Molecular biomarkers can be used as objective indicators of pathologic processes. Although their levels often change over time, their measurement is often constrained to a single time point. Cumulative biomarker exposure would provide a fundamentally different kind of measurement to what is available in the clinic. Magnetic resonance relaxometry can be used to noninvasively monitor changes in the relaxation properties of antibody-coated magnetic particles when they aggregate upon exposure to a biomarker of interest. We used implantable devices containing such sensors to continuously profile changes in three clinically relevant cardiac biomarkers at physiological levels for up to 72 h. Sensor response differed between experimental and control groups in a mouse model of myocardial infarction and correlated with infarct size. Our prototype for a biomarker monitoring device also detected doxorubicin-induced cardiotoxicity and can be adapted to detect other molecular biomarkers with a sensitivity as low as the pg/ml range.
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This work was supported by National Cancer Institute Centers of Cancer Nanotechnology Excellence no. 5 U54 CA119349-12 and CA151844 grants and National Science Foundation Division of Materials Research Award no. 0746264. Y.L. was supported by a National Defense Science and Engineering Graduate fellowship. T.P. was supported by an American Heart Association fellowship.
M.J.C. is a director at T2 Biosystems, a company developing in vitro diagnostic assays.
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Ling, Y., Pong, T., Vassiliou, C. et al. Implantable magnetic relaxation sensors measure cumulative exposure to cardiac biomarkers. Nat Biotechnol 29, 273–277 (2011). https://doi.org/10.1038/nbt.1780
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