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Lim K, Jing K, Song K, Shin S, Kim N, Jeong S, Park H, Dai Y, Yoon W, Hwang B. 1033 POSTER Fat-1 Gene Expression Inhibits Human Cervical Cancer Cells Growth in Vitro and in Vivo. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)70676-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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227
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Chen F, Pan L, Dai Y, Ye H, Liu S, Yu W. Characteristics of expression of goose invariant chain gene and comparison of its structure among different species. Poult Sci 2011; 90:1664-70. [DOI: 10.3382/ps.2010-01336] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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228
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Cheng B, Ling C, Dai Y, Lu Y, Glushakova LG, Gee SWY, McGoogan KE, Aslanidi GV, Park M, Stacpoole PW, Siemann D, Liu C, Srivastava A, Ling C. Development of optimized AAV3 serotype vectors: mechanism of high-efficiency transduction of human liver cancer cells. Gene Ther 2011; 19:375-84. [PMID: 21776025 PMCID: PMC3519243 DOI: 10.1038/gt.2011.105] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Our recent studies have revealed that among the 10 different commonly used adeno-associated virus (AAV) serotypes, AAV3 vectors transduce human liver cancer cells extremely efficiently because these cells express high levels of human hepatocyte growth factor receptor (hHGFR), and AAV3 utilizes hHGFR as a cellular co-receptor for viral entry. In this report, we provide further evidence that both extracellular as well as intracellular kinase domains of hHGFR are involved in AAV3 vector entry and AAV3-mediated transgene expression. We also document that AAV3 vectors are targeted for degradation by the host cell proteasome machinery, and that site-directed mutagenesis of surface-exposed tyrosine (Y) to phenylalanine (F) residues on AAV3 capsids significantly improves the transduction efficiency of Y701F, Y705F and Y731F mutant AAV3 vectors. The transduction efficiency of the Y705+731F double-mutant vector is significantly higher than each of the single mutants in liver cancer cells in vitro. In immunodeficient mouse xenograft models, direct intratumoral injection of AAV3 vectors also led to high-efficiency transduction of human liver tumor cells in vivo. We also document here that the optimized tyrosine-mutant AAV3 vectors lead to increased transduction efficiency following both intratumoral and tail-vein injections in vivo. The optimized tyrosine-mutant AAV3 serotype vectors containing proapoptotic genes should prove useful for the potential gene therapy of human liver cancers.
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Arnold M, Dai Y, Langhans W. A new animal model for intestinal lymph sampling for a new look at intestinal physiology. Appetite 2011. [DOI: 10.1016/j.appet.2011.05.111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Widlowski JL, Pinty B, Clerici M, Dai Y, De Kauwe M, de Ridder K, Kallel A, Kobayashi H, Lavergne T, Ni-Meister W, Olchev A, Quaife T, Wang S, Yang W, Yang Y, Yuan H. RAMI4PILPS: An intercomparison of formulations for the partitioning of solar radiation in land surface models. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010jg001511] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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231
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Wang L, Dai Y, Peng W, Qi S, Ouyang X, Tu Z. Differential expression of serine-threonine kinase receptor-associated protein in patients with systemic lupus erythematosus. Lupus 2011; 20:921-7. [PMID: 21613329 DOI: 10.1177/0961203311399304] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The serine-threonine kinase receptor-associated protein (STRAP), a 39 kDa protein localized predominantly in cytoplasm, is an important inhibitor of transforming growth factor beta (TGF-ß) signaling and a regulator of cell proliferation. To investigate the application of STRAP as a novel biomarker in evaluating the pathological condition of systemic lupus erythematosus (SLE), and to determine the possible involvement of STRAP in SLE pathogenesis, the expression levels of STRAP in peripheral blood mononuclear cells (PBMC) of SLE patients were analyzed. PBMC were collected from six patients with active SLE, six with stable SLE and six healthy controls; after protein extraction and concentration determination, the samples were labeled with reagents for isobaric tagging for relative and absolute protein quantification (iTRAQ) and detected by tandem mass spectrometry. The initial proteomic analysis identified and quantified hundreds of proteins. Of these, STRAP was found to decrease more than three-fold in active SLE patients compared with healthy controls (the relative ratio was 0.291). The under-expression of STRAP in active SLE was further verified by western blot in larger independent sample sets. Clinical data analyses revealed that the levels of STRAP in SLE inversely correlated to the SLE disease activity index (SLEDAI) (r = -0.607, p < 0.05). These results indicate that the under-expression of STRAP may be a negative factor in the pathogenic process of SLE; as a result, this may also be of clinical significance as a potential condition-specific indicator of active SLE.
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Li F, Zhang X, Chen L, Chen H, Liang B, Dai Y, MA G, Zheng J. The best combination treatment of patients with advanced nasopharyngeal carcinoma. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e16018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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233
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Cui YY, Li JH, Dai Y, Liu BX. Prediction of favored and optimized compositions for Cu-Zr-Ni metallic glasses by interatomic potential. J Phys Chem B 2011; 115:4703-8. [PMID: 21473611 DOI: 10.1021/jp200082e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
For the Cu-Zr-Ni system, an interatomic potential was constructed under the newly proposed formulism named smoothed and long-range second-moment approximation of tight-binding. Applying the constructed potential, molecular dynamics simulations were carried out to compare the relative stability of crystalline solid solution versus its disordered counterpart. Simulations not only reveal that the origin of metallic glass formation is the crystalline lattice collapsing while the solute concentrations exceed critical values, but also determine a quadrilateral region, within which the metallic glass formation is energetically favored. Moreover, the energy differences between the crystalline solid solutions and the disordered states were considered as the driving force for amorphization and were computed by molecular static calculations. The calculation results located an optimized composition area with the driving force much greater than those outside. In addition, the alloys around the composition of Cu(16)Zr(60)Ni(24) were identified to have maximum driving force, and the atomic configurations were also analyzed by the Voronoi tessellation method.
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Chen L, Chen H, Zhang X, Ling B, Dai Y, Ma G, Zheng J. P46 Adverse events of nimotuzumab combination therapy in patients with advanced carcinoma. EJC Suppl 2011. [DOI: 10.1016/j.ejcsup.2011.02.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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235
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Sun DS, Zhang JD, Li L, Dai Y, Yu JM, Shao ZY. Accelerated hyperfractionation field-involved re-irradiation combined with concurrent capecitabine chemotherapy for locally recurrent and irresectable rectal cancer. Br J Radiol 2011; 85:259-64. [PMID: 21385917 DOI: 10.1259/bjr/28173562] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES To evaluate the efficacy and treatment-related toxicity of accelerated hyperfractionation field-involved re-irradiation combined with concurrent capecitabine chemotherapy for locally recurrent and irresectable rectal cancer (LRIRC). METHODS 72 patients with LRIRC who underwent the treatment were studied. Three-dimensional conformal accelerated hyperfractionation radiotherapy (3D-CAHRT) was performed and the dose was delivered with a schedule of 1.2 Gy twice daily, with an interval of at least 6 h between fractions, 5 days a week. Concurrent capecitabine chemotherapy was administered twice daily. After 36 Gy in 30 fractions over 3 weeks, patients were evaluated to define the resectability of the disease. If resection was not feasible irradiation was resumed until the total dose administered to the tumour reached 51.6-56.4 Gy. RESULTS Two patients temporarily interrupted concurrent chemoradiation because of Grade IV diarrhoea. The remaining 70 patients completed the planned concurrent chemoradiation. In all patients, the complete response rate was 8.3% and the partial response rate was 51.4%. The overall response rate was 59.7% and clinical benefit rate was 93.1%. Symptomatic responses proved to be obvious and tumour resection was performed in 18 patients. The overall median survival time and median progression-free survival time were 32 and 17 months, respectively. 3 year overall survival and progression-free survival were 45.12% and 31.19%, respectively. Severely acute toxicities included Grade III-IV diarrhoea and granulocytopenia with 9.7% and 8.3% incidence respectively. Small bowel obstruction was severely late toxicity, and the incidence was 1.4%. CONCLUSION Three-dimensional conformal accelerated hyperfractionation field-involved re-irradiation combined with concurrent capecitabine chemotherapy might be an effective and well-tolerated regimen for patients with LRIRC.
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Baluc N, Bailat C, Dai Y, Luppo M, Schaublin R, Victoria M. A Comparison of the microstructure and tensile behaviour of irradiated fcc and bcc metals. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-540-539] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AbstractAs part of an on-going research program, findings are presented from a comparison of the microstructures and associated tensile properties of fcc and bcc materials after high energy proton irradiation, to fluences between 10−4 and 1 dpa, at 300-320 K. Results for this comparison between Cu, Pd, 304 and 316 stainless steel on one side and Fe and the F82H ferritic-martensitic low activation steel on the other are discussed, showing a strong difference in defect accumulation behaviour between the differing crystal structures. The overall deformation behaviour is similar, with an initial localised deformation taking place in all cases, even though the actual deformation mode itself might be different. Furthermore, a comparison is made with some of the materials that have also been irradiated with fission neutrons, showing no influence of the PKA spectra for these irradiation conditions.
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Abstract
AbstractSingle crystalline specimens of pure Pd have been irradiated at ambient temperature with 590 MeV protons to doses ranging between 10−4 and 10−1 dpa. Tensile deformation experiments revealed that irradiation induces hardening and embrittlement, while scanning (SEM) and transmission electron microscopy (TEM) observations showed that plastic deformation of specimens irradiated to a dose ≥ 10−2 dpa is strongly localized and yields the creation of slip bands at the macroscopic scale and of defect-free channels at the microscopic level.
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Qiu X, Sun C, Yu W, Lin H, Sun Z, Chen Y, Wang R, Dai Y. Combined Strategy of Mesenchymal Stem Cell Injection With Vascular Endothelial Growth Factor Gene Therapy for the Treatment of Diabetes-Associated Erectile Dysfunction. ACTA ACUST UNITED AC 2011; 33:37-44. [DOI: 10.2164/jandrol.110.012666] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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239
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Hu C, Cong XD, Dai DZ, Zhang Y, Zhang GL, Dai Y. Argirein alleviates diabetic nephropathy through attenuating NADPH oxidase, Cx43, and PERK in renal tissue. Naunyn Schmiedebergs Arch Pharmacol 2011; 383:309-19. [DOI: 10.1007/s00210-010-0593-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2010] [Accepted: 12/17/2010] [Indexed: 12/21/2022]
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240
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Cui YY, Wang TL, Li JH, Dai Y, Liu BX. Thermodynamic calculation and interatomic potential to predict the favored composition region for the Cu–Zr–Al metallic glass formation. Phys Chem Chem Phys 2011; 13:4103-8. [DOI: 10.1039/c0cp01722a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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241
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Liu S, Chen F, Dai Y, Wu C, Ni Q, Yu W. Molecular characterization and tissue-specific expression of invariant chain in the muscovy duck (Cairina moschata). GENETICS AND MOLECULAR RESEARCH 2011; 10:2867-80. [DOI: 10.4238/2011.november.22.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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242
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Wang X, Li J, Peng Y, Dai Y, Shi G, Xu W. Interleukin-2 Receptor Antagonists in Liver Transplantation: A Meta-analysis of Randomized Trials. Transplant Proc 2010; 42:4567-72. [DOI: 10.1016/j.transproceed.2010.09.169] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2010] [Revised: 04/05/2010] [Accepted: 09/30/2010] [Indexed: 01/22/2023]
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243
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Herng TS, Qi DC, Berlijn T, Yi JB, Yang KS, Dai Y, Feng YP, Santoso I, Sánchez-Hanke C, Gao XY, Wee ATS, Ku W, Ding J, Rusydi A. Room-temperature ferromagnetism of Cu-doped ZnO films probed by soft X-ray magnetic circular dichroism. PHYSICAL REVIEW LETTERS 2010; 105:207201. [PMID: 21231259 DOI: 10.1103/physrevlett.105.207201] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Indexed: 05/30/2023]
Abstract
We report direct evidence of room-temperature ferromagnetic ordering in O-deficient ZnO:Cu films by using soft x-ray magnetic circular dichroism and x-ray absorption. Our measurements have revealed unambiguously two distinct features of Cu atoms associated with (i) magnetically ordered Cu ions present only in the oxygen-deficient samples and (ii) magnetically disordered regular Cu2+ ions present in all the samples. We find that a sufficient amount of both oxygen vacancies (V(O)) and Cu impurities is essential to the observed ferromagnetism, and a non-negligible portion of Cu impurities is uninvolved in the magnetic order. Based on first-principles calculations, we propose a microscopic "indirect double-exchange" model, in which alignments of localized large moments of Cu in the vicinity of the V(O) are mediated by the large-sized vacancy orbitals.
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Zhang Y, Dai Y, Liu Y, Ren J. Mandibulofacial dysostosis, microtia, and limb anomalies in a newborn: a new form of acrofacial dysostosis syndrome? Clin Genet 2010; 78:570-4. [DOI: 10.1111/j.1399-0004.2010.01427.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mendicino M, Ramsoondar J, Phelps C, Vaught T, Ball S, LeRoith T, Monahan J, Chen S, Dandro A, Boone J, Jobst P, Vance A, Wertz N, Bergman Z, Sun XZ, Polejaeva I, Butler J, Dai Y, Ayares D, Wells K. Generation of antibody- and B cell-deficient pigs by targeted disruption of the J-region gene segment of the heavy chain locus. Transgenic Res 2010; 20:625-41. [PMID: 20872248 PMCID: PMC7089184 DOI: 10.1007/s11248-010-9444-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Accepted: 09/13/2010] [Indexed: 01/22/2023]
Abstract
A poly(A)-trap gene targeting strategy was used to disrupt the single functional heavy chain (HC) joining region (JH) of swine in primary fibroblasts. Genetically modified piglets were then generated via somatic cell nuclear transfer (SCNT) and bred to yield litters comprising JH wild-type littermate (+/+), JH heterozygous knockout (±) and JH homozygous knockout (−/−) piglets in the expected Mendelian ratio of 1:2:1. There are only two other targeted loci previously published in swine, and this is the first successful poly(A)-trap strategy ever published in a livestock species. In either blood or secondary lymphoid tissues, flow cytometry, RT-PCR and ELISA detected no circulating IgM+ B cells, and no transcription or secretion of immunoglobulin (Ig) isotypes, respectively in JH −/− pigs. Histochemical and immunohistochemical (IHC) studies failed to detect lymph node (LN) follicles or CD79α+ B cells, respectively in JH −/− pigs. T cell receptor (TCR)β transcription and T cells were detected in JH −/− pigs. When reared conventionally, JH −/− pigs succumbed to bacterial infections after weaning. These antibody (Ab)- and B cell-deficient pigs have significant value as models for both veterinary and human research to discriminate cellular and humoral protective immunity to infectious agents. Thus, these pigs may aid in vaccine development for infectious agents such as the pandemic porcine reproductive and respiratory syndrome virus (PRRSV) and H1N1 swine flu. These pigs are also a first significant step towards generating a pig that expresses fully human, antigen-specific polyclonal Ab to target numerous incurable infectious diseases with high unmet clinical need.
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Ramsoondar J, Mendicino M, Phelps C, Vaught T, Ball S, Monahan J, Chen S, Dandro A, Boone J, Jobst P, Vance A, Wertz N, Polejaeva I, Butler J, Dai Y, Ayares D, Wells K. Targeted disruption of the porcine immunoglobulin kappa light chain locus. Transgenic Res 2010; 20:643-53. [PMID: 20872247 DOI: 10.1007/s11248-010-9445-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Accepted: 09/13/2010] [Indexed: 10/19/2022]
Abstract
Inactivation of the endogenous pig immunoglobulin (Ig) loci, and replacement with their human counterparts, would produce animals that could alleviate both the supply and specificity issues of therapeutic human polyclonal antibodies (PAbs). Platform genetics are being developed in pigs that have all endogenous Ig loci inactivated and replaced by human counterparts, in order to address this unmet clinical need. This report describes the deletion of the porcine kappa (κ) light chain constant (Cκ) region in pig primary fetal fibroblasts (PPFFs) using gene targeting technology, and the generation of live animals from these cells via somatic cell nuclear transfer (SCNT) cloning. There are only two other targeted loci previously published in swine, and this is the first report of a targeted disruption of an Ig light chain locus in a livestock species. Pigs with one targeted Cκ allele (heterozygous knockout or ±) were bred together to generate Cκ homozygous knockout (-/-) animals. Peripheral blood mononuclear cells (PBMCs) and mesenteric lymph nodes (MLNs) from Cκ -/- pigs were devoid of κ-containing Igs. Furthermore, there was an increase in lambda (λ) light chain expression when compared to that of wild-type littermates (Cκ +/+). Targeted inactivation of the Ig heavy chain locus has also been achieved and work is underway to inactivate the pig lambda light chain locus.
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Luo Y, Liu M, Xia Y, Dai Y, Chou G, Wang Z. Therapeutic effect of norisoboldine, an alkaloid isolated from Radix Linderae, on collagen-induced arthritis in mice. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2010; 17:726-31. [PMID: 20363113 DOI: 10.1016/j.phymed.2010.01.013] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2009] [Revised: 11/24/2009] [Accepted: 01/25/2010] [Indexed: 05/23/2023]
Abstract
The alkaloid fraction of Radix Linderae, the main active component of this herb drug, has been proven to exhibit anti-inflammatory, analgesic and antimicrobial activities. The present study was undertaken to investigate the therapeutic potential of norisoboldine, the major isoquinoline alkaloid present in Radix Linderae, in collagen II -induced arthritis (CIA) of mice as well as the possible mechanisms. CIA was induced in mice by immunization with chicken type II collagen (II). After boosted on day 21, mice were treated with norisoboldine (10, 20, 40 mg/kg) for twenty consecutive days. The clinical scores, body weight changes and joint histopathology were evaluated. Norisoboldine treatment significantly alleviated the severity of the disease, based on the reduced clinical scores and elevated the lowered body weights of model mice. Meanwhile, this alkaloid dose-dependently reduced the infiltration of inflammatory cells, synovial hyperplasia and protected joint from destruction. Additionally, the serum level of anti-CII IgG and the CII-stimulated lymphocyte proliferation were remarkably decreased in the groups administered with norisoboldine. An assessment of Th1 function using the delayed-type hypersensitivity model confirmed that norisoboldine also significantly suppressed the enhanced T cell responses in vivo. These findings suggest that norisoboldine might be a potential therapeutic agent for rheumatoid arthritis, and it functions through protecting joint destruction as well as regulating the abnormal immune responses.
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Liang S, Dai Y, Li J, Liu B. Glass Forming Region of Cu−Ti−Hf Ternary Metal System Derived from the n-Body Potential through Molecular Dynamics Simulation. J Phys Chem B 2010; 114:9540-5. [DOI: 10.1021/jp100690r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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249
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Liu Q, Dai Y, Shufesky WJ, Morelli AE, wang Z, Toyoda Y. SUCCESSFUL REDUCTION OF IMMUNOSUPPRESSION WITH A NOVEL TOLERANCE PROTOCOL IN AGED, BUT NOT IN YOUNG MICE TRANSPLANTED WITH CARDIAC ALLOGRAFTS. Transplantation 2010. [DOI: 10.1097/00007890-201007272-00493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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250
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Kanavaros P, Kouvidou C, Dai Y, Tzardi M, Datseris G, Darivianaki K, Rontogianni D, Delides G. MDM-2 protein expression in nasopharyngeal carcinomas. Comparative study with p53 protein expression. Mol Pathol 2010; 48:M322-5. [PMID: 16696032 PMCID: PMC407999 DOI: 10.1136/mp.48.6.m322] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Aims-To investigate the immunohistochemical expression of MDM-2 protein in comparison with that of p53 protein in nasopharyngeal carcinomas.Methods-Formalin fixed, paraffin wax embedded tissue from 59 cases of nasopharyngeal carcinoma was stained by immunohistochemistry for MDM-2 and p53 proteins.Results-The tumours were divided histologically into seven cases of keratinising nasopharyngeal carcinoma (KNPC), 14 cases of non-keratinising nasopharyngeal carcinoma (NKNPC), and 38 cases of undifferentiated nasopharyngeal carcinoma (UNPC). MDM-2 nuclear expression was observed in 0/7 KNPC, 1/14 NKNPC, and 11/38 UNPC. p53 nuclear expression was observed in 1/7 KNPC, 2/14 NKNPC, and 15/38 UNPC. Parallel MDM-2 and p53 expression was found in 12 cases (11 UNPC and one NKNPC). Discordant MDM-2-/p53 + expression was found in six cases (four UNPC, one NKNPC, and one KNPC), and absence of expression of both proteins in the remaining 41 cases.Conclusions-Expression of MDM-2 and p53 proteins may be associated with the level of tumour cell differentiation in nasopharyngeal carcinoma. Simultaneous expression of MDM-2/p53 in a proportion of UNPC suggests that MDM-2 protein may be responsible for stabilisation of p53 protein in these cases, in view of the previous demonstration of the p53 gene in germ line configuration. This could be important in the pathogenesis of these cases, since MDM-2 may deregulate the p53 dependent growth suppressive pathway. Discordant MDM-2-/p53 + expression in a few cases of nasopharyngeal carcinoma may reflect stabilisation of p53 protein by other proteins, or p53 mutations unable to activate MDM-2.
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