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High-Throughput Bioanalysis of Bevacizumab in Human Plasma Based on Enzyme-Linked Aptamer Assay Using Anti-Idiotype DNA Aptamer

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journal contribution
posted on 22.01.2019 by Tomohiro Yamada, Taro Saito, Yoshia Hill, Yutaka Shimizu, Kaori Tsukakoshi, Hajime Mizuno, Hideki Hayashi, Kazunori Ikebukuro, Toshimasa Toyo’oka, Kenichiro Todoroki
We propose a highly selective, sensitive, accurate, and high-throughput bioanalysis method for bevacizumab utilizing an anti-idiotype DNA aptamer. With this method, bevacizumab in a plasma sample was reacted in a 96-well plate immobilized with the aptamer and further reacted with a protein A–HRP conjugate. The resulting HRP activity was colorimetrically detected using a microplate reader. The calibration curve of bevacizumab ranged from 0.05 to 5.0 μg/mL, and showed a good correlation coefficient (r2 = 1.000). The limit of detection was 2.09 ng/mL. We also demonstrated both the possibility of highly sensitive detection using luminol chemiluminescence and the repeated use of affinity plates. The proposed method is applicable for planning optimal therapeutic programs and for an evaluation of the biological equivalencies in the development of biosimilars.