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Vignaud T, Copos C, Leterrier C, Toro-Nahuelpan M, Tseng Q, Mahamid J, Blanchoin L, Mogilner A, Théry M, Kurzawa L. Stress fibres are embedded in a contractile cortical network. NATURE MATERIALS 2021; 20:410-420. [PMID: 33077951 PMCID: PMC7610471 DOI: 10.1038/s41563-020-00825-z] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 09/14/2020] [Indexed: 05/06/2023]
Abstract
Contractile actomyosin networks are responsible for the production of intracellular forces. There is increasing evidence that bundles of actin filaments form interconnected and interconvertible structures with the rest of the network. In this study, we explored the mechanical impact of these interconnections on the production and distribution of traction forces throughout the cell. By using a combination of hydrogel micropatterning, traction force microscopy and laser photoablation, we measured the relaxation of traction forces in response to local photoablations. Our experimental results and modelling of the mechanical response of the network revealed that bundles were fully embedded along their entire length in a continuous and contractile network of cortical filaments. Moreover, the propagation of the contraction of these bundles throughout the entire cell was dependent on this embedding. In addition, these bundles appeared to originate from the alignment and coalescence of thin and unattached cortical actin filaments from the surrounding mesh.
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Affiliation(s)
- Timothée Vignaud
- CytoMorpho Lab, Interdisciplinary Research Institute of Grenoble, Laboratoire de Physiologie Cellulaire et Végétale, Grenoble-Alpes University/CEA/CNRS/INRA, Grenoble, France
- CytoMorpho Lab, Hôpital Saint Louis, Institut Universitaire d'Hématologie, Université Paris Diderot/CEA/INSERM, Paris, France
- Clinique de Chirurgie Digestive et Endocrinienne, Hôtel Dieu, Nantes, France
| | - Calina Copos
- Courant Institute and Department of Biology, New York University, New York, NY, USA
| | - Christophe Leterrier
- NeuroCyto, Institute of NeuroPhysiopathology (INP), CNRS, Aix Marseille Université, Marseille, France
| | - Mauricio Toro-Nahuelpan
- Structural and Computational Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Qingzong Tseng
- CytoMorpho Lab, Interdisciplinary Research Institute of Grenoble, Laboratoire de Physiologie Cellulaire et Végétale, Grenoble-Alpes University/CEA/CNRS/INRA, Grenoble, France
- CytoMorpho Lab, Hôpital Saint Louis, Institut Universitaire d'Hématologie, Université Paris Diderot/CEA/INSERM, Paris, France
| | - Julia Mahamid
- Structural and Computational Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Laurent Blanchoin
- CytoMorpho Lab, Interdisciplinary Research Institute of Grenoble, Laboratoire de Physiologie Cellulaire et Végétale, Grenoble-Alpes University/CEA/CNRS/INRA, Grenoble, France
- CytoMorpho Lab, Hôpital Saint Louis, Institut Universitaire d'Hématologie, Université Paris Diderot/CEA/INSERM, Paris, France
| | - Alex Mogilner
- Courant Institute and Department of Biology, New York University, New York, NY, USA.
| | - Manuel Théry
- CytoMorpho Lab, Interdisciplinary Research Institute of Grenoble, Laboratoire de Physiologie Cellulaire et Végétale, Grenoble-Alpes University/CEA/CNRS/INRA, Grenoble, France.
- CytoMorpho Lab, Hôpital Saint Louis, Institut Universitaire d'Hématologie, Université Paris Diderot/CEA/INSERM, Paris, France.
| | - Laetitia Kurzawa
- CytoMorpho Lab, Interdisciplinary Research Institute of Grenoble, Laboratoire de Physiologie Cellulaire et Végétale, Grenoble-Alpes University/CEA/CNRS/INRA, Grenoble, France.
- CytoMorpho Lab, Hôpital Saint Louis, Institut Universitaire d'Hématologie, Université Paris Diderot/CEA/INSERM, Paris, France.
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Toro-Nahuelpan M, Zagoriy I, Senger F, Blanchoin L, Théry M, Mahamid J. Tailoring cryo-electron microscopy grids by photo-micropatterning for in-cell structural studies. Nat Methods 2020; 17:50-54. [PMID: 31740821 DOI: 10.21203/rs.2.12377/v1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 10/07/2019] [Indexed: 05/22/2023]
Abstract
Spatially controlled cell adhesion on electron microscopy supports remains a bottleneck in specimen preparation for cellular cryo-electron tomography. Here, we describe contactless and mask-free photo-micropatterning of electron microscopy grids for site-specific deposition of extracellular matrix-related proteins. We attained refined cell positioning for micromachining by cryo-focused ion beam milling. Complex micropatterns generated predictable intracellular organization, allowing direct correlation between cell architecture and in-cell three-dimensional structural characterization of the underlying molecular machinery.
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Affiliation(s)
- Mauricio Toro-Nahuelpan
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Ievgeniia Zagoriy
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany
| | - Fabrice Senger
- CytomorphoLab, Interdisciplinary Research Institute of Grenoble, Laboratoire de Physiologie Cellulaire et Végétale, Université Grenoble-Alpes/CEA/CNRS/INRA, Grenoble, France
| | - Laurent Blanchoin
- CytomorphoLab, Interdisciplinary Research Institute of Grenoble, Laboratoire de Physiologie Cellulaire et Végétale, Université Grenoble-Alpes/CEA/CNRS/INRA, Grenoble, France
- CytomorphoLab, Hôpital Saint Louis, Institut Universitaire d'Hématologie, Université Paris Diderot, Paris, France
| | - Manuel Théry
- CytomorphoLab, Interdisciplinary Research Institute of Grenoble, Laboratoire de Physiologie Cellulaire et Végétale, Université Grenoble-Alpes/CEA/CNRS/INRA, Grenoble, France
- CytomorphoLab, Hôpital Saint Louis, Institut Universitaire d'Hématologie, Université Paris Diderot, Paris, France
| | - Julia Mahamid
- Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany.
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Tailoring cryo-electron microscopy grids by photo-micropatterning for in-cell structural studies. Nat Methods 2019; 17:50-54. [PMID: 31740821 PMCID: PMC6949126 DOI: 10.1038/s41592-019-0630-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 10/07/2019] [Indexed: 01/01/2023]
Abstract
Spatially-controlled cell adhesion on electron microscopy (EM) supports remains a
bottleneck in specimen preparation for cellular cryo-electron tomography. Here,
we describe contactless and mask-free photo-micropatterning of EM grids for
site-specific deposition of extracellular matrix (ECM)-related proteins. We
attained refined cell positioning for micromachining by cryo-focused ion beam
milling. Complex micropatterns generated predictable intracellular organization,
allowing direct correlation between cell architecture and
in-cell 3D-structural characterization of the underlying
molecular machinery.
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