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Efthymiou G, Radwanska A, Grapa AI, Beghelli-de la Forest Divonne S, Grall D, Schaub S, Hattab M, Pisano S, Poet M, Pisani DF, Counillon L, Descombes X, Blanc-Féraud L, Van Obberghen-Schilling E. Fibronectin Extra Domains tune cellular responses and confer topographically distinct features to fibril networks. J Cell Sci 2021; 134:jcs.252957. [PMID: 33526715 DOI: 10.1242/jcs.252957] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 01/15/2021] [Indexed: 12/25/2022] Open
Abstract
Cellular fibronectin (FN; also known as FN1) variants harboring one or two alternatively spliced so-called extra domains (EDB and EDA) play a central bioregulatory role during development, repair processes and fibrosis. Yet, how the extra domains impact fibrillar assembly and function of the molecule remains unclear. Leveraging a unique biological toolset and image analysis pipeline for direct comparison of the variants, we demonstrate that the presence of one or both extra domains impacts FN assembly, function and physical properties of the matrix. When presented to FN-null fibroblasts, extra domain-containing variants differentially regulate pH homeostasis, survival and TGF-β signaling by tuning the magnitude of cellular responses, rather than triggering independent molecular switches. Numerical analyses of fiber topologies highlight significant differences in variant-specific structural features and provide a first step for the development of a generative model of FN networks to unravel assembly mechanisms and investigate the physical and functional versatility of extracellular matrix landscapes.This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
| | - Agata Radwanska
- Université Côte d'Azur, CNRS, INSERM, iBV, Nice 06108, France
| | - Anca-Ioana Grapa
- Université Côte d'Azur, CNRS, INSERM, iBV, Nice 06108, France.,Université Côte d'Azur, Inria, CNRS, i3S, Nice 06902, France
| | | | - Dominique Grall
- Université Côte d'Azur, CNRS, INSERM, iBV, Nice 06108, France
| | | | - Maurice Hattab
- Université Côte d'Azur, CNRS, INSERM, iBV, Nice 06108, France
| | - Sabrina Pisano
- Université Côte d'Azur, Inserm, CNRS, IRCAN, Nice 06107, France
| | - Mallorie Poet
- Université Côte d'Azur, Inserm, CNRS, IRCAN, Nice 06107, France
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