Abstract
An electrochemical immunoassay is described for the detection of the protein biomarker mucin 1 (MUC-1) and of breast cancer cells of type MCF-7 where MUC-1 is overexpressed. The method is based on the use of silver nanoclusters (Ag-NCs) acting as a signalling probe. The Ag-NCs were synthesized via chemical reduction in the presence of a DNA strand with the sequence of 5′-GCAGTTGATCCTTTGGATACCCTGG-C12-3′. The strand contains mucin 1 aptamer (GCAGTTGATCCTTTGGATACCCTGG) that can specifically bind to MUC1 and the template (C12) for synthesis of Ag-NCs. The assay involves the following steps: (1) Construction of an immunosensor by immobilizing the antibody against MUC-1 on a glassy carbon electrode; (2) addition of sample containing MUC-1; (3) addition of Ag-NCs; (4) signal amplification via silver enhancement process (deposition of metal silver on Ag-NCs); (5) measurement via square wave voltammetry. The current measured at a potential of 0.11 V (vs. SCE) is logarithmically related to the concentration of MUC-1 in the 1 to 500 nM range, with a detection limit of 0.5 nM. We also demonstrate that MCF-7 cancer cells can be detected by this method with high sensitivity (50 cells per mL) due to the presence of MUC-1 proteins on the cell surface.
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Qu Z, Xu H, Xu P, Chen K, Mu R, Fu J, Gu H (2014) Ultrasensitive ELISA using enzyme-loaded nanospherical brushes as labels. Anal Chem 86(19):9367–9371
Ding Y, Li D, Li B, Zhao K, Du W, Zheng J, Yang M (2013) A water-dispersible, ferrocene-tagged peptide nanowire for amplified electrochemical immunosensing. Biosens Bioelectron 48:281–286
Zhou M, Sun Z, Shen C, Li Z, Zhang Y, Yang M (2013) Application of hydrogel prepared from ferrocene functionalized amino acid in the design of novel electrochemical immunosensing platform. Biosens Bioelectron 49:243–248
Zhou M, Yang M, Zhou F (2014) Paper based colorimetric biosensing platform utilizing cross-linked siloxane as probe. Biosens Bioelectron 55:39–43
Sun Z, Deng L, Gan H, Shen R, Yang M, Zhang Y (2013) Sensitive immunosensor for tumor necrosis factor alpha based on dual signal amplification of ferrocene modified self-assembled peptide nanowire and glucose oxidase functionalized gold nanorod. Biosens Bioelectron 39(1):215–219
Yan L, Shi H, He X, Wang K, Tang J, Chen M, Ye X, Xu F, Lei Y (2014) A versatile activatable fluorescence probing platform for cancer cells in vitro and in vivo based on self-assembled aptamer/carbon nanotube ensembles. Anal Chem 86(18):9271–9277
Fang YS, Huang XJ, Wang LS, Wang JF (2014) An enhanced sensitive electrochemical immunosensor based on efficient encapsulation of enzyme in silica matrix for the detection of human immunodeficiency virus p24. Biosens Bioelectron 64C:324–332
Liu G, Zhang Y, Guo W (2014) Covalent functionalization of gold nanoparticles as electronic bridges and signal amplifiers towards an electrochemical immunosensor for botulinum neurotoxin type A. Biosens Bioelectron 61:547–553
Akter R, Kyun Rhee C, Rahman MA (2014) Sensitivity enhancement of an electrochemical immunosensor through the electrocatalysis of magnetic bead-supported non-enzymatic labels. Biosens Bioelectron 54:351–357
Yang F, Han J, Zhuo Y, Yang Z, Chai Y, Yuan R (2014) Highly sensitive impedimetric immunosensor based on single-walled carbon nanohorns as labels and bienzyme biocatalyzed precipitation as enhancer for cancer biomarker detection. Biosens Bioelectron 55:360–365
Diez I, Ras RH (2011) Fluorescent silver nanoclusters. Nanoscale 3(5):1963–1970
Yuan X, Luo Z, Yu Y, Yao Q, Xie J (2013) Luminescent noble metal nanoclusters as an emerging optical probe for sensor development. Chem Asian J 8(5):858–871
Shang L, Dong S, Nienhaus GU (2011) Ultra-small fluorescent metal nanoclusters: synthesis and biological applications. Nano Today 6:401–408
Choi S, Dickson RM, Yu J (2012) Developing luminescent silver nanodots for biological applications. Chem Soc Rev 41(5):1867–1891
Obliosca JM, Liu C, Yeh HC (2013) Fluorescent silver nanoclusters as DNA probes. Nanoscale 5(18):8443–8461
Petty JT, Zheng J, Hud NV, Dickson RM (2004) DNA-templated Ag nanocluster formation. J Am Chem Soc 126:5207–5212
Yeh HC, Sharma J, Shih Ie M, Vu DM, Martinez JS, Werner JH (2012) A fluorescence light-up Ag nanocluster probe that discriminates single-nucleotide variants by emission color. J Am Chem Soc 134(28):11550–11558
Zhou Z, Du Y, Dong S (2011) DNA-Ag nanoclusters as fluorescence probe for turn-on aptamer sensor of small molecules. Biosens Bioelectron 28(1):33–37
Yeh HC, Sharma J, Han JJ, Martinez JS, Werner JH (2010) A DNA--silver nanocluster probe that fluoresces upon hybridization. Nano Lett 10(8):3106–3110
Zhang Y, Cai Y, Qi Z, Lu L, Qian Y (2013) DNA-templated silver nanoclusters for fluorescence turn-on assay of acetylcholinesterase activity. Anal Chem 85(17):8455–8461
Huang Z, Pu F, Lin Y, Ren J, Qu X (2011) Modulating DNA-templated silver nanoclusters for fluorescence turn-on detection of thiol compounds. Chem Commun (Camb) 47(12):3487–3489
Han S, Zhu S, Liu Z, Hu L, Parveen S, Xu G (2012) Oligonucleotide-stabilized fluorescent silver nanoclusters for turn-on detection of melamine. Biosens Bioelectron 36(1):267–270
Shen C, Xia X, Hu S, Yang M, Wang J (2015) Silver nanoclusters-based fluorescence assay of protein kinase activity and inhibition. Anal Chem 87(1):693–698
Dong H, Jin S, Ju H, Hao K, Xu LP, Lu H, Zhang X (2012) Trace and label-free microRNA detection using oligonucleotide encapsulated silver nanoclusters as probes. Anal Chem 84(20):8670–8674
Kufe DW (2009) Mucins in cancer: function, prognosis and therapy. Nat Rev Cancer 9(12):874–885
Wan Y, Wang Y, Wu J, Zhang D (2011) Graphene oxide sheet-mediated silver enhancement for application to electrochemical biosensors. Anal Chem 83(3):648–653
Lin D, Wu J, Ju H, Yan F (2014) Nanogold/mesoporous carbon foam-mediated silver enhancement for graphene-enhance delectrochemical immunosensing of carcinoem bryonic antigen. Biosens Bioelectron 52:153–158
Zhang Z, Li W, Zhao Q, Cheng M, Xu L, Fang X (2014) Highly sensitive visual detection of copper (II) using water-soluble azide-functionalized gold nanoparticles and silver enhancement. Biosens Bioelectron 59:40–44
Wei W, Li DF, Pan XH, Liu SQ (2012) Electrochemiluminescent detection of mucin 1 protein and MCF-7 cancer cells based on the resonance energy transfer. Analyst 137(9):2101–2106
Ritchie CM, Johnsen KR, Kiser JR, Antoku Y, Dickson RM, Petty JT (2007) J Phys Chem C 111:175–181
Gupta S, Huda S, Kilpatrick PK, Velev OD (2007) Characterization and optimization of gold nanoparticle-based silver-enhanced immunoassays. Anal Chem 79:3810–3820
Ding L, Qian R, Xue Y, Cheng W, Ju H (2010) In situ scanometric assay of cell surface carbohydrate by glyconanoparticle-aggregation-regulated silver enhancement. Anal Chem 82:5804–5809
Wen J, Zhou S, Yuan Y (2014) Graphene oxide as nanogold carrier for ultrasensitive electrochemical immunoassay of Shewanella oneidensis with silver enhancement strategy. Biosens Bioelectron 52:44–49
Gao F, Zhu Z, Lei J, Geng Y, Ju H (2013) Sub-femtomolar electrochemical detection of DNA using surface circular strand-replacement polymerization and gold nanoparticle catalyzed silver deposition for signal amplification. Biosens Bioelectron 39(1):199–203
Zhang J, Chen X, Yang M (2014) Enzyme modified peptide nanowire as label for the fabrication of electrochemical immunosensor. Sensors Actuators B Chem 196:189–193
He Y, Lin Y, Tang H, Pang D (2012) A graphene oxide-based fluorescent aptasensor for the turn-on detection of epithelial tumor marker mucin 1. Nanoscale 4:2054–2059
Ma N, Jiang W, Li T, Zhang Z, Qi H, Yang M (2014) Fluorescence aggregation assay for the protein biomarker mucin 1 using carbon dot-labeled antibodies and aptamers. Microchim Acta 182(1–2):443–447
Hu R, Wen W, Wang Q, Xiong H, Zhang X, Gu H, Wang S (2014) Novel electrochemical aptamer biosensor based on an enzyme–gold nanoparticle dual label for the ultrasensitive detection of epithelial tumour marker MUC1. Biosens Bioelectron 53:384–389
Hua X, Zhou Z, Yuan L, Liu S (2013) Selective collection and detection of MCF-7 breast cancer cells using aptamer-functionalized magnetic beads and quantum dots based nano-bio-probes. Anal Chim Acta 788:135–140
Croce MV, Isla-Larrain MT, Capafons A, Price MR, Segal-Eiras S-E (2001) Humoral immune response induced by the protein core of MUC1 mucin in pregnant and healthy women. Breast Cancer Res Treat 69:1–11
Acknowledgments
The authors thank the support of this work by the National Key Basic Research Program of China (2014CB744502), the National Natural Science Foundation of China (No. 81200326, 21205039 and 21105128) and Natural Science Foundation of Hunan Province (Grant No. 2015JJ1019 and 13JJ6071)
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Qingjun Guo and Xiangzhi Li contributed equally to this work.
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Guo, Q., Li, X., Shen, C. et al. Electrochemical immunoassay for the protein biomarker mucin 1 and for MCF-7 cancer cells based on signal enhancement by silver nanoclusters. Microchim Acta 182, 1483–1489 (2015). https://doi.org/10.1007/s00604-015-1471-2
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DOI: https://doi.org/10.1007/s00604-015-1471-2