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Hou XD, Fu CH, Zhang P, Wang XK, Yi K, You T. [Effect of continuous blood purification for acute renal injury after acute Stanford type A aortic dissection]. Zhonghua Yi Xue Za Zhi 2021; 101:333-338. [PMID: 34645251 DOI: 10.3760/cma.j.cn112137-20200527-01682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effect of continuous renal replacement therapy (CRRT) on acute kidney injury (AKI) after acute Stanford type A aortic dissection (ATTAD). Methods: In this study, 120 patients with AKI after ATTAD surgery treat in Gansu Provincial People's Hospital were selected as research objects. Among them, there were 86 males (71.7%) and 34 females (28.3%) with a mean age of (55±5) years. These patients were randomly divided into experimental group (n=60) and control group (n=60) with stratified random sampling. CRRT and intermittent hemodialysis (IHD) were performed in the experimental group and the control group respectively. The therapeutic effect of CRRT on ATTAD patients with AKI was evaluated by blood purification index, renal function index, Sequential Organ Failure Assessment (SOFA) score, inflammatory level, hemodynamic index and fluid infusion volume. Results: The two treatment schemes both had considerable therapeutic effects on the condition of patients, but the therapeutic effect of CRRT was more superior. In the patients treated with CRRT, the levels of serium creatinine (SCr), blood urea nitrogen (BUN) and blood lactic acid (Lac) were all lower than those in the control group (all P<0.05). The time of staying in intensive care units (ICU), the period of oliguria, the times of renal replacement therapy, the time from the first dialysis to the last dialysis and the total hospital stay in the experimental group were all shorter than those in the control group (all P<0.05). The volume of fluid infusion was less and the hemodynamic index was better than that in the control group, but there was no significant difference in hospital mortality between the two groups (P>0.05). The levels of interleukin (IL)-6, IL-8 and C-reactive protein (CRP) in the experimental group were (21.9±1.8) ng/L, (18.6±1.4) ng/L and (22.7±2.2) mg/L, respectively, which were all significantly lower than those in control group ((27.9±3.2) ng/L, (28.3±1.4) ng/L, (60.1±2.5)mg/L, respectively; t=14.527, 13.255, 11.247, all P<0.05). The scores of SOFA at all time points in the experimental group were all lower than those in the control group (all P<0.05). Conclusion: Compared with IHD, CRRT brings no significant reduction in hospital mortality in patients with AKI after ATTAD, but shows better prognosis.
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Affiliation(s)
- X D Hou
- Gansu Provincial People's Hospital, Cardiac surgery, Lanzhou 730000, China
| | - C H Fu
- Gansu Provincial People's Hospital, Cardiac surgery, Lanzhou 730000, China
| | - P Zhang
- Gansu Provincial People's Hospital, Cardiac surgery, Lanzhou 730000, China
| | - X K Wang
- Gansu Provincial People's Hospital, Cardiac surgery, Lanzhou 730000, China
| | - K Yi
- Gansu Provincial People's Hospital, Cardiac surgery, Lanzhou 730000, China
| | - T You
- Gansu Provincial People's Hospital, Cardiac surgery, Lanzhou 730000, China
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2
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Ding F, You T, Hou XD, Yi K, Liu XG, Zhang P, Wang XK. MiR-21 regulates pulmonary hypertension in rats via TGF-β1/Smad2 signaling pathway. Eur Rev Med Pharmacol Sci 2020; 23:3984-3992. [PMID: 31115027 DOI: 10.26355/eurrev_201905_17828] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To investigate the effects of micro ribonucleic acid (miR)-21 on pulmonary hypertension (PH) in rats via regulating tumor growth factor-β1 (TGF-β1)/mothers against decapentaplegic homolog 2 (Smad2) signaling pathway and the possible underlying mechanism. MATERIALS AND METHODS MiR-21 inhibition vector (pLKO-anti-miR-21) was first constructed. The rat model of PH was established by hypoxia feeding induction. A total of three groups were established, including: blank control group, model group and miR-21 low-expression group were set up, with 12 rats in each group. The expression level of miR-21 in lung tissues of rats in each group was detected via quantitative polymerase chain reaction (qPCR). The right ventricle systolic pressure (RVSP) and right ventricular hypertrophy index (RVHI) of rats in each group were measured. The pathological changes in lung tissues of rats were detected using hematoxylin and eosin (H&E) staining. Terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) staining was used to detect the level of apoptosis in lung tissues of rats in each group. Furthermore, Western blotting was adopted to detect the expression levels of TGF-β1/Smad2 signal pathway-related proteins and apoptosis-related proteins in lung tissues of rats in each group. RESULTS Compared with blank control group, the expression level of miR-21 in lung tissues of rats in model group was significantly increased (p<0.01). Meanwhile, miR-21 expression in lung tissues of rats in miR-21 low-expression group was significantly decreased by transfection of miR-21 inhibition vector (p<0.01). The RVSP and RVHI of rats in model group were significantly higher than those of blank control group and miR-21 low-expression group (p<0.01). H&E staining results indicated that the degree of lung tissue injury in model group was remarkably higher than blank control group and miR-21 low-expression group (p<0.01). According to TUNEL staining results, the number of apoptotic cells in lung tissues of rats in model group was markedly smaller than that of miR-21 low-expression group (p<0.01). Moreover, the expression level of Caspase 3 in lung tissues of rats in model group was significantly lower than that of miR-21 low-expression group, while the expression level of B-cell lymphoma 2 (Bcl-2)/Bcl-2-associated X protein (BAX) was markedly higher. The expression levels of TGF-β1 and phosphorylated (p)-Smad2 in lung tissues of rats in model group were evidently higher than those of blank control group (p<0.01). In addition, lowly expressed miR-21 could effectively reduce the expressions of TGF-β1 and p-Smad2 (p<0.01). CONCLUSIONS MiR-21 regulates the symptoms of PH in rats by activating TGF-β1/Smad2 signaling pathway.
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Affiliation(s)
- F Ding
- Department of Cardiovascular, Gansu Province Hospital, Lanzhou, China.
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3
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Ding F, You T, Hou XD, Yi K, Liu XG, Zhang P, Wang XK. MiR-21 regulates pulmonary hypertension in rats via TGF-β1/Smad2 signaling pathway. Eur Rev Med Pharmacol Sci 2020; 24:8625. [PMID: 32964946 DOI: 10.26355/eurrev_202009_22758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The article "MiR-21 regulates pulmonary hypertension in rats via TGF-β1/Smad2 signaling pathway, by F. Ding, T. You, X.-D. Hou, K. Yi, X.-G. Liu, P. Zhang, X.-K. Wang, published in Eur Rev Med Pharmacol Sci 2019; 23 (9): 3984-3992-DOI: 10.26355/eurrev_201905_17828-PMID: 31115027" has been withdrawn from the authors. The Publisher apologizes for any inconvenience this may cause. https://www.europeanreview.org/article/17828.
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Affiliation(s)
- F Ding
- Department of Cardiovascular, Gansu Province Hospital, Lanzhou, China
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4
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Zhou L, Jiang M, Shen H, You T, Ding Z, Cui Q, Ma Z, Yang F, Xie Z, Shi H, Su J, Cao L, Lin J, Yin J, Dai L, Wang H, Wang Z, Yu Z, Ruan C, Xia L. Clinical and molecular insights into Glanzmann's thrombasthenia in China. Clin Genet 2018; 94:213-220. [PMID: 29675921 DOI: 10.1111/cge.13366] [Citation(s) in RCA: 7] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 04/08/2018] [Accepted: 04/09/2018] [Indexed: 12/19/2022]
Abstract
Glanzmann's thrombasthenia (GT) is a rare bleeding disorder characterized by spontaneous mucocutaneous bleeding. The disorder is caused by quantitative or qualitative defects in integrin αIIbβ3 (encoded by ITGA2B and ITGB3) on the platelet and is more common in consanguineous populations. However, the prevalence rate and clinical characteristics of GT in non-consanguineous populations have been unclear. We analyzed 97 patients from 93 families with GT in the Han population in China. This analysis showed lower consanguinity (18.3%) in Han patients than other ethnic populations in GT-prone countries. Compared with other ethnic populations, there was no significant difference in the distribution of GT types. Han females suffered more severe bleeding and had a poorer prognosis. We identified a total of 43 different ITGA2B and ITGB3 variants, including 25 previously unidentified, in 45 patients. These variants included 14 missense, 4 nonsense, 4 frameshift, and 3 splicing site variants. Patients with the same genotype generally manifested the same GT type but presented with different bleeding severities. This suggests that GT clinical phenotype does not solely depend on genotype. Our study provides an initial, yet important, clinical and molecular characterization of GT heterogeneity in China.
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Affiliation(s)
- L Zhou
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Hematology department, Affiliated Hospital of Nantong University, Nantong, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - M Jiang
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - H Shen
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - T You
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - Z Ding
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - Q Cui
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - Z Ma
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - F Yang
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - Z Xie
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - H Shi
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - J Su
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - L Cao
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - J Lin
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - J Yin
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - L Dai
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - H Wang
- Department of Pediatrics/Section of Genetics, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Z Wang
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - Z Yu
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - C Ruan
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China
| | - L Xia
- Key Laboratory of Thrombosis & Hemostasis of Ministry of Health, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Suzhou, China.,Collaborative Innovation Center of Hematology, Soochow University, Suzhou, China.,Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma
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5
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Hoffman F, Gavaghan D, Osborne J, Barrett I, You T, Ghadially H, Sainson R, Wilkinson R, Byrne H. A mathematical model of antibody-dependent cellular cytotoxicity (ADCC). J Theor Biol 2018; 436:39-50. [DOI: 10.1016/j.jtbi.2017.09.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 09/26/2017] [Accepted: 09/28/2017] [Indexed: 10/18/2022]
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Sun WZ, Jiang MY, Ren L, Dang J, You T, Yin FF. Respiratory signal prediction based on adaptive boosting and multi-layer perceptron neural network. Phys Med Biol 2017; 62:6822-6835. [PMID: 28665297 DOI: 10.1088/1361-6560/aa7cd4] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
To improve the prediction accuracy of respiratory signals using adaptive boosting and multi-layer perceptron neural network (ADMLP-NN) for gated treatment of moving target in radiation therapy. The respiratory signals acquired using a real-time position management (RPM) device from 138 previous 4DCT scans were retrospectively used in this study. The ADMLP-NN was composed of several artificial neural networks (ANNs) which were used as weaker predictors to compose a stronger predictor. The respiratory signal was initially smoothed using a Savitzky-Golay finite impulse response smoothing filter (S-G filter). Then, several similar multi-layer perceptron neural networks (MLP-NNs) were configured to estimate future respiratory signal position from its previous positions. Finally, an adaptive boosting (Adaboost) decision algorithm was used to set weights for each MLP-NN based on the sample prediction error of each MLP-NN. Two prediction methods, MLP-NN and ADMLP-NN (MLP-NN plus adaptive boosting), were evaluated by calculating correlation coefficient and root-mean-square-error between true and predicted signals. For predicting 500 ms ahead of prediction, average correlation coefficients were improved from 0.83 (MLP-NN method) to 0.89 (ADMLP-NN method). The average of root-mean-square-error (relative unit) for 500 ms ahead of prediction using ADMLP-NN were reduced by 27.9%, compared to those using MLP-NN. The preliminary results demonstrate that the ADMLP-NN respiratory prediction method is more accurate than the MLP-NN method and can improve the respiration prediction accuracy.
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Affiliation(s)
- W Z Sun
- Institute of Information Science and Engineering, Shandong University, Shandong, People's Republic of China. Department of Radiation Oncology, Duke University Cancer Center, Durham, NC, United States of America
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7
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Hou XD, Ding F, Wang XK, Liu XG, Yi K, Zhang P, You T. Concomitant mitral valve replacement and tricuspid valvuloplasty for severe mitral stenosis. Eur Rev Med Pharmacol Sci 2017; 21:3436-3440. [PMID: 28829498] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OBJECTIVE The purpose of this work is to analyze the clinical results of treating severe mitral stenosis (MS) with mild to moderate functional tricuspid regurgitation (FTR) with mitral valve replacement (MVR) alone or together with two different methods of tricuspid valvuloplasty (TVP). PATIENTS AND METHODS We split 132 patients into three groups: simple MVR with 47 cases (control group), MVR+ TVP (De Vega loop reduction) with 45 cases (observation group 1) and MVR+ TVP (Edwards MC3 tricuspid forming ring implantation) with 40 cases (observation group 2). RESULTS As expected, surgery for both observation groups was longer than for the control group, but we found no differences in aortic clamping time, cardiopulmonary bypass time, perioperative complications, and postoperative hospital stay. We found significantly fewer complications in both observation groups compared to the control group. After surgery, the diameter of the tricuspid valve ring and the maximum reflux bundle were significantly lower in the observation groups compared to the control group. CONCLUSIONS Overall, the long-term clinical effect of combined MVR and TVP to treat severe MS with mild to moderate FTR is better than using the simple MVR procedure. Our results also suggest that the Edwards MC3 tricuspid forming ring implantation is superior to the De Vega loop reduction.
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Affiliation(s)
- X-D Hou
- Department of Cardiac Surgery, Gansu Province People's Hospital, Lanzhou, Gansu Province, China.
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8
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Nawai A, Leveille S, Foust J, Shi L, You T. PAIN CHARACTERISTICS AND PAIN CATASTROPHIZING IN COMMUNITY-LIVING OLDER ADULTS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- A. Nawai
- Nursing, University of Massachusetts Boston, Quincy, Massachusetts,
| | - S.G. Leveille
- Nursing, University of Massachusetts Boston, Quincy, Massachusetts,
- Department of Medicine,Beth Israel Deaconess Medical Center, Boston, Massachusetts,
- Harvard Medical School, Boston, Massachusetts
| | - J.B. Foust
- Nursing, University of Massachusetts Boston, Quincy, Massachusetts,
| | - L. Shi
- Nursing, University of Massachusetts Boston, Quincy, Massachusetts,
| | - T. You
- Nursing, University of Massachusetts Boston, Quincy, Massachusetts,
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Ogawa E, You T, Thapa S, Cai Y, Yeh G, Wayne P, Shi L, Leveille S. EFFECTS OF TAI CHI ON MULTISITE PAIN AND PHYSICAL FUNCTION IN OLDER ADULTS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- E. Ogawa
- University of Massachusetts Boston, Boston, Massachusetts,
| | - T. You
- University of Massachusetts Boston, Boston, Massachusetts,
| | - S. Thapa
- University of Massachusetts Boston, Boston, Massachusetts,
| | - Y. Cai
- University of Massachusetts Boston, Boston, Massachusetts,
| | - G. Yeh
- Beth Israel Deaconess Medical Center, Boston, Massachusetts,
- Harvard Medical School, Boston, Massachusetts
| | - P. Wayne
- Harvard Medical School, Boston, Massachusetts
| | - L. Shi
- University of Massachusetts Boston, Boston, Massachusetts,
| | - S.G. Leveille
- University of Massachusetts Boston, Boston, Massachusetts,
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Cai Y, Leveille S, Hausdorff J, Bean J, Manor B, You T. FROM HEAD TO TOE, FREQUENCY OF COGNITIVE ACTIVITIES IS ASSOCIATED WITH SHORTER FOOT REACTION TIME. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Y. Cai
- University of Massachusetts Boston, Boston, Massachusetts,
| | - S.G. Leveille
- University of Massachusetts Boston, Boston, Massachusetts,
- Beth Israel Deaconess Medical Center, Boston, Massachusetts,
- Harvard Medical School, Boston, Massachusetts,
| | | | - J.F. Bean
- Harvard Medical School, Boston, Massachusetts,
- Veterans Administration Boston Health System, Boston, Massachusetts,
| | - B. Manor
- Harvard Medical School, Boston, Massachusetts,
- Hebrew SeniorLife, Boston, Massachusetts
| | - T. You
- University of Massachusetts Boston, Boston, Massachusetts,
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11
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Thapa S, Leveille S, Bean J, McLean R, You T. GENDER DIFFERENCES IN ASSOCIATION OF PAIN AND PHYSICAL PERFORMANCE WITH FEAR OF FALLING. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- S. Thapa
- University of Massachusetts Boston, Boston, Massachusetts
| | - S.G. Leveille
- University of Massachusetts Boston, Boston, Massachusetts
| | - J.F. Bean
- Spaulding Center for Lifelong Health and Fitness, Partners Health Care, Boston, Massachusetts,
| | - R. McLean
- Hebrew Senior Life Institute for Aging Research, Boston, Massachusetts,
| | - T. You
- University of Massachusetts Boston, Boston, Massachusetts
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12
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Bai L, Zhou W, Zhang WT, Huang W, You T, Chen P, Zhang HL. [Correlation between morphogical factor of lateral plateau fracture and meniscus injury]. Beijing Da Xue Xue Bao Yi Xue Ban 2016; 48:274-278. [PMID: 27080280] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
OBJECTIVE To analyze morphological character of lateral tibial plateau fracture fragment, and its correlation to the presence of a meniscus injury in tibial plateau fractures. METHODS A total of 79 consecutive patients of the simple lateral tibial plateau fractures from July 2011 to July 2015 were included in this study, with 65 males and 14 females with an average age of (34.3±7.2) years and 22-61 years. According to Schatzker classification, 21 cases were of Type I, 41 cases Type II, and 17 cases Type III. The characteristics of lateral tibial plateau fractures were evaluated by plain X-ray and magnetic resonance imaging (MRI). The type and severity of meniscus injury were diagnosed by MRI scan. Three-dimensional measurements of the lateral fragment width (LFW), the lateral plateau depression (LPD), the coronal angulation of lateral fragment (CALF), and tibial plateau widening (TPW) were measured with Picture Archiving and Communication Systems(PACS) software. The patients with and without meniscus injuries were divided into different groups and analyzed respectively. Comparison of the above measurements between the two groups was analyzed by independent t test. RESULTS In all the 79 lateral tibial plateau fracture patients, 26 cases (32.9%) of meniscus injuries were detected by MRI. Among all the meniscus injury cases, 3 were of Schatzker I, 16 Schatzker II, and 7 Schatzker III. In meniscus intact group, the average LFW was (22.0±2.8) mm while in meniscus injury group it was (21.3± 3.3) mm (t=-1.008, P=0.317).The average LPD of non meniscus injury group was (5.4±2.8) mm, while in meniscus injury group was (8.7±2.8) mm (t=4.98, P=0.001). The average CALF of the two groups were 9.1°±6.1°and 10.6°± 7.1°, and there was no significant difference between the two groups (t=0.38, P=0.831). The average TPW was (3.0± 1.1) mm, and (4.8±1.7) mm of the two groups. There were significant differences between the two groups (t=5.216, P=0.001). CONCLUSION There was no obvious correlation between the LFD and meniscus injury. The CALF of lateral tibial plateau fracture had no significant correlation with meniscus injury either. The degree of LPD and TPW may indicate injury of the meniscus in tibial plateau fractures.
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Affiliation(s)
- L Bai
- Department of Sports Medicine, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong, China
| | - W Zhou
- Department of Radiology, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong, China
| | - W T Zhang
- Department of Sports Medicine, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong, China
| | - W Huang
- Department of Sports Medicine, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong, China
| | - T You
- Department of Sports Medicine, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong, China
| | - P Chen
- Department of Sports Medicine, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong, China
| | - H L Zhang
- Department of Sports Medicine, Peking University Shenzhen Hospital, Shenzhen 518036, Guangdong, China
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13
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Yoon S, Jeong H, Kim H, You T. A case of significant refractive change in nodular posterior scleritis. Acta Ophthalmol 2015. [DOI: 10.1111/j.1755-3768.2015.0437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Yoon
- Department of Ophthalmology; Pureun Eye Center; Jeonju South-Korea
| | - H. Jeong
- Department of Ophthalmology; Pureun Eye Center; Jeonju South-Korea
| | - H. Kim
- Department of Ophthalmology; Pureun Eye Center; Jeonju South-Korea
| | - T. You
- Department of Ophthalmology; Pureun Eye Center; Jeonju South-Korea
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14
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Dang J, Yin F, You T, Dai C, Wang J. TH-CD-303-12: Sliding Motion Compensated Simultaneous 4D-CBCT Reconstruction. Med Phys 2015. [DOI: 10.1118/1.4926247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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15
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You T, Dang J, Dai C, Yin F. SU-E-T-347: Effect of MLC Leaf Position Inaccuracy On Dose Distribution for Spinal SBRT with Different Energies and Dose Rates. Med Phys 2015. [DOI: 10.1118/1.4924708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Li J, You T, Jing J. MiR-125b inhibits cell biological progression of Ewing's sarcoma by suppressing the PI3K/Akt signalling pathway. Cell Prolif 2014; 47:152-60. [PMID: 24517182 DOI: 10.1111/cpr.12093] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Accepted: 10/24/2013] [Indexed: 12/18/2022] Open
Abstract
OBJECTIVES Increasing evidence has suggested the close relationship between microRNAs (miRNAs) dysregulation and the carcinogenesis of Ewing's sarcoma (ES), among of which miR-125b has been reported to be decreased in ES tissues recently. Strikingly, ectopic expression of miR-125b could suppress cell proliferation of ES cell line A673, suggesting the tumor suppressor role of miR-125b in ES. However, the other accurate mechanistic functions and relative molecule mechanisms are largely unknown. MATERIALS AND METHODS Herein, we completed a series of experiments to investigate the role of miR-125b in Ewing's sarcoma. We restored the expression of miR-125b in ES cell line A673 through transfection with miR-125b mimics. To further understand the role of miR-125b in ES, we detected the effects of miR-125b on the cell proliferation, migration and invasion, cell cycle as well as cell apoptosis. RESULTS We found that restored expression of miR-125b in ES cell line A673 inhibited cell proliferation, migration and invasion, arrested cell cycle progression, and induced cell apoptosis. Moreover, bioinformatic prediction suggested the oncogene, phosphoinositide-3-kinase catalytic subunit delta (PIK3CD), was a target gene of miR-125b in ES cells. Further quantitative RT-PCR and western blot assays identified over-expression of miR-125b suppressed the expression of PIK3CD mRNA and protein. PIK3CD participates in regulating the PI3K signaling pathway, which has been reported to play an important role in the development of ES. Suppression of PIK3CD down-regulated the expression of phospho-AKT and phospho-mTOR proteins and inhibited the biologic progression of A673 cells. CONCLUSIONS Collectively, these data suggest that miR-125b functions as a tumor suppressor by targeting the PI3K/Akt/mTOR signaling pathway, and may provide potential therapy strategy for ES patients by targeting miRNA expression.
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Affiliation(s)
- J Li
- Department of Orthopaedics, The Second Hospital of Anhui Medical University, Hefei, Anhui, 230601, China
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Kim J, Lee HS, In YH, Moon HG, Lee M, Lee JW, Kim MK, Kim J, You T, Lee E, Park J, Noh DY, Kim S, Han W. Abstract P4-04-09: Extensive novel hybrid isoforms revealed by RNA sequencing of 120 primary breast cancer samples. Cancer Res 2013. [DOI: 10.1158/0008-5472.sabcs13-p4-04-09] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Introduction
Recent studies of next generation sequencing (NGS) have highlighted the extensive transcriptional heterogeneity of cancer cells. Alternative splicing is one of the evolutionary process by which cells and tissues achieve their specificity within central dogma. Also it is highly assumed to contribute to oncogenesis and thought to be a critical mechanism how cancer cells gain resistance to therapeutic agents and adapt to various circumstances. Relevance of differential splicing in breast cancer biology is mostly unknown. We performed whole transcriptome sequencing (RNA-Seq) to reveal novel splicing alterations among 120 primary breast cancer samples.
Materials and Method
Total RNA was prepared using the Illumina TrueSeq™ RNA sample Preparation Kit and TrueSeq mRNA library was constructed. Clustering and sequencing was done using Illumina HiSeq 2000. RNA-Seq reads were aligned to human reference genome(hg19) using TopHat software and expression was measured using cufflinks software. We used tissues extracted from previously collected 120 fresh-frozen primary breast cancer samples obtained after surgical resection whose clinicopathological data are available. Patients undergone neoadjuvant systemic therapies or stage lV disease at diagnosis were excluded. Thirty-six(30%) cases occurred distant metastasis during follow up. Hormone receptor(HR) was positive in 61(50.8%) samples, 20(16.7%) had HER2 oncogene overexpression and 36(30%) were triple negative breast cancer.
Results and discussion
Total 11345 novel isoforms were detected among 120 tumors. Isoforms of pseudo-genes and exon skipping of the ‘non-coding exon’ were excluded. Splice variants detected in normal reference were sorted out as well. 4045 were in-frame exon skipping and 4960 were off-frame exon skipping which may lead to protein truncation. 5036 were private exon skipping and 3969 isoforms were detected recurrently in more than 2 samples. To minimize false positivity we confined ‘exon skipping’ analysis to those with the expression level (Fragments per kilo-base of exon per million fragments mapped, FPKM) of the skipped exon below 0.1 compared to the adjacent exons. Mean number of exon skipping events per sample was 196.8 (range 75-299, SD 35.9). There were no differences in numbers of exon skipping event among breast cancer subtypes nor distant metastasis. We have identified novel exon skipping in ESR1, CHEK2, EIF3E, FGFR, MAP2K, PIK3R2, TERT, VAV3 genes which is strongly suspected to be novel driver isoforms and is under validation process.
Conclusion We performed whole-transcriptome sequencing with a large set of primary breast cancer samples and revealed extensive transcriptional heterogeneity by isoform profiling. As distinguishing the natural transcriptomic dynamics from oncogenic ‘driver’ isoform is a major challenge, validation and functional studies are ongoing.
Citation Information: Cancer Res 2013;73(24 Suppl): Abstract nr P4-04-09.
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Affiliation(s)
- J Kim
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - H-S Lee
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - Y-H In
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - H-G Moon
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - M Lee
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - JW Lee
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - MK Kim
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - J Kim
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - T You
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - E Lee
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - J Park
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - D-Y Noh
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - S Kim
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
| | - W Han
- Seoul National University Hospital, Seoul, Korea; Macrogen Inc, Korea; Bioconvergence Research Center, Korea; Geference Inc, Korea
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Park M, Lee K, You T, Suh S, Kim H, Choi Y, Hong G, Kim O, Yi N, Suh K. The “ABO Cross-transplantation Problem” in Liver Transplantation in Korea. Transplant Proc 2013; 45:2878-9. [DOI: 10.1016/j.transproceed.2013.08.046] [Citation(s) in RCA: 3] [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: 10/26/2022]
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Liu J, Zhou W, You T, Li F, Wang E, Dong S. Detection of hydrazine, methylhydrazine, and isoniazid by capillary electrophoresis with a palladium-modified microdisk array electrode. Anal Chem 2012; 68:3350-3. [PMID: 21619270 DOI: 10.1021/ac9604696] [Citation(s) in RCA: 127] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A palladium particle-modified carbon fiber microdisk array electrode was designed and employed in capillary electrophoresis for the simultaneous detection of hydrazine, methylhydrazine, and isoniazid. The Pd-modified microdisk electrode had high catalytic ability for hydrazines and exhibited good reproducibility and stability. The response for hydrazine was linear over 3 orders of magnitude with a correlation coefficient of 0.993. The detection limits for hydrazine, methylhydrazine, and isoniazid were 1.2, 2.1, and 6.2 pg, respectively.
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Affiliation(s)
- J Liu
- Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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20
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Alzate O, You T, Claybon M, Osorio C, Curtiss A, Dean DH. Effects of disulfide bridges in domain I of Bacillus thuringiensis Cry1Aa delta-endotoxin on ion-channel formation in biological membranes. Biochemistry 2007; 45:13597-605. [PMID: 17087513 DOI: 10.1021/bi061474z] [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] [Indexed: 11/29/2022]
Abstract
The delta-endotoxin family of toxic proteins represents the major component of the insecticidal capability of the bacterium Bacillus thuringiensis. Domain I of the toxins, which is largely alpha-helical, has been proposed to unfold at protein entry into the membrane of a target insect, following models known as the penknife and umbrella models. We extended the analysis of a previous work in which four disulfide bridges were constructed in domain I of the Cry1Aa delta-endotoxin that putatively prevented unfolding during membrane partitioning. Using bioassays and voltage clamping of whole insect midgut instead of artificial lipid bilayers, it was found that, while toxicity and inhibition of the short-circuit current were reduced, only one of the disulfide bridges eliminated the activity of the toxins in the insect midgut membrane, and in that case, the loss of toxicity was due to the single amino acid substitution, R99C. It is proposed that at least alpha helices 4, 5, 6, and 7 and domain II partition in the midgut membranes of target insects, in support of an insertion model in which the whole protein translocates into the midgut membrane.
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Affiliation(s)
- O Alzate
- Biochemistry Department, The Ohio State University, 484 West 12th Avenue, Columbus, Ohio 43210, USA. alzate@ neuro.duke.edu
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You T, Murphy KM, Lyles MF, Demons JL, Lenchik L, Nicklas BJ. Addition of aerobic exercise to dietary weight loss preferentially reduces abdominal adipocyte size. Int J Obes (Lond) 2006; 30:1211-6. [PMID: 16446745 DOI: 10.1038/sj.ijo.0803245] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To determine if hypocaloric diet, diet plus low-intensity exercise, and diet plus high-intensity exercise differentially influence subcutaneous abdominal and gluteal adipocyte size in obese individuals. DESIGN Longitudinal intervention study of hypocaloric diet, diet plus low-intensity exercise, and diet plus high-intensity exercise (calorie deficit = 2800 kcal/week, 20 weeks). SUBJECTS Forty-five obese, middle-aged women (BMI = 33.0+/-0.6 kg/m2, age = 58+/-1 years). MEASUREMENTS Body composition testing and adipose tissue biopsies were conducted before and after the interventions. Subcutaneous abdominal and gluteal adipocyte size was determined. RESULTS All three interventions reduced body weight, fat mass, percent fat, and waist and hip girths to a similar degree. Diet only did not change subcutaneous abdominal adipocyte size, whereas both diet plus exercise groups significantly reduced abdominal adipocyte size. Changes in abdominal adipocyte size in the diet plus exercise groups were significantly different from that of the diet group. Gluteal adipocyte size decreased similarly in all three groups. CONCLUSION Addition of exercise training to dietary weight loss preferentially reduces subcutaneous abdominal adipocyte size in obese women. This may be of importance for the treatment of health complications associated with subcutaneous abdominal adiposity.
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Affiliation(s)
- T You
- J Paul Sticht Center on Aging, Section on Gerontology and Geriatric Medicine, Department of Internal Medicine, Winston-Salem, NC 27157, USA.
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22
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Arroyo JG, You T, Bossi KE. Illuminated lens fixator for bimanual pars plana lensectomy. Ophthalmic Surg Lasers 2001; 32:438-40. [PMID: 11563792] [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] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Pars plana vitrectomy and lensectomy are effective methods for removing posteriorly dislocated lens material. We describe an illuminated nucleus fixator that assists in the removal of posteriorly dislocated lens fragments. We tested the efficacy of the illuminated nucleus fixator compared to a standard endoilluminator in removing lens nuclei from the vitreous cavity of a cadaveric eye model. Use of the illuminated nucleus fixator as compared to a standard endoilluminator significantly reduced the time needed to remove lens nuclei from the vitreous cavity. This instrument could penetrate and fixate lens nuclei and could safely stabilize small and intermediate-sized lens fragments against the activated fragmatome. Bimanual lensectomy using the illuminated nucleus fixator significantly shortens the surgical time needed to remove posteriorly dislocated lens fragments. Shortening the surgical time for lensectomy may minimize such complications as retinal tears, trauma, and phototoxicity.
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Affiliation(s)
- J G Arroyo
- Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02114, USA.
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23
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You T. Determination of barbituric acid and 2-thiobarbituric acid with end-column electrochemical detection by capillary electrophoresis. Talanta 2000; 51:1213-8. [DOI: 10.1016/s0039-9140(00)00312-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/1999] [Revised: 01/24/2000] [Accepted: 01/24/2000] [Indexed: 10/18/2022]
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Leuschner M, Dietrich CF, You T, Seidl C, Raedle J, Herrmann G, Ackermann H, Leuschner U. Characterisation of patients with primary biliary cirrhosis responding to long term ursodeoxycholic acid treatment. Gut 2000; 46:121-6. [PMID: 10601067 PMCID: PMC1727784 DOI: 10.1136/gut.46.1.121] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND In some patients with primary biliary cirrhosis, ursodeoxycholic acid causes full biochemical normalisation of laboratory data; in others, indexes improve but do not become normal. AIMS To characterise complete and incomplete responders. METHODS Seventy patients with primary biliary cirrhosis were treated with ursodeoxycholic acid 10-15 mg/kg/day and followed up for 6-13 years. RESULTS In 23 patients (33%) with mainly stage I or II disease, cholestasis indexes and aminotransferases normalised within 1-5 years, except for antimitochondrial antibodies. Histological findings improved. Indexes were not normalised in 47 patients (67%) although the improvement of their biochemical functions parallelled the trend in the first group. In these incomplete responders histological findings improved to a lesser extent. The only difference between the two groups before treatment was higher levels of alkaline phosphatase and gamma glutamyl transpeptidase in the incomplete responders. At onset of treatment the discriminant value separating responders from incomplete responders was 660 U/l for alkaline phosphatase and 131 U/l for gamma glutamyl transpeptidase. One year later it was 239 and 27 U/l (overall predictive value for responders 92%, for incomplete responders 81%). There were no differences between the two groups concerning immune status, antimitochondrial antibody subtypes, liver histology, or any other data. HLA-B39, DRB1*08, DQB1*04 dominated in both groups. CONCLUSIONS In patients with mainly early stages of primary biliary cirrhosis, higher values of alkaline phosphatase and gamma glutamyl transpeptidase are the only biochemical indexes which allow discrimination between patients who will completely or incompletely respond to ursodeoxycholic acid treatment.
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Affiliation(s)
- M Leuschner
- Centre of Internal Medicine, Johann Wolfgang Goethe-Universität, Frankfurt am Main, Germany
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25
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You T. End-column amperometric detection of melatonin by high performance capillary electrophoresis. Talanta 1999; 49:517-21. [DOI: 10.1016/s0039-9140(99)00042-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/1998] [Revised: 01/04/1999] [Accepted: 01/05/1999] [Indexed: 11/16/2022]
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26
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You T, Niu L, Gui JY, Dong S, Wang E. Detection of hydrazine, methylhydrazine and isoniazid by capillary electrophoresis with a 4-pyridyl hydroquinone self-assembled microdisk platinum electrode. J Pharm Biomed Anal 1999; 19:231-7. [PMID: 10698584 DOI: 10.1016/s0731-7085(98)00130-7] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Capillary electrophoresis (CE)/electrochemical detection (EC) for the simultaneous detection of hydrazine, methylhydrazine, and isoniazid has been developed with a 4-pyridyl hydroquinone self-assembled microdisk platinum electrode. Such an electrode has very high catalytic ability for hydrazines and they could be detected even at 0.0 V. The responses for hydrazine, methylhydrazine, and isoniazid are linear over 3 orders of detected concentration and of magnitude of 0.2-400 microM, 0.2-400 microM, 0.5 microM-2 mM, with correlation coefficients of 0.9998, 0.9991, and 0.9982, respectively. And they could be detected to levels of 0.1, 0.1 and 0.2 microM, respectively. This modified electrode was found to be very stable and reproducible when continuously used as detector for capillary electrophoresis for period of at least 4 weeks with no apparent loss of response.
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Affiliation(s)
- T You
- Laboratory of Electroanalytical Chemistry and National Analytical Research Center of Electrochemistry and Spectroscopy, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, People's Republic of China
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You T, Yang X, Wang E. Determination of sulfadiazine and sulfamethoxazole by capillary electrophoresis with end-column electrochemical detection. Analyst 1998; 123:2357-60. [PMID: 10396813 DOI: 10.1039/a805488f] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Capillary electrophoresis (CE) with end-column electrochemical detection (EC) of sulfadiazine (SDZ) and sulfamethoxazole (SMZ) is described. Under the optimum conditions, SDZ and SMZ were separated satisfactorily, and a highly sensitive and stable response was obtained at a potential of 1.1 V versus Ag/AgCl. Optimized end-column detection provides detection limits as low as 0.1 microM for both compounds, which corresponds to 0.024 and 0.021 fmol with peak efficiencies of 394,000 and 335,000 theoretical plates for SDZ and SMZ, respectively. The calibration graph was linear over three order of magnitude. The relative standard deviations (n = 12) of peak currents and migration times were 2.3 and 2.7%, and 0.8 and 1.3%, respectively, for the two compounds. The proposed method was applied to the analysis of tablets and human urine samples with satisfactory results.
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Affiliation(s)
- T You
- Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, China
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Leuschner M, Güldütuna S, You T, Hübner K, Bhatti S, Leuschner U. Ursodeoxycholic acid and prednisolone versus ursodeoxycholic acid and placebo in the treatment of early stages of primary biliary cirrhosis. J Hepatol 1996; 25:49-57. [PMID: 8836901 DOI: 10.1016/s0168-8278(96)80327-8] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Ursodeoxycholic acid probably is not able to cure primary biliary cirrhosis. Therefore in this study ursodeoxycholic acid was administered together with prednisolone, since monotherapy with glucocorticoids has been shown to have some positive effects. METHODS Thirty patients with primary biliary cirrhosis (stages I-III) were entered into the study. Fifteen were treated with ursodeoxycholic acid 10 mg.kg-1.day-1 and placebo (group A), 15 with ursodeoxycholic acid and 10 mg prednisolone (group B) for 9 months. Apart from the usual laboratory examinations, liver biopsies were taken from 29 patients before and after therapy. RESULTS Liver enzymes decreased significantly compared to the initial values in both groups (p < 0.001), but in group B cholestasis-indicating enzymes and the immunoglobulins G and A improved more rapidly. Between both groups the differences for AP, GGT, IgG, IgA and gamma-globulins were significant (p < 0.05), but only for short terms. In group B, liver histology improved significantly (p < 0.003), which correlated with the decrease of IgG. Ursodeoxycholic acid became the predominant bile acid in the serum. Toxic bile acids did not increase. Bone densitometry revealed a slight deterioration of preexisting osteoporosis in one patient. CONCLUSIONS Although combination therapy with ursodeoxycholic acid and prednisolone was not superior to monotherapy with ursodeoxycholic acid with regard to liver function tests, it had a highly beneficial influence on liver histology. In our previous trials with monotherapy histology remained unchanged. An early decrease in IgG during combination therapy seems to be an indicator of an amelioration of liver histology.
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Affiliation(s)
- M Leuschner
- Department of Gastroenterology, Johann Wolfgang Goethe University, Frankfurt am Main, Germany
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Affiliation(s)
- T You
- Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, USA
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Leuschner U, Guldutuna S, Bhatti S, Elze A, Imhof M, You T, Zimmer G. TUDCA and UDCA are incorporated into hepatocyte membranes: different sites, but similar effects. Ital J Gastroenterol 1995; 27:376-7. [PMID: 8563010] [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] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The aim of this paper is to point out that: 1) CDCA and DCA increase the polarity of cell membranes and cause the release of cholesterol and phospholipid from the membranes; 2) the extent of this damage is inversely correlated with the cholesterol content of the membrane investigated; 3) UDCA, TUDCA and GUDCA decrease membrane polarity; 4) they prevent membrane damage when added prior to CDCA or DCA; 5) UDCA appears to be incorporated into the apolar domain of the membrane, TUDCA, GUDCA into the interface; 6) UDCA decreases HLA class I expression on hepatocyte membranes; 7) CDCA induces GLDH-release from liver mitochondria and increases mitochondrial membrane polarity and mobility; and 8) UDCA reduces the release of GLDH from mitochondria caused by CDCA.
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Affiliation(s)
- U Leuschner
- Department of Gastroenterology, Johann Wolfgang Goethe Universität, Frankfurt am Main, Germany
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Trojanowski JQ, Mantione JR, Lee JH, Seid DP, You T, Inge LJ, Lee VM. Neurons derived from a human teratocarcinoma cell line establish molecular and structural polarity following transplantation into the rodent brain. Exp Neurol 1993; 122:283-94. [PMID: 8405265 DOI: 10.1006/exnr.1993.1128] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.2] [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: 01/30/2023]
Abstract
Studies of neurons grafted into the brains of experimental animals have been limited by the lack of suitably homogeneous populations of neurons for transplantation. Here we describe the transplantation and survival of pure, postmitotic human neurons (NT2N cells) into the rat brain. NT2N cells were derived from a human teratocarcinoma line (NTera2/clone D1 or NT2 cells) in vitro by retinoic acid treatment. Approximately 5-10 x 10(4) NT2N cells (including previously frozen aliquots of NT2N cells) were injected into the neocortex, subjacent white matter, or hippocampus of adult (N = 51) or neonatal (N = 17) Sprague-Dawley rats. Cyclosporine (7-10 mg/kg) was administered daily to 13 adult rats for up to 12 weeks post-transplant prior to sacrifice. Untreated rats survived for up to 21 weeks post-transplant. Injection sites were serially sectioned and NT2N grafts were analyzed immunohistochemically using antibodies to diverse neuronal and glial proteins to assess the lineage of the grafted cells and their ability to establish molecular and structural polarity. NT2N cells transplanted into untreated adult and neonatal rat brains were committed exclusively to the neuronal phenotype and survived for as long as 8 weeks, although most were rejected after 4 weeks. However, cyclosporine prolonged survival of the NT2N grafts for up to 12 weeks. Further, grafted NT2N cells exhibited an asymmetric geometry (with long axons and simplified dendrites), as well as molecular polarity (with highly phosphorylated neurofilament proteins segregated in axons and microtubule associated protein 2 confined to perikarya and dendrites) by 4 weeks post-transplant. However, the grafted neurons did not become fully mature as evidenced by their failure to express the most highly phosphorylated heavy neurofilament proteins. Finally, previously frozen NT2N cells survived in the rat brain, and none of the grafts formed neoplasms. We conclude from these studies that transplanted NT2N cells represent a highly advantageous model system for studies of the developmental biology of neurons.
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Affiliation(s)
- J Q Trojanowski
- Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104
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Abstract
BACKGROUND Ursodeoxycholate, used for therapy in biliary liver diseases, prevents bile salt damage in animal experiments. Using isolated red blood cell and both canalicular and basolateral hepatocyte membranes, the present study examined this protective effect. METHODS Membranes were incubated with chenodeoxycholate, with chenodeoxycholate and ursodeoxycholate simultaneously, and first with ursodeoxycholate followed by chenodeoxycholate. Changes in membrane structure were investigated by electron paramagnetic resonance spectroscopy, using different spin labels. Data were confirmed by analysis of membrane lipids and studies with 14C-labeled bile acids. RESULTS The increase of polarity in the apolar domain of the membrane caused by chenodeoxycholate corresponded to the amount of solubilized lipids. After preincubation with ursodeoxycholate or its conjugates, membrane damage by subsequent chenodeoxycholate incubation was prevented. This effect was caused by binding of ursodeoxycholate in the apolar domain, of its conjugates in the interface of the membrane. CONCLUSIONS Chenodeoxycholate solubilizes membrane lipids and permits water to permeate into plasma membranes. The steroid nucleus of ursodeoxycholate is bound to the apolar domain and that of the conjugates to the interface of the membrane, thus stabilizing membrane structure.
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Affiliation(s)
- S Güldütuna
- Department of Gastroenterology, University Frankfurt am Main, Germany
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Güldütuna S, You T, Kurts W, Leuschner U. High performance liquid chromatographic determination of free and conjugated bile acids in serum, liver biopsies, bile, gastric juice and feces by fluorescence labeling. Clin Chim Acta 1993; 214:195-207. [PMID: 8472385 DOI: 10.1016/0009-8981(93)90111-g] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Separation and measurement of commonly occurring free and conjugated bile acids in serum, liver biopsies, bile, gastric juice and feces have been successfully accomplished using high performance liquid chromatography with fluorescence labeling. Free and conjugated bile acids were extracted from pretreated samples using Sep-Pak C18 cartridges and then fractionated on a piperidinohydroxypropyl Sephadex LH-20 column. Free and glycine conjugated bile acids were labelled with 4-bromomethyl-7-methoxycoumarin. Taurine conjugated bile acids were hydrolysed with cholylglycine hydrolase prior to derivatization with 4-bromomethyl-7-methoxycoumarin. Labelled bile acids were eluted using an acetonitrile/methanol/water gradient on an ultrasphere ODS column. The eluate was monitored by a fluorophotometer at 360 nm (excitation) and 410 nm (emission). Linearity was obtained between 50 and 400 nmol. Recoveries from serum, gastric juice and feces were greater than 87%. This is therefore a sensitive method for the precise quantification of bile acids in serum, liver biopsies, bile, gastric juice and feces.
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Affiliation(s)
- S Güldütuna
- Department of Gastroenterology, Johann Wolfgang Goethe University, Frankfurt/Main Germany
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