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The development of sensitive and efficient cell sensing strategies to detect circulating tumor cells (CTCs) in peripheral blood is crucial for the early diagnosis and prognostic assessment of cancer clinical treatment. Herein, an array of hierarchical flower-like gold microstructures (HFGMs) with anisotropic nanotips was synthesized by a simple electrodeposition method and used as a capture substrate to construct an ECL cytosensor based on the specific recognition of target cells by aptamers. The complex topography of the HFGMs array not only catalyzed the enhancement of ECL signals, but also induced the cells to generate more filopodia, improving the capture efficiency and shortening the capture time. The effect of topographic roughness on cell growth and adhesion propensity was also investigated, while the cell capture efficiency was proposed to be an important indicator affecting the accuracy of the ECL cytosensor. In addition, the capture of cells on the electrode surface increased the steric hindrance, which caused ECL signal changes in the Ru(bpy) and TPrA system, realizing the quantitative detection of MCF-7 cells. The detection range of the sensor was from 10 to 10 cells mL and the detection limit was 18 cells mL. The proposed detection method avoids the process of separation, labeling and counting, which has great potential for sensitive detection in clinical applications.
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http://dx.doi.org/10.1016/j.aca.2024.342505 | DOI Listing |
Anal Chim Acta
January 2025
Laboratory Medicine Center, Department of Clinical Laboratory, Zhejiang Provincial People's Hospital (Affiliated People's Hospital), Hangzhou Medical College, Hangzhou, Zhejiang, China. Electronic address:
Background: Breast cancer CTCs have recently been recognized as an emerging biomarker for liquid biopsy of breast cancer. In this work, based on two-dimensional (2D) noble metal PtCo@rGO nanozymes and Au@CNTs bioconjugates, a novel electrochemiluminescence (ECL) cytosensor was developed in order to detect breast cancer CTCs (MCF-7) ultrasensitively.
Results: The PtCo@rGO nanozymes possessed large specific surface area and high efficiency peroxidase-like activity, which can be used as nanocarriers to anchor and catalyze luminol ECL emission efficiently.
Mikrochim Acta
November 2024
College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
The inability of surgical biopsy to monitor the dynamic evolution of cancer cells hampers its capacity to reflect real-time tumor heterogeneity. Circulating tumor cells (CTCs), as a crucial target in liquid biopsy, offer a novel approach for accurate monitoring of tumors. However, the rarity and complex phenotype resulting from epithelial-mesenchymal transition pose challenges for conventional methods such as CellSearch and immunohistochemistry, which have insufficient ability for simultaneous phenotyping and enumeration of CTCs.
View Article and Find Full Text PDFInt J Biol Macromol
June 2024
Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education, School of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, PR China.
Glucose transporter 4 (GLUT4) directly facilitates cellular uptake of glucose and plays a crucial role in mammalian adipose tissue glucose metabolism. In this work, we constructed a cytosensor for sensitive electrochemiluminescence (ECL) detection of GLUT4 in rat adipocytes (RA cells). A carbon nanotube sponge (CNTSP) was selected to fabricate a permeable electrode to overcome the steric hindrance of cells on the electrode.
View Article and Find Full Text PDFAnal Chim Acta
May 2024
State Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China. Electronic address:
The development of sensitive and efficient cell sensing strategies to detect circulating tumor cells (CTCs) in peripheral blood is crucial for the early diagnosis and prognostic assessment of cancer clinical treatment. Herein, an array of hierarchical flower-like gold microstructures (HFGMs) with anisotropic nanotips was synthesized by a simple electrodeposition method and used as a capture substrate to construct an ECL cytosensor based on the specific recognition of target cells by aptamers. The complex topography of the HFGMs array not only catalyzed the enhancement of ECL signals, but also induced the cells to generate more filopodia, improving the capture efficiency and shortening the capture time.
View Article and Find Full Text PDFMikrochim Acta
December 2023
Faculty of Science, Yibin University, Yibin, 644000, China.
Biotinylated ruthenium complexes exhibit improved photoluminescent (PL) properties when they bind with streptavidin, making them useful labels or probes in bio-related analysis. However, their ECL properties are still unknown to date. Herein, we reported the use of [Ru(bpy)(biot-bpy)] complexes as a new ECL luminophore, which was functionalized with biotin moiety and exhibited higher ECL efficiency after binding to streptavidin.
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