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Ma L, Zhao W, Hou X, Liu M, Li Y, Shen L, Xu X. Identification of linear epitopes in SjSP-13 of Schistosoma japonicum using a GST-peptide fusion protein microplate array. Parasit Vectors 2019; 12:507. [PMID: 31666115 PMCID: PMC6822365 DOI: 10.1186/s13071-019-3767-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 10/23/2019] [Indexed: 12/16/2022] Open
Abstract
Background The identification and characterization of epitopes facilitate the discovery and development of new therapeutics, vaccines and diagnostics for infectious diseases. In this study, we developed a glutathione S-transferase (GST)-peptide fusion protein microplate array for the identification of linear B-cell epitopes and applied this novel method to the identification of linear B-cell epitopes of SjSP-13, an immunodiagnostic biomarker of schistosomiasis japonica. Methods SjSP-13 was divided into 17 overlapped peptides (p1-17), and the coding sequence of each peptide was obtained by annealing two complementary oligonucleotides. SjSP-13 peptides were expressed by fusion with an N-terminal GST tag and a C-terminal 6xHis tag. The GST-peptide-His fusion protein was specifically bound to the Immobilizer Glutathione MicroWell 96-well plates without purification. SjSP-13 peptides and core epitopes that could be recognized by sera from schistosomiasis patients were identified by ELISA and confirmed by Western blot analysis. The receiver operating characteristic (ROC) analysis was performed to determine the diagnostic validity of the identified peptide. Results Full-length GST-peptide-His fusion proteins were successfully expressed and specifically bound to the Immobilizer Glutathione MicroWell 96-well plates. Two adjacent peptides (p7 and p8) were found to be highly immunogenic in humans. The core epitope of p7 and p8 is an 11-aa peptide (80KCLDVTDNLPE90) and an 8-aa peptide (90EKIIQFAE97), respectively. The area under the ROC curve (AUC) value of the peptide which contains the two identified epitopes is 0.947 ± 0.019. The diagnostic sensitivity and specificity of the peptide is 76.7% (95% CI: 68.8–84.5%) and 100%, respectively. Conclusions 90EKIIQFAE97 and 80KCLDVTDNLPE90 are the two linear epitopes of SjSP-13 recognized by patient sera, and could be potential serological markers for schistosomiasis japonica.![]()
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Affiliation(s)
- Li Ma
- Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Wenrong Zhao
- Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xunya Hou
- Hunan Institute of Parasitic Diseases, Yueyang, China
| | - Mengmeng Liu
- Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Yanna Li
- Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Li Shen
- Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xindong Xu
- Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China.
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Xu X, Cui X, Zhu L, Li Z, Zhang Y, Ma L, Pan W. Effects of Polymorphisms in the SjSP-13 Gene of Schistosoma japonicum on Its Diagnostic Efficacy and Immunogenicity. Front Microbiol 2018; 9:1695. [PMID: 30140260 PMCID: PMC6094988 DOI: 10.3389/fmicb.2018.01695] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Accepted: 07/09/2018] [Indexed: 11/13/2022] Open
Abstract
Schistosomiasis japonica is one of the most prevalent parasitic diseases in China. The scarcity of effective diagnostic tools is a major factor that contributes to the high prevalence of schistosomiasis japonica. SjSP-13 is a promising serological diagnostic biomarker of the disease. However, it is unclear whether polymorphisms in SjSP-13 affect its diagnostic efficacy and immunogenicity. Here, we found the SjSP-13 gene was highly polymorphic, and all the alleles of the gene were clustered into two clades, clade A and B. SjSP-13.6 and SjSP-13.25, the representative alleles of clade A and B, were produced in Escherichia coli. The diagnostic value of SjSP-13.6 (AUC = 0.983 ± 0.006), was found to be similar to the SjSP-13.25 (AUC = 0.973 ± 0.009) by receiver operating characteristic (ROC) analysis. SjSP-13.6 and SjSP-13.25 have the same specificity (96.7%), while the sensitivity of SjSP-13.6 (90.4%) is slightly but not significantly higher than SjSP-13.25 (85.2%). The combination use of the two alleles (SjSP-13.6/25) didn’t increase the diagnostic performance of SjSP-13 as the AUC value of SjSP-13.6/25 is 0.977 ± 0.009, lower than individual SjSP-13.6 (AUC = 0.983 ± 0.006). In addition, we found the immunogenicity of clade A alleles is significantly higher than clade B in Schistosoma japonicum naturally infected animals and patients, as the mean antibody levels of SjSP-13.6 was significantly higher than SjSP-13.25. We conclude that polymorphisms of the SjSP-13 gene should not affect its diagnostic efficacy, and it is not necessary to combine the alleles of the two clades for diagnosis of schistosomiasis.
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Affiliation(s)
- Xindong Xu
- Institute for Infectious Diseases and Vaccine Development, Tongji University School of Medicine, Shanghai, China
| | - Xiaobing Cui
- Institute for Infectious Diseases and Vaccine Development, Tongji University School of Medicine, Shanghai, China
| | - Liufang Zhu
- Institute for Infectious Diseases and Vaccine Development, Tongji University School of Medicine, Shanghai, China
| | - Zhengli Li
- Institute for Infectious Diseases and Vaccine Development, Tongji University School of Medicine, Shanghai, China
| | - Yuanbin Zhang
- Institute for Infectious Diseases and Vaccine Development, Tongji University School of Medicine, Shanghai, China
| | - Li Ma
- Institute for Infectious Diseases and Vaccine Development, Tongji University School of Medicine, Shanghai, China
| | - Weiqing Pan
- Institute for Infectious Diseases and Vaccine Development, Tongji University School of Medicine, Shanghai, China.,Department of Tropical Infectious Diseases, Second Military Medical University, Shanghai, China
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Lingscheid T, Kurth F, Clerinx J, Marocco S, Trevino B, Schunk M, Muñoz J, Gjørup IE, Jelinek T, Develoux M, Fry G, Jänisch T, Schmid ML, Bouchaud O, Puente S, Zammarchi L, Mørch K, Björkman A, Siikamäki H, Neumayr A, Nielsen H, Hellgren U, Paul M, Calleri G, Kosina P, Myrvang B, Ramos JM, Just-Nübling G, Beltrame A, Saraiva da Cunha J, Kern P, Rochat L, Stich A, Pongratz P, Grobusch MP, Suttorp N, Witzenrath M, Hatz C, Zoller T. Schistosomiasis in European Travelers and Migrants: Analysis of 14 Years TropNet Surveillance Data. Am J Trop Med Hyg 2017; 97:567-574. [PMID: 28722637 PMCID: PMC5544096 DOI: 10.4269/ajtmh.17-0034] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Accepted: 03/30/2017] [Indexed: 02/05/2023] Open
Abstract
Schistosomiasis remains one of the most prevalent parasitic diseases worldwide and the infection is frequently found in travelers and migrants. The European Network for Tropical Medicine and Travel Health conducted a sentinel surveillance study on imported schistosomiasis between 1997 and 2010. This report summarizes epidemiological and clinical data from 1,465 cases of imported schistosomiasis. Direct pathogen detection and serology were the main diagnostic tools applied. Of these, 486 (33%) cases were identified among European travelers, 231 (16%) among long-term expatriates, and 748 (51%) among non-European immigrants. Overall, only 18.6% of travelers had received pretravel advice; 95% of infections were acquired in the African region. On species level, Schistosoma mansoni was identified in 570 (39%) and Schistosoma haematobium in 318 (22%) cases; 57.5% of patients were symptomatic. Acute symptoms were reported in 27% of patients leading to earlier presentation within 3 months. Praziquantel was used in all patients to treat schistosomiasis. Many infections were detected in asymptomatic patients. In 47.4% of asymptomatic patients infection was detected by microscopy and in 39% by serology or antigen testing. Schistosomiasis remains a frequent infection in travelers and migrants to Europe. Travelers should be made aware of the risk of schistosomiasis infection when traveling to sub-Saharan Africa. Posttravel consultations particularly for returning expatriates are useful given the high potential for detecting asymptomatic infections.
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Affiliation(s)
- Tilman Lingscheid
- Medizinische Klinik mit Schwerpunkt Infektiologie und Pneumologie, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Florian Kurth
- Medizinische Klinik mit Schwerpunkt Infektiologie und Pneumologie, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Jan Clerinx
- Institute of Tropical Medicine, Antwerp, Belgium
| | - Stefania Marocco
- Centro per le Malattie Tropicali, Ospedale S. Cuore, Negrar, Verona, Italy
| | - Begoña Trevino
- Tropical Medicine and International Health Unit, Hospital Vall d’Hebron Drassanes, PROSICS Barcelona, Barcelona, Spain
| | - Mirjam Schunk
- Division of Infectious Diseases and Tropical Medicine, Medical Centre of the Ludwig-Maximilians-University (LMU), Munich, Germany
| | - José Muñoz
- ISGlobal, Barcelona Centre for International Health Research (CRESIB), Hospital Clínic-Universitat de Barcelona, Barcelona, Spain
| | - Ida E. Gjørup
- Infectious Diseases Unit, Herlev University Hospital, Copenhagen, Denmark
| | - Tomas Jelinek
- Berlin Centre for Travel and Tropical Medicine, Berlin, Germany
| | - Michel Develoux
- Service de Parasitologie, Hôpital Saint-Antoine, Paris, France
| | - Graham Fry
- Tropical Medical Bureau, Dublin, Ireland
| | - Thomas Jänisch
- Department of Infectious Diseases, University Hospital Heideberg, Heidelberg, Germany
| | - Matthias L. Schmid
- Department of Infection and Tropical Medicine, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom
| | - Olivier Bouchaud
- Consultation de médecine tropicale, Hôpital Avicenne, Bobigny, France
| | | | - Lorenzo Zammarchi
- Infectious Diseases Unit, Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Kristine Mørch
- Department of Medicine, National Centre for Tropical Infectious Diseases, Haukeland University Hospital, Bergen, Norway
| | - Anders Björkman
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
| | - Heli Siikamäki
- Inflammation Centre, Clinic of Infectious Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Andreas Neumayr
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
| | - Henrik Nielsen
- Department of Infectious Diseases, Aalborg University Hospital, Aalborg, Denmark
| | - Urban Hellgren
- Unit of Infectious Diseases, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, Sweden
| | - Malgorzata Paul
- Department and Clinic of Tropical and Parasitic Diseases, Karol Marcinkowski University of Medical Sciences, Poznan, Poland
| | - Guido Calleri
- Travel Medicine Unit, Department of Infectious Diseases, Amedeo di Savoia Hospital-ASLTO2, Turin, Italy
| | - Pavel Kosina
- Department of Infectious Diseases, University Hospital, Hradec Králové, Czech Republic
| | | | - José M. Ramos
- Infectious Diseases Unit, Hospital General Universitario de Elche, Alicante, Spain
| | - Gudrun Just-Nübling
- Department of Internal Medicine II, Section Infectious Diseases and Tropical Medicine, University Hospital Frankfurt, Main, Germany
| | - Anna Beltrame
- Centro per le Malattie Tropicali, Ospedale S. Cuore, Negrar, Verona, Italy
- Clinic of Infectious Diseases, University of Udine, Udine, Italy
| | | | - Peter Kern
- Department of Internal Medicine III, Comprehensive Infectious Diseases Center, Ulm University Hospital, Ulm, Germany
| | - Laurence Rochat
- Department of Ambulatory Care and Community Medicine, Travel Clinic, University Hospital, Lausanne, Switzerland
| | - August Stich
- Abteilung Tropenmedizin, Missionsärztliche Klinik, Würzburg, Germany
| | - Peter Pongratz
- Division of Tropical Medicine and Infectious Diseases, Rostock University Medical Center, Germany
| | - Martin P. Grobusch
- Center of Tropical Medicine and Travel Medicine, Academic Medical Center, University of Amsterdam, The Netherlands
| | - Norbert Suttorp
- Medizinische Klinik mit Schwerpunkt Infektiologie und Pneumologie, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Martin Witzenrath
- Medizinische Klinik mit Schwerpunkt Infektiologie und Pneumologie, Charité Universitätsmedizin Berlin, Berlin, Germany
| | - Christoph Hatz
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
- Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland
| | - Thomas Zoller
- Medizinische Klinik mit Schwerpunkt Infektiologie und Pneumologie, Charité Universitätsmedizin Berlin, Berlin, Germany
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
| | - TropNet Schistosomiasis Investigator Group
- Medizinische Klinik mit Schwerpunkt Infektiologie und Pneumologie, Charité Universitätsmedizin Berlin, Berlin, Germany
- Institute of Tropical Medicine, Antwerp, Belgium
- Centro per le Malattie Tropicali, Ospedale S. Cuore, Negrar, Verona, Italy
- Tropical Medicine and International Health Unit, Hospital Vall d’Hebron Drassanes, PROSICS Barcelona, Barcelona, Spain
- Division of Infectious Diseases and Tropical Medicine, Medical Centre of the Ludwig-Maximilians-University (LMU), Munich, Germany
- ISGlobal, Barcelona Centre for International Health Research (CRESIB), Hospital Clínic-Universitat de Barcelona, Barcelona, Spain
- Infectious Diseases Unit, Herlev University Hospital, Copenhagen, Denmark
- Berlin Centre for Travel and Tropical Medicine, Berlin, Germany
- Service de Parasitologie, Hôpital Saint-Antoine, Paris, France
- Tropical Medical Bureau, Dublin, Ireland
- Department of Infectious Diseases, University Hospital Heideberg, Heidelberg, Germany
- Department of Infection and Tropical Medicine, Royal Victoria Infirmary, Newcastle upon Tyne, United Kingdom
- Consultation de médecine tropicale, Hôpital Avicenne, Bobigny, France
- Hospital Carlos III, Madrid, Spain
- Infectious Diseases Unit, Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
- Department of Medicine, National Centre for Tropical Infectious Diseases, Haukeland University Hospital, Bergen, Norway
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
- Inflammation Centre, Clinic of Infectious Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Swiss Tropical and Public Health Institute, Basel, Switzerland
- University of Basel, Basel, Switzerland
- Department of Infectious Diseases, Aalborg University Hospital, Aalborg, Denmark
- Unit of Infectious Diseases, Department of Medicine Huddinge, Karolinska Institutet, Stockholm, Sweden
- Department and Clinic of Tropical and Parasitic Diseases, Karol Marcinkowski University of Medical Sciences, Poznan, Poland
- Travel Medicine Unit, Department of Infectious Diseases, Amedeo di Savoia Hospital-ASLTO2, Turin, Italy
- Department of Infectious Diseases, University Hospital, Hradec Králové, Czech Republic
- Oslo University Hospital, Ullevål, Norway
- Infectious Diseases Unit, Hospital General Universitario de Elche, Alicante, Spain
- Department of Internal Medicine II, Section Infectious Diseases and Tropical Medicine, University Hospital Frankfurt, Main, Germany
- Clinic of Infectious Diseases, University of Udine, Udine, Italy
- Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
- Department of Internal Medicine III, Comprehensive Infectious Diseases Center, Ulm University Hospital, Ulm, Germany
- Department of Ambulatory Care and Community Medicine, Travel Clinic, University Hospital, Lausanne, Switzerland
- Abteilung Tropenmedizin, Missionsärztliche Klinik, Würzburg, Germany
- Division of Tropical Medicine and Infectious Diseases, Rostock University Medical Center, Germany
- Center of Tropical Medicine and Travel Medicine, Academic Medical Center, University of Amsterdam, The Netherlands
- Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland
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Kim YJ, Yoo WG, Lee MR, Kang JM, Na BK, Cho SH, Park MY, Ju JW. Molecular and Structural Characterization of the Tegumental 20.6-kDa Protein in Clonorchis sinensis as a Potential Druggable Target. Int J Mol Sci 2017; 18:E557. [PMID: 28273846 PMCID: PMC5372573 DOI: 10.3390/ijms18030557] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 02/24/2017] [Accepted: 02/28/2017] [Indexed: 11/17/2022] Open
Abstract
The tegument, representing the membrane-bound outer surface of platyhelminth parasites, plays an important role for the regulation of the host immune response and parasite survival. A comprehensive understanding of tegumental proteins can provide drug candidates for use against helminth-associated diseases, such as clonorchiasis caused by the liver fluke Clonorchis sinensis. However, little is known regarding the physicochemical properties of C. sinensis teguments. In this study, a novel 20.6-kDa tegumental protein of the C. sinensis adult worm (CsTegu20.6) was identified and characterized by molecular and in silico methods. The complete coding sequence of 525 bp was derived from cDNA clones and encodes a protein of 175 amino acids. Homology search using BLASTX showed CsTegu20.6 identity ranging from 29% to 39% with previously-known tegumental proteins in C. sinensis. Domain analysis indicated the presence of a calcium-binding EF-hand domain containing a basic helix-loop-helix structure and a dynein light chain domain exhibiting a ferredoxin fold. We used a modified method to obtain the accurate tertiary structure of the CsTegu20.6 protein because of the unavailability of appropriate templates. The CsTegu20.6 protein sequence was split into two domains based on the disordered region, and then, the structure of each domain was modeled using I-TASSER. A final full-length structure was obtained by combining two structures and refining the whole structure. A refined CsTegu20.6 structure was used to identify a potential CsTegu20.6 inhibitor based on protein structure-compound interaction analysis. The recombinant proteins were expressed in Escherichia coli and purified by nickel-nitrilotriacetic acid affinity chromatography. In C. sinensis, CsTegu20.6 mRNAs were abundant in adult and metacercariae, but not in the egg. Immunohistochemistry revealed that CsTegu20.6 localized to the surface of the tegument in the adult fluke. Collectively, our results contribute to a better understanding of the structural and functional characteristics of CsTegu20.6 and homologs of flukes. One compound is proposed as a putative inhibitor of CsTegu20.6 to facilitate further studies for anthelmintics.
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Affiliation(s)
- Yu-Jung Kim
- Division of Malaria and Parasitic Diseases, Centre for Immunology and Pathology, Korea National Research Institute of Health, Chungbuk 28159, Korea.
| | - Won Gi Yoo
- Division of Malaria and Parasitic Diseases, Centre for Immunology and Pathology, Korea National Research Institute of Health, Chungbuk 28159, Korea.
| | - Myoung-Ro Lee
- Division of Malaria and Parasitic Diseases, Centre for Immunology and Pathology, Korea National Research Institute of Health, Chungbuk 28159, Korea.
| | - Jung-Mi Kang
- Department of Parasitology and Tropical Medicine, and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 52727, Korea.
| | - Byoung-Kuk Na
- Department of Parasitology and Tropical Medicine, and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 52727, Korea.
| | - Shin-Hyeong Cho
- Division of Malaria and Parasitic Diseases, Centre for Immunology and Pathology, Korea National Research Institute of Health, Chungbuk 28159, Korea.
| | - Mi-Yeoun Park
- Division of Malaria and Parasitic Diseases, Centre for Immunology and Pathology, Korea National Research Institute of Health, Chungbuk 28159, Korea.
| | - Jung-Won Ju
- Division of Malaria and Parasitic Diseases, Centre for Immunology and Pathology, Korea National Research Institute of Health, Chungbuk 28159, Korea.
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