.04.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2010] [Revised: 04/04/2010] [Accepted: 04/20/2010] [Indexed: 10/19/2022]
Abstract
This work addresses two major issues relating to Helium Ion Microscopy (HeIM). First we show that HeIM is capable of solving the interpretation difficulties that arise when complex three-dimensional structures are imaged using traditional high lateral resolution techniques which are transmission based, such as scanning transmission electron microscopy (STEM). Secondly we use a nano-composite coating consisting of amorphous carbon embedded in chromium rich matrix to estimate the mean escape depth for amorphous carbon for secondary electrons generated by helium ion impact as a measure of HeIM depth resolution.
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677
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Zhou Z, Wan H, Li Y, Chen W, Qi Z, Peng P, Peng J. The influence of the amylopectin/amylose ratio in samples of corn on the true metabolizable energy value for ducks. Anim Feed Sci Technol 2010. [DOI: 10.1016/j.anifeedsci.2010.02.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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678
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Zhou Z, Bernard MR, Bonds AB. Synchrony modulation in cat visual cortex reflects structure from coherent motion of random dots. J Vis 2010. [DOI: 10.1167/6.6.68] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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679
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Jermakowicz W, Marion R, Khaytin I, Zhou Z, Bernard M, Bonds A, Casagrande V. Inactivation of area MT has separate influences on the spiking of single neurons and neuron populations in primate V1. J Vis 2010. [DOI: 10.1167/9.8.671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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680
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Bernard MR, Zhou Z, Bonds AB. Synchronous activity in cat visual cortex detects structural modifications in natural images. J Vis 2010. [DOI: 10.1167/6.6.67] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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681
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Jermakowicz WJ, Chen X, Khaytin I, Zhou Z, Bernard M, Bonds AB, Casagrande VA. Does spike synchrony provide a better code of stimulus angle than average firing rate? J Vis 2010. [DOI: 10.1167/6.6.66] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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682
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Bernard M, Zhou Z, Bonds AB. A Synchrony-based sparse code in Cat visual cortex signals complex contours in natural images. J Vis 2010. [DOI: 10.1167/7.9.389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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683
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Zhou Z, Bernard MR, Bonds AB. Temporal and frequency analysis of synchronized neural responses in Cat visual cortex. J Vis 2010. [DOI: 10.1167/7.9.390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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684
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Jermakowicz W, Chen X, Khaytin I, Madison C, Zhou Z, Bernard M, Bonds AB, Casagrande V. Is Synchrony a reasonable coding strategy for visual areas beyond V1 in primates? J Vis 2010. [DOI: 10.1167/7.9.325] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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685
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Bernard MR, Samonds JM, Zhou Z, Bonds AB. An integration model for detection and quantification of synchronous firing within cell groups. J Vis 2010. [DOI: 10.1167/5.8.676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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686
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Zhou Z, Li X, Deng C, Ney PA, Huang S, Bungert J. USF and NF-E2 cooperate to regulate the recruitment and activity of RNA polymerase II in the beta-globin gene locus. J Biol Chem 2010; 285:15894-905. [PMID: 20236933 DOI: 10.1074/jbc.m109.098376] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The human beta-globin gene is expressed at high levels in erythroid cells and regulated by proximal and distal cis-acting DNA elements, including promoter, enhancer, and a locus control region (LCR). Transcription complexes are recruited not only to the globin gene promoters but also to the LCR. Previous studies have implicated the ubiquitously expressed transcription factor USF and the tissue-restricted activator NF-E2 in the recruitment of transcription complexes to the beta-globin gene locus. Here we demonstrate that although USF is required for the efficient association of RNA polymerase II (Pol II) with immobilized LCR templates, USF and NF-E2 together regulate the association of Pol II with the adult beta-globin gene promoter. Recruitment of Pol II to the LCR occurs in undifferentiated murine erythroleukemia cells, but phosphorylation of LCR-associated Pol II at serine 5 of the C-terminal domain is mediated by erythroid differentiation and requires the activity of NF-E2. Furthermore, we provide evidence showing that USF interacts with NF-E2 in erythroid cells. The data provide mechanistic insight into how ubiquitous and tissue-restricted transcription factors cooperate to regulate the recruitment and activity of transcription complexes in a tissue-specific chromatin domain.
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687
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Zhou Z, Samonds JM, Bernard MR, Bonds AB. Synchronous activity in cat visual cortex encodes collinear and cocircular contours. J Vis 2010. [DOI: 10.1167/5.8.675] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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688
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Scamans GM, Frolish MF, Rainforth WM, Zhou Z, Liu Y, Zhou X, Thompson GE. The ubiquitous Beilby layer on aluminium surfaces. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3204] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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689
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Guo X, Zhao C, Wang F, Zhu Y, Cui Y, Zhou Z, Huo R, Sha J. Investigation of Human Testis Protein Heterogeneity Using 2-Dimensional Electrophoresis. ACTA ACUST UNITED AC 2010; 31:419-29. [DOI: 10.2164/jandrol.109.007534] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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690
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Dellinger A, Brooks B, Zhou Z, Lenk R, MacFarland D, Kepley C. Fullerene Structure Regulates FcεRI-Calcium Flux in Human Mast Cells. J Allergy Clin Immunol 2010. [DOI: 10.1016/j.jaci.2009.12.714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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691
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Norton S, Dellinger A, Lenk R, Zhou Z, Conrad D, Kepley C. Fullerene C70 Derivatives Inhibit Mast Cell Mediated Airway Inflammation and Eosinophilia Associated with Chronic Asthma. J Allergy Clin Immunol 2010. [DOI: 10.1016/j.jaci.2009.12.734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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692
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Brooks B, Norton S, Dellinger A, Zhou Z, Lenk R, MacFarland D, Conrad D, Kepley C. Effects of Novel Nanomaterials on Allergic Mediator Release from Human Mast Cells through Non-IgE Mediated Pathways. J Allergy Clin Immunol 2010. [DOI: 10.1016/j.jaci.2009.12.708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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693
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Zhou Z, Xu G, Liu X. Endovascular Solutions for Ischaemic Cerebrovascular Diseases: Report of the Fifth International Stroke Summit. Int J Stroke 2010. [DOI: 10.1111/j.1747-4949.2009.00403.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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694
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Zhang Y, Cui Y, Zhou Z, Sha J, Li Y, Liu J. Altered global gene expressions of human placentae subjected to assisted reproductive technology treatments. Placenta 2010; 31:251-8. [PMID: 20116094 DOI: 10.1016/j.placenta.2010.01.005] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2009] [Revised: 12/16/2009] [Accepted: 01/05/2010] [Indexed: 10/19/2022]
Abstract
BACKGROUND Researchers are more and more concerning the safety of fetus or offspring derived from assisted reproductive technology (ART) treatment. As the placenta is a critical organ that sustains and protects the fetus, we hypothesize that altered global gene expression of the placenta subjected to ART manipulation may reflect changes associated with ART procedures and subsequently causal related to offspring health. METHODS Three term placenta samples were obtained from patients undergone in vitro fertilization and embryo transfer due to oviductal factors only. Other three control placentae were from those underwent normal pregnancy. A GeneChip Affymetrix HG-U133 Plus 2.0 Array was utilized to analyze the genes. Using qRT-PCR we certified microarray data from 10 dysregulated genes. Five genes were localized precisely in the placenta as per immunohistochemistry. RESULTS Twenty-six differentially expressed genes were identified in the ART-treated placentae: 17 up-regulated; 9 down-regulated. Eighteen of these were classified into six groups according to critical placental function: immune response; transmembrane transport; metabolism; oxidative stress; cell differentiation; and other functions. Genes involved in immune response, such as ERAP2 and STAT4, and those regulating cell differentiations, such as MUC1, were discerned to be differentially expressed. These gene products were expressed in the placental villus tissues, either in the cytoplasm or in the membrane of syncytiotrophoblastic cells. CONCLUSION To our knowledge, this is the first study in comparing differentially expressed genes in placentae from patients undergone ART treatment vs. those underwent normal pregnancy. Abnormal profiles of critical placental functioning genes, such as ERAP2, STAT4 and MUC1, may be valuable biomarkers to understand how the placenta affects fetal development and ART-derived offspring's health problems.
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695
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Yang Y, Keum J, Zhou Z, Thompson G, Hiltner A, Baer E. Structure and properties of biaxial-oriented crystalline polymers by solid-state crossrolling. J Appl Polym Sci 2010. [DOI: 10.1002/app.32414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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696
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He P, Zhou Z, Wang Z, Zhou J, Cen K. Visualization of circular subsonic jet flow by DNS. J Vis (Tokyo) 2009. [DOI: 10.1007/bf03181869] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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697
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McClure SM, Lundwall M, Yang F, Zhou Z, Goodman DW. Characterization of active sites on Rh/SiO(2) model catalysts. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:474223. [PMID: 21832502 DOI: 10.1088/0953-8984/21/47/474223] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Rh/SiO(2) model catalyst surfaces are prepared under ultra-high vacuum conditions and examined in situ using scanning tunneling microscope and CO infrared reflection absorption techniques, to quantify the number and kinds of active Rh surface sites available for kinetic reaction (CO oxidation) as a function of Rh particle size. The results are compared against CO desorption measurements and elevated pressure CO oxidation reaction kinetics, to evaluate the extent of the correlation between the low and elevated pressure site characterization techniques. Data demonstrate that estimates of Rh active sites exhibit good agreement between the characterization methods and illustrate the utility of low pressure surface science characterization techniques in understanding elevated pressure reaction kinetics on model catalyst surfaces.
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698
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Li D, Zhou Z, Qing D, He Y, Wu T, Miao M, Wang J, Weng X, Ferber J, Herrinton L, Zhu Q, Gao E, Checkoway H, Yuan W. Occupational exposure to bisphenol-A (BPA) and the risk of Self-Reported Male Sexual Dysfunction. Hum Reprod 2009; 25:519-27. [DOI: 10.1093/humrep/dep381] [Citation(s) in RCA: 204] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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699
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Zhu W, Dang Z, Qiu J, Liu Y, Lv C, Diao J, Zhou Z. Species differences for stereoselective metabolism of ethofumesate and its enantiomers in vitro. Xenobiotica 2009; 39:649-55. [PMID: 19552529 DOI: 10.1080/00498250902974211] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
1. The stereoselective metabolism of ethofumesate (ETO) and its enantiomers in rabbit and rat liver microsomes have been studied by chiral high-performance liquid chromatography (HPLC) method. Two metabolites were detected in both liver microsomes in the presence of beta-nicotinamide adenine dinucleotide phosphate (NADPH). 2. The T(1/2) of (+)-ETO and (-)-ETO in rabbit liver microsomes were 12.2 and 4.7 min of rac-ETO and 25.9 and 6.7 of ETO enantiomers. However, the T(1/2) of (+)-ETO and (-)-ETO in rat liver microsomes were 5.3 and 5.9 min of rac-ETO and 7.8 and 10.6 of ETO enantiomers. The stereoselective selectivity is similar to the in vivo study. 3. After incubation of ETO enantiomers, stereoselectivity was present in the formation of ETO-OH enantiomer in rabbit liver microsomes, but stereoselectivity was not evident in rat liver microsomes. 4. There was no chiral inversion from the (+)-ETO to (-)-ETO or inversion from (-)-ETO to (+)-ETO in both rabbit and rat liver microsomes.
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700
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Zhou Z, Shen T, Zhang BH, Lv XY, Lin HY, Zhu C, Xue LQ, Wang H. The proprotein convertase furin in human trophoblast: Possible role in promoting trophoblast cell migration and invasion. Placenta 2009; 30:929-38. [PMID: 19853298 DOI: 10.1016/j.placenta.2009.09.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2009] [Revised: 09/09/2009] [Accepted: 09/11/2009] [Indexed: 12/18/2022]
Abstract
Furin, a proprotein convertase (PC), is ubiquitously expressed and implicated in many physiological and pathological processes. This study is aimed to identify the role of furin in human trophoblast invasion and migration. Furin was found to be highly expressed in placental villi of both rhesus monkeys and human beings during early pregnancy. Specifically, furin was found in trophoblast column and trophoblast shell, regions where highly invasive cytotrophoblast cells invade the maternal decidua during human placentation. To determine whether furin plays any role in trophoblast invasion and migration, we employed human extravillous HTR8/SVneo cells in Matrigel invasion and transwell migration assays. Knocking-down furin expression by siRNA significantly inhibited invasion and migration of HTR8/SVneo cells (P<0.01), with corresponding decrease of matrix metalloproteinase-9 (MMP-9) activities. In contrast, over-expression of furin markedly increased cell invasion and migration (P<0.01), accompanied by significant increase of MMP-9 activities. Furthermore, furin siRNA significantly increased the levels of both tissue inhibitors of MMPs (TIMP)-1 and -2. Our results suggest that furin may play an important role in the invasion and migration of human trophoblast cells during early pregnancy.
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