901
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Zhang C, Zheng S, Wang Y, Zhu J, Zhu X, Zhao Y, Ge L. Novel RUNX2 Mutations in Chinese Individuals with Cleidocranial Dysplasia. J Dent Res 2009; 88:861-6. [PMID: 19767586 DOI: 10.1177/0022034509342083] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Cleidocranial dysplasia (CCD) is an inherited autosomal-dominant skeletal disease caused by heterozygous mutations in the osteoblast-specific transcription factor, RUNX2. We performed mutation analysis of RUNX2 on four unrelated Chinese individuals with CCD. Three novel distinct mutations were detected in the coding region of RUNX2: two missense and one frameshift. These mutations were exclusively clustered within the Runt domain. One missense mutation converts threonine to isoleucine at codon 200 (T200I). The other one substitutes leucine for arginine at codon 225 (R225L), which affects many family members. The frame-shift mutation (214fs) in exon3 leads to the introduction of a translational stop codon at codon 221, resulting in a truncated RUNX2 protein. The reporter gene assays revealed that all the mutants exhibited significantly reduced transactivation activities on the osteocalcin promoter. Our results provide new genetic evidence that mutations involved in RUNX2 contribute to CCD. Abbreviations: AML3, gene encoding acute myeloid leukemia protein 3; bp, base pair; CBFA1, gene encoding core-binding factor 1; CBFβ, gene encoding core-binding factor β; CCD, cleidocranial dysplasia; NLS, nuclear localization signal; OSE2, osteoblast-specific cis-acting element 2; PEBP2A, gene encoding polyoma enhancer binding protein 2A; PST, proline/serine/ threonine-rich domain; Q/A, glutamine-alanine repeat domain; Runt, Runt Homology Domain; RUNX2, the mammalian runt-related genes 2; RUNX2, Runt-related protein 2.
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902
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Xu S, Zhu X, Zhu C, Xie J. 8022 Prognostic factors and survival analysis in pre- and postmenopausal patients with epithelial ovarian cancer. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)71544-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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903
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Yao H, Peng F, Fan Y, Zhu X, Hu G, Buch SJ. TRPC channel-mediated neuroprotection by PDGF involves Pyk2/ERK/CREB pathway. Cell Death Differ 2009; 16:1681-93. [PMID: 19680266 PMCID: PMC2783976 DOI: 10.1038/cdd.2009.108] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Platelet-derived growth factor-BB (PDGF) has been reported to provide tropic support for neurons in the central nervous system. The protective role of PDGF on dopaminergic neurons, especially in the context of HIV-associated dementia (HAD), however, remains largely unknown. Here, we show that exogenous PDGF was neuroprotective against toxicity induced by HIV-1 Tat in primary midbrain neurons. Furthermore, we report the involvement of transient receptor potential canonical (TRPC) channels in PDGF-mediated neuroprotection. TRPC channels are Ca(2+)-permeable, nonselective cation channels with a variety of physiological functions. Blocking TRPC channels with either a blocker or short-interfering RNAs (specific for TRPC 5 and 6) in primary neurons resulted in suppression of both PDGF-mediated neuroprotection as well as elevations in intracellular Ca(2+). PDGF-mediated neuroprotection involved parallel but distinct ERK/CREB and PI3K/Akt pathways. TRPC channel blocking also resulted in suppression of PDGF-induced Pyk2/ERK/CREB activation, but not Akt activation. Relevance of these findings in vivo was further corroborated by intrastriatal injections of PDGF and HIV-1 Tat in mice. Administration of PDGF was able to rescue the dopaminergic neurons in the substantia nigra from Tat-induced neurotoxicity. This effect was attenuated by pre-treatment of mice with the TRP blocker, thus underscoring the novel role of TRPC channels in the neuroprotection mediated by PDGF.
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904
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Zhu X, Bourland JD, Yuan Y, Zhuang T, O'Daniel J, Thongphiew D, Wu QJ, Das SK, Yoo S, Yin FF. Tradeoffs of integrating real-time tracking into IGRT for prostate cancer treatment. Phys Med Biol 2009; 54:N393-401. [PMID: 19661570 DOI: 10.1088/0031-9155/54/17/n03] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This study investigated the integration of the Calypso real-time tracking system, based on implanted ferromagnetic transponders and a detector array, into the current process for image-guided radiation treatment (IGRT) of prostate cancer at our institution. The current IGRT process includes magnetic resonance imaging (MRI) for prostate delineation, CT simulation for treatment planning, daily on-board kV and CBCT imaging for target alignment, and MRI/MRS for post-treatment assessment. This study assesses (1) magnetic-field-induced displacement and radio-frequency (RF)-induced heating of transponders during MRI at 1.5 T and 3 T, and (2) image artifacts caused by transponders and the detector array in phantom and patient cases with the different imaging systems. A tissue-equivalent phantom mimicking prostate tissue stiffness was constructed and implanted with three operational transponders prior to phantom solidification. The measurements show that the Calypso system is safe with all the imaging systems. Transponder position displacements due to the MR field are minimal (<1.0 mm) for both 1.5 T and 3 T MRI scanners, and the temperature variation due to MRI RF heating is <0.2 degrees C. The visibility of transponders and bony anatomy was not affected on the OBI kV and CT images. Image quality degradation caused by the detector antenna array is observed in the CBCT image. Image artifacts are most significant with the gradient echo sequence in the MR images, producing null signals surrounding the transponders with radii approximately 1.5 cm and length approximately 4 cm. Thus, Calypso transponders can preclude the use of MRI/MRS in post-treatment assessment. Modifications of the clinical flow are required to accommodate and minimize the substantial MRI artifacts induced by the Calypso transponders.
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905
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Yang M, Virshup G, Clayton J, Zhu X, Mohan R, Dong L. WE-C-BRB-01: In Vivo Measurement of Proton Stopping Power Ratios in Patients Using Dual Energy Computed Tomography. Med Phys 2009. [DOI: 10.1118/1.3182459] [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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906
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Grant R, Ibbott G, Sahoo N, Tucker S, Zhu X, Followill D. SU-FF-T-370: Evaluation of An Anthropomorphic Pelvis Phantom for Proton Therapy. Med Phys 2009. [DOI: 10.1118/1.3181851] [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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907
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Robertson D, Zhang X, Li Y, Lee A, Gillin M, Zhu X, Mohan R. SU-FF-T-150: Optimizing Spot Spacing and Margin for Intensity-Modualted Proton Therapy Planning. Med Phys 2009. [DOI: 10.1118/1.3181624] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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908
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Yu J, Zhu M, Fu Z, Zhu X, Zhao Y, Chen B. Vasorelaxing action of vasonatrin peptide is associated with activation of large-conductance Ca(2+)-activated potassium channels in vascular smooth muscle cells. Physiol Res 2009; 59:187-194. [PMID: 19537928 DOI: 10.33549/physiolres.931746] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The aim of this study was to test the hypothesis that vasorelaxing action of vasonatrin peptide (VNP) is due to activation of the large-conductance Ca(2+)-activated potassium channel (BK(Ca)) via guanylyl cyclase (GC)-coupled natriuretic peptide receptors (NPRs) in vascular smooth muscle cells (VSMCs). Contraction experiments were performed using human radial artery, whereas BK(Ca) current by patch clamp was recorded in cells from rat mesenteric artery. Contractility of rings cut from human radial artery was detected in vitro. As a result, VNP induced a dose-dependent vasorelaxation of human radial artery, which could be mimicked by 8-Br-cGMP, and suppressed by TEA, a blocker of BK(Ca), HS-142-1, a blocker of GC-coupled NPRs, or methylene blue (MB), a selective inhibitor of guanylyl cyclase. Sequentially, whole-cell K(+) currents were recorded using patch clamp techniques. BK(Ca) current of VSMCs isolated from rat mesentery artery was obtained by subtracting the whole cell currents after applications of 10(-7) mol/l iberiotoxin (IBX) from before its applications. In accordance with the results of arterial tension detection, BK(Ca) current was significantly magnified by VNP, which could also be mimicked by 8-Br-cGMP, whereas suppressed by HS-142-1, or MB. Taken together, VNP acts as a potent vasodilator, and NPRA/B-cGMP-BK(Ca) is one possible signaling system involved in VNP induced relaxation.
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909
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Li H, Zhu X, Ciangaru G, Sahoo N, Suzuki K, Lee A, Gillin M. SU-FF-T-288: Spot Position Uncertainty of Scanning Proton Pencil Beam. Med Phys 2009. [DOI: 10.1118/1.3181765] [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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910
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Wu QJ, McMahon R, Chang Z, Zhuang T, O'Daniel J, Yoo S, Zhu X, Yin F. SU-FF-T-301: Clinical Implementation and Commission of Volumetric Modulated Arc Therapy. Med Phys 2009. [DOI: 10.1118/1.3181779] [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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911
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Sawakuchi G, Tit U, Ciangaru G, Mirkovic D, Zhu X, Mohan R. SU-FF-T-425: The Causes of the Lateral Envelop of Low Doses in Scanning Proton Beamlets. Med Phys 2009. [DOI: 10.1118/1.3181907] [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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912
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Knopf A, Zhu X, Parodi K, Paganetti H, Bortfeld T, El Fakhri G. SU-FF-J-129: In-Room Proton Range Verification Using Mobile NeuroPET - Feasibility Study. Med Phys 2009. [DOI: 10.1118/1.3181421] [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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913
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Ciangaru G, Sahoo N, Zhu X, Sawakuchi G, Gillin M. WE-E-BRD-07: Algorithm for Accurate Computation of Doses From Large-Angle Scattering of Scanned Proton Pencil Beams. Med Phys 2009. [DOI: 10.1118/1.3182559] [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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914
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Wang X, Sahoo N, Zhu X, Ding X, Arjomandy B, Ciangaru G, Gillin M. SU-FF-T-268: Study of Field Size Factors for Passively Scattered Proton Therapy Beams. Med Phys 2009. [DOI: 10.1118/1.3181745] [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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915
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Matney J, Vedam S, Dong L, Amos R, Zhu X, Balter P, Mohan R. MO-FF-A2-03: Is Average CT a Good Estimate of Mid-Ventilation Position of Surrounding Normal Structures for Proton Therapy Treatment Planning of Lung Tumors? Med Phys 2009. [DOI: 10.1118/1.3182285] [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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916
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Thongphiew D, Zhu X, Wu Q, Wu Q, Yin F. SU-FF-T-80: Hybrid Image Guided Radiation Therapy for Hypofractionated Prostate IMRT: Feasibility Study. Med Phys 2009. [DOI: 10.1118/1.3181553] [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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917
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Zhou H, Xu J, Rodriguez M, van den Haak F, Zhu X, Xian Y, Nelson G, Jogani R, Keall P, Graves E. TH-C-BRC-10: Evaluation of a Micro-CT Based 3D Conformal Animal Radiotherapy System. Med Phys 2009. [DOI: 10.1118/1.3182624] [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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918
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Zhu X, Bourland J, Yuan Y, Zhuang T, O'Daniel J, Thongphiew D, Wu Q, Das S, Yoo S, Yin F. SU-FF-J-56: Integrating Real-Time Tracking Into Image Guided Radiation Therapy for Prostate Cancer Treatment. Med Phys 2009. [DOI: 10.1118/1.3181348] [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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919
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Zhu X, Sahoo N, Sawakuchi G, Lii M, Ciangaru G, Bues M, Pan X, Zhang X, Ding X, Titt U, Arjomandy B, Suzuki K, Mohan R, Gillin M. SU-FF-T-618: Configuration and Validation of a Double Gaussian Dose Model for Scanning Proton Beams. Med Phys 2009. [DOI: 10.1118/1.3182116] [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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920
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Zhu X, Titt U, Bues M, Sahoo N, Ciangaru G, Sawakuchi G, Poenisch F, Lii M, Zhang X, Li Y, Arjomandy B, Suzuki K, Mohan R, Gillin M. SU-FF-T-617: Configuration and Validation of a Single Gaussian Dose Model for Scanning Proton Beams. Med Phys 2009. [DOI: 10.1118/1.3182115] [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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921
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Giebeler A, Zhu X, Starkschall G, Balter P, Titt U, Tucker S, Newhauser W. SU-FF-T-625: Estimation of Uncertainty for the Patient and Compensator Scatter Correction Factor in Proton Therapy D/MU Calculations. Med Phys 2009. [DOI: 10.1118/1.3182123] [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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922
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Li H, Lee A, Zhu X, Kudchadker R. SU-FF-T-258: The Effect of Treatment Couch Attenuation On Radiation Dose for Megavoltage Photon Beams. Med Phys 2009. [DOI: 10.1118/1.3181735] [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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923
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Sahoo N, Martin C, Zhu X, Ding X, Arjomandy B, Ciangaru G, Gillin M. SU-FF-T-278: Study of Differences in Lateral Penumbra Widths of Passively Scattered and Spot Scanned Proton Therapy Beams. Med Phys 2009. [DOI: 10.1118/1.3181755] [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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924
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Both S, Zhu T, Finlay J, Zhu X, Slopsema R, Dolney D, McDonough J. SU-FF-T-195: An Independent Program for MU Check of Modulated Scanning Beam for IMPT. Med Phys 2009. [DOI: 10.1118/1.3181670] [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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925
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Sawakuchi G, Titt U, Mirkovic D, Zhu X, Sahoo N, Bues M, Ciangaru G, Poenisch F, Suzuki K, Arjomandy B, Gillin M, Mohan R. WE-E-BRD-06: Validation of An MCNPX Monte Carlo Model of a Discrete-Spot Scanning Beam Nozzle and Evaluation of the Beamlet Lateral Envelope of Low Doses. Med Phys 2009. [DOI: 10.1118/1.3182558] [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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