Label-free and high-sensitive detection of human breast cancer cells by aptamer-based leaky surface acoustic wave biosensor array.
A label-free and high-sensitive sensing technology for tumor cell recognition and detection was developed based on a novel 2 × 3 model of leaky surface acoustic wave (LSAW) aptasensor array. In this methodology, every resonator crystal unit of the LSAW aptasensor array had an individual oscillator circuit to work without mutual interference, and could oscillate independently with the phase shift stability of ± 0.15° in air phase and ± 0.3° in liquid phase. The aptamer was firstly assembled to the gold electrode surface of 100 MHz LiTaO3 piezoelectric crystal, which could effectively captured target cells (MCF-7 cells) based on the specific interaction between aptamer and the overexpression of MUC1 protein on tumor cell surface. The aptamer-cell complexes increased the mass loading of LSAW aptasensor and led to phase shifts of LSAW. The plot of phase shift against the logarithm of concentration of MCF-7 cells was linear over the range from 1 × 10(2) cells mL(-1) to 1 × 10(7) cells mL(-1) with a correlation coefficient of 0.994. The detection limit as low as 32 cells mL(-1) was achieved for MCF-7 cells. The LSAW aptasensor also exhibited excellent specificity and stability. In addition, this aptasensor could be regenerated for ten times without irreversible loss of activity. Therefore, the LSAW aptasensor may offer a promising approach for tumor cell detection and have great potential in clinical applications.
Department of Clinical Laboratory Medicine, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, China.
Kai
K
Chang
Department of Neurology, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, China.
Yan
Y
Pi
Department of Clinical Laboratory Medicine, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, China.
Weiping
W
Lu
Department of Clinical Laboratory Medicine, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, China.
Feng
F
Wang
Department of Clinical Laboratory Medicine, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, China.
Feng
F
Pan
Department of Clinical Laboratory Medicine, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, China.
Fake
F
Li
Department of Clinical Laboratory Medicine, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, China.
Shuangrong
S
Jia
The 26th Research Institute, Chinese Electronic Scientific and Technical Group Company, Chongqing 400060, China.
Jianfeng
J
Shi
Department of Clinical Laboratory Medicine, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, China. Electronic address: dengsl072@yahoo.com.cn.
Shaoli
S
Deng
Department of Clinical Laboratory Medicine, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, Chongqing 400042, China. Electronic address: chenming1971@yahoo.com.
Ming
M
Chen
D000162:Acoustics / Q000295:instrumentation*; D052157:Aptamers, Nucleotide / Q000235:genetics*; D015374:Biosensing Techniques / Q000295:instrumentation*; D001943:Breast Neoplasms / Q000175:diagnosis* / Q000235:genetics*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D061986:MCF-7 Cells; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D046228:Microarray Analysis / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013016:Sound; D013194:Staining and Labeling
D052157:Aptamers, Nucleotide
Aptasensor; Array; Leaky surface acoustic wave; MCF-7 cells