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Téblick L, Lipovac M, Bell M, De Smet A, De Meester I, Delputte P, Vorsters A. Stability, enrichment, and quantification of total and HPV16-specific IgG present in first-void urine. Sci Rep 2024; 14:14441. [PMID: 38910149 PMCID: PMC11194269 DOI: 10.1038/s41598-024-65257-0] [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: 11/30/2023] [Accepted: 06/18/2024] [Indexed: 06/25/2024] Open
Abstract
First-void urine (FVU) samples, containing human papillomavirus (HPV)-specific IgG from female genital tract secretions, provide a non-invasive option for disease monitoring and vaccine impact assessment. This study explores the utility of FVU for IgG quantification, exploring stability and compatibility with DNA preservation methods, alongside various IgG enrichment methods. Healthy female volunteers provided FVU and serum samples. FVU was collected with or without urine conservation medium (UCM) and stored under different conditions before freezing at -80 °C. Four IgG enrichment methods were tested on FVU samples. All samples were analyzed using three total human IgG quantification assays and an in-house HPV16-specific IgG assay. Samples stored with UCM buffer had higher total and HPV16-specific IgG concentrations (p ≤ 0.01) and IgG remained stable for at least 14 days at room temperature. Among IgG enrichment methods, Amicon filtration (AM) and AM combined with Melon Gel purification (AM-MG) provided similar HPV16-IgG concentrations, correlating strongly with serum levels. Protein G magnetic beads methods were incompatible with time-resolved fluorescence-based assays. This study highlights FVU as a reliable and convenient sample for IgG quantification, demonstrating stability for at least 14 days at room temperature and compatibility with UCM DNA preservation. It emphasizes the need to select appropriate IgG enrichment methods and confirms the suitability of both AM and AM-MG methods, with a slightly better performance for AM-MG.
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Affiliation(s)
- Laura Téblick
- Centre for the Evaluation of Vaccination (CEV), Vaccine & Infectious Disease Institute (VAXINFECTIO), Faculty of Medicine and Health Sciences, University of Antwerp, 2610, Wilrijk-Antwerp, Belgium.
| | - Marijana Lipovac
- Centre for the Evaluation of Vaccination (CEV), Vaccine & Infectious Disease Institute (VAXINFECTIO), Faculty of Medicine and Health Sciences, University of Antwerp, 2610, Wilrijk-Antwerp, Belgium
| | - Margo Bell
- Centre for the Evaluation of Vaccination (CEV), Vaccine & Infectious Disease Institute (VAXINFECTIO), Faculty of Medicine and Health Sciences, University of Antwerp, 2610, Wilrijk-Antwerp, Belgium
| | - Annemie De Smet
- Centre for the Evaluation of Vaccination (CEV), Vaccine & Infectious Disease Institute (VAXINFECTIO), Faculty of Medicine and Health Sciences, University of Antwerp, 2610, Wilrijk-Antwerp, Belgium
| | - Ingrid De Meester
- Laboratory of Medical Biochemistry, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, 2610, Wilrijk-Antwerp, Belgium
| | - Peter Delputte
- Laboratory for Microbiology, Parasitology and Hygiene (LMPH), Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, 2610, Wilrijk-Antwerp, Belgium
| | - Alex Vorsters
- Centre for the Evaluation of Vaccination (CEV), Vaccine & Infectious Disease Institute (VAXINFECTIO), Faculty of Medicine and Health Sciences, University of Antwerp, 2610, Wilrijk-Antwerp, Belgium
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2
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Koussiouris J, Chandran V. Autoantibodies in psoriatic disease. Adv Clin Chem 2023; 115:135-174. [PMID: 37673519 DOI: 10.1016/bs.acc.2023.03.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
Psoriasis is an inflammatory skin disease affecting over 8 million people in the US and Canada. Approximately, a quarter of psoriasis patients have an inflammatory arthritis termed psoriatic arthritis (PsA). Psoriatic disease encompassing both psoriasis and PsA is regarded as an immune-mediated inflammatory disease, exhibiting both autoimmune and autoinflammatory features. A review of the current literature on the presence and clinical significance of autoantibodies found in psoriatic disease are presented. The frequency of several autoantibodies in psoriasis and PsA patients as well as their clinical significance regarding disease diagnosis, disease activity and treatment response are reviewed. Additionally, the basic principles of antibody assays are presented, and the methods used for each study are analyzed. Despite historically described as a rheumatoid factor negative (seronegative) disease, an array of autoantibodies has been identified in patients with psoriatic disease. This points to an autoimmune component potentially playing a role in psoriatic disease; however, additional evidence is needed to determine the clinical utility of these autoantibodies.
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Affiliation(s)
- John Koussiouris
- Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, ON, Canada; Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
| | - Vinod Chandran
- Schroeder Arthritis Institute, Krembil Research Institute, University Health Network, Toronto, ON, Canada; Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada; Division of Rheumatology, Department of Medicine, University of Toronto, Toronto, ON, Canada; Institute of Medical Science, University of Toronto, Toronto, ON, Canada; Department of Medicine, Memorial University, St. John's, NL, Canada.
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3
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Zhang Y, Wang Z, Wang W, Yu H, Jin M. Applications of polymerase chain reaction‑based methods for the diagnosis of plague (Review). Exp Ther Med 2022; 24:511. [DOI: 10.3892/etm.2022.11438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 04/22/2022] [Indexed: 11/05/2022] Open
Affiliation(s)
- Yanan Zhang
- Inner Mongolia Key Laboratory of Disease‑Related Biomarkers, Baotou Medical College, Baotou, Inner Mongolia 014060, P.R. China
| | - Zhanli Wang
- Inner Mongolia Key Laboratory of Disease‑Related Biomarkers, Baotou Medical College, Baotou, Inner Mongolia 014060, P.R. China
| | - Wenrui Wang
- General Center for Disease Control and Prevention of Inner Mongolia Autonomous Region, Huhehot, Inner Mongolia 010031, P.R. China
| | - Hui Yu
- Inner Mongolia Key Laboratory of Disease‑Related Biomarkers, Baotou Medical College, Baotou, Inner Mongolia 014060, P.R. China
| | - Min Jin
- Inner Mongolia Key Laboratory of Disease‑Related Biomarkers, Baotou Medical College, Baotou, Inner Mongolia 014060, P.R. China
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Kim KR, Han YD, Chun HJ, Lee KW, Hong DK, Lee KN, C Yoon H. Encapsulation-Stabilized, Europium Containing Nanoparticle as a Probe for Time-Resolved luminescence Detection of Cardiac Troponin I. BIOSENSORS 2017; 7:E48. [PMID: 29057816 PMCID: PMC5746771 DOI: 10.3390/bios7040048] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 10/07/2017] [Accepted: 10/16/2017] [Indexed: 12/17/2022]
Abstract
The use of a robust optical signaling probe with a high signal-to-noise ratio is important in the development of immunoassays. Lanthanide chelates are a promising material for this purpose, which provide time-resolved luminescence (TRL) due to their large Stokes shift and long luminescence lifetime. From this, they have attracted considerable interest in the in vitro diagnostics field. However, the direct use of lanthanide chelates is limited because their luminescent signal can be easily affected by various quenchers. To overcome this drawback, strategies that rely on the entrapment of lanthanide chelates inside nanoparticles, thereby enabling the protection of the lanthanide chelate from water, have been reported. However, the poor stability of the lanthanide-entrapped nanoparticles results in a significant fluctuation in TRL signal intensity, and this still remains a challenging issue. To address this, we have developed a Lanthanide chelate-Encapsulated Silica Nano Particle (LESNP) as a new immunosensing probe. In this approach, the lanthanide chelate is covalently crosslinked within the silane monomer during the silica nanoparticle formation. The resulting LESNP is physically stable and retains TRL properties of the parent lanthanide chelate. Using the probe, a highly sensitive, sandwich-based TRL immunoassay for the cardiac troponin I was conducted, exhibiting a limit of detection of 48 pg/mL. On the basis of the features of the LESNP such as TRL signaling capability, stability, and the ease of biofunctionalization, we expect that the LESNP can be widely applied in the development of TRL-based immunosensing.
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Affiliation(s)
- Ka Ram Kim
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
| | - Yong Duk Han
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
| | - Hyeong Jin Chun
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
| | - Kyung Won Lee
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
| | - Dong-Ki Hong
- Korea Electronics Technology Institute, Seongnam 13509, Korea.
| | - Kook-Nyung Lee
- Korea Electronics Technology Institute, Seongnam 13509, Korea.
| | - Hyun C Yoon
- Department of Molecular Science & Technology, Ajou University, Suwon 16499, Korea.
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Faschinger F, Ertl M, Zimmermann M, Horner A, Himmelsbach M, Schöfberger W, Knör G, Gruber HJ. Stable Europium(III) Complexes with Short Linkers for Site-Specific Labeling of Biomolecules. ChemistryOpen 2017; 6:721-732. [PMID: 29226060 PMCID: PMC5715356 DOI: 10.1002/open.201700122] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Indexed: 02/02/2023] Open
Abstract
In this study, two new terpyridine-based EuIII complexes were synthesized, the structures of which were optimized for luminescence resonance energy-transfer (LRET) experiments. The complexes showed high quantum yields (32 %); a single long lifetime (1.25 ms), which was not influenced by coupling to protein; very high stability in the presence of chelators such as ethylenediamine-N,N,N',N'-tetraacetate and ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid; and no interaction with cofactors such as adenosine triphosphate and guanosine triphosphate. A special feature is the short length of the linker between the EuIII ion and the maleimide or hydrazide function, which allows for site-specific coupling of cysteine mutants or unnatural keto amino acids. As a consequence, the new complexes appear particularly suited for accurate distance measurements in biomolecules by LRET.
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Affiliation(s)
- Felix Faschinger
- Institute of BiophysicsJohannes Kepler University LinzGruber Straße 404040LinzAustria
| | - Martin Ertl
- Institute of Inorganic ChemistryJohannes Kepler University LinzAltenberger Straße 694040LinzAustria
| | - Mirjam Zimmermann
- Institute of BiophysicsJohannes Kepler University LinzGruber Straße 404040LinzAustria
| | - Andreas Horner
- Institute of BiophysicsJohannes Kepler University LinzGruber Straße 404040LinzAustria
| | - Markus Himmelsbach
- Institute for Analytical ChemistryJohannes Kepler University LinzAltenberger Straße 694040LinzAustria
| | - Wolfgang Schöfberger
- Institute of Organic ChemistryJohannes Kepler University LinzAltenberger Straße 694040LinzAustria
| | - Günther Knör
- Institute of Inorganic ChemistryJohannes Kepler University LinzAltenberger Straße 694040LinzAustria
| | - Hermann J. Gruber
- Institute of BiophysicsJohannes Kepler University LinzGruber Straße 404040LinzAustria
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6
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Yi SY, Lee U, Chung BH, Jung J. A scanometric antibody probe for facile and sensitive immunoassays. Chem Commun (Camb) 2016; 51:8865-7. [PMID: 25926018 DOI: 10.1039/c5cc02838h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We have developed a novel scanometric antibody probe for rapid, sensitive, and naked-eye-visible immunoassays. Using this probe, we clearly demonstrated the successful scanometric detection and identification of influenza A viruses on a microarray. In addition, the sensitivity of the scanometric immunoassay was comparable to that of the fluorescence-based method.
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Affiliation(s)
- So Yeon Yi
- BioNanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, 305-806, Daejeon, Republic of Korea.
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7
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Sachdeva A, Singh AK, Sharma SK. An electrochemiluminescence assay for the detection of bio threat agents in selected food matrices and in the screening of Clostridium botulinum outbreak strains associated with type A botulism. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2014; 94:707-712. [PMID: 23873138 DOI: 10.1002/jsfa.6310] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 05/02/2013] [Accepted: 07/19/2013] [Indexed: 06/02/2023]
Abstract
BACKGROUND Specific screening methods for complex food matrices are needed that enable unambiguous and sensitive detection of bio threat agents (BTAs) such as Bacillus anthracis spores and microbial toxins (e.g. staphylococcal enterotoxin B (SEB) and clostridial botulinum neurotoxins (BoNTs)). The present study describes an image-based 96-well Meso Scale Discovery (MSD) electrochemiluminescence (ECL) assay for simultaneous detection of BTAs in dairy milk products. RESULTS The limit of detection of this ECL assay is 40 pg mL⁻¹ for BoNT/A complex, 10 pg mL⁻¹ for SEB and 40000 CFU mL⁻¹ for Bacillus anthracis spores in dairy milk products. The ECL assay was successfully applied to screen type A Clostridium botulinum outbreak strains. CONCLUSION The results of the study indicate that this ECL assay is very sensitive, rapid (<6 h) and multiplex in nature. The ECL assay has potential for use as an in vitro screening method for BTAs over other comparable immunoassays.
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Affiliation(s)
- Amita Sachdeva
- Division of Microbiology, Office of Regulatory Science, Center for Food Safety and Applied Nutrition, US Food and Drug Administration, 5100 Paint Branch Parkway, College Park, MD, 20740, USA
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8
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Vuojola J, Soukka T. Luminescent lanthanide reporters: new concepts for use in bioanalytical applications. Methods Appl Fluoresc 2014; 2:012001. [DOI: 10.1088/2050-6120/2/1/012001] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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9
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Menon VK, George S, Aladin F, Nawaz S, Sarkar R, Lopman B, Gray JJ, Gomara MI, Kang G. Comparison of age-stratified seroprevalence of antibodies against norovirus GII in India and the United Kingdom. PLoS One 2013; 8:e56239. [PMID: 23437102 PMCID: PMC3578856 DOI: 10.1371/journal.pone.0056239] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 01/09/2013] [Indexed: 02/07/2023] Open
Abstract
Noroviruses are a common cause of gastroenteritis worldwide, but outbreaks appear to be more common in industrialized countries than in developing countries, possibly reflecting differences in exposure and immunity. In this study, age-stratified sera from India and UK populations were analysed for the presence of norovirus-genogroup II specific IgG by a time resolved immunofluorescence assay and relative levels of antibodies in the two populations were compared. Antibody levels were higher among all age groups in India than in UK and increased with age in India, whereas in the UK, levels of antibody decreased in adulthood. These results indicate different patterns of exposure to noroviruses in the two countries.
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Affiliation(s)
- Vipin Kumar Menon
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| | - Santosh George
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| | - Farah Aladin
- Virus Reference Department, Centre for Infection, Health Protection Agency, London, United Kingdom
| | - Sameena Nawaz
- Virus Reference Department, Centre for Infection, Health Protection Agency, London, United Kingdom
| | - Rajiv Sarkar
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
| | - Ben Lopman
- Division of Viral Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - James J. Gray
- Norfolk and Norwich University Hospital Specialist Virology Centre, Microbiology Department, NRP Innovation Centre, Norwich, United Kingdom
| | - Miren Iturriza Gomara
- Department of Clinical Infection, Microbiology and Immunology, Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
| | - Gagandeep Kang
- Department of Gastrointestinal Sciences, Christian Medical College, Vellore, India
- * E-mail:
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10
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Zherdeva VV, Savitsky AP. Using lanthanide-based resonance energy transfer for in vitro and in vivo studies of biological processes. BIOCHEMISTRY (MOSCOW) 2013; 77:1553-74. [DOI: 10.1134/s0006297912130111] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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11
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Orlov AV, Khodakova JA, Nikitin MP, Shepelyakovskaya AO, Brovko FA, Laman AG, Grishin EV, Nikitin PI. Magnetic Immunoassay for Detection of Staphylococcal Toxins in Complex Media. Anal Chem 2012; 85:1154-63. [DOI: 10.1021/ac303075b] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexey V. Orlov
- A. M. Prokhorov General Physics
Institute, Russian Academy of Sciences,
38 Vavilova St. Moscow 119991 Russia
- Moscow Institute of Physics and Technology, Moscow, Russia
| | - Julia A. Khodakova
- A. M. Prokhorov General Physics
Institute, Russian Academy of Sciences,
38 Vavilova St. Moscow 119991 Russia
| | - Maxim P. Nikitin
- A. M. Prokhorov General Physics
Institute, Russian Academy of Sciences,
38 Vavilova St. Moscow 119991 Russia
- Moscow Institute of Physics and Technology, Moscow, Russia
- Shemyakin-Ovchinnikov Institute
of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Anna O. Shepelyakovskaya
- Pushchino
Branch of Shemyakin-Ovchinnikov
Institute of Bioorganic Chemistry, Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | - Fedor A. Brovko
- Pushchino
Branch of Shemyakin-Ovchinnikov
Institute of Bioorganic Chemistry, Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | - Alexander G. Laman
- Pushchino
Branch of Shemyakin-Ovchinnikov
Institute of Bioorganic Chemistry, Russian Academy of Sciences, Pushchino, Moscow Region, Russia
| | - Evgeny V. Grishin
- Shemyakin-Ovchinnikov Institute
of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | - Petr I. Nikitin
- A. M. Prokhorov General Physics
Institute, Russian Academy of Sciences,
38 Vavilova St. Moscow 119991 Russia
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12
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Zhang W, Ang WT, Xue CY, Yang KL. Minimizing nonspecific protein adsorption in liquid crystal immunoassays by using surfactants. ACS APPLIED MATERIALS & INTERFACES 2011; 3:3496-3500. [PMID: 21815616 DOI: 10.1021/am200716x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this paper, we report the role of surfactants in minimizing nonspecific protein adsorption in liquid crystal (LC)-based immunoassays in which LC is used as a readout system. Among all surfactants tested, only nonionic surfactant such as Tween 20 can effectively reduce the nonspecific protein adsorption, while maintaining the selectivity of the LC-based immunoassay. We also show that to minimize nonspecific protein adsorption, Tween 20 can be added directly into the antibody solution to a final concentration of 0.8 mM. After the addition of Tween 20, better correlations between the antibody concentrations and the interference colors of LCs can therefore be obtained. For example, when Cy3 antibiotin was used, black, yellow, red, and green interference colors correspond to a concentration of 5, 25, 50, and 100 μg/mL, respectively. This feature gives LC immunoassay a unique advantage over the fluorescence-based immunoassay.
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Affiliation(s)
- Wei Zhang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore (117576)
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13
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Comparison of four distinct detection platforms using multiple ligand binding assay formats. J Immunol Methods 2011; 371:106-13. [DOI: 10.1016/j.jim.2011.06.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 03/24/2011] [Accepted: 06/17/2011] [Indexed: 11/19/2022]
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14
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Hagan AK, Zuchner T. Lanthanide-based time-resolved luminescence immunoassays. Anal Bioanal Chem 2011; 400:2847-64. [PMID: 21556751 PMCID: PMC3102841 DOI: 10.1007/s00216-011-5047-7] [Citation(s) in RCA: 173] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2011] [Revised: 04/12/2011] [Accepted: 04/19/2011] [Indexed: 11/30/2022]
Abstract
The sensitive and specific detection of analytes such as proteins in biological samples is critical for a variety of applications, for example disease diagnosis. In immunoassays a signal in response to the concentration of analyte present is generated by use of antibodies labeled with radioisotopes, luminophores, or enzymes. All immunoassays suffer to some extent from the problem of the background signal observed in the absence of analyte, which limits the sensitivity and dynamic range that can be achieved. This is especially the case for homogeneous immunoassays and surface measurements on tissue sections and membranes, which typically have a high background because of sample autofluorescence. One way of minimizing background in immunoassays involves the use of lanthanide chelate labels. Luminescent lanthanide complexes have exceedingly long-lived luminescence in comparison with conventional fluorophores, enabling the short-lived background interferences to be removed via time-gated acquisition and delivering greater assay sensitivity and a broader dynamic range. This review highlights the potential of using lanthanide luminescence to design sensitive and specific immunoassays. Techniques for labeling biomolecules with lanthanide chelate tags are discussed, with aspects of chelate design. Microtitre plate-based heterogeneous and homogeneous assays are reviewed and compared in terms of sensitivity, dynamic range, and convenience. The great potential of surface-based time-resolved imaging techniques for biomolecules on gels, membranes, and tissue sections using lanthanide tracers in proteomics applications is also emphasized.
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Affiliation(s)
- A. K. Hagan
- Institute of Bioanalytical Chemistry, Center of Biotechnology and Biomedicine, Faculty of Chemistry and Mineralogy, Leipzig University, Deutscher Platz 5, 04103 Leipzig, Germany
| | - T. Zuchner
- Institute of Bioanalytical Chemistry, Center of Biotechnology and Biomedicine, Faculty of Chemistry and Mineralogy, Leipzig University, Deutscher Platz 5, 04103 Leipzig, Germany
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15
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van Eeden PE, Wiese MD, Aulfrey S, Hales BJ, Stone SF, Brown SGA. Using time-resolved fluorescence to measure serum venom-specific IgE and IgG. PLoS One 2011; 6:e16741. [PMID: 21304970 PMCID: PMC3031629 DOI: 10.1371/journal.pone.0016741] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Accepted: 01/12/2011] [Indexed: 02/03/2023] Open
Abstract
We adapted DELFIA™ (dissociation-enhanced lanthanide fluoroimmunoassay), a time resolved fluorescence method, to quantitate whole venom specific and allergenic peptide-specific IgE (sIgE), sIgG1 and sIgG4 in serum from people clinically allergic to Australian native ant venoms, of which the predominant cause of allergy is jack jumper ant venom (JJAV). Intra-assay CV was 6.3% and inter-assay CV was 13.7% for JJAV sIgE. DELFIA and Phadia CAP JJAV sIgE results correlated well and had similar sensitivity and specificity for the detection of JJAV sIgE against intradermal skin testing as the gold standard. DELFIA was easily adapted for detecting sIgE to a panel of other native ant venoms.
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Affiliation(s)
- Pauline E van Eeden
- Centre for Clinical Research in Emergency Medicine, Western Australian Institute for Medical Research, University of Western Australia, Perth, Australia.
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16
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Gehring AG, Tu SI. High-throughput biosensors for multiplexed food-borne pathogen detection. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2011; 4:151-172. [PMID: 21689045 DOI: 10.1146/annurev-anchem-061010-114010] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Incidental contamination of foods by pathogenic bacteria and/or their toxins is a serious threat to public health and the global economy. The presence of food-borne pathogens and toxins must be rapidly determined at various stages of food production, processing, and distribution. Producers, processors, regulators, retailers, and public health professionals need simple and cost-effective methods to detect different species or serotypes of bacteria and associated toxins in large numbers of food samples. This review addresses the desire to replace traditional microbiological plate culture with more timely and less cumbersome rapid, biosensor-based methods. Emphasis focuses on high-throughput, multiplexed techniques that allow for simultaneous testing of numerous samples, in rapid succession, for multiple food-borne analytes (primarily pathogenic bacteria and/or toxins).
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Affiliation(s)
- Andrew G Gehring
- Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, Pennsylvania 19038, USA
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17
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Mahanti P, Taylor T, Hayes MA, Cochran D, Petkus MM. Improved detectability and signal strength for rotating phase fluorescence immunoassays through image processing. Analyst 2010; 136:365-73. [PMID: 21046041 DOI: 10.1039/c0an00549e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorescence immunoassays based on rotating solid phase have shown promise of lowered detection limits, among other advantages. However, intrinsic background distortion effects have limited their utility. Here, novel image processing strategies are used to minimize these effects and improve the estimate of concentration and lower the detection limit. This initial demonstration of a new processing capability is performed on data for a protein, myoglobin, which is a biomarker for acute myocardial infarction. For these data, compared with published results, the detection limit is improved by a factor of approximately one hundred (to 700 fM), which is competitive with or better than other immunoassay strategies (ELISA, for example) that are fully developed. This work suggests that image and video processing technologies can provide a valuable alternative approach to biochemical detection and concentration estimation.
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18
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Dai X, Hilsen RE, Hu WG, Fulton RE. Microbead electrochemiluminescence immunoassay for detection and identification of Venezuelan equine encephalitis virus. J Virol Methods 2010; 169:274-81. [PMID: 20678522 DOI: 10.1016/j.jviromet.2010.07.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2010] [Revised: 07/19/2010] [Accepted: 07/22/2010] [Indexed: 02/03/2023]
Abstract
An electrochemiluminescence (ECL) immunoassay, incorporating chemically biotinylated and ruthenylated antibodies down-selected from a panel of monoclonal and polyclonal reagents, was developed to detect and identify Venezuelan equine encephalitis virus (VEEV). The limit of detection (LOD) of the optimized ECL assay was 10(3)pfu/ml VEEV TC-83 virus and 1 ng/ml recombinant (r) VEEV E2 protein. The LOD of the ECL assay was approximately one log unit lower than that of a sandwich enzyme-linked immunosorbent assay (ELISA) incorporating the same immunoreagents. Repetition of ECL assays over time and by different operators demonstrated that the assay was reproducible (coefficient of variation 4.7-18.5% month-to-month; 3.3-8.8% person-to-person). The VEEV ECL assay exhibited no cross-reactivity with two closely related alphaviruses or with 21 heterologous biological agents. A genetically biotinylated recombinant VEEV antibody, MA116SBP, was evaluated for utility for detection of rE2; although functional in the ECL assay, the LOD was two log units higher (100 ng/ml vs 1 ng/ml) using MA116SBP than when chemically biotinylated antibody was used. The ECL assay detected VEEV at the lowest LOD (highest sensitivity) hitherto reported in the published literature and ECL assay results were generated in ∼60 min compared to a 6-8h period required for ELISA. Results have demonstrated a sensitive, rapid, and fully automated ECL immunoassay for detection and identification of VEEV.
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Affiliation(s)
- Xiaojiang Dai
- Defence Research and Development Canada-Suffield, PO Box 4000, Station Main, Medicine Hat, AB, Canada
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Identification of a surrogate marker for infection in the African green monkey model of inhalation anthrax. Infect Immun 2008; 76:5790-801. [PMID: 18852240 DOI: 10.1128/iai.00520-08] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
In 2001, a bioterrorism attack involving Bacillus anthracis spore-laced letters resulted in 22 cases of inhalation anthrax, with five fatalities. This incident identified gaps in our health care system and precipitated a renewed interest in identifying both therapeutics and rapid diagnostic assays. To address those gaps, well-characterized animal models that resemble the human disease are needed. In addition, a rapid assay for a reliable diagnostic marker is key to the success of these efforts. In this study, we exposed African green monkeys to B. anthracis spores; examined clinical signs and physiological parameters, including fever, heart rate, complete blood count, and bacteremia; and evaluated the PCR assay and electrochemiluminescence (ECL) immunoassay for the biomarkers protective antigen and capsule. The results demonstrated that although there were neither objective clinical nor physiological signs that consistently identified either infection or the onset of clinical anthrax disease, the African green monkey is a suitable animal model exhibiting a disease course similar to that observed in the rhesus model and humans. We also demonstrated that detection of the biomarkers protective antigen and capsule correlated with bacterial loads in the blood of these nonhuman primates. The ECL immunoassay described here is simple and sensitive enough to provide results in one to two hours, making this assay a viable option for use in the diagnosis of anthrax, leading to timely initiation of treatment, which is a key component of B. anthracis therapeutic development.
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Haug M, Schepp CP, Kalbacher H, Dannecker GE, Holzer U. 70-kDa heat shock proteins: specific interactions with HLA-DR molecules and their peptide fragments. Eur J Immunol 2007; 37:1053-63. [PMID: 17357109 DOI: 10.1002/eji.200636811] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Heat shock protein 70 (HSP70):peptide complexes are involved in MHC class I and class II-restricted antigen presentation enabling enhanced activation of antigen-specific T cells. Here, we investigated the potential of bacterial and mammalian HSP70 molecules to interact with peptide fragments from HLA-DR and the corresponding complete HLA-DR molecules. Peptide fragments were found to interact with DnaK, the HSP70 homologue from E. coli, but less with stress-inducible human Hsp70. Only a peptide sequence exclusively found in rheumatoid arthritis-protective HLA-DR molecules did not interact with DnaK. Subsequently, we investigated the interaction of complete HLA-DR molecules with HSP70 and detected a specific HSP70:HLA-DR interaction, with highest affinity for human stress-inducible Hsp70. In contrast to the peptide fragments, no allele-specific differences in Hsp70 affinity were detected with complete HLA-DR molecules. Interaction with HLA-DR molecules was increased at lowered pH values, whereas HSP70-chaperoned peptides were released at acidic pH, thus HSP70 could serve as scanner and carrier for antigenic peptides of self or foreign origin and transfer chaperoned peptides onto MHC class II molecules in acidic late endosomal compartments. Our findings indicate that direct interaction between mammalian HSP70 and HLA-DR molecules could be involved in the HSP70-mediated enhancement of MHC class II-restricted peptide presentation and CD4(+) T cell activation.
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Affiliation(s)
- Markus Haug
- Children's Hospital, University of Tuebingen, Tuebingen, Germany
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Kulagina NV, Shaffer KM, Ligler FS, Taitt CR. Antimicrobial peptides as new recognition molecules for screening challenging species. SENSORS AND ACTUATORS. B, CHEMICAL 2007; 121:150-157. [PMID: 18231571 PMCID: PMC1826611 DOI: 10.1016/j.snb.2006.09.044] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The goal of this study was to evaluate binding of four targets of biodefense interest to immobilized antimicrobial peptides (AMPs) in biosensor assays. Polymyxins B and E, melittin, cecropins A, B, and P, parasin, bactenecin and magainin-1, as well as control antibodies, were used as capture molecules for detection of Cy3-labeled Venezuelan equine encephalitis virus (VEE), vaccinia virus, C. burnetti and B. melitensis. Although VEE, vaccinia virus and C. burnetti did not show any binding activity to their corresponding capture antibodies, B. melitensis bound to immobilized anti-Brucella monoclonal antibodies. The majority of the immobilized AMPs included in this study bound labeled VEE, vaccinia virus and C. burnetti in a concentration-dependent manner, and B. melitensis bound to polymyxin B, polymyxin E, and bactenecin. No binding was observed on immobilized magainin-1. In contrast to all bacterial targets tested to date, VEE and vaccinia virus demonstrated similar patterns of binding to all peptides. While the direct assay is generally replaced by a sandwich assay for analysis of real-world samples, direct binding experiments are commonly used to characterize specificity and sensitivity of binding molecules. In this case, they clearly demonstrate the capability of AMPs as recognition molecules for four biothreat agents.
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Affiliation(s)
- Nadezhda V Kulagina
- Center for Bio/Molecular Science & Engineering, Naval Research Laboratory, Washington DC, 20375-5348 USA
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Krogh-Meibom T, Holmskov U, Løvendahl P, Nielsen NI, Ingvartsen KL. A time-resolved immunofluorometric assay for quantification of the bovine collectin conglutinin. J Immunol Methods 2004; 286:87-96. [PMID: 15087224 DOI: 10.1016/j.jim.2003.12.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2003] [Revised: 11/21/2003] [Accepted: 12/01/2003] [Indexed: 11/16/2022]
Abstract
A high capacity time-resolved immunofluorometric assay (TRIFMA) for the bovine collectin conglutinin was developed. The TRIFMA was constructed as a non-competitive sandwich assay based on polyclonal antibodies as the capture reagent and a novel monoclonal antibody raised against conglutinin as the detection reagent and was set up to run on an automatic analyzer designed for the TRIFMA detection system. Polyclonal antibodies immobilized on microtiter plate wells were incubated overnight at 4 degrees C with diluted plasma samples, including quality controls (QC) and dilutions of a plasma with known conglutinin concentration. Conglutinin was sandwiched between the capture antibodies and the monoclonal antibody and the detection optimised with biotin-labelled secondary antibodies and streptavidin-Eu(3+). Plates were washed four times between each step and finally incubated with enhancement solution before measuring the fluorescence. The assay detection limit was 0.34 ng/ml and the working range 0.80 ng/ml-0.20 microg/ml. Intra-plate and inter-plate coefficients of variation (CV) were in the range of 5.0-8.3% and 6.2-7.2%, respectively, at concentrations of 3.4 and 150 ng/ml. Recovery was 90.9+/-2.4% and 98.8+/-2.5% when samples were spiked with 20 ng/ml and 100 ng/ml purified bovine conglutinin (BK). No circadian rhythm (24-h variation) in conglutinin plasma levels was observed across animals, indicating that the plasma levels were not influenced by, e.g. feeding. Samples could be stored at -20 degrees Celsius and were not sensitive to repeated freezing and thawing. In conclusion, the developed TRIFMA for bovine conglutinin is specific and reliable over a measurement range covering most situations.
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Affiliation(s)
- T Krogh-Meibom
- Department of Animal Health and Welfare, Danish Institute of Agricultural Sciences, Research Centre Foulum, P.O. Box 50, DK-8830 Tjele, Denmark
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Barrie SE, Eno-Amooquaye E, Hardcastle A, Platt G, Richards J, Bedford D, Workman P, Aherne W, Mittnacht S, Garrett MD. High-throughput screening for the identification of small-molecule inhibitors of retinoblastoma protein phosphorylation in cells. Anal Biochem 2003; 320:66-74. [PMID: 12895470 DOI: 10.1016/s0003-2697(03)00349-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The tumor suppressor protein, pRb, regulates progression through the G1 phase of the cell cycle by its ability to bind to and regulate the activity of a variety of transcription factors. This function of pRb is disabled through its phosphorylation by the cyclin-dependent kinase (CDK) family of serine/threonine kinases. In many human cancers, genetic alteration such as loss of CDK inhibitor function and deregulated G1 cyclin expression leads to inappropriate phosphorylation and hence inactivation of this tumor suppressor. Identification of cell-permeable small molecules that block pRb phosphorylation in these tumors could therefore lead to development of an effective anticancer treatment. As a result, we have developed a high-throughput assay to detect changes in the level of pRb phosphorylation in cells. Signal detection is by a time-resolved fluorescence-based cellular immunosorbant assay on a fixed monolayer of cells. This comprises a mouse monoclonal antibody that recognizes the phosphorylated form of serine 608 on pRb, a known site of CDK phosphorylation, and a Europium-labeled secondary antibody for signal detection. The assay is reproducible and amenable to automation and has been used to screen 2000 compounds in a search for cell-permeable small molecules that will block pRb phosphorylation.
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Affiliation(s)
- S Elaine Barrie
- Cancer Research U.K. Centre for Cancer Therapeutics at the Institute of Cancer Research, Brookes Lawley Building, 15 Cotswold Road, Sutton, Surrey, SM2 5NG, UK
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Thach DC, Shaffer KM, Ma W, Stenger DA. Assessing the feasibility of using neural precursor cells and peripheral blood mononuclear cells for detection of bioactive Sindbis virus. Biosens Bioelectron 2003; 18:1065-72. [PMID: 12782470 DOI: 10.1016/s0956-5663(02)00246-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Viruses form a significant class of bio-threat agents. Currently, the only method to determine the bioactivity of viruses in vitro is to measure viral and cellular responses after co-incubation of cells with virus. Our goal is to find biomarkers for classification of agents, establishment of bioactivity, and/or prediction of disease outcomes. To begin development of a cell-based biosensor for detection of bioactive Sindbis virus (SV), our model analyte, we surveyed the outcomes of SV interaction with primary rat neural precursor cells (NPC) and human peripheral blood mononuclear cells (PBMC). Confocal fluorescence analysis of NPC treated with recombinant SV carrying green-fluorescent-protein (SV-GFP) showed that most cells were GFP positive by day 1 post inoculation. 4',6-Diamidino-2-phenylindole dihydrochloride (DAPI) staining of the nucleus showed nuclear condensation and fragmentation, and the percentage of TUNEL positive cells were higher in virus-treated cells than in mock-treated control. Also, there were less BrdU positive cells in virus-treated cells compared to control. Thus, SV infects NPC, decreases cellular proliferation, and induces cell death via apoptosis. PBMC were treated with SV- or UV-inactivated SV. By day 5 post infection, there were fewer adherent cells in SV-treated PBMC compared to UV-inactivated SV treated PBMC. However, the percentage of viable cells remained the same, and virus growth curves showed only clearance of virus. Thus, SV induces detachment of a subpopulation of PBMC while not killing most of the cells. Together, these results indicate that NPC and PBMC respond to bioactive SV inoculation, suggesting potential use as detectors of SV in cell-based biosensor paradigm. These studies also provide the rationale, time-scale, and phenotypic correlates for further studies with gene expression arrays.
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Affiliation(s)
- Dzung C Thach
- Center for Bio/Molecular Science and Engineering, Code 6910, Naval Research Laboratory, Washington, DC 20375, USA
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Peruski AH, Peruski LF. Immunological methods for detection and identification of infectious disease and biological warfare agents. CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY 2003; 10:506-13. [PMID: 12853377 PMCID: PMC164256 DOI: 10.1128/cdli.10.4.506-513.2003] [Citation(s) in RCA: 154] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Anne Harwood Peruski
- Department of Microbiology and Immunology, Indiana University School of Medicine, Northwest Center, Gary, Indiana 46408, USA.
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