Abstract
Proteases are involved in cancer‚ taking part in immune (dis)regulation, malignant progression and tumour growth. Recently, it has been found that expression levels of one of the members of the serine protease family, trypsin, is upregulated in human cancer cells of several organs, being considered as a specific cancer biomarker. Considering the great attention that electrochemical peptide sensors have nowadays, in this work, we propose a novel electroanalytical strategy for the determination of this important biomolecule. It implies the immobilization of a short synthetic peptide sequence, dually labelled with fluorescein isothiocyanate (FITC) and biotin, onto neutravidin-modified magnetic beads (MBs), followed by the peptide digestion with trypsin. Upon peptide disruption, the modified MBs were incubated with a specific fluorescein Fab fragment antibody labelled with horseradish peroxidase (HRP-antiFITC) and magnetically captured on the surface of a screen-printed carbon electrode (SPCE), where amperometric detection was performed using the hydroquinone (HQ)/HRP/H2O2 system. The biosensor exhibited a good reproducibility of the measurements (RSD 3.4%, n = 10), and specificity against other proteins and proteases commonly found in biological samples. This work reports the first quantitative data so far on trypsin expression in human cell lysates. The developed bioplatform was used for the direct determination of this protease in lysates from pancreatic cancer, cervix carcinoma and kidney cells in only 3 h and 30 min using low amounts (~ 0.1 μg) of raw extracts.
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Funding
The financial support of the CTQ2015-64402-C2-1-R (Spanish Ministerio de Economía y Competitividad) Research Project and the TRANSNANOAVANSENS-CM Program from the Comunidad de Madrid (Grant S2018/NMT-4349) and predoctoral contract from Universidad Complutense de Madrid (C.M.-S.M.) are gratefully acknowledged. R.B. acknowledges the financial support of the PI17CIII/00045 Grant from the AES-ISCIII program. A.M-C. is a recipient of a FPU fellowship from the Ministerio de Educación, Cultura y Deporte.
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Muñoz-San Martín, C., Pedrero, M., Gamella, M. et al. A novel peptide-based electrochemical biosensor for the determination of a metastasis-linked protease in pancreatic cancer cells. Anal Bioanal Chem 412, 6177–6188 (2020). https://doi.org/10.1007/s00216-020-02418-w
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DOI: https://doi.org/10.1007/s00216-020-02418-w