1
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Yang X, Zheng L, Sun Y, Tan X, Zhang B, Li X, Li H. Quantitative Detection of House Dust Mites-Specific IgE by Light-Initiated Chemiluminescence Assay. Lab Med 2024; 55:27-33. [PMID: 37052524 DOI: 10.1093/labmed/lmad024] [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] [Indexed: 04/14/2023] Open
Abstract
OBJECTIVE To establish a new method for quantitative detection of house dust mite (HDM)-sIgE based on light-initiated chemiluminescence assay (LiCA). METHODS The assay was established after optimizing the reaction conditions, and the assay performance was evaluated according to the clinical guidelines. Further, the results of LiCA were compared with those from the ELISA and ImmunoCAP methods. RESULTS Coefficients of variation for repeatability ranged from 4.22% to 7.69%, and intermediate precision from 8.38% to 10.34%. The limit of blank (LoB), limit of detection (LoD), and limit of quantitation (LoQ) were 0.066 kUA/L, 0.165 kUA/L, and 0.171 kUA/L, respectively. The coefficient of correlation (r) between the results of LiCA and ELISA was 0.9263, and the r between the results of LiCA and ImmunoCAP was 0.8870. CONCLUSIONS A HDM-sIgE quantitation assay based on LiCA was established, which could be used as a new reliable analytical tool for the determination of HDM-sIgE.
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Affiliation(s)
- Xiaohui Yang
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Lisheng Zheng
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Yuanmin Sun
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Xin Tan
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Bei Zhang
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Xue Li
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Huiqiang Li
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin, China
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2
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Sun Y, Su M, Wang M, Zhang R, Wang S, Tan J, Jia Q, Li H, Meng Z. Establishment and analytical performance of light-initiated chemiluminescence assay method for detecting thyrotropin receptor antibody. Biomark Med 2023; 17:349-357. [PMID: 37338244 DOI: 10.2217/bmm-2022-0666] [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: 06/21/2023] Open
Abstract
Aim: To evaluate double-antibody competitive light-initiated chemiluminescence assay method for detecting the thyrotropin receptor antibody. Materials & methods: The optimal working concentrations of competitive antibody and rTSHR were confirmed by checkerboard titration. Assay performance was assessed by precision, linearity, accuracy, limit of blank and clinical evaluation. Results: The coefficient of variation for repeatability and intermediate precision was 3.9-5.9 and 0.9-1.3%, respectively. The correlation coefficient was 0.999 by least squares linear fitting in linearity evaluation. The relative deviation ranged from -5.9 to 4.1%, and the limit of blank of the method was 0.13 IU/l. Compared with the Roche cobas system (Roche Diagnostics, Mannheim, Germany), the relationship between the two assays was shown to be significantly correlative. Conclusion: The light-initiated chemiluminescence assay method for detecting thyrotropin receptor antibody is a rapid, novel and accurate method for thyrotropin receptor antibody measurement.
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Affiliation(s)
- Ying Sun
- Department of Clinical Laboratory, Tianjin Medical University General Hospital, Tianjin, 300052, People's Republic of China
| | - Mengxue Su
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, 300052, People's Republic of China
| | - Miao Wang
- Department of Nuclear Medicine, Tianjin Medical University Second Hospital, Pingjiang Road, No. 23, Hexi District, Tianjin, 300211, People's Republic of China
| | - Ruyi Zhang
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, 300052, People's Republic of China
| | - Shen Wang
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, 300052, People's Republic of China
| | - Jian Tan
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, 300052, People's Republic of China
| | - Qiang Jia
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, 300052, People's Republic of China
| | - Huiqiang Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin, 300203, People's Republic of China
| | - Zhaowei Meng
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin, 300052, People's Republic of China
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3
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Development of amplified luminescent proximity homogeneous assay for quantitation of gastrin-17. Anal Biochem 2023; 662:115016. [PMID: 36502889 DOI: 10.1016/j.ab.2022.115016] [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: 11/08/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022]
Abstract
A highly sensitive and convenient amplified luminescent proximity homogeneous assay (AlphaLISA) method with high throughput and automation potential was developed for quantitation of serum Gastrin-17 (G-17) levels, which can facilitate the early diagnosis of atrophic gastritis in people at high risk of gastric cancer using a non-invasive approach. In this study, donor and acceptor beads with modified carboxyl groups on the surface were directly coupled to anti-G-17 antibodies through activation was proposed for application in the development of the new AlphaLISA, which can effectively simplify the steps and shorten the reaction time to achieve faster detection. Therefore, the G-17-AlphaLISA only needs to react for 15 min to obtain good analysis results. The proposed method has a wider detection range than commercial enzyme-linked immunosorbent assay (ELISA) kits (0.12-112.8 pmol/L > 0.5-40 pmol/L). In addition, results of G-17-AlphaLISA and ELISA had good correlation and agreement (ρ = 0.936). Importantly, the developed method may be more suitable for the large-scale screening of people at high risk for gastric cancer than traditional ELISA and provides a novel solution for other biomarkers that require accurate, highly sensitive, and high throughput detection.
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4
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Zhang B, Lv S, Qiang Z, Guo M, Tan X, Li H, Yu Y. Improved Sensitivity and Wide Range Detection of Small Analytes Using a Two-Antigen-Combined Competitive Immunoassay. ACS OMEGA 2022; 7:48121-48129. [PMID: 36591119 PMCID: PMC9798763 DOI: 10.1021/acsomega.2c06126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Competitive immunoassays have unique advantages in the detection of small molecules and are widely used in clinical practice. However, the concentrations of some analytes usually vary greatly among different populations, which makes it difficult to balance the sensitivity and detection range of competitive immunoassays. Studies have shown that using haptens with weaker affinity for specific antibodies as competitive antigens can help improve the sensitivity of the method. Here, we developed a competitive light initiated chemiluminescence assay based on the combination of antigens with different affinities, which has high sensitivity and wide detection range. As a proof of concept, estradiol was used as the analyte. After the mixing ratio was optimized, the two labeled haptens played different competitive roles due to the different concentrations of estradiol to be tested, which improved the sensitivity of estradiol detection, while ensuring a certain detection range. The limit of detection of this method was 5.30 pg/mL, which is lower than most current estradiol immunoassay kits. Good linearity (R 2 = 0.9902) was obtained between estradiol concentrations of 17.07-2376.22 pg/mL. This study provides a new solution for the detection of small molecule biomarkers with a large concentration span, which also has considerable potential in other immunological detection methods.
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Affiliation(s)
- Bei Zhang
- Department
of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin300203, China
| | - Shuxing Lv
- Department
of Medical Laboratory, Tianjin Academy of
Traditional Chinese Medicine Affiliated Hospital, Tianjin300120, China
| | | | - Miao Guo
- Department
of Medical Laboratory, Tianjin Hexi Obstetrics
and Gynecology Hospital, Tianjin300203, China
| | - Xin Tan
- Department
of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin300203, China
| | - Huiqiang Li
- Department
of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin300203, China
| | - Yang Yu
- Department
of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin300203, China
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5
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Xiang Z, Chen X, Zhou X, Qin Y, Zhao X, Wang Y, Li Q, Huang B. Development and application of a novel aldehyde nanoparticle-based amplified luminescent proximity homogeneous assay for rapid quantitation of pancreatic stone protein. Clin Chim Acta 2022; 535:120-130. [PMID: 36030885 DOI: 10.1016/j.cca.2022.08.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 08/04/2022] [Accepted: 08/20/2022] [Indexed: 11/25/2022]
Abstract
BACKGROUND Timely diagnosis of bacterial infections is important to prevent sepsis. Classical infection biomarkers have some flaws, and common detection methods are time-consuming. Thus, we aimed to establish an efficient detection method that precisely detects pancreatic stone protein (PSP) in human plasma for the timely diagnosis of bacterial infections. METHODS Based on the novel amplified luminescent proximity homogeneous assay (AlphaLISA) method, donor and acceptor beads modified with aldehyde groups were directly coupled to the anti-PSP antibodies. PSP was quickly detected by a double-antibody sandwich method. Plasma samples from healthy individuals, bacterially infected patients, and acute-phase response patients were tested. RESULTS The detection time of the developed method is only 5 min. The results of PSP-AlphaLISA and time-resolved fluorescence were consistent (ρ = 0.9722). The plasma PSP levels of patients with bacterial infection were significantly higher than those of acute-phase response patients and healthy individuals (P < 0.05). PSP levels in patients with bacterial infection with sepsis were significantly higher than those in patients with bacterial infection without sepsis (P < 0.05). CONCLUSIONS The PSP-AlphaLISA exhibited excellent performance and may be applied to the differential diagnosis between bacterial infection and sepsis in patients without interference from patients with acute-phase response.
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Affiliation(s)
- Zhongyi Xiang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Xindong Chen
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Xiumei Zhou
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yuan Qin
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Xueqin Zhao
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Yigang Wang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China
| | - Qian Li
- Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, China.
| | - Biao Huang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou, China.
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Wang Y, Zheng Y, Li Y, Zhang S, Wang X, Zong H, Huang W, Kong D, Jiang Y, Liu P, Lv Q, Jiang H. Development of a rapid homogeneous immunoassay for detection of rotavirus in stool samples. Front Public Health 2022; 10:975720. [PMID: 35991049 PMCID: PMC9386352 DOI: 10.3389/fpubh.2022.975720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 07/19/2022] [Indexed: 11/16/2022] Open
Abstract
Rotavirus is the main pathogen causing acute viral gastroenteritis. Accurate and rapid diagnosis of rotavirus infection is important to determine appropriate treatment, prevention of unnecessary antibiotics use and control of infection spread. In this study, we established a rapid, accurate, and sensitive amplified luminescent proximity homogeneous assay linked immunosorbent assay (AlphaLISA) for detecting rotavirus and evaluated its efficacy in human stool samples. Our results demonstrated that the sensitivity of AlphaLISA (5−8) significantly exceeded that of the immunochromatographic assay (ICA, 5−4) for rotavirus antigen detection. The intra-assay and inter-assay coefficients of variation were 2.99–3.85% and 5.27–6.51%, respectively. Furthermore, AlphaLISA was specific for rotavirus and did not cross-react with other common diarrhea viruses. AlphaLISA and real-time reverse transcription polymerase chain reaction (RT-qPCR, which is considered a gold standard for detecting diarrhea viruses) tests showed consistent results on 235 stool samples, with an overall consistency rate of 97.87% and a kappa value of 0.894 (P < 0.001). The overall consistency rate of ICA compared with RT-qPCR was 95.74%. AlphaLISA showed better consistency with RT-qPCR than the routinely used ICA for rotavirus detection in stool samples. The AlphaLISA method can be used in clinical practice for the rapid, accurate, and sensitive detection of rotavirus infection.
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Affiliation(s)
- Ye Wang
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
| | - Yuling Zheng
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
| | - Yan Li
- The Fifth Medical Center of PLA General Hospital, Beijing, China
| | - Shengwei Zhang
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
- Department of Clinical Laboratory, Dongfang Hospital, Beijing University of Chinese Medicine, Beijing, China
| | - Xin Wang
- The Fifth Medical Center of PLA General Hospital, Beijing, China
| | - Huijun Zong
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
- The Fifth Medical Center of PLA General Hospital, Beijing, China
| | - Wenhua Huang
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
| | - Decong Kong
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
| | - Yongqiang Jiang
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
| | - Peng Liu
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
- *Correspondence: Peng Liu
| | - Qingyu Lv
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
- Qingyu Lv
| | - Hua Jiang
- State Key Laboratory of Pathogen and Biosecurity, Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences (AMMS), Beijing, China
- Hua Jiang
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7
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Zhang B, Kong D, Zheng L, Liu D, Tan X, Li H, Yu Y, Xing X. Development of a light-initiated chemiluminescence assay for the quantitative detection of cow's milk allergen-specific IgE. J Immunol Methods 2021; 501:113209. [PMID: 34933016 DOI: 10.1016/j.jim.2021.113209] [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: 08/05/2021] [Revised: 10/31/2021] [Accepted: 12/15/2021] [Indexed: 10/19/2022]
Abstract
BACKGROUND Cow's milk allergy is a common food allergy in children. Clinically, cow's milk-specific IgE (CM-sIgE) antibody test is often used to diagnose milk allergy. An inexpensive light-initiated chemiluminescence assay (LICA), with fast detection speed and small sample volume demand, has application prospects in the field of quantitative detection of CM-sIgE. METHODS Chemibeads coated with five major milk allergens, serum samples, biotinylated anti-human IgE antibodies, and streptavidin-coated sensibeads constitute a system to establish a LICA method for the quantitative detection of CM-sIgE. A series of experiments were performed to optimize its reaction conditions and evaluated its performance. RESULTS The optimal conditions for LICA were 10:4 mass ratio of chemibeads to milk allergen, 20 μg/mL chemibeads, 1.0 μg/mL biotinylated anti-human IgE antibodies and a 1/10 dilution of serum for 30-min incubation. The limit of Quantitation (LoQ) was 0.22 kUA/L. For repeatability, the CV ranged from 3.71% to 8.11%. For intermediate precision, the CV ranged from 4.08% to 14.71%. It was linear within 0.20-18.20 kUA/L. This method did not interfere with common interfering substances and total IgE in serum, and there was no obvious cross-reaction with milk-specific IgG and non-milk-specific IgE. CONCLUSION We have established a method to quantitatively detect CM-sIgE based on light-initiated chemiluminescence assay, which has good analytical performance and could meet the needs of clinical laboratories.
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Affiliation(s)
- Bei Zhang
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China
| | - Deyu Kong
- Department of Medical Laboratory, Tianjin Port Hospital, Tianjin 300450, China
| | - Lisheng Zheng
- Department of Medical Laboratory, Tianjin Children's Hospital, Tianjin 300134, China
| | - Dandan Liu
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China
| | - Xin Tan
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China
| | - Huiqiang Li
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China.
| | - Yang Yu
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China.
| | - Xiaoguang Xing
- Department of Medical Laboratory, Tianjin Port Hospital, Tianjin 300450, China.
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8
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Wang M, Li J, Huang Y, Chen T, Dong S, Zhang R, Wang S, Tan J, Jia Q, Meng Z. Analytical validation of the LiCA® high-sensitivity human thyroid stimulating hormone assay. Clin Biochem 2021; 101:42-49. [PMID: 34863703 DOI: 10.1016/j.clinbiochem.2021.11.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 11/26/2021] [Accepted: 11/28/2021] [Indexed: 11/24/2022]
Abstract
BACKGROUND We aimed to assess the analytical characteristics of a new high-sensitivity human thyroid stimulating hormone (hTSH) assay on a light-initiated chemiluminescent immunoassay system (LiCA Smart) and examine the utility of this assay in the context of profoundly low TSH levels (<0.01 mIU/L). METHODS Analytical validations included precision, linearity, reportable range, analytical sensitivity, interference, reagent lot-to-lot and between-instrument variability, and method comparisons. Additionally, a cross-sectional study was performed to evaluate the assay for the detection of profoundly low TSH levels in comparison to those of two other ultrasensitive hTSH assays. RESULTS Within-run and within-lab imprecisions (%CV) were < 5% at all concentrations studied. A satisfactory linearity (R = 0.998, change in recovery < 5%) was verified over the entire measuring range. Method comparisons demonstrated a reasonable agreement (R > 0.99, median bias < 5%) between LiCA and Cobas, ADVIA, UniCel or Architect. The limit of quantitation was 0.0019 mIU/L. Comparative measurements of 236 patient samples with profoundly low TSH levels (<0.01 mIU/L) by LiCA, Cobas, and Architect revealed that the detection rate observed with LiCA (67.8%) was significantly higher than that with Cobas (28.0%) or Architect (21.7%). In a further comparative follow-up of patients with overt hyperthyroidism who were receiving treatment, an earlier recovery response of TSH was observed in LiCA. CONCLUSIONS The LiCA Smart hTSH is a precise and highly sensitive fourth-generation assay. The assay demonstrated superior detection sensitivity for profoundly low TSH levels and was acceptable for clinical use.
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Affiliation(s)
- Miao Wang
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Jing Li
- Clinical Laboratory, Peking University International Hospital, Beijing, China
| | - Youyuan Huang
- Department of Endocrinology, Peking University First Hospital, Beijing, China
| | - Tao Chen
- Clinical Laboratory, Peking University International Hospital, Beijing, China
| | - Sheng Dong
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Ruyi Zhang
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Shen Wang
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Jian Tan
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Qiang Jia
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Zhaowei Meng
- Department of Nuclear Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China.
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Zhang B, Liu D, Zheng L, Tan X, Yu Y, Zhang J, Li X, Li H. A light-initiated chemiluminescent assay for the detection of children's milk protein-specific IgE with excellent ability to avoid interference of specific IgG. J Immunol Methods 2021; 497:113110. [PMID: 34332973 DOI: 10.1016/j.jim.2021.113110] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 07/22/2021] [Accepted: 07/26/2021] [Indexed: 12/25/2022]
Abstract
The detection of allergen-specific IgE is of value for the diagnosis of children's milk allergy. However, its accuracy will interfere with the presence of high levels of specific IgG in the serum of children with milk allergy. To solve this problem, we established a light-initiated chemiluminescent assay (LICA) based on nanomicrospheres, which neutralized the interference of specific IgG by increasing the amount of antigen coated on the microspheres. The ability of this method to resist IgG interference was confirmed by adding extra specific IgG to the serum of allergic patients. Finally, the positive rate of allergen-specific IgE was increased to 85%, which was better than the indirect ELISA (70%), indicating that this method has certain advantages for the detection of specific IgE in children with milk allergy.
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Affiliation(s)
- Bei Zhang
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Dandan Liu
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Lisheng Zheng
- Department of Medical Laboratory, Tianjin Children's Hospital, Tianjin, China
| | - Xin Tan
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Yang Yu
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Jiayi Zhang
- Department of Medical Laboratory, Tianjin Children's Hospital, Tianjin, China
| | - Xue Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China.
| | - Huiqiang Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
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Yu Y, She T, Huang L, Xu J, Yan J, Jiang Q, Yang Z, Li H. Establishment of a homogeneous immunoassay-light-initiated chemiluminescence assay for detecting anti-Müllerian hormone in human serum. J Immunol Methods 2021; 494:113059. [PMID: 33895196 DOI: 10.1016/j.jim.2021.113059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 04/19/2021] [Accepted: 04/19/2021] [Indexed: 11/29/2022]
Abstract
Anti-Müllerian hormone (AMH) is known as a reliable marker of ovarian reserve (OR). The determination of AMH is of great importance and most existed AMH detection methods are heterogeneous immunoassay. In this study, a novel homogeneous sandwich immunoassay-light-initiated chemiluminescence assay (LICA) for detecting AMH serum level was developed. This AMH-LICA was performed by incubating serum samples with AMH mouse monoclonal antibody coated with chemibeads, streptavidin-coated sensibeads, and biotinylated AMH mouse monoclonal antibody. Sensitivity, precision, accuracy and cross-reactivity of this assay were evaluated. Besides, a regression analysis showed a high correlation between AMH-LICA and Roche Elecsys® AMH assay (y = 0.9851x + 0.07147, R2 = 0.9569). As a homogeneous immunoassay, this AMH-LICA could accurately and rapidly determine the serum level of AMH with high-throughput. Thus, this new developed assay may be a new useful analytical tool for the determination of AMH.
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Affiliation(s)
- Yang Yu
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China
| | - Tiantian She
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China
| | - Liang Huang
- Medical Equipment Department, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, China
| | - Jingxin Xu
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China
| | - Juanjuan Yan
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China
| | - Qi Jiang
- Department of Basic Medicine, Tianjin Medical College, Tianjin 300222, China
| | - Zhiyong Yang
- Center for Reproductive Medicine, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, China; Tongji University School of Medicine, Shanghai 200092, China.
| | - Huiqiang Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, China.
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11
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Liu Z, Yu Y, Liu H, Chen X, Li L, Huang L, Li H. Establishment of a sandwich light-initiated chemiluminescence assay with double antigen for detecting human cytomegalovirus IgG antibody. J Med Virol 2021; 93:5025-5032. [PMID: 33634873 DOI: 10.1002/jmv.26905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 02/09/2021] [Accepted: 02/24/2021] [Indexed: 01/18/2023]
Abstract
Determination of human cytomegalovirus IgG (HCMV IgG) level is of great importance in the diagnosis of HCMV infections. In this study, a novel, double antigen sandwich homogeneous immunoassay-based light-initiated chemiluminescent assay (LICA) for measuring HCMV IgG serum levels was developed. This sandwich LICA for HCMV IgG was performed by incubating serum samples with HCMV pp150 protein coated with chemibeads, streptavidin-coated sensibeads, and biotinylated HCMV pp150 protein. The working conditions of this assay were optimized and the correlation between the results of the LICA and enzyme-linked immunosorbent assay was evaluated. As a homogeneous immunoassay, this sandwich LICA could accurately and rapidly determine the serum levels of HCMV IgG with a high-throughput. Thus, this newly developed assay could be a useful analytical tool in the clinical diagnosis of HCMV infections.
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Affiliation(s)
- Zhiyong Liu
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China.,Department of Laboratory Medicine, Tianjin Hexi Hospital, Tianjin, China
| | - Yang Yu
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Hao Liu
- Department of Laboratory Medicine, Tianjin Central Hospital of Gynecology Obstetrics, Tianjin, China
| | - Xinying Chen
- Department of Laboratory Medicine, Tianjin Hexi Hospital, Tianjin, China
| | - Liuxu Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Lunhui Huang
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Huiqiang Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
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12
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Chen X, Yang R, Liang Y, Yuan T, Zhou J, Wang T, Cui L. Comparison and evaluation of Abbott chemiluminescent microparticle immunoassay and ChIVD light-initiated chemiluminescent assay in the detection of Treponema pallidum antibody. J Clin Lab Anal 2020; 34:e23275. [PMID: 32133697 PMCID: PMC7370704 DOI: 10.1002/jcla.23275] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Revised: 02/10/2020] [Accepted: 02/12/2020] [Indexed: 01/11/2023] Open
Abstract
Background Laboratory tests play an important role in the diagnosis of syphilis. This study aimed to compare and assess the performance of the Abbott chemiluminescent microparticle immunoassay (CMIA) and the ChIVD light‐initiated chemiluminescent assay (LICA) in the detection of Treponema pallidum (TP) antibody. Methods A total of 10 498 serum samples were detected with two assays, and the Treponema pallidum particle agglutination assay (TPPA) and recombinant immunoblot assay (RIBA) methods were used for confirmation. The sensitivity, specificity, positive predictive value, and negative predictive value of the Abbott CMIA and ChIVD LICA were calculated. The coincidence rate between two assays was also evaluated. The causes of false positive and false negative of two assays were studied. Results For the Abbott CMIA and ChIVD LICA, the sensitivity was 94.44% and 98.15%, the specificity was 99.89% and 99.81%, the positive predictive value was 93.29% and 88.83%, and the negative predictive value was 99.91% and 99.97%, respectively. The coincidence rate between Abbott CMIA and ChIVD LICA was 99.26%, and κ value was .790. The disease of infertility, hypertensive disease, liver disease, and cancer were the common causes of false positive in both assays, while infertility was also the main reason lead to false negative. Conclusion Our results demonstrated that the Abbott CMIA and ChIVD LICA generally had high sensitivity and specificity and therefore may be suitable for the detection of TP antibody and screening for syphilis.
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Affiliation(s)
- Xiaohui Chen
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Ruifeng Yang
- Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Peking University Hepatology Institute, Peking University People's Hospital, Beijing, China
| | - Yongming Liang
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Teng Yuan
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Jiansuo Zhou
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Tiancheng Wang
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Liyan Cui
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
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Li J, Li Z, Kong D, Li S, Yu Y, Li H. IgE and IgG4 responses to shrimp allergen tropomyosin and its epitopes in patients from coastal areas of northern China. Mol Med Rep 2020; 22:371-379. [PMID: 32319635 PMCID: PMC7248481 DOI: 10.3892/mmr.2020.11084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Accepted: 03/17/2020] [Indexed: 11/05/2022] Open
Abstract
Sensitization to allergens and their peptides varies among patients due to geographical or ethnic differences. The present study aimed to investigate immunoglobulin (Ig)E and IgG4 responses to tropomyosin and its peptides in shrimp allergic patients from northern China. A total of 92 subjects were studied, including 35 shrimp allergic patients, 29 patients with house dust mite (HDM) and/or cockroach allergic patients and 28 healthy volunteers. Serum IgE and IgG4 antibodies to recombinant shrimp tropomyosin (rPen a 1) and its peptides were measured by means of a light-initiated chemiluminescent assay. A total of 9 major sequential epitopes of Pen a 1 reported in the literature were synthesized. Of 35 shrimp allergic patients, 25 (71.4%) had positive Pen 1-specific IgE (sIgE) antibodies and 22 (62.9%) contained measurable rPen a 1-specific IgG4 (sIgG4) antibodies. A strong IgG4 response accompanied the presence of IgE to Pen a 1. None of the patients with HDM and/or cockroach allergy demonstrated IgE reactivity to rPen a 1. The reaction frequency of IgE binding epitope was 20–48%, while that of IgG4 binding epitope was 63.6–3.9%. The IgE and IgG4 recognition patterns of the tropomyosin peptides demonstrated high interpatient heterogeneity. Diversity of IgE binding epitopes was positively correlated with Pen a 1 sIgE levels. In the study population, tropomyosin was a major allergen recognized by the majority of shrimp allergic patients, which is consistent with previous reports. However, none of the 9 epitopes are major (reaction frequency >50%) IgE-binding regions, indicating the epitopes profile may be different in other regions.
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Affiliation(s)
- Junpu Li
- The Clinical Laboratory of Tianjin Chest Hospital, Tianjin 300222, P.R. China
| | - Zhiwei Li
- Department of Clinical Laboratory, School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Deyu Kong
- Department of Laboratory Medicine, Tianjin Port Hospital, Tianjin 300456, P.R. China
| | - Shaoshen Li
- Department of Laboratory Medicine, Academy of Traditional Chinese Medicine Affiliated Hospital, Tianjin 300120, P.R. China
| | - Yang Yu
- Department of Clinical Laboratory, School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
| | - Huiqiang Li
- Department of Clinical Laboratory, School of Medical Laboratory, Tianjin Medical University, Tianjin 300203, P.R. China
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Zhang J, Shen Y, Li J, Li H, Si P. Component-Resolved Diagnostic Study of Egg Allergy in Northern Chinese Children. BIOMED RESEARCH INTERNATIONAL 2020; 2020:3831087. [PMID: 32258118 PMCID: PMC7086423 DOI: 10.1155/2020/3831087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Accepted: 02/24/2020] [Indexed: 11/17/2022]
Abstract
BACKGROUND Egg component-specific IgE can be useful to evaluate and diagnose egg allergy, but their prevalence and clinical significance remain unclear in the local population. Previous studies have led to contradictory results regarding the value of specific IgG and specific IgG4 in sensitization. OBJECTIVE We aimed to determine the level of specific IgE, IgG, and IgG4 antibodies to the major egg allergens in egg-allergic children. METHODS Children from 6 months to 10 years of age were recruited. Egg allergy was confirmed by either a strong clinical history or an increased egg white-sIgE level. Other allergies were diagnosed by reactivity to other allergens but without egg-related symptoms and history. The serum sIgE, sIgG, and sIgG4 levels to major egg allergenic components (Gal d 1, Gal d 2, Gal d 3, Gal d 4, and Gal d 5), sIgE level to egg white, and tIgE level were determined by light-initiated chemiluminescent assay (LICA), ELISA, or ImmunoCAP. RESULTS Egg-allergic children had significantly higher levels of sIgE, sIgG, and sIgG4 to egg components than nonallergic children. Gal d 2 was the predominant allergen, and Gal d 2 sIgE level correlated with the egg white-sIgE level. Ratios of sIgE/sIgG4 to egg components were highest before 1 year of age and dropped gradually in the first decade of life. CONCLUSION Patterns of sIgE to egg components could distinguish different forms of egg allergy. Ratios of sIgE/sIgG4 could be useful in predicting tolerance in egg-sensitive subjects, but this needs further evaluation and investigation using more accurate models.
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Affiliation(s)
- Jiayi Zhang
- Department of Medical Laboratory, Tianjin Children's Hospital, Tianjin, China
| | - Yongming Shen
- Department of Medical Laboratory, Tianjin Children's Hospital, Tianjin, China
| | - Junpu Li
- Department of Clinical Laboratory, Tianjin Chest Hospital, Tianjin, China
| | - Huiqiang Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Ping Si
- Department of Medical Laboratory, Tianjin Children's Hospital, Tianjin, China
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Li J, Li L, Bian Y, Yu Y, Qiang Z, Zhang Y, Li H. Quantitation of estradiol by competitive light-initiated chemiluminescent assay using estriol as competitive antigen. J Clin Lab Anal 2019; 34:e23014. [PMID: 31444844 PMCID: PMC6977107 DOI: 10.1002/jcla.23014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 07/28/2019] [Accepted: 07/30/2019] [Indexed: 12/12/2022] Open
Abstract
Background Light‐initiated chemiluminescent assays (LICA) are homogeneous assays that are sensitive, specific, and free of separation and washing steps and have high throughput and high precision. Methods In this research, we developed a competitive method by LICA to achieve accurate quantification of estradiol (E2) in human serum. E2 competed with estriol (E3) for binding to anti‐human E2 antibodies. E3 was linked to biotin via bovine serum albumin as a linker. As this assay used competition between the labeled tracer and the analyte, an increase in E2 concentration will cause a signal decrease. Results The expected detection range of E2 was 20‐5000 pg/mL. The analytical and functional sensitivities were 7.16 and 13.7 pg/mL, respectively. The intra‐ and inter‐assay coefficients of variation were both below 15%, and the recovery rate ranged from 97.5% to 106.8%. The interference rates ranged from −3.6% to 5.4% and met detection requirements for E2 in hyperbilirubinemia, hemolysis, and lipemia in clinical samples. In addition, the cross‐reactivity rates between E2 and structural analogs and some reproductive hormones varied from 1.9% to 10.6% which showed that LICA is highly specific for E2. Moreover, our results showed high accordance with the IMMULITE 2000 (y = 0.6695x + 47.92, r2 = .843) and VIDAS systems (y = 1.099x − 821.5, r2 = .9392). Conclusion Our data show that the LICA, which is easy to automate, is a promising technique for quantification of E2 in human serum and could be used for clinical detection.
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Affiliation(s)
- Jiuzhi Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China.,Department of Clinical Laboratory, Tianjin Central Hospital of Obstetrics and Gynecology, Tianjin, China
| | - Liuxu Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Ying Bian
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Yang Yu
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Zhonghua Qiang
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
| | - Yuexiang Zhang
- Department of Clinical Laboratory, Tianjin Central Hospital of Obstetrics and Gynecology, Tianjin, China
| | - Huiqiang Li
- School of Medical Laboratory, Tianjin Medical University, Tianjin, China
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Yang S, Yang R, Zhang S, Liu D, Zhou J, Wang T, Cui L. Clinical diagnostic performance of light-initiated chemiluminescent assay compared with the Architect chemiluminescence immunoassay for detection of HCV antibody. J Clin Lab Anal 2019; 33:e22928. [PMID: 31148296 PMCID: PMC6757125 DOI: 10.1002/jcla.22928] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 04/17/2019] [Accepted: 05/13/2019] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Hepatitis C virus antibody (anti-HCV) test had been approved as a preliminary screening test for HCV infection. Light-initiated chemiluminescent assay (LiCA) was a homogenous method. We aimed to assess the clinical diagnostic performance of LiCA and compare it with that of chemiluminescence immunoassay (CLIA) which was widely used in clinical laboratories. METHODS A total of 10 772 patients from the Peking University Third Hospital were enrolled. The serum samples were detected on the ChIVD LiCA500 and Abbott Architect i2000SR platforms. Recombinant immunoblot assay (RIBA) and HCV RNA assay were used for confirmation. RESULTS The negative agreement rate between ChIVD LiCA anti-HCV assay and Abbott Architect anti-HCV assay was 99.91%, the positive agreement rate was 37.31%, the total agreement rate was 98.74%, and the kappa coefficient (κ) was 0.519. The sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of ChIVD LiCA anti-HCV assay were 96.39%, 99.95%, 89.58%, and 99.97%, respectively, which were superior to those of Abbott Architect anti-HCV assay (93.98%, 99.25%, 51.90%, and 99.95%, respectively). CONCLUSION ChIVD LiCA anti-HCV assay was a highly sensitive, specific homogenous method with good diagnostic performance, and was applicable for the routine screening of HCV infection in clinical laboratories.
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Affiliation(s)
- Shuo Yang
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Ruifeng Yang
- Beijing Key Laboratory of Hepatitis C and Immunotherapy for Liver Diseases, Peking University Hepatology Institute, Peking University People's Hospital, Beijing, China
| | - Siyu Zhang
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Di Liu
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Jiansuo Zhou
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Tiancheng Wang
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Liyan Cui
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
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Li J, Li S, Huang L, Cui Y, She T, Bian Y, Li H. A light-initiated chemiluminescent assay for rapid quantitation of allergen-specific IgG 4 in clinical samples. Clin Chim Acta 2018; 489:83-88. [PMID: 30517849 DOI: 10.1016/j.cca.2018.11.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 11/06/2018] [Accepted: 11/30/2018] [Indexed: 01/22/2023]
Abstract
BACKGROUND An increase in allergen-specific IgG4 (sIgG4), which serves as a blocking antibody, is associated with acquisition of immune tolerance after immunotherapy. In this study, we developed a rapid, sensitive, and homogeneous immunoassay based on the light-initiated chemiluminescent assay (LICA) technology for quantifying allergen sIgG4 in serum samples. METHODS Allergen sIgG4 was measured in vitro by incubating the sample with biotinylated allergens and chemiluminescent beads coated with anti-human IgG4 antibody, followed by the addition of streptavidin-coated sensitizer beads. Multiple tests were performed to optimize the working conditions of the LICA and evaluate its performance. RESULTS We established the optimal concentration of biotinylated allergens (250 ng/mL), the optimal dilution range (1:8 for Gal d 1, Gal d 2 sIgG4 and 1:4 for Gal d 3, Gal d 4 sIgG4), and the optimal incubation time (20 min for Gal d 1, Gal d 2 sIgG4 and 40 min for Gal d 3, Gal d 4 sIgG4). The lower limit of quantification (LLOQ) was 0.261 ng/mL. The coefficient variation (CV) of the LICA was <10%. The assay was unaffected by general interfering substances at physiological concentrations. It exhibited excellent accuracy to detect allergen-sIgG4 in human serum. Additionally, we demonstrated that the levels of Gal d 1, Gal d 2, and Gal d 3-sIgG4 were significantly higher in the egg allergy group (p < .05), but no differences were found between the groups for Gal d 4-sIgG4. CONCLUSIONS The LICA demonstrated satisfactory performance and can be used for quantifying allergen sIgG4 in clinical practice.
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Affiliation(s)
- Junpu Li
- School of Medical Laboratory, Tianjin Medical University, 1 Guangdong Road, Hexi District, Tianjin 300203, China
| | - Shaoshen Li
- Academy of Traditional Chinese Medicine Affiliated Hospital, 354 Beima Road, Hongqiao District,Tianjin, China
| | - Lunhui Huang
- School of Medical Laboratory, Tianjin Medical University, 1 Guangdong Road, Hexi District, Tianjin 300203, China
| | - Yaqiong Cui
- School of Medical Laboratory, Tianjin Medical University, 1 Guangdong Road, Hexi District, Tianjin 300203, China
| | - Tiantian She
- School of Medical Laboratory, Tianjin Medical University, 1 Guangdong Road, Hexi District, Tianjin 300203, China
| | - Ying Bian
- School of Medical Laboratory, Tianjin Medical University, 1 Guangdong Road, Hexi District, Tianjin 300203, China
| | - Huiqiang Li
- School of Medical Laboratory, Tianjin Medical University, 1 Guangdong Road, Hexi District, Tianjin 300203, China.
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Cui Y, She T, Zhao H, Li J, Li L, Gao W, Li H. Competitive light-initiated chemiluminescent assay: using 5-α-dihydrotestosterone-BSA as competitive antigen for quantitation of total testosterone in human sera. Anal Bioanal Chem 2018; 411:745-754. [PMID: 30478516 DOI: 10.1007/s00216-018-1496-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/28/2018] [Accepted: 11/13/2018] [Indexed: 11/29/2022]
Abstract
This paper described a homogeneous method, light-initiated chemiluminescent assay (LICA), for quantitation of total testosterone in human sera. The assay was bead based and built on a competitive-binding reaction format, in which 5-α-dihydrotestosterone (5-α-DHT) competed with the testosterone in serum samples in binding with biotinylated anti-testosterone antibody. The more testosterone in the serum sample, the less 5-α-DHT that bonded with biotinylated anti-testosterone antibodies. 5-α-DHT was coupled with emission beads (doped with thioxene derivatives and Eu(III) as a chemiluminescence emitter) via bovine serum albumin as a linker. Once streptavidin-coated sensitizer beads (modified with phthalocyanine as a photosensitizer) were added, the streptavidin/biotin reaction between 5-α-DHT-bound anti-testosterone antibody and sensitizer beads could bring emission and sensitizer beads together, which allowed energy transfer from sensitizer bead to emission bead. As such, an exciting light (680 nm) impinging on the sensitizer beads led to light emission at 520-620 nm by emission beads. The strength of the emitted light was inversely proportional to the testosterone in serum sample. The detection range of this assay was from 13.3 to 1200 ng/dL. The coefficient variation for intra- and inter-assay was lower than 15%. The recovery of this method ranged from 95.5 to 105.9% for different samples. Moreover, the LICA assay was highly specific with low cross-reactivity and interference. The concentration of testosterone from 58 serum samples analyzed by the LICA method significantly correlated (y = 0.97x + 1.87, R2 = 0.970, p < 0.001) with those obtained with the SIEMENS Centaur Xp System. Graphical abstract ᅟ.
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Affiliation(s)
- Yaqiong Cui
- Department of Pharmacology, School of Basic Medicine, Tianjin Medical University, No. 22 Qixiangtai Road, Heping District, Tianjin, 300203, China
| | - Tiantian She
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, No. 1 Guangdong Road, Hexi District, Tianjin, 300203, China
| | - Hong Zhao
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, No. 1 Guangdong Road, Hexi District, Tianjin, 300203, China
| | - Jiuzhi Li
- Department of Clinical Laboratory, Tianjin Central Hospital of Gynecology Obstetrics, 156 Sanlu Road, Nankai District, Tianjin, 300052, China
| | - Liuxu Li
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, No. 1 Guangdong Road, Hexi District, Tianjin, 300203, China
| | - Weizhen Gao
- Department of Pharmacology, School of Basic Medicine, Tianjin Medical University, No. 22 Qixiangtai Road, Heping District, Tianjin, 300203, China
| | - Huiqiang Li
- Department of Clinical Immunology, School of Medical Laboratory, Tianjin Medical University, No. 1 Guangdong Road, Hexi District, Tianjin, 300203, China.
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