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Xing J, Wang H, Xu S, Han P, Xin M, Zhou JL. Sensitization of suberoylanilide hydroxamic acid (SAHA) on chemoradiation for human cervical cancer cells and its mechanism. EUR J GYNAECOL ONCOL 2015; 36:117-122. [PMID: 26050346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
PURPOSE To explore the sensitization of suberoylanilide hydroxamic acid (SAHA) on chemoradiation for cervical cancer cells and its mechanism. MATERIALS AND METHODS After human cervical cancer SiHa cells were treated with SAHA and cisplatin (DDP) of different concentrations, inhibition and apoptosis rates, and cell cycle were detected. SiHa cells underwent radiation of various doses after treated with 20% IC50 of SAHA for 24 hours. The survival fraction of SiHa cells was calculated by colony-forming assay, and related parameters were calculated. mRNA and protein expressions of P21, Bax and Ku70 were detected. RESULTS The inhibition rate was higher in SD (SAHA combined with DDP) group than in D (DDP alone) group (p < 0.05). The number of cells in G0/G1 phase was higher, and the number of cells in G2/M+S phase and PI (proliferation index) were lower in S (SAHA), D, and SD groups than in control group, and in SD group than in S and D groups (p < 0.05). The apoptosis rate and the expressions of mRNA and protein of Bax and P21 were higher in SD group than in S or D group (p < 0.05). The cell survival fraction was lower in SAHA combined with radiotherapy group than in radiotherapy alone group (p < 0.05). Do, N, and Dq values were 2.329, 2.761, and 1.721, respectively, in radiotherapy alone group and 1.213, 4.770, and 0.823, respectively, in SAHA combined with radiotherapy group. SER was 1.92. Bax mRNA and protein expressions were higher but Ku70 mRNA and protein expressions were lower in SAHA combined with radiotherapy group than in radiotherapy alone group (p < 0.05). CONCLUSION SAHA promotes SiHa apoptosis in chemotherapy through up-regulation of mRNA and protein of p21 and Bax which leads to cell cycle arrest in G0/G1 phase. Low dose of SAHA promotes SiHa apoptosis and inhibits cell repair in radiotherapy through Bax up-regulation and Ku70 down-regulation.
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Zhang J, Tian XJ, Zhang H, Teng Y, Li R, Bai F, Elankumaran S, Xing J. TGF- -induced epithelial-to-mesenchymal transition proceeds through stepwise activation of multiple feedback loops. Sci Signal 2014; 7:ra91. [DOI: 10.1126/scisignal.2005304] [Citation(s) in RCA: 326] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Li F, Li J, Zhifang M, Zhang Y, Xing J. Quantifying Internal Target Volume Uncertainties Derived From 3-Dimensional CT and 4-Dimensional CT for Radiation Therapy of Non-Small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.2481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Feng G, Kong B, Xing J, Chen J. Enhancing multimodality functional and molecular imaging using glucose-coated gold nanoparticles. Clin Radiol 2014; 69:1105-11. [PMID: 25023059 DOI: 10.1016/j.crad.2014.05.112] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2014] [Revised: 05/14/2014] [Accepted: 05/20/2014] [Indexed: 01/03/2023]
Abstract
AIM To describe how pegylated glucose-coated gold nanoparticles (PEG-Glu-GNPs) can help improve computed tomography (CT) imaging. MATERIALS AND METHODS PEG-Glu-GNPs were designed for use as an imaging nanoprobe to act an effective contrast agent for both CT and PET scans. Twelve BALB/c mice were divided into two groups: mice with injected with PEG-Glu-GNPs and control mice. The mice were examined using high-resolution micro-CT at different time intervals (24 h, 7 days, and 15 days) after the injection of the particles. Greyscale density and CT attenuation values were determined to trace the excretion of the particles over time. RESULTS Tumour contours were easily distinguished from surrounding tissue in mice injected with PEG-Glu-GNPs but not controls. This distinction was still visible at 7 days, but not at 15 days post-injection. CONCLUSION Molecular imaging technology has enabled the development of a new generation of imaging probes. These sophisticated probes can visualize biological processes or enable early diagnosis of diseases in vivo. Compared to conventional CT images and PET scans, PEG-Glu-GNPs significantly improved image quality at the cellular and molecular level, which can significantly aid the early detection of cancer or cancer metastases.
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Weinblatt M, Mease P, Mysler E, Takeuchi T, Drescher E, Berman A, Zilberstein M, Xing J, Emery P. SAT0244 A Phase Iib Study of the Efficacy and Safety of Subcutaneous Clazakizumab (ANTI-IL-6 Monoclonal Antibody) with or without Methotrexate in Adults with Moderate-To-Severe Active Rheumatoid Arthritis and an Inadequate Response to Methotrexate. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.3754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Chen Y, Qu F, He X, Bao G, Liu X, Wan S, Xing J. Short leukocyte telomere length predicts poor prognosis and indicates altered immune functions in colorectal cancer patients. Ann Oncol 2014; 25:869-876. [PMID: 24608194 DOI: 10.1093/annonc/mdu016] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Numerous studies indicate that the leukocyte telomere length is associated with the risk of cancers, including colorectal cancer (CRC). However, the prognostic value of leukocyte telomere length in CRC patients has not been investigated. PATIENTS AND METHODS Relative telomere length (RTL) of peripheral blood leukocytes (PBLs) from 571 CRC patients receiving surgical resection was measured using a polymerase chain reaction-based method. The Cox proportional hazards ratio model and the Kaplan-Meier curve were used to estimate the association between RTL and the clinical outcome of CRC patients in the training set (90 patients) and the testing set (86 patients). Finally, an independent cohort of 395 patients was used as an external validation set. The immunophenotype of PBLs and the plasma concentration of several immune-related cytokines were determined by flow cytometry and enzyme-linked immunosorbent assay, respectively. RESULTS Patients with shorter RTL had significantly poorer overall survival and relapse-free survival than those with longer RTL in the training, testing and validation sets. Furthermore, leukocyte RTL and Tumor-Node-Metastasis (TNM) stage exhibited a significant joint effect in the prognosis prediction of combined CRC patients, indicating that patients with both short RTL and advanced stages had the worst prognosis, when compared with other subgroups. In addition, patients with short RTL showed the higher percentage of CD4(+) T cell and the lower percentage of B cell in peripheral blood mononuclear cells, as well as the lower concentration of plasma transforming growth factor-β1, suggesting a possibility that the immune functions changed with RTL alteration. CONCLUSIONS Our study for the first time demonstrates that leukocyte RTL is an independent prognostic marker complementing TNM stage and associated with the immune functions in CRC patients.
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Wang T, Chen S, Sun J, Cai J, Cheng X, Dong H, Wang X, Xing J, Dong W, Yao H, Dong Y. Identification of factors influencing the pharmacokinetics of voriconazole and the optimization of dosage regimens based on Monte Carlo simulation in patients with invasive fungal infections. J Antimicrob Chemother 2014; 69:463-470. [DOI: 10.1093/jac/dkt369] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2023] Open
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Cai J, Chen S, Zhang W, Wei Y, Lu J, Xing J, Dong Y. Proteomic analysis of differentially expressed proteins in 5-fluorouracil-treated human breast cancer MCF-7 cells. Clin Transl Oncol 2013; 16:650-9. [PMID: 24217974 DOI: 10.1007/s12094-013-1127-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 10/22/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND 5-Fluorouracil (5-Fu) is a commonly used chemotherapeutic agent in clinical care of breast cancer patients. However, the mechanism of how the 5-Fu works is complex and still largely unknown. OBJECTIVE The objective of this study was to understand the mechanism further and explore the new targets of 5-Fu. METHODS The differentially expressed proteins induced by 5-Fu in human breast cancer MCF-7 cells were identified by proteomic analysis. Four differentially expressed proteins were validated using Western blot and quantitative real-time reverse-transcription polymerase chain reaction analysis for protein and mRNA levels. The effect of 5-Fu on MCF-7 cells was determined by cell viability assay, transmission electron microscopy and flow cytometry analysis. RESULTS 5-Fu dose-dependently inhibited cell proliferation with the IC50 value of 98.2 μM. 5-Fu also induced obviously morphological change and apoptosis in MCF-7 cells. Twelve differentially expressed proteins involved in energy metabolism, cytoskeleton, cellular signal transduction and tumor invasion and metastasis were identified. CONCLUSION These results may provide a new insight into the molecular mechanism of 5-Fu in therapy of breast cancer.
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Fang Y, Ding Y, Guo Q, Xing J, Long Y, Zong Z. Radioiodine therapy for patients with differentiated thyroid cancer after thyroidectomy: direct comparison and network meta-analyses. J Endocrinol Invest 2013; 36:896-902. [PMID: 23723055 DOI: 10.3275/8998] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND AND OBJECTIVES The effective dose of radioiodine 131 (I-131) ablation for patients with differentiated thyroid cancer (DTC) after thyroidectomy was unclear, so we tried to find out which activity is the best using the methods of direct comparison and network meta-analyses. METHODS Direct comparison and network meta-analyses were conducted with ADDIS software. Randomized controlled trials (RCT) which compared different activities of I-131 after thyroidectomy for adult patients with DTC were included. The outcomes we evaluated were successful remnant ablation rate, duration of stay in an isolation unit, the number of subsequent I-131 treatments required, recurrence rate, and adverse effects. RESULTS Thirteen RCT (3352 patients) were included. Our network meta-analysis demonstrated that there were not any statistical differences in successful ablation rates among all comparisons except 100 mCi vs 15 mCi. However, rank probability plot suggested 60 mCi might be the best in successful ablation rate. For recurrence rate, both direct comparison and network meta-analyses showed no statistical differences among 100 mCi, 60 mCi, and 30 mCi; 100 mCi was associated with a smaller number of patients who required subsequent I-131 treatments and longer stay in an isolation unit than 30 mCi without any more adverse events. CONCLUSION Because of conflicting results between direct comparison and network meta-analyses, we failed to conclude which activity of I-131 is the best in successful ablation rates.
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Spradling PR, Simons B, Narayanan M, Xing J, Homan C, Bulkow L, Cagle H, Schraer CD, McMahon BJ. Incidence of diabetes mellitus in a population-based cohort of persons with chronic hepatitis B virus infection. J Viral Hepat 2013; 20:510-3. [PMID: 23730845 PMCID: PMC6432791 DOI: 10.1111/jvh.12071] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2012] [Accepted: 12/18/2012] [Indexed: 12/09/2022]
Abstract
To investigate the effect of hepatitis B virus (HBV) infection on the development of diabetes mellitus (DM), we compared DM incidence and characteristics of Alaska Native persons with and without HBV infection. From 1990 to 2010, there were 52 incident DM cases among 1309 persons with infection vs 4557 DM cases among 85 698 persons without infection (log-rank test, P = 0.20). Compared to infected persons without DM, those with DM were significantly older (57.0 vs 47.4 years, P < 0.001) and had higher body mass index (34.5 vs 28.4 kg/m(2) , P < 0.001). Genotype, immune active disease and the presence of cirrhosis were not associated with DM. In this population-based cohort with over 20 years of follow-up, there was no effect of HBV infection on DM development.
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Hua WR, Yi MQ, Min TL, Feng SN, Xuan LZ, Xing J. Popliteal versus tibial retrograde access for subintimal arterial flossing with antegrade-retrograde intervention (SAFARI) technique. Eur J Vasc Endovasc Surg 2013; 46:249-54. [PMID: 23764133 DOI: 10.1016/j.ejvs.2013.05.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 05/09/2013] [Indexed: 11/20/2022]
Abstract
OBJECTIVE This study aimed to ascertain differences in benefit and effectiveness of popliteal versus tibial retrograde access in subintimal arterial flossing with the antegrade-retrograde intervention (SAFARI) technique. METHODS This was a retrospective study of SAFARI-assisted stenting for long chronic total occlusion (CTO) of TASC C and D superficial femoral lesions. 38 cases had superficial femoral artery lesions (23 TASC C and 15 TASC D). All 38 cases underwent SAFARI-assisted stenting. The ipsilateral popliteal artery was retrogradely punctured in 17 patients. A distal posterior tibial (PT) or dorsalis pedis (DP) artery was retrogradely punctured in 21 patients, and 16 of them were punctured after open surgical exposure. RESULTS SAFARI technical success was achieved in all cases. There was no significant difference in 1-year primary patency (75% vs. 78.9%, p = .86), secondary patency (81.2% vs. 84.2%, p = .91) and access complications (p = 1.00) between popliteal and tibial retrograde access. There was statistical difference in operation time between popliteal (140.1 ± 28.4 min) and tibial retrograde access with PT/DP punctures after surgical vessel exposure (120.4 ± 23.0 min, p = .04). CONCLUSION The SAFARI technique is a safe and feasible option for patients with infrainguinal CTO (TASC II C and D). The PT or DP as the retrograde access after surgical vessel exposure is a good choice when using the SAFARI technique.
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Ling X, Xing J, Zhang JZ, Chen WF, Zan X, Du FY, Li XX, Yao H, Lou HX. The Absorption, Distribution, Metabolism and Excretion of Riccardin D in Rats. Drug Res (Stuttg) 2013; 63:159-64. [DOI: 10.1055/s-0033-1334895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wang W, Li J, Hu H, Xu M, Sun T, Xing J. Dose Distribution Analysis in Whole Breast Intensity Modulated Radiation Therapy Based on 4DCT and 3DCT. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wang W, Li J, Zhang Y, Fan T, Qi H, Xing J. Comparison of the Planning Target Volume Based on 3-dimensional CT and 4-dimensional CT Images of Thoracic Esophageal Cancer. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Schillie SF, Xing J, Murphy TV, Hu DJ. Prevalence of hepatitis B virus infection among persons with diagnosed diabetes mellitus in the United States, 1999-2010. J Viral Hepat 2012; 19:674-6. [PMID: 22863272 DOI: 10.1111/j.1365-2893.2012.01616.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
The prevalence of hepatitis B virus (HBV) infection among persons with diabetes has not been assessed among the US population, despite increasing reports of HBV transmission in institutional care settings. Using national survey data, we found a 60% higher prevalence of HBV infection among persons with (vs without) diagnosed diabetes.
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Xing J, Du FY, Liu T, Zhu FP. Autoinduction of phase I and phase II metabolism of artemisinin in rats. Xenobiotica 2012; 42:929-38. [DOI: 10.3109/00498254.2012.669871] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Vincenti F, Larsen CP, Alberu J, Bresnahan B, Garcia VD, Kothari J, Lang P, Urrea EM, Massari P, Mondragon-Ramirez G, Reyes-Acevedo R, Rice K, Rostaing L, Steinberg S, Xing J, Agarwal M, Harler MB, Charpentier B. Three-year outcomes from BENEFIT, a randomized, active-controlled, parallel-group study in adult kidney transplant recipients. Am J Transplant 2012; 12:210-7. [PMID: 21992533 DOI: 10.1111/j.1600-6143.2011.03785.x] [Citation(s) in RCA: 221] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The clinical profile of belatacept in kidney transplant recipients was evaluated to determine if earlier results in the BENEFIT study were sustained at 3 years. BENEFIT is a randomized 3 year, phase III study in adults receiving a kidney transplant from a living or standard criteria deceased donor. Patients were randomized to a more (MI) or less intensive (LI) regimen of belatacept, or cyclosporine. 471/666 patients completed ≥3 years of therapy. A total of 92% (MI), 92% (LI), and 89% (cyclosporine) of patients survived with a functioning graft. The mean calculated GFR (cGFR) was ∼21 mL/min/1.73 m(2) higher in the belatacept groups versus cyclosporine at year 3. From month 3 to month 36, the mean cGFR increased in the belatacept groups by +1.0 mL/min/1.73 m(2) /year (MI) and +1.2 mL/min/1.73 m(2) /year (LI) versus a decline of -2.0 mL/min/1.73 m(2) /year (cyclosporine). One cyclosporine-treated patient experienced acute rejection between year 2 and year 3. There were no new safety signals and no new posttransplant lymphoproliferative disorder (PTLD) cases after month 18. Belatacept-treated patients maintained a high rate of patient and graft survival that was comparable to cyclosporine-treated patients, despite an early increased occurrence of acute rejection and PTLD.
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Xing J, Li J, Zhang Y, Li F, Fan T, Xu M, Shang D, Han J. Comparative Study Between The Three Methods To Delineate Internal Target Volume Of The Primary Hepatocarcinoma Based On Four-dimensional CT Simulation Images. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.1847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Xing J, Li J, Zhang Y, Li F, Fan T, Xu M, Shang D, Han J. Comparison Of The Gross Tumor Volume Based On Three-dimensional CT And Four-dimensional CT Simulation Images Of Primary Liver Cancer. Int J Radiat Oncol Biol Phys 2011. [DOI: 10.1016/j.ijrobp.2011.06.554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Li F, Li J, Xing J, Fan T, Xu M, Shao Q. 6538 POSTER Comparison of the Different Planning Targets Defined Basing on Three-dimensional CT and Four-dimensional CT Images for Liver Cancer. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)71849-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pei Y, Han T, Ma X, Li Y, Xing J, Song Z. PP-124 The variation of HBsAg titre in patients with chronic hepatitis B, HBV-related liver cirrhosis and hepatocellular carcinoma. Int J Infect Dis 2011. [DOI: 10.1016/s1201-9712(11)60276-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Bendorf A, Kerridge I, Pussell B, Donadio C, Hesham A, Grassi G, Kanaki A, Barsotti M, Hertig A, Dubois-Xu YC, Buob D, Noel C, Rondeau E, Hazzan M, Dahle DO, Mjoen G, Marz W, Holme I, Fellstrom B, Jardine A, Holdaas H, Vincenti F, Larsen C, Alberu J, Duro Garcia V, Rostaing L, Rice K, Schnitzler M, Xing J, Agarwal M, Charpentier B. Transplantation / Clinical studies. Clin Kidney J 2011. [DOI: 10.1093/ndtplus/4.s2.18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Walker R, Ruderman I, Masterson R, Cohney S, Salvadori M, Conti P, Bertoni E, Durrbach A, Citterio F, Mulloy L, David-Neto E, Russ G, Vitko S, Zhang R, Xing J, Harler MB, Grinyo J, Rugiu C, Trubian A, Bernich P, Lupo A, Asbe-Vollkopf A, Pannu A, Hoefeld H, Gauer S, Gossmann J, Kachel HG, Froese S, Korom S, Geiger H, Hauser IA, Liefeldt L, Kluener C, Glander P, Giessing M, Gralla O, Neumayer HH, Budde K, Kroencke T, Liborio AB, Barros RM, Esmeraldo RM, Oliveira MLMB, Nogueira Paes FJV, Mendoza TR, Silva Junior GB, Daher EF, Siekierka-Harreis M, Bantis C, Kouri NM, Schwandt C, Rump LC, Ivens K, Slatinska J, Honsova E, Burgelova M, Slimackova E, Viklicky O, Tabernero G, Rivero K, Fernandez G, Canueto J, Garcia P, Fraile P, Lucas C, Tabernero JM, Bargnoux AS, Simon N, Garrigue V, Dupuy AM, Mourad G, Cristol JP, Yapici U, Kers J, Bemelman F, Roelofs J, Groothoff J, van der Loos C, van Donselaar-van der Pant K, Idu M, Claessen N, ten Berge I, Florquin S, Knap B, Dragonja Z, Dobnik S, Buturovic Ponikvar J, Ponikvar R, Kandus A, Bren A, Hauser IA, Kleemann J, Gauer S, Engel J, Winter S, Hoefeld H, Asbe-Vollkopf A, Brzoska M, Obermueller N, Geiger H, Schaeffeler E, Oldak M, Pazik J, Lewandowski Z, Sitarek E, Dabrowski M, Ploski R, Malejczyk J, Durlik M, Slubowska K, Urbanowicz A, Sadowska A, Lichodziejewska B, Kurnicka K, Galazka Z, Chmura A, Durlik M, Masin-Spasovska J, Spasovski G, Petrusevska G, Popov Z, Ivanovski N, Di Napoli A, Salvatori MF, Franco F, Di Lallo D, Guasticchi G, Sancho A, Gavela E, Beltran S, Kanter J, Alemany B, Crespo JF, Pallardo LM, Lionet A, Beuscart JB, Buob D, BenHenda A, Provot F, Hazzan M, Noel C, Galan-Sanchez F, Marin-Casanova P, Mazuecos A, Garcia-Alvarez T, Aznar E, Rodriguez-Iglesias M, Ossareh S, Salami M, Mohammad E, Hosseini M, Pawlik A, Chudek J, Kolonko A, Wilk J, Jalowiecki P, Wiecek A, Zyablitskaya E, Galkina E, Yushina E, Botelho C, Aires P, Santos L, Romaozinho C, Macario F, Alves R, Veiga P, Mota A, Yashi M, Yagisawa T, Kimura T, Nukui A, Fujiwara T, Sakuma Y, Ishikawa N, Iwabuchi T, Muraishi O, Glander P, Hambach P, Liefeldt L, Neumayer HH, Budde K, Esmen S, Keven K, Sengul S, Ozcan M, Ensari A, Tuzuner A, Calayoglu R, Nergizoglu G, Gullu Koca T, Koca N, Ersoy A, Faria B, Bustorff M, Barros F, Tavares I, Santos J, Ferreira I, Sampaio S, Pestana M, Keven K, Suvak B, Sengul S, Kurultak I, Calayoglu R, Tutkak H, Choi HM, Yang HN, Jo SK, Cho WY, Kim HK, Aybal Kutlugun A, Altun B, Akman U, Aki T, Turkmen E, Yildirim T, Altindal M, Yilmaz R, Yasavul U, Gullu Koca T, Koca N, Ersoy A, Thiem U, Heinze G, Gossler U, Perkmann T, Kainberger F, Muhlbacher F, Horl W, Borchhardt K, Sanchez-Escuredo A, Holgado S, Biosca C, Granada ML, Barluenga E, Lauzurica R, Romero R, Espinal A, Torregrossa V, Bayes B, Tomida K, Hamano T, Fujii N, Ichimaru N, Matsui I, Isaka Y, Rakugi H, Takahara S, Gavela E, Sancho A, Kanter J, Beltran S, Avila A, Crespo JF, Pallardo LM, Dor F, Massey E, Frunza M, Johnson R, Lennerling A, Loven C, Mamode N, Pascalev A, Sterckx S, Van Assche K, Zuidema W, Weimar W, Botelho C, Aires P, Santos L, Romaozinho C, Macario F, Alves R, Veiga P, Mota A, Allwin R, Gauer S, Roessel, Hoefeld H, Brzoska M, Buettner S, Gossmann J, Belwe V, Geiger H, Hauser IA, Apaza J, Gonzalez E, Polanco N, Bengoa I, Cadenillas C, Andres A, Morales JM, Rocha S, Fonseca I, Martins LS, Vidinha J, Dias L, Almeida M, Pedroso S, Henriques A, Cabrita A, Neretljak I, Mihovilovic K, Vidas Z, Jurenec F, Knotek M, Justa S, Minz R, Minz M, Anand S, Sharma A, Lacquaniti A, Donato V, Chirico V, Pettinato G, Buemi M, Galle J, Addison J, Perry P, Claes K, Farouk M, Guerin A, Kiss I, Winearls C, Di Giulio S, Basic-Jukic N, Slavicek J, Bubic-Filipi L, Kes P, Scholbach T, Wang HK, Yang AH, Loong CC, Wu TH, Abboud I, Antoine C, Serrato T, Lefaucheur C, Pillebout E, Gaudez F, Fieux F, Flamant M, Verine J, Viglietti D, Peraldi MN, Glotz D. Transplantation: clinical studies (2). Clin Kidney J 2011. [DOI: 10.1093/ndtplus/4.s2.60] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Wang F, Chen J, Shao W, Kang X, Xu S, Xia J, Dai H, Peng Y, Thorlacius H, Xing J, Qi Z. The Major Histocompatibility Complex (MHC) of the Secondary Transplant Tissue Donor Influences the Cross-Reactivity of Alloreactive Memory Cells. Scand J Immunol 2011; 73:190-7. [DOI: 10.1111/j.1365-3083.2010.02493.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Xing J, Bai K, Liu T, Wang R, Zhang L, Zhang S. The multiple-dosing pharmacokinetics of artemether, artesunate, and their metabolite dihydroartemisinin in rats. Xenobiotica 2010; 41:252-8. [DOI: 10.3109/00498254.2010.542257] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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76
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Kim ES, Vaporciyan AA, Xing J, Huang M, Spitz MR, Lippman SM, Gu J, Roth JA, Wu X. Use of telomere length in peripheral leukocytes to predict risk of recurrence in patients with early-stage non-small cell lung cancer after curative resection. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.7031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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77
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Xing J, Ling C. Perceptual complexity in visual displays. J Vis 2010. [DOI: 10.1167/7.9.717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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78
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Xing J. The intrinsic differences of lateral interactions in fovea and periphery and their functional impacts on visual perception. J Vis 2010. [DOI: 10.1167/3.9.659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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79
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80
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Xing J, Ahumada AJ. Estimation of human-observer templates in temporal-varying noise. J Vis 2010. [DOI: 10.1167/2.7.343] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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81
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Durrbach A, Pestana JM, Pearson T, Vincenti F, Garcia VD, Campistol J, Rial MDC, Florman S, Block A, Di Russo G, Xing J, Garg P, Grinyó J. A phase III study of belatacept versus cyclosporine in kidney transplants from extended criteria donors (BENEFIT-EXT study). Am J Transplant 2010; 10:547-57. [PMID: 20415898 DOI: 10.1111/j.1600-6143.2010.03016.x] [Citation(s) in RCA: 387] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Recipients of extended criteria donor (ECD) kidneys are at increased risk for graft dysfunction/loss, and may benefit from immunosuppression that avoids calcineurin inhibitor (CNI) nephrotoxicity. Belatacept, a selective costimulation blocker, may preserve renal function and improve long-term outcomes versus CNIs. BENEFIT-EXT (Belatacept Evaluation of Nephroprotection and Efficacy as First-line Immunosuppression Trial-EXTended criteria donors) is a 3-year, Phase III study that assessed a more (MI) or less intensive (LI) regimen of belatacept versus cyclosporine in adult ECD kidney transplant recipients. The co-primary endpoints at 12 months were composite patient/graft survival and a composite renal impairment endpoint. Patient/graft survival with belatacept was similar to cyclosporine (86% MI, 89% LI, 85% cyclosporine) at 12 months. Fewer belatacept patients reached the composite renal impairment endpoint versus cyclosporine (71% MI, 77% LI, 85% cyclosporine; p = 0.002 MI vs. cyclosporine; p = 0.06 LI vs. cyclosporine). The mean measured glomerular filtration rate was 4-7 mL/min higher on belatacept versus cyclosporine (p = 0.008 MI vs. cyclosporine; p = 0.1039 LI vs. cyclosporine), and the overall cardiovascular/metabolic profile was better on belatacept versus cyclosporine. The incidence of acute rejection was similar across groups (18% MI; 18% LI; 14% cyclosporine). Overall rates of infection and malignancy were similar between groups; however, more cases of posttransplant lymphoproliferative disorder (PTLD) occurred in the CNS on belatacept. ECD kidney transplant recipients treated with belatacept-based immunosuppression achieved similar patient/graft survival, better renal function, had an increased incidence of PTLD, and exhibited improvement in the cardiovascular/metabolic risk profile versus cyclosporine-treated patients.
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Chen X, He D, Hou H, Wang M, He H, Yang Z, Xing J, Nan X. UP-1.109: Clinical Analysis of Transrectal Ultrasound Guided Needle Biopsies of the Prostate in 540 Patients. Urology 2009. [DOI: 10.1016/j.urology.2009.07.556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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83
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Roa W, Zhang X, Patel S, Amanie J, Sun X, Chen J, Moore R, Xing J. 49 GOLD-NANOPARTICLES SENSITIZE RADIOTHERAPY OF PROSTATE CANCER CELLS BY REGULATION OF CELL CYCLE. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)72436-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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84
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Fu P, Birukova AA, Xing J, Sammani S, Murley JS, Garcia JGN, Grdina DJ, Birukov KG. Amifostine reduces lung vascular permeability via suppression of inflammatory signalling. Eur Respir J 2008; 33:612-24. [PMID: 19010997 DOI: 10.1183/09031936.00014808] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Despite an encouraging outcome of antioxidant therapy in animal models of acute lung injury, effective antioxidant agents for clinical application remain to be developed. The present study investigated the effect of pre-treatment with amifostine, a thiol antioxidant compound, on lung endothelial barrier dysfunction induced by Gram-negative bacteria wall-lipopolysaccharide (LPS). Endothelial permeability was monitored by changes in transendothelial electrical resistance. Cytoskeletal remodelling and reactive oxygen species (ROS) production was examined by immunofluorescence. Cell signalling was assessed by Western blot. Measurements of Evans blue extravasation, cell count and protein content in bronchoalveolar lavage fluid were used as in vivo parameters of lung vascular permeability. Hydrogen peroxide, LPS and interleukin-6 caused cytoskeletal reorganisation and increased permeability in the pulmonary endothelial cells, reflecting endothelial barrier dysfunction. These disruptive effects were inhibited by pre-treatment with amifostine and linked to the amifostine-mediated abrogation of ROS production and redox-sensitive signalling cascades, including p38, extracellular signal regulated kinase 1/2, mitogen-activated protein kinases and the nuclear factor-kappaB pathway. In vivo, concurrent amifostine administration inhibited LPS-induced oxidative stress and p38 mitogen-activated protein kinase activation, which was associated with reduced vascular leak and neutrophil recruitment to the lungs. The present study demonstrates, for the first time, protective effects of amifostine against lipopolysaccharide-induced lung vascular leak in vitro and in animal models of lipopolysaccharide-induced acute lung injury.
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85
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Liu C, Li J, Xing J, Liang C, Tian S, Fan T, Xu M. Comparison of Displacement of the Silver Clips in the Cavity Determined by KV-plain Film and Cone-beam Computed Tomography for the Breast Cancer Patients Treated by Three-dimensional Conformal External-beam Partial Breast Irradiation Assisted by Active Breathing Control. Int J Radiat Oncol Biol Phys 2008. [DOI: 10.1016/j.ijrobp.2008.06.049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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86
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Xing J, Li JB, Yu JM, Shi F, Xu M, Lu J, Fan TY, Guo SF, Tian SY, Liang CQ, Shao Q. A retrospective study on the relationship between normal tissue complication probability and computed tomography grading of radiation-induced lung injury for the patients with non-small cell lung cancer treated by three-dimensional conformal radiotherapy. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.7555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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87
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Ying-jie Z, Li JB, Yu JM, Xing J, Xu M. Primary study on target reproducibility of peripheral non-small cell lung cancer in cone-beam CT based image-guided radiotherapy. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.7596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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88
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Xu M, Li JB, Yu JM, Xing J, Zhang YJ, Tian SY, Liang CQ, Shao Q, Fan TY, Jie L. Measurement of the width and the depth of internal mammary lymph nodes according to internal mammary artery and vein on CT simulition in breast cancer post-surgery. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.11586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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89
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Xing J, Li JB, Yu JM, Shi F, Xu M, Tian SY, Shao Q, Fan TY, Liang CQ, Zhang YJ. Study on the relationship between radiation-induced lung injury and chemotherapy in the patients with non-small cell lung cancer (NSCLC) treated by three-dimensional conformal radiotherapy (3D-CRT). J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.7602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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90
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Xing J, Stewart DJ, Gu J, Lu C, Spitz MR, Wu X. Expression of methylation-related genes is associated with overall survival in patients with non-small cell lung cancer. Br J Cancer 2008; 98:1716-22. [PMID: 18414412 PMCID: PMC2391117 DOI: 10.1038/sj.bjc.6604343] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2007] [Revised: 01/18/2008] [Accepted: 03/10/2008] [Indexed: 12/21/2022] Open
Abstract
The abnormality of DNA methylation is involved in tumour progression, and thus has a modulating effect on clinical outcome of cancer patients. In this study, we measured the mRNA expression levels of three methylation-regulating genes (DNMT1, DNMT3b, and MBD2) in 148 tumour samples from patients with non-small cell lung cancer (NSCLC) using quantitative real-time polymerase chain reaction and then determined their prognostic values. Our data showed that the high level of DNMT1 expression was significantly associated with an increased risk of death in all NSCLC patients (hazard ratio (HR), 1.74; 95% confidence interval (95% CI), 1.04-2.90). However, the high level of DNMT3b expression was significantly associated with poor prognosis only in young patients (<65 years). The high level of MBD2 expression had a significantly reduced risk for death only in male patients and in squamous cell lung carcinoma (SQLC) patients. All three combination groups with DNMT1 and DNMT3b, DNMT1 and MBD2 or DNMT3b and MBD2 revealed significant combined effects in male patients and SQLC patients. Our results suggest that DNMT1, DNMT3b, and MBD2 may play important roles in modulating NSCLC patient survival and thus be useful for identifying NSCLC patients who would benefit most from aggressive therapy.
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91
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Yan P, Qin D, An YK, Li GZ, Xing J, Liu JJ. In situ synthesis and characterization of GaN nanorods through thermal decomposition of pre-grown GaN films. NANOTECHNOLOGY 2008; 19:025605. [PMID: 21817547 DOI: 10.1088/0957-4484/19/02/025605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Herein we describe a thermal treatment route to synthesize gallium nitride (GaN) nanorods. In this method, GaN nanorods were synthesized by thermal treatment of GaN films at a temperature of 800 °C. The morphology and structure of GaN nanorods were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that GaN nanorods have a hexagonal wurtzite structure with diameters ranging from 30 to 50 nm. Additionally, GaN nanoplates are also founded in the products. The growth process of GaN nanostructures was investigated and a thermal decomposition mechanism was proposed. Our method provides a cost-effective route to fabricate GaN nanorods, which will benefit the fabrication of one-dimensional nanomaterials and device applications.
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92
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Xing J, Li J, Fan T, Shao Q, Yu J, Lu J, Guo S, Shi F, Xu M, Tian S. A Retrospective Study on the Relationship of Dose-Volume Histogram Parameters and Computed Tomography Grading of Radiation-Induced Lung Injury for the Patients With Non-Small Cell Lung Cancer Treated by Three-Dimensional Conformal Radiotherapy. Int J Radiat Oncol Biol Phys 2007. [DOI: 10.1016/j.ijrobp.2007.07.1676] [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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93
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Xing J, Zhao K, Lu HB, Wang X, Liu GZ, Jin KJ, He M, Wang CC, Yang GZ. Visible-blind, ultraviolet-sensitive photodetector based on SrTiO3 single crystal. OPTICS LETTERS 2007; 32:2526-8. [PMID: 17767293 DOI: 10.1364/ol.32.002526] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
High-sensitivity and visible-blind ultraviolet (UV) photoconductive detectors based on SrTiO(3) single crystal with interdigitated electrodes are reported. The responsivities of photovoltage and photocurrent can reach 2.13x10(5) V/W and 213 mA/W, respectively, at 330 nm at ambient temperature, and the corresponding quantum efficiency eta reaches 80.2%. The dark current is lower than 50 pA at 10 V bias, and the UV/visible contrast ratio is about four orders of magnitude with a sharp cutoff at 390 nm. The experimental results demonstrate that SrTiO(3) single crystal has potentially wide applications in UV detection.
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Yazdy MM, Honein MA, Xing J. Impact of Folic Acid Fortification on Orofacial Clefts. Am J Epidemiol 2006. [DOI: 10.1093/aje/163.suppl_11.s52-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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95
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Ouyang H, Xing J, Chen JDZ. Tachygastria induced by gastric electrical stimulation is mediated via alpha- and beta-adrenergic pathway and inhibits antral motility in dogs. Neurogastroenterol Motil 2005; 17:846-53. [PMID: 16336500 DOI: 10.1111/j.1365-2982.2005.00696.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
BACKGROUND It is known that tachygastria is associated with gastric hypomotility and retrograde gastric electrical stimulation (RGES) delays gastric emptying and is proposed for treating obesity. The aim was to investigate the effects and mechanisms of RGES on postprandial antral contraction in dogs. METHODS Seven dogs were implanted with a gastric cannula and three pairs of gastric serosal electrodes. Antral contractions and gastric myoelectrical activity were recorded immediately after a solid meal, with or without RGES, or with GES on the corpus, or with RGES under administration of propranolol. The stimulus was composed of long pulses with a tachygastrial frequency. RESULTS (i) GES at the tachygastrial frequency impaired gastric myoelectrical activity and induced tachygastria (anovaP<0.05). (ii) GES at the tachygastrial frequency suppressed antral contractions (anovaP<0.01) and the effect was stronger with retrograde stimulation than forward stimulation (P<0.05). (iii) GES-induced tachygastria was correlated with antral hypomotility (r=-0.60, P=0.01). (iv) Propranolol and phentolamine abolished GES-induced tachygastria and antral hypomotility. CONCLUSIONS Long-pulse RGES at a tachygastrial frequency suppresses postprandial antral contractions, which is attributed to an induction of tachygastria via the alpha- and beta-adrenergic pathway.
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96
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Xing J. Why Are Visual Images Not Blurred with Lateral Excitation? J Vis 2004. [DOI: 10.1167/4.8.777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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97
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Xing J, Shenoi RA, Wilson PA, Xing JT. Fluid flow through porous media subjected to a boundary condition of variable pressure. Proc Math Phys Eng Sci 2004. [DOI: 10.1098/rspa.2003.1122] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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98
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Xing J, Heeger DJ. Spatial interactions are different at threshold and suprathreshold contrasts. J Vis 2002. [DOI: 10.1167/2.10.103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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99
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Gao L, Xing J, Liu W. [Determination of diflunisal in plasma by RP-HPLC after solid-liquid extraction]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 2002; 33:286-9. [PMID: 11939069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
A RP-HPLC method was developed with solid-liquid extraction technique. Plasma sample was extracted on a macroreticular resin cartridge with methanol--glacial acetic acid (99:1) as elution solvent. After extraction, the assay was carried out on a Spherisorb C18 column with p-phenylphenol as internal standard. The mobile phase is a mixture of methanol--water--glacial acetic acid (66:30:4). UV detection was performed at 250 nm. The flow rate was 1.0 ml.min-1. A good linearity was found at the concentration range from 0.5 to 100 micrograms.ml-1, with the lowest detection limit 0.02 microgram.ml-1 (S/N = 2). The extraction and method recoveries were 91.65% and 97.25% respectively, while the RSD for the within-day and between-day precision were all less than 10%. The above method was applied to determine the plasma concentration of difunisal in three human volunteers after a single oral dosage of 300 mg. Two hours after administration, the plasma concentration of diflunisal reached maximum level. A two compartment method was used to study the pharmacokinetic parameters. The T1/2 alpha and T1/2 beta were 1.40 h and 17.85 h, respectively.
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Gao Y, Xing J, Streuli M, Leto TL, Zheng Y. Trp(56) of rac1 specifies interaction with a subset of guanine nucleotide exchange factors. J Biol Chem 2001; 276:47530-41. [PMID: 11595749 DOI: 10.1074/jbc.m108865200] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Signaling specificity of Rho GTPase pathways is achieved in part by selective interaction between members of the Dbl family guanine nucleotide exchange factors (GEFs) and their Rho GTPase substrates. For example, Trio, GEF-H1, and Tiam1 are a subset of GEFs that specifically activate Rac1 but not the closely related Cdc42. The Rac1 specificity of these GEFs appears to be governed by Rac1-GEF binding interaction. To understand the detailed mechanism underlying the GEF specificity issue, we have analyzed a panel of chimeras made between Rac1 and Cdc42 and examined a series of point mutants of Rac1 made at the switch I, switch II, and beta(2)/beta(3) regions for their ability to interact with and to be activated by the GEFs. The results reveal that Rac1 residues of both the switch I and switch II regions are involved in GEF docking and GEF-mediated nucleotide disruption, because mutation of Asp(38), Asn(39), Gln(61), Tyr(64), or Arg(66)/Leu(67) into Ala results in the loss of GEF binding, whereas mutation at Tyr(32), Asp(65), or Leu(70)/Ser(71) leads to the loss of GEF catalysis while retaining the binding capability. The region between amino acids 53-72 of Rac1 is required for specific recognition and activation by the GEFs, and Trp(56) in beta(3) appears to be the critical determinant. Introduction of Trp(56) to Cdc42 renders it fully responsive to the Rac-specific GEF in vitro and in cells. Further, a polypeptide derived from the beta(3) region of Rac1 including the Trp(56) residue serves as a specific inhibitor for Rac1 interaction with the GEFs. Taken together, these results indicate that Trp(56) is the necessary and sufficient determinant of Rac1 for discrimination by the subset of Rac1-specific GEFs and suggest that a compound mimicking Trp(56) action could be explored as an interfering reagent specifically targeting Rac1 activation.
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