Abstract
This review provides a summary of known molecular alterations in commonly used cancer models and strives to stipulate how they may affect ambient mass spectrometry profiles. Immortalized cell lines are known to accumulate mutations, and xenografts derived from cell lines are known to contain tumour microenvironment elements from the host animal. While the use of human specimens for mass spectrometry profiling studies is highly encouraged, patient-derived xenografts with low passage numbers could provide an alternative means of amplifying material for ambient MS research when needed. Similarly, genetic preservation of patient tissue seen in some organoid models, further verified by qualitative proteomic and transcriptomic analyses, may argue in favor of organoid suitability for certain ambient profiling studies. However, to choose the appropriate model, pre-evaluation of the model’s molecular characteristics in the context of the research question(s) being asked will likely provide the most appropriate strategy to move research forward. This can be achieved by performing comparative ambient MS analysis of the disease model of choice against a small amount of patient tissue to verify concordance. Disease models, however, will continue to be useful tools to orthogonally validate metabolic states of patient tissues through controlled genetic alterations that are not possible with patient specimens.
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Mass spectrometry research in the Zarrine-Afsar group is currently supported by grants from Princess Margaret Hospital Foundation, Natural Sciences and Engineering Research Council of Canada and Canadian Institutes of Health Research.
Arash Zarrine-Afsar is a consultant with Point Surgical Inc.
Arash Zarrine-Afsar and Michael Woolman are co-inventors of soft ionization for PIRL-MS analysis.
Michael Woolman is supported by a graduate scholarship from the Natural Sciences and Engineering Research Council of Canada.
Lauren Katz is supported by the Ontario Graduate Scholarship program.
Alessandra Tata has no conflicts to declare.
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Published in the topical collection Mass Spectrometry Imaging 2.0 with guest editors Shane R. Ellis and Tiffany Porta Siegel.
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Katz, L., Woolman, M., Tata, A. et al. Potential impact of tissue molecular heterogeneity on ambient mass spectrometry profiles: a note of caution in choosing the right disease model. Anal Bioanal Chem 413, 2655–2664 (2021). https://doi.org/10.1007/s00216-020-03054-0
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DOI: https://doi.org/10.1007/s00216-020-03054-0