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Sy Thau N, Nguyen TK, Truong NV, Chu TTH, Na SH, Moon RW, Lau YL, Nyunt MH, Park WS, Chun WJ, Lu F, Lee SK, Han JH, Han ET. Characterization of merozoite-specific thrombospondin-related anonymous protein (MTRAP) in Plasmodium vivax and P. knowlesi parasites. Front Cell Infect Microbiol 2024; 14:1354880. [PMID: 38465236 PMCID: PMC10920329 DOI: 10.3389/fcimb.2024.1354880] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Accepted: 02/08/2024] [Indexed: 03/12/2024] Open
Abstract
Plasmodium vivax, the most widespread human malaria parasite, and P. knowlesi, an emerging Plasmodium that infects humans, are the phylogenetically closest malarial species that infect humans, which may induce cross-species reactivity across most co-endemic areas in Southeast Asia. The thrombospondin-related anonymous protein (TRAP) family is indispensable for motility and host cell invasion in the growth and development of Plasmodium parasites. The merozoite-specific TRAP (MTRAP), expressed in blood-stage merozoites, is supposed to be essential for human erythrocyte invasion. We aimed to characterize MTRAPs in blood-stage P. vivax and P. knowlesi parasites and ascertain their cross-species immunoreactivity. Recombinant P. vivax and P. knowlesi MTRAPs of full-length ectodomains were expressed in a mammalian expression system. The MTRAP-specific immunoglobulin G, obtained from immune animals, was used in an immunofluorescence assay for subcellular localization and invasion inhibitory activity in blood-stage parasites was determined. The cross-species humoral immune responses were analyzed in the sera of patients with P. vivax or P. knowlesi infections. The MTRAPs of P. vivax (PvMTRAP) and P. knowlesi (PkMTRAP) were localized on the rhoptry body of merozoites in blood-stage parasites. Both anti-PvMTRAP and anti-PkMTRAP antibodies inhibited erythrocyte invasion of blood-stage P. knowlesi parasites. The humoral immune response to PvMTRAP showed high immunogenicity, longevity, and cross-species immunoreactivity with P. knowlesi. MTRAPs are promising candidates for development of vaccines and therapeutics against vivax and knowlesi malaria.
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Affiliation(s)
- Nguyen Sy Thau
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon, Gangwon-do, Republic of Korea
| | - Tuyet-Kha Nguyen
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon, Gangwon-do, Republic of Korea
| | - Nguyen Van Truong
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon, Gangwon-do, Republic of Korea
| | - Thi-Thanh Hang Chu
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon, Gangwon-do, Republic of Korea
| | - Sung-Hun Na
- Department of Obstetrics and Gynecology, Kangwon National University School of Medicine, Chuncheon, Gangwon-d, Republic of Korea
| | - Robert W. Moon
- Department of Infection Biology, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, United Kingdom
| | - Yee Ling Lau
- Department of Parasitology, Faculty of Medicine, Universiti Malaya, Kuala Lumpur, Malaysia
| | | | - Won-Sun Park
- Department of Physiology, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, Republic of Korea
| | - Wan-Joo Chun
- Department of Pharmacology, School of Medicine, Kangwon National University, Chuncheon, Gangwon-do, Republic of Korea
| | - Feng Lu
- Department of Pathogen Biology and Immunology, School of Medicine, Yangzhou University, Yangzhou, Jiangsu, China
| | - Seong-Kyun Lee
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon, Gangwon-do, Republic of Korea
| | - Jin-Hee Han
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon, Gangwon-do, Republic of Korea
| | - Eun-Taek Han
- Department of Medical Environmental Biology and Tropical Medicine, Kangwon National University School of Medicine, Chuncheon, Gangwon-do, Republic of Korea
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Trung NT, Lien TT, Sang VV, Hoan NX, Manh ND, Thau NS, Quyen DT, Hien TTT, Hoan PQ, Bang MH, Velavan TP, Song LH. Circulating miR-147b as a diagnostic marker for patients with bacterial sepsis and septic shock. PLoS One 2021; 16:e0261228. [PMID: 34914790 PMCID: PMC8675720 DOI: 10.1371/journal.pone.0261228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 11/24/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Early diagnosis, precise antimicrobial treatment and subsequent patient stratification can improve sepsis outcomes. Circulating biomarkers such as plasma microRNAs (miRNAs) have proven to be surrogates for diagnosis, severity and case management of infections. The expression of four selected miRNAs (miR-146-3p, miR-147b, miR-155 and miR-223) was validated for their prognostic and diagnostic potential in a clinically defined cohort of patients with sepsis and septic shock. METHODS The expression of plasma miRNAs was quantified by quantitative PCR (qPCR) in patients with bacterial sepsis (n = 78), in patients with septic shock (n = 52) and in patients with dengue haemorrhagic fever (DHF; n = 69) and in healthy controls (n = 82). RESULTS The expression of studied miRNA was significantly increased in patients with bacterial sepsis and septic shock. The plasma miR-147b was able to differentiate bacterial sepsis from non-sepsis and septic shock (AUC = 0.77 and 0.8, respectively, p≤ 0.05), while the combination of plasma miR-147b and procalcitonin (PCT) predicted septic shock (AUC = 0.86, p≤ 0.05). CONCLUSIONS The plasma miR-147b may be an useful biomarker independently or in combination with PCT to support clinical diagnosis of sepsis and equally prognosis of patients with septic shock.
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Affiliation(s)
- Ngo Tat Trung
- Centre for Genetics Consultation and Cancer Screening, Hanoi, Vietnam
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
- Department of Molecular Biology, Hanoi, Vietnam
- * E-mail: (LHS); (NTT)
| | - Tran Thi Lien
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
| | - Vu Viet Sang
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
- Institute of Clinical Infectious Diseases, Hanoi, Vietnam
| | - Nghiem Xuan Hoan
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
- Department of Molecular Biology, Hanoi, Vietnam
| | - Nguyen Dang Manh
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
- Institute of Clinical Infectious Diseases, Hanoi, Vietnam
| | - Nguyen Sy Thau
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
- Institute of Clinical Infectious Diseases, Hanoi, Vietnam
| | - Dao Thanh Quyen
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
- Department of Molecular Biology, Hanoi, Vietnam
| | | | | | - Mai Hong Bang
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
- Department of Gastroenterology, Hanoi, Vietnam
| | - Thirumalaisamy P. Velavan
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
- Institute of Tropical Medicine, Universitätsklinikum Tübingen, Tübingen, Germany
| | - Le Huu Song
- Vietnamese-German Center for Medical Research, Hanoi, Vietnam
- Institute of Clinical Infectious Diseases, Hanoi, Vietnam
- * E-mail: (LHS); (NTT)
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Trung NT, Thau NS, Bang MH, Song LH. PCR-based Sepsis@Quick test is superior in comparison with blood culture for identification of sepsis-causative pathogens. Sci Rep 2019; 9:13663. [PMID: 31541157 PMCID: PMC6754458 DOI: 10.1038/s41598-019-50150-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 12/31/2018] [Accepted: 09/05/2019] [Indexed: 12/17/2022] Open
Abstract
Sepsis is an acute, often fatal syndrome that requires early diagnosis and proper treatment. Blood culture (BC) is the gold standard for the identification of pathogens, however it has marked limitations, including that it is time-consuming (delaying treatment) and can only detect microbes that readily grow under culture conditions. Alternatively, non-culture-based methodologies like polymerase chain reaction (PCR) are faster but also have limitations; e.g., the reaction is often inhibited by the abundance of human DNA and thus can only detect limited known target pathogens. In our previous publication, we have demonstrated a proof-of-concept of a simple pre-analytical tool to remove human DNA from patients’ blood specimens, hence allowing downstream PCRs to detect rare bacterial genetic materials. In the current study, we reported a better performance of a novel prototype diagnosis kit named Sepsis@Quick that combines human DNA removal step with real-time PCRs compared to blood-culture for identifying sepsis causative bacteria. Our data showed that Sepsis@Quick is superior to blood culture in which the novel diagnostic kit could identify more pathogens and even polymicrobial infection, faster and less influenced by the empirical administration of broad spectrum antibiotic therapy (single administration or combination of cephalosporin III and fluoroquinolon). Additionally, for the first time, we demonstrated that positive results achieved by Sepsis@Quick are significantly associated with a reduction of sepsis-related mortality.
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Affiliation(s)
- Ngo Tat Trung
- Vietnamese-German Center for Medical Research (VG-CARE), 108 Military Central Hospital, Hà Nội, Vietnam. .,Centre for Genetic Consultation and Cancer Screening, 108 Military Central Hospital, Hà Nội, Vietnam. .,Department of Molecular Biology, 108 Military Central Hospital, Hà Nội, Vietnam.
| | - Nguyen Sy Thau
- Vietnamese-German Center for Medical Research (VG-CARE), 108 Military Central Hospital, Hà Nội, Vietnam.,Faculty of Tropical and Infectious Diseases, 108 Military Central Hospital, Hà Nội, Vietnam
| | - Mai Hong Bang
- Vietnamese-German Center for Medical Research (VG-CARE), 108 Military Central Hospital, Hà Nội, Vietnam
| | - Le Huu Song
- Vietnamese-German Center for Medical Research (VG-CARE), 108 Military Central Hospital, Hà Nội, Vietnam. .,Faculty of Tropical and Infectious Diseases, 108 Military Central Hospital, Hà Nội, Vietnam.
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