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Brault JB, Thouvenot C, Cannata Serio M, Paisant S, Fernandes J, Gény D, Danglot L, Mallet A, Naffakh N. A polarized cell system amenable to subcellular resolution imaging of influenza virus infection. PLoS One 2024; 19:e0292977. [PMID: 38271396 PMCID: PMC10810476 DOI: 10.1371/journal.pone.0292977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 12/28/2023] [Indexed: 01/27/2024] Open
Abstract
The life cycle of influenza A viruses (IAV), and notably intracellular trafficking of the viral genome, depends on multiple interactions with the cellular cytoskeleton and endomembrane system. A limitation of the conventional cellular models used for mechanistic study and subcellular imaging of IAV infection is that they are cultured in two dimensions (2D) under non-polarizing conditions, and therefore they do not recapitulate the intracellular organization of the polarized respiratory epithelial cells naturally targeted by IAVs. To overcome this limitation, we developed an IAV-infection assay in a 3D cell culture system which allows imaging along the baso-lateral axis of polarized cells, with subcellular resolution. Here we describe a protocol to grow polarized monolayers of Caco2-TC7 cells on static Cytodex-3 microcarrier beads, infect them with IAV, and subsequently perform immunostaining and confocal imaging, or electron microscopy, on polarized IAV-infected cells. This method can be extended to other pathogens that infect human polarized epithelial cells.
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Affiliation(s)
- Jean-Baptiste Brault
- Institut Pasteur, Université Paris Cité, CNRS UMR 3569, RNA Biology of Influenza Viruses, Paris, France
| | - Catherine Thouvenot
- Institut Pasteur, Université Paris Cité, C2RT, Ultrastructural BioImaging Unit, Paris, France
| | - Magda Cannata Serio
- Institut Pasteur, Université Paris Cité, CNRS UMR 3569, RNA Biology of Influenza Viruses, Paris, France
| | - Sylvain Paisant
- Institut Pasteur, Université Paris Cité, CNRS UMR 3569, RNA Biology of Influenza Viruses, Paris, France
| | - Julien Fernandes
- Institut Pasteur, Université Paris Cité, C2RT, Unit of Technology and Services Photonic BioImaging, Paris, France
| | - David Gény
- Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, NeurImag Facility, Université Paris Cité, Paris, France
| | - Lydia Danglot
- Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, NeurImag Facility, Université Paris Cité, Paris, France
- Institute of Psychiatry and Neuroscience of Paris (IPNP), INSERM U1266, Membrane Traffic in Healthy and Diseased Brain team, Paris, France
| | - Adeline Mallet
- Institut Pasteur, Université Paris Cité, C2RT, Ultrastructural BioImaging Unit, Paris, France
| | - Nadia Naffakh
- Institut Pasteur, Université Paris Cité, CNRS UMR 3569, RNA Biology of Influenza Viruses, Paris, France
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