Mass cytometry enables high-dimensional, single-cell analysis of cell type and state. In mass cytometry, rare earth metals are used as reporters on antibodies. Analysis of metal abundances using the mass cytometer allows determination of marker expression in individual cells. Mass cytometry has previously been applied only to cell suspensions. To gain spatial information, we have coupled immunohistochemical and immunocytochemical methods with high-resolution laser ablation to CyTOF mass cytometry. This approach enables the simultaneous imaging of 32 proteins and protein modifications at subcellular resolution; with the availability of additional isotopes, measurement of over 100 markers will be possible. We applied imaging mass cytometry to human breast cancer samples, allowing delineation of cell subpopulations and cell-cell interactions and highlighting tumor heterogeneity. Imaging mass cytometry complements existing imaging approaches. It will enable basic studies of tissue heterogeneity and function and support the transition of medicine toward individualized molecularly targeted diagnosis and therapies.
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We thank M. Storz for preparing the histological slides and the TMA sections; S. Dettwiler, A. Bohnert, A. Fitsche; the entire Trace Element and Micro Analysis group at ETH Zürich for their experimental support and discussions; N. Daga and C. von Mering for their feedback on data analysis; the ETHZ LAC workshop for their support in design and construction of the laser ablation chamber; and the Lehner and Luschnig groups for giving us access to their immunofluorescence microscopes. This work was supported by a Society in Science, The Branco Weiss Fellowship, administered by the ETH Zürich (C.G.); the Swiss National Science Foundation (SNSF) project grants 200021-119779 (H.A.O.W.), 200021-119779 (D. Günther), 31003A-143877 (D. Günther) and 31003A-143877 (B.B.); an ETH Zürich Pioneer Fellowship (H.A.O.W.); the SystemsX PhosphoNet-PPM grant (P.J.W. and B.B.); a Baugarten Foundation grant (SGGP) (P.J.W.); a EU VIGOR++ project FP7/2007-2013, #270379 (P.J.S. and J.M.B.); an SNSF R'Equip grant 316030-139220 (B.B.); an SNSF Assistant Professorship grant PP00P3-144874 (B.B.); a Swiss Cancer League grant (B.B.); and funding from the European Research Council (ERC) under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement no. 336921 (B.B.).
Fluidigm (formerly DVS Sciences) has an option to license imaging mass cytometry technology from D. Günther represented by ETH Zürich, which includes a related funded research collaboration benefiting the D. Günther and B.B. labs.
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Giesen, C., Wang, H., Schapiro, D. et al. Highly multiplexed imaging of tumor tissues with subcellular resolution by mass cytometry. Nat Methods 11, 417–422 (2014). https://doi.org/10.1038/nmeth.2869
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