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. 2017 Aug 31;7:10113. doi: 10.1038/s41598-017-10708-0

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© The Author(s) 2017

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Activation of the mTOR signaling pathway during spheroid formation on chitosan film. (a, Left panel) After 48 hr of seeding on monolayer or with chitosan coating (Spheroid), cell lysates were analyzed using the Human Phospho-MAPK Array kit. (a, Right panel) the spots of phospho-mTOR (S2448) were analyzed by an image analysis system. (b and c) Whole-cell lysates were analyzed by western blotting with specific antibodies against indicated molecules. β-tubulin and actin were used as the loading control. (d) Immunostaining of p-mTOR (S2448), p-S6 (S235), and p-4EBP1 in 3D spheres. DAPI merged images are shown in the low panel. Scale bar = 50 μM. The results are expressed as the mean ± standard deviation of three independent experiments, which is representative of MSCs from two individuals. **p < 0.01 compared with monolayer cells.