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Sharma S, Suri D, Aggarwal AN, Yadav R, Sethi S, Laal S, Verma I. Evaluation of immunodominant peptides of in vivo expressed mycobacterial antigens in an ELISA-based diagnostic assay for pulmonary tuberculosis. Braz J Microbiol 2023; 54:1751-1759. [PMID: 37198420 PMCID: PMC10485188 DOI: 10.1007/s42770-023-00998-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 04/27/2023] [Indexed: 05/19/2023] Open
Abstract
Non-sputum-based biomarker assay is urgently required as per WHO's target product pipeline for diagnosis of tuberculosis. Therefore, the current study was designed to evaluate the utility of previously identified proteins, encoded by in vivo expressed mycobacterial transcripts in pulmonary tuberculosis, as diagnostic targets for a serodiagnostic assay. A total of 300 subjects were recruited including smear+, smear- pulmonary tuberculosis (PTB) patients, sarcoidosis patients, lung cancer patients and healthy controls. Proteins encoded by eight in vivo expressed transcripts selected from previous study including those encoded by two topmost expressed and six RD transcripts (Rv0986, Rv0971, Rv1965, Rv1971, Rv2351c, Rv2657c, Rv2674, Rv3121) were analyzed for B-cell epitopes by peptide arrays/bioinformatics. Enzyme-linked immunosorbent assay was used to evaluate the antibody response against the selected peptides in sera from PTB and controls. Overall 12 peptides were selected for serodiagnosis. All the peptides were initially screened for their antibody response. The peptide with highest sensitivity and specificity was further assessed for its serodiagnostic ability in all the study subjects. The mean absorbance values for antibody response to selected peptide were significantly higher (p<0.001) in PTB patients as compared to healthy controls; however, the sensitivity for diagnosis of PTB was 31% for smear+ and 20% for smear- PTB patients. Thus, the peptides encoded by in vivo expressed transcripts elicited a significant antibody response, but are not suitable candidates for serodiagnosis of PTB.
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Affiliation(s)
- Sumedha Sharma
- Department of Biochemistry, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012 India
| | - Deepti Suri
- Advanced Pediatric Centre, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012 India
| | - Ashutosh N. Aggarwal
- Department of Pulmonary Medicine, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012 India
| | - Rakesh Yadav
- Department of Medical Microbiology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012 India
| | - Sunil Sethi
- Department of Medical Microbiology, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012 India
| | - Suman Laal
- Department of Pathology, New York University School of Medicine, New York, NY 10010 USA
| | - Indu Verma
- Department of Biochemistry, Post Graduate Institute of Medical Education and Research, Chandigarh, 160012 India
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Dewi DNSS, Mertaniasih NM, Soedarsono, Hagino K, Yamazaki T, Ozeki Y, Artama WT, Kobayashi H, Inouchi E, Yoshida Y, Ishikawa S, Shaban AK, Tateishi Y, Nishiyama A, Ato M, Matsumoto S. Antibodies against native proteins of Mycobacterium tuberculosis can detect pulmonary tuberculosis patients. Sci Rep 2023; 13:12685. [PMID: 37542102 PMCID: PMC10403504 DOI: 10.1038/s41598-023-39436-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 07/25/2023] [Indexed: 08/06/2023] Open
Abstract
Accurate point-of-care testing (POCT) is critical for managing tuberculosis (TB). However, current antibody-based diagnosis shows low specificity and sensitivity. To find proper antigen candidates for TB diagnosis by antibodies, we assessed IgGs responsiveness to Mycobacterium tuberculosis proteins in pulmonary TB (PTB) patients. We employed major secreted proteins, such as Rv1860, Ag85C, PstS1, Rv2878c, Ag85B, and Rv1926c that were directly purified from M. tuberculosis. In the first screening, we found that IgG levels were significantly elevated in PTB patients only against Rv1860, PstS1, and Ag85B among tested antigens. However, recombinant PstS1 and Ag85B from Escherichia coli (E. coli) couldn't distinguish PTB patients and healthy controls (HC). Recombinant Rv1860 was not checked due to its little expression. Then, the 59 confirmed PTB patients from Soetomo General Academic Hospital, Surabaya, Indonesia, and 102 HC were tested to Rv1860 and Ag85B only due to the low yield of the PstS1 from M. tuberculosis. The ROC analysis using native Ag85B and Rv1860 showed an acceptable area under curve for diagnosis, which is 0.812 (95% CI 0.734-0.890, p < 0.0001) and 0.821 (95% CI 0.752-0.890, p < 0.0001). This study indicates that taking consideration of native protein structure is key in developing TB's POCT by antibody-based diagnosis.
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Affiliation(s)
- Desak Nyoman Surya Suameitria Dewi
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan.
- Department of Microbiology, Faculty of Medicine, Universitas Ciputra, CitraLand CBD Boulevard, Made, Kec. Sambikerep, Surabaya, 60219, Indonesia.
| | - Ni Made Mertaniasih
- Department of Medical Microbiology, Faculty of Medicine, Universitas Airlangga, Jl. Mayjen Prof. Dr. Moestopo 47, Surabaya, 60131, Indonesia.
- Laboratory of Tuberculosis, Institute of Tropical Disease, Universitas Airlangga, Kampus C Jl. Mulyorejo, Surabaya, 60115, Indonesia.
| | - Soedarsono
- Sub-Pulmonology Department of Internal Medicine, Faculty of Medicine, Hang Tuah University, Komplek Barat RSAL Dr. Ramelan, Jl. Gadung No.1, Jagir, Surabaya, 60111, Indonesia
| | - Kimika Hagino
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
| | - Tomoya Yamazaki
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
| | - Yuriko Ozeki
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
| | - Wayan Tunas Artama
- Department of Biochemistry, Faculty of Veterinary Medicine, Universitas Gadjah Mada, Jl. Fauna 2 Karangmalang, Yogyakarta, 55281, Indonesia
- One Health/Eco-Health Resource Center, Universitas Gadjah Mada, Jl. Teknika Utara, Barek, Sleman, Yogyakarta, 55281, Indonesia
| | - Haruka Kobayashi
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
| | - Erina Inouchi
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
| | - Yutaka Yoshida
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
| | - Satoshi Ishikawa
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
- Fukuyama Zoo, 276‑1, Fukuda, Ashida‑cho, Fukuyama, Hiroshima, 720‑1264, Japan
| | - Amina Kaboso Shaban
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
| | - Yoshitaka Tateishi
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
| | - Akihito Nishiyama
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan
| | - Manabu Ato
- Department of Mycobacteriology, Leprosy Research Center, National Institute of Infectious Diseases, Aoba-cho 4-2-1, Higashimurayama-shi, Tokyo, 189-0002, Japan
| | - Sohkichi Matsumoto
- Department of Bacteriology, School of Medicine, Niigata University, Asahimachi-Dori 1-757, Chuo-ku, Niigata, 951-8510, Japan.
- Department of Medical Microbiology, Faculty of Medicine, Universitas Airlangga, Jl. Mayjen Prof. Dr. Moestopo 47, Surabaya, 60131, Indonesia.
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Zhou F, Xu X, Cui X, Pan W. Development and Evaluation of a Fusion Polyprotein Based on HspX and Other Antigen Sequences for the Serodiagnosis of Tuberculosis. Front Immunol 2021; 12:726920. [PMID: 34671347 PMCID: PMC8521024 DOI: 10.3389/fimmu.2021.726920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 09/17/2021] [Indexed: 11/13/2022] Open
Abstract
Background The lack of suitable diagnostic tools contributes to the high prevalence of tuberculosis (TB) worldwide. Serological tests, based on multiple target antigens, represent an attractive option for diagnosis of this disease due to their rapidity, convenience, and low cost. Methods Measures to reduce non-specific reactions and thereby improve the specificity of serological tests were investigated, including blocking antibodies against common bacteria in serum samples and synthesizing polypeptides covering non-conserved dominant B-cell epitopes of antigens. In addition, a fusion polyprotein containing HspX and eight other antigen sequences was constructed and expressed to increase overall sensitivity of the tests. Results Inclusion of Escherichia coli lysate partially increased the specificity of the serological tests, while synthesis and inclusion of peptides containing non-conserved sequences of TB antigens as well as dominant B-cell epitopes reduced non-specific reactions without a decrease in sensitivity of the tests. A polyprotein fusing HspX and eight other antigen sequences was constructed and displayed 60.2% sensitivity, which was higher than that of HspX and the other individual antigen segments. Moreover, the specificity of the polyprotein was 93.8%, which was not significantly decreased when compared with HspX and the other individual antigen segments. Conclusions The roles of the fusion polyprotein in the humoral immune response against TB infection were demonstrated and provide a potential novel approach for the development of TB diagnostics.
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Affiliation(s)
- Fangbin Zhou
- Department of Tropical Diseases, Naval Medical University, Shanghai, China
- Clinical Medical Research Center, The Second Clinical Medical College, Shenzhen People’s Hospital, Jinan University, Shenzhen, China
- Institute for Infectious Diseases and Vaccine Development, Tongji University School of Medicine, Shanghai, China
| | - 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
| | - Weiqing Pan
- Department of Tropical Diseases, Naval Medical University, Shanghai, China
- Institute for Infectious Diseases and Vaccine Development, Tongji University School of Medicine, Shanghai, China
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