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Wang K, Wang C, Fu B, Huang J, Wei F, Leng X, Feng X, Li Z, Jiang W. Divergent driving mechanisms of community temporal stability in China's drylands. Environ Sci Ecotechnol 2024; 20:100404. [PMID: 38585198 PMCID: PMC10997951 DOI: 10.1016/j.ese.2024.100404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 02/18/2024] [Accepted: 02/19/2024] [Indexed: 04/09/2024]
Abstract
Climate change and anthropogenic activities are reshaping dryland ecosystems globally at an unprecedented pace, jeopardizing their stability. The stability of these ecosystems is crucial for maintaining ecological balance and supporting local communities. Yet, the mechanisms governing their stability are poorly understood, largely due to the scarcity of comprehensive field data. Here we show the patterns of community temporal stability and its determinants across an aridity spectrum by integrating a transect survey across China's drylands with remote sensing. Our results revealed a U-shaped relationship between community temporal stability and aridity, with a pivotal shift occurring around an aridity level of 0.88. In less arid areas (aridity level below 0.88), enhanced precipitation and biodiversity were associated with increased community productivity and stability. Conversely, in more arid zones (aridity level above 0.88), elevated soil organic carbon and biodiversity were linked to greater fluctuations in community productivity and reduced stability. Our study identifies a critical aridity threshold that precipitates significant changes in community stability in China's drylands, underscoring the importance of distinct mechanisms driving ecosystem stability in varying aridity contexts. These insights are pivotal for developing informed ecosystem management and policy strategies tailored to the unique challenges of dryland conservation.
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Affiliation(s)
- Kai Wang
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Cong Wang
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- Shaanxi Yan'an Forest Ecosystem National Observation and Research Station, Beijing, 100085, China
- National Observation and Research Station of Earth Critical Zone on the Loess Plateau in Shaanxi, Xi'an, 710061, China
| | - Bojie Fu
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
- Shaanxi Yan'an Forest Ecosystem National Observation and Research Station, Beijing, 100085, China
- National Observation and Research Station of Earth Critical Zone on the Loess Plateau in Shaanxi, Xi'an, 710061, China
| | - Jianbei Huang
- Max Planck Institute for Biogeochemistry, Hans-Knöll-Str. 10, 07745, Jena, Germany
| | - Fangli Wei
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Xuejing Leng
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiaoming Feng
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zongshan Li
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
- Shaanxi Yan'an Forest Ecosystem National Observation and Research Station, Beijing, 100085, China
- National Observation and Research Station of Earth Critical Zone on the Loess Plateau in Shaanxi, Xi'an, 710061, China
| | - Wei Jiang
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
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Zhang Y, Feng X, Zhou C, Zhao R, Leng X, Wang Y, Sun C. The feedback of greening on local hydrothermal conditions in Northern China. Sci Total Environ 2024; 915:170006. [PMID: 38220007 DOI: 10.1016/j.scitotenv.2024.170006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 12/27/2023] [Accepted: 01/06/2024] [Indexed: 01/16/2024]
Abstract
Northern China has experienced a significant increase in vegetation cover over the past few decades. It lacks a comprehensive understanding of how greening impacts local hydrothermal conditions. To address this issue, in our study, the RegCM-CLM45 model was used to conduct a thorough assessment of the impacts of greening on temperature, vapor pressure deficit (VPD), precipitation, and soil moisture. The findings revealed that the local climatic effects of greening varied across different drought gradients based on the aridity index (AI). In drier regions with AI<0.3, the increased energy induced by greening tended to dissipate as sensible heat, exacerbating both warming and drought conditions. Conversely, in wetter regions with AI>0.3, a greater proportion of energy was lost through evapotranspiration, attenuating warming. Additionally, greening enhanced precipitation and soil moisture in drier regions and moderated their decline in wetter regions. Significantly, our research emphasized the effectiveness of grassland expansion and conservation as prime strategies for ecological restoration, particularly in drylands, where they could effectively alleviate soil drought. Given the diverse responses of different land cover transformations to local hydrothermal conditions in drylands, there is an urgent need to address potential adverse effects arising from inappropriate ecological restoration strategies and to develop an optimal restoration framework for the future.
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Affiliation(s)
- Yu Zhang
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaoming Feng
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Chaowei Zhou
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ruibo Zhao
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xuejing Leng
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yunqiang Wang
- SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
| | - Chuanlian Sun
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
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Leng X, Feng X, Feng Y, Sun C, Liu X, Zhang Y, Zhou C, Wang Y, Fu B. Imbalance in lake variability but not embodying driving factors on the Qinghai-Tibetan Plateau calls on heterogeneous lake management. J Environ Manage 2024; 351:119887. [PMID: 38169255 DOI: 10.1016/j.jenvman.2023.119887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 12/18/2023] [Accepted: 12/18/2023] [Indexed: 01/05/2024]
Abstract
Comprehensive regional remote analysis tends to neglect lakes in exorheic basins on the Qinghai-Tibetan Plateau (QTP), and a concurrent lack of discussions on whether there exist imbalanced explanations for the driving forces of both internal and external lakes is also present. We integrate multisourced lake datasets, high-resolution information, and available altimetry datasets to establish multiple mathematical models to meta-simulate lake volume changes, extend current lake variation datasets, and quantify the imbalance of variations and factors driving the water mass budget. The results showed that the primary cause of lake variations in QTP is net precipitation (57.75 ± 31.46%), followed by glacier runoff (33.53 ± 31.42%), and permafrost (8.34 ± 7.87%). Even though glacier runoff is currently considered as a weak factor of lake variation, heterogeneous results call for remaining attention in glacier-induced lake basins. Imbalance embodying in lake variability but not in contributions of driving factors, which calls for special lake management ways in different watersheds.
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Affiliation(s)
- Xuejing Leng
- State Key Laboratory of Uran and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 00049, China
| | - Xiaoming Feng
- State Key Laboratory of Uran and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
| | - Yu Feng
- School of Land Science and Technology, China University of Geosciences, Beijing, 100083, China
| | - Chuanlian Sun
- State Key Laboratory of Uran and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 00049, China
| | - Xiaochi Liu
- School of Land Science and Technology, China University of Geosciences, Beijing, 100083, China
| | - Yu Zhang
- State Key Laboratory of Uran and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 00049, China
| | - Chaowei Zhou
- State Key Laboratory of Uran and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 00049, China
| | - Yunqiang Wang
- SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075, China
| | - Bojie Fu
- State Key Laboratory of Uran and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
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Leng X, Feng X, Fu B, Shi Q, Ye H, Zhang Y. 'Asian water towers' are not a sustainable solution to the downstream water crisis. Sci Total Environ 2023; 856:159237. [PMID: 36208743 DOI: 10.1016/j.scitotenv.2022.159237] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 09/28/2022] [Accepted: 09/30/2022] [Indexed: 06/16/2023]
Abstract
Quantifying climate change- and socioeconomic development-induced changes in the 'water tower' function is a major challenge in high-mountain Asia (HMA), especially when considering the affected downstream areas. This study applies historical monsoon-influenced rainfall patterns and the water stress index to quantify the climate change- and socioeconomic growth-induced changes in the 'Asian water tower' function through the middle of the 21st century by nonparametric empirical quantile mapping and empirical orthogonal function analysis. Water pressures are predicted to intensify in 25.84 ± 7.87 % of 'water tower' downstream watersheds. Enhancements in the 'Asian water tower' function are vulnerable to help stop the deterioration of downstream water pressure while increasing the water sufficiency probability by 7.97 ± 15.52 %. Water withdrawals are projected to explain 55.90 ± 21.77 % of water security in the 'water tower' function-affected watersheds in 2050; thus, this study calls for more effective policies and the development of technologies to reduce the water crisis in downstream HMA.
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Affiliation(s)
- Xuejing Leng
- State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; Institute of Geomatics, Department of Civil Engineering, 3S Centre, Tsinghua University, Beijing 100084, China
| | - Xiaoming Feng
- State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; Institute of Geomatics, Department of Civil Engineering, 3S Centre, Tsinghua University, Beijing 100084, China.
| | - Bojie Fu
- State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; Institute of Geomatics, Department of Civil Engineering, 3S Centre, Tsinghua University, Beijing 100084, China
| | - Qidong Shi
- State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; Institute of Geomatics, Department of Civil Engineering, 3S Centre, Tsinghua University, Beijing 100084, China
| | - Haipeng Ye
- State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; Institute of Geomatics, Department of Civil Engineering, 3S Centre, Tsinghua University, Beijing 100084, China
| | - Yu Zhang
- State Key Laboratory of Urban and Regional Ecology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, and Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China; Institute of Geomatics, Department of Civil Engineering, 3S Centre, Tsinghua University, Beijing 100084, China
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Leng X, Leszczynski P, Jeka S, Liu S, Liu H, Miakisz M, Gu J, Kilasonia L, Stanislavchuk M, Yang X, Zhou Y, Dong Q, Mitroiu M, Addison J, Zeng X. POS0287 A PHASE III, RANDOMISED, DOUBLE-BLIND, ACTIVE-CONTROLLED CLINICAL TRIAL TO COMPARE BAT1806/BIIB800, A PROPOSED TOCILIZUMAB BIOSIMILAR, WITH TOCILIZUMAB REFERENCE PRODUCT IN SUBJECTS WITH MODERATE TO SEVERE RHEUMATOID ARTHRITIS WITH AN INADEQUATE RESPONSE TO METHOTREXATE THERAPY. Ann Rheum Dis 2022. [DOI: 10.1136/annrheumdis-2022-eular.515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BackgroundBAT1806/BIIB800 is a proposed biosimilar to reference tocilizumab (TCZ). A Phase III randomised, double-blind, active-controlled clinical trial was conducted as part of a biosimilar development programme.ObjectivesTo evaluate the efficacy, pharmacokinetics (PK), safety and immunogenicity of BAT1806/BIIB800 in comparison with EU-sourced TCZ in subjects with moderate to severe rheumatoid arthritis with inadequate response to methotrexate (MTX).MethodsThe study was conducted at 55 centres in China and Europe, between June 2018 and January 2021. Eligible subjects were randomised in a 2:1:1 ratio to one of three treatment groups: (1) BAT1806/BIIB800 up to Week 48, (2) TCZ up to Week 48, or (3) TCZ up to Week 24, followed by BAT1806/BIIB800 from Week 24 to Week 48, administered intravenously every 4 weeks at a dose of 8mg/kg. The primary endpoint was the proportion of subjects achieving an ACR20 response at timepoints pre-specified to meet the requirements of different Regulatory Agencies: Week 12, for EMA; Week 24, for FDA and NMPA. Equivalence margins applied to differences in ACR20 response rates in the BAT1806/BIIB800 and TCZ treatment groups were pre-specified as follows: +/- 14.5% for EMA (95% confidence interval (CI)); -12.0%,15% for FDA (90% CI); +/- 13.6% for NMPA (95% CI). Secondary endpoints included pharmacokinetics, safety and immunogenicity.The ICH E9(R1) estimands framework including intercurrent events (related or unrelated to the COVID19 pandemic) was implemented for the ACR20 evaluation. A logistic regression model including ‘region’ (China and Eastern Europe) and ‘previous biologic or targeted synthetic DMARD use’ (Yes/No) as captured in Interactive Web Response System as stratification factors was utilised to assess equivalence for the primary endpoint. The difference in response rates was estimated and corresponding confidence intervals were derived to assess equivalence for the primary endpoint. This abstract presents results up to Week 24.ResultsIn total, 621 subjects were randomised to receive BAT1806/BIIB800 (N=312), TCZ (N=155), or TCZ followed by BAT1806/BIIB800 (N=154). The groups were comparable in terms of baseline demographics and disease characteristics, including age, gender, disease activity and disease duration. The estimated proportions of subjects achieving an ACR20 response in the BAT1806/BIIB800 vs. the TCZ groups, respectively, were 68.97% vs. 64.82% at Week 12 and 69.89% vs. 67.94% at Week 24. The estimated difference between ACR response rates was 4.15% (95% CI -3.63, 11.93) at week 12, and 1.94% (90% CI -4.04, 7.92; 95% CI -5.18, 9.07) at Week 24. The CIs for the estimated differences between the treatment groups were within the pre-defined equivalence margins (Figure 1). The treatment groups were comparable in terms of serum trough levels, incidence of TEAEs and ADA/NAb positivity (Table 1).Table 1.Safety and Immunogenicity up to Week 24, and Pharmacokinetics at Week 24TCZ (N =309) n (%)BAT1806/BIIB800 (N=312) n (%)TEAE196 (63.4)201 (64.4)Related TEAE151 (48.9)148 (47.4)Serious TEAE13 (4.2)11 (3.5)Related Serious TEAE7 (2.3)2 (0.6)Fatal TEAE1 (0.3)3 (1.0)ADA positive a42 (13.6%)64 (20.5%)NAb positive a42 (13.6%)63 (20.2%)PK, n271276Serum trough level (ug/mL), mean (SD)15.4 (17.1)15.8 (12.3)Serum trough level (ug/mL), geometric mean (CV%)12.3 (140.3)12.9 (121.3)Below limit of quantification, n (%)43 (15.9)28 (10.1)TEAE, treatment emergent adverse eventsa subjects with ≥1 ADA/NAb positive results up to week 24ConclusionBAT1806/BIIB800 has demonstrated equivalent efficacy at Week 12 and Week 24 and a similar PK, safety and immunogenicity profile as reference tocilizumab up to Week 24.Disclosure of InterestsXiaomei Leng: None declared, Piotr Leszczynski: None declared, Sławomir Jeka: None declared, Shengyun Liu: None declared, Huaxiang Liu: None declared, Malgorzata Miakisz: None declared, Jieruo Gu: None declared, Lali Kilasonia Speakers bureau: Sandoz, Amgen, Takeda, Mykola Stanislavchuk Speakers bureau: Pfizer, Orion, Boehringer Ingelheim, Xiaolei Yang Shareholder of: Employee of the Bio-thera Solutions Ltd. with shares as a part of Stock incentive plan., Employee of: Employee of the Bio-thera Solutions Ltd., Yinbo Zhou Shareholder of: Employee of Bio-thera Solutions Ltd. with share as part of Stock incentive plan, Employee of: Employee of Bio-thera Solutions Ltd., Qingfeng Dong Shareholder of: Employee of Bio-thera Solutions Ltd. with shares as part of Stock incentive plan, Employee of: Employee of Bio-thera Solutions Ltd., Marian Mitroiu Shareholder of: Employee of Biogen and may hold stocks, Employee of: Employee of Biogen, Janet Addison Shareholder of: Employee of Biogen and holds stock in Biogen, Employee of: Employee of Biogen, Xiaofeng Zeng: None declared
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Wang FJ, Leng X, Gao D, Shen XY, Wang WP, Liu HM, Liu PF. [Application of traction metal clip with fishhook-like device in endoscopic resection]. Zhonghua Yi Xue Za Zhi 2021; 101:3660-3663. [PMID: 34823284 DOI: 10.3760/cma.j.cn112137-20210425-00986] [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
From July 2020 to June 2021, patients in Jiangyin Hospital Affiliated to Nantong University who met the enrollment criteria were treated with the fishhook-like device during the operation to suture the postoperative wound (group A). Patients with similar conditions and similar size wounds who were treated with a "purse-string suture" to suture the wounds were retrospectively analyzed as the control group (group B). Difference in the suture rate, adverse events, time required for suturing, and number of metal clips were compared between the two groups. The time required for suturing was (7.83±2.41) min in group A and (11.00±3.31) min in group B. The difference was statistically significant (P=0.002). The number of metal clamps used in group A averaged 7.17 pieces/case, and the number of metal clamps used in group B averaged 7.06 pieces/case. The difference was not statistically significant (P>0.05).The traction metal clip with the fishhook-like device is ingeniously designed and easy to operate. It has a good suture effect on the wound after endoscopic resection and effectively prevents postoperative adverse events.
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Affiliation(s)
- F J Wang
- Department of Gastroenterology, Jiangyin Hospital Affiliated to Nantong University, Jiangyin 214400, China
| | - X Leng
- Department of Gastroenterology, Jiangyin Hospital Affiliated to Nantong University, Jiangyin 214400, China
| | - D Gao
- Department of Gastroenterology, Jiangyin Hospital Affiliated to Nantong University, Jiangyin 214400, China
| | - X Y Shen
- Department of Gastroenterology, Jiangyin Hospital Affiliated to Nantong University, Jiangyin 214400, China
| | - W P Wang
- Department of Gastroenterology, Jiangyin Hospital Affiliated to Nantong University, Jiangyin 214400, China
| | - H M Liu
- Department of Gastroenterology, Jiangyin Hospital Affiliated to Nantong University, Jiangyin 214400, China
| | - P F Liu
- Department of Gastroenterology, Jiangyin Hospital Affiliated to Nantong University, Jiangyin 214400, China
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You H, Li M, Zhao JL, Wu L, Duan X, Luo H, Zhao C, Zhan F, Wu Z, Li H, Yang M, Xu J, Wei W, Wang Y, Shi J, Qu J, Wang Q, Leng X, Tian X, Zhao Y, Zeng X. POS0754 DEVELOPMENT OF A RISK PREDICTION MODEL FOR VENOUS THROMBOEMBOLISM IN PATIENTS WITH SYSTEMIC LUPUS ERYTHEMATOSUS: THE SLE-VTE SCORE. Ann Rheum Dis 2021. [DOI: 10.1136/annrheumdis-2021-eular.2769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background:Patients with systemic lupus erythematosus (SLE) have a substantially increased risk of venous thromboembolism (VTE). An individual VTE risk assessment is important to ensure that all patients are assessed and given adequate thromboprophylaxis.Objectives:We conducted this study to develop a risk score for VTE in patients with SLE.Methods:Patients with SLE who participated in the Chinese SLE Treatment and Research group were enrolled in this study. Patient baseline information and clinical laboratory indicators were obtained, and VTE events were recorded every 3-6 months during follow-up visits. The risk prediction model was created and internally validated using the bootstrap methods, and a scoring system was established (Figure 1).Figure 1.Flow chart of study design.Results:Out of 4,502 patients included in this study, 135 had a VTE event. After univariate analysis and Lasso regression, the following 11 variables were identified and included in the risk prediction model: male sex, age, BMI ≥25 kg/m2, hyperlipidemia, hypoalbuminemia, hsCRP>3 mg/L, renal involvement, nervous system involvement, anti-β2-glycoprotein I antibody positivity, lupus anticoagulant positivity, and no use of hydroxychloroquine. The AUC for the SLE-VTE score (Table 1) was 0.947 (95% CI, 0.9249-0.9694). The SLE-VTE score’s sensitivity and specificity with the optimal cutoff value of 13 were 0.919 and 0.881, respectively. The SLE-VTE score was superior to the GAPSS system in predicting the risk of VTE in patients with SLE (AUC= 0.947 vs. 0.680, P< 0.001; integrated discrimination improvement (IDI)= 0.6652, P< 0.001; net reclassification improvement (NRI)= 0.6652, P< 0.001).Table 1.Final multivariable analysis for venous thromboembolism risk in patients with SLE β coefficientsOdds ratio* (95% CI)P-valuePoints in scoring systemMale0.6211.86(0.953-3.503)0.0612Age at study entry(≥50)0.8372.308(1.339-3.915)0.0023BMI02(kg/m20.7922.209(1.333-3.627)0.0023Hyperlipemia0.8382.313(1.246-4.166)0.0063Hypoalbuminemia2.1638.697(5.185-14.794)< 0.0017hsCRP>3 mg/L1.4524.272(2.618-6.968)< 0.0015Anti β2GPI1.0132.754(1.543-4.853)0.0013LA1.5594.752(2.799-8.072)< 0.0015Nervous system2.38210.832(6.163-18.998)< 0.0018Lupus nephritis0.8352.305(1.414-3.756)0.0013No use of hydroxychloroquine1.7715.876(3.722-9.401)< 0.0016BMI: body mass index; hsCRP: Hypersensitive c-reactive protein; ACL: anticardiolipin, antiβ2GPI: anti-β2-glycoprotein I, LA: lupus anticoagulantm;Values in bold are statistically significant at p <0.05.Conclusion:Various factors are related to the occurrence of VTE in patients with SLE. The proposed SLE-VTE risk score can accurately predict the risk of VTE and help identify SLE patients with a high risk of VTE who may benefit from thromboprophylaxis.References:[1]Ramirez GA, Efthymiou M, Isenberg DA, Cohen H. Under crossfire: thromboembolic risk in systemic lupus erythematosus. Rheumatology. 2018;58:940-952.[2]Chung WS, Lin CL, Chang SN, Lu CC, Kao CH. Systemic lupus erythematosus increases the risks of deep vein thrombosis and pulmonary embolism: a nationwide cohort study. J Thromb Haemost. 2014;12:452-458.[3]Liew NC, Alemany GV, Angchaisuksiri P, et al. Asian venous thromboembolism guidelines: updated recommendations for the prevention of venous thromboembolism. Int Angiol. 2017;36:1.[4]Savino S, Giovanni S, Veronica M, Dario R, Khamashta MA, Laura BM. GAPSS: the Global Anti-Phospholipid Syndrome Score. Rheumatology. 2013:8.[5]Konstantinides SV, Meyer G, Becattini C, et al. 2019 ESC Guidelines for the diagnosis and management of acute pulmonary embolism developed in collaboration with the European Respiratory Society (ERS). Eur Heart J. 2020;41:543-603.[6]Moghadamyeghaneh Z, Hanna MH, Carmichael JC, Nguyen NT, Stamos MJ. A Nationwide Analysis of Postoperative Deep Vein Thrombosis and Pulmonary Embolism in Colon and Rectal Surgery. J Gastrointest Surg. 2014;18:2169-2177.Disclosure of Interests:None declared
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Wong KS, Chen XY, Leung TWH, Siu YW, Xiong L, Leng X. Intracranial artery calcification to screen patients at high risk of recurrent stroke: abridged secondary publication. Hong Kong Med J 2020; 26 Suppl 7:42-44. [PMID: 33229619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023] Open
Affiliation(s)
- K S Wong
- Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong
| | - X Y Chen
- Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong
| | - T W H Leung
- Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong
| | - Y W Siu
- Department of Diagnostic and Interventional Radiology, Kwong Wah Hospital
| | - L Xiong
- Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong
| | - X Leng
- Department of Medicine and Therapeutics, Prince of Wales Hospital, The Chinese University of Hong Kong
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Leng X, Feng X, Fu B. Driving forces of agricultural expansion and land degradation indicated by Vegetation Continuous Fields (VCF) data in drylands from 2000 to 2015. Glob Ecol Conserv 2020. [DOI: 10.1016/j.gecco.2020.e01087] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Zeng X, Leng X, Wei K, Tang WM, Tang CH, Tunceli K, Aggarwal J, Ramey D, Lozano F, Doshi I, Macahilig C, Odak S, Johnson K. FRI0428 RESULTS FROM A CROSS-SECTIONAL, OBSERVATIONAL STUDY TO ASSESS INADEQUATE PAIN RELIEF IN PATIENTS WITH KNEE AND/OR HIP OSTEOARTHRITIS IN CHINA. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.5813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background:Osteoarthritis (OA) of the knee and hip is a leading cause of disability worldwide, particularly due to the primary symptom of pain in the weight-bearing joints. There is limited data that characterizes patients who experience moderate to severe pain despite analgesic treatment in China.Objectives:This study estimates the real-world prevalence of inadequate pain relief (IPR) among patients with knee and/or hip OA who have been prescribed analgesic therapy and characterizes this patient population. The study was conducted in China, the Philippines, Thailand, Russia, and Mexico. This abstract presents results from China.Methods:This is a multinational, multi-site, cross-sectional, observational study. Physicians managing patients with OA were recruited and asked to enroll patients over 50 years of age with knee and/or hip OA who had been prescribed topical and/or oral pain medication for at least 30 days prior to study visit. Patients completed a one-time assessment of pain, function, and health-related quality of life (HRQOL) using patient reported outcome (PRO) instruments. Physicians abstracted data from patient charts. IPR was defined as an average pain score of >4/10 on Brief Pain Inventory Question #5 (average pain). Statistical tests including chi-square for categorical variables and Mann-Whitney Wilcoxon test for continuous variables were conducted to assess differences in demographic and clinical characteristics as well as PROs between patients with and without IPR. A multivariate regression analysis was conducted to assess the relationship between IPR and PROs.Results:571 patients treated at 10 hospital centers in China were enrolled. 73% were female, the mean (SD) age was 62 (8.32) years. The number of years with OA ranged from less than one year to over 37 years, suggesting a broad sample of patients. Most patients were impacted by knee OA only (90%). Almost half (43%) of the study population met the definition of IPR. Patients with IPR tended to be older, have greater prevalence of obesity, have more comorbidities, and had longer disease duration. The majority (98%) of patients were receiving nonsteroidal anti-inflammatory drugs (NSAIDS), followed by chondroprotective medications (23%). However, more patients with IPR mentioned being dissatisfied with treatment (38% vs. 21%). After adjusting for covariates, patients with IPR reported worse HRQOL, more functional limitations, and reduced work productivity compared to patients without IPR.Conclusion:IPR is highly prevalent among individuals with knee and/or hip OA in China and is associated with decreased HRQOL and work productivity, impaired function, and treatment dissatisfaction. Developing awareness among healthcare professionals about the presence and potential impact of IPR is important for the ultimate improvement of OA patient management.PROmean (SE)No IPR(N=328)IPR(N=243)EQ-5D Index0.72 (0.01)0.49 (0.02)EQ-5D VAS72.3 (0.85)65.5 (1.00)WOMAC Pain Subscale13.1 (0.78)22.7 (1.52)WOMAC Stiffness Subscale4.2 (0.27)7.4(0.51)WOMAC Physical Function Subscale44.8 (2.61)76.9 (5.07)Work Productivity Loss30.0 (4.07)47.5 (10.46)Multivariate analysis adjusted for age, year since OA diagnosis/follow-up, gender, BMI, number of medication classes, insurance, physician specialty/academic responsibilities, number of affected joints, diabetes, CVD, hyperlipidemia/hypertension, and depression. All differences were statistically significant (p < 0.05) except work productivity loss (p=0.11)Disclosure of Interests:Xiaofeng Zeng Consultant of: MSD Pharmaceuticals, Xiaomei Leng Consultant of: MSD Pharmaceuticals, Knightley Wei Employee of: Employed by MSD Pharmaceuticals (China), Wen Min Tang Employee of: Employed by MSD Pharmaceuticals (China), Cai Hua Tang Employee of: Employed by MSD Pharmaceuticals (China), Kaan Tunceli Shareholder of: Holds company stock at Merck Sharp & Dohme Corp., Employee of: Employed by Merck Sharp & Dohme Corp., Jyoti Aggarwal Consultant of: Merck & Co., Inc., Dena Ramey Shareholder of: Holds company stock at Merck Sharp & Dohme Corp., Employee of: Employed by Merck Sharp & Dohme Corp., Fidel Lozano Employee of: Merck & Co. salaried employee, Ishita Doshi Shareholder of: Holds company stock at Merck Sharp & Dohme Corp., Employee of: Employed by Merck Sharp & Dohme Corp., Cynthia Macahilig Consultant of: Consultant to Merck Sharp & Dohme Corp., Shardul Odak Consultant of: Consultant to Merck Sharp & Dohme Corp., Kelly Johnson Employee of: Employed by Merck & Co., Inc.
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Wang F, Leng X, Gao Y, Zhao K, Sun Y, Bian H, Liu H, Liu P. Endoscopic submucosal dissection of distal intestinal tumors using grasping forceps for traction. Tech Coloproctol 2019; 23:1079-1083. [PMID: 31659559 DOI: 10.1007/s10151-019-02102-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Accepted: 10/15/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND The aim of this study was to assess the efficacy of traction device-assisted endoscopic submucosal dissection (ESD) of the rectum and the distal segment of sigmoid colon using grasping forceps. METHODS A total of 43 patients scheduled for colonic ESD at our institution were enrolled between January 2013 and June 2017. The patients were randomly allocated to receive conventional ESD (group A) or traction device-assisted ESD (group B). The procedure time, complication rate, and en-block resection rate in the two groups were compared. RESULTS A total of 41 patients completed the study. The procedure time, complication rate and en-block resection rate were, respectively, 104.1 ± 34.7 min, 15%, 90% in the routine group (group A) and 84.7 ± 23.5 min, 9.5%, 90.5% in traction device-assisted ESD (group B). The procedure time in group B was significantly less than that in group A (F = 4.442, p < 0.05). CONCLUSIONS Traction device-assisted ESD using grasping forceps is safe and effective in distal colon ESD.
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Affiliation(s)
- F Wang
- Xuzhou Medical University, No. 3 Yingrui Road, Jiangyin, China
| | - X Leng
- Xuzhou Medical University, No. 3 Yingrui Road, Jiangyin, China
| | - Y Gao
- Xuzhou Medical University, No. 3 Yingrui Road, Jiangyin, China
| | - K Zhao
- Xuzhou Medical University, No. 3 Yingrui Road, Jiangyin, China
| | - Y Sun
- Xuzhou Medical University, No. 3 Yingrui Road, Jiangyin, China
| | - H Bian
- Xuzhou Medical University, No. 3 Yingrui Road, Jiangyin, China
| | - H Liu
- Xuzhou Medical University, No. 3 Yingrui Road, Jiangyin, China
| | - P Liu
- Xuzhou Medical University, No. 3 Yingrui Road, Jiangyin, China.
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Liu W, Xie Y, Ping L, Jiang M, Zhang G, Cui Y, Xu J, Wu M, Leng X, Wang X, Wang S, Zhang G, Zhu J, Song Y. Safety and pharmacokinetics of novel CXCR4 antagonist YF-H-2015005 in the mobilization of hematopoietic stem cells in patients with non-Hodgkin’s lymphoma. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz251.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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13
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Leng X, Jiang H. Effects of arachidonic acid and its major prostaglandin derivatives on bovine myoblast proliferation, differentiation, and fusion. Domest Anim Endocrinol 2019; 67:28-36. [PMID: 30677541 DOI: 10.1016/j.domaniend.2018.12.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Revised: 12/03/2018] [Accepted: 12/13/2018] [Indexed: 12/23/2022]
Abstract
Many studies have shown positive effects of prostaglandins (PGs) on various steps of skeletal muscle formation such as myoblast proliferation and myotube hypertrophy. In animals, PGs are synthesized through the action of the rate-limiting enzymes cyclooxygenase (COX) -1 and COX-2 from arachidonic acid (AA), a conditionally essential fatty acid. As a step toward exploring the possibility of using dietary supplementation of AA to improve skeletal muscle growth in cattle, which are major meat-producing animals, we determined the effects of AA and its major PG derivatives PGE2, PGF2α, and PGI2 on proliferation, differentiation, and fusion of primary bovine myoblasts in vitro. In the proliferation experiment, myoblasts were cultured in a growth medium to which was added 10 μM AA, 1 μM PGE2, 1 μM PGF2α, 1 μM PGI2, or vehicle control for 24 h, and the proliferating cells were identified by 5-ethynyl-2'-deoxyuridine (EdU) labeling. This experiment revealed that AA, PGE2, PGF2α, and PGI2 each increased the number of proliferating cells by 13%, 24%, 16%, and 16%, respectively, compared to the control (n = 7, P < 0.05). In the differentiation and fusion test, myoblasts were induced to differentiate and fuse into myotubes in the presence of the aforementioned treatments for 0, 24, 48, and 72 h. Based on quantitative reverse transcription PCR analyses of mRNAs of myoblast differentiation and fusion markers (myogenin; myosin heavy chain 3; creatine kinase, muscle; myomaker) at 0, 24, and 48 h of differentiation, AA, PGE2, and PGF2α promoted myoblast differentiation (n = 6, P < 0.05). Based on Giemsa staining and counting the number of myotubes at 72 h of differentiation, PGE2 enhanced the number of formed myotubes by 14% (P < 0.05) compared to the control. Treating the myoblasts with AA and either the COX-1 and COX-2 common inhibitor indomethacin or the COX-2-specific inhibitor NS-398 reversed the stimulatory effect of AA on myoblast proliferation (n = 4, P < 0.05). Overall, this study demonstrates that exogenous AA stimulates bovine myoblast proliferation and differentiation in culture. The results of this study suggest that AA stimulates myoblast proliferation through its metabolites PGE2, PGF2α, or PGI2, and that AA stimulates myoblast differentiation through PGE2.
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Affiliation(s)
- X Leng
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA 24061, USA
| | - H Jiang
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA 24061, USA.
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Leng X, Nicklas B, Williamson J, Kritchevsky S. DEPRESSIVE SYMPTOMS ARE RELATED TO PHYSICAL AND COGNITIVE FUNCTION IN OLDER ADULTS ACROSS MULTIPLE CO-MORBIDITIES. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.1894] [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)
- X Leng
- Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, NC
| | - B Nicklas
- Section on Gerontology and Geriatric Medicine, Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC
| | - J Williamson
- Gerontology and Geriatric Medicine, Wake Forest School of Medicine
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Zheng W, Leng X, Vinsky M, Li C, Jiang H. Association of body weight gain with muscle, fat, and liver expression levels of growth hormone receptor, insulin-like growth factor I, and beta-adrenergic receptor mRNAs in steers. Domest Anim Endocrinol 2018; 64:31-37. [PMID: 29730537 DOI: 10.1016/j.domaniend.2018.03.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Revised: 01/26/2018] [Accepted: 03/30/2018] [Indexed: 10/17/2022]
Abstract
The physiological basis of feed efficiency is unclear. Administration of GH or beta-adrenergic agonists improves feed efficiency in various animals. The objective of this study was to test the hypothesis that more efficient cattle have greater expression of GH receptor (GHR) or beta-adrenergic receptor (ADRB) mRNA in skeletal muscle, fat, and liver, the major target tissues of GH and beta-adrenergic agonists. Fifty Angus steers were fed a finishing diet for 75 d to determine residual feed intake (RFI). Carcass measures, skeletal muscle, subcutaneous fat, and liver samples were collected from the top 10 high-RFI steers and top 10 low-RFI steers at slaughter. Abundances of GHR, insulin-like growth factor I (IGF1), IGF1 receptor (IGF1R), beta-1 adrenergic receptor (ADRB1), ADRB2, and ADRB3 mRNAs were quantified by real-time reverse transcription-PCR. Low-RFI steers consumed 11% less dry matter intake than high-RFI steers (P = 0.004). Low- and high-RFI steers, however, did not differ in ADG or other growth or carcass measures. Low-RFI steers had a tendency to have smaller birth weights than high-RFI steers (P = 0.089). The expression levels of GHR, IGF1, IGF1R, ADRB1, ADRB2, and ADRB3 mRNAs in muscle, fat, and liver were neither different (P > 0.1) between high- and low-RFI steers nor correlated (P > 0.1) with RFI. These results do not support our original hypothesis. However, the expression levels of GHR, IGF1, and IGF1R mRNAs in muscle and fat were positively correlated with ADG (r = 0.52 to 0.65, P = 0.002 to 0.02), whereas the expression levels of GHR mRNA (r = -0.50, P = 0.03) and IGF1 mRNA (r = -0.47, P = 0.04) in the liver were negatively correlated with ADG. These results suggest that the GHR, IGF1, and IGF1R mRNA expression levels in the muscle and fat have a positive effect, whereas the GHR and IGF1 mRNA expression levels in the liver have a negative effect on postweaning body weight gain in cattle.
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MESH Headings
- Adipose Tissue/metabolism
- Animals
- Body Composition/physiology
- Cattle
- Gene Expression Regulation/physiology
- Insulin-Like Growth Factor I/genetics
- Insulin-Like Growth Factor I/metabolism
- Liver/metabolism
- Male
- Muscle, Skeletal/metabolism
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Receptors, Adrenergic, beta/genetics
- Receptors, Adrenergic, beta/metabolism
- Receptors, Somatomedin/genetics
- Receptors, Somatomedin/metabolism
- Receptors, Somatotropin/genetics
- Receptors, Somatotropin/metabolism
- Weight Gain/physiology
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Affiliation(s)
- W Zheng
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA, USA; College of Animal Sciences, Nanjing Agricultural University, Nanjing, China
| | - X Leng
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA, USA
| | - M Vinsky
- Agriculture and Agri-Food Canada, Lacombe Research and Development Centre, Lacombe, AB, Canada
| | - C Li
- Agriculture and Agri-Food Canada, Lacombe Research and Development Centre, Lacombe, AB, Canada; Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada.
| | - H Jiang
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA, USA.
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Wang Z, Li M, Wang Y, Xu D, Wang Q, Zhang S, Zhao J, Su J, Wu Q, Shi Q, Leng X, Zhang W, Tian X, Zhao Y, Zeng X. Long-term mortality and morbidity of patients with systemic lupus erythematosus: a single-center cohort study in China. Lupus 2018; 27:864-869. [PMID: 29308727 DOI: 10.1177/0961203317751852] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Z Wang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - M Li
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - Y Wang
- Department of Epidemiology and Bio-statistics, Institute of Basic Medical Sciences, China Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - D Xu
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - Q Wang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - S Zhang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - J Zhao
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - J Su
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - Q Wu
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - Q Shi
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - X Leng
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - W Zhang
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - X Tian
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - Y Zhao
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
| | - X Zeng
- Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
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Leng X, Lan L, Ip HL, Fan F, Ma SH, Ma K, Liu H, Yan Z, Liu J, Abrigo J, Soo YOY, Liebeskind DS, Wong KS, Leung TW. Translesional pressure gradient and leptomeningeal collateral status in symptomatic middle cerebral artery stenosis. Eur J Neurol 2017; 25:404-410. [PMID: 29171118 DOI: 10.1111/ene.13521] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Accepted: 11/20/2017] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND PURPOSE Leptomeningeal collateral (LMC) status governs the prognosis of large artery occlusive stroke, although factors determining LMC status are not fully elucidated. The aim was to investigate metrics affecting LMC status in such patients by using computational fluid dynamics (CFD) models based on computed tomography angiography (CTA). METHODS In this cross-sectional study, patients with recent ischaemic stroke or transient ischaemic attack attributed to atherosclerotic M1 middle cerebral artery (MCA) stenosis (50%-99%) were recruited. Demographic, clinical and imaging data of these patients were collected. Ipsilesional LMC status was graded as good or poor by assessing the laterality of anterior and posterior cerebral arteries in CTA. A CFD model based on CTA was constructed to reflect focal hemodynamics in the distal internal carotid artery, M1 MCA and A1 anterior cerebral artery. Pressure gradients were calculated across culprit MCA stenotic lesions in CFD models. Predictors for good LMC status were sought in univariate and multivariate analyses. RESULTS Amongst the 85 patients enrolled (mean age 61.5 ± 10.9 years), 38 (44.7%) had good ipsilesional LMC status. The mean pressure gradient across MCA lesions was 14.8 ± 18.1 mmHg. Advanced age (P = 0.030) and a larger translesional pressure gradient (P = 0.029) independently predicted good LMCs. A lower fasting blood glucose level also showed a trend for good LMCs (P = 0.058). CONCLUSIONS Our study suggested a correlation between translesional pressure gradient and maturation of LMCs in intracranial atherosclerotic disease. Further studies with more exquisite and dynamic monitoring of cerebral hemodynamics and LMC evolution are needed to verify the current findings.
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Affiliation(s)
- X Leng
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China.,Shenzhen Research Institute, Chinese University of Hong Kong, Shenzhen, China
| | - L Lan
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
| | - H L Ip
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
| | - F Fan
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
| | - S H Ma
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
| | - K Ma
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
| | - H Liu
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China.,Department of Imaging and Interventional Radiology, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
| | - Z Yan
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - J Liu
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - J Abrigo
- Department of Imaging and Interventional Radiology, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
| | - Y O Y Soo
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
| | - D S Liebeskind
- Neurovascular Imaging Research Core, Department of Neurology, University of California, Los Angeles, CA, USA
| | - K S Wong
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
| | - T W Leung
- Division of Neurology, Department of Medicine and Therapeutics, Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, China
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Yang F, Zhang H, Leng X, Hao F, Wang L. miR-146b measurement in FNA to distinguish papillary thyroid cancer from benign thyroid masses. Br J Biomed Sci 2017; 75:43-45. [PMID: 28937915 DOI: 10.1080/09674845.2017.1347336] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- F Yang
- Department of Ultrasound, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - H Zhang
- Department of Thyroid Surgery, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - X Leng
- Department of Ultrasound, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - F Hao
- Department of Ultrasound, The Affiliated Hospital of Qingdao University, Qingdao, China
- Department of Pathology, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - L Wang
- Department of Ultrasound, Qilu Hospital of Shandong University, Qingdao, China
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Zheng W, Leng X, Vinsky M, Li C, Jiang H. 202 Residual feed intake is not associated with muscle, fat, or liver expression of growth hormone receptor, insulin-like growth factor i, or beta-adrenergic receptor mRNA in Angus steers. J Anim Sci 2017. [DOI: 10.2527/asasann.2017.202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Leng X, Jiang H. 362 Identification of a beneficial role of proteasome-mediated protein degradation in the differentiation of bovine myoblasts into myotubes. J Anim Sci 2017. [DOI: 10.2527/asasann.2017.362] [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: 11/13/2022] Open
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Song Y, Cen X, Yang H, Wu M, Shen Y, Lei T, Leng X, Ping L, Xie Y, Zhu J. TREATMENT STRATEGIES AND PROGNOSTIC FACTORS OF PRIMARY GASTRIC DIFFUSE LARGE B CELL LYMPHOMA: A RETROSPECTIVE STUDY OF 303 CASES FROM CHINA LYMPHOMA PATIENT REGISTRY. Hematol Oncol 2017. [DOI: 10.1002/hon.2439_137] [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: 11/08/2022]
Affiliation(s)
- Y. Song
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - X. Cen
- Department of Hematology; Peking University First Hospital; Beijing China
| | - H. Yang
- Department of Lymphoma; Zhejiang Cancer Hospital; Hangzhou China
| | - M. Wu
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - Y. Shen
- Department of Hematology; Peking University First Hospital; Beijing China
| | - T. Lei
- Department of Lymphoma; Zhejiang Cancer Hospital; Hangzhou China
| | - X. Leng
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - L. Ping
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - Y. Xie
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - J. Zhu
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
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Song Y, Jia J, Wu M, Leng X, Lin N, Xie Y, Zheng W, Wang X, Ping L, Tu M, Ying Z, Zhang C, Liu W, Deng L, Zhu J. FIRST-LINE L-ASPARAGINASE-BASED CHEMOTHERAPY PLUS RADIOTHERAPY IS ACTIVE IN STAGE I/II EXTRANODAL NK/T-CELL LYMPHOMA: RESULTS FROM PEKING UNIVERSITY CANCER HOSPITAL. Hematol Oncol 2017. [DOI: 10.1002/hon.2437_113] [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: 11/10/2022]
Affiliation(s)
- Y. Song
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - J. Jia
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - M. Wu
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - X. Leng
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - N. Lin
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - Y. Xie
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - W. Zheng
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - X. Wang
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - L. Ping
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - M. Tu
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - Z. Ying
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - C. Zhang
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - W. Liu
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - L. Deng
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
| | - J. Zhu
- Department of Lymphoma; Peking University Cancer Hospital & Institute; Beijing China
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Song Y, Cen X, Wu M, Shen Y, Leng X, Ping L, Xie Y, Zhu J. CLINICAL FEATURES AND PROGNOSES OF PRIMARY GASTRIC DIFFUSE LARGE B CELL LYMPHOMA: A RETROSPECTIVE ANALYSIS OF 139 CHINESE CASES WITH IMMUNOPHENOTYPING FROM CLAP. Hematol Oncol 2017. [DOI: 10.1002/hon.2439_138] [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: 11/08/2022]
Affiliation(s)
- Y. Song
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - X. Cen
- Department of Hematology; Peking University First Hospital; Beijing China
| | - M. Wu
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - Y. Shen
- Department of Hematology; Peking University First Hospital; Beijing China
| | - X. Leng
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - L. Ping
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - Y. Xie
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
| | - J. Zhu
- Department of Lymphoma, Key laboratory of Carcinogenesis and Translational Research (Ministry of Education); Peking University Cancer Hospital & Institute; Beijing China
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Jiang H, Settlage R, Leng X, Hou Y. 0898 Identification of novel genes and mechanisms involved in bovine myogenic differentiation. J Anim Sci 2016. [DOI: 10.2527/jam2016-0898] [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: 11/13/2022] Open
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25
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Leng X, Jiang H. 0879 Effects of arachidonic acid and prostaglandins on proliferation, differentiation, and fusion of bovine myoblasts. J Anim Sci 2016. [DOI: 10.2527/jam2016-0879] [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: 11/13/2022] Open
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Leng X, Bollinger AT, Božović I. Purely electronic mechanism of electrolyte gating of indium tin oxide thin films. Sci Rep 2016; 6:31239. [PMID: 27506371 PMCID: PMC4979031 DOI: 10.1038/srep31239] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 07/15/2016] [Indexed: 11/21/2022] Open
Abstract
Epitaxial indium tin oxide films have been grown on both LaAlO3 and yttria-stabilized zirconia substrates using RF magnetron sputtering. Electrolyte gating causes a large change in the film resistance that occurs immediately after the gate voltage is applied, and shows no hysteresis during the charging/discharging processes. When two devices are patterned next to one another and the first one gated through an electrolyte, the second one shows no changes in conductance, in contrast to what happens in materials (like tungsten oxide) susceptible to ionic electromigration and intercalation. These findings indicate that electrolyte gating in indium tin oxide triggers a pure electronic process (electron depletion or accumulation, depending on the polarity of the gate voltage), with no electrochemical reactions involved. Electron accumulation occurs in a very thin layer near the film surface, which becomes highly conductive. These results contribute to our understanding of the electrolyte gating mechanism in complex oxides and may be relevant for applications of electric double layer transistor devices.
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Affiliation(s)
- X Leng
- Brookhaven National Laboratory, Upton NY 11973, USA
| | | | - I Božović
- Brookhaven National Laboratory, Upton NY 11973, USA.,Applied Physics Department, Yale University, New Haven CT 06520, USA
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Leng X, Lan L, Liu L, Leung TW, Wong KS. Good collateral circulation predicts favorable outcomes in intravenous thrombolysis: a systematic review and meta-analysis. Eur J Neurol 2016; 23:1738-1749. [PMID: 27478977 DOI: 10.1111/ene.13111] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [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: 04/15/2016] [Accepted: 06/27/2016] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND PURPOSE Baseline collateral status has been correlated with outcomes of acute ischaemic stroke patients receiving intravenous thrombolysis (IVT) in previous studies. We carried out the current systematic review and meta-analysis to synthesize currently available evidence regarding such correlations. METHODS Full-text articles published since 2000 were retrieved and screened. The overall effect sizes of good versus poor collateral status over a series of outcomes and certain baseline features were estimated by random-effects models and presented in risk ratios (RRs) or mean differences. RESULTS Overall, 28 (3057 patients) and 14 (1584 patients) studies were included in qualitative and quantitative synthesis, respectively. Compared with poor pre-treatment collateral status, good collaterals showed a beneficial effect over the primary outcome of a favorable functional outcome at 3 or 6 months [RR, 2.45; 95% confidence interval, 1.94-3.09; P < 0.001] in acute ischaemic stroke patients receiving IVT treatment. However, such an effect tended to be different between studies with prescribed time windows of 3, 4.5 and > 4.5 h (up to 7 h), with the RRs being 2.21, 2.48 and 5.00, respectively (I2 = 53%). Good pre-treatment collaterals were also associated with a smaller infarct size at baseline, and a lower rate of symptomatic intracranial hemorrhage and a higher rate of neurological improvement early after IVT treatment. CONCLUSIONS The present study has demonstrated the prognostic value of baseline collateral circulation for outcomes of acute ischaemic stroke patients receiving intravenous reperfusion therapies, studied with different time windows of up to 7 h after ictus for IVT therapy.
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Affiliation(s)
- X Leng
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong
| | - L Lan
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong
| | - L Liu
- Department of Neurology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - T W Leung
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong
| | - K S Wong
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong
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Abstract
The trion model is based on the Mountcastle columnar organizational principle of cortex. A trion represents an idealized minicolumn with three levels of firing activity and is highly structured in time and in spatial connections. A network of trions has a large repertoire of quasi-stable, periodic spatial-temporal firing patterns, MPs, which can be excited and each MP can be readily enhanced by a Hebb learning rule. A particular MP present in most repertoires has all trions firing together in synchrony, which we identify as the 'Epileptic' MP (EMP). In trion model simulations, the EMP can be enhanced via the Hebb rule after electrical stimulation so that an epileptic focus with after discharge (about 3-6 Hz) is formed and spontaneous firing of the EMP occurs (as in kindling). Following this, by using a small array of closely-spaced stimulating electrodes out of phase, other MPs are enhanced via the Hebb rule eliminating the dominance of the EMP. We strongly urge that these predictions be tested in the animal models for possible clinical relevance.
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Affiliation(s)
- X Leng
- Center for the Neurobiology of Learning and Memory, University of California, Irvine 92717
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Huang HY, Song YQ, Zheng W, Wang XP, Xie Y, Lin NJ, Tu MF, Zhang C, Ping LY, Liu WP, Ying ZT, Deng LJ, Ding N, Wu M, Sun YL, Du TT, Leng X, Zhu J. [Clinical analysis of thalidomide in 36 untreated patients with T-cell lymphoma]. Zhonghua Xue Ye Xue Za Zhi 2016; 37:529-31. [PMID: 27431083 PMCID: PMC7348338 DOI: 10.3760/cma.j.issn.0253-2727.2016.06.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Stefanick ML, Brunner RL, Leng X, Limacher MC, Bird CE, Garcia DO, Hogan PE, LaMonte MJ, Mackey RH, Johnson KC, LaCroix A, Robinson JG, Seguin RA, Tindle HA, Wassertheil-Smoller S. The Relationship of Cardiovascular Disease to Physical Functioning in Women Surviving to Age 80 and Above in the Women's Health Initiative. J Gerontol A Biol Sci Med Sci 2016; 71 Suppl 1:S42-53. [PMID: 26858324 DOI: 10.1093/gerona/glv087] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Cardiovascular disease (CVD) is highly prevalent at ages 80 and above. The association of physical functioning (PF), a key to an optimal aging trajectory, with CVD and specific CVD diagnosis in women who survive to age 80 and above has not been described previously and has important public health significance given our aging population. METHODS Women's Health Initiative participants aged 80 years or older at the time of self-reporting PF (RAND SF-36) were studied in relationship to CVD diagnosis, whether present at study baseline (1993-1998) or diagnosed during follow-up through 2012. Cross-sectional analyses utilized demographic, medical, lifestyle, and psycho-social questionnaire data from baseline or updated at the time of self-reported PF. RESULTS Among 27,145 older Women's Health Initiative participants, 22.0% (N = 5,959) had been diagnosed with CVD, specifically: 11.3% (N = 3,071) with coronary heart disease; 4.7% (N = 1,279), stroke; 5.2% (N = 1,397), venous thromboembolism; 2.7% (N = 737), peripheral arterial disease; and 2.7% (N = 725), congestive heart failure. PF scores (mean ± SE) were significantly (p < .0001) higher without CVD (60.0 ± 26.9), compared with any CVD (47.9 ± 27.3), and for each specific CVD diagnosis: coronary heart disease (48.8 ± 27.1); stroke (44.8 ± 27.9); venous thromboembolism (48.9 ± 27.4); peripheral arterial disease (41.9 ± 2.2); and congestive heart failure (38.8 ± 26.1). Regardless of CVD diagnosis, higher PF was associated with: younger age at the time of PF assessment; lower body mass index; higher recreational physical activity; better self-reported general health; fewer hip fractures after age 55; no history of arthritis; and no recent use of non-steroidal anti-inflammatory drugs. CONCLUSIONS Older women with any CVD, and particularly women with congestive heart failure or peripheral arterial disease, reported significantly lower PF compared to women with no CVD. Regardless of CVD diagnosis, higher PF was strongly associated with a more active lifestyle and lower body mass index, suggesting potential intervention targets for more optimal aging.
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Affiliation(s)
- Marcia L Stefanick
- Department of Medicine, Stanford Prevention Research Center and Department of Obstetrics & Gynecology, School of Medicine, Stanford University, California.
| | - Robert L Brunner
- Department of Family and Community Medicine, University of Nevada School of Medicine, Reno
| | - X Leng
- Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Marian C Limacher
- Division of Cardiovascular Medicine, Department of Medicine, College of Medicine, University of Florida, Gainesville
| | | | - David O Garcia
- Department of Health Promotion Sciences, University of Arizona Mel and Enid Zuckerman College of Public Health, Tucson
| | - Patricia E Hogan
- Department of Biostatistical Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Michael J LaMonte
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo - SUNY, New York
| | - Rachel H Mackey
- Department of Epidemiology, School of Public Health, University of Pittsburgh, Pennsylvania
| | - Karen C Johnson
- Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis
| | - Andrea LaCroix
- Department of Family and Preventative Medicine, University of California San Diego, La Jolla, California
| | | | - Rebecca A Seguin
- Division of Nutritional Sciences, Cornell University, Ithica, New York
| | - Hilary A Tindle
- Center for Research on Health Care, University of Pittsburgh, Pennsylvania
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Li M, Tian X, Zhang W, Leng X, Zeng X. AB1143 Chinese Rheumatism Data Center (CRDC): The Rheumatology Research Platform in China. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.1780] [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: 11/04/2022]
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Xu P, Cai YN, Leng X, Wang J, Ma W, Mu GD, Jiang J, Liu XY, Wang ZD, Zhao Q, Yang GL. Seroprevalence of Toxoplasma gondii infection in pigs in Jilin Province, Northeastern China. Trop Biomed 2015; 32:116-120. [PMID: 25801260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In the present study, a total of 1,235 porcine serum samples were collected from 9 counties in Jilin Province (40°52'~46°18'N,121°38'~131°19'E), northeastern China from August to October 2013, and the seroprevalence of Toxoplasma gondii infection was tested by indirect haemagglutination assay (IHA). The results showed that antibodies to T. gondii were found in 19.1% (95% confidence interval [CI], 16.9% to 21.3%), with higher seroprevalence in the breeding boars (28.6%, 95% CI, 20.0% to 37.2%), and breeding sows (32.0%, 95% CI, 25.2% to 38.9%). No significant difference was found among the slaughter pigs, fattening pigs and the piglets. These results indicated that infection with T. gondii in pigs is widespread in Jilin province, and is of public health concern.
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Affiliation(s)
- P Xu
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, P.R. China
| | - Y N Cai
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, P.R. China
| | - X Leng
- State Key Laboratory for Molecular Biology, Institute of Special Wild Economic Animal and Plant Science, Chinese Academy of Agricultural Science, Changchun, Jilin Province 130122, P.R. China
| | - J Wang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, P.R. China
| | - W Ma
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, P.R. China
| | - G D Mu
- Jilin Center for Animal Disease Control and Prevention, 4510 Xi'an Road, Changchun, Jilin Province 130062, P.R. China
| | - J Jiang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, P.R. China
| | - X Y Liu
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, P.R. China
| | - Z D Wang
- Institute of Military Veterinary, Academy of Military Medical Sciences, Key Laboratory of Jilin Province for Zoonosis Prevention and Control, 666 Liuying Xilu, Changchun, Jilin Province 130122, P.R. China
| | - Q Zhao
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, P.R. China
| | - G L Yang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, P.R. China
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Brinkley TE, Leng X, Chughtai HL, Nicklas BJ, Kritchevsky SB, Ding J, Kitzman DW, Hundley WG. Periaortic fat and cardiovascular risk: a comparison of high-risk older adults and age-matched healthy controls. Int J Obes (Lond) 2014; 38:1397-402. [PMID: 24525960 PMCID: PMC4143481 DOI: 10.1038/ijo.2014.29] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 02/05/2014] [Accepted: 02/10/2014] [Indexed: 02/07/2023]
Abstract
Objective Fat accumulation around the heart and aorta may impact cardiovascular (CV) health. The purpose of this study was to conduct a systematic investigation to examine potential associations of these fat depots with risk factors for CV events, which has not been done before. Methods Pericardial fat, periaortic fat around the ascending aorta (AA), descending aorta (DA) and aortic arch, and abdominal subcutaneous and visceral fat were measured by MRI in older adults with (n=385, 69±8 years, 52% female) and without (n=50, 69±8 years, 58% female) risk factors for a CV event. Results Individuals with CV risk factors exhibited greater fat volumes across all fat depots compared to those without risk factors. In analysis of covariance accounting for age, gender, race/ethnicity, diabetes, hypertension, coronary artery disease, smoking, and BMI, individuals with risk factors possessed higher epicardial, pericardial, AA, DA, and abdominal visceral fat (p<0.05). When matched one-to-one on age, gender, race/ethnicity, and BMI, AA and DA fat were higher in those with versus without CV risk factors (p<0.01). Conclusions Older adults with a high risk for CV events have greater periaortic fat than low-risk adults, even after accounting for BMI. More studies are needed to determine whether greater periaortic fat predicts future CV events.
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Affiliation(s)
- T E Brinkley
- Section on Gerontology and Geriatric Medicine, Department of Internal Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, USA
| | - X Leng
- Department of Biostatistical Sciences, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - H L Chughtai
- Section on Cardiology, Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - B J Nicklas
- Section on Gerontology and Geriatric Medicine, Department of Internal Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, USA
| | - S B Kritchevsky
- Section on Gerontology and Geriatric Medicine, Department of Internal Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, USA
| | - J Ding
- Section on Gerontology and Geriatric Medicine, Department of Internal Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, NC, USA
| | - D W Kitzman
- Section on Cardiology, Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - W G Hundley
- Section on Cardiology, Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
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Yang R, Chen L, Yang S, Lv C, Leng X, Zhao G. 2D square arrays of protein nanocages through channel-directed electrostatic interactions with poly(α, l-lysine). Chem Commun (Camb) 2014; 50:2879-82. [PMID: 24487730 DOI: 10.1039/c3cc49306g] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Reconstructed ferritin nanocages with expanded 4-fold channels can self-assemble into 2D square arrays through channel-directed electrostatic interactions with poly(α, l-lysine) at pH 7.0. Structurally, protein cages are aligned along their common 4-fold symmetry axis, imposing a fixed disposition of neighboring ferritins.
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Affiliation(s)
- R Yang
- CAU & ACC Joint-Laboratory of Space Food, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing Key Laboratory of Functional Food from Plant Resources, Beijing, 100083, China.
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Abstract
The widespread occurrence of protein channels offers a good opportunity to fabricate protein architectures. Herein, we have developed a novel strategy for linear self-assembly of ferritin cages induced by poly(α, L-lysine) through channel-directed electrostatic interactions at pH 7.0. The length of the formed filaments can be controlled.
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Affiliation(s)
- R Yang
- CAU & ACC Joint-Laboratory of Space Food, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing Key Laboratory of Functional Food from Plant Resources, Beijing, 100083, China.
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Liu CK, Leng X, Hsu FC, Kritchevsky SB, Ding J, Earnest CP, Ferrucci L, Goodpaster BH, Guralnik JM, Lenchik L, Pahor M, Fielding RA. The impact of sarcopenia on a physical activity intervention: the Lifestyle Interventions and Independence for Elders Pilot Study (LIFE-P). J Nutr Health Aging 2014; 18:59-64. [PMID: 24402391 PMCID: PMC4111145 DOI: 10.1007/s12603-013-0369-0] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVE To determine if sarcopenia modulates the response to a physical activity intervention in functionally limited older adults. DESIGN Secondary analysis of a randomized controlled trial. SETTING Three academic centers. PARTICIPANTS Elders aged 70 to 89 years at risk for mobility disability who underwent dual-energy x-ray absorptiometry (DXA) for body composition at enrollment and follow-up at twelve months (N = 177). INTERVENTION Subjects participated in a physical activity program (PA) featuring aerobic, strength, balance, and flexibility training, or a successful aging (SA) educational program about healthy aging. MEASUREMENTS Sarcopenia as determined by measuring appendicular lean mass and adjusting for height and total body fat mass (residuals method), Short Physical Performance Battery score (SPPB), and gait speed determined on 400 meter course. RESULTS At twelve months, sarcopenic and non-sarcopenic subjects in PA tended to have higher mean SPPB scores (8.7±0.5 and 8.7±0.2 points) compared to sarcopenic and non-sarcopenic subjects in SA (8.3±0.5 and 8.4±0.2 points, p = 0.24 and 0.10), although the differences were not statistically significant. At twelve months, faster mean gait speeds were observed in PA: 0.93±0.4 and 0.95±0.03 meters/second in sarcopenic and non-sarcopenic PA subjects, and 0.89±0.4 and 0.91±0.03 meters/second in sarcopenic and non-sarcopenic SA subjects (p = 0.98 and 0.26), although not statistically significant. There was no difference between the sarcopenic and non-sarcopenic groups in intervention adherence or number of adverse events. CONCLUSION These data suggest that older adults with sarcopenia, who represent a vulnerable segment of the elder population, are capable of improvements in physical performance after a physical activity intervention.
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Affiliation(s)
- C K Liu
- Christine Liu, M.D., M.S. Jean Mayer-USDA Human Nutrition Research Center on Aging, Tufts University, 711 Washington Street, Boston, MA 02111-1524, Phone: (617) 556-3377 Fax: (617) 556-3040, E-mail: . Alternate Corresponding Author: E-mail:
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Chakraborty S, Lin YH, Leng X, Miranda RN, Medeiros LJ, Shpall E, Arlinghaus RB. Activation of Jak2 in patients with blast crisis chronic myelogenous leukemia: inhibition of Jak2 inactivates Lyn kinase. Blood Cancer J 2013; 3:e142. [PMID: 24013663 PMCID: PMC3789205 DOI: 10.1038/bcj.2013.41] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Affiliation(s)
- S Chakraborty
- Department of Translational Molecular Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
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Ip EH, Zhang Q, Schwartz R, Tooze J, Leng X, Han H, Williamson DA. Multi-profile hidden Markov model for mood, dietary intake, and physical activity in an intervention study of childhood obesity. Stat Med 2013; 32:3314-31. [PMID: 23322318 PMCID: PMC3710544 DOI: 10.1002/sim.5719] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 11/23/2012] [Accepted: 12/03/2012] [Indexed: 11/08/2022]
Abstract
Motivated by an application to childhood obesity data in a clinical trial, this paper describes a multi-profile hidden Markov model (HMM) that uses several temporal chains of measures respectively related to psychosocial attributes, dietary intake, and energy expenditure behaviors of adolescents in a school setting. Using these psychological and behavioral profiles, the model delineates health states from the longitudinal data set. Furthermore, a two-level regression model that takes into account the clustering effects of students within school is used to assess the effects of school-based and community-based interventions and other risk factors on the transition between health states over time. The results from our study suggest that female students tend to decrease their physical activities despite a high level of anxiety about weight. The finding is consistent across intervention and control arms.
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Affiliation(s)
- E H Ip
- Department of Biostatistical Sciences, Wake Forest University School of Medicine, Winston Salem, NC 27157, USA.
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Li M, Zhang W, Leng X, Li Z, Ye Z, Li C, Li X, Zhu P, Wang Z, Zheng Y, Li X, Zhang M, Zhang F, Zhao Y, Zeng X. Chinese SLE Treatment and Research group (CSTAR) registry: I. Major clinical characteristics of Chinese patients with systemic lupus erythematosus. Lupus 2013; 22:1192-9. [PMID: 23963101 DOI: 10.1177/0961203313499086] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The Chinese systemic lupus erythematosus (SLE) treatment and research group (CSTAR) provides major clinical characteristics of SLE in China and establishes a platform to provide resources for future basic and clinical studies. CSTAR originated as a multicentre, consecutive, and prospective design. The data were collected online from 104 rheumatology centers, which covered 30 provinces in China. The registered patients were required to meet four or more of the American College of Rheumatology (ACR) criteria for the classification of SLE. All CSTAR centers use the same protocol-directed methods to provide uniform evaluations, which included demographic data, clinical features, laboratory examinations, and disease activity evaluations. The patient samples, including DNA samples and sera, were also collected for further quality controls and additional studies. Preliminary analysis from 2104 baseline evaluations was available for this analysis. Of 1914 female and 190 male patients (F:M=10.1), the mean age at onset was 29.2 y with confirmed diagnosis one year later at the age of 30.3 y. Eighty four (4.2%) of 2002 patients had a family history of rheumatic diseases, including 34 (1.7%) cases with SLE. In addition, one hundred and seven (5.2%) abnormal pregnancies were recorded among 2026 experiences. The characteristics of the CSTAR cohort were compared to similarly sized cohorts from other studies. We found that 56.1% of patients presented with concurrent hematological disorders compared to only 18.2% of European patients. Moreover, 47.4% of patients presented with nephropathy compared to 27.9% of European patients. Conversely, neurological manifestations were only seen in 4.8% of Chinese SLE patients compared to 19.4% of European patients, 12.1% of U.S. patients, 22.8% of Malaysian patients and 26.4% of Latin Americans. Pulmonary arterial hypertension and interstitial lung diseases were complications identified in 3.8% and 4.2% of Chinese lupus patients, respectively. The CSTAR registry has provided epidemiological data and phenotypes of Chinese patients with SLE, and has demonstrated several differences between ethnicities. Clinical data and biologic samples would be valuable resources for future translational studies with national and international collaboration.
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Affiliation(s)
- M Li
- 1Department of Rheumatology, Peking Union Medical College Hospital, Key Laboratory of Rheumatology and Clinical Immunology, Ministry of Education, Beijing, China
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Ning D, Leng X, Li Q, Xu W. Surface-displayed VP28 on Bacillus subtilis spores induce protection against white spot syndrome virus in crayfish by oral administration. J Appl Microbiol 2011; 111:1327-36. [PMID: 21933311 DOI: 10.1111/j.1365-2672.2011.05156.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
AIM Surface-displayed heterologous antigens on Bacillus subtilis spores can induce the vertebrate animals tested to generate local and systematic immune response through oral immunization. Here, the protection potential of the recombinant spores displaying the VP28 protein of white spot syndrome virus (WSSV) was investigated in the invertebrate crayfish (Cambarus clarkii). METHODS AND RESULTS The VP28 protein was successfully displayed on the surfaces of B. subtilis spores using CotB or CotC as a fusion partner. Crayfish were administrated orally by feeding the feed pellets coated with B. subtilis spores for 7 days and immediately followed by WSSV challenge. Oral administration of either spores expressing CotB-VP28 or CotC-VP28 resulted in significantly higher relative survival rates of 37.9 and 44.8% compared with the crayfish orally administrated with the spores nonexpressing VP28 (10.3% relative survival rate). When challenges were separately conducted at 7 and 21 days after oral administration, the relative survival rates increased to 46.4 and 50% at 7 days post-oral administration, but decreased to 30 and 33.3% at 21 days after oral administration. CONCLUSION These evidences indicate that the surface-displayed VP28 on B. subtilis spore could induce protection of crayfish against WSSV via oral administration. SIGNIFICANCE AND IMPACT OF THE STUDY This is the first report to use the spore surface display system to deliver orally a heterologous antigen in an aquatic invertebrate animal, crayfish. The results presented here suggest that the spore-displayed VP28 might be suitable for an oral booster vaccine on prevention of WSSV infection in shrimp farming.
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Affiliation(s)
- D Ning
- School of Environment, Jiangsu University, Zhenjiang, China.
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Zhang T, Cong J, Xu D, Leng X, Zhang F. Primary Sjogren's syndrome with tuberculous arthritis of left knee. Case Reports 2011; 2011:bcr.07.2011.4488. [DOI: 10.1136/bcr.07.2011.4488] [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: 11/04/2022] Open
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Leng X, Yang B, Liu Y, Xie Y, Tong J. Synthesis and Characterization of Three Novel Nitrogen-containing Macrolides. Z Naturforsch B 2011. [DOI: 10.5560/znb.2011.66b0930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Leng X, Lin H, Ding T, Wang Y, Wu Y, Klumpp S, Sun T, Zhou Y, Monaco P, Belmont J, Aderem A, Akira S, Strong R, Arlinghaus R. Lipocalin 2 is required for BCR-ABL-induced tumorigenesis. Oncogene 2008; 27:6110-9. [PMID: 18663364 DOI: 10.1038/onc.2008.209] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Our previous studies indicate that reduction of lipocalin 2 (mouse 24p3) expression by either anti-sense or siRNA approaches strongly reduces the overgrowth of BCR-ABL+ mouse myeloid 32D in marrow and spleen of NOD/SCID mice. In this study, we used the mouse bone marrow transplant model to further explore the role of 24p3 in BCR-ABL-induced leukemia. Consistent with our previous findings, when using non-irradiated mice as recipient, donor marrow cells expressing BCR-ABL but lacking 24p3 did not cause leukemia or any disease after 75 days, whereas all mice receiving wild type BCR-ABL donor cells died with CML-like disease. An agar clone of the BCR-ABL+ human CML cell line K562 (C5) that secretes relatively high levels of lipocalin 2 (human NGAL) induced suppression of hematopoiesis in spleen and marrow of mice, leading to early death in contrast to parental K562 or K562 clone (C6) expressing low amounts of NGAL. Compared with K562 cells, overexpressing NGAL in K562 led to a higher apoptosis rate and an atrophy phenotype in the spleen of the inoculated mice. Plasma from both leukemic mice and CML patients showed elevated lipocalin 2 levels compared with healthy individuals. Moreover, we found that a primary stable cell line from wild-type mouse marrow cells expressing BCR-ABL caused solid tumors in nude mice whereas a similar BCR-ABL+ cell line from 24p3 null mice did not. These findings demonstrate that lipocalin 2 has at least two functions related to tumorigenesis, one involving apoptosis induction of normal hematopoietic cells and the other being tissue invasion by leukemia cells.
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Affiliation(s)
- X Leng
- Department of Molecular Pathology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA
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Moguillansky D, Carson A, Leng X, Lavery L, Chen X, Schwartz A, Gretton J, Fischer D, Pacella J, Villanueva F. Quantification of adventitial neovascularization during atherosclerosis progression with contrast ultrasound: a histologic validation. Cardiovascular Revascularization Medicine 2008. [DOI: 10.1016/j.carrev.2008.02.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Weng L, Zou R, Leng X, Zeng X. The two stranded helical silver(I) polymers with 1,4-bis(2-pyridoxy)benzene. Acta Crystallogr A 2002. [DOI: 10.1107/s010876730209757x] [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: 11/10/2022] Open
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Zou R, Weng L, Leng X, Zeng X. 3-D hydrogen bonding network of 1,2-bis((pyridine-3-ylmethyl)ammonium)ethane diperchloride. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302097350] [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: 11/10/2022] Open
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Lu Y, Leng X, Wang H, Xie Q, Li J. 1,3-dichloro-1,1-dimethyl-3,3-diisopropyldistannoxane. Acta Crystallogr C 2001; 57:1391-2. [PMID: 11740092 DOI: 10.1107/s0108270101015645] [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] [Received: 07/10/2001] [Accepted: 09/24/2001] [Indexed: 11/11/2022] Open
Abstract
The title compound, [Sn4(CH3)4(C3H7)4Cl4O2] or [Cl[(CH3)2CH]2SnOSn(CH3)2Cl]2, obtained by the reaction of [(CH3)2CH]2SnO and (CH3)2SnCl2, exists as centrosymmetric dimers in the solid state. It contains a central planar four-membered Sn2O2 ring. The coordinate geometry about the Sn atoms is distorted trigonal pyramidal.
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Affiliation(s)
- Y Lu
- National Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China.
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Abstract
Diffusion dynamics of a polysaccharide, schizophyllan has been studied by fluorescence correlation spectroscopy (FCS). Several different sizes of nondenatured and denatured schizophyllan have been labeled with rhodamine 6G in borate buffer. The length of the nondenatured schizophyllan was calculated from FCS data by using the Broersma's relationship for rod-like macromolecules. The obtained length was close to that obtained by atomic force microscopy (AFM) measurements. Denatured schizophyllan possesses a random coil conformation. Its hydrodynamic radius R(h) was measured by FCS. The relationship between R(h) and the molecular mass M has been studied and the scaling relationship R(h)--M(0.59) has been obtained, which is in agreement with the random coil model with excluded volume effect. The persistence length q(denat) of the denatured schizophyllan was determined by Hearst's relationship, to be equal to 5.16 +/- 0.75 (nm). The work demonstrates the utility of FCS method for dynamics investigations of biopolymers especially in diluted regime (concentration lower than 10(-8)M could be measured) where other techniques could not be used.
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Affiliation(s)
- X Leng
- CABE (Analytical and Biophysical Environmental Chemistry), Department of Inorganic, Analytical and Applied Chemistry, University of Geneva, Science II, 30 Quai Ernest Ansermet, 1211 Geneva 4, Switzerland.
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Cheng J, Leng X, Cai S, Cao Z, Cao G, Peng J, Wang S, Du R. bcl 10 gene mutation in hepatocellular carcinoma. Chin Med J (Engl) 2001; 114:747-51. [PMID: 11780342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
OBJECTIVE To detect the mutation frequency of the bcl 10 gene in the early and advanced stages of hepatocellular carcinoma (HCC). METHODS Genome DNA samples were extracted from 46 cases of fresh HCC tumor tissues and their non-tumor adjacent tissues. Polymerase chain reaction-single strand conformation polymorphism method was used to detect point mutations of the three exons of the bcl 10 gene. For each individual exon, six random samples from those showing abnormal DNA bands were sequenced to verify those mutations. The relationship between serum alpha-fetoprotein (AFP) level and bcl 10 mutation, between the tumor size and bcl 10 mutation was also analyzed. RESULTS Among the 46 samples, 26 cases (56.5%) were found to have mutations in exon 1, 5 out of the 6 cases were shown to have 5744 C-->G mutation by sequencing; 25 cases (54.3%) were found to have mutations in exon 2, 4 out of the 6 cases were shown to have 11,311 T deletion mutation by sequencing. Twenty-one cases (45.7%) were found to have mutations in exon 3, all of the 6 cases selected for sequencing were shown to have 14,116 C-->T mutation. Statistical analysis showed that neither serum alpha-fetoprotein level nor the size of hepatocellular carcinoma has a significant relationship with bcl 10 mutation. CONCLUSION The bcl 10 gene has a high mutation frequency in liver cancer.
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Affiliation(s)
- J Cheng
- Department of Surgery, Peking University People's Hospital, Beijing 100044, China
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Cai S, Leng X, Wang Y. [Expression of two types of melanoma antigens in hepatocellular carcinoma]. Zhonghua Zhong Liu Za Zhi 2001; 23:205-7. [PMID: 11783086] [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: 02/23/2023]
Abstract
OBJECTIVE To investigate the expression of melanoma antigen MAGE-4 and MAGE-10 mRNA in Chinese human hepatocellular carcinoma (HCC). METHODS The expression of MAGE-4 and MAGE-10 mRNA in HCC tissues and the adjacent non-HCC liver tissues was studied using RT-PCR in 48 samples of HCC. Ten samples of cirrhosis and 10 samples of normal liver tissues were examined. The PCR products were sequenced. RESULTS Of the 48 HCC samples studied, 15 (31.3%) and 14 (29.2%) expressed MAGE-4 and MAGE-10 mRNA respectively. In contrast, none of the HCC adjacent non-tumorous liver tissues were MAGE-4 and MAGE-10 mRNA detectable. Nor did liver tissues from cirrhosis and normal liver samples. The expression of the two genes in HCC showed no correlation with the serum level of AFP and the tumor size. CONCLUSION MAGE-4 and MAGE-10 mRNA are specifically expressed in Chinese HCC samples.
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Affiliation(s)
- S Cai
- Surgical Department, People's Hospital, Beijing University, Beijing 100044, China
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