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Single-cell measurement of the uptake, intratumoral distribution using Helios mass cytometer

Mar 22, 2016

We used the recently-developed technique of mass cytometry to measure cisplatin uptake into individual tumor cells (Pt atoms/cell), combined with measurement of the rate of IdU incorporation into DNA (I(127) atoms/cell/min) and tumor hypoxia identified by the 2-nitroimidazole EF5 in cisplatin-treated BxPC-3 and ME-180 xenografts. Pt levels of 10(5) to 10(6) atoms/cell were obtained following a single cisplatin treatment using clinically relevant doses. Cisplatin caused cell cycle arrest in a dose- and time-dependent manner that paralleled effects in vitro, and it readily penetrated into hypoxic tumor regions. Similar levels of Pt/cell were found in xenografts treated with oxaliplatin. Mass cytometry offers the unique capability to study the cellular uptake and anticancer effects of platinum-containing drugs at the single cell level in animal models, and it has the potential for application to samples obtained from cancer patients during treatment.

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