851
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Wang JH, Chen Q, Meijers R, Schmucker D, Liu J, Zhang H. Decoding homophilic recognition specificity of Dscam, a neuronal receptor with thousands isoforms. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308097134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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852
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Hu H, Shi Y, Chen Q, Yang W, Zhou H, Chen L, Tang Y, Zheng Y. Endogenous hydrogen sulfide is involved in regulation of respiration in medullary slice of neonatal rats. Neuroscience 2008; 156:1074-82. [PMID: 18793700 DOI: 10.1016/j.neuroscience.2008.08.025] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2008] [Revised: 07/25/2008] [Accepted: 08/11/2008] [Indexed: 10/21/2022]
Abstract
The purpose of the present study was to verify our assumption that rhythmic respiratory activity may be regulated by endogenous hydrogen sulfide (H(2)S) in the medullary slices of neonatal rats. We found that a moderate concentration of donor of H(2)S, NaHS, mainly induced diphasic respiratory responses indicated by changes of discharge frequency (DF) of hypoglossal rootlets, an initial inhibitory stage followed by a later excitatory one. Cystathionine beta-synthase (CBS) substrate, cysteine (CYS), exerted similar effects. CBS inhibitor, NH(2)OH, could eliminate both inhibitory and excitatory effects in the two stages induced by CYS. K(ATP) channel blocker, glibenclamide (Gl), could eliminate the decrease in DF in the initial stage, but not the increase in the later one. On the other hand, adenyl cyclase (AC) inhibitor, SQ-22536 (SQ) could eliminate the increase in DF in the later stage, but not the decrease in the initial one, of the rootlets caused by NaHS. Co-application of Gl and SQ eliminated both inhibitory and excitatory effect induced by NaHS. The cAMP level was increased in the later stage but not in the initial one by NaHS, and the increase in the cAMP level could be eliminated by SQ. It can be concluded that the endogenous H(2)S could be produced through the CBS-H(2)S pathway and could be involved in the control of the central rhythmic respiration in the in vitro medullary slices of neonatal rats by opening K(ATP) channels and activating AC-cAMP pathway of the neurons.
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853
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Manolescu C, Grinberg M, Field C, Ma S, Shen S, Lee H, Wang Y, Granger A, Chen Q, McCaffrey J, Norwood D, Grinberg N. Studies of the Interactions of Amino Alcohols Using High Performance Liquid Chromatography with Crown Ether Stationary Phases. J LIQ CHROMATOGR R T 2008. [DOI: 10.1080/10826070802279285] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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854
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Demond A, Adriaens P, Towey T, Chang SC, Hong B, Chen Q, Chang CW, Franzblau A, Garabrant D, Gillespie B, Hedgeman E, Knutson K, Lee CY, Lepkowski J, Olson K, Ward B, Zwica L, Luksemburg W, Maier M. Statistical comparison of residential soil concentrations of PCDDs, PCDFs, and PCBs from two communities in Michigan. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2008; 42:5441-5448. [PMID: 18754458 DOI: 10.1021/es702554g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The University of Michigan dioxin exposure study was undertaken to address concerns that the industrial discharge of dioxin-like compounds in the Midland, MI area had resulted in contamination of soils in the Tittabawassee River floodplain and downwind of the incinerator. The study was designed in a rigorously statistical manner comprising soil measurements of 29 polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and polychlorinated biphenyls (PCBs) from 766 residential properties, selected probabilistically, in the Midland area and in Jackson and Calhoun Counties (Michigan) as a background comparison. A statistical comparison determined that the geometric mean toxic equivalent (TEQ) levels in samples from the target populations were statistically significantly above background. In addition, the probabilities of being above the 75th and 95th percentiles of background were also greater. Congener contributions to the TEQ were dominated by 2,3,4,7,8-PeCDF and 2,3,7,8-TCDF in the floodplain and by 2,3,7,8-TCDD in the incinerator plume. However, PCB 126 was the top congener contributing to the background TEQ. On the basis of statistical inference to the total population, it was estimated that about 36% of the properties in the floodplain and incinerator plume have at least one soil sample over the Michigan Department of Environmental Quality's soil direct contact criterion of 90 pg/g TEQ.
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855
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Lu W, Chen M, Chen Q, Mauer C, Ruchala K, Lucas D, Zhang J, Olivera G. WE-E-AUD A-02: Real-Time Motion-Adapted-Optimization (MAO) Guided TomoTherapy Delivery. Med Phys 2008. [DOI: 10.1118/1.2962769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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856
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Hesston R, Gibbons J, Hogstrom K, Chen Q, Chapman T, Olivera G, Ruchala K. WE-D-AUD B-04: Dosimetric Evaluation of a Delivery Verification and Dose Reconstruction Method for Helical Tomotherapy. Med Phys 2008. [DOI: 10.1118/1.2962736] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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857
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Wang FQ, Wang ET, Liu J, Chen Q, Sui XH, Chen WF, Chen WX. Mesorhizobium albiziae sp. nov., a novel bacterium that nodulates Albizia kalkora in a subtropical region of China. Int J Syst Evol Microbiol 2008. [DOI: 10.1099/ijs.0.65976-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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858
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Chen Q, Ryu S, Liu Y, Chetty I, Ouyang I, Wen N, Liu D, Movsas B, Jin J. SU-EE-A2-04: Verification of the Rotational Accuracy of the Brainlab Robotics 6D Couch and the ExacTrac X-Ray 6D Fusion System. Med Phys 2008. [DOI: 10.1118/1.2961383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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859
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Chen Y, Lu W, Chen Q, Reitz G, Ruchala K, Olivera G. SU-GG-T-82: Dynamic Jaw for Helical TomoTherapy Delivery. Med Phys 2008. [DOI: 10.1118/1.2961834] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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860
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Chen Q, Reitz G, Finley S, Westerly D, Koenigs C, Ruchala K, Olivera G. SU-GG-T-136: Real Time Delivery Verification Using Exit Detector Data. Med Phys 2008. [DOI: 10.1118/1.2961888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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861
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Chen Q, Blair H, Ciezki J, Mahadevan A, Began N, Suh J. SU-GG-T-06: Investigation to Replace CT by MRI in Post-Implant Dosimetry of Prostate Permanent Brachytherapy. Med Phys 2008. [DOI: 10.1118/1.2961756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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862
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Liu Y, Strumban E, Jiang Q, Zhao J, Chen Q, Sozontov E, Gutman G, Guan H, Li S. TU-C-AUD B-05: Desired Dose Distributions From Newly-Designed Low-Energy Needle-Based X-Ray Sources. Med Phys 2008. [DOI: 10.1118/1.2962441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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863
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Ouyang I, Wen N, Chen Q, Babij D, Aref I, Ajlouni M, Movsas B, Chetty IJ. WE-E-AUD C-06: 4D Imaging of Lung Cancer Patients Treated with Stereotactic Body Radiotherapy (SBRT): Assessment of Target Volumes. Med Phys 2008. [DOI: 10.1118/1.2962787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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864
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Mahadevan A, Khan M, Chen Q. SU-GG-T-373: Real-Time Tracking of Inter Marker Distances to Assess Maker Stability, Organ Deformation in Prostate Cancer. Med Phys 2008. [DOI: 10.1118/1.2962125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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865
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Westerly D, Soisson E, Chen Q, Woch K, Schubert L, Olivera G, Mackie T. TU-FF-A1-05: Treatment Planning to Reduce the Impact of Delivery Errors in Helical Tomotherapy. Med Phys 2008. [DOI: 10.1118/1.2962642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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866
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Lu W, Chen M, Chen Q, Ruchala K, Olivera G. SU-GG-T-58: Adaptive Fractionation Therapy- I. Basic Concept and Strategy. Med Phys 2008. [DOI: 10.1118/1.2961809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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867
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Chen M, Lu W, Chen Q, Ruchala K, Olivera G. SU-GG-T-59: Adaptive Fractionation Therapy - II Biological Effective Dose. Med Phys 2008. [DOI: 10.1118/1.2961810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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868
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Lin R, Fan N, Chen Q, Guo Z, Wang X, Chen L, Liu J. Phase II study of 5-florouracil/leucovorin in combination with paclitaxel and oxaliplatin in 1st line treatment for patients with advanced gastric cancer (AGC). J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.15678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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869
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Fominaya A, Molnar S, Fedak G, Armstrong KC, Kim NS, Chen Q. Characterization of Thinopyrum distichum chromosomes using double fluorescence in situ hybridization, RFLP analysis of 5S and 26S rRNA, and C-banding of parents and addition lines. Genome 2008; 40:689-96. [PMID: 18464858 DOI: 10.1139/g97-791] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Diagnostic markers for eight Thinopyrum distichum addition chromosomes in Triticum turgidum were established using C-banding, in situ hybridization, and restriction fragment length polymorphism analysis. The C-band karyotype conclusively identified individual Th. distichum chromosomes and distinguished them from chromosomes of T. turgidum. Also, TaqI and BamHI restriction fragments containing 5S and 18S-5.8S-26S rRNA sequences were identified as positive markers specific to Th. distichum chromosomes. Simultaneous fluorescence in situ hybridization showed both 5S and 18S-5.8S-26S ribosomal RNA genes to be located on chromosome IV. Thinopyrum distichum chromosome VII carried only a 18S-5.8S-26S rRNA locus and chromosome pair II carried only a 5S rRNA locus. The arrangement of these loci on Th. distichum chromosome IV was different from that on wheat chromosome pair 1B. Two other unidentified Th. distichum chromosome pairs also carried 5S rRNA loci. The homoeologous relationship between Th. distichum chromosomes IV and VII and chromosomes of other members of the Triticeae was discussed by comparing results obtained using these physical and molecular markers.
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870
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Chen Q, Tung EC, Ciccotto SL, Strauss JR, Ortiga R, Ramsay KA, Tang W. Effect of the anticoagulant ethylenediamine tetra-acetic acid (EDTA) on the estimation of pharmacokinetic parameters: A case study with tigecycline and ciprofloxacin. Xenobiotica 2008; 38:76-86. [PMID: 17963190 DOI: 10.1080/00498250701678955] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Tigecycline and ciprofloxacin were employed as the model compounds to study the effect of the anticoagulant ethylenediamine tetra-acetic acid (EDTA), which is used during plasma sample preparations, on the determination of pharmacokinetic parameters. The pharmacokinetic parameters were determined in rats following intravenous infusion with blood samples collected in serum separators, with either EDTA- or heparin-coated tubes. The blood-to-plasma (B:P) partition ratio and plasma protein binding were determined in vitro in rat or human blood collected in either EDTA- or heparin-coated tubes. Drug concentrations were quantified by liquid chromatography coupled with tandem mass spectrometry detection (LC-MS/MS) analysis. In tigecycline-treated rats drug concentrations were twofold lower in EDTA plasma, leading to a twofold lower area under plasma concentration-time curve (AUC) and twofold higher plasma clearance values as compared with those obtained from heparin plasma. No differences were noted in the pharmacokinetic parameters obtained from heparin-treated plasma versus serum. The B:P partition ratio and unbound fraction for tigecycline were significantly higher in EDTA-treated blood. When normalized to the B:P partition ratios, the tigecycline blood clearance values were identical between samples collected in EDTA- or heparin-coated tubes. Similar but smaller differences were observed for ciprofloxacin. It was concluded that EDTA might compete with tigecycline and ciprofloxacin for chelating metal ions and thus affect drug partition between blood and plasma compartments, leading to inaccurate measurement of pharmacokinetic parameters in plasma.
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871
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Chen Q, Yan CQ, Liu FJ, Tong J, Miao SL, Chen JP. Overexpression of the PDCD2-like gene results in Inhibited TNF-α production in activated Daudi cells. Hum Immunol 2008; 69:259-65. [DOI: 10.1016/j.humimm.2008.01.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2007] [Revised: 01/03/2008] [Accepted: 01/09/2008] [Indexed: 11/25/2022]
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872
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AJUEBOR MAUREEN, Jin Y, Gremillion G, Chen Q, Adegboyega P. IFN‐γ‐producing γδT Cells Promote Liver Injury in Virus Infected Liver. FASEB J 2008. [DOI: 10.1096/fasebj.22.1_supplement.1190.1] [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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873
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Tang Y, Lu J, Cao L, Wu M, Peng S, Zhou H, Huang C, Yang Y, Zhou Y, Chen Q, Li X, Zhou M, Li G. Genetic variations of EBV-LMP1 from nasopharyngeal carcinoma biopsies: potential loss of T cell epitopes. Braz J Med Biol Res 2008; 41:110-6. [DOI: 10.1590/s0100-879x2008000200006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2007] [Accepted: 12/18/2007] [Indexed: 11/21/2022] Open
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874
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Chen Q, Viall C, Stone PR, Chamley LW. 432. How do antiphospholipid antibodies contribute to preeclampsia? Reprod Fertil Dev 2008. [DOI: 10.1071/srb08abs432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Preeclampsia is characterised by elevated maternal blood pressure which is preceded by endothelial activation. The cause of this endothelial cell dysfunction is unclear but it appears to be triggered by a placental factor. One of the risk factors for developing preeclampsia is the presence of antiphospholipid antibodies (aPL) in the maternal blood but exactly how aPL predispose women to developing preeclampsia is unclear. A second feature known to be associated with preeclampsia is excessive shedding and deportation of dead trophoblasts. We have previously shown that shed trophoblasts are phagocytosed by endothelial cells and that phagocytosis of necrotic trophoblasts leads to endothelial cell activation1. In this study we examined the hypothesis that aPL alter the number or nature of trophoblasts shed from the placenta resulting in endothelial cell activation. Using our published model of trophoblast shedding 2 human first trimester placental explants were treated with monoclonal aPL, IIC5 or ID2, or control antibody CD45 for 72 h. Shed trophoblasts then were harvested and counted using a Cellometer AutoT4 automated cell counter. The activity of caspases 3&7 was analysed in all treated shed trophoblasts using a FLICA™ kit. The treated shed trophoblasts also were exposed to the endothelial cell line HMEC-1 for 24 h. The level of ICAM-1 by HMEC-1 was determined by cell-based ELISA. The number of trophoblasts shed from placental explants was increased 2 fold following aPL treatment whereas, treatment with CD45 resulted in only a 1.3 fold increase in shedding. Trophoblasts shed from aPL-treated explants contained less active caspases 3 & 7 compared with control shed trophoblasts. Moreover, phagocytosis of trophoblasts shed from aPL-treated explants induced significantly increased expression of ICAM-1 compared with controls. aPL treatment affected the number and nature of trophoblasts shed from placentae in such a way that phagocytosing endothelium become activated. These findings suggest that aPL treatment may have shifted the type of cell death that shed trophoblasts are undergoing from apoptosis to a more necrotic or aponecrotic mechanism. This type of shedding of trophoblasts in vivo might contribute to the endothelial cell activation which is a hallmark feature of preeclampsia.
(1) Chen Q, Stone PR, McCowan LM et al. Phagocytosis of necrotic but not apoptotic trophoblasts induces endothelial cell activation. Hypertension. 2006;47:116–121.
(2) Abumaree MH, Stone PR, Chamley LW. An in vitro model of human placental trophoblast deportation/shedding. Mol Hum Reprod. 2006;12:687–694.
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875
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Chen Q, Yang Y, Qiu H, Liu S. Pulmonary homogenicity changes during recruitment maneuvers and positive end-expiratory pressure in dogs with acute respiratory distress syndrome. Crit Care 2008. [PMCID: PMC4088669 DOI: 10.1186/cc6519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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