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Nakagawa M, Tomioka Y, Akuta T. Efficient expression and purification of tag-free recombinant human procalcitonin (hPCT) with precise sequence in E.coli. Protein Expr Purif 2024; 214:106374. [PMID: 37793478 DOI: 10.1016/j.pep.2023.106374] [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] [Received: 08/02/2023] [Revised: 09/15/2023] [Accepted: 09/23/2023] [Indexed: 10/06/2023]
Abstract
We present an efficient method for expression and purification of recombinant human procalcitonin (hPCT) in E. coli T7 express LysY/Iq cells, ensuring precise N- and C-terminal amino acid sequences. Our method involves fusing codon-optimized cDNA with two distinct tag sequences: eXact tag and chitin binding domain (CBD) tag. To purify the protein, we employ a two-step affinity chromatography process. Firstly, we utilize the N-terminal Profinity eXact tag and purify the protein through Profinity eXact-affinity column chromatography using a resin on which a mutant subtilisin protease was immobilized. The eXact tag was removed by adding NaF to activate the enzyme. Subsequently, the digested sample containing C-terminal CBD tag is directly loaded for the second step of chitin affinity chromatography. Elution is achieved through dithiothreitol (DTT)-catalyzed self-cleavage of the intein sequence from the fusion protein. As a result, the target protein is selectively recovered in the flow-through, completely tag-free, with a purity exceeding 95%. To ensure high purity and eliminate potential contaminants, we effectively remove E. coli host DNA and endotoxins through a combination of streptomycin sulfate, Triton X-114, and ammonium sulfate treatment. The exceptional level of purity obtained eliminates the need for further purification steps in most applications. This highly purified hPCT can be used as a calibrator in procalcitonin or calcitonin immunoassays. Notably, our approach effectively manages small peptides that are prone to degradation by E. coli host proteases, offering a robust solution for various research and application requirements.
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Affiliation(s)
- Masataka Nakagawa
- Research and Development Division, Kyokuto Pharmaceutical Industrial Co., Ltd., 3333-26, Aza-Asayama, Kamitezuna Takahagi-shi, Ibaraki, 318-0004, Japan
| | - Yui Tomioka
- Research and Development Division, Kyokuto Pharmaceutical Industrial Co., Ltd., 3333-26, Aza-Asayama, Kamitezuna Takahagi-shi, Ibaraki, 318-0004, Japan
| | - Teruo Akuta
- Research and Development Division, Kyokuto Pharmaceutical Industrial Co., Ltd., 3333-26, Aza-Asayama, Kamitezuna Takahagi-shi, Ibaraki, 318-0004, Japan.
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2
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Tsounidi D, Tsaousis V, Xenos N, Kroupis C, Moutsatsou P, Christianidis V, Goustouridis D, Raptis I, Kakabakos S, Petrou P. Simultaneous determination of procalcitonin and interleukin-6 in human serum samples with a point-of-care biosensing device. Talanta 2023; 258:124403. [PMID: 36889192 DOI: 10.1016/j.talanta.2023.124403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 02/17/2023] [Accepted: 02/27/2023] [Indexed: 03/06/2023]
Abstract
The simultaneous determination of two inflammatory diseases biomarkers, namely procalcitonin (PCT) and interleukin-6 (IL-6), in human serum samples employing a Point-of-Care device based on Multi Area Reflectance Spectroscopy is presented. Dual-analyte detection was achieved using silicon chips with two silicon dioxide areas of different thickness, one functionalized with an antibody specific for PCT and the other with an antibody specific for IL-6. The assay included reaction of immobilized capture antibodies with mixtures of PCT and IL-6 calibrators with the biotinylated detection antibodies, streptavidin and biotinylated-BSA. The reader provided for the automated execution of the assay procedure, as well as for the collection and processing of the reflected light spectrum, the shift of which is correlated to analytes concentration in the sample. The assay was completed in 35 min and the detection limits for PCT and IL-6 were 2.0 and 0.01 ng/mL respectively. The dual-analyte assay was characterized by high reproducibility (the intra- and inter-assay coefficients of variation were less than 10% for both analytes) and accuracy (the percent recovery values ranged from 80 to 113% for both analytes). Moreover, the values determined for the two analytes in human serum samples with the assay developed were in good agreement with the values determined for the same samples by clinical laboratory methods. These results support the potential of the proposed biosensing device application for inflammatory biomarkers determination at the Point-of-Need.
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Affiliation(s)
- Dimitra Tsounidi
- Immunoassays/Immunosensors Lab, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Centre for Scientific Research "Demokritos", 15341, Aghia, Paraskevi, Greece
| | | | - Nikolaos Xenos
- Clinical Biochemistry & Molecular Diagnostics Lab, Attikon University General Hospital, Medical School, National and Kapodistrian University of Athens, 12462, Chaidari, Greece
| | - Christos Kroupis
- Clinical Biochemistry & Molecular Diagnostics Lab, Attikon University General Hospital, Medical School, National and Kapodistrian University of Athens, 12462, Chaidari, Greece
| | - Paraskevi Moutsatsou
- Clinical Biochemistry & Molecular Diagnostics Lab, Attikon University General Hospital, Medical School, National and Kapodistrian University of Athens, 12462, Chaidari, Greece
| | | | - Dimitrios Goustouridis
- ThetaMetrisis, S.A., 12132, Athens, Greece; Department of Electrical & Electronics Eng., University of West Attica, 12244, Athens, Greece
| | - Ioannis Raptis
- ThetaMetrisis, S.A., 12132, Athens, Greece; Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research "Demokritos", 15341, Aghia, Paraskevi, Greece
| | - Sotirios Kakabakos
- Immunoassays/Immunosensors Lab, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Centre for Scientific Research "Demokritos", 15341, Aghia, Paraskevi, Greece
| | - Panagiota Petrou
- Immunoassays/Immunosensors Lab, Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, National Centre for Scientific Research "Demokritos", 15341, Aghia, Paraskevi, Greece.
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Xu X, Lei X, Ye L, Song S, Liu L, Xu L, Xu C, Kuang H. Gold-based paper sensor for sensitive detection of procalcitonin in clinical samples. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2022. [DOI: 10.1016/j.cjac.2022.100062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Danthanarayana AN, Brgoch J, Willson RC. Photoluminescent Molecules and Materials as Diagnostic Reporters in Lateral Flow Assays. ACS APPLIED BIO MATERIALS 2022; 5:82-96. [PMID: 35014811 PMCID: PMC9798899 DOI: 10.1021/acsabm.1c01051] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The lateral flow assay (LFA) is a point-of-care diagnostic test commonly available in an over-the-counter format because of its simplicity, speed, low cost, and portability. The reporter particles in these assays are among their most significant components because they perform the diagnostic readout and dictate the test's sensitivity. Today, gold nanoparticles are frequently used as reporters, but recent work focusing on photoluminescent-based reporter technologies has pushed LFAs to better performance. These efforts have focused specifically on reporters made of organic fluorophores, quantum dots, lanthanide chelates, persistent luminescent phosphors, and upconversion phosphors. In most cases, photoluminescent reporters show enhanced sensitivity compared to conventional gold nanoparticle-based assays. Here, we examine the advantages and disadvantages of these different reporters and highlight their potential benefits in LFAs. Our assessment shows that photoluminescent-based LFAs can not only reach lower detection limits than LFAs with traditional reporters, but they also can be capable of quantitative and multiplex analyte detection. As a result, the photoluminescent reporters make LFAs well-suited for medical diagnostics, the food and agricultural industry, and environmental testing.
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Affiliation(s)
| | - Jakoah Brgoch
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Richard C Willson
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
- Department of Biology and Biochemistry, University of Houston, Houston, Texas 77204, United States
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Liu X, Liu X, Lin S, Du K, Ai Y, Wang Y. Procalcitonin measurement using antibody-conjugated fluorescent microspheres distinguishes atypical bacterial meningitis from viral encephalitis in children. Anal Biochem 2021; 626:114219. [PMID: 33930346 DOI: 10.1016/j.ab.2021.114219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Revised: 04/01/2021] [Accepted: 04/21/2021] [Indexed: 11/16/2022]
Abstract
Examination of cerebrospinal fluid in atypical bacterial meningitis (ABM) is similar to that of viral encephalitis (VE), so ABM can easily be misdiagnosed as VE, which can delay diagnosis and treatment. We developed a simple, rapid hand-held lateral flow immunoassay detection system based on fluorescent microspheres (FMS) for procalcitonin (PCT) detection, which provides an indicator to differentiate between ABM and VE. With this novel method, the antigen-antibody reaction systems involve different species, making the test strips more stable than those utilizing one species. The strips exhibited a wide dynamic range (0.04-50 ng/mL) and good sensitivity (0.03 ng/mL). The function of PCT in the identification of ABM and VE in children was further studied. A significant difference in PCT levels was observed between the ABM and VE groups (P = 0.00) and between the ABM and the normal control groups (P = 0.00). PCT levels were not significantly different between the VE and normal control groups (P = 0.30). The area under the receiver operating characteristic curve of PCT for the diagnosis of ABM was 0.95. These findings collectively indicate the usefulness of the PCT detection method based on FMS for clinically differentiating between ABM and VE.
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Affiliation(s)
- Xinquan Liu
- School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China.
| | - Xingmiao Liu
- Department of Pediatric Neurology, Tianjin Children's Hospital, Tianjin, 300074, China
| | - Si Lin
- School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Kang Du
- School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Yu Ai
- Tianjin Boomscience Technology Co., Ltd., Tianjin, 300401, China
| | - Yan Wang
- School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin, 300072, China.
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Miao J, Du K, Li X, Xu X, Dong X, Fang J, Cao W, Wei Q. Ratiometric electrochemical immunosensor for the detection of procalcitonin based on the ratios of SiO2-Fc–COOH–Au and UiO-66-TB complexes. Biosens Bioelectron 2021; 171:112713. [DOI: 10.1016/j.bios.2020.112713] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 09/22/2020] [Accepted: 10/07/2020] [Indexed: 12/15/2022]
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Molinero-Fernández Á, Moreno-Guzmán M, López MÁ, Escarpa A. Magnetic Bead-Based Electrochemical Immunoassays On-Drop and On-Chip for Procalcitonin Determination: Disposable Tools for Clinical Sepsis Diagnosis. BIOSENSORS-BASEL 2020; 10:bios10060066. [PMID: 32560303 PMCID: PMC7344519 DOI: 10.3390/bios10060066] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/29/2020] [Accepted: 06/11/2020] [Indexed: 12/28/2022]
Abstract
Procalcitonin (PCT) is a known protein biomarker clinically used for the early stages of sepsis diagnosis and therapy guidance. For its reliable determination, sandwich format magnetic bead-based immunoassays with two different electrochemical detection approaches are described: (i) disposable screen-printed carbon electrodes (SPE-C, on-drop detection); (ii) electro-kinetically driven microfluidic chips with integrated Au electrodes (EMC-Au, on-chip detection). Both approaches exhibited enough sensitivity (limit of detection (LOD) of 0.1 and 0.04 ng mL−1 for SPE-C and EMC-Au, respectively; cutoff 0.5 ng mL−1), an adequate working range for the clinically relevant concentrations (0.5–1000 and 0.1–20 ng mL−1 for SPE-C and EMC-Au, respectively), and good precision (RSD < 9%), using low sample volumes (25 µL) with total assay times less than 20 min. The suitability of both approaches was successfully demonstrated by the analysis of human serum and plasma samples, for which good recoveries were obtained (89–120%). Furthermore, the EMC-Au approach enabled the easy automation of the process, constituting a reliable alternative diagnostic tool for on-site/bed-site clinical analysis.
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Affiliation(s)
- Águeda Molinero-Fernández
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcalá, Ctra. Madrid-Barcelona, Km. 33.600, Alcalá de Henares, 28871 Madrid, Spain;
| | - María Moreno-Guzmán
- Department of Chemistry in Pharmaceutical Sciences, Analytical Chemistry, Faculty of Pharmacy, Universidad Complutense de Madrid, Avenida Complutense, s/n, 28040 Madrid, Spain;
| | - Miguel Ángel López
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcalá, Ctra. Madrid-Barcelona, Km. 33.600, Alcalá de Henares, 28871 Madrid, Spain;
- Chemical Research Institute “Andres M. Del Rio”, Universidad de Alcalá, Alcalá de Henares, 28871 Madrid, Spain
- Correspondence: (M.Á.L.); (A.E.)
| | - Alberto Escarpa
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcalá, Ctra. Madrid-Barcelona, Km. 33.600, Alcalá de Henares, 28871 Madrid, Spain;
- Chemical Research Institute “Andres M. Del Rio”, Universidad de Alcalá, Alcalá de Henares, 28871 Madrid, Spain
- Correspondence: (M.Á.L.); (A.E.)
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Tang J, Jiang Y, Ge Z, Wu H, Chen H, Dai J, Gu Y, Mao X, Lu J. Quantum Dots-Based Point-of-Care Measurement of Procalcitonin in Finger-Prick Blood and Venous Whole Blood Specimens. Lab Med 2020; 51:34-40. [PMID: 31245815 DOI: 10.1093/labmed/lmz025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
OBJECTIVE To determine whether the performance of a new quantum dots-based point-of-care test (POCT) devices is qualified for procalcitonin testing. METHODS Finger-prick and venous blood specimens from 153 patients were measured with a quantum dots-based POCT device; the results were compared with those from the reference method. RESULTS The quantum dots-based POCT device correlated well with the reference method in measuring plasma, venous whole blood, and finger-prick blood. No significant bias was observed (-0.08 ng/mL). At 0.5 ng per mL cutoff value, the concordances were 96.6%, 94.6%, and 90.5% for plasma, venous whole blood, and finger-prick blood, respectively. And at 2 ng per mL cutoff value, the concordances were 98.0%, 96.6%, and 95.3%, respectively. CONCLUSIONS The quantum dots-based POCT device measured procalcitonin with multiple specimen types, high sensitivity, wide detection range, and short turnaround time. It would allow a more widespread use of procalcitonin and help lessen the burden of overcrowding in healthcare facilities in China.
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Affiliation(s)
- Junming Tang
- Department of Clinical Laboratory, Yixing People's Hospital, Affiliated Jiangsu University, China
| | - Yan Jiang
- Department of Critical Care Medicine, Yixing People's Hospital, Affiliated Jiangsu University, China
| | - Zhijun Ge
- Department of Critical Care Medicine, Yixing People's Hospital, Affiliated Jiangsu University, China
| | - Haifeng Wu
- Department of Critical Care Medicine, Yixing People's Hospital, Affiliated Jiangsu University, China
| | - Huajun Chen
- Department of Critical Care Medicine, Yixing People's Hospital, Affiliated Jiangsu University, China
| | - Ji Dai
- Department of Critical Care Medicine, Yixing People's Hospital, Affiliated Jiangsu University, China
| | - Yinjie Gu
- Department of Critical Care Medicine, Yixing People's Hospital, Affiliated Jiangsu University, China
| | - Xuhua Mao
- Department of Clinical Laboratory, Yixing People's Hospital, Affiliated Jiangsu University, China
| | - Junjie Lu
- Department of Critical Care Medicine, Yixing People's Hospital, Affiliated Jiangsu University, China
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9
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Molinero-Fernández Á, Moreno-Guzmán M, Arruza L, López MÁ, Escarpa A. Polymer-Based Micromotor Fluorescence Immunoassay for On-the-Move Sensitive Procalcitonin Determination in Very Low Birth Weight Infants' Plasma. ACS Sens 2020; 5:1336-1344. [PMID: 32204587 DOI: 10.1021/acssensors.9b02515] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A new fluorescence micromotor-based immunoassay (FMIm) has been developed for procalcitonin (PCT) determination as an early sepsis diagnostic analytical tool. The micromotors combine the high binding capacity of the specific antibodies onto their polymeric polypyrrole outer layer (PPy layer), with their magnetic guidance (Ni layer) and self-propulsion by catalytic generation of oxygen bubbles (PtNP inner layer) to actively recognize the PCT antigen. This FMIm allowed a sensitive (LOD = 0.07 ng mL-1) and direct PCT determination in clinical samples from very low-birth-weight infants (VLBWI) with sepsis suspicion, using small volumes of sample (25 μL) in a clinically relevant range of concentrations (0.5-150 ng mL-1). The good agreement between PCT levels obtained by our micromotor-based method and routine immunofluorescence hospital determination demonstrates the feasibility for the analysis in VLBWI samples and its potential as a point-of-care diagnostic tool for sepsis.
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Affiliation(s)
- Águeda Molinero-Fernández
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, Ctra. Madrid-Barcelona, Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain
| | - María Moreno-Guzmán
- Department of Chemistry in Pharmaceutical Sciences, Analytical Chemistry, Faculty of Pharmacy, Universidad Complutense de Madrid, Avenida Complutense, s/n, 28040 Madrid, Spain
| | - Luis Arruza
- Division of Neonatology, Instituto del Niño y del Adolescente, Hospital Clínico San Carlos-IdISSC, 28040 Madrid, Spain
| | - Miguel Ángel López
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, Ctra. Madrid-Barcelona, Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain
- Chemical Research Institute “Andres M. Del Rio”, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain
| | - Alberto Escarpa
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, Ctra. Madrid-Barcelona, Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain
- Chemical Research Institute “Andres M. Del Rio”, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain
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Shen M, Chen Y, Zhu Y, Zhao M, Xu Y. Enhancing the Sensitivity of Lateral Flow Immunoassay by Centrifugation-Assisted Flow Control. Anal Chem 2019; 91:4814-4820. [PMID: 30835106 DOI: 10.1021/acs.analchem.9b00421] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Lateral flow immunoassay (LFIA) is widely used but is limited by its sensitivity. In this study, a novel centrifugation-assisted lateral flow immunoassay (CLFIA) was proposed that had enhanced sensitivity compared to traditional LFIA based on test strips. For CLFIA, a vaulted piece of nitrocellulose membrane was prepared and inserted into a centrifugal disc. Powered by the centrifugal force, the sample volume on the disc was not limited and the flow rate of the reaction fluid was steady and adjustable at different rotation speeds. It was found that lower rotation speeds and larger sample volumes resulted in greater signal intensity in the nitrocellulose membrane as well as higher sensitivity, indicating that the actively controlled flow on the disc allowed for sensitivity enhancement of CLFIA. To operate CLFIA on the centrifugal disc, a portable and cost-effective operating device was constructed to rotate the disc with a stepper motor and collect the results with a smartphone. The proposed method was successfully applied to detect prostate specific antigen (PSA) in human serum. Standard curves were established for CLFIA and LFIA, and both had correlation coefficients of up to 0.99. Under optimal conditions (1500 rpm rotation speed, 120 μL sample volume), the detection limit of CLFIA reached 0.067 ng/mL, showing a 6.2-fold improvement in sensitivity compared to that of LFIA. With clinical serum samples, a good correlation was observed between PSA concentrations measured by CLFIA and by a bulky commercial instrument in hospital. In summary, this portable, cost-effective, and easy-to-use system holds great promise for biomarker detection with enhanced sensitivity compared to traditional LFIA.
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Affiliation(s)
- Minjie Shen
- Department of Biomedical Engineering , Tsinghua University School of Medicine , Beijing 100084 , China
| | - Yiqi Chen
- Department of Biomedical Engineering , Tsinghua University School of Medicine , Beijing 100084 , China
| | - Yunzeng Zhu
- Department of Biomedical Engineering , Tsinghua University School of Medicine , Beijing 100084 , China
| | - Mangsuo Zhao
- Tsinghua University Yuquan Hospital , Beijing 100049 , China
| | - Youchun Xu
- Department of Biomedical Engineering , Tsinghua University School of Medicine , Beijing 100084 , China.,National Engineering Research Center for Beijing Biochip Technology , Beijing 102206 , China
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Li P, Chen Z, Liu B, Li K, Wang H, Lin L, He L, Wei J, Liu T. Establishment of a novel homogeneous nanoparticle-based assay for sensitive procalcitonin detection of ultra low-volume serum samples. Int J Nanomedicine 2018; 13:5395-5404. [PMID: 30254442 PMCID: PMC6143642 DOI: 10.2147/ijn.s173776] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Purpose Sepsis is a potentially fatal systemic body infection with a significant mortality rate worldwide. Although C-reactive protein (CRP), interleukin-6 (IL-6), and procalcitonin (PCT) might be biomarkers for sepsis diagnosis, PCT is more sensitive and specific than CRP or IL-6. We aimed to establish an efficient immunoassay that precisely detects PCT in human serum for the early diagnosis of sepsis. Materials and methods We developed a novel amplified luminescent proximity homogeneous assay (AlphaLISA) for the quantitative detection of PCT in serum. In this assay, a pair of antibodies was used to capture PCT in serum and to form sandwich complexes after incubating for 15 minutes at 37°C. Results PCT concentrations were determined within a linear range of 0.016–100 ng/mL. The limit of detection was 18.6 pg/mL. The results demonstrate that the reproducibility, recovery, and specificity of this assay for PCT meet the requirements of clinical detection. The coefficient of determination (R2) between this method and commercially available enzyme-linked fluorescent assay (ELFA) kits was estimated to be 0.93045 in clinical serum testing. Conclusion The novel assay for PCT detection was robust with high sensitivity and a broad dynamic range. Compared with conventional heterogeneous detection methods such as ELISA, this assay measured the concentration of the homogeneous form of PCT and provided results that are more accurate within a shorter detection time. We expect that this novel method will be useful for the early screening and prognosis evaluation of patients with sepsis.
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Affiliation(s)
- Peng Li
- State Key Laboratory of Organ Failure Research, Institute of Antibody Engineering, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, People's Republic of China,
| | - Zhenhua Chen
- State Key Laboratory of Organ Failure Research, Institute of Antibody Engineering, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, People's Republic of China,
| | - Bing Liu
- State Key Laboratory of Organ Failure Research, Institute of Antibody Engineering, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, People's Republic of China,
| | - Kun Li
- State Key Laboratory of Organ Failure Research, Institute of Antibody Engineering, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, People's Republic of China,
| | - Hao Wang
- State Key Laboratory of Organ Failure Research, Institute of Antibody Engineering, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, People's Republic of China,
| | - Li Lin
- State Key Laboratory of Organ Failure Research, Institute of Antibody Engineering, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, People's Republic of China,
| | - Ling He
- State Key Laboratory of Organ Failure Research, Institute of Antibody Engineering, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, People's Republic of China,
| | - Jie Wei
- Department of Clinical Laboratory, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, Guangdong, People's Republic of China
| | - Tiancai Liu
- State Key Laboratory of Organ Failure Research, Institute of Antibody Engineering, School of Laboratory Medicine and Biotechnology, Southern Medical University, Guangzhou, Guangdong, People's Republic of China,
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12
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Wu J, Chen Y, Yang M, Wang Y, Zhang C, Yang M, Sun J, Xie M, Jiang X. Streptavidin-biotin-peroxidase nanocomplex-amplified microfluidics immunoassays for simultaneous detection of inflammatory biomarkers. Anal Chim Acta 2017; 982:138-147. [PMID: 28734353 DOI: 10.1016/j.aca.2017.05.031] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2017] [Revised: 05/17/2017] [Accepted: 05/18/2017] [Indexed: 01/03/2023]
Abstract
Simultaneous, sensitive and quantitative detection of biomarkers in infectious disease is crucial for guiding antimicrobial treatment and predicting prognosis. This work reported an ultrasensitive and quantitative microfluidic immunoassay combined with the streptavidin-biotin-peroxidase (SA-B-HRP) nanocomplex-signal amplification system (MIS) to detect two inflammatory biomarkers, procalcitonin (PCT, for discriminating bacterial infections from nonbacterial infections) and interleukin-6 (IL-6, for monitoring the kinetics of infectious disease) simultaneously. The amplification system was based on the one step self-assembly of SA and B-HRP to form the SA-B-HRP nanocomplex, which effectively amplified the chemiluminescent signals. The linear ranges for PCT and IL-6 detections by MIS were 250-1.28 × 105 pg mL-1 and 5-1280 pg mL-1, and the limit of detection (LOD) were 48.9 pg mL-1 and 1.0 pg mL-1, respectively, both of which were significantly improved compared with microfluidic immunoassays without amplification system (MI). More importantly, PCT and IL-6 in human serum could be simultaneously detected in the same run by MIS, which could greatly improve the detection efficiency and reduce the cost. Given the advantages of high sensitivity, multiplex and quantitative detection, MIS could be potentially applied for detection of biomarkers at low concentration in clinical diagnosis.
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Affiliation(s)
- Jing Wu
- Analytical & Testing Center of Beijing Normal University, Beijing 100875, China; CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
| | - Yiping Chen
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
| | - Mingzhu Yang
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
| | - Yu Wang
- Beijing Institute for Tropical Medicine, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Cheng Zhang
- Beijing Institute for Tropical Medicine, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Mo Yang
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
| | - Jiashu Sun
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.
| | - Mengxia Xie
- Analytical & Testing Center of Beijing Normal University, Beijing 100875, China.
| | - Xingyu Jiang
- CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100046, China.
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Wu C, Hu L, Xia J, Xu G, Luo K, Liu D, Duan H, Cheng S, Xiong Y, Lai W. Comparison of immunochromatographic assays based on fluorescent microsphere and quantum-dot submicrobead for quantitative detection of aflatoxin M1 in milk. J Dairy Sci 2017; 100:2501-2511. [DOI: 10.3168/jds.2016-12065] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 12/12/2016] [Indexed: 12/14/2022]
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