151
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Qiao B, Sengupta A, Liu Y, McDonald KP, Pink M, Anderson JR, Raghavachari K, Flood AH. Electrostatic and Allosteric Cooperativity in Ion-Pair Binding: A Quantitative and Coupled Experiment–Theory Study with Aryl–Triazole–Ether Macrocycles. J Am Chem Soc 2015. [DOI: 10.1021/jacs.5b05839] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bo Qiao
- Department of Chemistry, Indiana University, 800 East Kirkwood
Avenue, Bloomington, Indiana 47405, United States
| | - Arkajyoti Sengupta
- Department of Chemistry, Indiana University, 800 East Kirkwood
Avenue, Bloomington, Indiana 47405, United States
| | - Yun Liu
- Department of Chemistry, Indiana University, 800 East Kirkwood
Avenue, Bloomington, Indiana 47405, United States
| | - Kevin P. McDonald
- Department of Chemistry, Indiana University, 800 East Kirkwood
Avenue, Bloomington, Indiana 47405, United States
| | - Maren Pink
- Department of Chemistry, Indiana University, 800 East Kirkwood
Avenue, Bloomington, Indiana 47405, United States
| | - Joseph R. Anderson
- Department of Chemistry, Indiana University, 800 East Kirkwood
Avenue, Bloomington, Indiana 47405, United States
| | - Krishnan Raghavachari
- Department of Chemistry, Indiana University, 800 East Kirkwood
Avenue, Bloomington, Indiana 47405, United States
| | - Amar H. Flood
- Department of Chemistry, Indiana University, 800 East Kirkwood
Avenue, Bloomington, Indiana 47405, United States
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152
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Qiao B, Cui JY, Sun L, Yang S, Zhao YL. Cross-priming amplification targeting the coagulase gene for rapid detection of coagulase-positive Staphylococci. J Appl Microbiol 2015; 119:188-95. [PMID: 25913490 DOI: 10.1111/jam.12836] [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] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 04/07/2015] [Accepted: 04/15/2015] [Indexed: 11/26/2022]
Abstract
AIMS To develop and evaluate cross-priming amplification (CPA) combined with immuno-blotting for the detection of coagulase-positive Staphylococci including Staphylococcus aureus. METHODS AND RESULTS Twenty-four sets of cross and detection primers were designed according to four sequences of coagulase gene in Staph. aureus. The most specific primer pair was screened out for the next amplification and interaction. The specificity was evaluated in a total of 53 species of Staph. aureus and non-Staph. aureus. Two red lines indicating positive were always observed on the BioHelix Express strip for 12 subspecies of Staph. aureus. In contrast, only one signal line showing negative results was detected in all of non-Staph. aureus samples. The limit of detection (LOD) of CPA was 3·6 ± 2·7 fg for the genomic DNA, which is about 100 and 10 times sensitive than those of PCR and loop-mediated isothermal amplification respectively. For the pure culture of Staph. aureus and milk powders, the LODs of CPA were about 1·34 CFU per reaction and 5·2 ± 3·7 CFU per 100 g of milk powder respectively. The CPA method was also successfully applied to evaluate the contamination of Staph. aureus in 318 samples of daily food. CONCLUSIONS CPA is a very sensitive and rapid method to detect Staph. aureus by simple laboratory instrument. SIGNIFICANCE AND IMPACT OF THE STUDY It is the first report on the application of the CPA with immuno-blotting for detection of coagulase-positive Staphylococci including Staph. aureus.
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Affiliation(s)
- B Qiao
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, China
| | - J-Y Cui
- School of Life Science, Shandong Province Key Laboratory of Applied Mycology, Qingdao International Center on Microbes Utilizing Biogas, Qingdao Agricultural University, Qingdao, Shandong Province, China
| | - L Sun
- Department of Biochemistry and Molecular Biology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, China
| | - S Yang
- School of Life Science, Shandong Province Key Laboratory of Applied Mycology, Qingdao International Center on Microbes Utilizing Biogas, Qingdao Agricultural University, Qingdao, Shandong Province, China.,Key Laboratory of Systems Bioengineering, Ministry of Education, Tianjin University, Tianjin, China
| | - Y-L Zhao
- Department of Medical Microbiology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
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153
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Wu J, Zuo Y, Hu Y, Wang J, Li J, Qiao B, Jiang D. Development and in vitro characterization of drug delivery system of rifapentine for osteoarticular tuberculosis. Drug Des Devel Ther 2015; 9:1359-66. [PMID: 25834394 PMCID: PMC4357616 DOI: 10.2147/dddt.s78407] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The study was to develop and evaluate the rifapentine-loaded poly(lactic acid-co-glycolic acid) (PLGA) microspheres (RPMs) for the treatment of osteoarticular tuberculosis to avoid critical side effects caused by oral regimens of antibiotics or intravenous antibiotics. The RPMs were spherical with rough surfaces, and elevated amounts of rifapentine in the formulation markedly increased the particle size and drug loading, while decreased the size distribution and entrapment efficiency. The highest drug loading and encapsulation efficiency of RPMs were 23.93%±3.93% and 88.49%±8.49%, respectively. After the initial rapid drug release, the release rate gradually decreased, and approximately 80% of the encapsulated rifapentine was released after 30 days of incubation. Moreover, RPMs could effectively inhibit the growth of Staphylococcus aureus. With increasing rifapentine content, the inhibition zones were continuously enlarged while the minimal inhibitory concentration values decreased. These results suggested that RPMs were bioactive and controlled release delivery systems for the treatment of osteoarticular tuberculosis.
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Affiliation(s)
- Jun Wu
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Yi Zuo
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Yunjiu Hu
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Jian Wang
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Jidong Li
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu, Sichuan, People's Republic of China
| | - Bo Qiao
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Dianming Jiang
- Department of Orthopedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
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154
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Qiao B, Shui W, Cai L, Guo S, Jiang D. Human mesenchymal stem cells as delivery of osteoprotegerin gene: homing and therapeutic effect for osteosarcoma. Drug Des Devel Ther 2015; 9:969-76. [PMID: 25733814 PMCID: PMC4338779 DOI: 10.2147/dddt.s77116] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Biological treatments have been studied extensively and previous studies have proved that osteoprotegerin (OPG) can inhibit the development and progress of human osteosarcoma. However, the utility of biologic agents for cancer therapy has a short half-life, which can hardly deliver to and function in tumor sites efficiently. Mesenchymal stem cells (MSCs) have the potential to migrate to tumor sites. In this study, MSCs transfected with adenoviruses carrying the OPG gene (MSCs-OPG) were used via the tail vein to treat athymic nude mice (nu/nu) bearing osteosarcoma. In vivo and ex vivo images were used to validate the MSCs homing to tumors. The therapeutic effect for osteosarcoma was evaluated by observations on growth of tumors and bone destruction. The results showed that infected MSCs-OPG labeled with red fluorescent protein (RFP) can migrate to tumor sites and express OPG protein. The treatment by MSCs-OPG reduced the tumor growth and inhibited bone destruction in vivo. All these indicated that MSCs can deliver OPG to tumor sites, which could be a new direction of biological treatment for human osteosarcoma.
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Affiliation(s)
- Bo Qiao
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Wei Shui
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Li Cai
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Shuquan Guo
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Dianming Jiang
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
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155
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Abstract
A new simple catalytic system consisting of copper-aluminium and hydrotalcite (CuAl–HT) has been developed using a facile one-pot method without harm to the environment.
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Affiliation(s)
- Bo Qiao
- College of Chemistry and Chemical Engineering Lanzhou University
- The Key Laboratory of Catalytic engineering of Gansu Province
- Lanzhou 730000, China
| | - Le Zhang
- College of Chemistry and Chemical Engineering Lanzhou University
- The Key Laboratory of Catalytic engineering of Gansu Province
- Lanzhou 730000, China
- Department of Chemical Engineering
- College of Jiu quan Vocational Technology
| | - Rong Li
- College of Chemistry and Chemical Engineering Lanzhou University
- The Key Laboratory of Catalytic engineering of Gansu Province
- Lanzhou 730000, China
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156
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Hirsch BE, McDonald KP, Qiao B, Flood AH, Tait SL. Selective anion-induced crystal switching and binding in surface monolayers modulated by electric fields from scanning probes. ACS Nano 2014; 8:10858-10869. [PMID: 25257197 DOI: 10.1021/nn504685t] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Anion-selective (Br(-) and I(-)) and voltage-driven crystal switching between two differently packed phases (α ⇆ β) was observed in 2D crystalline monolayers of aryl-triazole receptors ordered at solution-graphite interfaces. Addition of Br(-) and I(-) was found to stimulate the α → β phase transformation and to produce ion binding to the β phase assembly, while Cl(-) and BF4(-) addition retained the α phase. Unlike all other surface assemblies of either charged molecules or ion-templated 2D crystallization of metal-ligand or receptor-based adsorbates, the polarity of the electric field between the localized scanning tip and the graphite substrate was found to correlate with phase switching: β → α is driven at -1.5 V, while α → β occurs at +1.1 V. Ion-pairing between the countercations and the guest anions was also observed. These observations are supported by control studies including variation of anion species, relative anion concentration, surface temperature, tip voltage, and scanning time.
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Affiliation(s)
- Brandon E Hirsch
- Department of Chemistry, Indiana University , 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, United States
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157
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Abstract
An aniline-rhodamine-based ratiometric fluorescent probe (RI) was designed and synthesized. , the metal coordinating chromophoric ligand, exhibited high selectivity and sensitivity for Pd(2+) ions with a detection limit of 73.8 nM. This method of Pd(2+) detection had a 10 min response time.
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Affiliation(s)
- Bo Qiao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, E224 West Campus, No. 2, Linggong Road, Ganjingzi District, Dalian 116024, China.
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158
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159
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McDonald KP, Qiao B, Twum EB, Lee S, Gamache PJ, Chen CH, Yi Y, Flood AH. Quantifying chloride binding and salt extraction with poly(methyl methacrylate) copolymers bearing aryl-triazoles as anion receptor side chains. Chem Commun (Camb) 2014; 50:13285-8. [DOI: 10.1039/c4cc03362k] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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160
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Wu D, Zheng CY, Qiao B, Zhou CT, Yan XQ, Yu MY, He XT. Suppression of transverse ablative Rayleigh-Taylor-like instability in the hole-boring radiation pressure acceleration by using elliptically polarized laser pulses. Phys Rev E Stat Nonlin Soft Matter Phys 2014; 90:023101. [PMID: 25215833 DOI: 10.1103/physreve.90.023101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Indexed: 06/03/2023]
Abstract
It is shown that the transverse Rayleigh-Taylor-like (RT) instability in the hole-boring radiation pressure acceleration can be suppressed by using an elliptically polarized (EP) laser. A moderate J×B heating of the EP laser will thermalize the local electrons, which leads to the transverse diffusion of ions, suppressing the short wavelength perturbations of RT instability. A proper condition of polarization ratio is obtained analytically for the given laser intensity and plasma density. The idea is confirmed by two-dimensional particle-in-cell simulations, showing that the ion beam driven by the EP laser is more concentrated and intense compared with that of the circularly polarized laser.
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Affiliation(s)
- D Wu
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China
| | - C Y Zheng
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China and Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China
| | - B Qiao
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China
| | - C T Zhou
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China and Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China
| | - X Q Yan
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China
| | - M Y Yu
- Institute of Fusion Theory and Simulation, Zhejiang University, Hangzhou, 310027, China
| | - X T He
- Key Laboratory of HEDP of the Ministry of Education, CAPT, and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China and Institute of Applied Physics and Computational Mathematics, Beijing, 100088, China
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161
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Hirsch BE, Lee S, Qiao B, Chen CH, McDonald KP, Tait SL, Flood AH. Anion-induced dimerization of 5-fold symmetric cyanostars in 3D crystalline solids and 2D self-assembled crystals. Chem Commun (Camb) 2014; 50:9827-30. [DOI: 10.1039/c4cc03725a] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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162
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Wang J, Sun S, Mu D, Wang J, Sun W, Xiong X, Qiao B, Peng X. A Heterodinuclear Complex OsIr Exhibiting Near-Infrared Dual Luminescence Lights Up the Nucleoli of Living Cells. Organometallics 2014. [DOI: 10.1021/om500357x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Jitao Wang
- State Key Laboratory of Fine Chemicals and ‡School of Life Science & Biotechnology, Dalian University of Technology, 2 Linggong Road, 116024 Dalian, People’s Republic of China
| | - Shiguo Sun
- State Key Laboratory of Fine Chemicals and ‡School of Life Science & Biotechnology, Dalian University of Technology, 2 Linggong Road, 116024 Dalian, People’s Republic of China
| | - Daozhou Mu
- State Key Laboratory of Fine Chemicals and ‡School of Life Science & Biotechnology, Dalian University of Technology, 2 Linggong Road, 116024 Dalian, People’s Republic of China
| | - Jingyun Wang
- State Key Laboratory of Fine Chemicals and ‡School of Life Science & Biotechnology, Dalian University of Technology, 2 Linggong Road, 116024 Dalian, People’s Republic of China
| | - Wei Sun
- State Key Laboratory of Fine Chemicals and ‡School of Life Science & Biotechnology, Dalian University of Technology, 2 Linggong Road, 116024 Dalian, People’s Republic of China
| | - Xiaoqing Xiong
- State Key Laboratory of Fine Chemicals and ‡School of Life Science & Biotechnology, Dalian University of Technology, 2 Linggong Road, 116024 Dalian, People’s Republic of China
| | - Bo Qiao
- State Key Laboratory of Fine Chemicals and ‡School of Life Science & Biotechnology, Dalian University of Technology, 2 Linggong Road, 116024 Dalian, People’s Republic of China
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals and ‡School of Life Science & Biotechnology, Dalian University of Technology, 2 Linggong Road, 116024 Dalian, People’s Republic of China
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163
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Qiao B, Li J, Zhu Q, Guo S, Qi X, Li W, Wu J, Liu Y, Jiang D. Bone plate composed of a ternary nano-hydroxyapatite/polyamide 66/glass fiber composite: biomechanical properties and biocompatibility. Int J Nanomedicine 2014; 9:1423-32. [PMID: 24669191 PMCID: PMC3962318 DOI: 10.2147/ijn.s57353] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
An ideal bone plate for internal fixation of bone fractures should have good biomechanical properties and biocompatibility. In this study, we prepared a new nondegradable bone plate composed of a ternary nano-hydroxyapatite/polyamide 66/glass fiber (n-HA/PA66/GF) composite. A breakage area on the n-HA/PA66/GF plate surface was characterized by scanning electron microscopy. Its mechanical properties were investigated using bone-plate constructs and biocompatibility was evaluated in vitro using bone marrow-derived mesenchymal stem cells. The results confirmed that adhesion between the n-HA/PA66 matrix and the glass fibers was strong, with only a few fibers pulled out at the site of breakage. Fractures fixed by the n-HA/PA66/GF plate showed lower stiffness and had satisfactory strength compared with rigid fixation using a titanium plate. Moreover, the results with regard to mesenchymal stem cell morphology, MTT assay, Alizarin Red S staining, enzyme-linked immunosorbent assay, and reverse transcription polymerase chain reaction for alkaline phosphatase and osteocalcin showed that the n-HA/PA66/GF composite was suitable for attachment and proliferation of mesenchymal stem cells, and did not have a negative influence on matrix mineralization or osteogenic differentiation of mesenchymal stem cells. These observations indicate that the n-HA/PA66/GF plate has good biomechanical properties and biocompatibility, and may be considered a new option for internal fixation in orthopedic surgery.
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Affiliation(s)
- Bo Qiao
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Jidong Li
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu, People's Republic of China
| | - Qingmao Zhu
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Shuquan Guo
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Xiaotong Qi
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Weichao Li
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Jun Wu
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Yang Liu
- Department of Orthopaedics, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Dianming Jiang
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
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164
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Sun S, Qiao B, Jiang N, Wang J, Zhang S, Peng X. Naphthylamine–Rhodamine-Based Ratiometric Fluorescent Probe for the Determination of Pd2+ Ions. Org Lett 2014; 16:1132-5. [PMID: 24483148 DOI: 10.1021/ol500284p] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Shiguo Sun
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, E224 West Campus, No. 2, Linggong
Road, Ganjingzi District, 116024 Dalian, China
| | - Bo Qiao
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, E224 West Campus, No. 2, Linggong
Road, Ganjingzi District, 116024 Dalian, China
| | - Na Jiang
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, E224 West Campus, No. 2, Linggong
Road, Ganjingzi District, 116024 Dalian, China
| | - Jitao Wang
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, E224 West Campus, No. 2, Linggong
Road, Ganjingzi District, 116024 Dalian, China
| | - Si Zhang
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, E224 West Campus, No. 2, Linggong
Road, Ganjingzi District, 116024 Dalian, China
| | - Xiaojun Peng
- State Key Laboratory of Fine
Chemicals, Dalian University of Technology, E224 West Campus, No. 2, Linggong
Road, Ganjingzi District, 116024 Dalian, China
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165
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Sun S, Wang J, Mu D, Wang J, Bao Y, Qiao B, Peng X. A heterodinuclear RuIr metal complex for direct imaging of rRNA in living cells. Chem Commun (Camb) 2014; 50:9149-52. [DOI: 10.1039/c4cc04501g] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A novel dual luminescence heterodinuclear RuIr complex for RNA detection was developed, which was successfully used to image rRNA in living cells.
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Affiliation(s)
- Shiguo Sun
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian, China
| | - Jitao Wang
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian, China
| | - Daozhou Mu
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian, China
| | - Jingyun Wang
- School of Life Science and Biotechnology
- Dalian University of Technology
- Dalian, China
| | - Yongming Bao
- School of Life Science and Biotechnology
- Dalian University of Technology
- Dalian, China
| | - Bo Qiao
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian, China
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals
- Dalian University of Technology
- Dalian, China
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166
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Li WC, Jiang R, Jiang DM, Zhu FC, Su B, Qiao B, Qi XT. Lipopolysaccharide preconditioning attenuates apoptotic processes and improves neuropathologic changes after spinal cord injury in rats. Int J Neurosci 2013; 124:585-92. [PMID: 24205811 DOI: 10.3109/00207454.2013.864289] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We have shown earlier that administration of low-dose lipopolysaccharide (LPS) significantly contributed to recovery of motor function after traumatic spinal cord injury in the adult female rat. Using the same standardized animal model, we have now designed a set of experiments to test the hypothesis that LPS preconditioning attenuates stress-related apoptotic processes early after spinal cord trauma. The lower thoracic spinal cord injury in adult female Sprague-Dawley rats was caused by a 10 g weight rod drop from 25 mm on the dural surface of the exposed spinal cord at T10. The rats were randomly assigned to three groups: Sham injury, control (received normal saline alone), and LPS preconditioning (0.2 mg/kg, ip; 72 h prior to the injury). The animals were euthanized at 72 h postinjury. Neuropathologic changes were assessed using hematoxylin and eosin staining. SCI-induced apoptosis were observed by transmission electron microscopy. Caspase-3, cleaved caspase-3, Bax, and Bcl-2 were examined with immunohistochemistry or Western blotting. Compared with the control group, LPS preconditioning group showed significant improvement in the SCI-induced morphology changes. Furthermore, LPS preconditioning reduced the expressions of apoptotic markers caspase-3, cleaved caspase-3, and Bax, upregulated the expression of antiapoptotic marker Bcl-2 in the samples of spinal cord. Low-dose LPS attenuated the recruitment of inflammatory cells and the proliferation of glial cells in the site of injury. LPS preconditioning has neuroprotective effects against TSCI in rats due to its antiapoptosis properties as shown by the inhibition of caspase pathway and the upregulation of antiapoptotic protein.
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Affiliation(s)
- Wei-Chao Li
- 1Department of Orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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167
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Qi X, Li H, Qiao B, Li W, Hao X, Wu J, Su B, Jiang D. Development and characterization of an injectable cement of nano calcium-deficient hydroxyapatite/multi(amino acid) copolymer/calcium sulfate hemihydrate for bone repair. Int J Nanomedicine 2013; 8:4441-52. [PMID: 24293996 PMCID: PMC3839801 DOI: 10.2147/ijn.s54289] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
A novel injectable bone cement was developed by integration of nano calcium-deficient hydroxyapatite/multi(amino acid) copolymer (n-CDHA/MAC) and calcium sulfate hemihydrate (CSH; CaSO4 · 1/2H2O). The structure, setting time, and compressive strength of the cement were investigated. The results showed that the cement with a liquid to powder ratio of 0.8 mL/g exhibited good injectability and appropriate setting time and mechanical properties. In vitro cell studies indicated that MC3T3-E1 cells cultured on the n-CDHA/MAC/CSH composite spread well and showed a good proliferation state. The alkaline phosphatase activity of the MC3T3-E1 cells cultured on the n-CDHA/MAC/CSH composite was significantly higher than that of the cells on pure CSH at 4 and 7 days of culture. The n-CDHA/MAC/CSH cement was implanted into critical size defects of the femoral condyle in rabbits to evaluate its biocompatibility and osteogenesis in vivo. Radiological and histological results indicated that introduction of the n-CDHA/MAC into CSH enhanced new bone formation, and the n-CDHA/MAC/CSH cement exhibited good biocompatibility and degradability. In conclusion, the injectable n-CDHA/MAC/CSH composite cement has a significant clinical advantage over pure CSH cement, and may be a promising bone graft substitute for the treatment of bone defects.
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Affiliation(s)
- Xiaotong Qi
- Department of Orthopedics, The First Affiliated Hospital, Chongqing Medical University, Chongqing, People's Republic of China
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168
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Su B, Peng X, Jiang D, Wu J, Qiao B, Li W, Qi X. In vitro and in vivo evaluations of nano-hydroxyapatite/polyamide 66/glass fibre (n-HA/PA66/GF) as a novel bioactive bone screw. PLoS One 2013; 8:e68342. [PMID: 23861888 PMCID: PMC3704538 DOI: 10.1371/journal.pone.0068342] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Accepted: 05/28/2013] [Indexed: 11/18/2022] Open
Abstract
In this study, we prepared nano-hydroxyapatite/polyamide 66/glass fibre (n-HA/PA66/GF) bioactive bone screws. The microstructure, morphology and coating of the screws were characterised, and the adhesion, proliferation and viability of MC3T3-E1 cells on n-HA/PA66/GF scaffolds were determined using scanning electron microscope, CCK-8 assays and cellular immunofluorescence analysis. The results confirmed that n-HA/PA66/GF scaffolds were biocompatible and had no negative effect on MC3T3-E1 cells in vitro. To investigate the in vivo biocompatibility, internal fixation properties and osteogenesis of the bioactive screws, both n-HA/PA66/GF screws and metallic screws were used to repair intercondylar femur fractures in dogs. General photography, CT examination, micro-CT examination, histological staining and biomechanical assays were performed at 4, 8, 12 and 24 weeks after operation. The n-HA/PA66/GF screws exhibited good biocompatibility, high mechanical strength and extensive osteogenesis in the host bone. Moreover, 24 weeks after implantation, the maximum push-out load of the bioactive screws was greater than that of the metallic screws. As shown by their good cytocompatibility, excellent biomechanical strength and fast formation and ingrowth of new bone, n-HA/PA66/GF screws are thus suitable for orthopaedic clinical applications.
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Affiliation(s)
- Bao Su
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xiaohua Peng
- Department of Respiratory Medicine, Xinhua Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, China
| | - Dianming Jiang
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Jun Wu
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Bo Qiao
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Weichao Li
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Xiaotong Qi
- Department of Orthopaedics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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169
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Zhao JY, Qiao B, Duan WY, Gong XH, Peng QQ, Jiang SS, Lu CQ, Chen YJ, Shen HB, Huang GY, Jin L, Wang HY. Genetic variants reducing MTR gene expression increase the risk of congenital heart disease in Han Chinese populations. Eur Heart J 2013; 35:733-42. [DOI: 10.1093/eurheartj/eht221] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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170
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Zhang MJ, Qiao B, Xu XB, Zhang JZ. Development and application of a real-time polymerase chain reaction method for Campylobacter jejuni detection. World J Gastroenterol 2013; 19:3090-3095. [PMID: 23716989 PMCID: PMC3662949 DOI: 10.3748/wjg.v19.i20.3090] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 03/07/2013] [Accepted: 04/10/2013] [Indexed: 02/06/2023] Open
Abstract
AIM: To develop a real-time polymerase chain reaction (PCR) method to detect and quantify Campylobacter jejuni (C. jejuni) from stool specimens.
METHODS: Primers and a probe for real-time PCR were designed based on the specific DNA sequence of the hipO gene in C. jejuni. The specificity of the primers and probe were tested against a set of Campylobacter spp. and other enteric pathogens. The optimal PCR conditions were determined by testing a series of conditions with standard a C. jejuni template. The detection limits were obtained using purified DNA from bacterial culture and extracted DNA from the stool specimen. Two hundred and forty-two specimens were analyzed for the presence of C. jejuni by direct bacterial culture and real-time PCR.
RESULTS: The optimal PCR system was determined using reference DNA templates, 1 × uracil-DNA glycosylase, 3.5 mmol/L MgCl2, 1.25 U platinum Taq polymerase, 0.4 mmol/L PCR nucleotide mix, 0.48 μmol/L of each primer, 0.2 μmol/L of probe and 2 μL of DNA template in a final volume of 25 μL. The PCR reaction was carried as follows: 95 °C for 4 min, followed by 45 cycles of 10 s at 95 °C and 30 s at 59 °C. The detection limit was 4.3 CFU/mL using purified DNA from bacterial culture and 103 CFU/g using DNA from stool specimens. Twenty (8.3%, 20/242) C. jejuni strains were isolated from bacterial culture, while 41 (16.9%, 41/242) samples were found to be positive by real-time PCR. DNA sequencing of the PCR product indicated the presence of C. jejuni in the specimen. One mixed infection of C. jejuni and Salmonella was detected in one specimen and the PCR test for this specimen was positive.
CONCLUSION: The sensitivity of detection of C. jejuni from stool specimens was much higher using this PCR assay than using the direct culture method.
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171
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Xiong X, Song F, Chen G, Sun W, Wang J, Gao P, Zhang Y, Qiao B, Li W, Sun S, Fan J, Peng X. Construction of long-wavelength fluorescein analogues and their application as fluorescent probes. Chemistry 2013; 19:6538-45. [PMID: 23589345 DOI: 10.1002/chem.201300418] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Indexed: 12/22/2022]
Abstract
Born to dye: Five fluorescein analogues were synthesised (see scheme). One analogue was found to emit in the NIR region with a high quantum yield, excellent photostability and good permeability. Three derivatives were found to specifically stain mitochondria and one dye responds to thiols with a strong turn-on NIR fluorescence signal and colorimetric change, in vitro and in vivo.
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Affiliation(s)
- Xiaoqing Xiong
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116025, PR China
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172
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Li WC, Jiang DM, Hu N, Qi XT, Qiao B, Luo XJ. Lipopolysaccharide preconditioning attenuates neuroapoptosis and improves functional recovery through activation of Nrf2 in traumatic spinal cord injury rats. Int J Neurosci 2013; 123:240-7. [DOI: 10.3109/00207454.2012.755181] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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173
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Qiao B, Foord ME, Wei MS, Stephens RB, Key MH, McLean H, Patel PK, Beg FN. Dynamics of high-energy proton beam acceleration and focusing from hemisphere-cone targets by high-intensity lasers. Phys Rev E Stat Nonlin Soft Matter Phys 2013; 87:013108. [PMID: 23410447 DOI: 10.1103/physreve.87.013108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Indexed: 06/01/2023]
Abstract
Acceleration and focusing of high-energy proton beams from fast-ignition (FI) -related hemisphere-cone assembled targets have been numerically studied by hybrid particle-in-cell simulations and compared with those from planar-foil and open-hemisphere targets. The whole physical process including the laser-plasma interaction has been self-consistently modeled for 15 ps, at which time the protons reach asymptotic motion. It is found that the achievable focus of proton beams is limited by the thermal pressure gradients in the co-moving hot electrons, which induce a transverse defocusing electric field that bends proton trajectories near the axis. For the advanced hemisphere-cone target, the flow of hot electrons along the cone wall induces a local transverse focusing sheath field, resulting in a clear enhancement in proton focusing; however, it leads to a significant loss of longitudinal sheath potential, reducing the total conversion efficiency from laser to protons.
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Affiliation(s)
- B Qiao
- Center for Energy Research, University of California San Diego, La Jolla, California 92093, USA.
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174
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Li H, Liu F, Sun S, Wang J, Li Z, Mu D, Qiao B, Peng X. Interaction of Ru(phen)3Cl2 with graphene oxide and its application for DNA detection both in vitro and in vivo. J Mater Chem B 2013; 1:4146-4151. [DOI: 10.1039/c3tb20858c] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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175
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Jiang N, Fan J, Liu T, Cao J, Qiao B, Wang J, Gao P, Peng X. A near-infrared dye based on BODIPY for tracking morphology changes in mitochondria. Chem Commun (Camb) 2013; 49:10620-2. [DOI: 10.1039/c3cc46143b] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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176
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Wang Z, Zhang X, Wang R, Kang H, Qiao B, Ma J, Zhang L, Wang H. Synthesis and Characterization of Novel Soybean-Oil-Based Elastomers with Favorable Processability and Tunable Properties. Macromolecules 2012. [DOI: 10.1021/ma301938a] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhao Wang
- State Key Laboratory of Organic−Inorganic
Composites, Beijing University of Chemical Technology, Beijing 100029, P R China
| | - Xing Zhang
- State Key Laboratory of Organic−Inorganic
Composites, Beijing University of Chemical Technology, Beijing 100029, P R China
| | - Runguo Wang
- State Key Laboratory of Organic−Inorganic
Composites, Beijing University of Chemical Technology, Beijing 100029, P R China
| | - Hailan Kang
- State Key Laboratory of Organic−Inorganic
Composites, Beijing University of Chemical Technology, Beijing 100029, P R China
| | - Bo Qiao
- State Key Laboratory of Organic−Inorganic
Composites, Beijing University of Chemical Technology, Beijing 100029, P R China
| | - Jun Ma
- School
of Advanced Manufacturing
and Mechanical Engineering, University of South Australia, SA5095, Australia
| | - Liqun Zhang
- State Key Laboratory of Organic−Inorganic
Composites, Beijing University of Chemical Technology, Beijing 100029, P R China
- Key Laboratory of Beijing City
on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing
100029, P R China
| | - Hao Wang
- Centre
of Excellence in Engineered
Fibre Composites and Faculty of Engineering, University of Southern Queensland, Qld 4350, Australia
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177
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Kar S, Kakolee KF, Qiao B, Macchi A, Cerchez M, Doria D, Geissler M, McKenna P, Neely D, Osterholz J, Prasad R, Quinn K, Ramakrishna B, Sarri G, Willi O, Yuan XY, Zepf M, Borghesi M. Ion acceleration in multispecies targets driven by intense laser radiation pressure. Phys Rev Lett 2012; 109:185006. [PMID: 23215290 DOI: 10.1103/physrevlett.109.185006] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Indexed: 06/01/2023]
Abstract
The acceleration of ions from ultrathin foils has been investigated by using 250 TW, subpicosecond laser pulses, focused to intensities of up to 3 × 10(20) W cm(-2). The ion spectra show the appearance of narrow-band features for protons and carbon ions peaked at higher energies (in the 5-10 MeV/nucleon range) and with significantly higher flux than previously reported. The spectral features and their scaling with laser and target parameters provide evidence of a multispecies scenario of radiation pressure acceleration in the light sail mode, as confirmed by analytical estimates and 2D particle-in-cell simulations. The scaling indicates that monoenergetic peaks with more than 100 MeV/nucleon are obtainable with moderate improvements of the target and laser characteristics, which are within reach of ongoing technical developments.
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Affiliation(s)
- S Kar
- Centre for Plasma Physics, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, United Kingdom.
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178
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Zhang M, Meng F, Cao F, Qiao B, Liu G, Liu H, Zhou Y, Dong H, Gu Y, Xiao D, Zhang Y, Zhang J. Cloning, expression, and antigenicity of 14 proteins from Campylobacter jejuni. Foodborne Pathog Dis 2012; 9:706-12. [PMID: 22779748 DOI: 10.1089/fpd.2011.1122] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Fourteen Campylobacter jejuni genes--porA, cadF, omp18, dnaK, flaC, peb1, peb2, peb3, peb4, ahpC, groEL, tuF, hipO, and Cj0069--were cloned and expressed in Escherichia coli BL21. The recombinant proteins were purified on histidine (His) and glutathione S-transferase (GST) trap columns using the ÄKTA Explorer 100 System. Recombinant proteins were visualized using sodium dodecyl sulfate-polyacrylamide gel electrophoresis and identified using matrix-assisted laser desorption ionization time-of-flight mass spectrometry. The antigenicities of these recombinant proteins were assessed by Western blotting and enzyme-linked immunosorbent assays with anti-C. jejuni immune rabbit sera. Four recombinant proteins, including rGST-PorA, rHis-CadF, rGST-GroEL, and rGST-TuF, demonstrated reactions with both anti-serum and preimmune serum, while rHis-DnaK, rGST-FlaC, rGST-PEB2, rGST-PEB3, rGST-PEB4, and rGST-HipO showed variable antigenicity characteristics to the anti-sera derived from different C. jejuni strains. rHis-Omp18, rHis-PEB1, and rGST-AhpC demonstrated universal and specific antigenities with the entire anti-sera panel tested in this present study, while recombinant rGST-Cj0069 and rHis-DnaK did not react with any of the anti-C. jejuni sera tested. In conclusion, rGST-AhpC may be useful as a potential serodiagnostic antigen for C. jejuni infection.
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Affiliation(s)
- Maojun Zhang
- National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.
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179
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Qiao B, Sugianto P, Fung E, Del-Castillo-Rueda A, Moran-Jimenez MJ, Ganz T, Nemeth E. Hepcidin-induced endocytosis of ferroportin is dependent on ferroportin ubiquitination. Cell Metab 2012; 15:918-24. [PMID: 22682227 PMCID: PMC3372862 DOI: 10.1016/j.cmet.2012.03.018] [Citation(s) in RCA: 224] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Revised: 02/09/2012] [Accepted: 03/20/2012] [Indexed: 12/14/2022]
Abstract
Ferroportin exports iron into plasma from absorptive enterocytes, erythrophagocytosing macrophages, and hepatic stores. The hormone hepcidin controls cellular iron export and plasma iron concentrations by binding to ferroportin and causing its internalization and degradation. We explored the mechanism of hepcidin-induced endocytosis of ferroportin, the key molecular event in systemic iron homeostasis. Hepcidin binding caused rapid ubiquitination of ferroportin in cell lines overexpressing ferroportin and in murine bone marrow-derived macrophages. No hepcidin-dependent ubiquitination was observed in C326S ferroportin mutant which does not bind hepcidin. Substitutions of lysines between residues 229 and 269 in the third cytoplasmic loop of ferroportin prevented hepcidin-dependent ubiquitination and endocytosis of ferroportin, and promoted cellular iron export even in the presence of hepcidin. The human ferroportin mutation K240E, previously associated with clinical iron overload, caused hepcidin resistance in vitro by interfering with ferroportin ubiquitination. Our study demonstrates that ubiquitination is the functionally relevant signal for hepcidin-induced ferroportin endocytosis.
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Affiliation(s)
- Bo Qiao
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
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180
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Qiao B, Kar S, Geissler M, Gibbon P, Zepf M, Borghesi M. Dominance of radiation pressure in ion acceleration with linearly polarized pulses at intensities of 10(21) W cm(-2). Phys Rev Lett 2012; 108:115002. [PMID: 22540479 DOI: 10.1103/physrevlett.108.115002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Indexed: 05/31/2023]
Abstract
A novel regime is proposed where, by employing linearly polarized laser pulses at intensities 10(21) W cm(-2) (2 orders of magnitude lower than discussed in previous work [T. Esirkepov et al., Phys. Rev. Lett. 92, 175003 (2004)]), ions are dominantly accelerated from ultrathin foils by the radiation pressure and have monoenergetic spectra. In this regime, ions accelerated from the hole-boring process quickly catch up with the ions accelerated by target normal sheath acceleration, and they then join in a single bunch, undergoing a hybrid light-sail-target normal sheath acceleration. Under an appropriate coupling condition between foil thickness, laser intensity, and pulse duration, laser radiation pressure can be dominant in this hybrid acceleration. Two-dimensional particle-in-cell simulations show that 1.26 GeV quasimonoenergetic C(6+) beams are obtained by linearly polarized laser pulses at intensities of 10(21) W cm(-2).
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Affiliation(s)
- B Qiao
- School of Mathematics and Physics, Queen's University Belfast, Belfast, United Kingdom
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181
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Preza GC, Ruchala P, Pinon R, Ramos E, Qiao B, Peralta MA, Sharma S, Waring A, Ganz T, Nemeth E. Minihepcidins are rationally designed small peptides that mimic hepcidin activity in mice and may be useful for the treatment of iron overload. J Clin Invest 2012; 121:4880-8. [PMID: 22045566 DOI: 10.1172/jci57693] [Citation(s) in RCA: 165] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Accepted: 09/21/2011] [Indexed: 02/06/2023] Open
Abstract
Iron overload is the hallmark of hereditary hemochromatosis and a complication of iron-loading anemias such as β-thalassemia. Treatment can be burdensome and have significant side effects, and new therapeutic options are needed. Iron overload in hereditary hemochromatosis and β-thalassemia intermedia is caused by hepcidin deficiency. Although transgenic hepcidin replacement in mouse models of these diseases prevents iron overload or decreases its potential toxicity, natural hepcidin is prohibitively expensive for human application and has unfavorable pharmacologic properties. Here, we report the rational design of hepcidin agonists based on the mutagenesis of hepcidin and the hepcidin-binding region of ferroportin and computer modeling of their docking. We identified specific hydrophobic/aromatic residues required for hepcidin-ferroportin binding and obtained evidence in vitro that a thiol-disulfide interaction between ferroportin C326 and the hepcidin disulfide cage may stabilize binding. Guided by this model, we showed that 7–9 N-terminal amino acids of hepcidin, including a single thiol cysteine, comprised the minimal structure that retained hepcidin activity, as shown by the induction of ferroportin degradation in reporter cells. Further modifications to increase resistance to proteolysis and oral bioavailability yielded minihepcidins that, after parenteral or oral administration to mice, lowered serum iron levels comparably to those after parenteral native hepcidin. Moreover, liver iron concentrations were lower in mice chronically treated with minihepcidins than those in mice treated with solvent alone. Minihepcidins may be useful for the treatment of iron overload disorders.
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Affiliation(s)
- Gloria C Preza
- Department of Pathology, UCLA, Los Angeles, California, USA
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182
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Qiao B, Zhao X, Yue D, Zhang L, Wu S. A combined experiment and molecular dynamics simulation study of hydrogen bonds and free volume in nitrile-butadiene rubber/hindered phenol damping mixtures. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31716h] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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183
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Ren XS, Zhang CH, Qiao B. [Case of moyamoya disease]. Zhongguo Zhen Jiu 2011; 31:842. [PMID: 21972643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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184
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Borghesi M, Kar S, Prasad R, Kakolee FK, Quinn K, Ahmed H, Sarri G, Ramakrishna B, Qiao B, Geissler M, Ter-Avetisyan S, Zepf M, Schettino G, Stevens B, Tolley M, Ward A, Green J, Foster PS, Spindloe C, Gallegos P, Robinson AL, Neely D, Carroll DC, Tresca O, Yuan X, Quinn M, McKenna P, Dover N, Palmer C, Schreiber J, Najmudin Z, Sari I, Kraft M, Merchant M, Jeynes JC, Kirkby K, Fiorini F, Kirby D, Green S. Ion source development and radiobiology applications within the LIBRA project. ACTA ACUST UNITED AC 2011. [DOI: 10.1117/12.888262] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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185
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Qiao B, Zhang CH, Xing H. [Case of radiation-induced xerostomia]. Zhongguo Zhen Jiu 2011; 31:420. [PMID: 21692288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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186
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He LH, Zhang MJ, Liu GD, Zhang HF, Qiao B, Zhang JZ. Comparison of Karmali agar medium and Columbia agar medium for isolation of Helicobacter pylori from gastric biopsy specimens. Shijie Huaren Xiaohua Zazhi 2011; 19:98-101. [DOI: 10.11569/wcjd.v19.i1.98] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To compare the isolation rates of the Helicobacter pylori (H.pylori) from gastric biopsy specimens achieved using Karmali and Columbia agar media.
METHODS: Gastric biopsy specimens were collected from 168 H.pylori-positive patients and cultivated on Karmali and Columbia agar plates under microaerophilic conditions (5% O2, 10% CO2, and 85% N2). Single colonies of H.pylori were identified by biochemical test and PCR. The isolation rates of H.pylori achieved using the two types of media at 24, 48, 72, and 96 h were compared.
RESULTS: There was no significant difference in the isolation rate between Karmali and Columbia agar at 24 h (P = 0.125). In contrast, the isolation rates achieved using Karmali agar at 48, 72 and 96 h were significantly higher than those using Columbia agar (82.1% vs 45.8%, 94.6% vs 79.2%, 97.0% vs 88.7%, all P < 0.05).
CONCLUSION: Higher isolation rate of H.pylori from gastric biopsy specimens was achieved with Karmali agar than with Columbia agar. Karmali agar can be used as an effective medium for isolation of H.pylori from gastric biopsy specimens.
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187
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Wang F, Li Z, Qiao B. Rapid analysis of iron concentrates by x-ray fluorescence spectrometry with sol-gel sample preparation technology. J Xray Sci Technol 2011; 19:417-421. [PMID: 21876289 DOI: 10.3233/xst-2011-0301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A rapid method for the analysis of iron concentrates by gel sample preparation and x-ray fluorescence (XRF) spectrometry detection was developed. The solution digested by aqua regia was mixed with agarose, and then agarose was dissolved in the boiling solution and the mixture became quasi-solid gel at ambient temperature. The quasi-solid gel was detected by XRF. Analytical characteristics of the methods used were compared, and their reliability were tested against several certified reference materials of iron concentrates. The relative standard deviation was less than 0.3%.
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Affiliation(s)
- Fang Wang
- Department of Chemistry and Chemical Engineering, Shaanxi Institute of Education, Xi'an, China.
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188
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Qiao B, Zepf M, Borghesi M, Dromey B, Geissler M, Karmakar A, Gibbon P. Radiation-pressure acceleration of ion beams from nanofoil targets: the leaky light-sail regime. Phys Rev Lett 2010; 105:155002. [PMID: 21230914 DOI: 10.1103/physrevlett.105.155002] [Citation(s) in RCA: 5] [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: 03/31/2010] [Indexed: 05/30/2023]
Abstract
A new ion radiation-pressure acceleration regime, the "leaky light sail," is proposed which uses sub-skin-depth nanometer foils irradiated by circularly polarized laser pulses. In the regime, the foil is partially transparent, continuously leaking electrons out along with the transmitted laser field. This feature can be exploited by a multispecies nanofoil configuration to stabilize the acceleration of the light ion component, supplementing the latter with an excess of electrons leaked from those associated with the heavy ions to avoid Coulomb explosion. It is shown by 2D particle-in-cell simulations that a monoenergetic proton beam with energy 18 MeV is produced by circularly polarized lasers at intensities of just 10¹⁹ W/cm². 100 MeV proton beams are obtained by increasing the intensities to 2 × 10²⁰ W/cm².
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Affiliation(s)
- B Qiao
- Jülich Supercomputing Center, Forschungzentrum Jülich GmbH, D-52425, Jülich, Germany
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189
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190
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Ke B, Shen XD, Gao F, Qiao B, Ji H, Busuttil RW, Volk HD, Kupiec-Weglinski JW. Small interfering RNA targeting heme oxygenase-1 (HO-1) reinforces liver apoptosis induced by ischemia-reperfusion injury in mice: HO-1 is necessary for cytoprotection. Hum Gene Ther 2010; 20:1133-42. [PMID: 19534599 DOI: 10.1089/hum.2009.049] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
We have shown that overexpression of heme oxygenase-1 (HO-1) prevents the liver inflammation response leading to ischemia and reperfusion injury (IRI). This study was designed to explore the precise function and mechanism of HO-1 cytoprotection in liver IRI by employing a small interfering RNA (siRNA) that effectively suppresses HO-1 expression both in vitro and in vivo. Using a partial lobar liver warm ischemia model, mice were injected with HO-1 siRNA/nonspecific control siRNA or Ad-HO-1/Ad-beta-gal. Those treated with HO-1 siRNA showed increased serum glutamic-oxaloacetic transaminase levels, significant liver edema, sinusoidal congestion/cytoplasmic vacuolization, and severe hepatocellular necrosis. In contrast, Ad-HO-1-pretreated animals revealed only minimal sinusoidal congestion without edema/vacuolization or necrosis. Administration of HO-1 siRNA significantly increased local neutrophil accumulation and the frequency of apoptotic cells. Mice treated with HO-1 siRNA were characterized by increased caspase-3 activity and reduced HO-1 expression, whereas those given Ad-HO-1 showed decreased caspase-3 activity and increased HO-1/Bcl-2/Bcl-x(L), data confirmed by use of an in vitro cell culture system. Thus, by using an siRNA approach this study confirms that HO-1 provides potent cytoprotection against hepatic IRI and regulates liver apoptosis. Indeed, siRNA provides a powerful tool with which to study gene function in a wide range of liver diseases.
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Affiliation(s)
- Bibo Ke
- Dumont-UCLA Transplant Center, Department of Surgery, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA
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191
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Ke B, Shen XD, Gao F, Ji H, Qiao B, Zhai Y, Farmer DG, Busuttil RW, Kupiec-Weglinski JW. Adoptive transfer of ex vivo HO-1 modified bone marrow-derived macrophages prevents liver ischemia and reperfusion injury. Mol Ther 2009; 18:1019-25. [PMID: 20029397 DOI: 10.1038/mt.2009.285] [Citation(s) in RCA: 36] [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: 12/17/2022] Open
Abstract
Macrophages play a critical role in the pathophysiology of liver ischemia and reperfusion (IR) injury (IRI). However, macrophages that overexpress antioxidant heme oxygenase-1 (HO-1) may exert profound anti-inflammatory functions. This study explores the cytoprotective effects and mechanisms of ex vivo modified HO-1-expressing bone marrow-derived macrophages (BMDMs) in well-defined mouse model of liver warm ischemia followed by reperfusion. Adoptive transfer of Ad-HO-1-transduced macrophages prevented IR-induced hepatocellular damage, as evidenced by depressed serum glutamic-oxaloacetic transaminase (sGOT) levels and preserved liver histology (Suzuki scores), compared to Ad-beta-gal controls. This beneficial effect was reversed following concomitant treatment with HO-1 siRNA. Ad-HO-1-transfected macrophages significantly decreased local neutrophil accumulation, TNF-alpha/IL-1beta, IFN-gamma/E-selectin, and IP-10/MCP-1 expression, caspase-3 activity, and the frequency of apoptotic cells, as compared with controls. Unlike in controls, Ad-HO-1-transfected macrophages markedly increased hepatic expression of antiapoptotic Bcl-2/Bcl-xl and depressed caspase-3 activity. These results establish the precedent for a novel investigative tool and provide the rationale for a clinically attractive new strategy in which native macrophages can be transfected ex vivo with cytoprotective HO-1 and then infused, if needed, to prospective recipients exposed to hepatic IR-mediated local inflammation, such as during liver transplantation, resection, or trauma.
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Affiliation(s)
- Bibo Ke
- Department of Surgery, David Geffen School of Medicine at UCLA, Dumont-UCLA Transplant Center, Los Angeles, California, USA
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192
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Huang CH, Cong L, Xie J, Qiao B, Lo SH, Zheng T. Rheumatoid arthritis-associated gene-gene interaction network for rheumatoid arthritis candidate genes. BMC Proc 2009; 3 Suppl 7:S75. [PMID: 20018070 PMCID: PMC2795977 DOI: 10.1186/1753-6561-3-s7-s75] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [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] [Indexed: 11/25/2022] Open
Abstract
Rheumatoid arthritis (RA, MIM 180300) is a chronic and complex autoimmune disease. Using the North American Rheumatoid Arthritis Consortium (NARAC) data set provided in Genetic Analysis Workshop 16 (GAW16), we used the genotype-trait distortion (GTD) scores and proposed analysis procedures to capture the gene-gene interaction effects of multiple susceptibility gene regions on RA. In this paper, we focused on 27 RA candidate gene regions (531 SNPs) based on a literature search. Statistical significance was evaluated using 1000 permutations. HLADRB1 was found to have strong marginal association with RA. We identified 14 significant interactions (p < 0.01), which were aggregated into an association network among 12 selected candidate genes PADI4, FCGR3, TNFRSF1B, ITGAV, BTLA, SLC22A4, IL3, VEGF, TNF, NFKBIL1, TRAF1-C5, and MIF. Based on our and other contributors' findings during the GAW16 conference, we further studied 24 candidate regions with 336 SNPs. We found 23 significant interactions (p-value < 0.01), nine interactions in addition to our initial findings, and the association network was extended to include candidate genes HLA-A, HLA-B, HLA-C, CTLA4, and IL6. As we will discuss in this paper, the reported possible interactions between genes may suggest potential biological activities of RA.
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Affiliation(s)
- Chien-Hsun Huang
- Department of Statistics, Columbia University, 1255 Amsterdam Avenue, 10th Floor, MC44690, New York, New York 10027, USA.
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193
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Qiao B, Huang CH, Cong L, Xie J, Lo SH, Zheng T. Genome-wide gene-based analysis of rheumatoid arthritis-associated interaction with PTPN22 and HLA-DRB1. BMC Proc 2009; 3 Suppl 7:S132. [PMID: 20017999 PMCID: PMC2795906 DOI: 10.1186/1753-6561-3-s7-s132] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [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] [Indexed: 01/02/2023] Open
Abstract
The genes PTPN22 and HLA-DRB1 have been found by a number of studies to confer an increased risk for rheumatoid arthritis (RA), which indicates that both genes play an important role in RA etiology. It is believed that they not only have strong association with RA individually, but also interact with other related genes that have not been found to have predisposing RA mutations. In this paper, we conduct genome-wide searches for RA-associated gene-gene interactions that involve PTPN22 or HLA-DRB1 using the Genetic Analysis Workshop 16 Problem 1 data from the North American Rheumatoid Arthritis Consortium. MGC13017, HSPCAL3, MIA, PTPNS1L, and IGLVI-70, which showed association with RA in previous studies, have been confirmed in our analysis.
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Affiliation(s)
- Bo Qiao
- Department of Statistics, Columbia University, 1255 Amsterdam Avenue, 10th Floor, MC4690, New York, New York 10027, USA.
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194
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Liu J, Zhang G, Meng Z, Qiao B. Determination of Trace Nickel in Hydrogenated Cottonseed Oil by Pressurized Bomb Acid Digestion and Graphite Furnace Atomic Absorption Spectrometry Detection. J AM OIL CHEM SOC 2009. [DOI: 10.1007/s11746-009-1424-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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195
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Qiao B, Zepf M, Borghesi M, Geissler M. Stable GeV ion-beam acceleration from thin foils by circularly polarized laser pulses. Phys Rev Lett 2009; 102:145002. [PMID: 19392446 DOI: 10.1103/physrevlett.102.145002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2008] [Indexed: 05/27/2023]
Abstract
A stable relativistic ion acceleration regime for thin foils irradiated by circularly polarized laser pulses is suggested. In this regime, the "light-sail" stage of radiation pressure acceleration for ions is smoothly connected with the initial relativistic "hole-boring" stage, and a defined relationship between laser intensity I0, foil density n{0}, and thickness l{0} should be satisfied. For foils with a wide range of n{0}, the required I0 and l{0} for the regime are theoretically estimated and verified with the particle-in-cell code ILLUMINATION. It is shown for the first time by 2D simulations that high-density monoenergetic ion beams with energy above GeV/u and divergence of 10 degrees are produced by circularly polarized lasers at intensities of 10;{22} W/cm;{2}, which are within reach of current laser systems.
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Affiliation(s)
- B Qiao
- Center for Plasma Physics, Department of Physics and Astronomy, Queen's University Belfast, Belfast BT7 1NN, United Kingdom
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196
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Zhai Y, Qiao B, Gao F, Shen X, Vardanian A, Busuttil RW, Kupiec-Weglinski JW. Type I, but not type II, interferon is critical in liver injury induced after ischemia and reperfusion. Hepatology 2008; 47:199-206. [PMID: 17935177 DOI: 10.1002/hep.21970] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We have documented the key role of toll-like receptor 4 (TLR4) activation and its signaling pathway mediated by interferon (IFN) regulatory factor 3, in the induction of inflammation leading to the hepatocellular damage during liver ischemia/reperfusion injury (IRI). Because type I IFN is the major downstream activation product of that pathway, we studied its role in comparison with IFN-gamma. Groups of type I (IFNAR), type II (IFNGR) IFN receptor-deficient mice, along with wild-type (WT) controls were subjected to partial liver warm ischemia (90 minutes) followed by reperfusion (1-6 hours). Interestingly, IFNAR knockout (KO) but not IFNGR KO mice were protected from IR-induced liver damage, as evidenced by decreased serum alanine aminotransferase and preservation of tissue architecture. IR-triggered intrahepatic pro-inflammatory response, assessed by tumor necrosis factor (TNF-alpha), interleukin 6 (IL-6), and chemokine (C-X-C motif) ligand 10 (CXCL-10) expression, was diminished selectively in IFNAR KO mice. Consistent with these findings, our in vitro cell culture studies have shown that: (1) although hepatocytes alone failed to respond to lipopolysaccharide (LPS), when co-cultured with macrophages they did respond to LPS via macrophage-derived IFN-beta; (2) macrophages required type I IFN to sustain CXCL10 production in response to LPS. This study documents that type I, but not type II, IFN pathway is required for IR-triggered liver inflammation/damage. Type I IFN mediates potential synergy between nonparenchyma and parenchyma cells in response to TLR4 activation.
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Affiliation(s)
- Yuan Zhai
- Dumont-UCLA Transplant Center, Department of Surgery, Division of Liver and Pancreas Transplantation, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-7054, USA
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197
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Fan Y, Chen H, Qiao B, Luo L, Ma H, Li H, Jiang J, Niu D, Yin Z. Opposing effects of ERK and p38 MAP kinases on HeLa cell apoptosis induced by dipyrithione. Mol Cells 2007; 23:30-8. [PMID: 17464209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2023] Open
Abstract
Dipyrithione (2, 2'-dithiobispyridine-1, 1'-dioxide, PTS2), a pyrithione derivate, is highly bactericidal and fungicidal. In this study we examined its apoptotic effect on HeLa cells. PTS2 induced HeLa cell death in a dose and time dependent manner. ERK1/2 and p38 were markedly activated, but little JNK1/2 activation was detected. Suppression of p38 activation by SB203580 reduced the extent of apoptosis of the HeLa cells and also prevented induction of p21, release of cytochrome c, and cleavage of caspase-3 and PARP. Inhibition of ERK1/2 with PD98059 increased apoptosis, indicating that ERK1/2 activation has an anti-apoptotic effect on PTS2-induced HeLa cell apoptosis. PTS2 also inhibited murine sarcoma 180 and hepatoma 22 tumor growth in an animal tumor model. Our findings indicate that PTS2 possesses anti-tumor activity, that caspase-3 and poly (ADP-ribose) polymerase (PARP) are involved in PTS2-induced HeLa cell apoptosis and that ERK1/2 and p38 have opposing effects on this apoptosis.
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Affiliation(s)
- Yumei Fan
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing 210097, PR China
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198
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Fan Y, Chen H, Qiao B, Liu Z, Luo L, Wu Y, Yin Z. c-Jun NH2-terminal kinase decreases ubiquitination and promotes stabilization of p21(WAF1/CIP1) in K562 cell. Biochem Biophys Res Commun 2007; 355:263-8. [PMID: 17292858 DOI: 10.1016/j.bbrc.2007.01.146] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2007] [Accepted: 01/29/2007] [Indexed: 01/28/2023]
Abstract
Proteasome-dependent degradation of regulatory proteins is a known mechanism of cell cycle control. p21(WAF1/CIP1) (p21), a negative regulator of the cell division cycle, exhibits proteasome-sensitive turnover and ubiquitination. In the present study, we analyzed the regulatory effects of JNK1 on p21 protein accumulation in p53 null K562 cells. We found that JNK1 (wild type, WT) mediated H(2)O(2)-induced p21 protein up-regulation. Over-expression of JNK1 (WT) could elevate endogenous p21 protein level but did not affect p21 mRNA level and also prolong the p21 half-life as well as inhibited the p21 ubiquitination. These findings indicated that JNK1 could regulate cellular p21 level via inhibiting ubiquitination of p21, which provided a new insight for analyzing the regulatory effect of JNK after stress.
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Affiliation(s)
- Yumei Fan
- Jiangsu Province Key Laboratory for Molecular and Medical Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210097, PR China
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199
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Tsuchihashi S, Kaldas F, Chida N, Sudo Y, Tamura K, Zhai Y, Qiao B, Busuttil RW, Kupiec-Weglinski JW. FK330, a novel inducible nitric oxide synthase inhibitor, prevents ischemia and reperfusion injury in rat liver transplantation. Am J Transplant 2006; 6:2013-22. [PMID: 16796718 DOI: 10.1111/j.1600-6143.2006.01435.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [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] [Indexed: 02/06/2023]
Abstract
Nitric oxide (NO), produced via inducible NO synthase (iNOS), is implicated in the pathophysiology of liver ischemia/reperfusion injury (IRI). We examined the effects of a novel iNOS inhibitor, FK330 (FR260330), in well-defined rat liver IRI models. In a model of liver cold ischemia followed by ex vivo reperfusion, treatment with FK330 improved portal venous flow, increased bile production and decreased hepatocellular damage. FK330 prevented IRI in rat model of 40-h cold ischemia followed by syngeneic orthotopic liver transplantation (OLT), as evidenced by: (1) increased OLT survival (from 20% to 80%); (2) decreased hepatocellular damage (serum glutamic oxaloacetic transaminase/glutamic pyruvic transaminase levels); (3) improved histological features of IRI; (4) reduced intrahepatic leukocyte infiltration, as evidenced by decreased expression of P-selectin/intracellular adhesion molecule 1, ED-1/CD3 cells and neutrophils; (5) depressed lymphocyte activation, as evidenced by expression of pro-inflammatory cytokine (TNF-alpha, IL-1beta, IL-6) and chemokine (IP-10, MCP-1, MIP-2) programs; (6) prevented hepatic apoptosis and down-regulated Bax/Bcl-2 ratio. Thus, by modulating leukocyte trafficking and cell activation patterns, treatment of rats with FK330, a specific iNOS inhibitor, prevented liver IRI. These results provide the rationale for novel therapeutic approaches to maximize organ donor pool through the safer use of liver grafts despite prolonged periods of cold ischemia.
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Affiliation(s)
- S Tsuchihashi
- The Dumont-UCLA Transplant Center, Division of Liver and Pancreas Transplantation, Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, California, USA
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200
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Zhai Y, Shen XD, Hancock WW, Gao F, Qiao B, Lassman C, Belperio JA, Strieter RM, Busuttil RW, Kupiec-Weglinski JW. CXCR3+CD4+ T cells mediate innate immune function in the pathophysiology of liver ischemia/reperfusion injury. J Immunol 2006; 176:6313-22. [PMID: 16670343 DOI: 10.4049/jimmunol.176.10.6313] [Citation(s) in RCA: 47] [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] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Ischemia-reperfusion injury (IRI), an innate immune-dominated inflammatory response, develops in the absence of exogenous Ags. The recently highlighted role of T cells in IRI raises a question as to how T lymphocytes interact with the innate immune system and function with no Ag stimulation. This study dissected the mechanism of innate immune-induced T cell recruitment and activation in rat syngeneic orthotopic liver transplantation (OLT) model. Liver IRI was induced after cold storage (24-36 h) at 4 degrees C in University of Wisconsin solution. Gene products contributing to IRI were identified by cDNA microarray at 4-h posttransplant. IRI triggered increased intrahepatic expression of CXCL10, along with CXCL9 and 11. The significance of CXCR3 ligand induction was documented by the ability of neutralizing anti-CXCR3 Ab treatment to ameliorate hepatocellular damage and improve 14-day survival of 30-h cold-stored OLTs (95 vs 40% in controls; p < 0.01). Immunohistology analysis confirmed reduced CXCR3+ and CD4+ T cell infiltration in OLTs after treatment. Interestingly, anti-CXCR3 Ab did not suppress innate immune activation in the liver, as evidenced by increased levels of IL-1beta, IL-6, inducible NO synthase, and multiple neutrophil/monokine-targeted chemokine programs. In conclusion, this study demonstrates a novel mechanism of T cell recruitment and function in the absence of exogenous Ag stimulation. By documenting that the execution of innate immune function requires CXCR3+CD4+ T cells, it highlights the critical role of CXCR3 chemokine biology for the continuum of innate to adaptive immunity in the pathophysiology of liver IRI.
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Affiliation(s)
- Yuan Zhai
- Department of Surgery, Division of Liver and Pancreas Transplantation, The Dumont-University of California Los Angeles (UCLA) Transplant Center, David Geffen School of Medicine, UCLA, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA
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