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Yu Y, Yang L, Zhang Y, Dong L, Xia J, Zhu N, Han X, Fang L, Chai Y, Niu M, Liu L, Yang X, Qu S, Li S. Incidence and risk factors of chronic thromboembolic pulmonary hypertension in patients with diagnosis of pulmonary embolism for the first time in real world. CLINICAL RESPIRATORY JOURNAL 2018; 12:2551-2558. [PMID: 30160381 DOI: 10.1111/crj.12955] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 06/16/2018] [Accepted: 08/15/2018] [Indexed: 11/29/2022]
Abstract
BACKGROUND The incidence and risk factors of chronic thromboembolic pulmonary hypertension (CTEPH) in patients with acute pulmonary embolism (PE) have been well reported. However, in real world, patients diagnosed with PE for the first time were usually composed of acute PE, sub-acute PE, and chronic PE, and the cumulative incidence and risk factors of CTEPH in this cohort were still unknown. METHODS A prospective, long-term, follow-up study was conducted to assess the incidence of symptomatic CTEPH in consecutive patients with PE diagnosed for the first time. Patients with unexplained persistent dyspnea during follow-up underwent transthoracic echocardiography and, if the findings indicated pulmonary hypertension, ventilation-perfusion lung scanning and right heart catheterization. CTEPH was confirmed if perfusion defects were present, mean pulmonary artery pressure (mPAP) ≥25 mmHg and pulmonary artery wedge pressure (PAWP) ≤15 mmHg. RESULTS The cumulative incidence of CTEPH in patients with PE diagnosed for the first time was 11.2% at 3 months, 12.7% at 1 year, 13.4% at 2 years, and 14.5% at 3 years. The following factors increased the risk of CTEPH: time from symptoms to treatment of PE ≥1 month (odds ratio (OR), 14.77), intermediate (OR, 37.63) to high risk PE (OR, 39.81), segmental and sub-segmental branch location of embolism (OR, 8.30) and PE-related primary risk factors (OR, 5.01). 9.4% of CTEPH patients developed from acute PE, and 90.6% from sub-acute and chronic PE. CONCLUSIONS In real world, CTEPH is a relatively common and serious complication in PE patients diagnosed for the first time. Early diagnosis and treatment of PE will decrease the incidence of CTEPH in these unspecified patients.
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Xia J, Tang W, Nie Q, Dong S, Zhong W. P2.16-47 “Improved aBVA Method” and “Anterior VAB Method” Result in Analogous Survival Benefits During Right Upper Lobectomy. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Guo L, Xie W, Liu Y, Yang Z, Yang X, Xia J, Wang S, Wu Q, Zhang Y. Identification and characterization of doublesex in Bemisia tabaci. INSECT MOLECULAR BIOLOGY 2018; 27:620-632. [PMID: 29660189 DOI: 10.1111/imb.12494] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Bemisia tabaci (Gennadius) is an important agricultural pest with a worldwide distribution. Although B. tabaci is known to have a unique haplodiploid reproductive strategy, its sex determination mechanism is largely unknown. In this study, we cloned the full-length sequence of B. tabaci doublesex (Btdsx) and found that Btdsx has 28 splicing isoforms. We found two new splicing isoforms of transformer 2 (Bttra2), which encode two proteins. We also confirmed that both genes lack sex-specific splicing isoforms. Real-time quantitative PCR analysis showed that the expression of Btdsx and Bttra2 is higher in males than in females. RNA interference of Bttra2 affected the expression of Btdsx and vice versa. Furthermore, silencing of Bttra2 or Btdsx caused malformation of the male genitalia (anal style). It did not affect the female phenotype, but reduced the expression of vitellogenin gene in females. These results indicate that Btdsx is associated with sex determination in B. tabaci and that Btdsx and Bttra2 affect each other and are important for male genitalia formation. In addition to increasing our understanding of the roles of dsx and tra2 in the sex determination of B. tabaci, the results will be useful for studies of sex determination in other haplodiploid species.
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Wang J, Xia J, Zhang R, Yan X, Yang Y, Zhao X, Chang H, Wang G, Chen G, Liu Y, Chen Y, Jia B, Zhang Z, Ding W, Huang R, Wu C. A novel index using routine clinical parameters for predicting significant liver inflammation in chronic hepatitis B. J Viral Hepat 2018; 25:1151-1160. [PMID: 29741221 DOI: 10.1111/jvh.12925] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Accepted: 04/20/2018] [Indexed: 12/14/2022]
Abstract
Identifying the degree of liver inflammation is critical for therapeutic judgement of patients with chronic hepatitis B (CHB). However, we lack indexes which can accurately predict significant liver inflammation in patients with CHB. This study aimed to develop a simple predictive index for liver inflammation in CHB using routine clinical parameters. A total of 519 patients with CHB who underwent liver biopsy were enrolled and randomly divided into training (n = 346) and validation cohorts (n = 173). Based on routine clinical parameters, gamma-glutamyl transpeptidase (GGT; P = 0.031) and platelets (PLT; P < 0.001) were identified as independent predictors of significant inflammation by multivariable analysis in the training cohort. Accordingly, the GGT to PLT ratio (GPR) was developed to amplify the opposing effects for predicting liver inflammation. In the training cohort, the AUCs of GPR in predicting significant inflammation were 0.791 (95% CI: 0.742-0.839), 0.783 (95% CI: 0.717-0.849) and 0.791 (95% CI: 0.716-0.867) in the entire patients with CHB, HBeAg-positive CHB patients and HBeAg-negative CHB patients, respectively. The diagnostic performance of GPR for significant inflammation was significantly superior to that of alanine aminotransferase (ALT), aspartate transaminase (AST) and GGT in all patients with CHB and HBeAg-positive CHB patients, but was comparable with ALT, AST and GGT in HBeAg-negative CHB patients. In the validation cohort, the diagnostic performance of GPR in assessing significant liver inflammation was also superior to other indexes in all patients with CHB and HBeAg-positive CHB patients, but was comparable with GGT in HBeAg-negative CHB patients. Thus, GPR can be a novel and simple index for predicting significant liver inflammation in CHB, especially for HBeAg-positive CHB.
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Ling Y, Xia J, Koji K, Zhang X, Li Z. First Report of Damping-Off Caused by Pythium arrhenomanes on Rice in China. PLANT DISEASE 2018; 102:PDIS01180113PDN. [PMID: 30226417 DOI: 10.1094/pdis-01-18-0113-pdn] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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Ellis Hilts K, Xia J, Yeager VA, Ferdinand AO, Menachemi N. Market characteristics associated with community health assessments by local health departments. Public Health 2018; 162:118-125. [PMID: 30029173 DOI: 10.1016/j.puhe.2018.05.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 05/18/2018] [Accepted: 05/30/2018] [Indexed: 10/28/2022]
Abstract
OBJECTIVES Community health assessments (CHAs) have been promoted as a strategy for population health. This study uses the resource dependence theory (RDT) to examine how external market characteristics are associated with CHAs conducted by local health departments (LHDs) and subsequent partnering with hospitals for CHAs in the United States. STUDY DESIGN The RDT was used to guide the conceptualization of the market in the context of local public health. RDT emphasizes that organizations are not in control of all the resources they need and, to some extent, must rely on the external environment to provide those necessary resources. Binary measures were used to examine whether LHDs conducted CHAs and whether they did so in partnership with a local hospital. Independent variables were identified to measure the RDT constructs of munificence (resource availability in the environment), complexity (level of heterogeneity), and dynamism (level of environmental turbulence). METHODS Bivariate (Chi-squared and t-tests) and multivariate (logistic regression) cross-sectional analyses were conducted using secondary data from the National Association of County and City Health Officials 2013 Profile Survey, the 2013 County Health Rankings data set, and the Health Resources and Services Administration's Area Health Resource File. RESULTS Two of three variables measuring munificence were positively associated with having conducted a CHA; one variable was also related to doing so in conjunction with a local hospital. One measure of market complexity was negatively associated with having conducted a CHA. No measure of dynamism was related to the dependent variables. CONCLUSIONS Study results provide partial support for the use of RDT in understanding the relationship between market factors and LHDs' activities around CHAs. Local hospitals as partners and other market factors should be considered by LHDs when conducting CHAs. Findings from this work will be of interest to public health practitioners, policy-makers, and researchers interested in public health and population health improvement.
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Xia J, Xu Q, Zhang Q, Chen Z, Chen Y, Lu Y, Wang P, Sun Y, Cheng Y. High frequency repetitive transcranial magnetic stimulation of the motor cortex can alleviate non-fluent aphasia after stroke. Ann Phys Rehabil Med 2018. [DOI: 10.1016/j.rehab.2018.05.601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Xia J, Lü ZD, Zhou PH, Cui SC, Kong B, Liu D, Long SS, Zhang XH, Zhao JJ. [DNA methylation modification of BRMS1 in triple-negative breast cancer and its correlation with tumor metastasis]. ZHONGHUA YI XUE ZA ZHI 2018; 97:3483-3487. [PMID: 29275584 DOI: 10.3760/cma.j.issn.0376-2491.2017.44.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effect of methylation status of breast cancer metastasis suppressor gene 1 (BRMS1) on the expression of breast cancer and the biological behavior of cancer cells in triple-negative breast cancer (TNBC). Methods: The expression of BRMS1 in TNBC tissues and corresponding non-malignant tissues and its relationship with clinicopathological parameters were detected by immunohistochemistry. The mRNA and protein expression of BRMS1 in normal breast epithelial cells and TNBC cells were detected by reverse transcription-polymerase chain reaction (RT-PCR) and Western blotting. The methylation specific polymerase chain reaction (MSP) was used to detect the methylation status of BRMS1 in each cell. These cells were treated with demethylated preparations (5-Aza-dC) to re-activate BRMS1 expression. Using tumor cell invasion assay to detect influence of BRMS1 demethylation on the invasion capacity of cancer cells. The data were statistically analyzed. Results: The positive expression rate of BRMS1 protein in TNBC tissues was significantly lower than that in corresponding non-malignant tissues (χ(2)= 6.635, P<0.05). The mRNA expression level of BRMS1 in patients with lymph node metastasis was significantly lower than those with no lymph node metastasis (P=0.018). The down-regulation of BRMS1 expression was related to the methylation of DNA promoter, which was statistically significant (χ(2)=14.68, P<0.05). The mRNA and protein expression of BRMS1 was also correlated with tumor size and TNM staging (P=0.000-0.003). After using 5-Aza-dC, the number of cells with invasive capacity was significantly lower than those of the control group (t=3.262-10.72, P<0.05). Conclusions: The decrease of BRMS1 expression in TNBC cells is related to the methylation of DNA. Demethylation can inhibit the invasion of breast cancer cells.
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Chang T, Xia J, Xu L, Wang X, Zhu B, Zhang L, Gao X, Chen Y, Li J, Gao H. A genome-wide association study suggests several novel candidate genes for carcass traits in Chinese Simmental beef cattle. Anim Genet 2018; 49:312-316. [DOI: 10.1111/age.12667] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2018] [Indexed: 02/05/2023]
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85
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Jiang N, Xia J, Jiang B, Xu Y, Li Y. TUG1 alleviates hypoxia injury by targeting miR-124 in H9c2 cells. Biomed Pharmacother 2018; 103:1669-1677. [PMID: 29864957 DOI: 10.1016/j.biopha.2018.04.191] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 04/25/2018] [Accepted: 04/29/2018] [Indexed: 11/18/2022] Open
Abstract
TUG1 has been reported to play an important role in various cancer types. However, the study about the function of lncRNA TUG1 in myocardial infarction is limited. This study was aimed to investigate the role of TUG1 in H9c2 cell injury induced by hypoxia and explore its possible molecular mechanism. The proliferation assay, migration assay, invasion assay, and apoptosis assay were performed. RT-PCR was used to determine the relative RNA expression of TUG1, miR-124 and Hic-5. Western blotting was used to detect the expression levels of apoptotic proteins, Hic-5, Sp1, and Survivin. Hypoxia could significantly decrease cell proliferation, migration and invasion and increase H9c2 cell apoptosis. Knock-down of TUG1 promoted the cell damage induced by hypoxia. miR-124 was the direct target of TUG1 and down-regulated by TUG1. TUG1 silence aggravated hypoxia injury by up-regulating miR-124. In addition, Hic-5 was the target of miR-124 and negatively regulated by miR-124. Our findings showed that Hic-5 over-expression could significantly induce increases in cell viability, migration and invasion, and induce decrease in cell apoptosis after hypoxia damage. Over-expression of Hic-5 could increase the expression of Sp1 and Survivin, which inhibited the cell apoptosis, thereby reducing the cell damage induced by hypoxia.
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Xia J, Jiang N, Li Y, Wei Y, Zhang X. The long noncoding RNA THRIL knockdown protects hypoxia-induced injuries of H9C2 cells through regulating miR-99a. Cardiol J 2018; 26:564-574. [PMID: 29745968 DOI: 10.5603/cj.a2018.0054] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 01/03/2018] [Accepted: 01/15/2018] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Myocardial infarction (MI) is a leading cause of disease with high morbidity and mortality worldwide. Recent studies have revealed that long non-coding RNAs (lncRNAs) are involved in heart disease pathogenesis. This study aimed to investigate the effect and the molecular basis of THRIL on hypoxia-injured H9C2 cells. METHODS THRIL, miR-99a and Brahma-related gene 1 (Brg1) expressions in H9C2 cells were altered by transient transfections. The cells were subjected to hypoxia for 4 h, and then the levels of THRIL, miR-99a and Brg1 were investigated. Cell viability, migration and invasion, and apoptotic cells were respectively measured by trypan blue exclusion assay, transwell migration assay and flow cytometry assay. Dual luciferase reporter assay was conducted to verify the interaction between miR-99a and THRIL. Furthermore, levels of apoptosis-, PI3K/AKT and mTOR pathways-related factors were measured by western blotting. RESULTS Hypoxia induced an increase of THRIL but a reduction of miR-99a and Brg1. THRIL inhibition significantly attenuated hypoxia-induced cell injuries, as increased cell viability, migration and invasion, and decreased cell apoptosis. THRIL negatively regulated miR-99a expression through sponging with miR-99a binding site, and miR-99a inhibition abolished the protective effects of THRIL knockdown against hypoxia-induced injury in H9C2 cells. Furthermore, miR-99a positively regulated the expression of Brg1. Brg1 inhibition promoted hypoxia-induced cell injuries, while Brg1 overexpression alleviated hypoxia-induced cell injuries. Moreover, Brg1 overexpression activated PI3K/AKT and mTOR pathways. CONCLUSIONS This study demonstrated that THRIL inhibition represented a protective effect against hypoxia-induced injuries in H9C2 cells by up-regulating miR-99a expression.
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Lin J, Li X, Xue B, Tong Q, Chen Z, Zhu W, Li J, Xia J. Corrigendum to “Low-dosage of rituximab in Chinese patients with neuromyelitis optica spectrum disorder” [Journal of Neuroimmunology 317C (2018) pp. 1-4]. J Neuroimmunol 2018; 318:114. [DOI: 10.1016/j.jneuroim.2018.03.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Miao J, Wang X, Bao J, Jin S, Chang T, Xia J, Yang L, Zhu B, Xu L, Zhang L, Gao X, Chen Y, Li J, Gao H. Multimarker and rare variants genomewide association studies for bone weight in Simmental cattle. J Anim Breed Genet 2018; 135:159-169. [DOI: 10.1111/jbg.12326] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 03/27/2018] [Indexed: 12/30/2022]
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Xia J, Yang L, Dong L, Niu M, Zhang S, Yang Z, Wumaier G, Li Y, Wei X, Gong Y, Zhu N, Li S. Cefminox, a Dual Agonist of Prostacyclin Receptor and Peroxisome Proliferator-Activated Receptor-Gamma Identified by Virtual Screening, Has Therapeutic Efficacy against Hypoxia-Induced Pulmonary Hypertension in Rats. Front Pharmacol 2018. [PMID: 29527168 PMCID: PMC5829529 DOI: 10.3389/fphar.2018.00134] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Prostacyclin receptor (IP) and peroxisome proliferator-activated receptor-gamma (PPARγ) are both potential targets for treatment of pulmonary arterial hypertension (PAH). Expression of IP and PPARγ decreases in PAH, suggesting that screening of dual agonists of IP and PPARγ might be an efficient method for drug discovery. Virtual screening (VS) of potential IP-PPARγ dual-targeting agonists was performed in the ZINC database. Ten of the identified compounds were further screened, and cefminox was found to dramatically inhibit growth of PASMCs with no obvious cytotoxicity. Growth inhibition by cefminox was partially reversed by both the IP antagonist RO113842 and the PPARγ antagonist GW9662. Investigation of the underlying mechanisms of action demonstrated that cefminox inhibits the protein kinase B (Akt)/mammalian target of rapamycin (mTOR) signaling pathway through up-regulation of the expression of phosphatase and tensin homolog (PTEN, which is inhibited by GW9662), and enhances cyclic adenosine monophosphate (cAMP) production in PASMCs (which is inhibited by RO113842). In a rat model of hypoxia-induced pulmonary hypertension, cefminox displayed therapeutic efficacy not inferior to that of the prostacyclin analog iloprost or the PPARγ agonist rosiglitazone. Our results identified cefminox as a dual agonist of IP and PPARγ that significantly inhibits PASMC proliferation by up-regulation of PTEN and cAMP, suggesting that it has potential for treatment of PAH.
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Ge J, Li H, Sun F, Li XN, Lin J, Xia J, Zhang C, Li JL. Transport stress-induced cerebrum oxidative stress is not mitigated by activating the Nrf2 antioxidant defense response in newly hatched chicks. J Anim Sci 2017; 95:2871-2878. [PMID: 28727098 DOI: 10.2527/jas.2017.1559] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Transportation of newly hatched chicks from the hatchery to the farm is inevitable, especially for parent stock and grandsire parent stock chicks. However, the possible effects of transport stress in the newly hatched chicks are poorly understood. The aim of this study was to determine the adaptive responses to transport stress by activing the nuclear factor-erythroid 2-related factor 2 (Nrf2)-induced antioxidant defense. One hundred twenty newly hatched chicks were divided into 3 groups (control group, transport group, and simulation transport group) for 2, 4, and 8 h of real or simulated transportation. Transport stress could cause oxidative stress in the cerebrum of newly hatched chicks by increasing lipid peroxidation and production of free radicals and decreasing the activities of antioxidant enzymes and the glutathione:oxidized glutathione ratio. Transport stress activated the Nrf2 signaling pathway and triggered the transcription of antioxidant parameters. However, transport stress-induced cerebrum oxidative stress was not mitigated by activating the Nrf2 antioxidant defense response in newly hatched chicks.
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Li Y, Xia J, Jiang N, Xian Y, Ju H, Wei Y, Zhang X. Corin protects H 2O 2-induced apoptosis through PI3K/AKT and NF-κB pathway in cardiomyocytes. Biomed Pharmacother 2017; 97:594-599. [PMID: 29101802 DOI: 10.1016/j.biopha.2017.10.090] [Citation(s) in RCA: 89] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 10/11/2017] [Accepted: 10/18/2017] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND The functional role of corin in H2O2-induced apoptosis is largely unexplored. The present study investigated the protective role of corin against cell injury by possible involvement of PI3K/AKT and NF-kB signaling pathways in cardiomyocytes. METHOD Cardiomyocytes H9c2 and HL-1 cells were used in the study. Cell viability was measured using CCK-8 assay; cell apoptosis was analyzed by flow cytometry, TUNEL assay, and western blot; and cell migration was measured using wound healing assay. The fluorescent intensities of reactive oxygen species (ROS) were measured using a flow cytometer. Quantitative RT-PCR was used to measure the mRNA expression of corin. Western blot was used to measure the protein expression of corin, apoptosis-related proteins (Bax, cleaved-Caspase-3 and -9), and PI3K/AKT and NF-κB signaling pathway proteins. RESULTS Treatment with H2O2 (150μM, 6h) significantly decreased cell viability and relative migration, increased apoptosis, and decreased the expression of corin in H9c2 and HL-1 cells. Overexpression of corin alleviated the H2O2-induced cell injury by increasing cell viability and migration and decreasing apoptosis in the cardiomyocytes. Overexpression of corin also decreased the ROS level in the cardiomyocytes likely through upregulating HIF-1α. These effects of corin on the cell injury might be mediated via the corin-induced activations of PI3K/AKT and NF-κB signaling pathways. CONCLUSION Overexpression of corin protected cardiomyocytes from H2O2-induced injury by decreasing apoptosis and ROS level via activations of the PI3K/AKT and NF-κB signaling pathways and upregulating HIF-1α.
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Zhang X, Zhang X, Weng D, Xia J, Xu R. A study of multiple-antigen specific cellular therapy in vitro combined with PD-1 antibody technology (MASCT-I) in patients with advanced solid tumors. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx666.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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93
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Thomas S, Kuiper B, Hu J, Smit J, Liao Z, Zhong Z, Rijnders G, Vailionis A, Wu R, Koster G, Xia J. Localized Control of Curie Temperature in Perovskite Oxide Film by Capping-Layer-Induced Octahedral Distortion. PHYSICAL REVIEW LETTERS 2017; 119:177203. [PMID: 29219472 DOI: 10.1103/physrevlett.119.177203] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Indexed: 06/07/2023]
Abstract
With reduced dimensionality, it is often easier to modify the properties of ultrathin films than their bulk counterparts. Strain engineering, usually achieved by choosing appropriate substrates, has been proven effective in controlling the properties of perovskite oxide films. An emerging alternative route for developing new multifunctional perovskite is by modification of the oxygen octahedral structure. Here we report the control of structural oxygen octahedral rotation in ultrathin perovskite SrRuO_{3} films by the deposition of a SrTiO_{3} capping layer, which can be lithographically patterned to achieve local control. Using a scanning Sagnac magnetic microscope, we show an increase in the Curie temperature of SrRuO_{3} due to the suppression octahedral rotations revealed by the synchrotron x-ray diffraction. This capping-layer-based technique may open new possibilities for developing functional oxide materials.
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Mohiuddin I, Flynn R, Buatti J, Xia J. Holographic Visualization of Radiation Dosimetry Towards Intuitive Plan Evaluation. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.2288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Huang R, Wang J, Xia J, Yan X, Wu C. Letter: lipid-lowering effect of tenofovir disoproxil fumarate in chronic hepatitis B-more evidence is needed. Aliment Pharmacol Ther 2017; 46:769-770. [PMID: 28901572 DOI: 10.1111/apt.14266] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Xia J, Su M. Chip-scale alignment of long DNA nanofibers on a patterned self-assembled monolayer. LAB ON A CHIP 2017; 17:3234-3239. [PMID: 28820213 DOI: 10.1039/c7lc00676d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Controlled alignment of long DNA nanofibers is challenging. This communication reports a method to align human genomic DNA with nearly unlimited length using lithographically produced micro-patterns of self-assembled monolayers (SAMs) with positively charged terminal groups. The micro-patterns act as local DNA reservoirs to supply DNAs for nanofiber formation, and can also stretch and align DNA nanofibers to form an ordered array by controlling the dewetting profile. By reducing the size and inter-patch distance of a micro-patch, a nearly uniform array of long DNA nanofibers can be patterned over a large area. A controlled motion of a DNA containing droplet allows for free patterning of DNA nanofibers and production of complex structures without a transfer process. Bending of DNA nanofibers due to local distortion of the contact line bridges more adjacent micro-patches and increases the chance of producing continuous nanofibers. The interplay between surface tension and electrostatic attraction of positively charged micro-patterns allows the production of long DNA nanofibers in a simple yet powerful way.
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McNamara GI, Davis BA, Browne M, Humby T, Dalley JW, Xia J, John RM, Isles AR. Dopaminergic and behavioural changes in a loss-of-imprinting model of Cdkn1c. GENES BRAIN AND BEHAVIOR 2017; 17:149-157. [PMID: 28857482 PMCID: PMC5836939 DOI: 10.1111/gbb.12422] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 08/18/2017] [Accepted: 08/25/2017] [Indexed: 02/01/2023]
Abstract
The imprinted gene Cdkn1c is expressed exclusively from the maternally inherited allele as a consequences of epigenetic regulation. Cdkn1c exemplifies many of the functional characteristics of imprinted genes, playing a role in foetal growth and placental development. However, Cdkn1c also plays an important role in the brain, being key to the appropriate proliferation and differentiation of midbrain dopaminergic neurons. Using a transgenic model (Cdkn1cBACx1) with a twofold elevation in Cdkn1c expression that mimics loss‐of‐imprinting, we show that increased expression of Cdkn1c in the brain gives rise to neurobiological and behavioural changes indicative of a functionally altered dopaminergic system. Cdkn1cBACX1 mice displayed altered expression of dopamine system‐related genes, increased tyrosine hydroxylase (Th) staining and increased tissue content of dopamine in the striatum. In addition, Cdkn1cBACx1 animals were hypersensitive to amphetamine as showed by c‐fos expression in the nucleus accumbens. Cdkn1cBACX1 mice had significant changes in behaviours that are dependent on the mesolimbic dopaminergic system. Specifically, increased motivation for palatable food stuffs, as indexed on a progressive ratio task. In addition, Cdkn1cBACX1 mice displayed enhanced social dominance. These data show, for the first time, the consequence of elevated Cdkn1c expression on dopamine‐related behaviours highlighting the importance of correct dosage of this imprinted gene in the brain. This work has significant relevance for deepening our understanding of the epigenetic factors that can shape neurobiology and behaviour.
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98
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Lian Y, Gao C, Wu Y, Xia J, Leng Y, Liu Y, Zhu M, Chen J, Qi Z. Suppression of Delayed Xenograft Rejection by Resveratrol in a Hamster-to-Rat Cardiac Transplantation Model. Transplant Proc 2017; 49:1483-1491. [DOI: 10.1016/j.transproceed.2017.03.091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 03/09/2017] [Accepted: 03/30/2017] [Indexed: 12/13/2022]
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99
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Stern A, Dzero M, Galitski VM, Fisk Z, Xia J. Surface-dominated conduction up to 240 K in the Kondo insulator SmB 6 under strain. NATURE MATERIALS 2017; 16:708-711. [PMID: 28369051 DOI: 10.1038/nmat4888] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 03/06/2017] [Indexed: 06/07/2023]
Abstract
SmB6 is a strongly correlated mixed-valence Kondo insulator with a newly discovered surface state, proposed to be of non-trivial topological origin. However, the surface state dominates electrical conduction only below T∗ ≈ 4 K (ref. ), limiting its scientific investigation and device application. Here, we report the enhancement of T∗ in SmB6 under the application of tensile strain. With 0.7% tensile strain we report surface-dominated conduction at up to a temperature of 240 K, persisting even after the strain has been removed. This can be explained in the framework of strain-tuned temporal and spatial fluctuations of f-electron configurations, which might be generally applied to other mixed-valence materials. We note that this amount of strain can be induced in epitaxial SmB6 films via substrate in potential device applications.
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100
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Huang R, Yan X, Xia J, Wang J, Wu C. Letter: hepatitis B virus reactivation in patients with chronic hepatitis C during direct-acting anti-viral therapy. Aliment Pharmacol Ther 2017; 45:1558. [PMID: 28503862 DOI: 10.1111/apt.14080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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