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Radomirović M, Gligorijević N, Stanić-Vučinić D, Rajković A, Ćirković Veličković T. Ultrasensitive Quantification of Crustacean Tropomyosin by Immuno-PCR. Int J Mol Sci 2023; 24:15410. [PMID: 37895089 PMCID: PMC10607643 DOI: 10.3390/ijms242015410] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 10/15/2023] [Accepted: 10/17/2023] [Indexed: 10/29/2023] Open
Abstract
Tropomyosin is the major and predominant allergen among shellfish. This study developed an ultrasensitive immuno-PCR method for the quantification of crustacean tropomyosin in foods. The method couples sandwich ELISA with the real-time PCR (rtPCR) amplification of marker DNAs. Monoclonal anti-TPM antibody was the capture antibody, polyclonal rabbit anti-shrimp tropomyosin antibody was the detection antibody, while natural shrimp tropomyosin served as the standard. A double-stranded amino-DNA was covalently conjugated to a secondary anti-rabbit antibody and subsequently amplified and quantified via rtPCR. The quantification sensitivity of immuno-PCR was 20-fold higher than analogous ELISA, with LOQ 19.8 pg/mL. The developed immuno-PCR method is highly specific for the detection of crustacean tropomyosin and is highly precise in a broad concentration range. Tropomyosin recovery in the spiked vegetable soup was 87.7-115.6%. Crustacean tropomyosin was also quantified in commercial food products. The reported immuno-PCR assay is the most sensitive method for the quantification of crustacean tropomyosin and is the first immuno-PCR-based assay for the quantification of food allergen and food protein in general. The described method could be easily adapted for the specific and ultrasensitive immuno-PCR-based detection of traces of any food allergen that is currently being quantified with ELISA, which is of critical importance for people with food allergies.
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Affiliation(s)
- Mirjana Radomirović
- Center of Excellence for Molecular Food Sciences and Department of Biochemistry, University of Belgrade—Faculty of Chemistry, 11000 Belgrade, Serbia; (M.R.); (D.S.-V.)
| | - Nikola Gligorijević
- Center for Chemistry, University of Belgrade—Institute of Chemistry, Technology and Metallurgy, National Institute of the Republic of Serbia, 11000 Belgrade, Serbia;
| | - Dragana Stanić-Vučinić
- Center of Excellence for Molecular Food Sciences and Department of Biochemistry, University of Belgrade—Faculty of Chemistry, 11000 Belgrade, Serbia; (M.R.); (D.S.-V.)
| | - Andreja Rajković
- Ghent University Global Campus, Ghent University, Yeonsu-gu, Incheon 406-840, Republic of Korea
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium
- Faculty of Agriculture, University of Belgrade, 11000 Belgrade, Serbia
| | - Tanja Ćirković Veličković
- Center of Excellence for Molecular Food Sciences and Department of Biochemistry, University of Belgrade—Faculty of Chemistry, 11000 Belgrade, Serbia; (M.R.); (D.S.-V.)
- Ghent University Global Campus, Ghent University, Yeonsu-gu, Incheon 406-840, Republic of Korea
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium
- Serbian Academy of Sciences and Arts, 11000 Belgrade, Serbia
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Khan A, Singh R, Sharma S, Singh V, Sheoran A, Soni A, Dhull V, Gill PS, Yadav A, Chaudhary D, Gupta MC, Mehta PK. Diagnosis of osteoarticular tuberculosis by immuno-PCR assay based on mycobacterial antigen 85 complex detection. Lett Appl Microbiol 2021; 74:17-26. [PMID: 34592012 DOI: 10.1111/lam.13567] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 04/16/2021] [Revised: 09/11/2021] [Accepted: 09/14/2021] [Indexed: 01/22/2023]
Abstract
Diagnosis of osteoarticular tuberculosis (OATB) exhibits serious challenges owing to paucibacillary nature of specimens and localization of disease at sites that are difficult to access. We recently developed indirect immuno-PCR (I-PCR) and real-time I-PCR (RT-I-PCR) assays for the detection of mycobacterial antigen 85 complex (Ag85) in OATB patients. Detection limits for the purified Ag85 protein were found to be 1 and 41 fg ml-1 by I-PCR and RT-I-PCR, respectively, which were at least 105 -fold lower than respective ELISA. While spiking synovial fluids of non-TB control subjects with the purified Ag85 protein, LODs of 100 and 120 fg ml-1 were obtained by I-PCR and RT-I-PCR, respectively, thus demonstrating the sample matrix effect. Sensitivities of 87·5 and 70·5% were observed in bodily fluids of confirmed (n = 8) and clinically suspected (n = 51) OATB cases, respectively, by I-PCR, with a specificity of 93·9% (n = 33). Markedly, the sensitivities obtained by I-PCR/RT-I-PCR were significantly higher (P < 0·05-0·01) than ELISA and GeneXpert assay (n = 30). However, no substantial difference in sensitivity was observed between the I-PCR and RT-I-PCR assays. After further improving the accuracy of I-PCR, this test may lead to development of an attractive diagnostic kit.
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Affiliation(s)
- A Khan
- Centre for Biotechnology, Maharshi Dayanand University (MDU), Rohtak, India
| | - R Singh
- Department of Orthopaedics, University of Health Sciences (UHS), Rohtak, India
| | - S Sharma
- Department of Microbiology, UHS, Rohtak, India
| | - V Singh
- Department of Biostatistics, All India Institute of Medical Sciences, New Delhi, India
| | - A Sheoran
- Department of Statistics, Ramanujan College, University of Delhi, New Delhi, India
| | - A Soni
- Centre for Biotechnology, Maharshi Dayanand University (MDU), Rohtak, India.,Department of Biotechnology, Deenbandhu Chhotu Ram University of Science and Technology Murthal, Sonepat, India
| | - V Dhull
- Department of Biotechnology Engineering, University Institute of Engineering & Technology, MDU, Rohtak, India
| | - P S Gill
- Department of Microbiology, UHS, Rohtak, India
| | - A Yadav
- Department of Microbiology, UHS, Rohtak, India
| | - D Chaudhary
- Pulmonary and Critical Care Medicine, UHS, Rohtak, India
| | - M C Gupta
- Department of Pharmacology, UHS, Rohtak, India
| | - P K Mehta
- Centre for Biotechnology, Maharshi Dayanand University (MDU), Rohtak, India
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Affiliation(s)
- Bhawna Dahiya
- Centre for Biotechnology, Maharshi Dayanand University, Rohtak, 124001, India
| | - Promod K Mehta
- Centre for Biotechnology, Maharshi Dayanand University, Rohtak, 124001, India
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Stiller C, Viktorsson K, Paz Gomero E, Hååg P, Arapi V, Kaminskyy VO, Kamali C, De Petris L, Ekman S, Lewensohn R, Karlström AE. Detection of Tumor-Associated Membrane Receptors on Extracellular Vesicles from Non-Small Cell Lung Cancer Patients via Immuno-PCR. Cancers (Basel) 2021; 13:cancers13040922. [PMID: 33671772 PMCID: PMC7926549 DOI: 10.3390/cancers13040922] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/11/2021] [Accepted: 02/18/2021] [Indexed: 12/18/2022] Open
Abstract
Simple Summary Lung cancer is often detected at late stages when metastases are present and the genomic make-ups of the tumors are heterogeneous. Analyses of genomic alterations in non-small-cell lung cancer (NSCLC) have revealed mutated tumor-associated membrane receptors and fusion proteins, which can be targeted via tyrosine kinase inhibitors (TKIs). TKIs initially often have a good effect, but a fraction of the tumor lesions may develop resistance through additional mutations in the targeted kinases or by increased expression/function of other membrane receptors. Detection of TKI-bypassing mechanisms is difficult in tissue biopsies as these analyze only a subpart of tumors or lesions. Liquid biopsies based on tumor-secreted small extracellular vesicles (sEVs) into body fluids can assess tumor heterogeneity. We present an immuno-PCR method for the detection of the epidermal growth factor receptor (EGFR), the human epidermal growth factor receptor 2 (HER2), and the insulin-like growth factor 1 receptor (IGF-1R) on sEVs. Initial investigations of sEVs from EGFR-mutant NSCLC tumor cells or pleural effusion (PE) fluid from patients with NSCLC or benign diseases showed different protein profiles for individual sEV samples. Further development of the immuno-PCR could complement DNA/mRNA-based assays detecting kinase mutations to allow longitudinal treatment monitoring of diverse TKI-bypassing mechanisms. Abstract Precision cancer medicine for non-small-cell lung cancer (NSCLC) has increased patient survival. Nevertheless, targeted agents towards tumor-associated membrane receptors only result in partial remission for a limited time, calling for approaches which allow longitudinal treatment monitoring. Rebiopsy of tumors in the lung is challenging, and metastatic lesions may have heterogeneous signaling. One way ahead is to use liquid biopsies such as circulating tumor DNA or small extracellular vesicles (sEVs) secreted by the tumor into blood or other body fluids. Herein, an immuno-PCR-based detection of the tumor-associated membrane receptors EGFR, HER2, and IGF-1R on CD9-positive sEVs from NSCLC cells and pleural effusion fluid (PE) of NSCLC patients is developed utilizing DNA conjugates of antibody mimetics and affibodies, as detection agents. Results on sEVs purified from culture media of NSCLC cells treated with anti-EGFR siRNA, showed that the reduction of EGFR expression can be detected via immuno-PCR. Protein profiling of sEVs from NSCLC patient PE samples revealed the capacity to monitor EGFR, HER2, and IGF-1R with the immuno-PCR method. We detected a significantly higher EGFR level in sEVs derived from a PE sample of a patient with an EGFR-driven NSCLC adenocarcinoma than in sEVs from PE samples of non-EGFR driven adenocarcinoma patients or in samples from patients with benign lung disease. In summary, we have developed a diagnostic method for sEVs in liquid biopsies of cancer patients which may be used for longitudinal treatment monitoring to detect emerging bypassing resistance mechanisms in a noninvasive way.
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Affiliation(s)
- Christiane Stiller
- Department of Protein Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Center, SE-10691 Stockholm, Sweden; (C.S.); (E.P.G.)
- Biomedical Centre, Department of Pharmaceutical Biosciences, Uppsala University, SE-75123 Uppsala, Sweden
| | - Kristina Viktorsson
- Department of Oncology-Pathology, Karolinska Institutet, SE-17177 Stockholm, Sweden; (K.V.); (P.H.); (V.A.); (V.O.K.); (C.K.); (L.D.P.); (S.E.); (R.L.)
| | - Elizabeth Paz Gomero
- Department of Protein Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Center, SE-10691 Stockholm, Sweden; (C.S.); (E.P.G.)
| | - Petra Hååg
- Department of Oncology-Pathology, Karolinska Institutet, SE-17177 Stockholm, Sweden; (K.V.); (P.H.); (V.A.); (V.O.K.); (C.K.); (L.D.P.); (S.E.); (R.L.)
| | - Vasiliki Arapi
- Department of Oncology-Pathology, Karolinska Institutet, SE-17177 Stockholm, Sweden; (K.V.); (P.H.); (V.A.); (V.O.K.); (C.K.); (L.D.P.); (S.E.); (R.L.)
| | - Vitaliy O. Kaminskyy
- Department of Oncology-Pathology, Karolinska Institutet, SE-17177 Stockholm, Sweden; (K.V.); (P.H.); (V.A.); (V.O.K.); (C.K.); (L.D.P.); (S.E.); (R.L.)
| | - Caroline Kamali
- Department of Oncology-Pathology, Karolinska Institutet, SE-17177 Stockholm, Sweden; (K.V.); (P.H.); (V.A.); (V.O.K.); (C.K.); (L.D.P.); (S.E.); (R.L.)
- Theme Cancer, Medical Unit Head and Neck, Lung, and Skin Tumors, Thoracic Oncology Center, Karolinska University Hospital, SE-17177 Stockholm, Sweden
| | - Luigi De Petris
- Department of Oncology-Pathology, Karolinska Institutet, SE-17177 Stockholm, Sweden; (K.V.); (P.H.); (V.A.); (V.O.K.); (C.K.); (L.D.P.); (S.E.); (R.L.)
- Theme Cancer, Medical Unit Head and Neck, Lung, and Skin Tumors, Thoracic Oncology Center, Karolinska University Hospital, SE-17177 Stockholm, Sweden
| | - Simon Ekman
- Department of Oncology-Pathology, Karolinska Institutet, SE-17177 Stockholm, Sweden; (K.V.); (P.H.); (V.A.); (V.O.K.); (C.K.); (L.D.P.); (S.E.); (R.L.)
- Theme Cancer, Medical Unit Head and Neck, Lung, and Skin Tumors, Thoracic Oncology Center, Karolinska University Hospital, SE-17177 Stockholm, Sweden
| | - Rolf Lewensohn
- Department of Oncology-Pathology, Karolinska Institutet, SE-17177 Stockholm, Sweden; (K.V.); (P.H.); (V.A.); (V.O.K.); (C.K.); (L.D.P.); (S.E.); (R.L.)
- Theme Cancer, Medical Unit Head and Neck, Lung, and Skin Tumors, Thoracic Oncology Center, Karolinska University Hospital, SE-17177 Stockholm, Sweden
| | - Amelie Eriksson Karlström
- Department of Protein Science, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, AlbaNova University Center, SE-10691 Stockholm, Sweden; (C.S.); (E.P.G.)
- Correspondence: ; Tel.: +46-8-790-99-78
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Dahiya B, Khan A, Mor P, Kamra E, Singh N, Gupta KB, Sheoran A, Sreenivas V, Mehta PK. Detection of Mycobacterium tuberculosis lipoarabinomannan and CFP-10 (Rv3874) from urinary extracellular vesicles of tuberculosis patients by immuno-PCR. Pathog Dis 2020; 77:5565047. [PMID: 31549171 DOI: 10.1093/femspd/ftz049] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [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: 04/19/2019] [Accepted: 09/05/2019] [Indexed: 12/17/2022] Open
Abstract
Extracellular vesicles (EVs), the small circulating vesicles released from urine samples of tuberculosis (TB) patients, contain a pool of biomarkers. We recently detected Mycobacterium tuberculosis lipoarabinomannan (LAM) and CFP-10 (Rv3874) biomarkers from the urinary EVs of pulmonary TB (PTB) and extrapulmonary TB (EPTB) patients by immuno-polymerase chain reaction (I-PCR) assay and the results were compared with the analogous enzyme-linked immunosorbent assay (ELISA). The detection limits of both purified LAM and CFP-10 were determined to be 1 fg/mL with I-PCR, which was 106 times lower than ELISA. Detection of LAM and CFP-10 biomarkers in urinary EVs of TB patients by I-PCR showed superiority over ELISA. Notably, LAM I-PCR revealed sensitivities of 74.3 and 67.9% in PTB (n = 74) and EPTB (n = 53) patients, respectively, with specificities of 91.5-92.8% (n = 116). Moreover, the sensitivities attained with LAM I-PCR were significantly higher (P < 0.01) than with CFP-10 I-PCR. After further improving the sensitivity and specificity of the assay, our I-PCR based on LAM detection in urinary EVs may be used as an adjunct test for rapid diagnosis of TB.
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Affiliation(s)
- Bhawna Dahiya
- Centre for Biotechnology, Maharshi Dayanand University (MDU), Rohtak-124001 (Haryana), India
| | - Anish Khan
- Centre for Biotechnology, Maharshi Dayanand University (MDU), Rohtak-124001 (Haryana), India
| | - Preeti Mor
- Centre for Biotechnology, Maharshi Dayanand University (MDU), Rohtak-124001 (Haryana), India
| | - Ekta Kamra
- Centre for Biotechnology, Maharshi Dayanand University (MDU), Rohtak-124001 (Haryana), India
| | - Netrapal Singh
- Centre for Biotechnology, Maharshi Dayanand University (MDU), Rohtak-124001 (Haryana), India
| | - Krishna B Gupta
- Department of TB & Respiratory Medicine, University of Health Sciences (UHS), Rohtak-124001, India
| | - Abhishek Sheoran
- Department of Statistics, Ramanujan College, University of Delhi, New Delhi-110019, India
| | - Vishnubhatla Sreenivas
- Department of Biostatistics, All India Institute of Medical Sciences, New Delhi-110029, India
| | - Promod K Mehta
- Centre for Biotechnology, Maharshi Dayanand University (MDU), Rohtak-124001 (Haryana), India
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Jalili R, Horecka J, Swartz JR, Davis RW, Persson HHJ. Streamlined circular proximity ligation assay provides high stringency and compatibility with low-affinity antibodies. Proc Natl Acad Sci U S A 2018; 115:E925-33. [PMID: 29339495 DOI: 10.1073/pnas.1718283115] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Proximity ligation assay (PLA) is a powerful tool for quantitative detection of protein biomarkers in biological fluids and tissues. Here, we present the circular proximity ligation assay (c-PLA), a highly specific protein detection method that outperforms traditional PLA in stringency, ease of use, and compatibility with low-affinity reagents. In c-PLA, two proximity probes bind to an analyte, providing a scaffolding that positions two free oligonucleotides such that they can be ligated into a circular DNA molecule. This assay format stabilizes antigen proximity probe complexes and enhances stringency by reducing the probability of random background ligation events. Circle formation also increases selectivity, since the uncircularized DNA can be removed enzymatically. We compare this method with traditional PLA on several biomarkers and show that the higher stringency for c-PLA improves reproducibility and enhances sensitivity in both buffer and human plasma. The limit of detection ranges from femtomolar to nanomolar concentrations for both methods. Kinetic analyses using surface plasmon resonance (SPR) and biolayer interferometry (BLI) reveal that the variation in limit of detection is due to the variation in antibody affinity and that c-PLA outperforms traditional PLA for low-affinity antibodies. The lower background signal can be used to increase proximity probe concentration while maintaining a high signal-to-noise ratio, thereby enabling the use of low-affinity reagents in a homogeneous assay format. We anticipate that the advantages of c-PLA will be useful in a variety of clinical protein detection applications where high-affinity reagents are lacking.
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Mu J, Andersen JF, Valenzuela JG, Wellems TE. High-Sensitivity Assays for Plasmodium falciparum Infection by Immuno-Polymerase Chain Reaction Detection of PfIDEh and PfLDH Antigens. J Infect Dis 2017; 216:713-722. [PMID: 28934434 DOI: 10.1093/infdis/jix369] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 04/05/2017] [Accepted: 07/27/2017] [Indexed: 01/26/2023] Open
Abstract
Background Rapid diagnostic tests based on Plasmodium falciparum histidine-rich protein II (PfHRP-II) and P. falciparum lactate dehydrogenase (PfLDH) antigens are widely deployed for detection of P. falciparum infection; however, these tests often miss cases of low-level parasitemia, and PfHRP-II tests can give false-negative results when P. falciparum strains do not express this antigen. Methods We screened proteomic data for highly expressed P. falciparum proteins and compared their features to those of PfHRP-II and PfLDH biomarkers. Search criteria included high levels of expression, conservation in all parasite strains, and good correlation of antigen levels with parasitemia and its clearance after drug treatment. Different assay methods were compared for sensitive detection of parasitemia in P. falciparum cultures. Results Among potential new biomarkers, a P. falciparum homolog of insulin-degrading enzyme (PfIDEh) met our search criteria. Comparative enzyme-linked immunosorbent assays with monoclonal antibodies against PfLDH or PfIDEh showed detection limits of 100-200 parasites/µL and 200-400 parasites/µL, respectively. Detection was dramatically improved by use of real-time immuno-polymerase chain reaction (PCR), to parasitemia limits of 0.02 parasite/µL and 0.78 parasite/µL in PfLDH- and PfIDEh-based assays, respectively. Conclusions The ability of PfLDH- or PfIDEh-based immuno-PCR assays to detect <1 parasite/µL suggests that improvements of bound antibody sensor technology may greatly increase the sensitivity of malaria rapid diagnostic tests.
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Affiliation(s)
- Jianbing Mu
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland
| | - John F Andersen
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland
| | - Jesus G Valenzuela
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland
| | - Thomas E Wellems
- Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland
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Kolesnikov AV, Kozyr AV, Ryabko AK, Shemyakin IG. Ultrasensitive detection of protease activity of anthrax and botulinum toxins by a new PCR-based assay. Pathog Dis 2015; 74:ftv112. [PMID: 26620058 DOI: 10.1093/femspd/ftv112] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/24/2015] [Indexed: 11/14/2022] Open
Abstract
Anthrax and botulism are dangerous infectious diseases that can be fatal unless detected and treated quickly. Fatalities from these diseases are primarily due to endopeptidase toxins secreted by the pathogens. Rapid and sensitive detection of the presence of active toxins is the key element for protection from natural outbreaks of anthrax and botulism, as well as from the threat of bioterrorism. We describe an ultrasensitive polymerase chain reaction (PCR)-based assay for detecting proteolytic activity of anthrax and botulinum toxins using composite probes consisting of covalent peptide-DNA conjugate for the detection of anthrax, and noncovalent protein-aptamer assembly to assay botulinum toxin activity. Probes immobilized on the solid-phase support are cleaved by toxins to release DNA, which is detected by real-time PCR. Both assays can detect subpicogram quantities of active toxins isolated from composite matrices. Special procedures were developed to isolate intact toxins from the matrices under mild conditions. The assay is rapid, uses proven technologies, and can be modified to detect other proteolytic and biopolymer-degrading enzymes.
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Affiliation(s)
- Alexander V Kolesnikov
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region 142279, Russia Institute of Immunological Engineering, Lyubuchany, Moscow Region 142380, Russia
| | - Arina V Kozyr
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region 142279, Russia
| | - Alyona K Ryabko
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region 142279, Russia
| | - Igor G Shemyakin
- State Research Center for Applied Microbiology and Biotechnology, Obolensk, Moscow Region 142279, Russia
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Gaudet D, Nilsson D, Lohr T, Sheedy C. Development of a real-time immuno-PCR assay for the quantification of 17β-estradiol in water. J Environ Sci Health B 2015; 50:683-690. [PMID: 26273752 DOI: 10.1080/03601234.2015.1048097] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A competitive real-time (RT) immuno-polymerase chain reaction (iPCR) (RT-iPCR) assay was developed for the sensitive quantification of 17β-estradiol in water. Using a universal iPCR method and polyclonal antibodies, 17β-estradiol was accurately quantified at concentrations ranging from 1 pg mL(-1) to 10 µg mL(-1). The RT-iPCR assay's limit of detection was 0.7 pg mL(-1). The RT-iPCR assay provided an 800-fold increase in sensitivity as well as an expanded working range compared with the corresponding enzyme-linked immunosorbent assay. Assay cross-reactivity to estrone and estriol, two structurally related estrogens, was below 8%. Water samples spiked with 17β-estradiol were analyzed by RT-iPCR to determine the assay's potential as a rapid screen for the monitoring of manure-borne estrogens in the environment. The assay showed recoveries of 82, 102 and 103% for Milli-Q, tap, and irrigation water, respectively, without requiring sample extraction or concentration prior to analysis.
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Affiliation(s)
- Daniel Gaudet
- a Agriculture and Agri-Food Canada , Lethbridge , Canada
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Kasai N, Kobayashi K, Shioya S, Yoshikawa Y, Yotsumoto F, Miyamoto S, Mekada E, Enokizono J. Soluble heparin-binding EGF-like growth factor (HB-EGF) detected by newly developed immuno-PCR method is a clear-cut serological biomarker for ovarian cancer. Am J Transl Res 2012; 4:415-421. [PMID: 23145209 PMCID: PMC3493029] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Accepted: 09/23/2012] [Indexed: 06/01/2023]
Abstract
Heparin-binding EGF-like growth factor (HB-EGF) is a member of the EGF family of growth factors that bind to and activate the EGF receptor. HB-EGF is synthesized as a membrane-anchored protein (proHB-EGF), and then proteolytically cleaved, resulting in the mitogenically active soluble form. HB-EGF plays pivotal roles in pathophysiological processes such as development and cell proliferation. In this study, we developed an immuno-PCR system for the determination of soluble HB-EGF concentrations in human serum. Utilizing a monoclonal antibody with neutralizing activity against HB-EGF as a capture antibody resulted in increasing selectivity for an active form of HB-EGF in serum, and immuno-PCR system improved its sensitivity compared to the currently available methods. As a result of measurement of HB-EGF in 20 ovarian cancer patients and 20 healthy volunteers, ovarian cancer patients showed significantly higher concentrations than healthy volunteers (P< 0.05), which indicates that soluble HB-EGF detected by newly developed immuno-PCR system can be useful serological biomarkers such as a diagnostic biomarker for ovarian cancer, and a predictive and pharmacodynamic biomarker for anti-HB-EGF targeted therapies under development.
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Affiliation(s)
- Noriyuki Kasai
- Pharmacokinetic Research Laboratories, Kyowa Hakko Kirin Co. Ltd.1188, Shimotogari, Nagaizumi-cho, Suntogun, Shizuoka, 411-8731, Japan
| | - Kazuhiro Kobayashi
- Pharmacokinetic Research Laboratories, Kyowa Hakko Kirin Co. Ltd.1188, Shimotogari, Nagaizumi-cho, Suntogun, Shizuoka, 411-8731, Japan
| | - Shinobu Shioya
- Pharmacokinetic Research Laboratories, Kyowa Hakko Kirin Co. Ltd.1188, Shimotogari, Nagaizumi-cho, Suntogun, Shizuoka, 411-8731, Japan
| | - Yukitaka Yoshikawa
- Pharmacokinetic Research Laboratories, Kyowa Hakko Kirin Co. Ltd.1188, Shimotogari, Nagaizumi-cho, Suntogun, Shizuoka, 411-8731, Japan
| | - Fusanori Yotsumoto
- Department of Obstetrics and Gynecology, School of Medicine, Fukuoka University45-1, 7-Chome Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Shingo Miyamoto
- Department of Obstetrics and Gynecology, School of Medicine, Fukuoka University45-1, 7-Chome Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Eisuke Mekada
- Research Institute for Microbial Diseases, Osaka University3-1, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Junichi Enokizono
- Pharmacokinetic Research Laboratories, Kyowa Hakko Kirin Co. Ltd.1188, Shimotogari, Nagaizumi-cho, Suntogun, Shizuoka, 411-8731, Japan
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Abstract
Sensitive and rapid detection of botulinum neurotoxins (BoNTs), the most poisonous substances known to date, is essential for studies of medical applications of BoNTs and detection of poisoned food, as well as for response to potential bioterrorist threats. Currently, the most common method of BoNT detection is the mouse bioassay. While this assay is sensitive, it is slow, quite expensive, has limited throughput and requires sacrificing animals. Herein, we discuss and compare recently developed alternative in vitro detection methods and assess their ability to supplement or replace the mouse bioassay in the analysis of complex matrix samples.
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Affiliation(s)
- Petr Čapek
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA;
| | - Tobin J. Dickerson
- Department of Chemistry and Worm Institute for Research and Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
- Author to whom correspondence should be addressed; ; Tel.: +1-858-784-2522; Fax: +1-858-784-2590
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Čapek P, Dickerson TJ. Sensing the deadliest toxin: technologies for botulinum neurotoxin detection. Toxins (Basel) 2010; 2:24-53. [PMID: 22069545 PMCID: PMC3206617 DOI: 10.3390/toxins2020024] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Revised: 12/17/2009] [Accepted: 12/22/2009] [Indexed: 11/16/2022] Open
Abstract
Sensitive and rapid detection of botulinum neurotoxins (BoNTs), the most poisonous substances known to date, is essential for studies of medical applications of BoNTs and detection of poisoned food, as well as for response to potential bioterrorist threats. Currently, the most common method of BoNT detection is the mouse bioassay. While this assay is sensitive, it is slow, quite expensive, has limited throughput and requires sacrificing animals. Herein, we discuss and compare recently developed alternative in vitro detection methods and assess their ability to supplement or replace the mouse bioassay in the analysis of complex matrix samples.
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Affiliation(s)
- Petr Čapek
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA;
| | - Tobin J. Dickerson
- Department of Chemistry and Worm Institute for Research and Medicine, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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