Abstract
Endocytosis is one of the most essential cellular processes, which enables cells to internalise diverse material. It is crucial for regulation of receptor activity and signalling, cell polarisation, attachment and motility, and a great number of other cellular functions. A number of diverse endocytosis pathways are described by now; however, their specificity for different cellular cargoes is poorly resolved. Only few of endocytosis regulators are well-characterised and even less are attributed to the specific cargo. That is very true for the integrin endocytosis pathway, which is a key process in cell migration, adhesion, and signalling. The recent advent of quantitative fluorescent microscopy and cell arrays opened an exciting possibility to systematically characterise molecules playing a role in this crucially important process. Here, we describe a fluorescent screening microscopy-based assay to identify regulators of integrin α2 internalisation. The experimental procedure is the best suited for a highly parallel screening format, such as cell arrays, albeit can be used in single experiments. We provide protocols for sample preparation, fabrication of cell arrays and quantification of integrin α2 internalisation. The approach can be modified to quantify endocytosis of other cargo, and can be used under the conditions of knock-down and knock-in as well as for chemical screening.
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Acknowledgments
The authors would like to acknowledge funding within the Forsys-ViroQuant consortium, Project no. 0313923, as well as by the Federal Ministry of Education and Research (BMBF). The ViroQuant-CellNetworks RNAi Screening core facility is supported by CellNetworks – Cluster of Excellence (EXC81). A.E. is supported by a Landesgraduiertenförderung fellowship from University of Heidelberg, and by the Hartmut Hoffmann-Berling International Graduate School of Molecular and Cellular Biology, University of Heidelberg.
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Erfle, H., Eskova, A., Reymann, J., Starkuviene, V. (2011). Cell Arrays and High-Content Screening. In: Korf, U. (eds) Protein Microarrays. Methods in Molecular Biology, vol 785. Humana Press. https://doi.org/10.1007/978-1-61779-286-1_19
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DOI: https://doi.org/10.1007/978-1-61779-286-1_19
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