Abstract
Physical confinement in microfluidic devices has become a common technique to induce and study cell migration in a large range of cell types. Confined migration was previously understudied due to the limitations of 2D migration assays but has emerged as an important mode of migration in the past decade. Furthermore, confinement improves the quality of the imaging and simplifies the analysis of trajectories by confining migration to the plane of acquisition. Protocols described in this chapter relate to methods extending the previously published 2D confinement technique. First, we explain a method to increase the complexity of the confinement chamber by microfabricating nanometer-sized PDMS grooves on the bottom surface, usually used for contact guidance studies. Then, we describe a method to perform the confinement on cells embedded inside a μm-thin 3D collagen gel. Finally, we describe an alternative method to confine cells based on agarose, so that cells can be fixed or drug perfused while being confined, which is currently not possible in the 2D confinement silicone-based device.
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Acknowledgments
We thank Sergii Rudiuk (Ecole Normale Superieure, Paris) for helping with the AFM profiling of the CD-R PDMS replica. We thank Jin Wei (Ecole Normale Superieure, Paris) for helping with the SEM imaging of the CD-R PDMS replica. This work was supported by a French Agence Nationale de la Recherche (ANR) grant to MP (ANR-19-CE13-0030). This work has also received the support of Institut Pierre-Gilles de Gennes-IPGG (équipement d’excellence, “investissements d’avenir,” program ANR-10-EQPX-34) and laboratoire d’excellence, “investissements d’avenir” program ANR-10-IDEX-0001-02 PSL and ANR-10-LABX-31. We also thank the staff members at the Nikon Imaging Center at Institut Curie and the technological platform at Institut Pierre-Gilles de Gennes (IPGG) for providing equipment and technical assistance. JMGA has received funding from Inserm (ITMO Cancer FDV2016), Fondation ARC pour la recherche sur le cancer (DOC20190508743), and a short-term EMBO fellowship (7873).
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1 Electronic Supplementary Material(s)
Video 1
Representative time-lapse images from confocal fluorescence spinning disk microscopy of HeLa Kyoto cells Lifeact-mCherry MYH9-GFP confined under 3 μm over a nanogrooved surface treated with 0,5 mg/ml PLL-g-PEG (ZIP 95994 kb)
Video 2
Representative z-stack images from confocal fluorescence spinning disk microscopy of HeLa Kyoto cells Lifeact-mCherry MYH9-GFP confined under 10 and under 3 μm embedded in a collagen type I gel of 1 mg/mL (ZIP 4981 kb)
Agarose_holder_fluorodish.stl
3D print model for the agarose confiner to be used with glass-bottom FluoroDish™ Petri dishes (WPI) (ZIP 33 kb)
Agarose_holder_TTPdish.stl
3D print model for the agarose confiner to be used with TPP™ Polystyrene Petri dishes (ZIP 31 kb)
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García-Arcos, J.M., Gateau, K., Venkova, L., Piel, M. (2023). Extended Methods for 2D Confinement. In: Margadant, C. (eds) Cell Migration in Three Dimensions. Methods in Molecular Biology, vol 2608. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2887-4_5
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DOI: https://doi.org/10.1007/978-1-0716-2887-4_5
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