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The Rv3874-Rv3875 chimeric protein shows a promiscuous serodiagnostic potential for tuberculosis. Tuberculosis (Edinb) 2022; 136:102253. [PMID: 36067572 PMCID: PMC9424118 DOI: 10.1016/j.tube.2022.102253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 08/22/2022] [Accepted: 08/24/2022] [Indexed: 11/21/2022]
Abstract
Tuberculosis (TB) stays a major cause of death globally after COVID-19 and HIV. An early diagnosis to control TB effectively, needs a fast reliable diagnostic method with high sensitivity. Serodiagnosis involving polyclonal antibodies detection against an antigen of Mycobacterium tuberculosis (Mtb) in serum samples can be instrumental. In our study, Rv3874 and Rv3875 antigens were cloned, expressed, and purified individually and as a chimeric construct in Escherichia coli BL21. Enzyme-Linked Immunosorbent Assay (ELISA) based findings revealed that the Rv3874-Rv3875 chimeric construct was two-fold more sensitive (59.7%) than the individual sensitivities of Rv3874 (28.4%) and Rv3875 (24.9%) for 201 serum TB positive samples. Furthermore, the fusion construct was a little more sensitive (60.4%) for male subjects than that for females (58.8%). Lastly, our preliminary findings, molecular insights of secondary structure, and statistical and in silico analysis of each construct also advocate that CEP can be considered a better immunodiagnostic tool in addition to previously reported EC skin test.
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Yaqoob C, Shahid S, Khaliq A, un Nisa Z, Khan IH, Akhtar MW. Designing Fusion Molecules from Antigens of Mycobacterium tuberculosis to Enhance Serodiagnostic Sensitivity in Latent TB Infection and Active TB State. Int J Pept Res Ther 2021. [DOI: 10.1007/s10989-021-10341-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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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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ESAT-6 and Ag85A Synthetic Peptides as Candidates for an Immunodiagnostic Test in Children with a Clinical Suspicion of Tuberculosis. DISEASE MARKERS 2021; 2021:6673250. [PMID: 34306256 PMCID: PMC8279849 DOI: 10.1155/2021/6673250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 06/16/2021] [Indexed: 11/17/2022]
Abstract
Background Tuberculosis (TB) is being underdetected in children as most are smear-negative. This work was aimed at evaluating ESAT-6 and Ag85A synthetic peptides' serodiagnostic potential for diagnosing children having a clinical suspicion of TB. Methods The study involved 438 children: 77 Creole nonindigenous (13 suspected of having TB and 64 healthy ones) and 361 Warao indigenous children (39 suspected of TB and 322 healthy children). The approach's diagnostic information was compared using operational characteristics and receiver-operating characteristic (ROC) curves. Results Ag85A P-29879 had 94.6% sensitivity (AUC = 0.741: 0.651 to 0.819 95% CI) in indigenous children. ESAT-6 P-12036 and P-12037 had 100% and 92.3% of sensitivity (AUC = 0.929: 0.929: 0.846 to 0.975 95% CI and 0.791: 63.9 to 98.7 95% CI, respectively) in Creole children. ESAT-6 peptides also allowed a differentiation between children with TB and healthy ones. Conclusions Further validation of this approach could lead to developing a complementary tool for rapid TB diagnosis in children.
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Arif S, Akhter M, Khaliq A, Nisa ZU, Khan IH, Akhtar MW. Serodiagnostic evaluation of fusion proteins from multiple antigens of Mycobacterium tuberculosis for active TB. Tuberculosis (Edinb) 2021; 127:102053. [PMID: 33561630 DOI: 10.1016/j.tube.2021.102053] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 01/07/2021] [Accepted: 01/18/2021] [Indexed: 10/22/2022]
Abstract
Tuberculosis (TB) is a global health problem, being prevalent in the developing countries. A rapid, reliable and cost effective diagnostic method would help in controlling TB in the endemic populations. Development of suitable fusion molecules detecting multiple antibodies produced against Mycobacterium tuberculosis antigens would enhance sensitivity of serodiagnostic assays. In this study, EspC, CFP7 and PPE57 antigens of M. tuberculosis were selected for constructing fusion molecules after prediction of B-cell epitopes using in silico tools. Fusion proteins EspC-CFP7, HspX-EspC-CFP7 and HspX-EspC-CFP7-PPE57 were expressed in E.coli (BL21). The serodiagnostic potential of the individual antigens and their fusions was analyzed by screening 230 plasma samples of pulmonary TB patients. The single antigens HspX, EspC, CFP7, PPE57 showed sensitivities of 30%, 31%, 22% and 35%, respectively. The fusion protein EspC-CFP7 showed sensitivity of 43%. Linking of HspX antigen to the N-terminus of EspC-CFP7 fusion molecule increased sensitivity to 58%, while joining PPE57 antigen to the C-terminus of HspX-EspC-CFP7 increased sensitivity to 69%. The fusion protein HspX-EspC-CFP7-PPE57 seems to be a promising molecule for use in the development of fusions with higher sensitivity.
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Affiliation(s)
- Shaista Arif
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Mohsina Akhter
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Aasia Khaliq
- Armed Forces Institute of Pathology, Rawalpindi, Pakistan
| | | | - Imran H Khan
- Department of Pathology and Laboratory Medicine, University of California, Davis, USA
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Sulman S, Shahid S, Khaliq A, Ambreen A, Khan IH, Cooper AM, Akhtar MW. Enhanced serodiagnostic potential of a fusion molecule consisting of Rv1793, Rv2628 and a truncated Rv2608 of Mycobacterium tuberculosis. PLoS One 2021; 16:e0258389. [PMID: 34767571 PMCID: PMC8589213 DOI: 10.1371/journal.pone.0258389] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 09/25/2021] [Indexed: 11/19/2022] Open
Abstract
Serodiagnosis of tuberculosis (TB) can be rapid, reliable and cost-effective if the issue of variable antibody responses of TB patients against different Mycobacterium tuberculosis (Mtb) antigens can be overcome by developing fusion proteins containing epitopes from multiple antigens of Mtb. In this study, Mtb antigens Rv1793, Rv2628, Rv2608 and a truncated variant produced by removing non-epitopic region from N-terminal of Rv2608 (tnRv2608), and the fusion protein Rv1793-Rv2628-tnRv2608 (TriFu64), were expressed in E. coli and purified. Plasma samples from TB patients characterized by sex, age and sputum/culture positivity, were used to compare the sensitivity of the single antigens with the fusion protein. Sensitivity of Rv1793, Rv2628 and Rv2608, was 27.8%, 39% and 36.3%, respectively. Truncation of Rv2608 increased sensitivity by approximately 35% in confirmed TB cases. Sensitivity of the fusion construct, TriFu64 increased to 66% with a specificity of 100%. Importantly, tnRv2608 was better able to detect sputum and culture negative patients, and this carried through to the fusion protein. We demonstrate that fusion of Mtb proteins ensures broad sensitivity across disease types, sex and age groups in a Pakistani population.
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Affiliation(s)
- Sadaf Sulman
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Saher Shahid
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Aasia Khaliq
- Armed Forces Institute of Pathology, Rawalpindi, Pakistan
| | - Atiqa Ambreen
- Department of Microbiology, Gulab Devi Hospital, Lahore, Pakistan
| | - Imran H. Khan
- Department of Pathology and Laboratory Medicine, University of California, Davis, California, United States of America
| | - Andrea M. Cooper
- Department of Respiratory Sciences, University of Leicester, Leicester, United Kingdom
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Ahlawat S, Chaudhary R, Dangi M, Bala K, Singh M, Chhillar AK. Advances in tuberculous meningitis diagnosis. Expert Rev Mol Diagn 2020; 20:1229-1241. [PMID: 33259249 DOI: 10.1080/14737159.2020.1858805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Introduction: Tuberculous meningitis (TBM) is the most devastating form of central nervous system tuberculosis (TB) and causes high mortality worldwide. Nonspecific clinical manifestations and limited sensitivity of existing laboratory methods make the diagnosis elusive due to the paucibacillary nature of the infection. Areas Covered: We reviewed current literature on the adequacy and limitations of globally existing laboratory methods for diagnosing TBM. Expert opinion: TBM is deadliest among all TB forms, as the outcome may lead to death in 50% of cases, and survivors undergo irreversible neurological disorders. Therefore, early diagnosis and prompt treatment are cornerstones of effective disease management. Conventional microscopy and culture are widely used modalities but remain inadequate in most TBM cases. Although expanded use of rapid molecular tests such as real-time PCR and Xpert Ultra, even in resource-limited settings, hold promising results for TB diagnosis but need optimization for early detection of TBM. Moreover, CSF IGRA is also used but unable to differentiate between active and latent TB. Overall no single test for diagnosing TBM has adequate accuracy so, there is an urgent need to devise a point-of-care test.
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Affiliation(s)
- Sonia Ahlawat
- Centre for Biotechnology, Maharshi Dayanand University (MDU) , Rohtak, India.,Amity Institute of Biotechnology, Amity University Haryana , Manesar, India
| | - Renu Chaudhary
- Council of Scientific & Industrial Research (CSIR)-institute of Genomics and Integrative Biology (IGIB) , New Delhi, India
| | - Mehak Dangi
- Department of Bioinformatics, Maharshi Dayanand University (MDU) , Rohtak, India
| | - Kiran Bala
- Department of Neurology, University of Health Sciences (UHS) , Rohtak, India
| | - Machiavelli Singh
- Amity Institute of Biotechnology, Amity University Haryana , Manesar, India
| | - Anil Kumar Chhillar
- Centre for Biotechnology, Maharshi Dayanand University (MDU) , Rohtak, India
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Akhter M, Arif S, Khaliq A, Nisa ZU, Khan IH, Akhtar MW. Designing fusion molecules from antigens of Mycobacterium tuberculosis for detection of multiple antibodies in plasma of TB patients. Tuberculosis (Edinb) 2020; 124:101981. [PMID: 32810724 DOI: 10.1016/j.tube.2020.101981] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/15/2020] [Accepted: 07/26/2020] [Indexed: 02/06/2023]
Abstract
Tuberculosis (TB) is amongst the deadliest diseases worldwide. For effective control of TB a rapid, reliable and sensitive method for its diagnosis is essential. Serodiagnosis detecting multiple antibodies against antigens of Mycobacterium tuberculosis (Mtb) in blood samples could prove beneficial. Based on the epitope position in the molecule, two truncated variants of Rv1984c, i.e., Tn1Rv1984c and Tn2Rv1984c were expressed in Escherichia coli. Screening of the Rv1984c, Tn1Rv1984c and Tn2Rv1984c against 231 sera samples from the culture positive TB patients showed sensitivities of 34.2%, 49.4% and 26.8%, respectively. Another antigen Rv1352 was analyzed for the location of epitopes, which had not been reported before. A fusion molecule consisting of Tn1Rv1984c and Rv1352, expressed in E. coli, showed enhanced sensitivity of 62.8%. Joining another antigen Rv2031c to the N-terminus of Tn1Rv1984c-Rv1352, improved sensitivity to 71.4%. The fusion construct Rv2031c-Tn1Rv1984c-Rv1352 showed comparatively higher sensitivity of 73.4% in the male group as compared to 67% in the female group. Data derived for the secondary structure analysis through Circular Dichroism (CD) spectroscopy and prediction on the basis of molecular modelling was also in agreement. This construct can be a potential base for producing constructs with greater sensitivity through fusion of epitopes from additional Mtb antigens.
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Affiliation(s)
- Mohsina Akhter
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Shaista Arif
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Aasia Khaliq
- Armed Forces Institute of Pathology, Rawalpindi, Pakistan
| | | | - Imran H Khan
- Department of Pathology and Laboratory Medicine, University of California, Davis, USA
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Bai XJ, Yang YR, Liang JQ, An HR, Wang J, Ling YB, Wang ZY, Wu XQ. Diagnostic performance and problem analysis of commercial tuberculosis antibody detection kits in China. Mil Med Res 2018; 5:10. [PMID: 29562934 PMCID: PMC5863381 DOI: 10.1186/s40779-018-0157-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 03/04/2018] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND The diagnosis of bacterium-negative pulmonary tuberculosis (TB) and extra-pulmonary TB is challenging clinically. The detection of the anti-TB antibody has an important, auxiliary, clinical diagnostic value. Therefore, TB antibody detection kits should be screened and evaluated, and the reagents with the highest sensitivity and specificity should be chosen and used clinically. METHODS The diagnostic performance of 7 commercially available TB antibody detection kits (kits A, B, C, D, E, F and G) based on the gold immunoassay detection of immunoglobulin (Ig) G or IgM antibodies were simultaneously evaluated and compared in 62 TB cases and 56 non-TB cases in a laboratory. A retrospective analysis including 2549 cases was carried out to assess the clinical diagnosis values of bacteriological examinations and TB antibody tests (kits B and H used in the clinic). RESULTS The sensitivities of TB antibody kits A, B, C, D, E, F and G in the sera from 62 TB patients were 50.0%, 83.9%, 38.7%, 9.7%, 48.4%, 69.4% and 79.0%, respectively; the sensitivities in the sera from 24 smear-negative TB patients were 29.2%, 79.2%, 29.2%, 12.5%, 29.2%, 54.2% and 79.2%, respectively; the specificities in the sera from 56 non-TB patients were 73.2%, 25.0%, 85.7%, 96.4%, 78.6%, 78.6% and 50.0%, respectively. Of the 2549 clinically diagnosed cases, there were 1752 pulmonary TB cases, 505 extra-pulmonary TB cases, 87 old pulmonary TB cases and 205 non-TB cases. The positive results for smear, culture, TB antibody kit B and kit H in pulmonary TB cases were 39.8% (543/1365), 48.6% (372/765), 45.8% (802/1752) and 25.2% (442/1752), respectively; the results in extra-pulmonary TB cases were 3.4% (6/178), 5.8% (4/69), 35.4% (179/505), and 11.3% (57/505), respectively; the results in old pulmonary TB cases were 0% (0/64), 0% (0/30), 32.2% (28/87), and 9.2% (8/87), respectively; and the results in non-TB cases were 0% (0/121), 0% (0/56), 21.5% (44/205), and 2.4% (5/205), respectively. Of 624 smear-positive and/or culture-positive pulmonary TB cases, the sensitivities of antibody test kits B and H were 53.0% and 36.4%, respectively. Of 901 smear-negative and/or culture-negative pulmonary TB cases, the sensitivities of antibody test kits B and H were 42.5% and 19.0%, respectively. The positive rate of antibody detection in the bacterium-positive pulmonary TB cases was significantly higher than that in the bacterium-negative pulmonary TB cases (P < 0.05). CONCLUSIONS The colloidal gold-labeled TB antibody IgG detection assay is a simple, rapid and economical method that provides a better clinical auxiliary diagnosis value on TB, especially in smear-negative pulmonary TB and extra-pulmonary TB. The production, quality control, screening and evaluation of antibody detection kits are very important for its clinical application.
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Affiliation(s)
- Xue-Juan Bai
- Army Tuberculosis Prevention and Control Key Laboratory, Beijing Key Laboratory of New Techniques of Tuberculosis Diagnosis and Treatment, Institute of Tuberculosis Research, 309 Hospital of Chinese PLA, Beijing, 100091, China
| | - You-Rong Yang
- Army Tuberculosis Prevention and Control Key Laboratory, Beijing Key Laboratory of New Techniques of Tuberculosis Diagnosis and Treatment, Institute of Tuberculosis Research, 309 Hospital of Chinese PLA, Beijing, 100091, China
| | - Jian-Qin Liang
- Army Tuberculosis Prevention and Control Key Laboratory, Beijing Key Laboratory of New Techniques of Tuberculosis Diagnosis and Treatment, Institute of Tuberculosis Research, 309 Hospital of Chinese PLA, Beijing, 100091, China.,Tuberculosis Department No.2. Institute of Tuberculosis Research, 309 hospital of Chinese PLA, Beijing, 100091, China
| | - Hui-Ru An
- Army Tuberculosis Prevention and Control Key Laboratory, Beijing Key Laboratory of New Techniques of Tuberculosis Diagnosis and Treatment, Institute of Tuberculosis Research, 309 Hospital of Chinese PLA, Beijing, 100091, China.,Tuberculosis Department No.1. Institute of Tuberculosis Research, 309 hospital of Chinese PLA, Beijing, 100091, China
| | - Jie Wang
- Army Tuberculosis Prevention and Control Key Laboratory, Beijing Key Laboratory of New Techniques of Tuberculosis Diagnosis and Treatment, Institute of Tuberculosis Research, 309 Hospital of Chinese PLA, Beijing, 100091, China
| | - Yan-Bo Ling
- Army Tuberculosis Prevention and Control Key Laboratory, Beijing Key Laboratory of New Techniques of Tuberculosis Diagnosis and Treatment, Institute of Tuberculosis Research, 309 Hospital of Chinese PLA, Beijing, 100091, China
| | - Zhong-Yuan Wang
- Army Tuberculosis Prevention and Control Key Laboratory, Beijing Key Laboratory of New Techniques of Tuberculosis Diagnosis and Treatment, Institute of Tuberculosis Research, 309 Hospital of Chinese PLA, Beijing, 100091, China. .,Tuberculosis Department No.3, Institute of Tuberculosis Research309 Hospital of Chinese PLA, Beijing, 100091, China.
| | - Xue-Qiong Wu
- Army Tuberculosis Prevention and Control Key Laboratory, Beijing Key Laboratory of New Techniques of Tuberculosis Diagnosis and Treatment, Institute of Tuberculosis Research, 309 Hospital of Chinese PLA, Beijing, 100091, China.
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Luo L, Zhu L, Yue J, Liu J, Liu G, Zhang X, Wang H, Xu Y. Antigens Rv0310c and Rv1255c are promising novel biomarkers for the diagnosis of Mycobacterium tuberculosis infection. Emerg Microbes Infect 2017; 6:e64. [PMID: 28698665 PMCID: PMC5567170 DOI: 10.1038/emi.2017.54] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 05/21/2017] [Accepted: 05/22/2017] [Indexed: 12/19/2022]
Abstract
This study aimed to identify novel immunogenic epitopes from Mycobacterium tuberculosis (MTB) that could be used in tuberculosis (TB) diagnostics. To determine the diagnostic potential of mycobacterial antigens in serodiagnosis of TB, 256 patients were enrolled in a study and divided into two groups: 126 smear-positive pulmonary TB patients (SPPT) and 130 smear-negative pulmonary TB patients (SNPT); 152 bacillus Calmette-Guerin (BCG)-vaccinated healthy people were used as a control. Murine results showed that antigens Rv0310c-E from RD 8 and Rv1255c-E from RD 10 were strongly immunogenic to Th1 cells and induced a great humoral response. Receiver operating characteristic analysis indicated that Rv0310c-E (area under the curve (AUC): 0.800) and Rv1255c-E (AUC: 0.808) performed better than ESAT-6 (AUC: 0.665) and CFP-10 (AUC: 0.623) proteins but were comparable with Rv3425 (AUC: 0.788) protein in a human serum IgG analysis. Rv0310c-E demonstrated the highest diagnostic ability for the SPPT group (Youden index: 0.5602, sensitivity: 69.84%, specificity: 86.18%), while Rv1255c-E demonstrated the highest diagnostic ability for the SNPT group (Youden index: 0.5674, sensitivity: 73.84%, specificity: 82.89%). In addition, combination analysis found that antigen Rv0310c-E, coupled with the Rv3425 protein (Youden index: 0.6098, sensitivity: 87.30%, specificity: 73.68%) had the strongest performance for TB diagnostics of the SPPT group, and the single antigen Rv1255c-E was strongest for the SNPT group. These results suggest that antigens Rv0310c-E and Rv1255c-E are potential antigens for TB serodiagnostic tests, which may facilitate detection of MTB in smear-negative and smear-positive patients.
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Affiliation(s)
- Liulin Luo
- State Key Laboratory of Genetic Engineering, Institute of Genetics, Fudan University, Shanghai 200433, China.,Department of Clinical Laboratory Medicine, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai 200433, China
| | - Lin Zhu
- State Key Laboratory of Genetic Engineering, Institute of Genetics, Fudan University, Shanghai 200433, China
| | - Jun Yue
- Department of Clinical Laboratory Medicine, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai 200433, China
| | - Jianping Liu
- State Key Laboratory of Genetic Engineering, Institute of Genetics, Fudan University, Shanghai 200433, China
| | - Guoyuan Liu
- State Key Laboratory of Genetic Engineering, Institute of Genetics, Fudan University, Shanghai 200433, China
| | - Xuelian Zhang
- State Key Laboratory of Genetic Engineering, Institute of Genetics, Fudan University, Shanghai 200433, China
| | - Honghai Wang
- State Key Laboratory of Genetic Engineering, Institute of Genetics, Fudan University, Shanghai 200433, China
| | - Ying Xu
- State Key Laboratory of Genetic Engineering, Institute of Genetics, Fudan University, Shanghai 200433, China
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Khurshid S, Afzal M, Khalid R, Akhtar MW, Qazi MH. Potential of multi-component antigens for tuberculosis diagnosis. Biologicals 2017; 48:109-113. [DOI: 10.1016/j.biologicals.2017.04.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 04/17/2017] [Accepted: 04/25/2017] [Indexed: 12/24/2022] Open
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Khalid R, Afzal M, Khurshid S, Paracha RZ, Khan IH, Akhtar MW. Fusion Molecules of Heat Shock Protein HSPX with Other Antigens of Mycobacterium tuberculosis Show High Potential in Serodiagnosis of Tuberculosis. PLoS One 2016; 11:e0163349. [PMID: 27654048 PMCID: PMC5031420 DOI: 10.1371/journal.pone.0163349] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Accepted: 09/07/2016] [Indexed: 12/02/2022] Open
Abstract
Variable individual response against the antigens of Mycobacterium tuberculosis necessitates detection of multiple antibodies for enhancing reliability of serodiagnosis of tuberculosis. Fusion molecules consisting of two or more antigens showing high sensitivity would be helpful in achieving this objective. Antigens of M. tuberculosis HSPX and PE35 were expressed in a soluble form whereas tnPstS1 and FbpC1 were expressed as inclusion bodies at 37°C. Heat shock protein HSPX when attached to the N-termini of the antigens PE35, tnPstS1 and FbpC1, all the fusion molecules were expressed at high levels in E. coli in a soluble form. ELISA analysis of the plasma samples of TB patients against HSPX-tnPstS1 showed 57.7% sensitivity which is nearly the same as the expected combined value obtained after deducting the number of plasma samples (32) containing the antibodies against both the individual antigens. Likewise, the 54.4% sensitivity of HSPX-PE35 was nearly the same as that expected from the combined values of the contributing antigens. Structural analysis of all the fusion molecules by CD spectroscopy showed that α-helical and β-sheet contents were found close to those obtained through molecular modeling. Molecular modeling studies of HSPX-tnPstS1 and HSPX-PE35 support the analytical results as most of the epitopes of the contributing antigens were found to be available for binding to the corresponding antibodies. Using these fusion molecules in combination with other antigenic molecules should reduce the number of antigenic proteins required for a more reliable and economical serodiagnosis of tuberculosis. Also, HSPX seems to have potential application in soluble expression of heterologous proteins in E. coli.
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Affiliation(s)
- Ruqyya Khalid
- School of Biological Sciences, Quaid-e-Azam Campus, University of the Punjab, Lahore, Pakistan
| | - Madeeha Afzal
- School of Biological Sciences, Quaid-e-Azam Campus, University of the Punjab, Lahore, Pakistan
| | - Sana Khurshid
- School of Biological Sciences, Quaid-e-Azam Campus, University of the Punjab, Lahore, Pakistan
| | - Rehan Zafar Paracha
- Atta-ur-Rehman School of Applied Biosciences, National University of Sciences and Technology, Islamabad, Pakistan
| | - Imran H. Khan
- Department of Pathology and Laboratory Medicine, University of California, Davis, California, United States of America
| | - Muhammad Waheed Akhtar
- School of Biological Sciences, Quaid-e-Azam Campus, University of the Punjab, Lahore, Pakistan
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Singh N, Sreenivas V, Sheoran A, Sharma S, Gupta KB, Khuller GK, Mehta PK. Serodiagnostic potential of immuno-PCR using a cocktail of mycobacterial antigen 85B, ESAT-6 and cord factor in tuberculosis patients. J Microbiol Methods 2016; 120:56-64. [DOI: 10.1016/j.mimet.2015.11.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 11/24/2015] [Accepted: 11/24/2015] [Indexed: 01/15/2023]
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