Mathematical framework for activity-based cancer biomarkers
Author(s)Kwong, Gabriel A.; Carrodeguas, Emmanuel; Mazumdar, Eric V.; Zekavat, Seyedeh M.; Bhatia, Sangeeta N.; Dudani, Jaideep Sunil; ... Show more Show less
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Advances in nanomedicine are providing sophisticated functions to precisely control the behavior of nanoscale drugs and diagnostics. Strategies that coopt protease activity as molecular triggers are increasingly important in nanoparticle design, yet the pharmacokinetics of these systems are challenging to understand without a quantitative framework to reveal nonintuitive associations. We describe a multicompartment mathematical model to predict strategies for ultrasensitive detection of cancer using synthetic biomarkers, a class of activity-based probes that amplify cancer-derived signals into urine as a noninvasive diagnostic. Using a model formulation made of a PEG core conjugated with protease-cleavable peptides, we explore a vast design space and identify guidelines for increasing sensitivity that depend on critical parameters such as enzyme kinetics, dosage, and probe stability. According to this model, synthetic biomarkers that circulate in stealth but then activate at sites of disease have the theoretical capacity to discriminate tumors as small as 5 mm in diameter—a threshold sensitivity that is otherwise challenging for medical imaging and blood biomarkers to achieve. This model may be adapted to describe the behavior of additional activity-based approaches to allow cross-platform comparisons, and to predict allometric scaling across species.
DepartmentInstitute for Medical Engineering and Science; David H. Koch Institute for Integrative Cancer Research at MIT; Harvard University--MIT Division of Health Sciences and Technology; Massachusetts Institute of Technology. Department of Biological Engineering; Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Proceedings of the National Academy of Sciences
National Academy of Sciences (U.S.)
Kwong, Gabriel A., Jaideep S. Dudani, Emmanuel Carrodeguas, Eric V. Mazumdar, Seyedeh M. Zekavat, and Sangeeta N. Bhatia. “Mathematical Framework for Activity-Based Cancer Biomarkers.” Proc Natl Acad Sci USA 112, no. 41 (September 28, 2015): 12627–12632.
Final published version