151
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Ding H, Underwood R, Lavalley N, Yacoubian TA. 14-3-3 inhibition promotes dopaminergic neuron loss and 14-3-3θ overexpression promotes recovery in the MPTP mouse model of Parkinson's disease. Neuroscience 2015; 307:73-82. [PMID: 26314634 DOI: 10.1016/j.neuroscience.2015.08.042] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 07/25/2015] [Accepted: 08/18/2015] [Indexed: 01/15/2023]
Abstract
14-3-3s are a highly conserved protein family that plays important roles in cell survival and interact with several proteins implicated in Parkinson's disease (PD). Disruption of 14-3-3 expression and function has been implicated in the pathogenesis of PD. We have previously shown that increasing the expression level of 14-3-3θ is protective against rotenone and 1-methyl-4-phenylpyridinium (MPP(+)) in cultured cells. Here, we extend our studies to examine the effects of 14-3-3s in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) mouse model of PD. We first investigated whether targeted nigral 14-3-3θ overexpression mediated by adeno-associated virus offers neuroprotection against MPTP-induced toxicity. 14-3-3θ overexpression using this approach did not reduce MPTP-induced dopaminergic cell loss in the substantia nigra nor the depletion of dopamine (DA) and its metabolites in the striatum at three weeks after MPTP administration. However, 14-3-3θ-overexpressing mice showed a later partial recovery in striatal DA metabolites at eight weeks after MPTP administration compared to controls, suggesting that 14-3-3θ overexpression may help in the functional recovery of those dopaminergic neurons that survive. Conversely, we investigated whether disrupting 14-3-3 function in transgenic mice expressing the pan 14-3-3 inhibitor difopein exacerbates MPTP-induced toxicity. We found that difopein expression promoted dopaminergic cell loss in response to MPTP treatment. Together, these findings suggest that 14-3-3θ overexpression promotes recovery of DA metabolites whereas 14-3-3 inhibition exacerbates neuron loss in the MPTP mouse model of PD.
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Affiliation(s)
- H Ding
- Department of Neurology, Center for Neurodegeneration and Experimental Therapeutics, University of Alabama at Birmingham, USA
| | - R Underwood
- Department of Neurology, Center for Neurodegeneration and Experimental Therapeutics, University of Alabama at Birmingham, USA
| | - N Lavalley
- Department of Neurology, Center for Neurodegeneration and Experimental Therapeutics, University of Alabama at Birmingham, USA
| | - T A Yacoubian
- Department of Neurology, Center for Neurodegeneration and Experimental Therapeutics, University of Alabama at Birmingham, USA.
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152
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Richard P, Qian T, Ding H. ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism. J Phys Condens Matter 2015; 27:293203. [PMID: 26153847 DOI: 10.1088/0953-8984/27/29/293203] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Its direct momentum sensitivity confers to angle-resolved photoemission spectroscopy (ARPES) a unique perspective in investigating the superconducting gap of multi-band systems. In this review we discuss ARPES studies on the superconducting gap of high-temperature Fe-based superconductors. We show that while Fermi-surface-driven pairing mechanisms fail to provide a universal scheme for the Fe-based superconductors, theoretical approaches based on short-range interactions lead to a more robust and universal description of superconductivity in these materials. Our findings are also discussed in the broader context of unconventional superconductivity.
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Affiliation(s)
- P Richard
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. Collaborative Innovation Center of Quantum Matter, Beijing, People's Republic of China
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153
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Rizzi A, Sukhtankar DD, Ding H, Hayashida K, Ruzza C, Guerrini R, Calò G, Ko MC. Spinal antinociceptive effects of the novel NOP receptor agonist PWT2-nociceptin/orphanin FQ in mice and monkeys. Br J Pharmacol 2015; 172:3661-70. [PMID: 25828800 PMCID: PMC4507167 DOI: 10.1111/bph.13150] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 03/18/2015] [Accepted: 03/30/2015] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND AND PURPOSE Using an innovative chemical approach, peptide welding technology (PWT), a tetrabranched derivative of nociceptin/orphanin FQ (N/OFQ) has been generated and pharmacologically characterized. Both in vitro and in vivo PWT2-N/OFQ displayed the same pharmacological profile to the natural ligand. It was more potent and produced longer-lasting effects. The aim of the present study was to investigate the spinal effects of PWT2-N/OFQ in nociceptive and neuropathic pain models in mice and non-human primates. EXPERIMENTAL APPROACH Tail withdrawal assay in mice and monkeys was used as a nociceptive pain model and mechanical threshold in mice subjected to chronic constriction injury was used as a neuropathic pain model. The antinociceptive effects of spinally administered N/OFQ and PWT2-N/OFQ were assessed in these models. KEY RESULTS PWT2-N/OFQ mimicked the spinal antinociceptive effects of N/OFQ both in nociceptive and neuropathic pain models in mice as well as in non-human primates displaying 40-fold higher potency and a markedly prolonged duration of action. The effects of N/OFQ and PWT2-N/OFQ were sensitive to the N/OFQ receptor (NOP) antagonist SB-612111, but not to opioid receptor antagonists. CONCLUSIONS AND IMPLICATIONS The present study has demonstrated that PWT2-N/OFQ mimicked the antinociceptive effects of the natural peptide in rodents and non-human primates acting as a potent and longer-lasting NOP-selective agonist. More generally, PWT derivatives of biologically active peptides can be viewed as innovative pharmacological tools for investigating those conditions and states in which selective and prolonged receptor stimulation promotes beneficial effects.
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Affiliation(s)
- A Rizzi
- Department of Medical Sciences, Section of Pharmacology and National Institute of Neuroscience, University of Ferrara, Ferrara, Italy
| | - D D Sukhtankar
- Department of Anesthesiology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - H Ding
- Department of Anesthesiology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - K Hayashida
- Department of Chemical and Pharmaceutical Sciences and LTTA, University of Ferrara, Ferrara, Italy
| | - C Ruzza
- Department of Medical Sciences, Section of Pharmacology and National Institute of Neuroscience, University of Ferrara, Ferrara, Italy
| | - R Guerrini
- Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
| | - G Calò
- Department of Medical Sciences, Section of Pharmacology and National Institute of Neuroscience, University of Ferrara, Ferrara, Italy
| | - M C Ko
- Department of Anesthesiology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
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154
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Liu T, Zhao Z, Lang Y, Ding H. Profile distribution and accumulation characteristics of organic carbon in a karst hillslope based on particle-size fractionation and stable isotope analysis. J Environ Biol 2015; 36 Spec No:721-726. [PMID: 26387345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Recent studies have highlighted tight coupling between soil aggregate fractions and soil organic carbon (SOC) turnover. However, large uncertainties remain and a mechanistic understanding of geomorphic and land use change effects on carbon storage in soil is still lacking. Taking typical slope of vegetation recovery in karst area as object, the present study analyzed organic carbon content and stable carbon isotope composition (δ13C value) of soil organic matter in bulk and particle size separates of soil on profiles at different topographic positions. The results showed that SOC content decreased gradually in downhill direction. Organic carbon content of sandy soil (50-2000 μm) accounted above 50% in the upper slope positions but in the middle and lower slope soil profiles, organic carbon was mainly stored in silts (2-50 μm) and clays (< 2 μm) which belonged to stable and highly humified SOC. The composition difference of δ13C values in soil profiles reflected the input of plant residues and accumulation characteristics. Organic matter was deposited in different soil particle sizes owing to different degrees of decomposition. Hence, δ13C value can help in identifying the storage and decomposition rates of soil organic matter.
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155
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Ding H, Hayashida K, Suto T, Sukhtankar DD, Kimura M, Mendenhall V, Ko MC. Supraspinal actions of nociceptin/orphanin FQ, morphine and substance P in regulating pain and itch in non-human primates. Br J Pharmacol 2015; 172:3302-12. [PMID: 25752320 PMCID: PMC4500367 DOI: 10.1111/bph.13124] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 02/20/2015] [Accepted: 02/25/2015] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND AND PURPOSE Nociceptin/orphanin FQ (N/OFQ) peptide (NOP) receptor agonists display a promising analgesic profile in preclinical studies. However, supraspinal N/OFQ produced hyperalgesia in rodents and such effects have not been addressed in primates. Thus, the aim of this study was to investigate the effects of centrally administered ligands on regulating pain and itch in non-human primates. In particular, nociceptive thresholds affected by intracisternal N/OFQ were compared with those of morphine and substance P, known to provide analgesia and mediate hyperalgesia, respectively, in humans. EXPERIMENTAL APPROACH Intrathecal catheters were installed to allow intracisternal and lumbar intrathecal administration in awake and unanaesthetized rhesus monkeys. Nociceptive responses were measured using the warm water tail-withdrawal assay. Itch scratching responses were scored from videotapes recording behavioural activities of monkeys in their home cages. Antagonist studies were conducted to validate the receptor mechanisms underlying intracisternally elicited behavioural responses. KEY RESULTS Intracisternal morphine (100 nmol) elicited more head scratches than those after intrathecal morphine. Distinct dermatomal scratching locations between the two routes suggest a corresponding activation of supraspinal and spinal μ receptors. Unlike intracisternal substance P, which induced hyperalgesia, intracisternal N/OFQ (100 nmol) produced antinociceptive effects mediated by NOP receptors. Neither peptide increased scratching responses. CONCLUSIONS AND IMPLICATIONS Taken together, these results demonstrated differential actions of ligands in the primate supraspinal region in regulating pain and itch. This study not only improves scientific understanding of the N/OFQ-NOP receptor system in pain processing but also supports the therapeutic potential of NOP-related ligands as analgesics.
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Affiliation(s)
- H Ding
- Department of Physiology and Pharmacology, Wake Forest University School of MedicineWinston-Salem, NC, USA
| | - K Hayashida
- Department of Anesthesiology, Wake Forest University School of MedicineWinston-Salem, NC, USA
| | - T Suto
- Department of Anesthesiology, Wake Forest University School of MedicineWinston-Salem, NC, USA
| | - D D Sukhtankar
- Department of Physiology and Pharmacology, Wake Forest University School of MedicineWinston-Salem, NC, USA
| | - M Kimura
- Department of Anesthesiology, Wake Forest University School of MedicineWinston-Salem, NC, USA
| | - V Mendenhall
- Preclinical Translational Services, Wake Forest University School of MedicineWinston-Salem, NC, USA
| | - M C Ko
- Department of Physiology and Pharmacology, Wake Forest University School of MedicineWinston-Salem, NC, USA
- Department of Dermatology, Wake Forest University School of MedicineWinston-Salem, NC, USA
- Center for Comparative Medicine Research, Wake Forest University School of MedicineWinston-Salem, NC, USA
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156
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Johnson T, Ding H, Lipinski J, Molloi S. SU-E-I-25: Quantification of Coronary Artery Cross-Sectional Area in CT Angiography Using Integrated Density: A Simulation Study. Med Phys 2015. [DOI: 10.1118/1.4924022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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157
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Ding H, Cho H, Kumar N, Sennung D, Molloi S. SU-D-204-01: Dual-Energy Calibration for Breast Density Measurement Using Spectral Mammography. Med Phys 2015. [DOI: 10.1118/1.4923895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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158
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Cho H, Ding H, Sennung D, Kumar N, Molloi S. TU-CD-207-02: Quantification of Breast Lesion Compositions Using Low-Dose Spectral Mammography: A Feasibility Study. Med Phys 2015. [DOI: 10.1118/1.4925621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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159
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Ding H, Cho H, Kumar N, Sennung D, Ng AL, Molloi S. TU-CD-207-01: Characterization of Breast Tissue Composition Using Spectral Mammography. Med Phys 2015. [DOI: 10.1118/1.4925620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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160
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Kumar N, Ding H, Cho H, Sennung D, Molloi S. SU-D-204-02: Dual-Energy Based Spectral Mammography for Characterization of Breast Lesion Composition: A Postmortem Study. Med Phys 2015. [DOI: 10.1118/1.4923896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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161
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Johnson T, Ding H, Torabzadeh M, Molloi S. SU-C-207-07: Quantification of Coronary Artery Cross-Sectional Area in CT Angiography Using Integrated Density: A Phantom Study. Med Phys 2015. [DOI: 10.1118/1.4923838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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162
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163
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Liu X, Dean MPM, Liu J, Chiuzbăian SG, Jaouen N, Nicolaou A, Yin WG, Rayan Serrao C, Ramesh R, Ding H, Hill JP. Probing single magnon excitations in Sr₂IrO₄ using O K-edge resonant inelastic x-ray scattering. J Phys Condens Matter 2015; 27:202202. [PMID: 25921058 DOI: 10.1088/0953-8984/27/20/202202] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Resonant inelastic x-ray scattering (RIXS) at the L-edge of transition metal elements is now commonly used to probe single magnon excitations. Here we show that single magnon excitations can also be measured with RIXS at the K-edge of the surrounding ligand atoms when the center heavy metal elements have strong spin-orbit coupling. This is demonstrated with oxygen K-edge RIXS experiments on the perovskite Sr2IrO4, where low energy peaks from single magnon excitations were observed. This new application of RIXS has excellent potential to be applied to a wide range of magnetic systems based on heavy elements, for which the L-edge RIXS energy resolution in the hard x-ray region is usually poor.
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Affiliation(s)
- X Liu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973, USA. Collaborative Innovation Center of Quantum Matter, Beijing, People's Republic of China
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164
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Xia W, Ye X, Xu X, Ding H, Liu J, Deng J, Chen Y, Shao Y, Wang J, Li H, Fu Y, Santoso S. Two cases of platelet transfusion refractoriness and one case of possible FNAIT caused by antibodies against CD36 in China. Transfus Med 2015; 24:254-6. [PMID: 25124074 DOI: 10.1111/tme.12137] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Revised: 06/19/2014] [Accepted: 06/26/2014] [Indexed: 11/30/2022]
Affiliation(s)
- W Xia
- Institute of Blood Transfusion, Guangzhou Blood Center
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165
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Bao F, Wang Y, Liu J, Mao C, Ma S, Guo C, Ding H, Zhang M. Structural changes in the CNS of patients with hemifacial spasm. Neuroscience 2015; 289:56-62. [DOI: 10.1016/j.neuroscience.2014.12.070] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 11/26/2014] [Accepted: 12/23/2014] [Indexed: 12/20/2022]
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166
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Liu L, Hou S, Lin M, Song M, Chen L, Li M, Jin H, Zhou J, Li X, Davis G, Ding H, Tseng H. A Pilot Study of NIPS-24 Using Circulating Fetal Nucleated Cells (CFNCs) Isolated with Nanovelcro Microchips. Fertil Steril 2015. [DOI: 10.1016/j.fertnstert.2014.12.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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167
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Wang N, Ding H, Liu C, Li X, Wei L, Yu J, Liu M, Ying M, Gao W, Jiang H, Wang Y. A novel recurrent CHEK2 Y390C mutation identified in high-risk Chinese breast cancer patients impairs its activity and is associated with increased breast cancer risk. Oncogene 2015; 34:5198-205. [PMID: 25619829 DOI: 10.1038/onc.2014.443] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2014] [Revised: 10/31/2014] [Accepted: 11/21/2014] [Indexed: 02/07/2023]
Abstract
Certain predisposition factors such as BRCA1/2 and CHEK2 mutations cause familial breast cancers that occur early. In China, breast cancers are diagnosed at relatively younger age, and higher percentage of patients are diagnosed before 40 years, than that in Caucasians. However, the prevalence for BRCA1/2 mutations and reported CHEK2 germline mutations is much lower or absent in Chinese population, arguing for the need to study other novel risk alleles among Chinese breast cancer patients. In this study, we searched for CHEK2 mutations in young, high-risk breast cancer patients in China and detected a missense variant Y390C (1169A > G) in 12 of 150 patients (8.0%) and 2 in 250 healthy controls (0.8%, P = 0.0002). Four of the Y390C carriers have family history of breast and/or ovarian cancer. In patients without family history, Y390C carriers tend to develop breast cancer early, before 35 years of age. The codon change at Y390, a highly conserved residue located in CHEK2's kinase domain, appeared to significantly impair CHEK2 activity. Functional analysis suggested that the CHEK2 Y390C mutation is deleterious as judged by the mutant protein's inability to inactivate CDC25A or to activate p53 after DNA damage. Cells expressing the CHEK2 Y390C variant showed impaired p21 and Puma expression after DNA damage, and the deregulated cell cycle checkpoint and apoptotic response may help conserve mutations and therefore contribute to tumorigeneisis. Taken together, our results not only identified a novel CHEK2 allele that is associated with cancer families and confers increased breast cancer risk, but also showed that this allele significantly impairs CHEK2 function during DNA damage response. Our results provide further insight on how the function of such an important cancer gene may be impaired by existing mutations to facilitate tumorigenesis. It also offers a new subject for breast cancer monitoring, prevention and management.
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Affiliation(s)
- N Wang
- Department of Oncology, Changhai Hospital, the Second Military Medical University, Shanghai, China
| | - H Ding
- Key Laboratory of Systems Biology, State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - C Liu
- Department of Oncology, Changhai Hospital, the Second Military Medical University, Shanghai, China.,Key Laboratory of Systems Biology, State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - X Li
- Key Laboratory of Systems Biology, State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - L Wei
- Department of Oncology, Changhai Hospital, the Second Military Medical University, Shanghai, China.,Department of Oncology, the 401 hospital of PLA, Qingdao, China
| | - J Yu
- Key Laboratory of Systems Biology, State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - M Liu
- Key Laboratory of Systems Biology, State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - M Ying
- Department of Oncology, Changhai Hospital, the Second Military Medical University, Shanghai, China
| | - W Gao
- Department of Oncology, Changhai Hospital, the Second Military Medical University, Shanghai, China
| | - H Jiang
- Key Laboratory of Systems Biology, State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Y Wang
- Department of Oncology, Changhai Hospital, the Second Military Medical University, Shanghai, China.,Xinhua Cancer Center, Xinhua Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China
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168
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Miao H, Qian T, Shi X, Richard P, Kim TK, Hoesch M, Xing LY, Wang XC, Jin CQ, Hu JP, Ding H. Observation of strong electron pairing on bands without Fermi surfaces in LiFe1−xCoxAs. Nat Commun 2015; 6:6056. [PMID: 25583450 DOI: 10.1038/ncomms7056] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2014] [Accepted: 12/09/2014] [Indexed: 11/10/2022] Open
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169
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Li J, Li J, Huang H, Zhu X, Ding H, Huang C, Lin J, Huang J, Wu Z, Ashraf M, Wang Y, Li X, Zheng S, Chen J, Guo H, Zhuang J, Zhu P. Influence of sirolimus-induced TGF-β secretion on mouse Treg cell proliferation. Genet Mol Res 2015; 14:18569-79. [DOI: 10.4238/2015.december.28.4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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170
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Ma JZ, van Roekeghem A, Richard P, Liu ZH, Miao H, Zeng LK, Xu N, Shi M, Cao C, He JB, Chen GF, Sun YL, Cao GH, Wang SC, Biermann S, Qian T, Ding H. Correlation-induced self-doping in the iron-pnictide superconductor Ba2Ti2Fe2As4O. Phys Rev Lett 2014; 113:266407. [PMID: 25615365 DOI: 10.1103/physrevlett.113.266407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Indexed: 06/04/2023]
Abstract
The electronic structure of the iron-based superconductor Ba2Ti2Fe2As4O (Tc(onset)=23.5 K) has been investigated by using angle-resolved photoemission spectroscopy and combined local density approximation and dynamical mean field theory calculations. The electronic states near the Fermi level are dominated by both the Fe 3d and Ti 3d orbitals, indicating that the spacer layers separating different FeAs layers are also metallic. By counting the enclosed volumes of the Fermi surface sheets, we observe a large self-doping effect; i.e., 0.25 electrons per unit cell are transferred from the FeAs layer to the Ti2As2O layer, leaving the FeAs layer in a hole-doped state. This exotic behavior is successfully reproduced by our dynamical mean field calculations, in which the self-doping effect is attributed to the electronic correlations in the 3d shells. Our work provides an alternative route of effective doping without element substitution for iron-based superconductors.
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Affiliation(s)
- J-Z Ma
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - A van Roekeghem
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China and Centre de Physique Théorique, Ecole Polytechnique, CNRS-UMR7644, 91128 Palaiseau, France
| | - P Richard
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China and Collaborative Innovation Center of Quantum Matter, Beijing, China
| | - Z-H Liu
- Department of Physics, Renmin University, Beijing 100872, China
| | - H Miao
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - L-K Zeng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - N Xu
- Paul Scherrer Institute, Swiss Light Source, CH-5232 Villigen PSI, Switzerland
| | - M Shi
- Paul Scherrer Institute, Swiss Light Source, CH-5232 Villigen PSI, Switzerland
| | - C Cao
- Department of Physics, Condensed Matter Physics Group, Hangzhou Normal University, Hangzhou 310036, China
| | - J-B He
- Department of Physics, Renmin University, Beijing 100872, China
| | - G-F Chen
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China and Collaborative Innovation Center of Quantum Matter, Beijing, China and Department of Physics, Renmin University, Beijing 100872, China
| | - Y-L Sun
- Department of Physics, Zhejiang University, Hangzhou 310027, China
| | - G-H Cao
- Department of Physics, Zhejiang University, Hangzhou 310027, China
| | - S-C Wang
- Department of Physics, Renmin University, Beijing 100872, China
| | - S Biermann
- Centre de Physique Théorique, Ecole Polytechnique, CNRS-UMR7644, 91128 Palaiseau, France and Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France and European Theoretical Synchrotron Facility (ETSF), Europe
| | - T Qian
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - H Ding
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China and Collaborative Innovation Center of Quantum Matter, Beijing, China
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171
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Cho HM, Ding H, Ziemer BP, Molloi S. Energy response calibration of photon-counting detectors using x-ray fluorescence: a feasibility study. Phys Med Biol 2014; 59:7211-27. [PMID: 25369288 DOI: 10.1088/0031-9155/59/23/7211] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Accurate energy calibration is critical for the application of energy-resolved photon-counting detectors in spectral imaging. The aim of this study is to investigate the feasibility of energy response calibration and characterization of a photon-counting detector using x-ray fluorescence. A comprehensive Monte Carlo simulation study was performed using Geant4 Application for Tomographic Emission (GATE) to investigate the optimal technique for x-ray fluorescence calibration. Simulations were conducted using a 100 kVp tungsten-anode spectra with 2.7 mm Al filter for a single pixel cadmium telluride (CdTe) detector with 3 × 3 mm(2) in detection area. The angular dependence of x-ray fluorescence and scatter background was investigated by varying the detection angle from 20° to 170° with respect to the beam direction. The effects of the detector material, shape, and size on the recorded x-ray fluorescence were investigated. The fluorescent material size effect was considered with and without the container for the fluorescent material. In order to provide validation for the simulation result, the angular dependence of x-ray fluorescence from five fluorescent materials was experimentally measured using a spectrometer. Finally, eleven of the fluorescent materials were used for energy calibration of a CZT-based photon-counting detector. The optimal detection angle was determined to be approximately at 120° with respect to the beam direction, which showed the highest fluorescence to scatter ratio (FSR) with a weak dependence on the fluorescent material size. The feasibility of x-ray fluorescence for energy calibration of photon-counting detectors in the diagnostic x-ray energy range was verified by successfully calibrating the energy response of a CZT-based photon-counting detector. The results of this study can be used as a guideline to implement the x-ray fluorescence calibration method for photon-counting detectors in a typical imaging laboratory.
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Affiliation(s)
- H-M Cho
- Department of Radiological Sciences, University of California, Medical Sciences I, B-140, Irvine, CA 92697, USA
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Ding H, Hong C, Wang Y, Liu J, Zhang N, Shen C, Wei W, Zheng F. Calreticulin promotes angiogenesis via activating nitric oxide signalling pathway in rheumatoid arthritis. Clin Exp Immunol 2014; 178:236-44. [PMID: 24988887 DOI: 10.1111/cei.12411] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/30/2014] [Indexed: 12/29/2022] Open
Abstract
Calreticulin (CRT) is a multi-functional endoplasmic reticulum protein implicated in the pathogenesis of rheumatoid arthritis (RA). The present study was undertaken to determine whether CRT was involved in angiogenesis via the activating nitric oxide (NO) signalling pathway. We explored the profile of CRT expression in RA (including serum, synovial fluid and synovial tissue). In order to investigate the role of CRT on angiogenesis, human umbilical vein endothelial cells (HUVECs) were isolated and cultured in this study for in-vitro experiments. Our results showed a significantly higher concentration of CRT in serum (5·4 ± 2·2 ng/ml) of RA patients compared to that of osteoarthritis (OA, 3·6 ± 0·9 ng/ml, P < 0·05) and healthy controls (HC, 3·7 ± 0·6 ng/ml, P < 0·05); and significantly higher CRT in synovial fluid (5·8 ± 1·2 ng/ml) of RA versus OA (3·7 ± 0·3 ng/ml, P < 0·05). High levels of CRT are expressed in synovial membrane localized predominantly to inflammatory cells and synovial perivascular areas in both the lining and sublining layers of RA synovial tissue (RAST). Increased nitric oxide (NO) production and phosphorylation level of endothelial nitric oxide synthase (eNOS) were measured in HUVECs following CRT stimulation, while the total eNOS expression was not significantly changed. Furthermore, CRT promoted the proliferation, migration and tube formation of HUVECs, which were significantly inhibited by a specific eNOS inhibitor. These findings suggested that CRT may be involved in angiogenesis events in RA through NO signalling pathways, which may provide a potential therapeutic target in the treatment of RA.
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Affiliation(s)
- H Ding
- Department of Immunology, School of Laboratory Medicine, Tianjin Medical University, Tianjin, China; The Second Hospital of Tangshan, Tangshan, China
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173
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Qiao Y, Peng Q, Yan J, Wang H, Ding H, Shi B. Gene cloning and enzymatic characterization of alkali-tolerant type I pullulanase from Exiguobacterium acetylicum. Lett Appl Microbiol 2014; 60:52-9. [DOI: 10.1111/lam.12333] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 09/26/2014] [Accepted: 09/29/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Y. Qiao
- Feed Research Institute; Chinese Academy of Agricultural Sciences; Beijing China
| | - Q. Peng
- Feed Research Institute; Chinese Academy of Agricultural Sciences; Beijing China
| | - J. Yan
- Feed Research Institute; Chinese Academy of Agricultural Sciences; Beijing China
| | - H. Wang
- Feed Research Institute; Chinese Academy of Agricultural Sciences; Beijing China
| | - H. Ding
- Feed Research Institute; Chinese Academy of Agricultural Sciences; Beijing China
| | - B. Shi
- Feed Research Institute; Chinese Academy of Agricultural Sciences; Beijing China
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174
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Dong Y, Wang WP, Gan YH, Huang BJ, Ding H. Radiofrequency ablation guided by contrast-enhanced ultrasound for hepatic malignancies: Preliminary results. Clin Radiol 2014; 69:1129-35. [DOI: 10.1016/j.crad.2014.06.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Revised: 06/06/2014] [Accepted: 06/16/2014] [Indexed: 01/07/2023]
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175
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Zhang H, Yue L, Chen Y, Ding H, Zhao K, Montgomery W. Medication Usage Pattern, Health Resource Utilization and Economic Burden for Patients with Mdd in Beijing, China. Value Health 2014; 17:A457. [PMID: 27201275 DOI: 10.1016/j.jval.2014.08.1256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- H Zhang
- Lilly Suzhou Pharmaceutical Company, Ltd., Shanghai, China
| | - L Yue
- Lilly Suzhou Pharmaceutical Company, Ltd., Shanghai, China
| | - Y Chen
- Lilly Suzhou Pharmaceutical Company, Ltd., Shanghai, China
| | - H Ding
- Dalian Medical University, Dalian, China
| | - K Zhao
- Beijing Brainpower Pharma Consulting Co. Ltd., Beijing, China
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176
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Xing LY, Miao H, Wang XC, Ma J, Liu QQ, Deng Z, Ding H, Jin CQ. The anomaly Cu doping effects on LiFeAs superconductors. J Phys Condens Matter 2014; 26:435703. [PMID: 25299428 DOI: 10.1088/0953-8984/26/43/435703] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The Cu substitution effect on the superconductivity of LiFeAs has been studied in comparison with Co/Ni substitution. It is found that the shrinking rate of the lattice parameter c for Cu substitution is much smaller than that of Co/Ni substitution. This is in conjugation with the observation of ARPES that shows almost the same electron and hole Fermi surfaces (FSs) size for undoped and Cu substituted LiFeAs sample, except for a very small hole band sinking below Fermi level with doping. This indicates that there is little doping effect at Fermi surface by Cu substitution, in sharp contrast to the more effective carrier doping effect by Ni or Co.
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Affiliation(s)
- L Y Xing
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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177
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Fritz AJ, Stojkovic B, Ding H, Xu J, Bhattacharya S, Berezney R. Cell type specific alterations in interchromosomal networks across the cell cycle. PLoS Comput Biol 2014; 10:e1003857. [PMID: 25275626 PMCID: PMC4183423 DOI: 10.1371/journal.pcbi.1003857] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Accepted: 08/16/2014] [Indexed: 11/18/2022] Open
Abstract
The interchromosomal organization of a subset of human chromosomes (#1, 4, 11, 12, 16, 17, and 18) was examined in G1 and S phase of human WI38 lung fibroblast and MCF10A breast epithelial cells. Radial positioning of the chromosome territories (CTs) was independent of gene density, but size dependent. While no changes in radial positioning during the cell cycle were detected, there were stage-specific differences between cell types. Each CT was in close proximity (interaction) with a similar number of other CT except the gene rich CT17 which had significantly more interactions. Furthermore, CT17 was a member of the highest pairwise CT combinations with multiple interactions. Major differences were detected in the pairwise interaction profiles of MCF10A versus WI38 including cell cycle alterations from G1 to S. These alterations in interaction profiles were subdivided into five types: overall increase, overall decrease, switching from 1 to ≥2 interactions, vice versa, or no change. A global data mining program termed the chromatic median determined the most probable overall association network for the entire subset of CT. This probabilistic interchromosomal network was nearly completely different between the two cell lines. It was also strikingly altered across the cell cycle in MCF10A, but only slightly in WI38. We conclude that CT undergo multiple and preferred interactions with other CT in the nucleus and form preferred -albeit probabilistic- interchromosomal networks. This network of interactions is altered across the cell cycle and between cell types. It is intriguing to consider the relationship of these alterations to the corresponding changes in the gene expression program across the cell cycle and in different cell types.
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Affiliation(s)
- Andrew J Fritz
- Department of Biological Sciences, University at Buffalo, State University of New York, Buffalo, New York, United States of America
| | - Branislav Stojkovic
- Department of Computer Science and Engineering, University at Buffalo, State University of New York, Buffalo, New York, United States of America
| | - Hu Ding
- Department of Computer Science and Engineering, University at Buffalo, State University of New York, Buffalo, New York, United States of America
| | - Jinhui Xu
- Department of Computer Science and Engineering, University at Buffalo, State University of New York, Buffalo, New York, United States of America
| | - Sambit Bhattacharya
- Department of Computer Sciences, Fayetteville State University, Fayetteville, North Carolina, United States of America
| | - Ronald Berezney
- Department of Biological Sciences, University at Buffalo, State University of New York, Buffalo, New York, United States of America
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Cui G, Li Z, Li R, Huang J, Wang H, Zhang L, Ding H, Wang DW. A functional variant in APOA5/A4/C3/A1 gene cluster contributes to elevated triglycerides and severity of CAD by interfering with microRNA 3201 binding efficiency. J Am Coll Cardiol 2014; 64:267-77. [PMID: 25034063 DOI: 10.1016/j.jacc.2014.03.050] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 03/08/2014] [Accepted: 03/15/2014] [Indexed: 12/22/2022]
Abstract
BACKGROUND Recent genome-wide association studies identified the APOA5/A4/C3/A1 gene cluster polymorphisms influencing triglyceride level and risk of coronary artery disease (CAD). OBJECTIVES The purposes of this study were to fine-map triglyceride association signals in the APOA5/A4/C3/A1 gene cluster and then explore the clinical relevance in CAD and potential underlying mechanisms. METHODS We resequenced the APOA5/A4/C3/A1 gene cluster in 200 patients with extremely high triglyceride levels (≥10 mm/l) and 200 healthy control subjects who were ethnically matched and genotyped 20 genetic markers among 4,991 participants with Chinese Han ethnicity. Subsequently, 8 risk markers were investigated in 917 early-onset and 1,149 late-onset CAD patients, respectively. The molecular mechanism was explored. RESULTS By resequencing, a number of newly and potentially functional variants were identified, and both the common and rare variants have remarkable cumulative effects on hypertriglyceridemia risk. Of note, gene dosage of rs2266788 demonstrated a robust association with triglyceride level (p = 1.39 × 10(-19)), modified Gensini scores (p = 1.67 × 10(-3)), and numbers of vascular lesions in CAD patients (odds ratio: 1.96, 95% confidence interval: 1.31 to 2.14, p = 8.96 × 10(-4)). Functional study demonstrated that the rs2266788 C allele destroyed microRNA 3201 binding to the 3' UTR of APOA5, resulting in prolonging the half-life of APOA5 messenger RNA and increasing its expression levels. CONCLUSIONS Genetic variants in APOA5/A4/C3/A1 gene cluster play an important role in the regulation of plasma triglyceride levels by an increased APOA5 concentration and contribute to the severity of CAD.
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Affiliation(s)
- Guanglin Cui
- Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Zongzhe Li
- Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Rui Li
- Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Jin Huang
- Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Haoran Wang
- Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Lina Zhang
- Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Hu Ding
- Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China.
| | - Dao Wen Wang
- Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China.
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180
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Ding H, Pinel S, Jouan-Hureaux V, Chateau A, Boura C, Faivre B. P01.07 * IMPACT OF EXTRACELLULAR VESICLES RELEASED BY GLIOBLASTOMA CELLS AFTER IRRADIATION ON TUMOR MICROENVIRONMENT. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou174.100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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181
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Wang J, Wang Y, Zou Y, Sun K, Wang Z, Ding H, Yuan J, Wei W, Hou Q, Wang H, Liu X, Zhang H, Ji Y, Zhou X, Sharma RK, Wang D, Ahmad F, Hui R, Song L. Malignant effects of multiple rare variants in sarcomere genes on the prognosis of patients with hypertrophic cardiomyopathy. Eur J Heart Fail 2014; 16:950-7. [PMID: 25132132 DOI: 10.1002/ejhf.144] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 06/13/2014] [Indexed: 11/06/2022] Open
Abstract
AIMS Although genetic testing has been recommended in patients with hypertrophic cardiomyopathy (HCM) in current clinical practice, its utility in prognostic prediction remains to be ascertained. We assessed the dosage effect of rare variants in sarcomere genes on the long-term outcomes of HCM. METHODS AND RESULTS A total of 529 unrelated HCM patients were prospectively recruited and followed for 4.7 ± 3.2 years. Eight sarcomere genes were screened with targeted resequencing and identified variants were validated through Sanger sequencing. After polymorphisms and likely neutral rare variants were excluded, the patients were segregated into three groups based on the dosage of rare variants: no rare variant, a single rare variant, and multiple rare variants. Multiple rare variants were identified in 7.2% (38/529) of the study patients. Patients with multiple rare variants were younger at diagnosis, and had greater maximum LV wall thicknesses and larger left atria. The risk for cardiovascular death in patients with multiple rare variants was higher than in those without rare variants (P =10⁻⁵) or in those with a single rare variant (P = 2 × 10⁻⁵). Multivariable analysis revealed that multiple rare variants were a risk factor for cardiovascular death [hazard ratio (HR) 3.74, 95% confidence interval (CI) 1.84-7.58, P = 0.0003], as well as sudden cardiac death (HR 3.57, 95% CI 1.23-10.35, P = 0.019) and heart failure-related death (HR 4.62, 95% CI 1.67-12.76, P = 0.003). CONCLUSIONS The presence of multiple rare variants in sarcomere genes is a risk factor for malignant outcomes in HCM, and may be appropriate to consider as a criterion in the risk stratification of HCM patients.
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Affiliation(s)
- Jizheng Wang
- State Key Laboratory of Cardiovascular Diseases, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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182
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Xu N, Biswas PK, Dil JH, Dhaka RS, Landolt G, Muff S, Matt CE, Shi X, Plumb NC, Radović M, Pomjakushina E, Conder K, Amato A, Borisenko SV, Yu R, Weng HM, Fang Z, Dai X, Mesot J, Ding H, Shi M. Direct observation of the spin texture in SmB6 as evidence of the topological Kondo insulator. Nat Commun 2014; 5:4566. [PMID: 25074332 DOI: 10.1038/ncomms5566] [Citation(s) in RCA: 175] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Accepted: 07/01/2014] [Indexed: 11/09/2022] Open
Abstract
Topological Kondo insulators have been proposed as a new class of topological insulators in which non-trivial surface states reside in the bulk Kondo band gap at low temperature due to strong spin-orbit coupling. In contrast to other three-dimensional topological insulators, a topological Kondo insulator is truly bulk insulating. Furthermore, strong electron correlations are present in the system, which may interact with the novel topological phase. By applying spin- and angle-resolved photoemission spectroscopy, here we show that the surface states of SmB6 are spin polarized. The spin is locked to the crystal momentum, fulfilling time reversal and crystal symmetries. Our results provide strong evidence that SmB6 can host topological surface states in a bulk insulating gap stemming from the Kondo effect, which can serve as an ideal platform for investigating of the interplay between novel topological quantum states with emergent effects and competing orders induced by strongly correlated electrons.
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Affiliation(s)
- N Xu
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - P K Biswas
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - J H Dil
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - R S Dhaka
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - G Landolt
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Physik-Institut, Universität Zürich, Winterthurerstrauss 190, CH-8057 Zürich, Switzerland
| | - S Muff
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - C E Matt
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Laboratory for Solid State Physics, ETH Zürich, CH-8093, Zürich, Switzerland
| | - X Shi
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - N C Plumb
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - M Radović
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] SwissFEL, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - E Pomjakushina
- Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - K Conder
- Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - A Amato
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - S V Borisenko
- Institute for Solid State Research, IFW Dresden, PO Box 270116, D-01171 Dresden, Germany
| | - R Yu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - H-M Weng
- 1] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - Z Fang
- 1] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - X Dai
- 1] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - J Mesot
- 1] Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland [2] Institute of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland [3] Laboratory for Solid State Physics, ETH Zürich, CH-8093, Zürich, Switzerland
| | - H Ding
- 1] Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
| | - M Shi
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
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183
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Katich J, Qian X, Zhao YX, Allada K, Aniol K, Annand JRM, Averett T, Benmokhtar F, Bertozzi W, Bradshaw PC, Bosted P, Camsonne A, Canan M, Cates GD, Chen C, Chen JP, Chen W, Chirapatpimol K, Chudakov E, Cisbani E, Cornejo JC, Cusanno F, Dalton MM, Deconinck W, de Jager CW, De Leo R, Deng X, Deur A, Ding H, Dolph PAM, Dutta C, Dutta D, El Fassi L, Frullani S, Gao H, Garibaldi F, Gaskell D, Gilad S, Gilman R, Glamazdin O, Golge S, Guo L, Hamilton D, Hansen O, Higinbotham DW, Holmstrom T, Huang J, Huang M, Ibrahim HF, Iodice M, Jiang X, Jin G, Jones MK, Kelleher A, Kim W, Kolarkar A, Korsch W, LeRose JJ, Li X, Li Y, Lindgren R, Liyanage N, Long E, Lu HJ, Margaziotis DJ, Markowitz P, Marrone S, McNulty D, Meziani ZE, Michaels R, Moffit B, Muñoz Camacho C, Nanda S, Narayan A, Nelyubin V, Norum B, Oh Y, Osipenko M, Parno D, Peng JC, Phillips SK, Posik M, Puckett AJR, Qiang Y, Rakhman A, Ransome RD, Riordan S, Saha A, Sawatzky B, Schulte E, Shahinyan A, Shabestari MH, Širca S, Stepanyan S, Subedi R, Sulkosky V, Tang LG, Tobias A, Urciuoli GM, Vilardi I, Wang K, Wang Y, Wojtsekhowski B, Yan X, Yao H, Ye Y, Ye Z, Yuan L, Zhan X, Zhang Y, Zhang YW, Zhao B, Zheng X, Zhu L, Zhu X, Zong X. Measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the reaction (3)He(↑)(e,e')X. Phys Rev Lett 2014; 113:022502. [PMID: 25062169 DOI: 10.1103/physrevlett.113.022502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Indexed: 06/03/2023]
Abstract
We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction 3)He(↑)(e,e')X on a polarized (3)He gas target. Assuming time-reversal invariance, this asymmetry is strictly zero in the Born approximation but can be nonzero if two-photon-exchange contributions are included. The experiment, conducted at Jefferson Lab using a 5.89 GeV electron beam, covers a range of 1.7<W<2.9 GeV, 1.0<Q(2)<4.0 GeV(2) and 0.16<x<0.65. Neutron asymmetries were extracted using the effective nucleon polarization and measured proton-to-(3)He cross-section ratios. The measured neutron asymmetries are negative with an average value of (-1.09±0.38)×10(-2) for invariant mass W>2 GeV, which is nonzero at the 2.89σ level. Our measured asymmetry agrees both in sign and magnitude with a two-photon-exchange model prediction that uses input from the Sivers transverse momentum distribution obtained from semi-inclusive deep-inelastic scattering.
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Affiliation(s)
- J Katich
- College of William and Mary, Williamsburg, Virginia 23187, USA and University of Colorado, Boulder, Colorado 80309, USA
| | - X Qian
- Duke University, Durham, North Carolina 27708, USA and Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125, USA and Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Y X Zhao
- University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - K Allada
- University of Kentucky, Lexington, Kentucky 40506, USA
| | - K Aniol
- California State University, Los Angeles, Los Angeles, California 90032, USA
| | - J R M Annand
- University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
| | - T Averett
- College of William and Mary, Williamsburg, Virginia 23187, USA
| | - F Benmokhtar
- Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
| | - W Bertozzi
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - P C Bradshaw
- College of William and Mary, Williamsburg, Virginia 23187, USA
| | - P Bosted
- College of William and Mary, Williamsburg, Virginia 23187, USA
| | - A Camsonne
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - M Canan
- Old Dominion University, Norfolk, Virginia 23529, USA
| | - G D Cates
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - C Chen
- Hampton University, Hampton, Virginia 23187, USA
| | - J-P Chen
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - W Chen
- Duke University, Durham, North Carolina 27708, USA
| | - K Chirapatpimol
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - E Chudakov
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - E Cisbani
- INFN, Sezione di Roma, I-00161 Rome, Italy and Istituto Superiore di Sanità, I-00161 Rome, Italy
| | - J C Cornejo
- California State University, Los Angeles, Los Angeles, California 90032, USA
| | - F Cusanno
- INFN, Sezione di Roma, I-00161 Rome, Italy and Istituto Superiore di Sanità, I-00161 Rome, Italy
| | - M M Dalton
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - W Deconinck
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - C W de Jager
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and University of Virginia, Charlottesville, Virginia 22904, USA
| | - R De Leo
- INFN, Sezione di Bari and University of Bari, I-70126 Bari, Italy
| | - X Deng
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - A Deur
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - H Ding
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - P A M Dolph
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - C Dutta
- University of Kentucky, Lexington, Kentucky 40506, USA
| | - D Dutta
- Mississippi State University, Mississippi State, Minnesota 39762, USA
| | - L El Fassi
- Old Dominion University, Norfolk, Virginia 23529, USA and Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
| | - S Frullani
- INFN, Sezione di Roma, I-00161 Rome, Italy and Istituto Superiore di Sanità, I-00161 Rome, Italy
| | - H Gao
- Duke University, Durham, North Carolina 27708, USA
| | - F Garibaldi
- INFN, Sezione di Roma, I-00161 Rome, Italy and Istituto Superiore di Sanità, I-00161 Rome, Italy
| | - D Gaskell
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - S Gilad
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - R Gilman
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
| | - O Glamazdin
- Kharkov Institute of Physics and Technology, Kharkov 61108, Ukraine
| | - S Golge
- Old Dominion University, Norfolk, Virginia 23529, USA
| | - L Guo
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - D Hamilton
- University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom
| | - O Hansen
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - D W Higinbotham
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - T Holmstrom
- Longwood University, Farmville, Virginia 23909, USA
| | - J Huang
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - M Huang
- Duke University, Durham, North Carolina 27708, USA
| | | | - M Iodice
- INFN, Sezione di Roma3, I-00146 Rome, Italy
| | - X Jiang
- Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA and Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - G Jin
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - M K Jones
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Kelleher
- College of William and Mary, Williamsburg, Virginia 23187, USA
| | - W Kim
- Kyungpook National University, Taegu 702-701, Republic of Korea
| | - A Kolarkar
- University of Kentucky, Lexington, Kentucky 40506, USA
| | - W Korsch
- University of Kentucky, Lexington, Kentucky 40506, USA
| | - J J LeRose
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - X Li
- China Institute of Atomic Energy, Beijing, People's Republic of China
| | - Y Li
- China Institute of Atomic Energy, Beijing, People's Republic of China
| | - R Lindgren
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - N Liyanage
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - E Long
- University of New Hampshire, Durham, New Hampshire 03824, USA
| | - H-J Lu
- University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - D J Margaziotis
- California State University, Los Angeles, Los Angeles, California 90032, USA
| | - P Markowitz
- Florida International University, Miami, Florida 33199, USA
| | - S Marrone
- INFN, Sezione di Bari and University of Bari, I-70126 Bari, Italy
| | - D McNulty
- University of Massachusetts, Amherst, Massachusetts 01003, USA
| | - Z-E Meziani
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - R Michaels
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - B Moffit
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA and Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | | | - S Nanda
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Narayan
- Mississippi State University, Mississippi State, Minnesota 39762, USA
| | - V Nelyubin
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - B Norum
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - Y Oh
- Seoul National University, Seoul, 151-747, Republic of Korea
| | - M Osipenko
- INFN, Sezione di Genova, I-16146 Genova, Italy
| | - D Parno
- Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
| | - J C Peng
- University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - S K Phillips
- University of New Hampshire, Durham, New Hampshire 03824, USA
| | - M Posik
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - A J R Puckett
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA and Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Y Qiang
- Duke University, Durham, North Carolina 27708, USA and Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - A Rakhman
- Syracuse University, Syracuse, New York 13244, USA
| | - R D Ransome
- Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
| | - S Riordan
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - A Saha
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - B Sawatzky
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Temple University, Philadelphia, Pennsylvania 19122, USA
| | - E Schulte
- Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
| | - A Shahinyan
- Yerevan Physics Institute, Yerevan 375036, Armenia
| | - M H Shabestari
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - S Širca
- University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - S Stepanyan
- Kyungpook National University, Daegu 702-701, Republic of Korea
| | - R Subedi
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - V Sulkosky
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA and Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - L-G Tang
- Hampton University, Hampton, Virginia 23187, USA
| | - A Tobias
- University of Virginia, Charlottesville, Virginia 22904, USA
| | | | - I Vilardi
- INFN, Sezione di Bari and University of Bari, I-70126 Bari, Italy
| | - K Wang
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - Y Wang
- University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - B Wojtsekhowski
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
| | - X Yan
- University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - H Yao
- Temple University, Philadelphia, Pennsylvania 19122, USA
| | - Y Ye
- University of Science and Technology of China, Hefei 230026, People's Republic of China
| | - Z Ye
- Hampton University, Hampton, Virginia 23187, USA
| | - L Yuan
- Hampton University, Hampton, Virginia 23187, USA
| | - X Zhan
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Y Zhang
- Lanzhou University, Lanzhou 730000, Gansu, People's Republic of China
| | - Y-W Zhang
- Lanzhou University, Lanzhou 730000, Gansu, People's Republic of China
| | - B Zhao
- College of William and Mary, Williamsburg, Virginia 23187, USA
| | - X Zheng
- University of Virginia, Charlottesville, Virginia 22904, USA
| | - L Zhu
- Hampton University, Hampton, Virginia 23187, USA and University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - X Zhu
- Duke University, Durham, North Carolina 27708, USA
| | - X Zong
- Duke University, Durham, North Carolina 27708, USA
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184
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Liu W, Wang B, Ding H, Wang DW, Zeng H. A potential therapeutic effect of CYP2C8 overexpression on anti-TNF-α activity. Int J Mol Med 2014; 34:725-32. [PMID: 25017038 PMCID: PMC4121355 DOI: 10.3892/ijmm.2014.1844] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Accepted: 07/01/2014] [Indexed: 02/07/2023] Open
Abstract
Epoxyeicosatrienoic acids (EETs) are generated from arachidonic acid catalysed by cytochrome P450 (CYP) epoxygenases. In addition to regulating vascular tone EETs may alleviate inflammation and ROS. The present study was conducted to determine whether CYP2C8 gene overexpression was able to increase the level of EETs, and subsequently prevent TNF-α induced inflammation and reactive oxygen species (ROS) in human umbilical vein endothelial cells (HUVECs) and macrophages. Peroxisome proliferator-activated receptor γ (PPARγ) activation, nuclear factor-κB (NF-κB) activation, endothelial nitric oxide synthase (eNOS) activation, gp-91 activation, and inflammatory cytokine expression were detected by western blot analysis or enzyme-linked immunosorbent assay. Intracellular reactive oxygen species (ROS) was measured by flow cytometry, while the migration of vascular smooth muscle cells (VSMCs) was detected by Transwell assay. pCMV-mediated CYP2C8 overexpression and its metabolites, EETs, markedly suppressed TNF-α induced inflammatory cytokines IL-6 and MCP-1 expression via the activation of NF-κB and degradation of IκBα. Moreover, pretreatment with 11,12-EET significantly blocked TNF-α-induced ROS production. CYP2C8-derived EETs also effectively alleviated the migration of VSMCs and improved the function of endothelial cells through the upregulation of eNOS, which was significantly decreased under the stimulation of TNF-α. Furthermore, these protective effects observed were mediated by PPARγ activation. To the best of our knowledge, the results of the present study demonstrated for the first time that CYP2C8-derived EETs exerted antivascular inflammatory and anti-oxidative effects, at least in part, through the activation of PPARγ. Thus, the CYP2C8 gene may be useful in the prevention and treatment of vascular inflammatory diseases.
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Affiliation(s)
- Wanjun Liu
- The Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Bei Wang
- The Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Hu Ding
- The Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Dao Wen Wang
- The Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
| | - Hesong Zeng
- The Institute of Hypertension and Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
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185
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Abstract
Essential genes are those genes that are needed by organisms at any time and under any conditions. It is very important for us to identify essential genes from bacterial genomes because of their vital role in synthetic biology and biomedical practices. In this paper, we developed a support vector machine (SVM)-based method to predict essential genes of bacterial genomes using only compositional features. These features are all derived from the primary sequences, i.e., nucleotide sequences and protein sequences. After training on the multiple samplings of the labeled (essential or not essential) features using a library for SVM, we obtained an average area under the ROC curve (AUC) of about 0.82 in a 5-fold cross-validation for Escherichia coli and about 0.74 for Mycoplasma pulmonis. We further evaluated the performance of the method proposed using the dataset consisting of 16 bacterial genomes, and an average AUC of 0.76 was achieved. Based on this training dataset, a model for essential gene prediction was established. Another two independent genomes, Shewanella oneidensis RW1 and Salmonella enterica serovar Typhimurium SL1344 were used to evalutate the model. Results showed that the AUC sores were 0.77 and 0.81, respectively. For the convenience of the vast majority of experimental scientists, a web server has been constructed, which is freely available at http://cefg.uestc.edu.cn:9999/egp.
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Affiliation(s)
- L W Ning
- Center of Bioinformatics and Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - H Lin
- Center of Bioinformatics and Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - H Ding
- Center of Bioinformatics and Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - J Huang
- Center of Bioinformatics and Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - N Rao
- Center of Bioinformatics and Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - F B Guo
- Center of Bioinformatics and Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
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186
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Li Z, Huang J, Zhao J, Chen C, Wang H, Ding H, Wang DW, Wang DW. Rapid molecular genetic diagnosis of hypertrophic cardiomyopathy by semiconductor sequencing. J Transl Med 2014; 12:173. [PMID: 24938736 PMCID: PMC4072843 DOI: 10.1186/1479-5876-12-173] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Accepted: 06/11/2014] [Indexed: 01/23/2023] Open
Abstract
Background Rapidly determining the complex genetic basis of Hypertrophic cardiomyopathy (HCM) is vital to better understanding and optimally managing this common polygenetic cardiovascular disease. Methods A rapid custom Ion-amplicon-resequencing assay, covering 30 commonly affected genes of HCM, was developed and validated in 120 unrelated patients with HCM to facilitate genetic diagnosis of this disease. With this HCM-specific panel and only 20 ng of input genomic DNA, physicians can, for the first time, go from blood samples to variants within a single day. Results On average, this approach gained 595628 mapped reads per sample, 95.51% reads on target (64.06 kb), 490-fold base coverage depth and 93.24% uniformity of base coverage in CDS regions of the 30 HCM genes. After validation, we detected underlying pathogenic variants in 87% (104 of 120) samples. Tested seven randomly selected HCM genes in eight samples by Sanger sequencing, the sensitivity and false-positive-rate of this HCM panel was 100% and 5%, respectively. Conclusions This Ion amplicon HCM resequencing assay provides a currently most rapid, comprehensive, cost-effective and reliable measure for genetic diagnosis of HCM in routinely obtained samples.
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Affiliation(s)
| | | | | | | | | | | | - Dao Wu Wang
- Departments of Internal Medicine and Gene Therapy Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095# Jiefang Ave, Wuhan 430030, China.
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187
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Long W, Shi Z, Fan S, Liu L, Lu Y, Guo X, Rong C, Cui X, Ding H. Association of maternal KIR and fetal HLA-C genes with the risk of preeclampsia in the Chinese Han population. Placenta 2014; 36:433-7. [PMID: 24951171 DOI: 10.1016/j.placenta.2014.05.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Revised: 05/21/2014] [Accepted: 05/24/2014] [Indexed: 01/05/2023]
Abstract
INTRODUCTION This study is to investigate the distribution of inhibitory and activating killer-cell immunoglobulin-like receptors (KIRs) and the combination of KIR/human leukocyte antigen (HLA)-C in women with preeclampsia in the Chinese Han population. METHODS A total of 271 patients and 295 controls were enrolled in our study. The inhibitory/activating KIR and HLA-C genes were detected using the PCR-SSP (polymerase chain reaction with sequence-specific primers) method. RESULTS Our result showed that decreased numbers of individual activating KIR genes (2DS2, 2DS3, and 2DS5) were observed in women with preeclampsia. Furthermore, the gene frequency of total activating KIRs was significantly lower in patients compared with that of the controls (P = 0.03). The frequency of the KIR2DL1 gene was increased in women with preeclampsia when a homozygous HLA-C2 allele appeared in the fetus. CONCLUSION The results suggest that a KIR genetic variation might influence the risk of preeclampsia. The lack of activating KIRs could possibly lower uterine natural killer (uNK) cell activation, thereby contributing to the pathogenesis of preeclampsia. Moreover, the imbalance of the inhibitory or activating signals at the maternal-fetal interface seems to play a regulatory role in the occurrence of preeclampsia.
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Affiliation(s)
- W Long
- Department of Obstetrics, Nanjing Medical University Affiliated Nanjing Maternal and Child Health Hospital, Nanjing 210004, China
| | - Z Shi
- Department of Obstetrics, Nanjing Medical University Affiliated Nanjing Maternal and Child Health Hospital, Nanjing 210004, China
| | - S Fan
- Department of Obstetrics, Nanjing Medical University Affiliated Nanjing Maternal and Child Health Hospital, Nanjing 210004, China
| | - L Liu
- Department of Obstetrics, Nanjing Medical University Affiliated Nanjing Maternal and Child Health Hospital, Nanjing 210004, China
| | - Y Lu
- Department of Obstetrics, Nanjing Medical University Affiliated Nanjing Maternal and Child Health Hospital, Nanjing 210004, China
| | - X Guo
- Maternal and Child Health Medical Institute, Nanjing Medical University Affiliated Nanjing Maternal and Child Health Hospital, Nanjing 210004, China
| | - C Rong
- Maternal and Child Health Medical Institute, Nanjing Medical University Affiliated Nanjing Maternal and Child Health Hospital, Nanjing 210004, China
| | - X Cui
- Department of Obstetrics, Nanjing Medical University Affiliated Nanjing Maternal and Child Health Hospital, Nanjing 210004, China.
| | - H Ding
- Department of Obstetrics, Nanjing Medical University Affiliated Nanjing Maternal and Child Health Hospital, Nanjing 210004, China.
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188
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Ziemer B, Ding H, Cho H. SU-F-18C-05: Characterization of a Silicon Strip Photon-Counting Detector in the Presence of Compton Scatter: A Simulation Study. Med Phys 2014. [DOI: 10.1118/1.4889089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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189
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Chu X, Ding H, Cui G, Xu Y, Wang DW, He Y. Functional consequences of a novel point mutation in the CYP21A2 gene identified in a Chinese Han patient with nonclassic 21-hydroxylase deficiency. Clin Endocrinol (Oxf) 2014; 80:927-8. [PMID: 23927611 DOI: 10.1111/cen.12309] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaojing Chu
- Department of Endocrinology, Internal Medicine of Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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190
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Ding H, Zhao B, Klopfer M, Masaki F, Baturin P, Molloi S. TU-F-18C-01: Breast Tissue Decomposition Using Spectral CT After Distortion Correction. Med Phys 2014. [DOI: 10.1118/1.4889346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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191
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Lam Ng A, Ding H, Cho H, Molloi S. TU-F-18A-08: Effect of Quantum Detection Efficiency and Energy Bin Selection On Contrast-To-Noise-Ratio for Energy-Resolved Photon-Counting Detectors. Med Phys 2014. [DOI: 10.1118/1.4889344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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192
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Lam Ng A, Ding H, Cho H, Molloi S. SU-E-I-77: A Noise Reduction Technique for Energy-Resolved Photon-Counting Detectors. Med Phys 2014. [DOI: 10.1118/1.4888027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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193
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Cho H, Ding H, Ziemer B, Molloi S. SU-E-I-67: X-Ray Fluorescence for Energy Response Calibration of a Photon Counting Detector: A Simulation Study. Med Phys 2014. [DOI: 10.1118/1.4888017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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194
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Ding H, Cho H, Barber W, Iwanczyk J, Molloi S. TU-F-18A-05: An X-Ray Fluorescence Technique for Energy Calibration of Photon-Counting Detectors. Med Phys 2014. [DOI: 10.1118/1.4889341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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195
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Cho H, Ding H, Barber W, Iwanczyk J, Molloi S. TU-F-18C-08: Micro-Calcification Detectability Using Spectral Breast CT Based On a Si Strip Detector. Med Phys 2014. [DOI: 10.1118/1.4889353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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196
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Fritz AJ, Stojkovic B, Ding H, Xu J, Bhattacharya S, Gaile D, Berezney R. Wide-scale alterations in interchromosomal organization in breast cancer cells: defining a network of interacting chromosomes. Hum Mol Genet 2014; 23:5133-46. [PMID: 24833717 DOI: 10.1093/hmg/ddu237] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The interchromosomal spatial positionings of a subset of human chromosomes was examined in the human breast cell line MCF10A (10A) and its malignant counterpart MCF10CA1a (CA1a). The nine chromosomes selected (#1, 4, 11, 12, 15, 16, 18, 21 and X) cover a wide range in size and gene density and compose ∼40% of the total human genome. Radial positioning of the chromosome territories (CT) was size dependent with certain of the CT more peripheral in CA1a. Each CT was in close proximity (interaction) with a similar number of other CT except the inactive CTXi. It had lower levels of interchromosomal partners in 10A which increased strikingly in CA1a. Major alterations from 10A to CA1a were detected in the pairwise interaction profiles which were subdivided into five types of altered interaction profiles: overall increase, overall decrease, switching from 1 to ≥2, vice versa or no change. A global data mining program termed the chromatic median calculated the most probable overall association network for the entire subset of CT. This interchromosomal network was drastically altered in CA1a with only 1 of 20 shared connections. We conclude that CT undergo multiple and preferred interactions with other CT in the cell nucleus and form preferred-albeit probabilistic-interchromosomal networks. This network of interactions is highly altered in malignant human breast cells. It is intriguing to consider the relationship of these alterations to the corresponding changes in the gene expression program of these malignant cancer cells.
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Affiliation(s)
| | - Branislav Stojkovic
- Department of Computer Sciences, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Hu Ding
- Department of Computer Sciences, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Jinhui Xu
- Department of Computer Sciences, University at Buffalo, State University of New York, Buffalo, NY 14260, USA
| | - Sambit Bhattacharya
- Department of Computer Sciences, Fayetteville State University, Fayetteville, NC 28301, USA
| | - Daniel Gaile
- Department of Biostatistics, University at Buffalo, State University of New York, Buffalo, NY 14214, USA
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197
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Richard P, Capan C, Ma J, Zhang P, Xu N, Qian T, Denlinger JD, Chen GF, Sefat AS, Fisk Z, Ding H. Angle-resolved photoemission spectroscopy observation of anomalous electronic states in EuFe2As(2-x)P(x). J Phys Condens Matter 2014; 26:035702. [PMID: 24351570 DOI: 10.1088/0953-8984/26/3/035702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We used angle-resolved photoemission spectroscopy to investigate the electronic structure and the Fermi surface of EuFe2As2, EuFe2As1.4P0.6 and EuFe2P2. We observed doubled core level peaks associated with the pnictide atoms. Using K atoms evaporated at the surface to affect the surface quality, we show that one component of these doubled peaks is related to a surface state. Nevertheless, strong electronic dispersion along the c-axis, especially pronounced in EuFe2P2, is observed for at least one band, thus indicating that the Fe states, albeit probably affected at the surface, do not form pure two-dimensional surface states. We determine the evolution of the Fermi surface as a function of the P content and reveal that the hole Fermi surface pockets enlarge with increasing P content. We also show that the spectral weight near the Fermi level of EuFe2P2 is reduced as compared to that of EuFe2As2 and EuFe2As1.4P0.6. Finally, we identify the electronic states associated with the Eu(2+) f states and show an anomalous jump in EuFe2P2.
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Affiliation(s)
- P Richard
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. Collaborative Innovation Center of Quantum Matter, Beijing, People's Republic of China
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198
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Affiliation(s)
- X. F. Hou
- School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China
- NiuShan Mining Co. Ltd, Anhui, China
| | - H. Ding
- School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China
| | - Y. X. Zheng
- School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China
| | - M. M. Wang
- School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China
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199
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Affiliation(s)
- X. Hou
- School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China
- Tongling County NiuShan Mining Co., Ltd., Anhui Province, China
| | - H. Ding
- School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China
| | - Y. Liang
- School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China
| | - Y. X. Zheng
- School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China
| | - Z. D. Yang
- Tongling County NiuShan Mining Co., Ltd., Anhui Province, China
| | - H. N. Luo
- School of Materials Science and Engineering, China University of Geosciences, Beijing 100083, China
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Cui G, Sun J, Zhang L, Li R, Wang Y, Cianflone K, Ding H, Wang DW. Lack of causal relationship between leukocyte telomere length and coronary heart disease. Atherosclerosis 2014; 233:375-380. [PMID: 24530766 DOI: 10.1016/j.atherosclerosis.2014.01.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 01/02/2014] [Accepted: 01/03/2014] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To investigate the association between genetic variation in telomerase RNA component (TERC) and leukocyte telomere length (LTL) with risk of coronary heart disease (CHD). METHODS AND RESULTS An analysis of LTL was conducted, focusing on two SNPs in 2 community-based cohort populations comprising 3500 Chinese Han individuals. In addition, LTL ratio was determined in a case-control setting involving 4351 participants: 2211 healthy individuals and 2140 CHD patients. The association between LTL and the presence and extent of cardiovascular and cerebrovascular lesions were tested. Results confirmed the association of rs12696304 and rs16847897 with LTL in the Chinese Han population (P=1.63×10(-6) and P=1.44×10(-7), respectively). However, these SNPs confer a moderate risk for CHD but did not achieve significant threshold after multiple corrections. Decreased LTL ratio was associated with CHD (odds ratio [OR], 1.13; 95% confidence interval [CI], 1.02-1.34; P<0.01). In addition, the LTL ratio in CHD patients was related to numbers of vascular disease lesions. CONCLUSIONS Our results do not support a causal role of LTL for the development of CHD. However, LTL may be related to complex conditions associated with cardiovascular and cerebrovascular disease manifestations.
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Affiliation(s)
- Guanglin Cui
- Departments of Internal Medicine and the Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095# Jiefang Ave., Wuhan 430030, China
| | - Jing Sun
- Departments of Internal Medicine and the Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095# Jiefang Ave., Wuhan 430030, China
| | - Lina Zhang
- Departments of Internal Medicine and the Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095# Jiefang Ave., Wuhan 430030, China
| | - Rui Li
- Departments of Internal Medicine and the Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095# Jiefang Ave., Wuhan 430030, China
| | - Yan Wang
- Departments of Internal Medicine and the Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095# Jiefang Ave., Wuhan 430030, China
| | - Katherine Cianflone
- Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Y4332, 2725 Chemin Ste-Foy, Québec, QC G1V 4G5, Canada
| | - Hu Ding
- Departments of Internal Medicine and the Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095# Jiefang Ave., Wuhan 430030, China.
| | - Dao Wen Wang
- Departments of Internal Medicine and the Institute of Hypertension, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095# Jiefang Ave., Wuhan 430030, China.
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