Optimization of Apta-Sensing Platform for Detection of Prostate Cancer Marker PCA3

TAKITA, Sarra, NABOK, Alexei, LISHCHUK, Anna and SMITH, David (2021). Optimization of Apta-Sensing Platform for Detection of Prostate Cancer Marker PCA3. International Journal of Molecular Sciences, 22 (23), e12701.

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Official URL: https://www.mdpi.com/1422-0067/22/23/12701
Open Access URL: https://www.mdpi.com/1422-0067/22/23/12701/pdf (Published version)
Link to published version:: https://doi.org/10.3390/ijms222312701
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    This work is a continuation of our research into the development of simple, reliable, and cost-effective methods for the early diagnosis of prostate cancer (PCa). The proposed method is based on the electrochemical detection of the PCA3 biomarker of PCa (long non-coded RNA transcript expressed in urine) using a specific aptamer labeled with a redox group (methylene blue). The electrochemical measurements (cyclic voltammograms) obtained from electrodes functionalized with the aptamer were complemented in this work by another biosensing technique: total internal reflection ellipsometry (TIRE). In addition to proving the concept of the detection of PCA3 in low concentrations down to 90 pM, this study improved our understanding of the processes by which PCA3 binds to its specific aptamer. The high specificity of the binding of PCA3 to the aptamer was assessed by studying the binding kinetics, which yielded an affinity constant (KD) of 2.58 × 10−9 M. Additional XPS measurements confirmed the strong covalent binding of aptamers to gold and showed spectral features associated with PCA3 to aptamer binding.

    Item Type: Article
    Additional Information: ** From MDPI via Jisc Publications Router ** Licence for this article: https://creativecommons.org/licenses/by/4.0/ **Journal IDs: eissn 1422-0067 **History: published 24-11-2021; accepted 21-11-2021
    Uncontrolled Keywords: prostate cancer, PCA3, aptamers, cyclic voltammograms, spectroscopic ellipsometry, XPS
    Identification Number: https://doi.org/10.3390/ijms222312701
    Page Range: e12701
    SWORD Depositor: Colin Knott
    Depositing User: Colin Knott
    Date Deposited: 29 Nov 2021 10:16
    Last Modified: 29 Nov 2021 10:16
    URI: http://shura.shu.ac.uk/id/eprint/29382

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