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Ding M, Zollinger W, Heard D, Ebeling R. Noncoplanar RapidArc for Stereotactic Radiotherapy (SBRT) for Peripheral Lung Tumors. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.1541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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102
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Ding M, Wang B, Wang Z, Zhang J, Fuhr O, Fenske D, Gao S. Solvent-tuned magnetic behaviors of manganese(III) corroles. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311083838] [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] Open
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103
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Ding M, Heard D, Ma C. SU-E-J-66: Improvement in SRS Commission and Patient-Specific Quality Assurance. Med Phys 2011. [DOI: 10.1118/1.3611834] [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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104
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Pacurari M, Qian Y, Porter DW, Wolfarth M, Wan Y, Luo D, Ding M, Castranova V, Guo NL. Multi-walled carbon nanotube-induced gene expression in the mouse lung: association with lung pathology. Toxicol Appl Pharmacol 2011; 255:18-31. [PMID: 21624382 DOI: 10.1016/j.taap.2011.05.012] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2011] [Revised: 05/10/2011] [Accepted: 05/12/2011] [Indexed: 10/18/2022]
Abstract
Due to the fibrous shape and durability of multi-walled carbon nanotubes (MWCNT), concerns regarding their potential for producing environmental and human health risks, including carcinogenesis, have been raised. This study sought to investigate how previously identified lung cancer prognostic biomarkers and the related cancer signaling pathways are affected in the mouse lung following pharyngeal aspiration of well-dispersed MWCNT. A total of 63 identified lung cancer prognostic biomarker genes and major signaling biomarker genes were analyzed in mouse lungs (n=80) exposed to 0, 10, 20, 40, or 80μg of MWCNT by pharyngeal aspiration at 7 and 56days post-exposure using quantitative PCR assays. At 7 and 56days post-exposure, a set of 7 genes and a set of 11 genes, respectively, showed differential expression in the lungs of mice exposed to MWCNT vs. the control group. Additionally, these significant genes could separate the control group from the treated group over the time series in a hierarchical gene clustering analysis. Furthermore, 4 genes from these two sets of significant genes, coiled-coil domain containing-99 (Ccdc99), muscle segment homeobox gene-2 (Msx2), nitric oxide synthase-2 (Nos2), and wingless-type inhibitory factor-1 (Wif1), showed significant mRNA expression perturbations at both time points. It was also found that the expression changes of these 4 overlapping genes at 7days post-exposure were attenuated at 56days post-exposure. Ingenuity Pathway Analysis (IPA) found that several carcinogenic-related signaling pathways and carcinogenesis itself were associated with both the 7 and 11 gene signatures. Taken together, this study identifies that MWCNT exposure affects a subset of lung cancer biomarkers in mouse lungs.
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Henriksen SS, Ding M, Juhl MV, Theilgaard N, Overgaard S. Mechanical strength of ceramic scaffolds reinforced with biopolymers is comparable to that of human bone. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2011; 22:1111-1118. [PMID: 21431906 DOI: 10.1007/s10856-011-4290-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Accepted: 03/10/2011] [Indexed: 05/30/2023]
Abstract
Eight groups of calcium-phosphate scaffolds for bone implantation were prepared of which seven were reinforced with biopolymers, poly lactic acid (PLA) or hyaluronic acid in different concentrations in order to increase the mechanical strength, without significantly impairing the microarchitecture. Controls were un-reinforced calcium-phosphate scaffolds. Microarchitectural properties were quantified using micro-CT scanning. Mechanical properties were evaluated by destructive compression testing. Results showed that adding 10 or 15% PLA to the scaffold significantly increased the mechanical strength. The increase in mechanical strength was seen as a result of increased scaffold thickness and changes to plate-like structure. However, the porosity was significantly lowered as a consequence of adding 15% PLA, whereas adding 10% PLA had no significant effect on porosity. Hyaluronic acid had no significant effect on mechanical strength. The novel composite scaffold is comparable to that of human bone which may be suitable for transplantation in specific weight-bearing situations, such as long bone repair.
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Werkheiser JL, Sydserff S, Hubbs SJ, Ding M, Eisman MS, Perry D, Williams AJ, Smith JS, Mrzljak L, Maier DL. Ultra-low exposure to α-7 nicotinic acetylcholine receptor partial agonists elicits an improvement in cognition that corresponds with an increase in α-7 receptor expression in rodents: implications for low dose clinical efficacy. Neuroscience 2011; 186:76-87. [PMID: 21550383 DOI: 10.1016/j.neuroscience.2011.04.033] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2011] [Revised: 04/11/2011] [Accepted: 04/12/2011] [Indexed: 11/16/2022]
Abstract
Αlpha-7 neuronal nicotinic receptors (NNRs) are considered targets for cognitive enhancement in schizophrenia and Alzheimer's disease. AZD0328 is an alpha-7 NNR partial agonist that enhances cognition in rodents and nonhuman primates at sub-microgram to microgram doses. We hypothesized that increased expression of the alpha-7 receptor contributes to this beneficial activity at low doses and tested this by examining the effect of AZD0328 using in vivo and ex vivo binding, RT-PCR and cognitive function in rodents. AZD0328 (0.00178 mg/kg) was subcutaneously administered to mice 4, 24, 48 and 72 hours prior to testing in novel object recognition and produced a significant increase in cognition at 4, 24 and 48 h post-dosing. In vivo binding was examined in rat brain using [(3)H]AZ11637326 and there was a dose-dependent reduction in receptor binding at higher doses of AZD0328 (0.001-3 mg/kg), and a second alpha-7 partial agonist, SSR180711 (0.01-30 mg/kg). Lower doses of both compounds (0.0001 mg/kg) produced a significant increase in binding of [(3)H]AZ11637326. Ex vivo binding using [(125)I]-α-bungarotoxin, showed a significant increase in receptor number (B(max.)) in the frontal cortex or hippocampus with no significant effect on receptor affinity (K(d)) 2 h post administration of AZD0328. [(3)H]AZ11637326 administered 1.5 h following AZD0328 produced a significant increase in specific binding in rat brain regions. We found that the effect on receptor number was long-lasting, with [(125)I]-α-bungarotoxin binding increased in rats given AZD0328 for 2-48 h, but this was not accompanied by increased mRNA synthesis. SSR180711 produced a similar increase in B(max.) and specific binding with no effect on K(d). Therefore, trace dose of alpha-7 partial agonists has rapid onset and produces a profound, sustained effect on novel object recognition in mice that corresponds by dose to an increase in receptor number in rat brain. These findings provide an explanation for the acute and sustained benefit of alpha-7 receptor activation in working memory in nonhuman primates and guidance for drug development initiatives and treatment regimens for nicotinic partial agonists.
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Anderson KL, Ding M. Attentional modulation of the somatosensory mu rhythm. Neuroscience 2011; 180:165-80. [PMID: 21310216 DOI: 10.1016/j.neuroscience.2011.02.004] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Revised: 01/31/2011] [Accepted: 02/01/2011] [Indexed: 01/13/2023]
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Cao X, Yang M, Wei RC, Zeng Y, Gu JF, Huang WD, Yang DQ, Li HL, Ding M, Wei N, Zhang KJ, Xu B, Liu XR, Qian QJ, Liu XY. Cancer targeting Gene-Viro-Therapy of liver carcinoma by dual-regulated oncolytic adenovirus armed with TRAIL gene. Gene Ther 2011; 18:765-77. [PMID: 21412282 DOI: 10.1038/gt.2011.16] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Liver cancer is a common and aggressive malignancy, but available treatment approaches remain suboptimal. Cancer targeting Gene-Viro-Therapy (CTGVT) has shown excellent anti-tumor effects in a preclinical study. CTGVT takes advantage of both gene therapy and virotherapy by incorporating an anti-tumor gene into an oncolytic virus vector. Potent anti-tumor activity is achieved by virus replication and exogenous expression of the anti-tumor gene. A dual-regulated oncolytic adenoviral vector designated Ad·AFP·E1A·E1B (Δ55) (Ad·AFP·D55 for short thereafter) was constructed by replacing the native viral E1A promoter with the simian virus 40 enhancer/α-fetoprotein (AFP) composite promoter (AFPep) based on an E1B-55K-deleted construct, ZD55. Ad·AFP·D55 showed specific replication and cytotoxicity in AFP-positive hepatoma cells. It also showed enhanced safety in normal cells when compared with the mono-regulated vector ZD55. To improve the anti-hepatoma activities of the virus, the tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) gene was introduced into Ad·AFP·D55. Ad·AFP·D55-TRAIL exhibited remarkable anti-tumor activities in vitro and in vivo. Treatment with Ad·AFP·D55-TRAIL can induce both autophagy owing to the Ad·AFP·D55 vector and caspase-dependent apoptosis owing to the TRAIL protein. Therefore, Ad·AFP·D55-TRAIL could be a potential anti-hepatoma agent with anti-tumor activities due to AFP-specific replication and TRAIL-induced apoptosis.
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Ding M, Yin Y, Fang Q, Li S, Zhang Z. First Report of Impatiens necrotic spot virus in Gentiana macrophylla in China. PLANT DISEASE 2011; 95:357. [PMID: 30743508 DOI: 10.1094/pdis-09-10-0685] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Large leaf gentian, Gentiana macrophylla Pall., known as Qin Jiao in Chinese, is a medicinal herb. Its root is most commonly used in Chinese traditional medicine to relieve rheumatic conditions and to remove damp-heat. During a survey in July 2009, large leaf gentian plants exhibiting foliar chlorotic and necrotic spots as well as severe stunting were collected in Lijiang County, Yunnan Province of China. Incidence of symptomatic plants ranged from 10 to 30% in the field. Symptomatic leaves from five different G. macrophylla plants were collected and tested for Impatiens necrotic spot virus (INSV), Tomato spotted wilt virus, Watermelon silver mottle virus, Groundnut bud necrosis virus, Tomato chlorotic spot virus, and Groundnut ringspot virus by double-antibody sandwich-ELISA kits (Agdia Inc., Elkhart, IN). All tested samples were positive only for INSV. To further confirm the presence of INSV, reverse transcription (RT)-PCR was conducted. Total RNA was extracted from the symptomatic large leaf gentian plants leaves with a RNeasy Plant Kit (Qiagen Inc., Valencia, CA) and used as a template in RT-PCR using forward (5'-CTT TGC TTT TTA GAA CTG TGC A-3') and reverse (5'-AGA GCA ATT GTG TCA CGA ATA T-3') primers specific to the partial INSV nucleoprotein (N) gene (GenBank No. DQ425096). Amplicons of the expected size (approximately 760 bp) were obtained from all ELISA-positive samples. Three clones were sequenced and the partial nucleocapsid protein genes consensus sequences of these isolates were determined (GenBank No. HQ317133). Nucleotide sequences of large leaf gentian isolates shared 98 to 99% nucleotide identity with INSV sequences of isolates from China, Italy, Japan, United States, and the Netherlands (GenBank Nos. FN400772, GQ336989, DQ425096, AB109100, D00914, AB109100, and X66972). INSV is one of the most serious viral pathogens of ornamental plants in North America, Europe, and Asia (1-3). To our knowledge, this is the first report of natural occurrence of INSV in G. macrophylla in China. References: (1) S. T. Koike. Plant Dis. 92:1248, 2008. (2) E. K. Tóth et al. Plant Dis. 91:331, 2007. (3) Q. Zhang et al. Plant Dis. 94:915, 2010.
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Ding M, Yang C, Zhang L, Jiang ZL, Fang Q, Qin XY, Zhang ZK. Occurrence of Chilli veinal mottle virus in Nicotiana tabacum in Yunnan, China. PLANT DISEASE 2011; 95:357. [PMID: 30743520 DOI: 10.1094/pdis-09-10-0686] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Flue-cured tobacco (Nicotiana tabacum) is an important crop in Yunnan Province, China. During a survey in July 2010, tobacco plants (N. tabacum cv. Yunyan 85) in the fields near Dali County in the northwest Yunnan Province of China had symptoms of chlorosis along leaf veins and later showed symptoms of white or brown necrosis along the veins. In 10 surveyed fields in Baizhishu Village in the city of Weishan, a commercial tobacco field (10 ha) developed virus-like disease symptoms; the incidence of affected plants ranged from 0.5 to 3%, which caused obvious economic losses. An isolate (YN75) was collected at random from five symptomatic leaves sampled from five plants. Negative staining of crude extracts of the infected leaves and subsequent electron microscopy revealed flexuous rods of 12 to 13 × 750 nm. Pinwheel-like inclusion bodies were abundant in thin sections of infected leaves. The particle size suggested a species of Potyviridae. Thus, the isolate was assayed in double antibody sandwich-ELISA (Agdia, Elkhart, IN) for the presence of Potato virus Y, Tobacco etch virus, and Tobacco vein mottling virus. All antigens gave negative results. Total RNA was extracted from leaves and tested by reverse transcription (RT)-PCR. The primer M4-T (5'-GTT TTC CCA GTC ACG ACT TTT TTT TTT TTT TT-3') was employed for cDNA synthesis described by Chen et al (1). The primer set ChiVMV-F (5'-TAG TTG YGC ATA C (C/G) C AGG AGA GAG-3')/M4 (5'-GTT TTC CCA GTC ACG AC-3') is complimentary to the region of coat protein and 3'-untranslated region of Chilli veinal mottle virus (ChiVMV), respectively. The expected 1,189-bp fragments were amplified from RNA templates and the amplicon was cloned and sequenced (GenBank Accession No. HQ218936). Comparisons of amplicons with the amino acid sequence available in the NCBI database using BLAST showed 91.4% identity with ChiVMV from India (GenBank Accession No. EF213688) and 90.7% with ChiVMV from Taiwan (Accession No. DQ854950). The virus particle size, RT-PCR results, and sequence data revealed that these tobacco plants were infected by ChiVMV. To our knowledge, this is the first report of ChiVMV infecting N. tabacum in China. Reference: (1) J. Chen et al. Arch. Virol. 146:757, 2001.
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Ren F, Chen Y, Wang Y, Yan Y, Zhao J, Ding M, Zhang J, Jiang Y, Zhai Y, Duan Z. Comparative serum proteomic analysis of patients with acute-on-chronic liver failure: alpha-1-acid glycoprotein maybe a candidate marker for prognosis of hepatitis B virus infection. J Viral Hepat 2010; 17:816-24. [PMID: 20002297 DOI: 10.1111/j.1365-2893.2009.01242.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The acute-on-chronic liver failure (AoCLF) caused by hepatitis B virus (HBV) infection remains to be a challenge in clinics with a high mortality rate in China, and it is important to identify biomarkers to foresee the prognosis of patients with HBV. The current study analysed serum proteome changes of acute-on-chronic liver failure as a result of acute exacerbation of chronic hepatitis B infection. Serum samples were collected from normal subjects (NS, n = 8), patients with chronic hepatitis B (CHB, n = 12) and patients with AoCLF (n = 12). After removal of albumin/IgG and ultramembrane centrifugation, serum proteins were separated by two-dimensional gel electrophoresis. Differentially expressed spots were identified by matrix-associated laser desorption ionization time-of-flight tandem mass spectrometry. Through the removal of albumin/IgG and ultramembrane centrifugation, the well-resolved and reproducible two-dimensional gel electrophoresis (2-DE) profiles were obtained. A total of 23 proteins were identified on 2-DE profiles by their differential expression between the three cohorts. Mass spectrometry analysis resulted in the identification of 12 proteins unambiguously. Western blot analysis confirmed the proteomics results that the α1-acid glycoprotein (α1-AGP) levels decrease significantly in plasma of patients with AoCLF, but somewhat decreased in patients with chronic HBV. Further α1-AGP levels in bulk serum samples were measured by immune turbidimetry including normal subjects group (n = 25), acute hepatitis group (n = 36), chronic hepatitis group (n = 52) and AoCLF group (n = 48), the level of α1-AGP in AoCLF groups sharply decrease than other groups. Our study shows that α1-AGP may be a potential plasma biomarker for AoCLF diagnosis because of acute exacerbation of chronic hepatitis B infection.
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Tan Y, Chen Y, Yu L, Zhu H, Meng X, Huang X, Meng L, Ding M, Wang Z, Shan L. Two-fold elevation of expression of FoxM1 transcription factor in mouse embryonic fibroblasts enhances cell cycle checkpoint activity by stimulating p21 and Chk1 transcription. Cell Prolif 2010; 43:494-504. [PMID: 20887555 DOI: 10.1111/j.1365-2184.2010.00699.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
OBJECTIVES Forkhead Box M1 (FoxM1) transcription factor regulates expression of cell cycle effective genes and is stabilized by checkpoint kinase 2 (Chk2) to stimulate expression of DNA repair enzymes in response to DNA damage. This study intended to test whether FoxM1 is involved in cell cycle checkpoint pathways. MATERIALS AND METHODS Analysis of senescence and cell proliferation in FoxM1 transgenic (TG) mouse embryonic fibroblasts (MEFs) with 2-fold elevation of FoxM1, and overexpression or knockdown of FoxM1 in an inducible FoxM1 expression cell line, or FoxM1 siRNA. Chromatin immunoprecipitation (ChIP), electrophoretic mobility shift assays (EMSA), and cotransfection to determine FoxM1 transcription targets, as well as RNase protection assays and western blot analysis, were performed. RESULTS Two-fold elevation of FoxM1 in FoxM1-TG-MEFs resulted in low levels of cell proliferation and increase in permanent cell cycle arrest at early passages (from passage 6 to 9). These phenotypes correlated with increased phosphorylation of p53 on Ser15, elevated expression of cell cycle inhibitor p21 and Chk1 at passage 3. FoxM1 was stabilized in response to DNA damage in MEFs and FoxM1 overexpression induced p21. Knockdown of FoxM1 resulted in decrease in Chk1. ChIP, EMSA and cotransfection assays confirmed that FoxM1 stimulated promoters of p21 and Chk1. CONCLUSIONS Chk1 and p21 are direct transcription targets of FoxM1 and FoxM1 participates in transcriptional responses to stress in normal cells.
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Ding M, Yang P. e0333 Effects of Qiliqiangxin capsule on chronic congestive heart failure in patients. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Qiu W, Sun W, Guo C, Wu Z, Ding M, Shen H. Diagnosis and microsurgery of symptomatic spontaneous spinal epidural hematoma. Ir J Med Sci 2010; 180:241-5. [PMID: 20680702 DOI: 10.1007/s11845-010-0533-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2009] [Accepted: 07/08/2010] [Indexed: 11/28/2022]
Abstract
BACKGROUND Symptomatic spontaneous spinal epidural hematoma (SSEH) is an uncommon cause of cord compression that needs emergent treatment. Without effective management of the symptomatic SSEH, irreversible severe spinal injury would be possible. OBJECTIVES We aimed to investigate the diagnosis and surgical management of symptomatic SSEH. METHODS Five cases of symptomatic SSEH with favorable neurological recovery after emergent microsurgery were prospectively analysed. RESULTS The main clinical presentations were root pain and palsy. The main manifestations of MRI were long-segment epidural lesions of high intensity on T1- and T2-weighted images without enhancement. Laminectomy via posterior approach and hematoma removal were undergone for all patients. All patients achieved full neurological recovery without complications. CONCLUSIONS MRI manifestation assisted with the main clinical symptoms may aid the preoperative diagnosis of SSEH, and the delay in obtaining preoperative Digital subtraction angiography is worthwhile, especially for those with progressive neurological deterioration.
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Ding M, Xu JY, Fan Y. Altered expression of mRNA forHIF-1αand its target genesRTP801andVEGFin patients with oral lichen planus. Oral Dis 2010; 16:299-304. [DOI: 10.1111/j.1601-0825.2009.01645.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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McKenzie S, Mailey B, Artinyan A, Ding M, Lee W, Nissen N, Colquhoun S, Kim J. Milan and UCSF-Expanded Criteria: A Comparative Study of Liver Transplantation Outcomes in the United States. J Surg Res 2010. [DOI: 10.1016/j.jss.2009.11.657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Middleton DG, Annand JRM, Antelo MA, Ayerbe C, Barneo P, Baumann D, Bermuth J, Bernauer J, Blok HP, Böhm R, Bosnar D, Ding M, Distler MO, Friedrich J, Llongo JG, Glazier DI, Golak J, Glöckle W, Grabmayr P, Hehl T, Heim J, Hesselink WHA, Jans E, Kamada H, Mañas GJ, Kohl M, Lapikás L, MacGregor IJD, Martin I, McGeorge JC, Merkel H, Merle P, Monstad K, Moschini F, Müller U, Nogga A, Pérez-Benito R, Pospischil T, Potokar M, Rosner G, Seimetz M, Skibiński R, de Vries H, Walcher T, Watts DP, Weinriefer M, Weiss M, Witała H, Zihlmann B. Investigation of the exclusive 3He(e,e' pn)1H reaction. PHYSICAL REVIEW LETTERS 2009; 103:152501. [PMID: 19905628 DOI: 10.1103/physrevlett.103.152501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2009] [Indexed: 05/28/2023]
Abstract
Cross sections for the 3He(e,e' pn)1H reaction were measured for the first time at energy transfers of 220 and 270 MeV for several momentum transfers ranging from 300 to 450 MeV/c. Cross sections are presented as a function of the momentum of the recoil proton and the momentum transfer. Continuum Faddeev calculations using the Argonne V18 and Bonn-B nucleon-nucleon potentials overestimate the measured cross sections by a factor 5 at low recoil proton momentum with the discrepancy becoming smaller at higher recoil proton momentum.
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Ding M, Kisin ER, Zhao J, Bowman L, Lu Y, Jiang B, Leonard S, Vallyathan V, Castranova V, Murray AR, Fadeel B, Shvedova AA. Size-dependent effects of tungsten carbide-cobalt particles on oxygen radical production and activation of cell signaling pathways in murine epidermal cells. Toxicol Appl Pharmacol 2009; 241:260-8. [PMID: 19747498 DOI: 10.1016/j.taap.2009.09.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2009] [Revised: 09/03/2009] [Accepted: 09/03/2009] [Indexed: 01/14/2023]
Abstract
Hard metal or cemented carbide consists of a mixture of tungsten carbide (WC) (85%) and metallic cobalt (Co) (5-15%). WC-Co is considered to be potentially carcinogenic to humans. However, no comparison of the adverse effects of nano-sized WC-Co particles is available to date. In the present study, we compared the ability of nano- and fine-sized WC-Co particles to form free radicals and propensity to activate the transcription factors, AP-1 and NF-kappaB, along with stimulation of mitogen-activated protein kinase (MAPK) signaling pathways in a mouse epidermal cell line (JB6 P(+)). Our results demonstrated that nano-WC-Co generated a higher level of hydroxyl radicals, induced greater oxidative stress, as evidenced by a decrease of GSH levels, and caused faster JB6 P(+) cell growth/proliferation than observed after exposure of cells to fine WC-Co. In addition, nano-WC-Co activated AP-1 and NF-kappaB more efficiently in JB6(+/+) cells as compared to fine WC-Co. Experiments using AP-1-luciferase reporter transgenic mice confirmed the activation of AP-1 by nano-WC-Co. Nano- and fine-sized WC-Co particles also stimulated MAPKs, including ERKs, p38, and JNKs with significantly higher potency of nano-WC-Co. Finally, co-incubation of the JB6(+/+) cells with N-acetyl-cysteine decreased AP-1 activation and phosphorylation of ERKs, p38 kinase, and JNKs, thus suggesting that oxidative stress is involved in WC-Co-induced toxicity and AP-1 activation.
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Liu PL, Li L, Zhang YK, Li M, Kane K, Wang YH, Lin JX, Ding M, Wang SF, Zhou L, Hu K. A comparison of two rehabilitation protocols after simultaneous bilateral total knee arthroplasty: a controlled, randomized study. J Int Med Res 2009; 37:746-56. [PMID: 19589258 DOI: 10.1177/147323000903700318] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Post-operative outcomes after simultaneous bilateral total knee arthroplasty in 115 patients randomly assigned to two rehabilitation protocols were compared. The traditional-protocol group performed a series of exercises on one leg and then repeated the same sequence on the other leg. The alternate-protocol group performed the same exercises, but alternated between legs with each individual repetition. Symptoms and function were assessed pre-operatively and at 1, 3, 6 and 12 months post-operatively. The alternate-protocol group had lower visual analogue pain scale scores in the early post-operative period, as well as higher Knee Society Scores and SF-12 physical and mental health summary scores after 1 and 3 months compared with the traditional-protocol group, but there were no differences between the two groups from 6 months post-operatively. There were no significant differences between the groups in terms of range of knee motion or incidence of deep vein thrombosis. The alternate-protocol for rehabilitation resulted in an early return to function and decreased pain levels following simultaneous bilateral total knee arthroplasty and was associated with the potential to produce more positive emotional states and earlier functional independence.
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Ding M, Danielsen CC, Hvid I. Bone density does not reflect mechanical properties in early-stage arthrosis. ACTA ACUST UNITED AC 2009; 72:181-5. [PMID: 11372950 DOI: 10.1080/000164701317323444] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
Subchondral cancellous bone specimens were removed from 10 human postmortem early-stage arthrotic proximal tibiae (mean age 73 (63-81) years) and 10 age- and gender-matched normal proximal tibiae. The early-stage arthrosis was confirmed histologically and the specimens were divided into 4 groups: medial arthrosis, lateral control, normal medial and normal lateral controls. The specimens were tested in compression to determine mechanical properties and then physical/compositional properties. Compared to the normal medial control, we found reductions in ultimate stress, Young's modulus, and failure energy, and an increase in ultimate strain of arthrotic cancellous bone. Bone volume fraction, apparent density, apparent ash density, and collagen density were higher in cancellous bone with arthrosis, but no differences were found in tissue density, mineral and collagen concentrations between arthrotic cancellous bone and the 3 controls. None of the mechanical properties of arthrotic cancellous bone could be predicted by the physical/compositional properties measured. The increase in bone tissue in early-stage arthrotic cancellous bone did not make up for the loss of mechanical properties, which suggests a deterioration in the quality of arthrotic cancellous bone.
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Hu A, Newman F, Rusthoven K, Ding M, Stuhr K, Miften M, Rabinovitch R. SU-FF-T-638: Radiation Treatment Techniques and Gastrointestinal Dose in Breast Patients. Med Phys 2009. [DOI: 10.1118/1.3182136] [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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Ding M, Stuhr K, Newman F, Hu A, Rice H, Miften M. SU-FF-J-73: Targeting Accuracy Using Exac-Trac® and Synergy® CBCT Image-Guided Radiotherapy Systems for Lung Stereotactic Body Radiotherapy. Med Phys 2009. [DOI: 10.1118/1.3181365] [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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Ding M, Tong R, Liao SH, Dong J. An extension to 3D topological thinning method based on LUT for colon centerline extraction. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2009; 94:39-47. [PMID: 19046790 DOI: 10.1016/j.cmpb.2008.10.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2007] [Revised: 01/28/2008] [Accepted: 10/06/2008] [Indexed: 05/27/2023]
Abstract
Topological thinning is a valid but time-consuming method to calculate the centerline of human colon or other hollow organs accurately. An optimized 3D topological thinning method based on Look-up Table (LUT), which was proposed by Sadlier, proves to be effective in improving the efficiency on many occasions. However, it is still inefficient when processing some complex datasets. In this paper, we first analyze the reason causing the unstable performance, and then present an extension to Sadlier's method, which enables the rapid execution of the extraneous loops removing by avoiding unnecessary global connectivity testing. To reach this purpose, a min-heap structure is introduced to select a seed from the candidate voxels set of the final centerline, and region growing technique is used to find the voxels in the same branch with the seed. The comparison among the standard topological thinning, LUT method and the extension to LUT method indicates the extension achieves the most efficient performance.
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Xu L, Stoica P, Li J, Bressler SL, Shao X, Ding M. ASEO: A Method for the Simultaneous Estimation of Single-Trial Event-Related Potentials and Ongoing Brain Activities. IEEE Trans Biomed Eng 2009. [DOI: 10.1109/tbme.2007.901025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yang D, Ding M, Mo Y, Zhang Q, Wang W, Li Y. The impact of chemotherapy on ovarian function in premenopausal patients with breast cancer. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.07.879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Jiang W, Bai Z, Zhang D, Shi Y, Yong J, Chen S, Ding M, Deng H. Differentiation of mouse nuclear transfer embryonic stem cells into functional pancreatic beta cells. Diabetologia 2008; 51:1671-9. [PMID: 18581093 DOI: 10.1007/s00125-008-1065-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/13/2008] [Accepted: 04/18/2008] [Indexed: 10/21/2022]
Abstract
AIMS/HYPOTHESIS Therapeutic cloning has been reported to have potential in the treatment of several degenerative diseases. However, it has yet to be determined whether mouse nuclear transfer-embryonic stem cells (NT-ESCs) can be differentiated into pancreatic beta cells and used to reverse diabetes in an animal model. METHODS We first used the somatic nuclear transfer technique to generate mouse NT-ESCs and then developed a chemically defined stepwise protocol to direct the NT-ESCs into functional pancreatic beta cells. We examined the gene expression pattern of the differentiated NT-ESCs and transplanted the NT-ESC-derived insulin-producing cells into recipient diabetic mice. RESULTS Four mouse NT-ESC lines were first established using an improved nuclear transfer technique and insulin-producing cells were efficiently generated from NT-ESCs by mimicking pancreatic in vivo development. Most of the insulin-producing cells that we generated co-produced pancreatic and duodenal homeobox 1, but not glucagon at the final stage of this differentiation method, which differed from the insulin and glucagon co-production reported by other groups. The differentiated NT-ESCs were able to release insulin in response to glucose stimuli and normalise the blood glucose level of diabetic mice for at least 2 months. CONCLUSIONS/INTERPRETATION These results demonstrate the potential of therapeutic cloning for cell therapy of type 1 diabetes in a mouse model.
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Zhang Y, Chen Y, Bressler SL, Ding M. Response preparation and inhibition: the role of the cortical sensorimotor beta rhythm. Neuroscience 2008; 156:238-46. [PMID: 18674598 DOI: 10.1016/j.neuroscience.2008.06.061] [Citation(s) in RCA: 187] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2008] [Revised: 06/23/2008] [Accepted: 06/24/2008] [Indexed: 10/21/2022]
Abstract
Paradigms requiring either a GO or a NO-GO response are often used to study the neural mechanisms of response inhibition. Here this issue is examined from the perspective of event-related beta (14-30 Hz) oscillatory activity. Two macaque monkeys performed a task that began with a self-initiated lever depression and maintenance (sustained motor output) and required a visual pattern discrimination followed by either a lever release (GO) or continued lever-holding (NO-GO) response. Analyzing simultaneous local field potentials (LFPs) from primary somatosensory, frontal motor, and posterior parietal cortices, we report two results. First, beta oscillation desynchronized shortly after stimulus presentation, the onset of which was approximately the same for both the GO and NO-GO conditions ( approximately 110 ms). Since it is well known that beta desynchronization is a reliable indicator of movement preparation, this result suggests that early motor preparation took place in both conditions. Second, following the GO/NO-GO decision ( approximately 190 ms), beta activity rebounded significantly ( approximately 300 ms) only in the NO-GO condition. Coherence and Granger causality measures revealed that the dynamical organization of the rebounded beta network was similar to that existing during the sustained motor output prior to stimulus onset. This finding suggests that response inhibition led to the restoration of the sensorimotor network to its prestimulus state.
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Ding M, Newman F, Gaspar L, Kavanagh B, Stuhr K, Raben D, Li JS, Ma CM. A 4D treatment planning tool for the evaluation of motion effects on lung cancer treatments. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/102/1/012008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ding M, Lu L, Toth LA. Gene expression in lung and basal forebrain during influenza infection in mice. GENES BRAIN AND BEHAVIOR 2008; 7:173-83. [PMID: 17696998 DOI: 10.1111/j.1601-183x.2007.00335.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Inbred mice develop strain-dependent changes in sleep during the first few days after inoculation with influenza virus. To identify genes with the potential to differentially modulate sleep under this condition, we performed complementary DNA microarray analysis of both lung and basal forebrain (BF) of infected (I) and uninfected BALB/cByJ (C) and C57BL/6J (B6) mice. This analysis showed significant variation in the expression pattern of 667 and 1217 of the surveyed genes in BF and lung, respectively (P < 0.01). Applying the additional criterion of an effect size >or=2, 495 genes differed in expression in lung compared with 204 in BF. In BF, more genes were differentially expressed as a function of mouse strain, whereas in lung, more genes were differentially expressed as a function of health status. Significant alterations in expression after infection were more numerous and robust in BALB/cByJ vs. C57BL/6J mice. Some genes showed significant variation in both tissues as a function of strain or condition, but the changes in general were not parallel. Genes that showed significant and robust variation as a function of strain, health status or tissue included those related to immune function, metabolism, signal transduction, cell cycle regulation, apoptosis and other miscellaneous categories. Different patterns of gene expression in BF of uninfected mice suggest the possibility of fundamental mechanistic differences in pathways that modulate vigilance in these strains, whereas differences in expression of lung of infected mice suggests different peripherally generated sleep-modulatory stimuli in the two strains.
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Qing T, Liu H, Wei W, Ye X, Shen W, Zhang D, Song Z, Yang W, Ding M, Deng H. Mature oocytes derived from purified mouse fetal germ cells. Hum Reprod 2007; 23:54-61. [DOI: 10.1093/humrep/dem334] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Wang YH, Zhang ZK, He HP, Wang JS, Zhou H, Ding M, Hao XJ. Stilbene C-glucosides from Cissus repens. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2007; 9:631-636. [PMID: 17943557 DOI: 10.1080/10286020600979548] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Four new stilbene C-glucosides, namely trans-3-O-methyl-resveratrol-2-C-beta-glucoside (1), cis-3-O-methyl-resveratrol-2-C-beta-glucoside (2), trans-3-O-methyl-resveratrol-2-(2-p-coumaric)-C-beta-glucoside (cissuside A) (3), and trans-3-O-methyl-resveratrol-2-(3-p-coumaric)-C-beta-glucoside (cissuside B) (4), were isolated from the aerial parts of Cissus repens, along with known trans-resveratrol (5), trans-resveratrol-2-C-beta-glucoside (6) and cis-resveratrol-2-C-beta-glucoside (7). Their structures were established by spectroscopic methods. Stilbene C-glucosides were found in the genus Cissus for the first time.
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Asadi-Zeydabadi M, Newman F, Stuhr K, Ding M, Durairaj V, Kavanagh B. TU-C-AUD-01: Visual Sensations During Megavoltage Radiotherapy to the Orbit Attributable to Cherenkov Radiation. Med Phys 2007. [DOI: 10.1118/1.2761350] [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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Abstract
Abstract
Conventional capillary number theory predicts that residual oil will not be mobilized until a critical capillary number (2E - 5) is exceeded. This theory was tested to determine residual oil saturation mobilization after forced water imbibition. In the literature, high residual oil saturation was established from waterflooding at a certain pressure. Then gradually increasing pressure was applied for water injection until residual oil production was observed. It was confirmed that this critical capillary number is applicable when the initial residual oil saturation was estimated from spontaneous water imbibition tests. The same types of experiments were repeated for gas-liquid systems by creating the initial residual gas saturation through spontaneous oil or water imbibition tests on the same samples. The procedures, which included spontaneous imbibition tests followed by forced imbibition tests, were monitored by an on-line NMR system. Analysis of the experimental results produced an estimate of the critical capillary number for mobilizing residual gas from water imbibition or oil imbibition tests. In this research, we broadened the term of "imbibition" for both water and oil terms since, compared to gas, both water and oil are in the wetting phase. It was found that the critical capillary number for a gas-liquid system is very different from that of an oil-water system in the same type of rock.
Berea sandstone plugs were used in all the experiments. The reason for using Berea sandstone plugs is due to their relatively homogeneous pore structure. Additional Western Canadian sandstone plugs were used for testing gas-water systems to confirm the results obtained from the Berea sandstone plugs. Understanding the different mechanisms to produce discontinuous residual oil or residual gas is important for enhanced oil and gas recovery operations. Hopefully, this research can provide new insights into recovering additional gas from gas reservoirs with active aquifers.
Introduction
Increasing the capillary number has long been investigated as a strategy for improving oil recovery. Many methodologies around increasing the capillary number have been either tested in the laboratory or applied in the field. Capillary number is defined as the ratio of viscous forces to capillary forces. Evaluation of the capillary number can be used to describe the relative importance of viscous forces to capillary forces during immiscible displacements. There are various forms of the capillary number. The most common versions of capillary number are those by Saffman and Taylor(1):
Equation (1) (Available in full paper)
and Melrose and Brandner(2):
Equation (2) (Available in full paper)
When non-wetting phase oil is trapped in porous media, the pressure gradient required to move it through a capillary tube is much higher than what would be predicted by the pipe flow equation, due to the pressure discontinuity at the wetting/non-wetting interface. Because of the contact angle hysteresis, this discontinuity is not of the same magnitude on both sides of the discontinuous non-wetting phase. For example, in a water-wet medium, an oil droplet represents the discontinuous non-wetting phase. As the oil droplet is pushed through a pore throat, its downstream end gets squeezed into a much narrower segment making its radius of curvature much smaller than the upstream part.
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Ding M, Cui S, Li C, Jothy S, Haase V, Steer B, Marsden P, Pippin J, Shankland S, Rastaldi M, Cohen C, Kretzler M, Quaggin S. Faulty Podocyte Hypoxia Sensing—A Novel Pathway for Rapidly Progressive Glomerulonephritis. J Am Soc Nephrol 2006. [DOI: 10.1681/asn.2006101148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Ding M, Xing L, Xiong W, Stuhr K, Newman F. 2797. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.1215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Schwer A, Borges V, Ding M, Kavanagh B. 2698. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.1114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Bridgland-Taylor MH, Hargreaves AC, Easter A, Orme A, Henthorn DC, Ding M, Davis AM, Small BG, Heapy CG, Abi-Gerges N, Persson F, Jacobson I, Sullivan M, Albertson N, Hammond TG, Sullivan E, Valentin JP, Pollard CE. Optimisation and validation of a medium-throughput electrophysiology-based hERG assay using IonWorks™ HT. J Pharmacol Toxicol Methods 2006; 54:189-99. [PMID: 16563806 DOI: 10.1016/j.vascn.2006.02.003] [Citation(s) in RCA: 139] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2005] [Accepted: 02/12/2006] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Regulatory and competitive pressure to reduce the QT interval prolongation risk of potential new drugs has led to focus on methods to test for inhibition of the human ether-a-go-go-related gene (hERG)-encoded K+ channel, the primary molecular target underlying this safety issue. Here we describe the validation of a method that combines medium-throughput with direct assessment of channel function. METHODS The electrophysiological and pharmacological properties of hERG were compared using two methods: conventional, low-throughput electrophysiology and planar-array-based, medium-throughput electrophysiology (IonWorks HT). A pharmacological comparison was also made between IonWorks HT and an indirect assay (Rb+ efflux). RESULTS Basic electrophysiological properties of hERG were similar whether recorded conventionally (HEK cells) or using IonWorks HT (CHO cells): for example, tail current V1/2 -12.1+/-5.0 mV (32) for conventional and -9.5+/-6.0 mV (46) for IonWorks HT (mean+/-S.D. (n)). A key finding was that as the number of cells per well was increased in IonWorks HT, the potency reported for a given compound decreased. Using the lowest possible cell concentration (250,000 cells/ml) and 89 compounds spanning a broad potency range, the pIC50 values from IonWorks HT (CHO-hERG) were found to correlate well with those obtained using conventional methodology (HEK-hERG)(r=0.90; p<0.001). Further validation using CHO-hERG cells with both methods confirmed the correlation (r=0.94; p<0.001). In contrast, a comparison of IonWorks HT and Rb+ efflux data with 649 compounds using CHO-hERG cells showed that the indirect assay consistently reported compounds as being, on average, 6-fold less potent, though the differences varied depending on chemical series. DISCUSSION The main finding of this work is that providing a relatively low cell concentration is used in IonWorks HT, the potency information generated correlates well with that determined using conventional electrophysiology. The effect on potency of increasing cell concentration may relate to a reduced free concentration of test compound owing to partitioning into cell membranes. In summary, the IonWorks HT hERG assay can generate pIC50 values based on a direct assessment of channel function in a timeframe short enough to influence chemical design.
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Ding M, Stuhr K, Newman F, Johnson T, Kavanagh B. SU-FF-J-17: Accuracy and Dosimetric Advantage of Target Localization Using Stereoscopic Image-Guided Radiotherapy for Lung Cancer Treatment. Med Phys 2006. [DOI: 10.1118/1.2240796] [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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139
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Ding M, Xing L, Newman F. SU-FF-T-300: Investigation of Respiratory Motion Effect On Lung Tumor Radiotherapy Using 4D Monte Carlo Treatment Planning and 4D CT. Med Phys 2006. [DOI: 10.1118/1.2241217] [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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Ding M, Danielsen CC, Hvid I. Age-related three-dimensional microarchitectural adaptations of subchondral bone tissues in guinea pig primary osteoarthrosis. Calcif Tissue Int 2006; 78:113-22. [PMID: 16397735 DOI: 10.1007/s00223-005-0028-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2005] [Accepted: 09/13/2005] [Indexed: 11/24/2022]
Abstract
We explored potential mechanisms of the microarchitectural adaptations of subchondral bone tissues in a guinea pig primary osteoarthrosis (OA) model. We harvested proximal tibiae of male Dunkin-Hartley (Charles River strain) guinea pigs at 3, 6, 9, 12, and 24 months of age (10 in each group). These proximal tibiae were scanned by micro-computed tomography to quantify the three-dimensional microarchitecture of the subchondral plate, cancellous bone, and cortical bone. Subsequently, the bones were compression-tested to determine their mechanical properties. Furthermore, bone collagen, bone mineral, and bone density were determined. Mankin's score corresponded to OA grading from absent or minimal cartilage degeneration in 3-month-old to severe degeneration in 24-month-old guinea pigs. In young guinea pigs, the volume fraction and thickness of the subchondral plate markedly increased from 3 to 6 months, whereas the volume fraction of the subchondral cancellous bone displayed an initial decline followed by an increase. With age, the trabeculae increased in thickness, changed from rod-like to plate-like, and became more axially oriented. An increasing ratio of bone collagen to mineral in subchondral bone indicated undermineralized bone tissues. In subchondral cancellous bone, Young's modulus was maximal at 6 months of age, whereas ultimate stress and failure energy showed a gradual increase with age. The findings show pronounced alterations of the microarchitecture and bone matrix composition of the subchondral bone. These alterations did not appear to follow the same pattern as in normal aging and may have different influences on the resulting mechanical properties.
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Ding M, Kananagh B, Schefter T, Stuhr K, Newman F. The Influence of Heterogeneity Corrections on Tumor and Normal Lung Dosimetry in Stereotactic Body Radiation Therapy for Lung Cancer Treatment. Int J Radiat Oncol Biol Phys 2005. [DOI: 10.1016/j.ijrobp.2005.07.867] [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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Eckardt H, Ding M, Lind M, Hansen ES, Christensen KS, Hvid I. Recombinant human vascular endothelial growth factor enhances bone healing in an experimental nonunion model. ACTA ACUST UNITED AC 2005; 87:1434-8. [PMID: 16189323 DOI: 10.1302/0301-620x.87b10.16226] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The re-establishment of vascularity is an early event in fracture healing; upregulation of angiogenesis may therefore promote the formation of bone. We have investigated the capacity of vascular endothelial growth factor (VEGF) to stimulate the formation of bone in an experimental atrophic nonunion model. Three groups of eight rabbits underwent a standard nonunion operation. This was followed by interfragmentary deposition of 100 μg VEGF, carrier alone or autograft. After seven weeks, torsional failure tests and callus size confirmed that VEGF-treated osteotomies had united whereas the carrier-treated osteotomies failed to unite. The biomechanical properties of the groups treated with VEGF and autograft were identical. There was no difference in bone blood flow. We considered that VEGF stimulated the formation of competent bone in an environment deprived of its normal vascularisation and osteoprogenitor cell supply. It could be used to enhance the healing of fractures predisposed to nonunion.
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Cormier JN, Xing Y, Ding M, Ross MI, Lee JE, Mansfield PF, Gershenwald JE, Du XL. Population based assessment of surgical treatment trends for melanoma patients. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.7509] [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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Ding M, Newman F, Stuhr K, Johnson T. SU-FF-T-350: A Comparative Dosimetric Study of Three-Dimensional Conformal, Dynamic Conformal Arc, and Intensity Modulated Radiation Therapy for Brain Tumor Treatment. Med Phys 2005. [DOI: 10.1118/1.1998079] [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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Ding M, Newman F, Stuhr K. SU-FF-T-413: The Impact of Heterogeneity Correction On Tumor Dosimetry for Lung Cancer Stereotactic Body Radiation Therapy. Med Phys 2005. [DOI: 10.1118/1.1998212] [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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Chen L, Price RA, Nguyen TB, Wang L, Li JS, Qin L, Ding M, Palacio E, Ma CM, Pollack A. Dosimetric evaluation of MRI-based treatment planning for prostate cancer. Phys Med Biol 2005; 49:5157-70. [PMID: 15609565 DOI: 10.1088/0031-9155/49/22/010] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The purpose of this study is to evaluate the dosimetric accuracy of MRI-based treatment planning for prostate cancer using a commercial radiotherapy treatment planning system. Three-dimensional conformal plans for 15 prostate patients were generated using the AcQPlan system. For each patient, dose distributions were calculated using patient CT data with and without heterogeneity correction, and using patient MRI data without heterogeneity correction. MR images were post-processed using the gradient distortion correction (GDC) software. The distortion corrected MR images were fused to the corresponding CT for each patient for target and structure delineation. The femoral heads were delineated based on CT. Other anatomic structures relevant to the treatment (i.e., prostate, seminal vesicles, lymph notes, rectum and bladder) were delineated based on MRI. The external contours were drawn separately on CT and MRI. The same internal contours were used in the dose calculation using CT- and MRI-based geometries by directly transferring them between MRI and CT as needed. Treatment plans were evaluated based on maximum dose, isodose distributions and dose-volume histograms. The results confirm previous investigations that there is no clinically significant dose difference between CT-based prostate plans with and without heterogeneity correction. The difference in the target dose between CT- and MRI-based plans using homogeneous geometry was within 2.5%. Our results suggest that MRI-based treatment planning is suitable for radiotherapy of prostate cancer.
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Zuo Y, Ding M, Bateni A, Hoorfar M, Neumann A. Improvement of interfacial tension measurement using a captive bubble in conjunction with axisymmetric drop shape analysis (ADSA). Colloids Surf A Physicochem Eng Asp 2004. [DOI: 10.1016/j.colsurfa.2004.04.081] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Zuo YY, Ding M, Li D, Neumann AW. Further development of Axisymmetric Drop Shape Analysis-Captive Bubble for pulmonary surfactant related studies. Biochim Biophys Acta Gen Subj 2004; 1675:12-20. [PMID: 15535963 DOI: 10.1016/j.bbagen.2004.08.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2004] [Revised: 07/23/2004] [Accepted: 08/03/2004] [Indexed: 11/20/2022]
Abstract
The methodology combining Axisymmetric Drop Shape Analysis (ADSA) with a captive bubble (ADSA-CB) facilitates pulmonary surfactant related studies. The accuracy of ADSA-CB is crucially dependent on the quality of the bubble profile extracted from the raw image. In a previous paper, an image analysis scheme featuring a Canny edge detector and a Axisymmetric Liquid Fluid Interfaces-Smoothing (ALFI-S) algorithm was developed to process captive bubble images under a variety of conditions, including images with extensive noise and/or lack of contrast. A new version of ADSA-CB based on that image analysis scheme is developed and applied to pulmonary surfactant and pulmonary surfactant-polymer systems. The new version is found to be highly noise-resistant and well self-adjusting.
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Kozlov A, Sarty AJ, Aniol KA, Bartsch P, Baumann D, Bertozzi W, Bohinc K, Böhm R, Chen JP, Dale D, Dennis L, Derber S, Ding M, Distler MO, Dragovitsch P, Ewald I, Fissum KG, Friedrich J, Friedrich JM, Geiges R, Gilad S, Jennewein P, Kahrau M, Kohl M, Krygier KW, Liesenfeld A, Margaziotis DJ, Merkel H, Merle P, Müller U, Neuhausen R, Pospischil T, Potokar M, Riccardi G, Roché R, Rosner G, Rowntree D, Schmieden H, Sirca S, Templon JA, Thompson MN, Wagner A, Walcher T, Weis M, Zhao J, Zhou ZL, Golak J, Glöckle W, Witała H. Measurement of the exclusive 3He(e,e'p) reaction below the quasielastic peak. PHYSICAL REVIEW LETTERS 2004; 93:132301. [PMID: 15524710 DOI: 10.1103/physrevlett.93.132301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2002] [Revised: 12/16/2003] [Indexed: 05/24/2023]
Abstract
New, high-precision measurements of the 3He(e,e(')p) reaction using the A1 Collaboration spectrometers at the Mainz microtron MAMI are presented. These were performed in antiparallel kinematics at energy transfers below the quasielastic peak, and at a central momentum transfer of 685 MeV/c. Cross sections and distorted momentum distributions were extracted and compared to theoretical predictions and existing data. The longitudinal and transverse behavior of the cross section was also studied. Sizable differences in the cross-section behavior from theoretical predictions based on the plane wave impulse approximation were observed in both the two- and three-body breakup channels. Full Faddeev-type calculations account for some of the observed excess cross-section, but significant differences remain.
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