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. 2021 May 24;11:10771. doi: 10.1038/s41598-021-90173-y

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Response of MDA-MB-231 and MCF-7 cells to an increase in temperature from 25 to 45 °C. (a) Average displacement curves for 4.5 µm superparamagnetic beads coupled to MDA-MB-231 cells in response to a force of 1 nN. (b) Averaged creep curves for MCF-7 cells. The creep curves of both MCF-7 and MDA-MB-231 cells closely follow a power law. (c) Average creep compliance of MDA-MB-231 and MCF-7 cells as a function of temperature. The average creep compliance was derived from the pre-factor of a power law fit to the respective creep curves. For both cell lines, the creep compliance increases linearly with temperature. (d) Average cell fluidity of MDA-MB-231 and MCF-7 cells. The cell fluidity β is the exponent of the power law fit to the creep curves. Both cell lines become more fluid-like as the temperature increases.