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Li DF, Tian YH, Shi RY, Kong C, Zhou J, Wang LS, Jun Y. A ghost epigastric pain. Rev Esp Enferm Dig 2024. [PMID: 38767030 DOI: 10.17235/reed.2024.10500/2024] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
A 16-year-old woman complained of intermittent epigastric pain for one year. The gastroscopy, colonoscopy and laboratory findings were normal. Physical examination was unremarkable other than upper abdominal tenderness. The symptom was not relieved in past medical treatment. The abdominal computed tomography (CT) scan revealed appendix wall swelling and suspected appendicitis. Endoscopic retrograde appendicitis therapy (ERAT) with eyeMax (Micro-tech, China) was proposed to perform after informed consent obtained. A colonoscopy with a transparent cap (Olympus, Japan) attached to the tip was inserted into the cecum, and advanced the level of appendicular orifice. Subsequently, the Gerlach's valve was pushed aside using the transparent cap. Finally, the eyeMax was placed in the appendicular orifice, slowly moved forward in appendicular lumen. The eyeMax showed a lot of appendicular stones, and irrigated repeatedly. The stones were expulsed smoothly. The patient was discharged two days later without recurrent epigastric pain on follow-up and to date.
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Affiliation(s)
- De-Feng Li
- Gastroenterology, Shenzhen People's Hospital, China
| | | | - Rui-Yue Shi
- Gastroenterology, Shenzhen People's Hospital, China
| | - Chen Kong
- Gastroenterology, Shenzhen People's Hospital
| | - Jing Zhou
- Gastroenterology, Shenzhen People's Hospital
| | | | - Yao Jun
- Gastroenterology, Shenzhen People's Hospital
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Abstract
BACKGROUND Apelin is an endogenous neuropeptide that binds to the G-protein-coupled receptor (APJ) and participates in a variety of physiological processes in the heart, lungs and other peripheral organs. Intriguingly, [Pyr1]-Apelin-13, a highly potent pyroglutamic form of apelin, has the potential to bind to and be degraded by angiotensin-converting enzyme 2 (ACE2). ACE2 is known to operate as a viral receptor in the early stages of severe acute respiratory coronavirus (SARS-CoV-2) infection. AIM This study aimed to determine if apelin protects against SARS-CoV-2 infection by inhibiting ACE2 binding to SARS-CoV-2 spike protein. DESIGN AND METHODS To determine whether [Pyr1]-Apelin-13 inhibits ACE2 binding to the SARS-CoV-2 spike protein (S protein), we performed a cell-to-cell fusion assay using ACE2-expressing cells and S protein-expressing cells and a pseudovirus-based inhibition assay. We then analyzed publicly available transcriptome data while focusing on the beneficial effects of apelin on the lungs. RESULTS We found that [Pyr1]-Apelin-13 inhibits cell-to-cell fusion mediated by ACE2 binding to the S protein. In this experiment, [Pyr1]-Apelin-13 protected human bronchial epithelial cells, infected with pseudo-typed lentivirus-producing S protein, against viral infection. In the presence of [Pyr1]-Apelin-13, the level of viral spike protein expression was also reduced in a concentration-dependent manner. Transcriptome analysis revealed that apelin may control inflammatory responses to viral infection by inhibiting the nuclear factor kappa B pathway. CONCLUSION Apelin is a potential therapeutic candidate against SARS-CoV-2 infection.
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Affiliation(s)
- J Park
- From the Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Korea
| | - M -Y Park
- From the Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Korea
| | - Y Kim
- From the Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, Korea
| | - Y Jun
- Cell Logistics Research Center, Gwangju Institute of Science and Technology, Gwangju, Korea
| | - U Lee
- Department of Cardiac Surgery, Boston Children’s Hospital, Boston, MA, USA
| | - C -M Oh
- Address correspondence to C.-M. Oh, Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Korea.
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Li Y, Tan Z, Zhang Y, Zhang Z, Hu Q, Liang K, Jun Y, Ye Y, Li YC, Li C, Liao L, Xu J, Xing Z, Pan Y, Chatterjee SS, Nguyen TK, Hsiao H, Egranov SD, Putluri N, Coarfa C, Hawke DH, Gunaratne PH, Tsai KL, Han L, Hung MC, Calin GA, Namour F, Guéant JL, Muntau AC, Blau N, Sutton VR, Schiff M, Feillet F, Zhang S, Lin C, Yang L. A noncoding RNA modulator potentiates phenylalanine metabolism in mice. Science 2021; 373:662-673. [PMID: 34353949 PMCID: PMC9714245 DOI: 10.1126/science.aba4991] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 08/31/2020] [Accepted: 06/25/2021] [Indexed: 12/13/2022]
Abstract
The functional role of long noncoding RNAs (lncRNAs) in inherited metabolic disorders, including phenylketonuria (PKU), is unknown. Here, we demonstrate that the mouse lncRNA Pair and human HULC associate with phenylalanine hydroxylase (PAH). Pair-knockout mice exhibited excessive blood phenylalanine (Phe), musty odor, hypopigmentation, growth retardation, and progressive neurological symptoms including seizures, which faithfully models human PKU. HULC depletion led to reduced PAH enzymatic activities in human induced pluripotent stem cell-differentiated hepatocytes. Mechanistically, HULC modulated the enzymatic activities of PAH by facilitating PAH-substrate and PAH-cofactor interactions. To develop a therapeutic strategy for restoring liver lncRNAs, we designed GalNAc-tagged lncRNA mimics that exhibit liver enrichment. Treatment with GalNAc-HULC mimics reduced excessive Phe in Pair -/- and Pah R408W/R408W mice and improved the Phe tolerance of these mice.
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Affiliation(s)
- Yajuan Li
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Zhi Tan
- Intelligent Molecular Discovery Laboratory, Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA
| | - Yaohua Zhang
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Zhao Zhang
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX 77030, USA
| | - Qingsong Hu
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Ke Liang
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Yao Jun
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Youqiong Ye
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX 77030, USA
| | - Yi-Chuan Li
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX 77030, USA
| | - Chunlai Li
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Lan Liao
- Genetically Engineered Mouse Core, Advanced Technology Cores, Baylor College of Medicine, Houston, TX 77030, USA
| | - Jianming Xu
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Zhen Xing
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Yinghong Pan
- Department of Biochemistry and Biology, University of Houston, Houston, TX 77030, USA
| | - Sujash S Chatterjee
- Department of Biochemistry and Biology, University of Houston, Houston, TX 77030, USA
| | - Tina K Nguyen
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Heidi Hsiao
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Sergey D Egranov
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Nagireddy Putluri
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - Cristian Coarfa
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA
| | - David H Hawke
- Department of Systems Biology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Preethi H Gunaratne
- Department of Biochemistry and Biology, University of Houston, Houston, TX 77030, USA
| | - Kuang-Lei Tsai
- Department of Biochemistry and Molecular Biology, The University of Texas Health Science Center at Houston McGovern Medical School, Houston, TX 77030, USA
| | - Leng Han
- Center for Epigenetics and Disease Prevention, Institute of Biosciences and Technology, Texas A&M University, Houston, TX 77030, USA
| | - Mien-Chie Hung
- Graduate Institute of Biomedical Sciences, Research Center for Cancer Biology, and Center for Molecular Medicine, China Medical University, Taichung 404, Taiwan
- Department of Biotechnology, Asia University, Taichung 413, Taiwan
| | - George A Calin
- Department of Translational Molecular Pathology, Division of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Fares Namour
- Department of Molecular Medicine and Reference Center for Inborn Errors of Metabolism, University Hospital of Nancy, Nancy F-54000, France
- INSERM, U1256, NGERE - Nutrition, Genetics, and Environmental Risk Exposure, University of Lorraine, Nancy F-54000, France
| | - Jean-Louis Guéant
- Department of Molecular Medicine and Reference Center for Inborn Errors of Metabolism, University Hospital of Nancy, Nancy F-54000, France
- INSERM, U1256, NGERE - Nutrition, Genetics, and Environmental Risk Exposure, University of Lorraine, Nancy F-54000, France
| | - Ania C Muntau
- University Children's Hospital, University Medical Center Hamburg Eppendorf, Hamburg 20246, Germany
| | - Nenad Blau
- Division of Metabolism, University Children's Hospital Zurich, CH-8032 Zurich, Switzerland
| | - V Reid Sutton
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | - Manuel Schiff
- Necker Hospital, APHP, Reference Center for Inborn Error of Metabolism and Filière G2M, Pediatrics Department, University of Paris, Paris 75007, France
- Inserm UMR_S1163, Institut Imagine, Paris 75015, France
| | - François Feillet
- INSERM, U1256, NGERE - Nutrition, Genetics, and Environmental Risk Exposure, University of Lorraine, Nancy F-54000, France.
- Pediatric Department Reference Center for Inborn Errors of Metabolism Children University Hospital Nancy, Nancy F-54000, France
| | - Shuxing Zhang
- Intelligent Molecular Discovery Laboratory, Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77054, USA.
- The Graduate School of Biomedical Sciences, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Chunru Lin
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
- The Graduate School of Biomedical Sciences, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Liuqing Yang
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
- The Graduate School of Biomedical Sciences, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
- Center for RNA Interference and Non-Coding RNAs, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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Xin L, Junhua W, Long L, Jun Y, Yang X. Exogenous Hydrogen Sulfide Protects SH-SY5Y Cells from OGD/RInduced Injury. Curr Mol Med 2019; 17:563-567. [PMID: 29473502 DOI: 10.2174/1566524018666180222121643] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 01/16/2018] [Accepted: 02/16/2018] [Indexed: 11/22/2022]
Abstract
BACKGROUND Cerebral ischemia reperfusion (CIR) injury is the main pathological mechanism of ischemia stroke, and oxidative stress (OS) plays a vital role during the process of CIR. Recent studies have found that OS can activate MAPK pathway, which mainly functions as a mediator of cellular stresses. It revealed that H2S may exhibit multiple biological functions as a neuroprotector through protecting against OS-induced neuronal injury. But how H2S can attenuate ischemia/reoxygenation injury through MAPK signaling is not clear. The protective mechanism of exogenous hydrogen sulfide (H2S) on oxygen glucose deprivation/reoxygenation (OGD/R) at physiological doses in SH-SY5Y cells were investigated in this study. METHODS DCFH- DA probe is used to measure intracellular ROS, Real-time PCR and Western blot are used to detect the levels of p38 MAPK, ERK3 and Nrf2. CCK-8 is used to detect cell viability. RESULTS Comparing with the normal control group, the expressions of ERK3, p38MAPK and Nrf2 mRNA in other three groups were downregulated at the beginning of 24h. After 24h, the expressions of ERK3, p38MAPK and Nrf2 were upregulated significantly compared with the normal control group. When the cells were pretreated with 200μM NaHS at the beginning of 24h, the expressions of ERK3, p38MAPK and Nrf2 were decreased much more significantly than OGD/R and NaHS groups. CONCLUSION The present study demonstrated that exogenous H2S exerts a protective effect against OGD/R-induced injury by enhancing the activation of the ERK3, p38MAPK and Nrf2 mRNA.
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Affiliation(s)
- L Xin
- Department of Neurology, XiangYa Hospital, Central South University, Changsha, Hunan 410008, China
| | - W Junhua
- Department of Neurology, XiangYa Hospital, Central South University, Changsha, Hunan 410008, China
| | - L Long
- Department of Neurology, XiangYa Hospital, Central South University, Changsha, Hunan 410008, China
| | - Y Jun
- Department of Neurology, XiangYa Hospital, Central South University, Changsha, Hunan 410008, China
| | - X Yang
- Department of Neurology, XiangYa Hospital, Central South University, Changsha, Hunan 410008, China
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5
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Choe S, Kim S, Jun Y, Lee W, Kang I, Koong M, Heo J, Sim C, Koh Y, Park D, Yoon T. Ambient air pollution is associated with success of in-vitro fertilization cycles: a retrospective study in Seoul, Korea. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.959] [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: 11/27/2022]
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Li Y, Li X, Wang J, Jun Y, Tang Z. A cobalt tungstate compound sensing electrode for hydrogen detection based upon mixed-potential type sensors. RSC Adv 2017. [DOI: 10.1039/c6ra25407a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An yttria-stabilized cubic zirconia (YSZ) based mixed-potential sensor coupled with CoWO4 as the sensing electrode was developed for hydrogen detection at elevated temperatures.
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Affiliation(s)
- Y. Li
- School of Electronic Science and Technology
- Institute for Sensing Technologies
- Key Lab. of Liaoning for Integrated Circuits Technology
- Dalian University of Technology
- Dalian 116024
| | - X. Li
- School of Electronic Science and Technology
- Institute for Sensing Technologies
- Key Lab. of Liaoning for Integrated Circuits Technology
- Dalian University of Technology
- Dalian 116024
| | - J. Wang
- School of Electronic Science and Technology
- Institute for Sensing Technologies
- Key Lab. of Liaoning for Integrated Circuits Technology
- Dalian University of Technology
- Dalian 116024
| | - Y. Jun
- School of Electronic Science and Technology
- Institute for Sensing Technologies
- Key Lab. of Liaoning for Integrated Circuits Technology
- Dalian University of Technology
- Dalian 116024
| | - Z. Tang
- School of Electronic Science and Technology
- Institute for Sensing Technologies
- Key Lab. of Liaoning for Integrated Circuits Technology
- Dalian University of Technology
- Dalian 116024
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7
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Jun Y, Chao Jun Y, Jian Y, Zhi Xing F. PM144 RP105 Alleviates Myocardial Ischemia Reperfusion Injury Via Inhibiting TLR4/Trif Signaling Pathways. Glob Heart 2016. [DOI: 10.1016/j.gheart.2016.03.331] [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: 10/21/2022] Open
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Abstract
The temporomandibular joint (TMJ) disc is a heterogeneous fibrocartilaginous tissue positioned between the mandibular condyle and glenoid fossa of the temporal bone, with important roles in TMJ functions. Tissue engineering TMJ discs has emerged as an alternative approach to overcoming limitations of current treatments for TMJ disorders. However, the anisotropic collagen orientation and inhomogeneous fibrocartilaginous matrix distribution present challenges in the tissue engineering of functional TMJ discs. Here, we developed 3-dimensional (3D)-printed anatomically correct scaffolds with region-variant microstrand alignment, mimicking anisotropic collagen alignment in the TMJ disc and corresponding mechanical properties. Connective tissue growth factor (CTGF) and transforming growth factor beta 3 (TGFβ3) were then delivered in the scaffolds by spatially embedding CTGF- or TGFβ3-encapsulated microspheres (µS) to reconstruct the regionally variant fibrocartilaginous matrix in the native TMJ disc. When cultured with human mesenchymal stem/progenitor cells (MSCs) for 6 wk, 3D-printed scaffolds with CTGF/TGFβ3-µS resulted in a heterogeneous fibrocartilaginous matrix with overall distribution of collagen-rich fibrous structure in the anterior/posterior (AP) bands and fibrocartilaginous matrix in the intermediate zone, reminiscent of the native TMJ disc. High dose of CTGF/TGFβ3-µS (100 mg µS/g of scaffold) showed significantly more collagen II and aggrecan in the intermediate zone than a low dose (50 mg µS/g of scaffold). Similarly, a high dose of CTGF/TGFβ3-µS yielded significantly higher collagen I expression in the AP bands compared with the low-dose and empty µS. From stress relaxation tests, the ratio of relaxation modulus to instantaneous modulus was significantly smaller with CTGF/TGFβ3-µS than empty µS. Similarly, a significantly higher coefficient of viscosity was achieved with the high dose of CTGF/TGFβ3-µS compared with the low-dose and empty µS, suggesting the dose effect of CTGF and TGFβ3 on fibrocartilage formation. Together, our findings may represent an efficient approach to engineering the TMJ disc graft with anisotropic scaffold microstructure, heterogeneous fibrocartilaginous matrix, and region-dependent viscoelastic properties.
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Affiliation(s)
- K Legemate
- Academic Centre for Dentistry Program (ACTA), University of Amsterdam, Amsterdam, Netherlands
| | - S Tarafder
- Regenerative Engineering Laboratory, Section for Oral and Maxillofacial Surgery, College of Dental Medicine, Columbia University, New York, NY, USA
| | - Y Jun
- Regenerative Engineering Laboratory, Section for Oral and Maxillofacial Surgery, College of Dental Medicine, Columbia University, New York, NY, USA
| | - C H Lee
- Regenerative Engineering Laboratory, Section for Oral and Maxillofacial Surgery, College of Dental Medicine, Columbia University, New York, NY, USA
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Jingjing S, Mijia Z, Xiaoqia Y, Chi Z, Jun Y. Microbial, Urease Activities and Organic Matter Responses to Nitrogen Rate in Cultivated Soil. ACTA ACUST UNITED AC 2015. [DOI: 10.2174/1874070701509010014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Nitrogen (N) fertilizer is an important field management, this paper was to investigate the responses of microbial activity measured by microcalorimetric technique, urease activity and organic matter to proper nitrogen (N) fertilizer in cultivated system in the North China Plain. The microcalorimetry results showed that microorganisms under proper N fertilizer rate got the efficient metabolism. The maximum heat production (Pmax) of microcalorimetry parameter implied that increasing the N fertilizer rate, Pmax did not increase always but firstly increased than decreased. In addition, from soil urease activity and organic matter studies, high soil urease activity due to both N fertilizer rate and growth stage and these had light influence on soil organic matter. These results suggest that only proper amount of N fertilizer rate and suitable topdressing for a good wheat-growing environment.
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Li Z, Jun Y, Zhong-Bao R, Jie L, Jian-Ming L. Association between MTHFR C677T polymorphism and congenital heart disease. A family-based meta-analysis. Herz 2014; 40 Suppl 2:160-7. [PMID: 25256053 DOI: 10.1007/s00059-014-4144-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 07/23/2014] [Indexed: 12/22/2022]
Abstract
Congenital heart disease (CHD) is the most common type of birth defect. It is suspected that polymorphisms in folate metabolism are associated with an increased risk of CHD, but the conclusion remains unclear. Studies have reported that the MTHFR C677T polymorphism was associated with the development of structural congenital heart malformations. The objective of this study was to conduct a meta-analysis of available studies to identify common polymorphisms in the MTHFR gene in children with CHD and their mothers and to test for an association between genotype and disease. In all, 19 eligible studies comprising 4,219 cases and 20,123 controls were included in this meta-analysis. A significant association was found between the MTHFR C677T polymorphism and CHD risk (OR: 1.26; 95 % CI = 1.06-1.51; p = 0.009) with no strong evidence of heterogeneity (I(2) = 39 %) in the fetal analysis. In the maternal analysis, the MTHFR C677T polymorphism was significantly associated with CHD risk (OR = 1.52; 95 % CI = 1.09-2.11; p = 0.01) with significant heterogeneity (I(2) = 63 %).
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Affiliation(s)
- Z Li
- Department of Cardiology, Institute of Medical Research, Taizhou People's Hospital, Yingchun Road 210, 225300, Taizhou, Jiangsu Province, China
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Sandy EH, Blake RE, Chang SJ, Jun Y, Yu C. Oxygen isotope signature of UV degradation of glyphosate and phosphonoacetate: tracing sources and cycling of phosphonates. J Hazard Mater 2013; 260:947-54. [PMID: 23892161 DOI: 10.1016/j.jhazmat.2013.06.057] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [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: 04/02/2013] [Revised: 06/05/2013] [Accepted: 06/22/2013] [Indexed: 06/02/2023]
Abstract
The degradation of phosphonates in the natural environment constitutes a major route by which orthophosphate (Pi) is regenerated from organic phosphorus and recently implicated in marine methane production, with ramifications to environmental pollution issues and global climate change concerns. This work explores the application of stable oxygen isotope analysis in elucidating the CP bond cleavage mechanism(s) of phosphonates by UV photo-oxidation and for tracing their sources in the environment. The two model phosphonates used, glyphosate and phosphonoacetic acid were effectively degraded after exposure to UV irradiation. The isotope results indicate the involvement of both ambient water and atmospheric oxygen in the CP bond cleavage and generally consistent with previously posited mechanisms of UV-photon excitation reactions. A model developed to calculate the oxygen isotopic composition of the original phosphonate P-moiety, shows both synthetic phosphonates having distinctly lower values compared to naturally derived organophosphorus compounds. Such mechanistic models, based on O-isotope probing, are useful for tracing the sources and reactions of phosphonates in the environment.
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Affiliation(s)
- Edward H Sandy
- State Key Laboratory of Biogeology & Environmental Geology, China University of Geosciences, Wuhan 430074, PR China
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Park C, Lee J, Jun Y, Choi C, Son K, Park K. Surgical strategy for an anomalous origin of the right coronary artery. J Cardiothorac Surg 2013. [PMCID: PMC3844575 DOI: 10.1186/1749-8090-8-s1-o142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Park C, Lee J, Jun Y, Choi C, Son K, Park K, Kim K, Cho H. Have a novel guideline of American Heart Association outlived usefulness in early differentiated diagnosis of acute aortic dissection. J Cardiothorac Surg 2013. [PMCID: PMC3844724 DOI: 10.1186/1749-8090-8-s1-p10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Abstract
ABSTRACTIt is well recognized that controlling surface forces is one of the key issues in the design, fabrication, and operation of microelectromechanical systems (MEMS). In this report we present a novel strategy for the efficient assembly of organic monolayers onto silicon surfaces to control surface energy. This is achieved by the reaction between an alcohol functional group and a chlorinated Si surface. The resulting molecular monolayers are thermally and chemically stable. Surface adhesion energy on silicon is reduced by a factor of 40 by the monolayer coating and friction coefficient of the coated surface is only 0.013. The coatings are successfully demonstrated in adhesion reduction in a model MEMS structure: cantilever beam array (CBA). Polycrystalline beams with length up to 1.5 mm can be released.
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Jun Y. Clinical and Radiographic Investigation of rhBMP-2 Application on Patient Affected by Biphosphonate-Related Osteonecrosis of the Jaw. J Oral Maxillofac Surg 2010. [DOI: 10.1016/j.joms.2010.06.069] [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: 10/19/2022]
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Jun Y, -Yi L, Jian-Ben L, Qin Z, Xia Q, Peng L, Jia-Xin D, Song-Sheng Q, Zi-Niu Y. Inhibition of Model Compound of Purple Acid Phosphatases on Growth of Aerobacter aerogenes Investigated by Microcalorimetry. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.20030210810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kékedy-Nagy L, Jun Y, Darvasi E, Kékedy-Nagy L. Determination of zinc in vegetal tissue microsamples by platinum-wire loop in flame atomization atomic absorption spectrometry. ACTA ACUST UNITED AC 2008; 70:1234-9. [PMID: 17604113 DOI: 10.1016/j.jbbm.2007.04.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2006] [Revised: 04/17/2007] [Accepted: 04/29/2007] [Indexed: 10/23/2022]
Abstract
The zinc content of 3 microL of vegetal samples (tree leaves, lichens and grape sap) atomized from a Pt-wire in the methane-air flame has been determined by atomic absorption spectrometry. The effect of gas flow rates and the atomization height in the flame on the absorption of zinc was evaluated at 213.9 nm. The best results were obtained at a height of 5 mm and gas flow rates of 200 L/h air and 26 L/h methane, respectively. The effect of Na, K, Ca, Mg, SO4(2-), and PO4(3-) on the absorption of zinc was studied too. The detection limit of 0.40+/-0.21 ng was obtained at a significance level of 0.05, using the two-step Neyman-Pearson criterion. The zinc content of the samples has been determined with continuous nebulization and by atomization from the Pt-wire, using both the standard calibration curve and the standard addition method. The results of the two procedures agree within the determination errors.
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Affiliation(s)
- Ladislau Kékedy-Nagy
- Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, 400028 Cluj-Napoca, Str. Arany János 11, Romania.
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Steenbakkers MFM, van Batenburg MF, Bauer TS, Blok HP, Botto T, Dodge GE, Groep DL, Heimberg P, Hesselink WHA, Higinbotham DW, Jans E, Jun Y, Ketel TJ, Lapikás L, de Lange DJJ, Norum BE, Passchier I, Starink R, Todor L, de Vries H. Quasifree pi0 and pi- electroproduction on 4He in the Delta-resonance region. Phys Rev Lett 2005; 95:172501. [PMID: 16383822 DOI: 10.1103/physrevlett.95.172501] [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] [Subscribe] [Scholar Register] [Received: 02/11/2005] [Indexed: 05/05/2023]
Abstract
The reactions 4He(e, e' p3He)pi- and 4He(e, e' p3He)pi0 were studied simultaneously, and for the first time, in a large kinematical domain including the Delta-resonance region. This was achieved by detecting the recoiling 3He and 3H nuclei instead of the emitted pions. The dependences of the cross section on the recoil momentum p(rec), the invariant mass WpiN, and the direction thetapi,q' and phipi,q' of the produced pion, are globally well described by the results of (quasifree) distorted-wave impulse approximation calculations. However, in the Delta-resonance region there are clear discrepancies, which point to medium modifications of the Delta in 4He.
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Affiliation(s)
- M F M Steenbakkers
- Department of Physics and Astronomy, Free University de Boelelaan, 1081 HV Amsterdam, The Netherlands
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19
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Jun Y, Yi L, Yong T, Jianben L, Xiong C, Qin Z, Jiaxin D, Songsheng Q, Ziniu Y. The action of Cu2+ on Bacillus thuringiensis growth investigated by microcalorimetry. Prikl Biokhim Mikrobiol 2003; 39:656-60. [PMID: 14714479] [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: 04/27/2023]
Abstract
By using an LKB-2277 Bioactivity Monitor, ampoule mode, the heat output of Bacillus thuringiensis growth metabolism has been determined at 28 degrees C and effect of Cu2+ on B. thuringiensis growth was studied. Copper has been regarded as an essential trace element for life. Its deficiency may be the cause of diseases. Cu2+ of different concentration have different effects on B. thuringiensis growth metabolism, Cu2+ of low concentration (0-30 micrograms/ml) can promote the growth of B. thuringiensis, and Cu2+ of high concentration (40-120 micrograms/ml) is able to inhibit its growth and B. thuringiensis can't grow at all when the concentration of Cu2+ is up to 130 micrograms/ml.
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Affiliation(s)
- Yao Jun
- Key Laboratory of Agricultural Microbiology of Chinese Agriculture Ministry, Huazhong Agricultural University, Wuhan 430070, P. R. China
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Jun Y, Yi L, Peng L, Zhenting G, Ming S, Songsheng Q, Ziniu Y, Yunfen S. Microcalorimetric investigation of the effect of manganese(II) on the growth of Tetrahymena shanghaiensis S199. Biol Trace Elem Res 2003; 92:71-82. [PMID: 12721406 DOI: 10.1385/bter:92:1:71] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2001] [Revised: 02/07/2002] [Accepted: 09/18/2002] [Indexed: 11/11/2022]
Abstract
The heat output of and the effect of manganese (II) on Tetrahymena shanghaiensis S199 growth metabolism has been determined by means of a LKB-2277 BioActivity monitor. Different concentrations of manganese(II) ions have different effects on the growth of T. shanghaiensis. At low concentrations (0-40 microg/mL) culture growth is promoted, whereas high concentrations (60-800 microg/mL) slow growth. Furthermore, concentrations of 1200 microg/mL or greater stop the growth of this protozooa completely.
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Affiliation(s)
- Yao Jun
- Key Laboratory of Agricultural Microbiology of Chinese Agriculture Ministry, Huazhong Agricultural University, Jishou, Hunan 416000, People's Republic of China
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21
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Jun Y, Yi L, Peng L, Huigang L, Ming S, Songsheng Q, Ziniu Y. Study of the thermokinetic properties of copper(II) on Escherichia coli growth. Biol Trace Elem Res 2003; 92:61-70. [PMID: 12721405 DOI: 10.1385/bter:92:1:61] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2002] [Accepted: 09/13/2002] [Indexed: 11/11/2022]
Abstract
By using an LKB2277 Bioactivity Monitor, stop-flow mode, the power-time curves of Escherichia coli at 37 degrees C affected by Cu(II) were determined. Some parameters, such as growth rate constants k, inhibitory ratio I, the heat output Qlog in the log phase, and the generation times G were obtained. According to these parameters, we found that a low concentration of Cu(II) (0-20 microg/mL) had an promoting action on the growth of E. coli, but a high concentration of Cu(II) (40-100 microg/mL) had an inhibitory action. The toxicity of Cu(II) can also be expressed as the half-inhibitory concentration IC50; the value is 69.7 microg/mL. The assay is quantitative, inexpensive, and versatile.
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Affiliation(s)
- Yao Jun
- Key Laboratory of Agricultural Microbiology of Chinese Agriculture Ministry, Huazhong Agricultural University, Wuhan 430070, People's Republic of China
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Shihua Q, Jun Y, Gan Z, Jiamo F, Guoying S, Zhishi W, Tong SM, Tang UW, Yunshun M. Distribution of polycyclic aromatic hydrocarbons in aerosols and dustfall in Macao. Environ Monit Assess 2001; 72:115-127. [PMID: 11720220 DOI: 10.1023/a:1012036902749] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs), widespread environmental pollutants, have been measured in aerosols and dustfall in Macao. In this paper, we compare concentration distributions and determine the partitioning of PAHs in aerosols and dustfall for different areas, sampling times and sampling heights. The results demonstrate that the concentrations of sigmaPAHs in aerosols and dustfall vary at the different sites and heights. The concentrations of sigmaPAHs and most of the individual PAHs in aerosols at night were higher than those in the daytime when using the unit of microg/g and lower than those when using the unit of microg m(-3). It is shown that the distribution of individual PAHs in aerosols differs significantly from that in dustfall.
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Affiliation(s)
- Q Shihua
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, PR China
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24
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Kosuge K, Jun Y, Watanabe H, Kimura M, Nishimoto M, Ishizaki T, Ohashi K. Effects of CYP3A4 inhibition by diltiazem on pharmacokinetics and dynamics of diazepam in relation to CYP2C19 genotype status. Drug Metab Dispos 2001; 29:1284-9. [PMID: 11560871] [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: 02/21/2023] Open
Abstract
Diazepam is metabolized by CYP2C19 and CYP3A4 in the liver. CYP2C19 shows genetic polymorphism associated with the poor metabolizer (PM) and extensive metabolizer (EM) phenotypes. The aim of this study was to assess the effect of diltiazem, a CYP3A4 inhibitor, on pharmacokinetics and dynamics of diazepam in relation to CYP2C19 genotype status. Thirteen healthy volunteers (eight EMs and five PMs) were given placebo or diltiazem (200 mg) orally for 3 days before and for 7 days after the oral 2-mg dose of diazepam in a double-blind, randomized, crossover manner. The pharmacokinetics and pharmacodynamics of diazepam were assessed with and without diltiazem. Plasma concentrations and area under the plasma concentration-time curves (AUCs) of diazepam and N-desmethyldiazepam were significantly greater in the PM compared with the EM group during the placebo phase. Diltiazem significantly increased AUC and prolonged elimination t(1/2) of diazepam in both the PM and EM groups. These pharmacokinetic changes, however, caused no significant difference in the pharmacodynamics between the two trial phases. Diltiazem affects the pharmacokinetics of diazepam in the PM and EM groups of CYP2C19. Inhibition of CYP3A4 by a concomitant substrate drug like diltiazem may cause a pharmacokinetic interaction with diazepam irrespective of CYP2C19 genotype status, but whether this interaction would reflect a pharmacodynamic change of diazepam remains unconfirmed by our study.
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Affiliation(s)
- K Kosuge
- Department of Clinical Pharmacology and Therapeutics, Hamamatsu University School of Medicine, Hamamatsu, Japan.
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Fan GX, Qing LX, Jun Y, Mei Z. Molecular studies and prenatal diagnosis of phenylketonuria in Chinese patients. Southeast Asian J Trop Med Public Health 2001; 30 Suppl 2:63-5. [PMID: 11400788] [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: 02/20/2023]
Abstract
Phenylketonuria (PKU) is one of the most common inborn errors of metabolic disorders. Although PKU induced mental retardation can be prevented after neonatal screening by following treatment with low phenylalanine diet, some parents are seeking prenatal diagnosis. We screened for mutations in exon 3 and 7 of the PAH gene using the DGGE and restriction enzyme method, in combination with STR linkage analysis. Prenatal diagnosis was carried out in 8 PKU families. With this strategy, we are able to make prenatal diagnosis in about 65-70% PKU families. All diagnosis was confirmed in the newborn.
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Affiliation(s)
- G X Fan
- Xin Hua Hospital, Shanghai Second Medical University, Shanghai Institute for Pediatric Research, China.
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Fan GX, Jun Y, Rui-guan C. Neonatal screening of phenylketonuria and congenital hypothyroidism in China. Southeast Asian J Trop Med Public Health 2001; 30 Suppl 2:17-9. [PMID: 11400761] [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: 02/20/2023]
Abstract
Mass screening of newborns for some congenital metabolic diseases is a tremendous achievement in the field of preventive medicine. The pilot study of neonatal screening in China was started in 1981. According to the results of 1.1 million newborn screenings from 8 big cities in the past 6 years, the incidence of phenylketonuria was 1/14,767 and congenital hypothyroidism was 1/5,469. China is a vast country with great economic differences among the different regions, making neonatal screening difficult in some areas. The national neonatal screening coverage rate is only about 2 % at the moment, but in metropolitan centers like Shanghai, the coverage rate reached 95 % in 1997.
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Affiliation(s)
- G X Fan
- Xin Hua Hospital, Shanghai Second Medical University, Shanghai Institute for Pediatric Research, China.
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27
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Wu ZS, Yu L, Lin YJ, Jun ZJ, Min WS, Jun Y, Hua ZB. Rapid intravenous administration of amino acids prevents biliary sludge induced by total parenteral nutrition in humans. J Hepatobiliary Pancreat Surg 2001; 7:504-9. [PMID: 11180878 DOI: 10.1007/s005340070022] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2000] [Accepted: 08/08/2000] [Indexed: 11/25/2022]
Abstract
The aim of this study was to evaluate whether daily rapid intravenous administration of amino acids (IVAA) prevented the formation of biliary sludge in humans receiving long-term total parenteral nutrition (TPN). Thirty adult patients receiving TPN for more than 28 consecutive days were studied. They were randomized to receive either saline solution (placebo) intravenously (15 patients) or 6.9% branched chain amino acid (BCAA)-enriched amino acid (15 synthetic amino acids; Freamine HBC) solution given by administration rapid intravenous (15 patients). The groups were similar with respect to age, sex, diagnosis, liver function test results, amylase levels, TPN time, and time of study. All patients underwent weekly ultrasound studies. Volume and emptying studies of the gallbladder in response to the study drug were performed after 1 week. As a result, none of the patients receiving rapid IVAA had sludge, whereas 11 of the 15 patients receiving placebo had sludge (P < 0.01). Results of emptying studies showed significant contraction of the gallbladder in those in the rapid IVAA group, but not in the placebo group. Consequently, the data suggest that rapid IVAA given daily prevents TPN-induced stasis and sludge in the gallbladder. We conclude that rapid IVAA should be used as routine prophylaxis against biliary sludge and formation of gallstones in patients receiving long-term TPN.
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Affiliation(s)
- Z S Wu
- Department of Surgery, the First People's Hospital of Ri Zhao City, Shandong Province, 276800, P.R. China
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28
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Lee S, Yoon J, Park B, Jun Y, Jin M, Sung HC, Kim IH, Kang S, Choi EJ, Ahn BY, Ahn K. Structural and functional dissection of human cytomegalovirus US3 in binding major histocompatibility complex class I molecules. J Virol 2000; 74:11262-9. [PMID: 11070025 PMCID: PMC113228 DOI: 10.1128/jvi.74.23.11262-11269.2000] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The human cytomegalovirus US3, an endoplasmic reticulum (ER)-resident transmembrane glycoprotein, forms a complex with major histocompatibility complex (MHC) class I molecules and retains them in the ER, thereby preventing cytolysis by cytotoxic T lymphocytes. To identify which parts of US3 confine the protein to the ER and which parts are responsible for the association with MHC class I molecules, we constructed truncated mutant and chimeric forms in which US3 domains were exchanged with corresponding domains of CD4 and analyzed them for their intracellular localization and the ability to associate with MHC class I molecules. All of the truncated mutant and chimeric proteins containing the luminal domain of US3 were retained in the ER, while replacement of the US3 luminal domain with that of CD4 led to cell surface expression of the chimera. Thus, the luminal domain of US3 was sufficient for ER retention. Immunolocalization of the US3 glycoprotein after nocodazole treatment and the observation that the carbohydrate moiety of the US3 glycoprotein was not modified by Golgi enzymes indicated that the ER localization of US3 involved true retention, without recycling through the Golgi. Unlike the ER retention signal, the ability to associate with MHC class I molecules required the transmembrane domain in addition to the luminal domain of US3. Direct interaction between US3 and MHC class I molecules could be demonstrated after in vitro translation by coimmunoprecipitation. Together, the present data indicate that the properties that allow US3 to be localized in the ER and bind MHC class I molecules are located in different parts of the molecule.
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Affiliation(s)
- S Lee
- Graduate School of Biotechnology, Korea University, Seoul 136-701, Korea
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29
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Sun S, Korhonen T, Uutela A, Korhonen HJ, Puska P, Jun Y, Chonghua Y, Zeyu G, Yonghao W, Wenqing X. International Quit and Win 1996: comparative evaluation study in China and Finland. Tob Control 2000; 9:303-9. [PMID: 10982574 PMCID: PMC1748374 DOI: 10.1136/tc.9.3.303] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVES To compare background and process variables, as well as follow up status, of the participants in the International Quit and Win '96 contests of China and Finland, and analyse factors contributing to sustained maintenance. DESIGN A standardised 12 month follow up was conducted in both countries with random samples of participants. The sample sizes were 3119 in China and 1448 in Finland, with response rates of 91.2% and 65.2%, respectively. INTERVENTIONS The International Quit and Win '96 contest was the second coordinated, multinational smoking cessation campaign targeted at adult daily smokers. Altogether 25 countries participated, including China with 15 000 and Finland with 6000 smokers registered. MAIN OUTCOME MEASURES Conservative (considering all non-respondents relapsed) and non-conservative (based on respondents only) estimates were calculated for one month abstinence, 12 month continuous abstinence, and point abstinence at the time point of follow up. RESULTS Great differences were found in the background and process variables, as well as in the outcome measures. At one year follow up, the conservative continuous abstinence rates show that the Chinese participants maintained their abstinence better (38%) compared to the Finnish ones (12%). In China women reached higher abstinence rate (50%) than men (36%), whereas in Finland men achieved a better result (14%) than women (9%). CONCLUSIONS The Quit and Win contest is a mass smoking cessation method feasible in countries showing great variance in smoking habits and rates. However, in countries with different stages of anti-smoking development, such as China and Finland, different practical implementation strategies may be needed.
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Affiliation(s)
- S Sun
- National Public Health Institute, Helsinki, Finland
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30
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Ping W, Qizi Y, Hesheng O, Lijia T, Jun Y, Chaoshu T. Endogenous heme oxygenase/carbon monoxide system mediates lipopolysaccharide-induced intussusception in rats. Chin Med Sci J 2000; 15:89-92. [PMID: 12901630] [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: 03/04/2023]
Abstract
OBJECTIVES To investigate the role of endogenous heme oxygenase (HO)/carbon monoxide (CO) system in regulating the process of intussusception (IN) induced by administration of lipopolysaccharide (LPS) in rats. METHODS IN model of rats were induced by lipopolysaccharide. HO activity was determined by the amount of bilirubin formation which was measured with a double-beam spectrophotometer, and HbCO formation was measured by CO-oximeter. RESULTS The results showed that LPS (10 mg/kg) caused IN in up to 40% of the rats at 6 h after each treatment of LPS. The incidence of IN were significantly increased by 50% (P < 0.05) and by 83.2% (P < 0.01) in HO substrate (heme-L-lysinate)-treated rats and in exogenous CO-treated rats, respectively; but it was sigificantly decreased by 41.8% (P < 0.05) after administration of ZnDPBG, an inhibitor of heme oxygense (HO) activity. Furthermore, LPS increased HO activity, HbCO formation cGMP content within colic smooth muscle and the plasma level of cGMP, and these parameters were significantly elevated by 62.6% (P < 0.01), 40.0% (P < 0.01), 49.3% (P < 0.05) and 38.9% (P<0.05), respectively, compared with LPS-non-IN rats. CONCLUSION It is suggested that endogenous HO/CO system plays an important role in the process of IN induced by LPS, and inhibition of HO activity may decrease the formation of IN.
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Affiliation(s)
- W Ping
- Pediatric Surgery, First Clinical Hospital, Beijing Medical University, Beijing 100034
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31
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Xiaohong W, Jun Y, Lijia T, Jingyi S, Chaoshu T, Naikui L. C-type natriuretic peptide inhibits upregulation of alpha1-adrenoceptor and inositol 1,4,5-trisphosphate receptor in rat vascular smooth muscle after vascular endothelial injury. Chin Med Sci J 2000; 15:73-8. [PMID: 12901627] [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: 03/04/2023]
Abstract
OBJECTIVE In a model of balloon injury of rat aortic endothelium, the effects of C-type natriuretic peptide (CNP) on alpha1-adrenoreceptor and inositol 1,4,5-triphosphate (IP3) receptor were studied. METHODS Aortic injuries were produced by vascular endothelium-denudation. Alpha1-adrenoreceptor in smooth muscle sarcolemma and IP3 receptor in smooth muscle sarcoplasmic reticulum in the rat aorta were assayed by radioactive analysis method. RESULTS It was found that neointima was formed and the contents of DNA, collagen and elastin of each intima-media were sigificantly increased in 7 days and 21 days after balloon injury of rat aorta. Alpha1-adrenoreceptor in smooth muscle sarcolemma and IF3 receptor in sarcoplasmic reticulum were also upregulated. Results also showed that the administration of CNP i.p. significantly decreased the contents of DNA, collagen and elastin of each intima-media, and inhibited the up-regulation of alpha1-adrenoreceptor and IP3 receptor. CONCLUSION The inhibition of the up-regulation of alpha1-adrenoreceptor and IP3 receptor by CNP might be one of the mechanisms of its suppressive action on intimal proliferation.
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MESH Headings
- Animals
- Aorta, Thoracic/injuries
- Calcium Channels/metabolism
- Catheterization/adverse effects
- Collagen/metabolism
- DNA/metabolism
- Elastin/metabolism
- Endothelium, Vascular/injuries
- Inositol 1,4,5-Trisphosphate/metabolism
- Inositol 1,4,5-Trisphosphate Receptors
- Male
- Muscle, Smooth, Vascular/metabolism
- Natriuretic Peptide, C-Type/pharmacology
- Rats
- Rats, Sprague-Dawley
- Receptors, Adrenergic, alpha-1/metabolism
- Receptors, Cytoplasmic and Nuclear/metabolism
- Sarcolemma/metabolism
- Sarcoplasmic Reticulum/metabolism
- Tunica Intima/growth & development
- Up-Regulation
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Affiliation(s)
- W Xiaohong
- Institute of Cardiovascular Research, the First Hospital, Beijing Medical University, Beijing 100034
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Célèrier E, Rivat C, Jun Y, Laulin JP, Larcher A, Reynier P, Simonnet G. Long-lasting hyperalgesia induced by fentanyl in rats: preventive effect of ketamine. Anesthesiology 2000; 92:465-72. [PMID: 10691234 DOI: 10.1097/00000542-200002000-00029] [Citation(s) in RCA: 363] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND It has been reported that mu-opioid receptor activation leads to a sustained increase in glutamate synaptic effectiveness at the N-methyl-D-aspartate (NMDA) receptor level, a system associated with central hypersensitivity to pain. One hypothesis is that postoperative pain may result partly from the activation of NMDA pain facilitatory processes induced by opiate treatment per se. The authors tested here the effectiveness of the opiate analgesic fentanyl for eliciting a delayed enhancement in pain sensitivity. METHODS The consequences of four bolus injections (every 15 min) of fentanyl (20-100 microg/kg per injection, subcutaneously) on immediate (for several hours) and long-term (for several days) sensitivity to nociceptive stimuli in the rat (paw-pressure vocalization test) were evaluated. The effects of the combination of the NMDA-receptor antagonist ketamine (10 mg/kg, subcutaneously) with fentanyl also were assessed. RESULTS Fentanyl administration exhibited a biphasic time-dependent effect: first, an early response (for 2-5 h) associated with a marked increase in nociceptive threshold (analgesia), and second, a later response associated with sustained lowering of the nociceptive threshold (5 days for the longest effect) below the basal value (30% of decrease for the maximal effect) indicative of hyperalgesia. The higher the fentanyl dose used, the more pronounced was the fentanyl-induced hyperalgesia. Ketamine pretreatment, which had no analgesic effect on its own, enhanced the earlier response (analgesia) and prevented the development of long-lasting hyperalgesia. CONCLUSIONS Fentanyl activates NMDA pain facilitatory processes, which oppose analgesia and lead to long-lasting enhancement in pain sensitivity.
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Affiliation(s)
- E Célèrier
- Institut National de la Santé et de la Recherche Médicale (INSERM) U 259, Bordeaux, France
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Jun Y, Kim E, Jin M, Sung HC, Han H, Geraghty DE, Ahn K. Human cytomegalovirus gene products US3 and US6 down-regulate trophoblast class I MHC molecules. J Immunol 2000; 164:805-11. [PMID: 10623826 DOI: 10.4049/jimmunol.164.2.805] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The epidemiological correlation between human CMV (HCMV) infection and spontaneous fetal loss has been suggested, but the underlying mechanism is not well understood. Fetal cytotrophoblasts, which are in direct contact with the maternal immune system in the uterus during pregnancy, do not express HLA-A and HLA-B, but express the nonclassical class I HLA-G and HLA-C. It has been shown that both HLA-G and HLA-C are capable of inhibiting NK-mediated cell lysis. In our present study, using human trophoblast cell lines as well as other cell lines stably transfected with the human class I genes, we have demonstrated that HCMV US3 and US6 down-regulate the cell-surface expression of both HLA-G and HLA-C by two different mechanisms. HCMV US3 physically associates with both trophoblast class I MHC species, retaining them in the endoplasmic reticulum. In contrast, HCMV US6 inhibits peptide transport by TAP and thus specifically the intracellular trafficking of class I molecules. Therefore, these findings suggest for the first time a possible molecular mechanism underlying HCMV-related spontaneous pregnancy loss.
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Affiliation(s)
- Y Jun
- Graduate School of Biotechnology, Korea University, Seoul, Korea
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Carrin G, Ron A, Hui Y, Hong W, Tuohong Z, Licheng Z, Shuo Z, Yide Y, Jiaying C, Qicheng J, Zhaoyang Z, Jun Y, Xuesheng L. The reform of the rural cooperative medical system in the People's Republic of China: interim experience in 14 pilot counties. Soc Sci Med 1999; 48:961-72. [PMID: 10192562] [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: 02/11/2023]
Abstract
During the 1960's and 1970's the Chinese government encouraged the 'rural cooperative medical systems' (RCMS), in order to ensure access to basic health care among the rural population. There was a break in the development of the RCMS in the early 1980's, as a consequence of market economic reforms. These reforms involved a shift from a communal to a household production system. As a result the collective way of financing rural health care was more or less abandoned. However, the government of the People's Republic of China was aware of the need to provide social protection against health care expenses. In March 1994 the government initiated a project to reestablish the RCMS. This project was implemented on a pilot basis in 14 counties of seven provinces. The reestablishment of the RCMS would be guided by the basic principles of health insurance. In October 1995, a first mid-term evaluation of the RCMS Project was held. One of the major research questions concerned the extent to which the RCMS had reduced the risk of paying health care bills that would otherwise be a burden on families. This article addresses this question and assesses the results obtained after two years of RCMS experimental work. A general finding is that the population structure by occupation and income varies, and that the RCMS has adapted itself to this variety. It is also confirmed that the burden of health care costs on families was reduced, more so in some counties than in others, but this reduction has been modest. The research results indicate that there is ample room for improvement. The outlook is hopeful, however. At the national level, there is now systematic thinking about RCMS. The current RCMS work is also having a considerable influence on other counties that are keen to reestablish the RCMS.
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Affiliation(s)
- G Carrin
- World Health Organization, Geneva, Switzerland
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Hesheng O, Jun Y, Ligia T, Yongzheng P, Chaoshu T, Jingyi S, Naikui L. Role of endogenous carbon monoxide in neointimal formation induced by balloon-injury in rat aorta. Chin Med Sci J 1999; 14:41-5. [PMID: 12899383] [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: 03/04/2023]
Abstract
OBJECTIVE The present study investigated the role of endogenous carbon monoxide (CO) in the pathogenesis of neointimal formation induced by balloon injury in rat. METHOD Endothelial denudation of the left common carotid artery of rat was carried out by three passages of a Fogarty 2F balloon catheter. DNA, collagen and elastin contents of each intima-media were estimated; and heme oxygenase (HO) activity and CO production in vascular smooth muscle cell (VSMC) were measured after administration of HO inhibitor. RESULT Our data showed that neointima occurred in the rat on day 7 and day 21 after balloon injury, and at the same time HO activity and CO production in VSMC were markedly increased. Administration of HO inhibitor, zinc deuteroporphyrin 2,4-bisglycol (ZnDPBG), could effectively inhibit HO activity and CO production, significantly enhance neointimal formation (aortic intima/media ratio were 21.4+/-1.8% vs 17.6+/-2.0%, P<0.05 on day 7; and 30.5+/-2.4% vs 23.0+/-2.2%, P<0.01 on day 21, respectively, compared with balloon alone group). CONCLUSION We concluded that 1) inhibition of CO production may enhance neointimal formation induced by endothelial denudation, implying endogenous CO play an protective role in response to vascular injury, and 2) induction of HO activity may be applied clinically for preventing restenosis after angioplasty.
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Affiliation(s)
- O Hesheng
- Institute of Cardiovascular Research, the First Clinical Hospital, Beijing Medical University, Beijing 100083
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Honma S, Jun Y, Horiguchi M. The human gemelli muscles and their nerve supplies. Kaibogaku Zasshi 1998; 73:329-35. [PMID: 9778919] [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: 02/09/2023]
Abstract
The superior and inferior gemellus muscles were examined as to their forms and the patterns of nerve supply in 13 human cadavers (20 specimens). The superior gemellus muscle (Gs) was absent in 3 specimens, but showed no accessory slip or fusion with the internal obturator muscle (Oi). The nerve to the Gs originated from the nerve to the Oi (OiN) in 7, the nerve to the quadratus femoris muscle (QfN) in 4, or both in 6 specimens. The inferior gemellus muscle (Gi) was present in all, but fused with the Oi in 3 specimens. In one specimen, an accessory muscle bundle was observed between the Gi and Oi. The Gi always received branches from the QfN at its anterior surface, but received an additional nerve supply at its posterior surface from the OiN or the pudendal nerve in one specimen each, and the accessory bundle was supplied by a branch from the OiN at its posterior surface. In a well preserved specimen, a branch to the Gi from the QfN entered the Oi and communicated with the OiN after supplying and leaving the Gi. The frequency of the dual innervation of Gs by the OiN and QfN was 29.3%, but that of the Gi and Oi could not be determined, because of the occurrence of the fused part, the accessory bundle and nerve communication. There existed some gross anatomical differences between both gemelli muscles; they are considered to be parts of the internal obturator muscle in a broad sense.
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Affiliation(s)
- S Honma
- Department of Anatomy, Iwate Medical University School of Medicine, Japan
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Ravindran K, Gómez LB, Li RR, Herbert ST, Lukens P, Jun Y, Elhamri S, Newrock RS, Mast DB. Frequency dependence of giant Shapiro steps in ordered and site-disordered proximity-coupled Josephson-junction arrays. Phys Rev B Condens Matter 1996; 53:5141-5144. [PMID: 9984111 DOI: 10.1103/physrevb.53.5141] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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