Tumour-associated macrophages act as a slow-release reservoir of nano-therapeutic Pt(IV) pro-drug
Author(s)
Miller, Miles Aaron; Zheng, Yao-Rong; Gadde, Suresh; Pfirschke, Christina; Zope, Harshal; Engblom, Camilla; Kohler, Rainer H.; Iwamoto, Yoshiko; Yang, Katherine S.; Askevold, Bjorn; Kolishetti, Nagesh; Pittet, Mikael; Lippard, Stephen J.; Farokhzad, Omid C.; Weissleder, Ralph; ... Show more Show less
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Therapeutic nanoparticles (TNPs) aim to deliver drugs more safely and effectively to cancers, yet clinical results have been unpredictable owing to limited in vivo understanding. Here we use single-cell imaging of intratumoral TNP pharmacokinetics and pharmacodynamics to better comprehend their heterogeneous behaviour. Model TNPs comprising a fluorescent platinum(IV) pro-drug and a clinically tested polymer platform (PLGA-b-PEG) promote long drug circulation and alter accumulation by directing cellular uptake toward tumour-associated macrophages (TAMs). Simultaneous imaging of TNP vehicle, its drug payload and single-cell DNA damage response reveals that TAMs serve as a local drug depot that accumulates significant vehicle from which DNA-damaging Pt payload gradually releases to neighbouring tumour cells. Correspondingly, TAM depletion reduces intratumoral TNP accumulation and efficacy. Thus, nanotherapeutics co-opt TAMs for drug delivery, which has implications for TNP design and for selecting patients into trials.
Date issued
2015-10Department
Massachusetts Institute of Technology. Department of ChemistryJournal
Nature Communications
Publisher
Nature Publishing Group
Citation
Miller, Miles A., Yao-Rong Zheng, Suresh Gadde, Christina Pfirschke, Harshal Zope, Camilla Engblom, Rainer H. Kohler, et al. “Tumour-Associated Macrophages Act as a Slow-Release Reservoir of Nano-Therapeutic Pt(IV) Pro-Drug.” Nat Comms 6 (October 27, 2015): 8692. © 2015 Macmillan Publishers Limited
Version: Final published version
ISSN
2041-1723