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Sci Rep. 2017 Aug 24;7(1):9312. doi: 10.1038/s41598-017-10133-3.

Magnetic-Immuno-Loop-Mediated Isothermal Amplification Based on DNA Encapsulating Liposome for the Ultrasensitive Detection of P-glycoprotein.

Author information

1
Department of Chemistry and Institute of Biomedical Sciences, Fudan University, Shanghai, 200433, P.R. China.
2
Department of Chemistry and Institute of Biomedical Sciences, Fudan University, Shanghai, 200433, P.R. China. fxech@fudan.edu.cn.
3
Department of Laboratory Diagnosis, Changhai Hospital, Second Military Medical University, 168 Changhai road, Shanghai, 200433, China.
4
Department of Chemistry and Institute of Biomedical Sciences, Fudan University, Shanghai, 200433, P.R. China. jlkong@fudan.edu.cn.

Abstract

Determination of proteins, especially low-abundance proteins with high sensitivity and specificity, is essential for characterizing proteomes and studying their biochemical functions. Herein, a novel Magnetic-Immuno-Loop-Mediated Isothermal Amplification (Im-LAMP) based on DNA-encapsulating liposomes (liposome-Im- LAMP), was developed for trace amounts of proteins. To the best of our knowledge, this is our first report about the magnetic Im-LAMP approach based on liposomes encapsulated template DNA as the detection reagent. The DNA template was released from liposomes and then initiated an Im-LAMP reaction, generating the fluorescence signal with high sensitivity and rapidity. This technique was applied for the determination of P-glycoprotein as a model protein. It was demonstrated that the technique exhibited a dynamic response to P-glycoprotein ranging from 1.6*10-2 to 160 pg/ml with a greatly low detection limit of 5*10-3 pg/ml (5 fg/ml) which is substantially better than conventional enzyme-linked immunosorbent assays (ELISA). This ultra sensitivity was attributed to the LAMP reaction initiated by the enormous DNA targets encapsulated in liposomes. This magnetic liposome-Im-LAMP as an alternative approach is attractive for applications in other low-abundance proteins detection in clinical diagnostics.

PMID:
28839228
PMCID:
PMC5571029
DOI:
10.1038/s41598-017-10133-3
[Indexed for MEDLINE]
Free PMC Article

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