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Wang ZX, Mao YH, Wang Y, Fu PJ, Dang X, Xu LN. [Evaluation of anticoagulant effect and predicted dose of low molecular weight heparin in hemodialysis by anti-Ⅹa factor activity]. Zhonghua Yu Fang Yi Xue Za Zhi 2024; 58:254-260. [PMID: 38387959 DOI: 10.3760/cma.j.cn112150-20230803-00053] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/24/2024]
Abstract
The purpose of this study was to explore the reasonable dose of low molecular weight heparin (LMWH) in hemodialysis (HD) and the strategy of preventing extracorporeal circuit coagulation (ECC). A retrospective case-control study included patients who used LMWH for anticoagulation during maintenance hemodialysis (MHD) in the Hemodialysis Center of Beijing Hospital from December 2020 to January 2021. Basic data such as weight, height, basic kidney disease, dialysis age and anti-Ⅹa factor activity before, during and after dialysis were collected. A total of 46 patients were enrolled in this study, including 5 patients in coagulation group (10.9%) and 41 patients in non-coagulation group (89.1%). The anti-Ⅹa factor activity reached its peak at 0.5 h after the start of HD. The level of anti-Ⅹa factor was incorporated into the receiver operating characteristic curve (ROC curve). The results showed that the area under the ROC curve (AUC) was 0.802 (95% confidence interval: 0.651-0.54, P=0.029), and the cutoff was 0.31 IU/ml (sensitivity 1, specificity 0.683). It is suggested that the body surface area should be used as the basis to estimate the anticoagulant dose of LMWH in HD, and the activity of HD 4 h anti-Ⅹa factor ≤0.31 IU/ml, which is of diagnostic value for ECC. In addition, the results of binary logistic regression analysis showed that dialysis age was an independent risk factor for ECC (OR value 1.319, 95%CI 1.052-1.654, P=0.017). In summary, this study reveals that dialysis age may be a risk factor for ECC and that the activity of HD 4 h anti-Ⅹa factor ≤0.31 IU/ml can be used as a potential diagnostic cut-off point for ECC in HD patients, which provides a scientific basis for monitoring strategies to prevent blood coagulation in HD filters.
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Affiliation(s)
- Z X Wang
- Department of Nephrology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing 100005, China
| | - Y H Mao
- Department of Nephrology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing 100005, China
| | - Y Wang
- Department of Nephrology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing 100005, China
| | - P J Fu
- Department of Nephrology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing 100005, China
| | - X Dang
- Department of Nephrology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing 100005, China
| | - L N Xu
- Department of Nephrology, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing 100005, China
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Zhang M, Wang L, Tang W, Xing Y, Liu P, Dang X. Antibacterial mechanism of the novel antimicrobial peptide Jelleine-Ic and its efficacy in controlling Pseudomonas syringae pv. actinidiae in kiwifruit. Pest Manag Sci 2023; 79:3681-3692. [PMID: 37184207 DOI: 10.1002/ps.7548] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 05/11/2023] [Accepted: 05/15/2023] [Indexed: 05/16/2023]
Abstract
BACKGROUND Bacterial canker caused by Pseudomonas syringae pv. actinidiae (Psa) poses a severe threat to kiwifruit production. Because of the insufficient efficacy and environmental safety of available treatments, novel antibacterial agents should be urgently developed. Antimicrobial peptides (AMPs) can be used as antimicrobials for disease control. In this study, we designed a novel AMP, Jelleine-Ic, and evaluated its antibacterial activity and mechanism of action against Psa. RESULTS Jelleine-Ic with a half-maximal effective concentration of 1.67 μg/mL exhibited stronger antibacterial activity than did parent Jelleine-I. Jelleine-Ic targeted the Psa membrane, increased membrane permeabilization and dissipated membrane potential, resulting in calcium leakage. Electron microscopy revealed that Jelleine-Ic disrupted cell morphology and caused intracellular alterations. Moreover, this AMP penetrated the cell membrane, bound to DNA, and reduced the expression of genes related to DNA replication and repair. Jelleine-Ic also reduced esterase activity and induced intracellular reactive oxygen species generation. This peptide inhibited the development of Psa canker. The control efficiency of Jelleine-Ic against Psa in the leaf discs and leaves of kiwifruit was 81.83% and 70.53%, respectively, which was superior to that of the commercial agricultural streptomycin. Furthermore, Jelleine-Ic upregulated the expression of kiwifruit defense genes (PR-10 and WRKY70a). CONCLUSION Jelleine-Ic effectively controls Psa in vitro and in vivo, and may be developed as a bactericide for plant disease control. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Mingyu Zhang
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, China
| | - Lifang Wang
- School of Horticulture, Anhui Agricultural University, Hefei, China
| | - Wei Tang
- School of Horticulture, Anhui Agricultural University, Hefei, China
| | - Yue Xing
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, China
| | - Pu Liu
- School of Horticulture, Anhui Agricultural University, Hefei, China
| | - Xiangli Dang
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, China
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Shen P, Ding K, Wang L, Tian J, Huang X, Zhang M, Dang X. In vitro and in vivo antimicrobial activity of antimicrobial peptide Jelleine-I against foodborne pathogen Listeria monocytogenes. Int J Food Microbiol 2023; 387:110050. [PMID: 36508953 DOI: 10.1016/j.ijfoodmicro.2022.110050] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 11/25/2022] [Accepted: 12/01/2022] [Indexed: 12/12/2022]
Abstract
As a human foodborne pathogen, Listeria monocytogenes can cause severe human listeriosis and develop resistance to antibiotics. Antimicrobial peptides (AMPs) are produced from all kingdoms of life and regarded as promising alternatives to conventional antibiotics. Jelleine-I is an AMP identified from honeybees royal jelly. In this study, we explored the activity and action mechanism of Jelleine-I against L. monocytogenes. We found its minimum inhibitory concentration to be 12.5 μg/mL. Membrane permeability analysis revealed that Jelleine-I increased L. monocytogenes cell membrane permeability, causing calcium leakage. Scanning, transmission electron microscopy and fluorescence microscopy revealed that Jelleine-I destroyed membrane integrity, disrupted intracellular structures and interacted with the bacterial DNA. DNA binding analysis demonstrated that Jelleine-I bound to bacterial genomic DNA. Results of reverse transcription-quantitative PCR revealed that Jelleine-I affected bacterial DNA replication gene expression levels. Moreover, Jelleine-I induced cellular reactive oxygen species (ROS) production from fluorescence intensity analysis, and inhibited bacterial biofilm formation. Results of immunomodulation in Galleria mellonella revealed that Jelleine-I increased host hemocyte counts, upregulated host AMP gene (Gloverin and Cecropin D) expression, and inhibited proinfammatory cytokine (tumor necrosis factor α and interleukin 6) production induced by bacterial infection. It efficiently killed bacteria and increased the survival rate of infected insects to 70 %. Furthermore, Jelleine-I increased the G1 to S phase transition in mammalian cells from cells cycle analysis, and cytotoxicity assay results indicated that it promoted cell proliferation without hemolysis or cytotoxicity. Collectively, Jelleine-I possesses antimicrobial, immunomodulatory and cell proliferative activities, and is a promising candidate for preventing L. monocytogenes emergence and dissemination.
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Affiliation(s)
- Panpan Shen
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Kang Ding
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Lifang Wang
- School of Horticulture, Anhui Agricultural University, Hefei 230036, China
| | - Jinhuan Tian
- Department of Material Science and Engineering, College of Chemistry and Material, Jinan University, Guangzhou 510632, China
| | - Xiuhong Huang
- Department of Material Science and Engineering, College of Chemistry and Material, Jinan University, Guangzhou 510632, China
| | - Mingyu Zhang
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Xiangli Dang
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China.
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Li S, Hao Z, Xu H, Gao Y, Zhang M, Liang J, Dang X. Silencing β-1,3-glucan binding protein enhances the susceptibility of Plutella xylostella to entomopathogenic fungus Isaria cicadae. Pest Manag Sci 2022; 78:3117-3127. [PMID: 35442542 DOI: 10.1002/ps.6938] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 03/31/2022] [Accepted: 04/20/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND The diamondback moth, Plutella xylostella is a notorious pest of brassicaceae crops globally and has developed serious resistance to insecticide. Insects primarily rely on their innate immunity to defense against various pathogens. In this study, we investigated the immunological functions of a β-1,3-glucan binding protein from P. xylostella (PxβGBP) and evaluated its potential for biocontrolling P. xylostella. RESULTS The open reading frame of PxβGBP is 1422 bp encoding 473 amino acids residues. PxβGBP contained a CBM39 domain, a PAC domain and a GH16 domain and shared evolutionary conservation with other lepidoptera βGRPs. PxβGBP was strongly expressed in the third instar larvae and fat body. PxβGBP transcript levels increased significantly after the challenge with microbes, including Isaria cicadae, Escherichia coli and Staphylococcus aureus. PxβGBP was identified in P. xylostella larvae challenged by I cicadae, but not in the naïve insects. Recombinant PxβGBP can directly bind fungal and bacterial cells, and also agglutinate the cells of I cicadae, S. aureus and E coli in a zinc-dependent manner. Knockdown of PxβGBP via RNA interference significantly down-regulated the expression of antimicrobial peptide gene gloverin, and enhanced the susceptibility of P. xylostella to I. cicadae infection, leading to high mortality. CONCLUSION These results indicated that PxβGBP plays an important role in the immune response of P. xylostella against I. cicadae infection, and could serve as a potential novel target for pest control. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Shuangshuang Li
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, China
| | - Zhongping Hao
- Crop Research Institute, Anhui Academy of Agricultural Sciences, Hefei, China
| | - Huihui Xu
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, China
| | - Yan Gao
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou, China
| | - Mingyu Zhang
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, China
| | - Jian Liang
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, China
| | - Xiangli Dang
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei, China
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Ding K, Shen P, Xie Z, Wang L, Dang X. In vitro and in vivo antifungal activity of two peptides with the same composition and different distribution. Comp Biochem Physiol C Toxicol Pharmacol 2022; 252:109243. [PMID: 34768011 DOI: 10.1016/j.cbpc.2021.109243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 11/01/2021] [Accepted: 11/07/2021] [Indexed: 11/20/2022]
Abstract
Candida albicans can cause local or systemic diseases when host immune status is disrupted. Drug resistance to C. albicans highlights the necessity of novel antifungal drugs. Antimicrobial peptides exhibit potential as antifungal drugs. PAF26 was found to exhibit favorable activity against plant pathogenic fungi. However, it showed low antifungal activity against C. albicans. Here, P255 and P256 with the same composition and different distribution were derived from PAF26. P256 exhibited higher antifungal activity against C. albicans than did P255 and PAF26. P256 and P255 exhibited synergism when combined with amphotericin B (AMB). Both peptides reduced cell wall integrity, rapidly increased membrane permeability, disrupted cell morphology and intracellular alterations. The peptides affected the expression of fungal DNA replication and repair, cell wall synthesis and ergosterol synthesis genes. They increased cellular reactive oxygen species production and bound with fungal genomic DNA. Antibiofilm activities were observed when peptide alone or combined with AMB. Finally, these peptides protected 70% of Galleria mellonella from infection-caused death. Insects treated with peptides exhibited fewer infection foci compared with the untreatment. These results demonstrate the therapeutic potential of the peptides, particularly P256 with clear amphipathicity, in the development of therapies for C. albicans infections.
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Affiliation(s)
- Kang Ding
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Panpan Shen
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Zhongwen Xie
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, China.
| | - Lifang Wang
- School of Horticulture, Anhui Agricultural University, Hefei 230036, China
| | - Xiangli Dang
- Anhui Province Key Laboratory of Integrated Pest Management on Crops, School of Plant Protection, Anhui Agricultural University, Hefei 230036, China.
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Dang X, Wang G. Spotlight on the Selected New Antimicrobial Innate Immune Peptides Discovered During 2015-2019. Curr Top Med Chem 2021; 20:2984-2998. [PMID: 33092508 DOI: 10.2174/1568026620666201022143625] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 11/27/2019] [Revised: 02/25/2020] [Accepted: 02/27/2020] [Indexed: 12/16/2022]
Abstract
BACKGROUND Antibiotic resistance is a global issue and new anti-microbials are required. INTRODUCTION Anti-microbial peptides are important players of host innate immune systems that prevent infections. Due to their ability to eliminate drug-resistant pathogens, AMPs are promising candidates for developing the next generation of anti-microbials. METHODS The anti-microbial peptide database provides a useful tool for searching, predicting, and designing new AMPs. In the period from 2015-2019, ~500 new natural peptides have been registered. RESULTS This article highlights a selected set of new AMP members with interesting properties. Teixobactin is a cell wall inhibiting peptide antibiotic, while darobactin inhibits a chaperone and translocator for outer membrane proteins. Remarkably, cOB1, a sex pheromone from commensal enterococci, restricts the growth of multidrug-resistant Enterococcus faecalis in the gut at a picomolar concentration. A novel proline-rich AMP has been found in the plant Brassica napus. A shrimp peptide MjPen- II comprises three different sequence domains: serine-rich, proline-rich, and cysteine-rich regions. Surprisingly, an amphibian peptide urumin specifically inhibits H1 hemagglutinin-bearing influenza A virus. Defensins are abundant and typically consist of three pairs of intramolecular disulfide bonds. However, rat rattusin dimerizes via forming five pairs of intermolecular disulfide bonds. While human LL-37 can be induced by vitamin D, vitamin A induces the expression of resistin-like molecule alpha (RELMα) in mice. The isolation and characterization of an alternative human cathelicidin peptide, TLN-58, substantiates the concept of one gene multiple peptides. The involvement of a fly AMP nemuri in sleep induction may promote the research on the relationship between sleep and infection control. CONCLUSION The functional roles of AMPs continue to grow and the general term "innate immune peptides" becomes useful. These discoveries widen our view on the anti-microbial peptides and may open new opportunities for developing novel peptide therapeutics for different applications.
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Affiliation(s)
- Xiangli Dang
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, NE 68198-5900, United States
| | - Guangshun Wang
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, NE 68198-5900, United States
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Song J, Wu J, Poulet B, Liang J, Bai C, Dang X, Wang K, Fan L, Liu R. Proteomics analysis of hip articular cartilage identifies differentially expressed proteins associated with osteonecrosis of the femoral head. Osteoarthritis Cartilage 2021; 29:1081-1092. [PMID: 33892138 DOI: 10.1016/j.joca.2021.04.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 03/16/2021] [Accepted: 04/12/2021] [Indexed: 02/06/2023]
Abstract
OBJECTIVE The cartilage degeneration that accompanies subchondral bone necrosis plays an important role in the development of osteonecrosis of femoral head (ONFH). To better understand the molecular basis of cartilage degradation in ONFH, we compared the proteomic profiles of ONFH cartilage with that of fracture control. DESIGN Hip cartilage samples were collected from 16 ONFH patients and 16 matched controls with femoral neck fracture. Proteomics analysis was conducted using tandem mass tag-based quantitation technique. Gene ontology (GO) analysis, KEGG pathway and protein-protein interaction analysis were used to investigate the functions of the altered proteins and biological pathways. Differentially expressed proteins including alpha-2-HS-glycoprotein (AHSG) and Cytokine-like protein 1 (Cytl1) were validated by Western blot (WB) and immunohistochemistry (IHC). RESULTS 303 differentially expressed proteins were identified in ONFH cartilage with 72 up-regulated and 231 down-regulated. Collagen turnover, glycosaminoglycan biosynthesis, metabolic pathways, and complement and coagulation cascades were significantly modified in ONFH cartilage. WB and IHC confirmed the increased expression of AHSG and decreased expression of Cytl1 in ONFH cartilage. CONCLUSIONS Our results reveal the implication of altered protein expression in the development of ONFH, and provide novel clues for pathogenesis studies of cartilage degradation in ONFH.
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Affiliation(s)
- J Song
- Department of Orthopaedics, The Second Affiliated Hospital, Xi'an Jiaotong University, NO.157, Xiwu Road, Xi'an, Shaanxi, 710004, PR China.
| | - J Wu
- Department of Orthopaedics, The Second Affiliated Hospital, Xi'an Jiaotong University, NO.157, Xiwu Road, Xi'an, Shaanxi, 710004, PR China; Department of Orthopaedics, Luoyang Central Hospital Affiliated to Zhengzhou University, Luoyang, Henan Province, 471009, PR China.
| | - B Poulet
- Institute of Ageing and Chronic Disease, University of Liverpool, William Henry Duncan Building, West Derby Road, Liverpool, L7 8TX, UK.
| | - J Liang
- Department of Orthopaedics, The Second Affiliated Hospital, Xi'an Jiaotong University, NO.157, Xiwu Road, Xi'an, Shaanxi, 710004, PR China.
| | - C Bai
- Department of Orthopaedics, The Second Affiliated Hospital, Xi'an Jiaotong University, NO.157, Xiwu Road, Xi'an, Shaanxi, 710004, PR China.
| | - X Dang
- Department of Orthopaedics, The Second Affiliated Hospital, Xi'an Jiaotong University, NO.157, Xiwu Road, Xi'an, Shaanxi, 710004, PR China.
| | - K Wang
- Department of Orthopaedics, The Second Affiliated Hospital, Xi'an Jiaotong University, NO.157, Xiwu Road, Xi'an, Shaanxi, 710004, PR China.
| | - L Fan
- Department of Orthopaedics, The Second Affiliated Hospital, Xi'an Jiaotong University, NO.157, Xiwu Road, Xi'an, Shaanxi, 710004, PR China.
| | - R Liu
- Department of Orthopaedics, The Second Affiliated Hospital, Xi'an Jiaotong University, NO.157, Xiwu Road, Xi'an, Shaanxi, 710004, PR China; Institute of Ageing and Chronic Disease, University of Liverpool, William Henry Duncan Building, West Derby Road, Liverpool, L7 8TX, UK.
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Golla RM, Mishra B, Dang X, Lakshmaiah Narayana J, Li A, Xu L, Wang G. Resistome of Staphylococcus aureus in Response to Human Cathelicidin LL-37 and Its Engineered Antimicrobial Peptides. ACS Infect Dis 2020; 6:1866-1881. [PMID: 32343547 DOI: 10.1021/acsinfecdis.0c00112] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Staphylococcus aureus is notoriously known for its rapid development of resistance to conventional antibiotics. S. aureus can alter its membrane composition to reduce the killing effect of antibiotics and antimicrobial peptides (AMPs). To obtain a more complete picture, this study identified the resistance genes of S. aureus in response to human cathelicidin LL-37 peptides by screening the Nebraska Transposon Mutant Library. In total, 24 resistant genes were identified. Among them, six mutants, including the one with the known membrane-modifying gene (mprF) disabled, became more membrane permeable to the LL-37 engineered peptide 17BIPHE2 than the wild type. Mass spectrometry analysis detected minimal lysyl-phosphatidylglycerol (lysylPG) from the mprF mutant of S. aureus JE2, confirming loss-of-function of this gene. Moreover, multiple mutants showed reduced surface adhesion and biofilm formation. In addition, four S. aureus mutants were unable to infect wax moth Galleria mellonella. There appears to be a connection between the ability of bacterial attachment/biofilm formation and infection. These results underscore the multiple functional roles of the identified peptide-response genes in bacterial growth, infection, and biofilm formation. Therefore, S. aureus utilizes a set of resistant genes to weave a complex molecular network to handle the danger posed by cationic LL-37. It appears that different genes are involved depending on the nature of antimicrobials. These resistant genes may offer a novel avenue to designing more potent antibiotics that target the Achilles heels of S. aureus USA300, a community-associated pathogen of great threat.
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Affiliation(s)
- Radha M. Golla
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
| | - Biswajit Mishra
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
| | - Xiangli Dang
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
| | - Jayaram Lakshmaiah Narayana
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
| | - Amy Li
- Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Libin Xu
- Department of Medicinal Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Guangshun Wang
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, Nebraska 68198-5900, United States
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Guo H, Wang P, Chang J, Yin Q, Liu C, Li M, Dang X, Lu F. Effect of processed maize stover as an alternative energy source in swine production. J Anim Feed Sci 2020. [DOI: 10.22358/jafs/124044/2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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10
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Bozelli JC, Yune J, Dang X, Narayana JL, Wang G, Epand RM. Membrane activity of two short Trp-rich amphipathic peptides. Biochim Biophys Acta Biomembr 2020; 1862:183280. [PMID: 32220553 DOI: 10.1016/j.bbamem.2020.183280] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Revised: 03/09/2020] [Accepted: 03/18/2020] [Indexed: 12/13/2022]
Abstract
Short linear antimicrobial peptides are attractive templates for developing new antibiotics. Here, it is described a study of the interaction between two short Trp-rich peptides, horine and verine-L, and model membranes. Isothermal titration calorimetry studies showed that the affinity of these peptides towards large unilamellar vesicles (LUV) having a lipid composition mimicking the lipid composition of S. aureus membranes is ca. 30-fold higher than that towards E. coli mimetics. The former interaction is driven by enthalpy and entropy, while the latter case is driven by entropy, suggesting differences in the forces that play a role in the binding to the two types of model membranes. Upon membrane binding the peptides acquired different conformations according to circular dichroism (CD) studies; however, in both cases CD studies indicated stacked W-residues. Peptide-induced membrane permeabilization, lipid flip-flop, molecular packing at the membrane-water interface, and lateral lipid segregation were observed in all cases. However, the extent of these peptide-induced changes on membrane properties was always higher in S. aureus than E. coli mimetics. Both peptides seem to act via a similar mechanism of membrane permeabilization of S. aureus membrane mimetics, while their mechanisms seem to differ in the case of E. coli. This may be the result of differences in both the peptides´ structure and the membrane lipid composition between both types of bacteria.
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Affiliation(s)
- José C Bozelli
- Department of Biochemistry and Biomedical Sciences, McMaster University, Health Sciences Centre, Hamilton, ON L8S 4K1, Canada
| | - Jenny Yune
- Department of Biochemistry and Biomedical Sciences, McMaster University, Health Sciences Centre, Hamilton, ON L8S 4K1, Canada
| | - Xiangli Dang
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, NE 68198-5990, USA
| | - Jayaram Lakshmaiah Narayana
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, NE 68198-5990, USA
| | - Guangshun Wang
- Department of Pathology and Microbiology, College of Medicine, University of Nebraska Medical Center, 985900 Nebraska Medical Center, Omaha, NE 68198-5990, USA
| | - Richard M Epand
- Department of Biochemistry and Biomedical Sciences, McMaster University, Health Sciences Centre, Hamilton, ON L8S 4K1, Canada.
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Peng Y, Wang L, Gao Y, Ye L, Xu H, Li S, Jiang J, Li G, Dang X. Identification and characterization of the glycoside hydrolase family 18 genes from the entomopathogenic fungus Isaria cicadae genome. Can J Microbiol 2020; 66:274-287. [PMID: 31961710 DOI: 10.1139/cjm-2019-0129] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Fungal chitinases play essential roles in chitin degradation, cell wall remodeling, chitin recycling, nutrition acquisition, autolysis, and virulence. In this study, 18 genes of the glycoside hydrolase 18 (GH18) family were identified in the Isaria cicadae genome. Seventeen of the genes belonged to chitinases and one was an endo-β-N-acetylglucosaminidase (ENGase). According to phylogenetic analysis, the 17 chitinases were designated as subgroups A (7 chitinases), B (7), and C (3). The exon-intron organizations of these genes were analyzed. The conserved regions DxxDxDxE and S/AxGG and the domains CBM1, CBM18, and CBM50 were detected in I. cicadae chitinases and ENGase. The results of analysis of expression patterns showed that genes ICchiA1, ICchiA6, ICchiB1, and ICchiB4 had high transcript levels in the different growth conditions or developmental stages. Subgroup A chitinase genes had higher transcript levels than the genes of all other chitinases. Subgroup B chitinase genes (except ICchiB7) presented higher transcript levels in chitin medium compared with other conditions. ICchiC2 and ICchiC3 were mainly transcribed in autolysis medium and in blastospores, respectively. Moreover, ICchiB1 presented higher transcript levels than genes of other chitinases. This work provides an overview of the GH18 chitinases and ENGase in I. cicadae and provides a context for the chitinolytic potential, functions, and biological controls of these enzymes of entomopathogenic fungi.
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Affiliation(s)
- Yao Peng
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, P.R. China
| | - Lifang Wang
- School of Horticulture, Anhui Agricultural University, Hefei 230036, P.R. China
| | - Yan Gao
- Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, P.R. China
| | - Liang Ye
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, P.R. China
| | - Huihui Xu
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, P.R. China
| | - Shuangjiao Li
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, P.R. China
| | - Junqi Jiang
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, P.R. China
| | - Guiting Li
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, P.R. China
| | - Xiangli Dang
- School of Plant Protection, Anhui Agricultural University, Hefei 230036, P.R. China
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12
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Dang X, Zheng X, Wang Y, Wang L, Ye L, Jiang J. Antimicrobial peptides from the edible insect
Musca domestica
and their preservation effect on chilled pork. J FOOD PROCESS PRES 2019. [DOI: 10.1111/jfpp.14369] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Xiangli Dang
- School of Plant Protection Anhui Agricultural University Hefei China
- State Key Laboratory of Biocontrol School of Life Sciences Sun Yat‐sen University Guangzhou China
| | - Xiaoxia Zheng
- State Key Laboratory of Biocontrol School of Life Sciences Sun Yat‐sen University Guangzhou China
| | - Yansheng Wang
- State Key Laboratory of Biocontrol School of Life Sciences Sun Yat‐sen University Guangzhou China
| | - Lifang Wang
- School of Horticulture Anhui Agricultural University Hefei China
| | - Liang Ye
- School of Plant Protection Anhui Agricultural University Hefei China
| | - Junqi Jiang
- School of Plant Protection Anhui Agricultural University Hefei China
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13
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Xi L, Liu D, Ma L, Zhang Y, Sheng R, Zhang S, Dang X, Li G, Miao Y, Jiang J. Expression Patterns, Molecular Characterization, and Response to Host Stress of CYP Genes from Phenacoccus solenopsis (Hemiptera: Pseudococcidae). Insects 2019; 10:E264. [PMID: 31443456 PMCID: PMC6780606 DOI: 10.3390/insects10090264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 07/30/2019] [Accepted: 08/19/2019] [Indexed: 11/16/2022]
Abstract
The quarantine insect pest Phenacoccus solenopsis (Hemiptera: Pseudococcidae) has a broad host range and is distributed worldwide. Each year, P. solenopsis causes significant crop losses. The detoxification of various xenobiotic compounds involves the cytochrome P450 monooxygenase (CYP) superfamily of enzymes. However, the functions of CYPs in P. solenopsis are poorly understood. In the present study, P. solenopsis was reared from the egg to the adult stage on three host plants: Tomato, cotton, and hibiscus. Thirty-seven P. solenopsis CYP genes were identified and their phylogenetic relationships were analyzed. Eleven CYP genes (PsCYP4NT1, PsCYP4G219, PsCYP6PZ1, PsCYP6PZ5, PsCYP301B1, PsCYP302A1, PsCYP305A22, PsCYP315A1, PsCYP353F1, PsCYP3634A1, and PsCYP3635A2) were selected for quantitative real-time PCR analysis. The results demonstrated marked differences in CYP expression levels in P. solenopsis grown on different host plants. The results will aid the molecular characterization of CYPs and will increase our understanding of CYP expression patterns in P. solenopsis during development and growth on different hosts.
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Affiliation(s)
- Lingyu Xi
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Dan Liu
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Lei Ma
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Ying Zhang
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Ruirui Sheng
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Shaobing Zhang
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Xiangli Dang
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Guiting Li
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Yong Miao
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China
| | - Junqi Jiang
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei 230036, China.
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14
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Dorschner R, Dang X, Eliceiri B, Baird A. 978 CD44 expression on leukocytes is dynamically regulated by ECRG4. J Invest Dermatol 2019. [DOI: 10.1016/j.jid.2019.03.1054] [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: 11/25/2022]
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15
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Liu D, Dang X, Song W, Xi L, Wang Q, Zhang S, Miao Y, Li G, Jiang J. Molecular characterization and expression patterns of Phenacoccus solenopsis (Hemiptera: Pseudococcidae) heat shock protein genes and their response to host stress. Arch Insect Biochem Physiol 2019; 100:e21536. [PMID: 30659637 DOI: 10.1002/arch.21536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 01/01/2019] [Accepted: 01/02/2019] [Indexed: 06/09/2023]
Abstract
As a polyphagous insect, little is known at the molecular level about the effects of different host plants on physiological changes in Phenacoccus solenopsis. In this study, four heat shock protein (Hsp) genes (PsHsp60, PsHsp70, PsHsp90, and PsHsp20.7) were identified from the transcriptome of P. solenopsis. Analysis of Hsp expression levels revealed significant differences in Hsp gene expression levels in P. solenopsis fed on different host plants. In host conversion tests, the expression levels of PsHsp90 and PsHsp60 were upregulated after transfer of second instar nymphs from tomato to cotton. The expression levels of PsHsp70 and PsHsp20.7 were, respectively, significantly upregulated at 9 and 48 hr after transfer from tomato to Hibiscus. The results of this study aid molecular characterization and understanding of the expression patterns of Hsp genes during different developmental stages and host transfer of P. solenopsis.
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Affiliation(s)
- Dan Liu
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei, Anhui, China
| | - Xiangli Dang
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei, Anhui, China
| | - Wei Song
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei, Anhui, China
| | - Lingyu Xi
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei, Anhui, China
| | - Qi Wang
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei, Anhui, China
| | - Shaobing Zhang
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei, Anhui, China
| | - Yong Miao
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei, Anhui, China
| | - Guiting Li
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei, Anhui, China
| | - Junqi Jiang
- Department of Entomology, College of Plant Protection, Anhui Agricultural University, Hefei, Anhui, China
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16
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Wang W, Qu X, Dang X, Shang D, Yang L, Li Y, Xu D, Martin JG, Hamid Q, Liu J, Chang Y. Human β-defensin-3 induces IL-8 release and apoptosis in airway smooth muscle cells. Clin Exp Allergy 2017; 47:1138-1149. [PMID: 28437599 DOI: 10.1111/cea.12943] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 04/12/2017] [Accepted: 04/14/2017] [Indexed: 12/23/2022]
Abstract
BACKGROUND Human airway smooth muscle cells (ASMCs) may have a pro-inflammatory role through the release of inflammatory mediators. Increasing evidence indicates that human β-defensins (HBDs) are related to pathogenesis of asthma. OBJECTIVES To examine the plasma level of HBD-1, HBD-2 and HBD-3 in asthmatic patients and the expression of their mouse orthologues in the lung tissue of a mouse model of chronic severe asthma. Further to investigate the effect of HBD-3 on the release of the pro-inflammatory cytokine IL-8 and to explore the mechanisms. METHODS The plasma levels of HBD-1, HBD-2 and HBD-3 from 34 healthy controls and 25 asthmatic patients were determined by ELISA. The expression of mouse β-defensins MBD-1, MBD-3 and MBD-14 in the lung tissue of asthmatic mice was detected by Western blot. The ASMCs were cultured with HBD-3 for 24 hour, and then the supernatant level of IL-8 was evaluated by ELISA and the cell viability was examined by WST-1 assay. The signalling pathway was investigated with blocking antibodies or pharmacological inhibitors. RESULTS The plasma levels of HBD-1 and HBD-3 were elevated in asthmatic patients, and the expression of MBD-14, the mouse orthologue for HBD-3, was increased in asthmatic mice. HBD-3-induced IL-8 production in a CCR6 receptor-specific manner and was dependent on multiple signalling pathways. Moreover, HBD-3-induced cell apoptosis concurrently, which was dependent on the ERK1/2 MAPK pathway. Mitochondrial ROS regulated both HBD-3-induced IL-8 production and cell apoptosis. CONCLUSIONS AND CLINICAL RELEVANCE These observations provide clear evidence of an important new mechanism for the promotion of airway inflammation and tissue remodelling with potential relevance for the treatment of asthma.
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Affiliation(s)
- W Wang
- Center for Translational Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - X Qu
- Center for Translational Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - X Dang
- Department of Respiration, The First Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - D Shang
- Department of Respiration, The First Affiliated Hospital, Xi'an Jiaotong University, Xi'an, China
| | - L Yang
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - Y Li
- Center for Translational Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - D Xu
- Center for Translational Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - J G Martin
- Meakins-Christie Laboratories and Respiratory Division, The Research Institute of the McGill University Health Centre and Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Q Hamid
- Meakins-Christie Laboratories and Respiratory Division, The Research Institute of the McGill University Health Centre and Department of Medicine, McGill University, Montreal, Quebec, Canada.,College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - J Liu
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China
| | - Y Chang
- Center for Translational Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology and Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an, China
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17
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Abstract
Topological insulators are very interesting from a fundamental point of view, and their unique properties may be useful for electronic and spintronic device applications. From the point of view of applications it is important to understand the decay behavior of carriers injected in the band gap of the topological insulator, which is determined by its complex band structure (CBS). Using first-principles calculations, we investigate the dispersion and symmetry of the complex bands of Bi2Se3 family of three-dimensional topological insulators. We compare the CBS of a band insulator and a topological insulator and follow the CBS evolution in both when the spin-orbit interaction is turned on. We find significant differences in the CBS linked to the topological band structure. In particular, our results demonstrate that the evanescent states in Bi2Se3 are non-trivially complex, i.e. contain both the real and imaginary contributions. This explains quantitatively the oscillatory behavior of the band gap obtained from Bi2Se3 (0 0 0 1) slab calculations.
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Affiliation(s)
- J Betancourt
- Department of Physics and Astronomy, University of Puerto Rico, San Juan, PR 00931, USA
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18
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Wang P, Fan C, Chang J, Yin Q, Song A, Dang X, Lu F. Study on effects of microbial fermented soyabean meal on production performances of sows and suckling piglets and its acting mechanism. J Anim Feed Sci 2016. [DOI: 10.22358/jafs/65582/2016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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Tian J, Shen S, Zhou C, Dang X, Jiao Y, Li L, Ding S, Li H. Investigation of the antimicrobial activity and biocompatibility of magnesium alloy coated with HA and antimicrobial peptide. J Mater Sci Mater Med 2015; 26:66. [PMID: 25631264 DOI: 10.1007/s10856-015-5389-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 09/26/2014] [Indexed: 06/04/2023]
Abstract
Implant-associated infection is one of the biggest problems in orthopedic surgery. Antimicrobial peptides (AMPs) are well-known components of the innate immunity and less susceptible to the development of pathogen resistance compared to conventional antibiotics. Magnesium alloys as potential biodegradable bone implants have been received much attention in biomaterials field. This study investigated the deposition of calcium phosphate (CaP) coatings and loading of AMPs on the magnesium alloy surface by a biomimetic method. Scanning electron microscope (SEM) results presented that a microporous and plate-like CaP coating was processed on the magnesium alloy surface. X-ray diffractometry (XRD) and Fourier transform infrared spectroscopy (FTIR) analysis showed the main component of coating was hydroxyapatite (HA). Degradation assay in vitro showed that the HA coating deposited onto the magnesium alloy was corroded more slowly than the bare one. The amount of AMP loaded in the HA coating was 11.16±1.99 μg/cm2. The AMP loaded onto HA coatings had slow release for 7 days. The AMP-loaded coating showed antimicrobial activity against Staphylococcus aureus. Its bacterial inhibition rate exceeded 50% after 4 days and the antibacterial effect was sustained for 7 days. The coated magnesium alloys loaded with AMP could improve rat bone marrow mesenchymal stem cells (rBMMSCs) proliferation. Furthermore, it could also promote alkaline phosphatase (ALP) activity of rBMMSCs. Both radiographic evaluation and histopathology analysis demonstrated that implantation of the coated magnesium alloy into the rabbit femoral condyle had promoted bone repair and showed anti-inflammatory effect. The results showed that the AMP loaded onto HA coatings on the magnesium alloy surface could be considered an ideal orthopedic implant against S. aureus infection.
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Affiliation(s)
- Jinhuan Tian
- Department of Materials Science and Engineering, Jinan University, Guangzhou, 510630, China
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20
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Barish M, Weng L, D'Apuzzo M, Forman S, Brown C, Ben Horin I, Volovitz I, Ram Z, Chang A, Wainwright D, Dey M, Han Y, Lesniak M, Chow K, Yi J, Shaffer D, Gottschalk S, Clark A, Safaee M, Oh T, Ivan M, Kaur R, Sun M, Lu YJ, Ozawa T, James CD, Bloch O, Parsa A, Debinski W, Choi YA, Gibo DM, Dey M, Wainwright D, Chang A, Han Y, Lesniak M, Herold-Mende C, Mossemann J, Jungk C, Ahmadi R, Capper D, von Deimling A, Unterberg A, Beckhove P, Jiang H, Klein SR, Piya S, Vence L, Yung WKA, Sawaya R, Heimberger A, Conrad C, Lang F, Gomez-Manzano C, Fueyo J, Jung TY, Choi YD, Kim YH, Lee JJ, Kim HS, Kim JS, Kim SK, Jung S, Cho D, Kosaka A, Ohkuri T, Okada H, Erickson K, Malone C, Ha E, Soto H, Hickey M, Owens G, Liau L, Prins R, Minev B, Kruse C, Lee J, Dang X, Borboa A, Coimbra R, Baird A, Eliceiri B, Mathios D, Lim M, Ruzevick J, Nicholas S, Polanczyk M, Jackson C, Taube J, Burger P, Martin A, Xu H, Ochs K, Sahm F, Opitz CA, Lanz TV, Oezen I, Couraud PO, von Deimling A, Wick W, Platten M, Ohkuri T, Ghosh A, Kosaka A, Zhu J, Ikeura M, Watkins S, Sarkar S, Okada H, Pellegatta S, Pessina S, Cantini G, Kapetis D, Finocchiaro G, Avril T, Vauleon E, Hamlat A, Mosser J, Quillien V, Raychaudhuri B, Rayman P, Huang P, Grabowski M, Hamburdzumyan D, Finke J, Vogelbaum M, Renner D, Litterman A, Balgeman A, Jin F, Hanson L, Gamez J, Carlson B, Sarkaria J, Parney I, Ohlfest J, Pirko I, Pavelko K, Johnson A, Sims J, Grinshpun B, Feng Y, Amendolara B, Shen Y, Canoll P, Sims P, Bruce J, Lee SX, Wong E, Swanson K, Wainwright D, Chang A, Dey M, Balyasnikova I, Cheng Y, Han Y, Lesniak M, Wang F, Wei J, Xu S, Ling X, Yaghi N, Kong LY, Doucette T, Weinberg J, DeMonte F, Lang F, Prabhu S, Heimberger A, Wiencke J, Accomando W, Houseman EA, Nelson H, Wrensch M, Wiemels J, Zheng S, Hsuang G, Bracci P, Kelsey K. IMMUNOLOGY RESEARCH. Neuro Oncol 2013. [DOI: 10.1093/neuonc/not177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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21
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Wang J, Wang Y, Dang X, Zheng X, Zhang W. Housefly larvae hydrolysate: orthogonal optimization of hydrolysis, antioxidant activity, amino acid composition and functional properties. BMC Res Notes 2013; 6:197. [PMID: 23683361 PMCID: PMC3662629 DOI: 10.1186/1756-0500-6-197] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 05/14/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Antioxidant, one of the most important food additives, is widely used in food industry. At present, antioxidant is mostly produced by chemical synthesis, which would accumulate to be pathogenic. Therefore, a great interest has been developed to identify and use natural antioxidants. It was showed that there are a lot of antioxidative peptides in protein hydrolysates, possessing strong capacity of inhibiting peroxidation of macro-biomolecular and scavenging free redicals in vivo. Enzymatic hydrolysis used for preparation of antioxidative peptides is a new hot-spot in the field of natural antioxidants. It reacts under mild conditions, with accurate site-specific degradation, good repeatability and few damages to biological activity of protein. Substrates for enzymatic hydrolysis are usually plants and aqua-animals. Insects are also gaining attention because of their rich protein and resource. Antioxidative peptides are potential to be exploited as new natural antioxidant and functional food. There is a huge potential market in medical and cosmetic field as well. RESULT Protein hydrolysate with antioxidant activity was prepared from housefly larvae, by a two-step hydrolysis. Through orthogonal optimization of the hydrolysis conditions, the degree of hydrolysis was determined to be approximately 60%. Fractionated hydrolysate at 25 mg/mL, 2.5 mg/mL and 1 mg/mL exhibited approximately 50%, 60% and 50% of scavenging capacity on superoxide radicals, 1, 1-Diphenyl-2-picrylhydrazyl radicals and hydroxyl radicals, respectively. Hydrolysate did not exhibit substantial ion chelation. Using a linoneic peroxidation system, the inhibition activity of hydrolysate at 20 mg/mL was close to that of 20 μg/mL tertiary butylhydroquinone, suggesting a potential application of hydrolysate in the oil industry as an efficient antioxidant. The lyophilized hydrolysate presented almost 100% solubility at pH 3-pH 9, and maintained nearly 100% activity at pH 5-pH 8 at 0°C- 4°C and room temperature during the first 6 months of storage. Essential amino acids in the hydrolysate accounted for 43% of the total amino acids. CONCLUSIONS The results suggesting that hydrolysate could be added to food oils as an efficient antioxidant. It might be useful for food additives, diet nutrients and pharmaceutical agents.
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Affiliation(s)
- Juan Wang
- State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
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22
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23
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Kardami E, Banerji S, Doble BW, Dang X, Fandrich RR, Jin Y, Cattini PA. PKC-Dependent Phosphorylation May Regulate the Ability of Connexin43 to Inhibit DNA Synthesis. ACTA ACUST UNITED AC 2009; 10:293-7. [PMID: 14681031 DOI: 10.1080/cac.10.4-6.293.297] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [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: 10/20/2022]
Abstract
Phosphorylation affects several biological functions of connexin43 (Cx43), although its role on Cx43-mediated inhibition of DNA synthesis is not known. Previous studies showed increased Cx43 phosphorylation on serine in response to growth factor stimulation of cardiomyocytes, mediated by protein kinase C-epsilon (PKCepsilon). Here we report that activation of PKCepsilon is also necessary for stimulation of cardiomyocyte DNA synthesis and mitosis. We have investigated the participation of specific serine residues that are putative PKC targets in producing phosphorylated Cx43 species and also in regulating DNA synthesis in cardiomyocytes. Interference with the PKC signaling system and/or the phosphorylation of specific amino-acids of Cx43 may allow regulation of the mitogenic response.
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Affiliation(s)
- E Kardami
- Institute of Cardiovascular Sciences and Departments of Anatomy and Physiology, University of Manitoba, Winnipeg, Manitoba, Canada.
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25
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Dang X, Yi Z, Wang X, Wu X, Zhang X, He Q. [Preventive efficiency of IVIgG on nosocomial infection in the children with nephrotic syndrome]. Hunan Yi Ke Da Xue Xue Bao 2002; 24:290-2. [PMID: 12016811] [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: 02/25/2023]
Abstract
In order to study the preventive efficiency of IVIgG on nosocomial infection(NI), 54 cases of the children with nephrotic syndrome(NS) were randomly divided into 2 groups, test group(n = 22) and control group(n = 32). Routine treatment was adopted to all cases. Besides the routine treatment, the test group was injected with IVIgG(100-300 mg.kg-1.d-1) for 2-3 days. The results showed that the NI rate of test group (13.6%) was significantly lower than that of the control(46.88%) (P < 0.05), and the hospital days of the test group(27.33 +/- 15.51) d was significantly shorter than that of the control(64.50 +/- 18.52) d (P < 0.05). These suggest that IVIgG, as one of the ways to prevent NI, can improve the immune state and effectively prevent the NI in the children with NS.
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Affiliation(s)
- X Dang
- Department of Pediatrics, Second Affiliated Hospital, Hunan Medical University, Changsha 410011
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26
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Qian B, Sun Y, Guo Y, Dang X, Ru B. A prourokinase-RGDS chimera : Construction, expression and characterization. Sci China C Life Sci 1999; 42:259-266. [PMID: 20229339 DOI: 10.1007/bf03183601] [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: 10/11/1998] [Indexed: 05/28/2023]
Abstract
A tetrapeptide, RGDS, was inserted into proUK kringle domain G118-L119 by the construction of a mutant proUK-RGDS gene. The gene was expressed in the baculovirus expression system. Immunoaffinity chromatography was used to purify the chimera and protein with purity over 90% was achieved. The chimera was tested for its platelet membrane binding function and showed a calcium-dependent platelet binding activity. Amidolytic activity of the chimera was tested. The result indicated that specific amidolytic activity of plasmin activated chimera was 62 000 IU/mg, comparable to the previously reported 65 355 IU/mg of plasmin activated natural proUK([1]). Activation of plasminogen by the chimera after plasmin treatment followed Michieal-Menten kinetics, and the Km was 0.97 mumol/L, which was also comparable to 1.64 mumol/L of native urokinase. The chimera also showed intensive ability to inhibit platelet aggregationin vitro. These results indicate that this chimera might be useful as a bifunctional thrombolytic agent.
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Affiliation(s)
- B Qian
- National Laboratory of Protein Engineering, Department of Biochemistry and Molecular Biology, Life Science Centre, Peking University, 100871, Beijing, China
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Wang K, Dang X, Wu Y, Liu A, Lei G, Li X, Gao X, Yang D. [Treatment of old femoral neck fracture with implantation of a vascularized fibular graft]. Zhonghua Wai Ke Za Zhi 1998; 36:261-3, 57. [PMID: 11825382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To investigate the healing of old femoral neck fracture treated with transplantation of vascularized fibula graft accompanied with lag screw, and rehabilitation of and precaution against ischemic necrosis of femoral head. METHOD Vascularized fibula autograft was transplanted to the anterolateral side of the femoral neck with an internal fixator of lag screw. Fibular artery and vein were anastomosed with lateral circumflex artery and vein. RESULT 186 of 229 cases subjected to systemic X-ray films and function follow-up (3 to 15 years). The percentage of fracture healing was 93.0% the sulass rate 86.5%. CONCLUSION Fibula with blood supply and compressed screw have a combined fixation effect of the old femoral neck fracture. Fibula is solid enough for supporting the femoral head and preventing it from collapse. Vascularized fibular grafting provides blood supply to the affected femoral head and neck, promoting femoral head restoration and reconstruction.
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Affiliation(s)
- K Wang
- Orthopaedic Department, Second Affiliated Hospital of Xi'an Medical University, Xi'an 710004
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Li J, Wu X, Dang X, Sun X, Zhao H, Hua Y. [Effect of +Gz-induced cerebral ischemia on the distribution of nitric oxide synthase in rabbit brain]. Space Med Med Eng (Beijing) 1998; 11:102-6. [PMID: 11543224] [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: 04/16/2023]
Abstract
In order to study the effect of repeated short termed + Gz -induced cerebral ischemia on rabbit brain, rabbits were exposed to +4.0 Gz for 3 times (with 30 min interval in between) which caused the arterial pressure at eye level dropped to 0 kPa and lasted for 30 s. Changes of distribution of the nitric oxide synthase(NOS) positive neurons in rabbit brain were observed using the NADPH-diaphorase histochemical reaction. The results showed that NOS positive neurons in the parietal cortex, piriform cortex, hippocampus and dentate gyrus increased by 167%, 126%, 321%, 172% (P < 0.01) respectively, immediately after repeated + Gz exposures, as compared with those of controls. It still remained significantly more than that in controls (P < 0.01) 1 h and 6 h after exposure. It suggests that NO may have some effect on the neurons during cerebral ischemia.
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Affiliation(s)
- J Li
- Navy General Hospital, Beijing, China
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