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Tanaka J, Kuwajima H, Yuki R, Nakayama Y. Simvastatin activates the spindle assembly checkpoint and causes abnormal cell division by modifying small GTPases. Cell Signal 2024; 119:111172. [PMID: 38604342 DOI: 10.1016/j.cellsig.2024.111172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 04/06/2024] [Accepted: 04/08/2024] [Indexed: 04/13/2024]
Abstract
Simvastatin is an inhibitor of 3-hydroxy-3-methylglutaryl-CoA (HMG-CoA) reductase, which is a rate-limiting enzyme of the cholesterol synthesis pathway. It has been used clinically as a lipid-lowering agent to reduce low-density lipoprotein (LDL) cholesterol levels. In addition, antitumor activity has been demonstrated. Although simvastatin attenuates the prenylation of small GTPases, its effects on cell division in which small GTPases play an important role, have not been examined as a mechanism underlying its cytostatic effects. In this study, we determined its effect on cell division. Cell cycle synchronization experiments revealed a delay in mitotic progression in simvastatin-treated cells at concentrations lower than the IC50. Time-lapse imaging analysis indicated that the duration of mitosis, especially from mitotic entry to anaphase onset, was prolonged. In addition, simvastatin increased the number of cells exhibiting misoriented anaphase/telophase and bleb formation. Inhibition of the spindle assembly checkpoint (SAC) kinase Mps1 canceled the mitotic delay. Additionally, the number of cells exhibiting kinetochore localization of BubR1, an essential component of SAC, was increased, suggesting an involvement of SAC in the mitotic delay. Enhancement of F-actin formation and cell rounding at mitotic entry indicates that cortical actin dynamics were affected by simvastatin. The cholesterol removal agent methyl-β-cyclodextrin (MβCD) accelerated mitotic progression differently from simvastatin, suggesting that cholesterol loss from the plasma membrane is not involved in the mitotic delay. Of note, the small GTPase RhoA, which is a critical factor for cortical actin dynamics, exhibited upregulated expression. In addition, Rap1 was likely not geranylgeranylated. Our results demonstrate that simvastatin affects actin dynamics by modifying small GTPases, thereby activating the spindle assembly checkpoint and causing abnormal cell division.
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Affiliation(s)
- Junna Tanaka
- Laboratory of Biochemistry and Molecular Biology, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan
| | - Hiroki Kuwajima
- Laboratory of Biochemistry and Molecular Biology, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan
| | - Ryuzaburo Yuki
- Laboratory of Biochemistry and Molecular Biology, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan
| | - Yuji Nakayama
- Laboratory of Biochemistry and Molecular Biology, Kyoto Pharmaceutical University, Kyoto 607-8414, Japan.
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2
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Haake SM, Rios BL, Pozzi A, Zent R. Integrating integrins with the hallmarks of cancer. Matrix Biol 2024; 130:20-35. [PMID: 38677444 DOI: 10.1016/j.matbio.2024.04.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 04/02/2024] [Accepted: 04/23/2024] [Indexed: 04/29/2024]
Abstract
Epithelial cells adhere to a specialized extracellular matrix called the basement membrane which allows them to polarize and form epithelial tissues. The extracellular matrix provides essential physical scaffolding and biochemical and biophysical cues required for tissue morphogenesis, differentiation, function, and homeostasis. Epithelial cell adhesion to the extracellular matrix (i.e., basement membrane) plays a critical role in organizing epithelial tissues, separating the epithelial cells from the stroma. Epithelial cell detachment from the basement membrane classically results in death, though detachment or invasion through the basement membrane represents a critical step in carcinogenesis. Epithelial cells bind to the extracellular matrix via specialized matrix receptors, including integrins. Integrins are transmembrane receptors that form a mechanical linkage between the extracellular matrix and the intracellular cytoskeleton and are required for anchorage-dependent cellular functions such as proliferation, migration, and invasion. The role of integrins in the development, growth, and dissemination of multiple types of carcinomas has been investigated by numerous methodologies, which has led to great complexity. To organize this vast array of information, we have utilized the "Hallmarks of Cancer" from Hanahan and Weinberg as a convenient framework to discuss the role of integrins in the pathogenesis of cancers. This review explores this biology and how its complexity has impacted the development of integrin-targeted anti-cancer therapeutics.
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Affiliation(s)
- Scott M Haake
- Division of Hematology, Oncology, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Veterans Affairs, Nashville, TN, USA; Vanderbilt-Ingram Cancer Center, Nashville, TN, USA; Cancer Biology Program, Vanderbilt University, Nashville, TN, USA.
| | - Brenda L Rios
- Vanderbilt-Ingram Cancer Center, Nashville, TN, USA; Cancer Biology Program, Vanderbilt University, Nashville, TN, USA
| | - Ambra Pozzi
- Department of Veterans Affairs, Nashville, TN, USA; Vanderbilt-Ingram Cancer Center, Nashville, TN, USA; Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Roy Zent
- Department of Veterans Affairs, Nashville, TN, USA; Vanderbilt-Ingram Cancer Center, Nashville, TN, USA; Cancer Biology Program, Vanderbilt University, Nashville, TN, USA; Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Cell and Developmental Biology, Vanderbilt University, Nashville, TN, USA
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3
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Craig EM, Oprea F, Alam S, Grodsky A, Miller KE. A simple active fluid model unites cytokinesis, cell crawling, and axonal outgrowth. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.05.22.595337. [PMID: 38826455 PMCID: PMC11142150 DOI: 10.1101/2024.05.22.595337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
Axonal outgrowth, cell crawling, and cytokinesis utilize actomyosin, microtubule-based motors, cytoskeletal dynamics, and substrate adhesions to produce traction forces and bulk cellular motion. While it has long been appreciated that growth cones resemble crawling cells and that the mechanisms that drive cytokinesis help power cell crawling, they are typically viewed as unique processes. To better understand the relationship between these modes of motility, here, we developed a unified active fluid model of cytokinesis, amoeboid migration, mesenchymal migration, neuronal migration, and axonal outgrowth in terms of cytoskeletal flow, adhesions, viscosity, and force generation. Using numerical modeling, we fit subcellular velocity profiles of the motions of cytoskeletal structures and docked organelles from previously published studies to infer underlying patterns of force generation and adhesion. Our results indicate that, during cytokinesis, there is a primary converge zone at the cleavage furrow that drives flow towards it; adhesions are symmetric across the cell, and as a result, cells are stationary. In mesenchymal, amoeboid, and neuronal migration, the site of the converge zone shifts, and differences in adhesion between the front and back of the cell drive crawling. During neuronal migration and axonal outgrowth, the primary convergence zone lies within the growth cone, which drives actin retrograde flow in the P-domain and bulk anterograde flow of the axonal shaft. They differ in that during neuronal migration, the cell body is weakly attached to the substrate and thus moves forward at the same velocity as the axon. In contrast, during axonal outgrowth, the cell body strongly adheres to the substrate and remains stationary, resulting in a decrease in flow velocity away from the growth cone. The simplicity with which cytokinesis, cell crawling, and axonal outgrowth can be modeled by varying coefficients in a simple model suggests a deep connection between them.
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Affiliation(s)
- Erin M Craig
- Central Washington University, Department of Physics, 400 E. University Way, Ellensburg, WA 98926-7422, USA
| | - Francesca Oprea
- Department of Integrative Biology, Michigan State University, East Lansing, MI 48824, USA
| | - Sajid Alam
- Department of Integrative Biology, Michigan State University, East Lansing, MI 48824, USA
| | - Ania Grodsky
- Department of Integrative Biology, Michigan State University, East Lansing, MI 48824, USA
| | - Kyle E Miller
- Department of Integrative Biology, Michigan State University, East Lansing, MI 48824, USA
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4
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Lima JT, Pereira AJ, Ferreira JG. The LINC complex ensures accurate centrosome positioning during prophase. Life Sci Alliance 2024; 7:e202302404. [PMID: 38228373 DOI: 10.26508/lsa.202302404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 01/03/2024] [Accepted: 01/04/2024] [Indexed: 01/18/2024] Open
Abstract
Accurate centrosome separation and positioning during early mitosis relies on force-generating mechanisms regulated by a combination of extracellular, cytoplasmic, and nuclear cues. The identity of the nuclear cues involved in this process remains largely unknown. Here, we investigate how the prophase nucleus contributes to centrosome positioning during the initial stages of mitosis, using a combination of cell micropatterning, high-resolution live-cell imaging, and quantitative 3D cellular reconstruction. We show that in untransformed RPE-1 cells, centrosome positioning is regulated by a nuclear signal, independently of external cues. This nuclear mechanism relies on the linker of nucleoskeleton and cytoskeleton complex that controls the timely loading of dynein on the nuclear envelope (NE), providing spatial cues for robust centrosome positioning on the shortest nuclear axis, before nuclear envelope permeabilization. Our results demonstrate how nuclear-cytoskeletal coupling maintains a robust centrosome positioning mechanism to ensure efficient mitotic spindle assembly.
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Affiliation(s)
- Joana T Lima
- https://ror.org/04wjk1035 Instituto de Investigação e Inovação em Saúde (i3S), Porto, Portugal
- Departamento de Biomedicina, Faculdade de Medicina do Porto, Unidade de Biologia Experimental, Porto, Portugal
- https://ror.org/04wjk1035 Programa Doutoral em Biomedicina, Faculdade de Medicina, Universidade do Porto, Porto, Portugal
| | - António J Pereira
- https://ror.org/04wjk1035 Instituto de Investigação e Inovação em Saúde (i3S), Porto, Portugal
| | - Jorge G Ferreira
- https://ror.org/04wjk1035 Instituto de Investigação e Inovação em Saúde (i3S), Porto, Portugal
- Departamento de Biomedicina, Faculdade de Medicina do Porto, Unidade de Biologia Experimental, Porto, Portugal
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5
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Ganguli S, Wyatt T, Nyga A, Lawson RH, Meyer T, Baum B, Matthews HK. Oncogenic Ras deregulates cell-substrate interactions during mitotic rounding and respreading to alter cell division orientation. Curr Biol 2023; 33:2728-2741.e3. [PMID: 37343559 PMCID: PMC7614879 DOI: 10.1016/j.cub.2023.05.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 04/21/2023] [Accepted: 05/25/2023] [Indexed: 06/23/2023]
Abstract
Oncogenic Ras has been shown to change the way cancer cells divide by increasing the forces generated during mitotic rounding. In this way, RasV12 enables cancer cells to divide across a wider range of mechanical environments than normal cells. Here, we identify a further role for oncogenic Ras-ERK signaling in division by showing that RasV12 expression alters the shape, division orientation, and respreading dynamics of cells as they exit mitosis. Many of these effects appear to result from the impact of RasV12 signaling on actomyosin contractility, because RasV12 induces the severing of retraction fibers that normally guide spindle positioning and provide a memory of the interphase cell shape. In support of this idea, the RasV12 phenotype is reversed by inhibition of actomyosin contractility and can be mimicked by the loss of cell-substrate adhesion during mitosis. Finally, we show that RasV12 activation also perturbs division orientation in cells cultured in 2D epithelial monolayers and 3D spheroids. Thus, the induction of oncogenic Ras-ERK signaling leads to rapid changes in division orientation that, along with the effects of RasV12 on cell growth and cell-cycle progression, are likely to disrupt epithelial tissue organization and contribute to cancer dissemination.
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Affiliation(s)
- Sushila Ganguli
- Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK
| | - Tom Wyatt
- Laboratoirè Matiere et Systèmes Complexes, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, Bâtiment Condorcet, 75013 Paris, France
| | - Agata Nyga
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK
| | - Rachel H Lawson
- School of Biosciences, University of Sheffield, Western Bank, Sheffield S10 2TN, UK
| | - Tim Meyer
- UCL Cancer Institute, University College London, 72 Huntley Street, London WC1E 6DD, UK
| | - Buzz Baum
- Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK; MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
| | - Helen K Matthews
- Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK; School of Biosciences, University of Sheffield, Western Bank, Sheffield S10 2TN, UK.
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6
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Nyga A, Plak K, Kräter M, Urbanska M, Kim K, Guck J, Baum B. Dynamics of cell rounding during detachment. iScience 2023; 26:106696. [PMID: 37168576 PMCID: PMC10165398 DOI: 10.1016/j.isci.2023.106696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 02/24/2023] [Accepted: 04/13/2023] [Indexed: 05/13/2023] Open
Abstract
Animal cells undergo repeated shape changes, for example by rounding up and respreading as they divide. Cell rounding can be also observed in interphase cells, for example when cancer cells switch from a mesenchymal to an ameboid mode of cell migration. Nevertheless, it remains unclear how interphase cells round up. In this article, we demonstrate that a partial loss of substrate adhesion triggers actomyosin-dependent cortical remodeling and ERM activation, which facilitates further adhesion loss causing cells to round. Although the path of rounding in this case superficially resembles mitotic rounding in involving ERM phosphorylation, retraction fiber formation, and cortical remodeling downstream of ROCK, it does not require Ect2. This work provides insights into the way partial loss of adhesion actives cortical remodeling to drive cell detachment from the substrate. This is important to consider when studying the mechanics of cells in suspension, for example using methods like real-time deformability cytometry (RT-DC).
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Affiliation(s)
- Agata Nyga
- Cell Biology, MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK
| | - Katarzyna Plak
- MRC Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
| | - Martin Kräter
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
- Max Planck Institute for the Science of Light & Max-Planck-Zentrum für Physik und Medizin, 91058 Erlangen, Germany
| | - Marta Urbanska
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
- Max Planck Institute for the Science of Light & Max-Planck-Zentrum für Physik und Medizin, 91058 Erlangen, Germany
| | - Kyoohyun Kim
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
- Max Planck Institute for the Science of Light & Max-Planck-Zentrum für Physik und Medizin, 91058 Erlangen, Germany
| | - Jochen Guck
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, 01307 Dresden, Germany
- Max Planck Institute for the Science of Light & Max-Planck-Zentrum für Physik und Medizin, 91058 Erlangen, Germany
| | - Buzz Baum
- Cell Biology, MRC Laboratory of Molecular Biology, Cambridge CB2 0QH, UK
- MRC Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
- Institute for the Physics of Living Systems, University College London, London WC1E 6BT, UK
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7
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B.R. R, Shah N, Joshi P, Madhusudan MS, Balasubramanian N. Kinetics of Arf1 inactivation regulates Golgi organisation and function in non-adherent fibroblasts. Biol Open 2023; 12:bio059669. [PMID: 36946871 PMCID: PMC10187640 DOI: 10.1242/bio.059669] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 03/13/2023] [Indexed: 03/23/2023] Open
Abstract
Arf1 belongs to the Arf family of small GTPases that localise at the Golgi and plasma membrane. Active Arf1 plays a crucial role in regulating Golgi organisation and function. In mouse fibroblasts, loss of adhesion triggers a consistent drop (∼50%) in Arf1 activation that causes the Golgi to disorganise but not fragment. In suspended cells, the trans-Golgi (GalTase) disperses more prominently than cis-Golgi (Man II), accompanied by increased active Arf1 (detected using GFP-ABD: ARHGAP10 Arf1 binding domain) associated with the cis-Golgi compartment. Re-adhesion restores Arf1 activation at the trans-Golgi as it reorganises. Arf1 activation at the Golgi is regulated by Arf1 Guanine nucleotide exchange factors (GEFs), GBF1, and BIG1/2. In non-adherent fibroblasts, the cis-medial Golgi provides a unique setting to test and understand the role GEF-mediated Arf1 activation has in regulating Golgi organisation. Labelled with Man II-GFP, non-adherent fibroblasts treated with increasing concentrations of Brefeldin-A (BFA) (which inhibits BIG1/2 and GBF1) or Golgicide A (GCA) (which inhibits GBF1 only) comparably decrease active Arf1 levels. They, however, cause a concentration-dependent increase in cis-medial Golgi fragmentation and fusion with the endoplasmic reticulum (ER). Using selected BFA and GCA concentrations, we find a change in the kinetics of Arf1 inactivation could mediate this by regulating cis-medial Golgi localisation of GBF1. On loss of adhesion, a ∼50% drop in Arf1 activation over 120 min causes the Golgi to disorganise. The kinetics of this drop, when altered by BFA or GCA treatment causes a similar decline in Arf1 activation but over 10 min. This causes the Golgi to now fragment which affects cell surface glycosylation and re-adherent cell spreading. Using non-adherent fibroblasts this study reveals the kinetics of Arf1 inactivation, with active Arf1 levels, to be vital for Golgi organisation and function.
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Affiliation(s)
- Rajeshwari B.R.
- Indian Institute of Science Education and Research (IISER) Pune, Dr Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
| | - Nikita Shah
- Indian Institute of Science Education and Research (IISER) Pune, Dr Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
| | - Prachi Joshi
- Indian Institute of Science Education and Research (IISER) Pune, Dr Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
| | - M. S. Madhusudan
- Indian Institute of Science Education and Research (IISER) Pune, Dr Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
| | - Nagaraj Balasubramanian
- Indian Institute of Science Education and Research (IISER) Pune, Dr Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India
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8
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Huber M, Casares-Arias J, Fässler R, Müller DJ, Strohmeyer N. In mitosis integrins reduce adhesion to extracellular matrix and strengthen adhesion to adjacent cells. Nat Commun 2023; 14:2143. [PMID: 37059721 PMCID: PMC10104879 DOI: 10.1038/s41467-023-37760-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 03/29/2023] [Indexed: 04/16/2023] Open
Abstract
To enter mitosis, most adherent animal cells reduce adhesion, which is followed by cell rounding. How mitotic cells regulate adhesion to neighboring cells and extracellular matrix (ECM) proteins is poorly understood. Here we report that, similar to interphase, mitotic cells can employ integrins to initiate adhesion to the ECM in a kindlin- and talin-dependent manner. However, unlike interphase cells, we find that mitotic cells cannot engage newly bound integrins to actomyosin via talin or vinculin to reinforce adhesion. We show that the missing actin connection of newly bound integrins leads to transient ECM-binding and prevents cell spreading during mitosis. Furthermore, β1 integrins strengthen the adhesion of mitotic cells to adjacent cells, which is supported by vinculin, kindlin, and talin1. We conclude that this dual role of integrins in mitosis weakens the cell-ECM adhesion and strengthens the cell-cell adhesion to prevent delamination of the rounding and dividing cell.
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Affiliation(s)
- Maximilian Huber
- Department of Biosystems Science and Engineering, Eidgenössische Technische Hochschule (ETH) Zurich, 4058, Basel, Switzerland
| | - Javier Casares-Arias
- Department of Biosystems Science and Engineering, Eidgenössische Technische Hochschule (ETH) Zurich, 4058, Basel, Switzerland
| | - Reinhard Fässler
- Department of Molecular Medicine, Max Planck Institute of Biochemistry, 82152, Martinsried, Germany
| | - Daniel J Müller
- Department of Biosystems Science and Engineering, Eidgenössische Technische Hochschule (ETH) Zurich, 4058, Basel, Switzerland.
| | - Nico Strohmeyer
- Department of Biosystems Science and Engineering, Eidgenössische Technische Hochschule (ETH) Zurich, 4058, Basel, Switzerland.
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9
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Lodde V, Garcia Barros R, Terzaghi L, Franciosi F, Luciano AM. Insights on the Role of PGRMC1 in Mitotic and Meiotic Cell Division. Cancers (Basel) 2022; 14:cancers14235755. [PMID: 36497237 PMCID: PMC9736406 DOI: 10.3390/cancers14235755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 11/20/2022] [Accepted: 11/21/2022] [Indexed: 11/25/2022] Open
Abstract
During mitosis, chromosome missegregation and cytokinesis defects have been recognized as hallmarks of cancer cells. Cytoskeletal elements composing the spindle and the contractile ring and their associated proteins play crucial roles in the faithful progression of mitotic cell division. The hypothesis that PGRMC1, most likely as a part of a yet-to-be-defined complex, is involved in the regulation of spindle function and, more broadly, the cytoskeletal machinery driving cell division is particularly appealing. Nevertheless, more than ten years after the preliminary observation that PGRMC1 changes its localization dynamically during meiotic and mitotic cell division, this field of research has remained a niche and needs to be fully explored. To encourage research in this fascinating field, in this review, we will recap the current knowledge on PGRMC1 function during mitotic and meiotic cell division, critically highlighting the strengths and limitations of the experimental approaches used so far. We will focus on known interacting partners as well as new putative associated proteins that have recently arisen in the literature and that might support current as well as new hypotheses of a role for PGRMC1 in specific spindle subcompartments, such as the centrosome, kinetochores, and the midzone/midbody.
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10
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Fan S, Boerner K, Muraleedharan CK, Nusrat A, Quiros M, Parkos CA. Epithelial JAM-A is fundamental for intestinal wound repair in vivo. JCI Insight 2022; 7:e158934. [PMID: 35943805 PMCID: PMC9536273 DOI: 10.1172/jci.insight.158934] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 08/03/2022] [Indexed: 12/01/2022] Open
Abstract
Junctional adhesion molecule-A (JAM-A) is expressed in several cell types, including epithelial and endothelial cells, as well as some leukocytes. In intestinal epithelial cells (IEC), JAM-A localizes to cell junctions and plays a role in regulating barrier function. In vitro studies with model cell lines have shown that JAM-A contributes to IEC migration; however, in vivo studies investigating the role of JAM-A in cell migration-dependent processes such as mucosal wound repair have not been performed. In this study, we developed an inducible intestinal epithelial-specific JAM-A-knockdown mouse model (Jam-aERΔIEC). While acute induction of IEC-specific loss of JAM-A did not result in spontaneous colitis, such mice had significantly impaired mucosal healing after chemically induced colitis and after biopsy colonic wounding. In vitro primary cultures of JAM-A-deficient IEC demonstrated impaired migration in wound healing assays. Mechanistic studies revealed that JAM-A stabilizes formation of protein signaling complexes containing Rap1A/Talin/β1 integrin at focal adhesions of migrating IECs. Loss of JAM-A in primary IEC led to decreased Rap1A activity and protein levels of Talin and β1 integrin, and it led to a reduction in focal adhesion structures. These findings suggest that epithelial JAM-A plays a critical role in controlling mucosal repair in vivo through dynamic regulation of focal adhesions.
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11
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Cell Cycle Regulation by Integrin-Mediated Adhesion. Cells 2022; 11:cells11162521. [PMID: 36010598 PMCID: PMC9406542 DOI: 10.3390/cells11162521] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/08/2022] [Accepted: 08/11/2022] [Indexed: 11/23/2022] Open
Abstract
Cell cycle and cell adhesion are two interdependent cellular processes regulating each other, reciprocally, in every cell cycle phase. The cell adhesion to the extracellular matrix (ECM) via integrin receptors triggers signaling pathways required for the cell cycle progression; the passage from the G1 to S phase and the completion of cytokinesis are the best-understood events. Growing evidence, however, suggests more adhesion-dependent regulatory aspects of the cell cycle, particularly during G2 to M transition and early mitosis. Conversely, the cell cycle machinery regulates cell adhesion in manners recently shown driven mainly by cyclin-dependent kinase 1 (CDK1). This review summarizes the recent findings regarding the role of integrin-mediated cell adhesion and its downstream signaling components in regulating the cell cycle, emphasizing the cell cycle progression through the G2 and early M phases. Further investigations are required to raise our knowledge about the molecular mechanisms of crosstalk between cell adhesion and the cell cycle in detail.
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12
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Fine-tuning cell organelle dynamics during mitosis by small GTPases. Front Med 2022; 16:339-357. [PMID: 35759087 DOI: 10.1007/s11684-022-0926-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 02/24/2022] [Indexed: 11/04/2022]
Abstract
During mitosis, the allocation of genetic material concurs with organelle transformation and distribution. The coordination of genetic material inheritance with organelle dynamics directs accurate mitotic progression, cell fate determination, and organismal homeostasis. Small GTPases belonging to the Ras superfamily regulate various cell organelles during division. Being the key regulators of membrane dynamics, the dysregulation of small GTPases is widely associated with cell organelle disruption in neoplastic and non-neoplastic diseases, such as cancer and Alzheimer's disease. Recent discoveries shed light on the molecular properties of small GTPases as sophisticated modulators of a remarkably complex and perfect adaptors for rapid structure reformation. This review collects current knowledge on small GTPases in the regulation of cell organelles during mitosis and highlights the mediator role of small GTPase in transducing cell cycle signaling to organelle dynamics during mitosis.
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13
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Leguay K, Decelle B, Elkholi IE, Bouvier M, Côté JF, Carréno S. Interphase microtubule disassembly is a signaling cue that drives cell rounding at mitotic entry. J Cell Biol 2022; 221:213183. [PMID: 35482006 DOI: 10.1083/jcb.202109065] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 02/03/2022] [Accepted: 04/05/2022] [Indexed: 11/22/2022] Open
Abstract
At mitotic entry, reorganization of the actomyosin cortex prompts cells to round-up. Proteins of the ezrin, radixin, and moesin family (ERM) play essential roles in this process by linking actomyosin forces to the plasma membrane. Yet, the cell-cycle signal that activates ERMs at mitotic entry is unknown. By screening a compound library using newly developed biosensors, we discovered that drugs that disassemble microtubules promote ERM activation. We further demonstrated that disassembly of interphase microtubules at mitotic entry directs ERM activation and metaphase cell rounding through GEF-H1, a Rho-GEF inhibited by microtubule binding, RhoA, and its kinase effector SLK. We finally demonstrated that GEF-H1 and Ect2, another Rho-GEF previously identified to control actomyosin forces, act together to drive activation of ERMs and cell rounding in metaphase. In summary, we report microtubule disassembly as a cell-cycle signal that controls a signaling network ensuring that actomyosin forces are efficiently integrated at the plasma membrane to promote cell rounding at mitotic entry.
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Affiliation(s)
- Kévin Leguay
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Quebec, Canada.,Cellular Mechanisms of Morphogenesis during Mitosis and Cell Motility lab, Université de Montréal, Montréal, Quebec, Canada
| | - Barbara Decelle
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Quebec, Canada.,Cellular Mechanisms of Morphogenesis during Mitosis and Cell Motility lab, Université de Montréal, Montréal, Quebec, Canada
| | - Islam E Elkholi
- Montréal Clinical Research Institute, Montréal, Quebec, Canada.,Cytoskeletal Organization and Cell Migration lab, Université de Montréal, Montréal, Quebec, Canada
| | - Michel Bouvier
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Quebec, Canada.,institution>Molecular Pharmacology Lab, Université de Montréal, Montréal, Quebec, Canada.,Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Quebec, Canada
| | - Jean-François Côté
- Montréal Clinical Research Institute, Montréal, Quebec, Canada.,Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Quebec, Canada.,Department of Medicine, McGill University, Montréal, Quebec, Canada.,Department of Anatomy and Cell Biology, McGill University, Montréal, Quebec, Canada.,Cytoskeletal Organization and Cell Migration lab, Université de Montréal, Montréal, Quebec, Canada
| | - Sébastien Carréno
- Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Quebec, Canada.,Cellular Mechanisms of Morphogenesis during Mitosis and Cell Motility lab, Université de Montréal, Montréal, Quebec, Canada.,Department of Pathology and Cell Biology, Université de Montréal, Montréal, Quebec, Canada
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14
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Chen NP, Aretz J, Fässler R. CDK1-cyclin-B1-induced kindlin degradation drives focal adhesion disassembly at mitotic entry. Nat Cell Biol 2022; 24:723-736. [PMID: 35469017 PMCID: PMC9106588 DOI: 10.1038/s41556-022-00886-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 03/03/2022] [Indexed: 12/25/2022]
Abstract
The disassembly of integrin-containing focal adhesions (FAs) at mitotic entry is essential for cell rounding, mitotic retraction fibre formation, bipolar spindle positioning and chromosome segregation. The mechanism that drives FA disassembly at mitotic entry is unknown. Here, we show that the CDK1–cyclin B1 complex phosphorylates the integrin activator kindlin, which results in the recruitment of the cullin 9–FBXL10 ubiquitin ligase complex that mediates kindlin ubiquitination and degradation. This molecular pathway is essential for FA disassembly and cell rounding, as phospho-inhibitory mutations of the CDK1 motif prevent kindlin degradation, FA disassembly and mitotic cell rounding. Conversely, phospho-mimetic mutations promote kindlin degradation in interphase, accelerate mitotic cell rounding and impair mitotic retraction fibre formation. Despite the opposing effects on kindlin stability, both types of mutations cause severe mitotic spindle defects, apoptosis and aneuploidy. Thus, the exquisite regulation of kindlin levels at mitotic entry is essential for cells to progress accurately through mitosis. Chen et al. report that at mitotic entry, cyclin B1–CDK1 phosphorylates the focal adhesion protein kindlin to induce its proteasomal degradation and promote focal adhesion disassembly and mitotic rounding.
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Affiliation(s)
- Nan-Peng Chen
- Department of Molecular Medicine, Max Planck Institute of Biochemistry, Martinsried, Germany.
| | - Jonas Aretz
- Department of Molecular Medicine, Max Planck Institute of Biochemistry, Martinsried, Germany
| | - Reinhard Fässler
- Department of Molecular Medicine, Max Planck Institute of Biochemistry, Martinsried, Germany.
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15
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Integrin-Mediated Adhesion Promotes Centrosome Separation in Early Mitosis. Cells 2022; 11:cells11081360. [PMID: 35456039 PMCID: PMC9030014 DOI: 10.3390/cells11081360] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 10/29/2021] [Accepted: 04/11/2022] [Indexed: 01/17/2023] Open
Abstract
Integrin-mediated adhesion to the extracellular matrix is a key regulator of the cell cycle, as demonstrated for the passage of the G1/S checkpoint and the completion of cytokinetic abscission. Here, integrin-dependent regulation of the cell cycle in G2 and early M phases was investigated. The progression through the G2 and M phases was monitored by live-cell imaging and immunofluorescence staining in adherent and non-adherent fibroblast cells. Non-adherent cells, as well as adherent cells lacking FAK activity due to suppressed expression or pharmacological inhibition, exhibited a prolonged G2 phase and severely defect centrosome separation, resulting in delayed progress through the early mitotic stages. The activation of the critical mitotic regulator PLK1 and its indirect target Eg5, a kinesin-family motor protein driving the centrosome separation, were reduced in the cells lacking FAK activity. Furthermore, the absence of integrin adhesion or FAK activity destabilized the structural integrity of centrosomes and often caused detachment of pericentriolar material from the centrioles. These data identify a novel adhesion-dependent mechanism by which integrins via FAK and PLK1 contribute to the regulation of the cell cycle in the G2 and early M phases, and to the maintenance of genome integrity.
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16
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Mangon A, Salaün D, Bouali ML, Kuzmić M, Quitard S, Thuault S, Isnardon D, Audebert S, Puech PH, Verdier-Pinard P, Badache A. iASPP contributes to cell cortex rigidity, mitotic cell rounding, and spindle positioning. J Cell Biol 2021; 220:212730. [PMID: 34705028 PMCID: PMC8562848 DOI: 10.1083/jcb.202012002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 08/03/2021] [Accepted: 09/19/2021] [Indexed: 12/27/2022] Open
Abstract
iASPP is a protein mostly known as an inhibitor of p53 pro-apoptotic activity and a predicted regulatory subunit of the PP1 phosphatase, which is often overexpressed in tumors. We report that iASPP associates with the microtubule plus-end binding protein EB1, a central regulator of microtubule dynamics, via an SxIP motif. iASPP silencing or mutation of the SxIP motif led to defective microtubule capture at the cortex of mitotic cells, leading to abnormal positioning of the mitotic spindle. These effects were recapitulated by the knockdown of the membrane-to-cortex linker Myosin-Ic (Myo1c), which we identified as a novel partner of iASPP. Moreover, iASPP or Myo1c knockdown cells failed to round up upon mitosis because of defective cortical stiffness. We propose that by increasing cortical rigidity, iASPP helps cancer cells maintain a spherical geometry suitable for proper mitotic spindle positioning and chromosome partitioning.
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Affiliation(s)
- Aurélie Mangon
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Danièle Salaün
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Mohamed Lala Bouali
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Mira Kuzmić
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Sabine Quitard
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Sylvie Thuault
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Daniel Isnardon
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Stéphane Audebert
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Pierre-Henri Puech
- Laboratoire Adhésion et Inflammation, Institut National de la Santé et de la Recherche Médicale, Centre National de la Recherche Scientifique, Aix Marseille Université, Turing Center for Living Systems, Marseille, France
| | - Pascal Verdier-Pinard
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
| | - Ali Badache
- Centre de Recherche en Cancérologie de Marseille, Institut National de la Santé et de la Recherche Médicale, Institut Paoli-Calmettes, Aix-Marseille Université, Centre National de la Recherche Scientifique, Marseille, France
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17
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Salomaa SI, Miihkinen M, Kremneva E, Paatero I, Lilja J, Jacquemet G, Vuorio J, Antenucci L, Kogan K, Hassani Nia F, Hollos P, Isomursu A, Vattulainen I, Coffey ET, Kreienkamp HJ, Lappalainen P, Ivaska J. SHANK3 conformation regulates direct actin binding and crosstalk with Rap1 signaling. Curr Biol 2021; 31:4956-4970.e9. [PMID: 34610274 DOI: 10.1016/j.cub.2021.09.022] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 07/09/2021] [Accepted: 09/07/2021] [Indexed: 12/15/2022]
Abstract
Actin-rich cellular protrusions direct versatile biological processes from cancer cell invasion to dendritic spine development. The stability, morphology, and specific biological functions of these protrusions are regulated by crosstalk between three main signaling axes: integrins, actin regulators, and small guanosine triphosphatases (GTPases). SHANK3 is a multifunctional scaffold protein, interacting with several actin-binding proteins and a well-established autism risk gene. Recently, SHANK3 was demonstrated to sequester integrin-activating small GTPases Rap1 and R-Ras to inhibit integrin activity via its Shank/ProSAP N-terminal (SPN) domain. Here, we demonstrate that, in addition to scaffolding actin regulators and actin-binding proteins, SHANK3 interacts directly with actin through its SPN domain. Molecular simulations and targeted mutagenesis of the SPN-ankyrin repeat region (ARR) interface reveal that actin binding is inhibited by an intramolecular closed conformation of SHANK3, where the adjacent ARR domain covers the actin-binding interface of the SPN domain. Actin and Rap1 compete with each other for binding to SHANK3, and mutation of SHANK3, resulting in reduced actin binding, augments inhibition of Rap1-mediated integrin activity. This dynamic crosstalk has functional implications for cell morphology and integrin activity in cancer cells. In addition, SHANK3-actin interaction regulates dendritic spine morphology in neurons and autism-linked phenotypes in vivo.
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Affiliation(s)
- Siiri I Salomaa
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland
| | - Mitro Miihkinen
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland
| | - Elena Kremneva
- HiLIFE Institute of Biotechnology, University of Helsinki, Viikinkaari 5B, PO Box 56, 00014 Helsinki, Finland
| | - Ilkka Paatero
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland
| | - Johanna Lilja
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland
| | - Guillaume Jacquemet
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland; Faculty of Science and Engineering, Cell Biology, Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland
| | - Joni Vuorio
- Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2, Helsinki, Finland
| | - Lina Antenucci
- HiLIFE Institute of Biotechnology, University of Helsinki, Viikinkaari 5B, PO Box 56, 00014 Helsinki, Finland
| | - Konstantin Kogan
- HiLIFE Institute of Biotechnology, University of Helsinki, Viikinkaari 5B, PO Box 56, 00014 Helsinki, Finland
| | - Fatemeh Hassani Nia
- Institute for Human Genetics, University Medical Center Hamburg-Eppendorf, Martinistraße 52, 20251 Hamburg, Germany
| | - Patrik Hollos
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland
| | - Aleksi Isomursu
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland
| | - Ilpo Vattulainen
- Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2, Helsinki, Finland
| | - Eleanor T Coffey
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland
| | - Hans-Jürgen Kreienkamp
- Institute for Human Genetics, University Medical Center Hamburg-Eppendorf, Martinistraße 52, 20251 Hamburg, Germany
| | - Pekka Lappalainen
- HiLIFE Institute of Biotechnology, University of Helsinki, Viikinkaari 5B, PO Box 56, 00014 Helsinki, Finland
| | - Johanna Ivaska
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Tykistökatu 6, Turku 20520, Finland; Department of Life Technologies, University of Turku, Tykistökatu 6, Turku 20520, Finland.
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18
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Single-cell adhesion strength and contact density drops in the M phase of cancer cells. Sci Rep 2021; 11:18500. [PMID: 34531409 PMCID: PMC8445979 DOI: 10.1038/s41598-021-97734-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 08/27/2021] [Indexed: 02/08/2023] Open
Abstract
The high throughput, cost effective and sensitive quantification of cell adhesion strength at the single-cell level is still a challenging task. The adhesion force between tissue cells and their environment is crucial in all multicellular organisms. Integrins transmit force between the intracellular cytoskeleton and the extracellular matrix. This force is not only a mechanical interaction but a way of signal transduction as well. For instance, adhesion-dependent cells switch to an apoptotic mode in the lack of adhesion forces. Adhesion of tumor cells is a potential therapeutic target, as it is actively modulated during tissue invasion and cell release to the bloodstream resulting in metastasis. We investigated the integrin-mediated adhesion between cancer cells and their RGD (Arg-Gly-Asp) motif displaying biomimetic substratum using the HeLa cell line transfected by the Fucci fluorescent cell cycle reporter construct. We employed a computer-controlled micropipette and a high spatial resolution label-free resonant waveguide grating-based optical sensor calibrated to adhesion force and energy at the single-cell level. We found that the overall adhesion strength of single cancer cells is approximately constant in all phases except the mitotic (M) phase with a significantly lower adhesion. Single-cell evanescent field based biosensor measurements revealed that at the mitotic phase the cell material mass per unit area inside the cell-substratum contact zone is significantly less, too. Importantly, the weaker mitotic adhesion is not simply a direct consequence of the measured smaller contact area. Our results highlight these differences in the mitotic reticular adhesions and confirm that cell adhesion is a promising target of selective cancer drugs as the vast majority of normal, differentiated tissue cells do not enter the M phase and do not divide.
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19
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Garrido-Casado M, Asensio-Juárez G, Vicente-Manzanares M. Nonmuscle Myosin II Regulation Directs Its Multiple Roles in Cell Migration and Division. Annu Rev Cell Dev Biol 2021; 37:285-310. [PMID: 34314591 DOI: 10.1146/annurev-cellbio-042721-105528] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Nonmuscle myosin II (NMII) is a multimeric protein complex that generates most mechanical force in eukaryotic cells. NMII function is controlled at three main levels. The first level includes events that trigger conformational changes that extend the complex to enable its assembly into filaments. The second level controls the ATPase activity of the complex and its binding to microfilaments in extended NMII filaments. The third level includes events that modulate the stability and contractility of the filaments. They all work in concert to finely control force generation inside cells. NMII is a common endpoint of mechanochemical signaling pathways that control cellular responses to physical and chemical extracellular cues. Specific phosphorylations modulate NMII activation in a context-dependent manner. A few kinases control these phosphorylations in a spatially, temporally, and lineage-restricted fashion, enabling functional adaptability to the cellular microenvironment. Here, we review mechanisms that control NMII activity in the context of cell migration and division. Expected final online publication date for the Annual Review of Cell and Developmental Biology, Volume 37 is October 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Marina Garrido-Casado
- Molecular Mechanisms Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas, University of Salamanca, 37007 Salamanca, Spain;
| | - Gloria Asensio-Juárez
- Molecular Mechanisms Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas, University of Salamanca, 37007 Salamanca, Spain;
| | - Miguel Vicente-Manzanares
- Molecular Mechanisms Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas, University of Salamanca, 37007 Salamanca, Spain;
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20
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Gough RE, Jones MC, Zacharchenko T, Le S, Yu M, Jacquemet G, Muench SP, Yan J, Humphries JD, Jørgensen C, Humphries MJ, Goult BT. Talin mechanosensitivity is modulated by a direct interaction with cyclin-dependent kinase-1. J Biol Chem 2021; 297:100837. [PMID: 34118235 PMCID: PMC8260872 DOI: 10.1016/j.jbc.2021.100837] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 05/20/2021] [Accepted: 05/25/2021] [Indexed: 02/06/2023] Open
Abstract
Talin (TLN1) is a mechanosensitive component of adhesion complexes that directly couples integrins to the actin cytoskeleton. In response to force, talin undergoes switch-like behavior of its multiple rod domains that modulate interactions with its binding partners. Cyclin-dependent kinase-1 (CDK1) is a key regulator of the cell cycle, exerting its effects through synchronized phosphorylation of a large number of protein targets. CDK1 activity maintains adhesion during interphase, and its inhibition is a prerequisite for the tightly choreographed changes in cell shape and adhesion that are required for successful mitosis. Using a combination of biochemical, structural, and cell biological approaches, we demonstrate a direct interaction between talin and CDK1 that occurs at sites of integrin-mediated adhesion. Mutagenesis demonstrated that CDK1 contains a functional talin-binding LD motif, and the binding site within talin was pinpointed to helical bundle R8. Talin also contains a consensus CDK1 phosphorylation motif centered on S1589, a site shown to be phosphorylated by CDK1 in vitro. A phosphomimetic mutant of this site within talin lowered the binding affinity of the cytoskeletal adaptor KANK and weakened the response of this region to force as measured by single molecule stretching, potentially altering downstream mechanotransduction pathways. The direct binding of the master cell cycle regulator CDK1 to the primary integrin effector talin represents a coupling of cell proliferation and cell adhesion machineries and thereby indicates a mechanism by which the microenvironment can control cell division in multicellular organisms.
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Affiliation(s)
| | - Matthew C Jones
- Faculty of Biology, Medicine & Health, Wellcome Centre for Cell-Matrix Research, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Thomas Zacharchenko
- Faculty of Biology, Medicine & Health, Wellcome Centre for Cell-Matrix Research, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Shimin Le
- Mechanobiology Institute, National University of Singapore, Singapore
| | - Miao Yu
- Mechanobiology Institute, National University of Singapore, Singapore
| | - Guillaume Jacquemet
- Faculty of Science and Engineering, Cell Biology Department, Åbo Akademi University, Turku, Finland; Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, Finland
| | - Ste P Muench
- School of Biomedical Sciences, Astbury Centre for Structural Biology, University of Leeds, Leeds, UK
| | - Jie Yan
- Mechanobiology Institute, National University of Singapore, Singapore; Department of Physics, National University of Singapore, Singapore
| | - Jonathan D Humphries
- Faculty of Biology, Medicine & Health, Wellcome Centre for Cell-Matrix Research, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Claus Jørgensen
- Cancer Research UK Manchester Institute, The University of Manchester, Manchester, UK
| | - Martin J Humphries
- Faculty of Biology, Medicine & Health, Wellcome Centre for Cell-Matrix Research, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK.
| | - Benjamin T Goult
- School of Biosciences, University of Kent, Canterbury, Kent, UK.
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21
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Mishra YG, Manavathi B. Focal adhesion dynamics in cellular function and disease. Cell Signal 2021; 85:110046. [PMID: 34004332 DOI: 10.1016/j.cellsig.2021.110046] [Citation(s) in RCA: 65] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 05/13/2021] [Indexed: 02/06/2023]
Abstract
Acting as a bridge between the cytoskeleton of the cell and the extra cellular matrix (ECM), the cell-ECM adhesions with integrins at their core, play a major role in cell signalling to direct mechanotransduction, cell migration, cell cycle progression, proliferation, differentiation, growth and repair. Biochemically, these adhesions are composed of diverse, yet an organised group of structural proteins, receptors, adaptors, various enzymes including protein kinases, phosphatases, GTPases, proteases, etc. as well as scaffolding molecules. The major integrin adhesion complexes (IACs) characterised are focal adhesions (FAs), invadosomes (podosomes and invadopodia), hemidesmosomes (HDs) and reticular adhesions (RAs). The varied composition and regulation of the IACs and their signalling, apart from being an integral part of normal cell survival, has been shown to be of paramount importance in various developmental and pathological processes. This review per-illustrates the recent advancements in the research of IACs, their crucial roles in normal as well as diseased states. We have also touched on few of the various methods that have been developed over the years to visualise IACs, measure the forces they exert and study their signalling and molecular composition. Having such pertinent roles in the context of various pathologies, these IACs need to be understood and studied to develop therapeutical targets. We have given an update to the studies done in recent years and described various techniques which have been applied to study these structures, thereby, providing context in furthering research with respect to IAC targeted therapeutics.
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Affiliation(s)
- Yasaswi Gayatri Mishra
- Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad 500046, India
| | - Bramanandam Manavathi
- Department of Biochemistry, School of Life Sciences, University of Hyderabad, Hyderabad 500046, India.
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22
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Monster JL, Donker L, Vliem MJ, Win Z, Matthews HK, Cheah JS, Yamada S, de Rooij J, Baum B, Gloerich M. An asymmetric junctional mechanoresponse coordinates mitotic rounding with epithelial integrity. J Cell Biol 2021; 220:e202001042. [PMID: 33688935 PMCID: PMC7953256 DOI: 10.1083/jcb.202001042] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 12/23/2020] [Accepted: 02/11/2021] [Indexed: 12/14/2022] Open
Abstract
Epithelia are continuously self-renewed, but how epithelial integrity is maintained during the morphological changes that cells undergo in mitosis is not well understood. Here, we show that as epithelial cells round up when they enter mitosis, they exert tensile forces on neighboring cells. We find that mitotic cell-cell junctions withstand these tensile forces through the mechanosensitive recruitment of the actin-binding protein vinculin to cadherin-based adhesions. Surprisingly, vinculin that is recruited to mitotic junctions originates selectively from the neighbors of mitotic cells, resulting in an asymmetric composition of cadherin junctions. Inhibition of junctional vinculin recruitment in neighbors of mitotic cells results in junctional breakage and weakened epithelial barrier. Conversely, the absence of vinculin from the cadherin complex in mitotic cells is necessary to successfully undergo mitotic rounding. Our data thus identify an asymmetric mechanoresponse at cadherin adhesions during mitosis, which is essential to maintain epithelial integrity while at the same time enable the shape changes of mitotic cells.
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Affiliation(s)
- Jooske L. Monster
- Molecular Cancer Research, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Lisa Donker
- Molecular Cancer Research, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Marjolein J. Vliem
- Molecular Cancer Research, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Zaw Win
- Medical Research Council Laboratory for Molecular Cell Biology, University College London, London, UK
| | - Helen K. Matthews
- Medical Research Council Laboratory for Molecular Cell Biology, University College London, London, UK
| | - Joleen S. Cheah
- Department of Biomedical Engineering, University of California, Davis, Davis, CA
| | - Soichiro Yamada
- Department of Biomedical Engineering, University of California, Davis, Davis, CA
| | - Johan de Rooij
- Molecular Cancer Research, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Buzz Baum
- Medical Research Council Laboratory for Molecular Cell Biology, University College London, London, UK
| | - Martijn Gloerich
- Molecular Cancer Research, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht, The Netherlands
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23
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Glucagon transiently stimulates mTORC1 by activation of an EPAC/Rap1 signaling axis. Cell Signal 2021; 84:110010. [PMID: 33872697 PMCID: PMC8169602 DOI: 10.1016/j.cellsig.2021.110010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 04/12/2021] [Accepted: 04/13/2021] [Indexed: 11/22/2022]
Abstract
Activation of the protein kinase mechanistic target of rapamycin (mTOR) in both complexes 1 and 2 (mTORC1/2) in the liver is repressed during fasting and rapidly stimulated in response to a meal. The effect of feeding on hepatic mTORC1/2 is attributed to an increase in plasma levels of nutrients, such as amino acids, and insulin. By contrast, fasting is associated with elevated plasma levels of glucagon, which is conventionally viewed as having a counter-regulatory role to insulin. More recently an expanded role for glucagon action in post-prandial metabolism has been demonstrated. Herein we investigated the impact of insulin and glucagon on mTORC1/2 activation. In H4IIE and HepG2 cultures, insulin enhanced phosphorylation of the mTORC1 substrates S6K1 and 4E-BP1. Surprisingly, the effect of glucagon on mTORC1 was biphasic, wherein there was an acute increase in phosphorylation of S6K1 and 4E-BP1 over the first hour of exposure, followed by latent suppression. The transient stimulatory effect of glucagon on mTORC1 was not additive with insulin, suggesting convergent signaling. Glucagon enhanced cAMP levels and mTORC1 stimulation required activation of the glucagon receptor, PI3K/Akt, and exchange protein activated by cAMP (EPAC). EPAC acts as the guanine nucleotide exchange factor for the small GTPase Rap1. Rap1 expression enhanced S6K1 phosphorylation and glucagon addition to culture medium promoted Rap1-GTP loading. Signaling through mTORC1 acts to regulate protein synthesis and we found that glucagon promoted an EPAC-dependent increase in protein synthesis. Overall, the findings support that glucagon elicits acute activation of mTORC1/2 by an EPAC-dependent increase in Rap1-GTP.
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24
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Dantas M, Lima JT, Ferreira JG. Nucleus-Cytoskeleton Crosstalk During Mitotic Entry. Front Cell Dev Biol 2021; 9:649899. [PMID: 33816500 PMCID: PMC8014196 DOI: 10.3389/fcell.2021.649899] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 02/26/2021] [Indexed: 12/30/2022] Open
Abstract
In preparation for mitosis, cells undergo extensive reorganization of the cytoskeleton and nucleus, so that chromosomes can be efficiently segregated into two daughter cells. Coordination of these cytoskeletal and nuclear events occurs through biochemical regulatory pathways, orchestrated by Cyclin-CDK activity. However, recent studies provide evidence that physical forces are also involved in the early steps of spindle assembly. Here, we will review how the crosstalk of physical forces and biochemical signals coordinates nuclear and cytoplasmic events during the G2-M transition, to ensure efficient spindle assembly and faithful chromosome segregation.
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Affiliation(s)
- Margarida Dantas
- Instituto de Investigação e Inovação em Saúde - i3S, University of Porto, Porto, Portugal.,BiotechHealth Ph.D. Programme, University of Porto, Porto, Portugal.,Instituto de Ciências Biomédicas Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Joana T Lima
- Instituto de Investigação e Inovação em Saúde - i3S, University of Porto, Porto, Portugal.,Departamento de Biomedicina, Faculdade de Medicina, University of Porto, Porto, Portugal
| | - Jorge G Ferreira
- Instituto de Investigação e Inovação em Saúde - i3S, University of Porto, Porto, Portugal.,Departamento de Biomedicina, Faculdade de Medicina, University of Porto, Porto, Portugal
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25
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Nunes V, Ferreira JG. From the cytoskeleton to the nucleus: An integrated view on early spindle assembly. Semin Cell Dev Biol 2021; 117:42-51. [PMID: 33726956 DOI: 10.1016/j.semcdb.2021.03.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 03/09/2021] [Accepted: 03/10/2021] [Indexed: 12/01/2022]
Abstract
Accurate chromosome segregation requires a complete restructuring of cellular organization. Microtubules remodel to assemble a mitotic spindle and the actin cytoskeleton rearranges to form a stiff actomyosin cortex. These cytoplasmic events must be spatially and temporally coordinated with mitotic chromosome condensation and nuclear envelope permeabilization, in order to ensure mitotic timing and fidelity. Here, we discuss the main cytoskeletal and nuclear events that occur during mitotic entry in proliferating animal cells, focusing on their coordinated contribution for early mitotic spindle assembly. We will also explore recent progress in understanding their regulatory biochemical and mechanical pathways.
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Affiliation(s)
- Vanessa Nunes
- Instituto de Investigação e Inovação em Saúde - i3S, University of Porto, Porto, Portugal; BiotechHealth PhD Programe, Instituto de Ciências Biomédicas Abel Salazar (ICBAS), University of Porto, Porto, Portugal
| | - Jorge G Ferreira
- Instituto de Investigação e Inovação em Saúde - i3S, University of Porto, Porto, Portugal; Departamento de Biomedicina, Faculdade de Medicina, University of Porto, Porto, Portugal.
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26
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Cdk1 phosphorylation negatively regulates the activity of Net1 towards RhoA during mitosis. Cell Signal 2021; 80:109926. [PMID: 33465404 DOI: 10.1016/j.cellsig.2021.109926] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 01/06/2021] [Accepted: 01/11/2021] [Indexed: 11/24/2022]
Abstract
The Neuroepithelial transforming gene 1 (Net1) is a RhoA subfamily guanine nucleotide exchange factor that is overexpressed in a number of cancers and contributes to cancer cell motility and proliferation. Net1 also plays a Rho GTPase independent role in mitotic progression, where it promotes centrosomal activation of Aurora A and Pak2, and aids in chromosome alignment during prometaphase. To understand regulatory mechanisms controlling the mitotic function of Net1, we examined whether it was phosphorylated by the mitotic kinase Cdk1. We observed that Cdk1 phosphorylated Net1 on multiple sites in its N-terminal regulatory domain and C-terminus in vitro. By raising phospho-specific antibodies to two of these sites, we also demonstrated that both endogenous and transfected Net1 were phosphorylated by Cdk1 in cells. Substitution of the major Cdk1 phosphorylation sites with aliphatic or acidic residues inhibited the interaction of Net1 with RhoA, and treatment of metaphase cells with a Cdk1 inhibitor increased Net1 activity. Cdk1 inhibition also increased Net1 localization to the plasma membrane and stimulated cortical F-actin accumulation. Moreover, Net1 overexpression caused spindle polarity defects that were reduced in frequency by acidic substitution of the major Cdk1 phosphorylation sites. These data indicate that Cdk1 phosphorylates Net1 during mitosis and suggest that this negatively regulates its ability to signal to RhoA and alter actin cytoskeletal organization.
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27
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Castro D, Nunes V, Lima JT, Ferreira JG, Aguiar P. Trackosome: a computational toolbox to study the spatiotemporal dynamics of centrosomes, nuclear envelope and cellular membrane. J Cell Sci 2020; 133:jcs.252254. [PMID: 33199521 DOI: 10.1242/jcs.252254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Accepted: 11/02/2020] [Indexed: 11/20/2022] Open
Abstract
During the initial stages of mitosis, multiple mechanisms drive centrosome separation and positioning. How they are coordinated to promote centrosome migration to opposite sides of the nucleus remains unclear. Here, we present Trackosome, an open-source image analysis software for tracking centrosomes and reconstructing nuclear and cellular membranes, based on volumetric live-imaging data. The toolbox runs in MATLAB and provides a graphical user interface for easy access to the tracking and analysis algorithms. It provides detailed quantification of the spatiotemporal relationships between centrosomes, nuclear envelope and cellular membrane, and can also be used to measure the dynamic fluctuations of the nuclear envelope. These fluctuations are important because they are related to the mechanical forces exerted on the nucleus by its adjacent cytoskeletal structures. Unlike previous algorithms based on circular or elliptical approximations, Trackosome measures membrane movement in a model-free condition, making it viable for irregularly shaped nuclei. Using Trackosome, we demonstrate significant correlations between the movements of the centrosomes, and identify specific oscillation modes of the nuclear envelope. Overall, Trackosome is a powerful tool that can be used to help unravel new elements in the spatiotemporal dynamics of subcellular structures.
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Affiliation(s)
- Domingos Castro
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal
| | - Vanessa Nunes
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal
| | - Joana T Lima
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal
| | - Jorge G Ferreira
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal .,Departamento de Biomedicina, Faculdade de Medicina, Universidade do Porto, 4200-450 Porto, Portugal
| | - Paulo Aguiar
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal
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28
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Kaibori Y, Katayama K, Tanaka Y, Ikeuchi M, Ogawa M, Ikeda Y, Yuki R, Saito Y, Nakayama Y. Kinase activity-independent role of EphA2 in the regulation of M-phase progression. Exp Cell Res 2020; 395:112207. [PMID: 32750331 DOI: 10.1016/j.yexcr.2020.112207] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 07/17/2020] [Accepted: 07/26/2020] [Indexed: 02/05/2023]
Abstract
Cell division is a tightly regulated, essential process for cell proliferation. Very recently, we reported that EphA2 is phosphorylated at Ser897, via the Cdk1/MEK/ERK/RSK pathway, during M phase and contributes to proper M-phase progression by maintaining cortical rigidity via the EphA2pSer897/ephexin4/RhoG pathway. Here, we show that EphA2 kinase activity is dispensable for M-phase progression. Although EphA2 knockdown delayed this progression, the delay was rescued by an EphA2 mutant expression with an Asp739 to Asn substitution, as well as by wild-type EphA2. Western blotting analysis confirmed that the Asp739Asn mutant lost its EphA2 kinase activity. Like wild-type EphA2, the Asp739Asn mutant was localized to the plasma membrane irrespective of cell cycle. While RhoG localization to the plasma membrane was decreased in EphA2 knockdown cells, it was rescued by re-expression of wild-type EphA2 but not via the mutant containing the Ser897 to Ala substitution. This confirmed our recent report that phosphorylation at Ser897 is responsible for RhoG localization to the plasma membrane. In agreement with the M-phase progression's rescue effect, the Asp739Asn mutant rescued RhoG localization in EphA2 knockdown cells. These results suggest that EphA2 regulates M-phase progression in a manner independent of its kinase activity.
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Affiliation(s)
- Yuichiro Kaibori
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, 607-8414, Japan
| | - Kiriko Katayama
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, 607-8414, Japan
| | - Yuka Tanaka
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, 607-8414, Japan
| | - Masayoshi Ikeuchi
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, 607-8414, Japan
| | - Mika Ogawa
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, 607-8414, Japan
| | - Yuki Ikeda
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, 607-8414, Japan
| | - Ryuzaburo Yuki
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, 607-8414, Japan
| | - Youhei Saito
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, 607-8414, Japan
| | - Yuji Nakayama
- Department of Biochemistry & Molecular Biology, Kyoto Pharmaceutical University, Kyoto, 607-8414, Japan.
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29
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Dimitracopoulos A, Srivastava P, Chaigne A, Win Z, Shlomovitz R, Lancaster OM, Le Berre M, Piel M, Franze K, Salbreux G, Baum B. Mechanochemical Crosstalk Produces Cell-Intrinsic Patterning of the Cortex to Orient the Mitotic Spindle. Curr Biol 2020; 30:3687-3696.e4. [PMID: 32735816 PMCID: PMC7521479 DOI: 10.1016/j.cub.2020.06.098] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 05/14/2020] [Accepted: 06/29/2020] [Indexed: 12/27/2022]
Abstract
Proliferating animal cells are able to orient their mitotic spindles along their interphase cell axis, setting up the axis of cell division, despite rounding up as they enter mitosis. This has previously been attributed to molecular memory and, more specifically, to the maintenance of adhesions and retraction fibers in mitosis [1-6], which are thought to act as local cues that pattern cortical Gαi, LGN, and nuclear mitotic apparatus protein (NuMA) [3, 7-18]. This cortical machinery then recruits and activates Dynein motors, which pull on astral microtubules to position the mitotic spindle. Here, we reveal a dynamic two-way crosstalk between the spindle and cortical motor complexes that depends on a Ran-guanosine triphosphate (GTP) signal [12], which is sufficient to drive continuous monopolar spindle motion independently of adhesive cues in flattened human cells in culture. Building on previous work [1, 12, 19-23], we implemented a physical model of the system that recapitulates the observed spindle-cortex interactions. Strikingly, when this model was used to study spindle dynamics in cells entering mitosis, the chromatin-based signal was found to preferentially clear force generators from the short cell axis, so that cortical motors pulling on astral microtubules align bipolar spindles with the interphase long cell axis, without requiring a fixed cue or a physical memory of interphase shape. Thus, our analysis shows that the ability of chromatin to pattern the cortex during the process of mitotic rounding is sufficient to translate interphase shape into a cortical pattern that can be read by the spindle, which then guides the axis of cell division.
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Affiliation(s)
- Andrea Dimitracopoulos
- Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK; MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK.
| | | | - Agathe Chaigne
- MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK
| | - Zaw Win
- MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK
| | - Roie Shlomovitz
- MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK; Department of Chemical Physics, The Weizmann Institute of Science, PO Box 26, Rehovot 76100, Israel
| | - Oscar M Lancaster
- MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK
| | - Maël Le Berre
- Institut Curie, PSL Research University, CNRS, UMR 144, Paris 75005, France
| | - Matthieu Piel
- Institut Curie, PSL Research University, CNRS, UMR 144, Paris 75005, France
| | - Kristian Franze
- Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK
| | - Guillaume Salbreux
- The Francis Crick Institute, 1 Midland Road, London NW1 1AT, UK; Institute for the Physics of Living Systems, University College London, Gower Street, London WC1E 6BT, UK.
| | - Buzz Baum
- MRC Laboratory for Molecular Cell Biology, University College London, Gower Street, London WC1E 6BT, UK; Institute for the Physics of Living Systems, University College London, Gower Street, London WC1E 6BT, UK.
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30
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Taubenberger AV, Baum B, Matthews HK. The Mechanics of Mitotic Cell Rounding. Front Cell Dev Biol 2020; 8:687. [PMID: 32850812 PMCID: PMC7423972 DOI: 10.3389/fcell.2020.00687] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 07/06/2020] [Indexed: 12/21/2022] Open
Abstract
When animal cells enter mitosis, they round up to become spherical. This shape change is accompanied by changes in mechanical properties. Multiple studies using different measurement methods have revealed that cell surface tension, intracellular pressure and cortical stiffness increase upon entry into mitosis. These cell-scale, biophysical changes are driven by alterations in the composition and architecture of the contractile acto-myosin cortex together with osmotic swelling and enable a mitotic cell to exert force against the environment. When the ability of cells to round is limited, for example by physical confinement, cells suffer severe defects in spindle assembly and cell division. The requirement to push against the environment to create space for spindle formation is especially important for cells dividing in tissues. Here we summarize the evidence and the tools used to show that cells exert rounding forces in mitosis in vitro and in vivo, review the molecular basis for this force generation and discuss its function for ensuring successful cell division in single cells and for cells dividing in normal or diseased tissues.
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Affiliation(s)
- Anna V. Taubenberger
- Biotechnology Center, Center for Molecular and Cellular Bioengineering, Technische Universität Dresden, Dresden, Germany
| | - Buzz Baum
- MRC Laboratory for Molecular Cell Biology, University College London, London, United Kingdom
| | - Helen K. Matthews
- MRC Laboratory for Molecular Cell Biology, University College London, London, United Kingdom
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31
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Nunes V, Dantas M, Castro D, Vitiello E, Wang I, Carpi N, Balland M, Piel M, Aguiar P, Maiato H, Ferreira JG. Centrosome-nuclear axis repositioning drives the assembly of a bipolar spindle scaffold to ensure mitotic fidelity. Mol Biol Cell 2020; 31:1675-1690. [PMID: 32348198 PMCID: PMC7521851 DOI: 10.1091/mbc.e20-01-0047] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
During the initial stages of cell division, the cytoskeleton is extensively reorganized so that a bipolar mitotic spindle can be correctly assembled. This process occurs through the action of molecular motors, cytoskeletal networks, and the nucleus. How the combined activity of these different components is spatiotemporally regulated to ensure efficient spindle assembly remains unclear. To investigate how cell shape, cytoskeletal organization, and molecular motors cross-talk to regulate initial spindle assembly, we use a combination of micropatterning with high-resolution imaging and 3D cellular reconstruction. We show that during prophase, centrosomes and nucleus reorient so that centrosomes are positioned on the shortest nuclear axis at nuclear envelope (NE) breakdown. We also find that this orientation depends on a combination of centrosome movement controlled by Arp2/3-mediated regulation of microtubule dynamics and Dynein-generated forces on the NE that regulate nuclear reorientation. Finally, we observe this centrosome configuration favors the establishment of an initial bipolar spindle scaffold, facilitating chromosome capture and accurate segregation, without compromising division plane orientation.
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Affiliation(s)
- Vanessa Nunes
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal.,Instituto de Biologia Celular e Molecular (IBMC), 4200-135 Porto, Portugal.,BiotechHealth PhD program, Instituto de Ciências Biomédicas (ICBAS), 4050-313 Porto, Portugal
| | - Margarida Dantas
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal.,Instituto de Biologia Celular e Molecular (IBMC), 4200-135 Porto, Portugal.,BiotechHealth PhD program, Instituto de Ciências Biomédicas (ICBAS), 4050-313 Porto, Portugal
| | - Domingos Castro
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal.,Instituto Nacional de Engenharia Biomédica (INEB), 4200-135 Porto, Portugal
| | - Elisa Vitiello
- Laboratoire Interdisciplinaire de Physique, Université Joseph Fourier (Grenoble 1) 38058, France
| | - Irène Wang
- Laboratoire Interdisciplinaire de Physique, Université Joseph Fourier (Grenoble 1) 38058, France
| | - Nicolas Carpi
- Institut Curie, PSL Research University, CNRS, UMR 144, F-75005 Paris, France.,Institut Pierre-Gilles de Gennes, PSL Research University, F-75005 Paris, France
| | - Martial Balland
- Laboratoire Interdisciplinaire de Physique, Université Joseph Fourier (Grenoble 1) 38058, France
| | - Matthieu Piel
- Institut Curie, PSL Research University, CNRS, UMR 144, F-75005 Paris, France.,Institut Pierre-Gilles de Gennes, PSL Research University, F-75005 Paris, France
| | - Paulo Aguiar
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal.,Instituto Nacional de Engenharia Biomédica (INEB), 4200-135 Porto, Portugal
| | - Helder Maiato
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal.,Instituto de Biologia Celular e Molecular (IBMC), 4200-135 Porto, Portugal.,Departamento de Biomedicina, Faculdade de Medicina do Porto, 4200-450 Porto, Portugal
| | - Jorge G Ferreira
- Instituto de Investigação e Inovação em Saúde (i3S), 4200-135 Porto, Portugal.,Instituto de Biologia Celular e Molecular (IBMC), 4200-135 Porto, Portugal.,Departamento de Biomedicina, Faculdade de Medicina do Porto, 4200-450 Porto, Portugal
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32
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Wu H, Chen L, Zhu F, Han X, Sun L, Chen K. The Cytotoxicity Effect of Resveratrol: Cell Cycle Arrest and Induced Apoptosis of Breast Cancer 4T1 Cells. Toxins (Basel) 2019; 11:toxins11120731. [PMID: 31847250 PMCID: PMC6950385 DOI: 10.3390/toxins11120731] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 12/09/2019] [Accepted: 12/10/2019] [Indexed: 12/15/2022] Open
Abstract
Resveratrol, a natural polyterpenoid, can scavenge reactive oxygen species in vivo to carry out the functions of antioxidation and antiaging. Resveratrol’s anti-cancer capability has attracted widespread attention, but its molecular mechanism has not been systematically explained. In this study, by comparing the activity of normal cell lines and cancer cell lines after treating with resveratrol, it was found that resveratrol has more significant cytotoxicity in cancer cell lines. Resveratrol could play a toxic role through inducing apoptosis of the cancer cell in a time- and concentration-dependent manner. A total of 330 significantly differential genes were identified through large-scale transcriptome sequencing, among which 103 genes were upregulated and 227 genes were downregulated. Transcriptome and qRT-PCR data proved that a large number of genes related to cell cycle were differentially expressed after the treatment of resveratrol. The changes of cell cycle phases at different time points after treating with resveratrol were further detected, and it was found that the cells were arrested in the S phase because of the percentage of cells in S phase increased and cells in G1/G0 phase decreased. In conclusion, resveratrol can inhibit the proliferation of 4T1 cancer cells by inhibiting cell cycle and inducing apoptosis.
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Affiliation(s)
| | | | | | | | | | - Keping Chen
- Correspondence: ; Tel./Fax: +86-511-88791923
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33
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Uroz M, Garcia-Puig A, Tekeli I, Elosegui-Artola A, Abenza JF, Marín-Llauradó A, Pujals S, Conte V, Albertazzi L, Roca-Cusachs P, Raya Á, Trepat X. Traction forces at the cytokinetic ring regulate cell division and polyploidy in the migrating zebrafish epicardium. NATURE MATERIALS 2019; 18:1015-1023. [PMID: 31160803 DOI: 10.1038/s41563-019-0381-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 04/18/2019] [Indexed: 06/09/2023]
Abstract
Epithelial repair and regeneration are driven by collective cell migration and division. Both cellular functions involve tightly controlled mechanical events, but how physical forces regulate cell division in migrating epithelia is largely unknown. Here we show that cells dividing in the migrating zebrafish epicardium exert large cell-extracellular matrix (ECM) forces during cytokinesis. These forces point towards the division axis and are exerted through focal adhesions that connect the cytokinetic ring to the underlying ECM. When subjected to high loading rates, these cytokinetic focal adhesions prevent closure of the contractile ring, leading to multi-nucleation through cytokinetic failure. By combining a clutch model with experiments on substrates of different rigidity, ECM composition and ligand density, we show that failed cytokinesis is triggered by adhesion reinforcement downstream of increased myosin density. The mechanical interaction between the cytokinetic ring and the ECM thus provides a mechanism for the regulation of cell division and polyploidy that may have implications in regeneration and cancer.
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Affiliation(s)
- Marina Uroz
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona, Spain
| | - Anna Garcia-Puig
- Center of Regenerative Medicine in Barcelona (CMRB), Barcelona, Spain
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - Isil Tekeli
- Center of Regenerative Medicine in Barcelona (CMRB), Barcelona, Spain
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - Alberto Elosegui-Artola
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona, Spain
| | - Juan F Abenza
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona, Spain
| | - Ariadna Marín-Llauradó
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona, Spain
| | - Silvia Pujals
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona, Spain
| | - Vito Conte
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona, Spain
- Department of Biomedical Engineering and the Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Lorenzo Albertazzi
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona, Spain
- Department of Biomedical Engineering and the Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, the Netherlands
| | - Pere Roca-Cusachs
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona, Spain
- University of Barcelona, Barcelona, Spain
| | - Ángel Raya
- Center of Regenerative Medicine in Barcelona (CMRB), Barcelona, Spain
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
| | - Xavier Trepat
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona, Spain.
- Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain.
- University of Barcelona, Barcelona, Spain.
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain.
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34
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Jones MC, Zha J, Humphries MJ. Connections between the cell cycle, cell adhesion and the cytoskeleton. Philos Trans R Soc Lond B Biol Sci 2019; 374:20180227. [PMID: 31431178 PMCID: PMC6627016 DOI: 10.1098/rstb.2018.0227] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/26/2018] [Indexed: 12/18/2022] Open
Abstract
Cell division, the purpose of which is to enable cell replication, and in particular to distribute complete, accurate copies of genetic material to daughter cells, is essential for the propagation of life. At a morphological level, division not only necessitates duplication of cellular structures, but it also relies on polar segregation of this material followed by physical scission of the parent cell. For these fundamental changes in cell shape and positioning to be achieved, mechanisms are required to link the cell cycle to the modulation of cytoarchitecture. Outside of mitosis, the three main cytoskeletal networks not only endow cells with a physical cytoplasmic skeleton, but they also provide a mechanism for spatio-temporal sensing via integrin-associated adhesion complexes and site-directed delivery of cargoes. During mitosis, some interphase functions are retained, but the architecture of the cytoskeleton changes dramatically, and there is a need to generate a mitotic spindle for chromosome segregation. An economical solution is to re-use existing cytoskeletal molecules: transcellular actin stress fibres remodel to create a rigid cortex and a cytokinetic furrow, while unipolar radial microtubules become the primary components of the bipolar spindle. This remodelling implies the existence of specific mechanisms that link the cell-cycle machinery to the control of adhesion and the cytoskeleton. In this article, we review the intimate three-way connection between microenvironmental sensing, adhesion signalling and cell proliferation, particularly in the contexts of normal growth control and aberrant tumour progression. As the morphological changes that occur during mitosis are ancient, the mechanisms linking the cell cycle to the cytoskeleton/adhesion signalling network are likely to be primordial in nature and we discuss recent advances that have elucidated elements of this link. A particular focus is the connection between CDK1 and cell adhesion. This article is part of a discussion meeting issue 'Forces in cancer: interdisciplinary approaches in tumour mechanobiology'.
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Affiliation(s)
| | | | - Martin J. Humphries
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester M13 9PT, UK
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35
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Zhao XF, Kohen R, Parent R, Duan Y, Fisher GL, Korn MJ, Ji L, Wan G, Jin J, Püschel AW, Dolan DF, Parent JM, Corfas G, Murphy GG, Giger RJ. PlexinA2 Forward Signaling through Rap1 GTPases Regulates Dentate Gyrus Development and Schizophrenia-like Behaviors. Cell Rep 2019; 22:456-470. [PMID: 29320740 PMCID: PMC5788190 DOI: 10.1016/j.celrep.2017.12.044] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 10/30/2017] [Accepted: 12/12/2017] [Indexed: 01/20/2023] Open
Abstract
Dentate gyrus (DG) development requires specification of granule cell (GC) progenitors in the hippocampal neuroepithelium, as well as their proliferation and migration into the primordial DG. We identify the Plexin family members Plxna2 and Plxna4 as important regulators of DG development. Distribution of immature GCs is regulated by Sema5A signaling through PlxnA2 and requires a functional PlxnA2 GTPase-activating protein (GAP) domain and Rap1 small GTPases. In adult Plxna2−/− but not Plxna2-GAP-deficient mice, the dentate GC layer is severely malformed, neurogenesis is compromised, and mossy fibers form aberrant synaptic boutons within CA3. Behavioral studies with Plxna2−/− mice revealed deficits in associative learning, sociability, and sensorimotor gating—traits commonly observed in neuropsychiatric disorder. Remarkably, while morphological defects are minimal in Plxna2-GAP-deficient brains, defects in fear memory and sensorimotor gating persist. Since allelic variants of human PLXNA2 and RAP1 associate with schizophrenia, our studies identify a biochemical pathway important for brain development and mental health.
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Affiliation(s)
- Xiao-Feng Zhao
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Rafi Kohen
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA; Neuroscience Graduate Program, University of Michigan, Ann Arbor, MI 48109, USA
| | - Rachel Parent
- Molecular & Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Yuntao Duan
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Grace L Fisher
- Molecular & Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Matthew J Korn
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Lingchao Ji
- Kresge Hearing Research Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Guoqiang Wan
- Kresge Hearing Research Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jing Jin
- Institut für Molekulare Zellbiologie, Westfälische Wilhelms-Universität, 48149 Münster, Germany; Cells-in-Motion Cluster of Excellence, University of Münster, 48149 Münster, Germany
| | - Andreas W Püschel
- Institut für Molekulare Zellbiologie, Westfälische Wilhelms-Universität, 48149 Münster, Germany; Cells-in-Motion Cluster of Excellence, University of Münster, 48149 Münster, Germany
| | - David F Dolan
- Kresge Hearing Research Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jack M Parent
- Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA; VA Ann Arbor Healthcare System, Ann Arbor, MI 48105, USA; Neuroscience Graduate Program, University of Michigan, Ann Arbor, MI 48109, USA
| | - Gabriel Corfas
- Kresge Hearing Research Institute, University of Michigan, Ann Arbor, MI 48109, USA; Neuroscience Graduate Program, University of Michigan, Ann Arbor, MI 48109, USA
| | - Geoffrey G Murphy
- Molecular & Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI 48109, USA; Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA; Neuroscience Graduate Program, University of Michigan, Ann Arbor, MI 48109, USA
| | - Roman J Giger
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA; Department of Neurology, University of Michigan, Ann Arbor, MI 48109, USA; Neuroscience Graduate Program, University of Michigan, Ann Arbor, MI 48109, USA.
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36
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Li Y, Burridge K. Cell-Cycle-Dependent Regulation of Cell Adhesions: Adhering to the Schedule: Three papers reveal unexpected properties of adhesion structures as cells progress through the cell cycle. Bioessays 2018; 41:e1800165. [PMID: 30485463 DOI: 10.1002/bies.201800165] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/30/2018] [Indexed: 12/16/2022]
Abstract
Focal adhesions disassemble during mitosis, but surprisingly little is known about how these structures respond to other phases of the cell cycle. Three recent papers reveal unexpected results as they examine adhesions through the cell cycle. A biphasic response is detected where focal adhesions grow during S phase before disassembly begins early in G2. In M phase, activated integrins at the tips of retraction fibers anchor mitotic cells, but these adhesions lack the defining components of focal adhesions, such as talin, paxillin, and zyxin. Re-examining cell-matrix adhesion reveals reticular adhesions, a new class of adhesion. These αVβ5 integrin-mediated adhesions also lack conventional focal adhesion components and anchor mitotic cells to the extracellular matrix. As reviewed here, these studies present insight into how adhesion complexes vary through the cell cycle, and how unconventional adhesions maintain attachment during mitosis while providing spatial memory to guide daughter cell re-spreading after cell division.
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Affiliation(s)
- Yitong Li
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Keith Burridge
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, NC, 27599, USA
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37
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Lock JG, Jones MC, Askari JA, Gong X, Oddone A, Olofsson H, Göransson S, Lakadamyali M, Humphries MJ, Strömblad S. Reticular adhesions are a distinct class of cell-matrix adhesions that mediate attachment during mitosis. Nat Cell Biol 2018; 20:1290-1302. [PMID: 30361699 DOI: 10.1038/s41556-018-0220-2] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Accepted: 09/21/2018] [Indexed: 12/13/2022]
Abstract
Adhesion to the extracellular matrix persists during mitosis in most cell types. However, while classical adhesion complexes, such as focal adhesions, do and must disassemble to enable mitotic rounding, the mechanisms of residual mitotic cell-extracellular matrix adhesion remain undefined. Here, we identify 'reticular adhesions', a class of adhesion complex that is mediated by integrin αvβ5, formed during interphase, and preserved at cell-extracellular matrix attachment sites throughout cell division. Consistent with this role, integrin β5 depletion perturbs mitosis and disrupts spatial memory transmission between cell generations. Reticular adhesions are morphologically and dynamically distinct from classical focal adhesions. Mass spectrometry defines their unique composition, enriched in phosphatidylinositol-4,5-bisphosphate (PtdIns(4,5)P2)-binding proteins but lacking virtually all consensus adhesome components. Indeed, reticular adhesions are promoted by PtdIns(4,5)P2, and form independently of talin and F-actin. The distinct characteristics of reticular adhesions provide a solution to the problem of maintaining cell-extracellular matrix attachment during mitotic rounding and division.
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Affiliation(s)
- John G Lock
- Department of Pathology, School of Medical Sciences, University of New South Wales, Sydney, Australia.
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.
| | - Matthew C Jones
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Janet A Askari
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Xiaowei Gong
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Anna Oddone
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain
- ICFO, Institut de Ciencies Fotoniques, Mediterranean Technology Park, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona, Spain
| | - Helene Olofsson
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Sara Göransson
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Melike Lakadamyali
- ICFO, Institut de Ciencies Fotoniques, Mediterranean Technology Park, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona, Spain
- Perelman School of Medicine, Department of Physiology, University of Pennsylvania, Philadelphia, PA, USA
| | - Martin J Humphries
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Staffan Strömblad
- Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.
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Jones MC, Askari JA, Humphries JD, Humphries MJ. Cell adhesion is regulated by CDK1 during the cell cycle. J Cell Biol 2018; 217:3203-3218. [PMID: 29930204 PMCID: PMC6122981 DOI: 10.1083/jcb.201802088] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 05/08/2018] [Accepted: 05/29/2018] [Indexed: 12/15/2022] Open
Abstract
In most tissues, anchorage-dependent growth and cell cycle progression are dependent on cells engaging extracellular matrices (ECMs) via integrin-receptor adhesion complexes. In a highly conserved manner, cells disassemble adhesion complexes, round up, and retract from their surroundings before division, suggestive of a primordial link between the cell cycle machinery and the regulation of cell adhesion to the ECM. In this study, we demonstrate that cyclin-dependent kinase 1 (CDK1) mediates this link. CDK1, in complex with cyclin A2, promotes adhesion complex and actin cytoskeleton organization during interphase and mediates a large increase in adhesion complex area as cells transition from G1 into S. Adhesion complex area decreases in G2, and disassembly occurs several hours before mitosis. This loss requires elevated cyclin B1 levels and is caused by inhibitory phosphorylation of CDK1-cyclin complexes. The inactivation of CDK1 is therefore the trigger that initiates remodeling of adhesion complexes and the actin cytoskeleton in preparation for rapid entry into mitosis.
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Affiliation(s)
- Matthew C Jones
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, England, UK
| | - Janet A Askari
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, England, UK
| | - Jonathan D Humphries
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, England, UK
| | - Martin J Humphries
- Wellcome Trust Centre for Cell-Matrix Research, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, England, UK
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39
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Durgan J, Florey O. Cancer cell cannibalism: Multiple triggers emerge for entosis. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2018; 1865:831-841. [PMID: 29548938 DOI: 10.1016/j.bbamcr.2018.03.004] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/02/2018] [Accepted: 03/06/2018] [Indexed: 12/22/2022]
Abstract
Entosis is a form of epithelial cell engulfment and cannibalism prevalent in human cancer. Until recently, the only known trigger for entosis was loss of attachment to the extracellular matrix, as often occurs in the tumour microenvironment. However, two new studies now reveal that entosis can also occur among adherent epithelial cells, induced by mitosis or glucose starvation. Together, these findings point to the intriguing notion that certain hallmark properties of cancer cells, including anchorage independence, aberrant proliferation and metabolic stress, can converge on the induction of cell cannibalism, a phenomenon so frequently observed in tumours. In this review, we explore the molecular, cellular and biophysical mechanisms underlying entosis and discuss the impact of cell cannibalism on tumour biology.
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Affiliation(s)
- J Durgan
- Babraham Institute, Cambridge, UK.
| | - O Florey
- Babraham Institute, Cambridge, UK
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40
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Dix CL, Matthews HK, Uroz M, McLaren S, Wolf L, Heatley N, Win Z, Almada P, Henriques R, Boutros M, Trepat X, Baum B. The Role of Mitotic Cell-Substrate Adhesion Re-modeling in Animal Cell Division. Dev Cell 2018; 45:132-145.e3. [PMID: 29634933 DOI: 10.1016/j.devcel.2018.03.009] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 01/17/2018] [Accepted: 03/13/2018] [Indexed: 12/24/2022]
Abstract
Animal cells undergo a dramatic series of shape changes as they divide, which depend on re-modeling of cell-substrate adhesions. Here, we show that while focal adhesion complexes are disassembled during mitotic rounding, integrins remain in place. These integrin-rich contacts connect mitotic cells to the underlying substrate throughout mitosis, guide polarized cell migration following mitotic exit, and are functionally important, since adherent cells undergo division failure when removed from the substrate. Further, the ability of cells to re-spread along pre-existing adhesive contacts is essential for division in cells compromised in their ability to construct a RhoGEF-dependent (Ect2) actomyosin ring. As a result, following Ect2 depletion, cells fail to divide on small adhesive islands but successfully divide on larger patterns, as the connection between daughter cells narrows and severs as they migrate away from one another. In this way, regulated re-modeling of cell-substrate adhesions during mitotic rounding aids division in animal cells.
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Affiliation(s)
- Christina L Dix
- MRC - Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Helen K Matthews
- MRC - Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Marina Uroz
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona 08028, Spain
| | - Susannah McLaren
- MRC - Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Lucie Wolf
- Division of Signaling and Functional Genomics, German Cancer Research Center (DKFZ), and Department for Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg University, Heidelberg 69120, Germany
| | - Nicholas Heatley
- MRC - Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Zaw Win
- MRC - Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Pedro Almada
- MRC - Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Ricardo Henriques
- MRC - Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Michael Boutros
- Division of Signaling and Functional Genomics, German Cancer Research Center (DKFZ), and Department for Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg University, Heidelberg 69120, Germany
| | - Xavier Trepat
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute for Science and Technology (BIST), Barcelona 08028, Spain; Unitat de Biofisica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona, Barcelona 08036, Spain; Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona 08010, Spain; Center for Networked Biomedical Research on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona 08028, Spain
| | - Buzz Baum
- MRC - Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK; Institute for the Physics of Living Systems, University College London, London WC1E 6BT, UK.
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41
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Mchedlishvili N, Matthews HK, Corrigan A, Baum B. Two-step interphase microtubule disassembly aids spindle morphogenesis. BMC Biol 2018; 16:14. [PMID: 29361957 PMCID: PMC5778756 DOI: 10.1186/s12915-017-0478-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Accepted: 12/22/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Entry into mitosis triggers profound changes in cell shape and cytoskeletal organisation. Here, by studying microtubule remodelling in human flat mitotic cells, we identify a two-step process of interphase microtubule disassembly. RESULTS First, a microtubule-stabilising protein, Ensconsin/MAP7, is inactivated in prophase as a consequence of its phosphorylation downstream of Cdk1/cyclin B. This leads to a reduction in interphase microtubule stability that may help to fuel the growth of centrosomally nucleated microtubules. The peripheral interphase microtubules that remain are then rapidly lost as the concentration of tubulin heterodimers falls following dissolution of the nuclear compartment boundary. Finally, we show that a failure to destabilise microtubules in prophase leads to the formation of microtubule clumps, which interfere with spindle assembly. CONCLUSIONS This analysis highlights the importance of the step-wise remodelling of the microtubule cytoskeleton and the significance of permeabilisation of the nuclear envelope in coordinating the changes in cellular organisation and biochemistry that accompany mitotic entry.
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Affiliation(s)
- Nunu Mchedlishvili
- MRC Laboratory of Molecular Cell Biology and the IPLS, University College London, Gower Street, London, WC1E 6BT, UK
| | - Helen K Matthews
- MRC Laboratory of Molecular Cell Biology and the IPLS, University College London, Gower Street, London, WC1E 6BT, UK
| | - Adam Corrigan
- MRC Laboratory of Molecular Cell Biology and the IPLS, University College London, Gower Street, London, WC1E 6BT, UK
| | - Buzz Baum
- MRC Laboratory of Molecular Cell Biology and the IPLS, University College London, Gower Street, London, WC1E 6BT, UK.
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42
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Xiao S, Tong C, Yang Y, Wu M. Mitotic Cortical Waves Predict Future Division Sites by Encoding Positional and Size Information. Dev Cell 2017; 43:493-506.e3. [DOI: 10.1016/j.devcel.2017.10.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 08/02/2017] [Accepted: 10/22/2017] [Indexed: 10/18/2022]
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43
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Üretmen Kagıalı ZC, Şentürk A, Özkan Küçük NE, Qureshi MH, Özlü N. Proteomics in Cell Division. Proteomics 2017; 17. [PMID: 28548456 DOI: 10.1002/pmic.201600100] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 04/07/2017] [Indexed: 11/08/2022]
Abstract
Cell division requires a coordinated action of the cell cycle machinery, cytoskeletal elements, chromosomes, and membranes. Cell division studies have greatly benefitted from the mass spectrometry (MS)-based proteomic approaches for probing the biochemistry of highly dynamic complexes and their coordination with each other as a cell progresses into division. In this review, the authors first summarize a wide-range of proteomic studies that focus on the identification of sub-cellular components/protein complexes of the cell division machinery including kinetochores, mitotic spindle, midzone, and centrosomes. The authors also highlight MS-based large-scale analyses of the cellular components that are largely understudied during cell division such as the cell surface and lipids. Then, the authors focus on posttranslational modification analyses, especially phosphorylation and the resulting crosstalk with other modifications as a cell undergoes cell division. Combining proteomic approaches that probe the biochemistry of cell division components with functional genomic assays will lead to breakthroughs toward a systems-level understanding of cell division.
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Affiliation(s)
| | - Aydanur Şentürk
- Department of Molecular Biology and Genetics, Koç University, Istanbul, Turkey
| | | | - Mohammad Haroon Qureshi
- Department of Molecular Biology and Genetics, Koç University, Istanbul, Turkey.,Biomedical Sciences and Engineering, Koç University, Istanbul, Turkey
| | - Nurhan Özlü
- Department of Molecular Biology and Genetics, Koç University, Istanbul, Turkey
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44
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Jinesh GG, Kamat AM. The Blebbishield Emergency Program Overrides Chromosomal Instability and Phagocytosis Checkpoints in Cancer Stem Cells. Cancer Res 2017; 77:6144-6156. [PMID: 28855211 DOI: 10.1158/0008-5472.can-17-0522] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 06/13/2017] [Accepted: 08/22/2017] [Indexed: 11/16/2022]
Abstract
Genomic instability and immune evasion are hallmarks of cancer. Apoptotic cancer stem cells can evade cell death by undergoing cellular transformation by constructing "blebbishields" from apoptotic bodies. In this study, we report a novel linkage between genomic instability and phagocytosis evasion that is coordinated by the blebbishield emergency program. Blebbishield emergency program evaded genomic instability checkpoint, expressed genomic instability-associated genes at distinct phases of cellular transformation, exhibited chromosomal instability, and promoted increase in nuclear size. Blebbishields fused with immune cells to evade phagocytosis, and the resultant hybrid cells exhibited increased migration, tumorigenesis, metastasis, red blood cell recruitment to tumors, and induced hepatosplenomegaly with signatures of genomic instability, blebbishield emergency program, and phagocytosis evasion to offer poor prognosis. Overall, our data demonstrate that the blebbishield emergency program drives evasion of chromosomal instability and phagocytosis checkpoints by apoptotic cancer stem cells. Cancer Res; 77(22); 6144-56. ©2017 AACR.
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Affiliation(s)
- Goodwin G Jinesh
- Department of Urology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
| | - Ashish M Kamat
- Department of Urology, The University of Texas MD Anderson Cancer Center, Houston, Texas.
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45
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Inaba H, Yoda K, Adachi H. The F-actin-binding RapGEF GflB is required for efficient macropinocytosis in Dictyostelium. J Cell Sci 2017; 130:3158-3172. [PMID: 28778987 DOI: 10.1242/jcs.194126] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 07/26/2017] [Indexed: 01/06/2023] Open
Abstract
Macropinocytosis involves the uptake of large volumes of fluid, which is regulated by various small GTPases. The Dictyostelium discoideum protein GflB is a guanine nucleotide exchange factor (GEF) of Rap1, and is involved in chemotaxis. Here, we studied the role of GflB in macropinocytosis, phagocytosis and cytokinesis. In plate culture of vegetative cells, compared with the parental strain AX2, gflB-knockout (KO) cells were flatter and more polarized, whereas GflB-overproducing cells were rounder. The gflB-KO cells exhibited impaired crown formation and retraction, particularly retraction, resulting in more crowns (macropinocytic cups) per cell and longer crown lifetimes. Accordingly, gflB-KO cells showed defects in macropinocytosis and also in phagocytosis and cytokinesis. F-actin levels were elevated in gflB-KO cells. GflB localized to the actin cortex most prominently at crowns and phagocytic cups. The villin headpiece domain (VHP)-like N-terminal domain of GflB directly interacted with F-actin in vitro Furthermore, a domain enriched in basic amino acids interacted with specific membrane cortex structures such as the cleavage furrow. In conclusion, GflB acts as a key local regulator of actin-driven membrane protrusion possibly by modulating Rap1 signaling pathways.
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Affiliation(s)
- Hironori Inaba
- Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan.,Department of Cell Biology, Graduate School of Medical and Dental Science, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8510, Japan.,The Center for Brain Integration Research, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Koji Yoda
- Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Hiroyuki Adachi
- Department of Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
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46
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Durgan J, Tseng YY, Hamann JC, Domart MC, Collinson L, Hall A, Overholtzer M, Florey O. Mitosis can drive cell cannibalism through entosis. eLife 2017; 6:e27134. [PMID: 28693721 PMCID: PMC5505699 DOI: 10.7554/elife.27134] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 06/13/2017] [Indexed: 12/12/2022] Open
Abstract
Entosis is a form of epithelial cell cannibalism that is prevalent in human cancer, typically triggered by loss of matrix adhesion. Here, we report an alternative mechanism for entosis in human epithelial cells, driven by mitosis. Mitotic entosis is regulated by Cdc42, which controls mitotic morphology. Cdc42 depletion enhances mitotic deadhesion and rounding, and these biophysical changes, which depend on RhoA activation and are phenocopied by Rap1 inhibition, permit subsequent entosis. Mitotic entosis occurs constitutively in some human cancer cell lines and mitotic index correlates with cell cannibalism in primary human breast tumours. Adherent, wild-type cells can act efficiently as entotic hosts, suggesting that normal epithelia may engulf and kill aberrantly dividing neighbours. Finally, we report that Paclitaxel/taxol promotes mitotic rounding and subsequent entosis, revealing an unconventional activity of this drug. Together, our data uncover an intriguing link between cell division and cannibalism, of significance to both cancer and chemotherapy.
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Affiliation(s)
- Joanne Durgan
- The Babraham Institute, Cambridge, United Kingdom
- Memorial Sloan Kettering Cancer Center, New York, United States
| | - Yun-Yu Tseng
- Memorial Sloan Kettering Cancer Center, New York, United States
- Weill Graduate School of Medical Sciences, Cornell University, New York, United States
| | - Jens C Hamann
- Memorial Sloan Kettering Cancer Center, New York, United States
- Louis V Gerstner Jr Graduate School of Biomedical Sciences, New York, United States
| | | | | | - Alan Hall
- Memorial Sloan Kettering Cancer Center, New York, United States
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47
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Hilbi H, Kortholt A. Role of the small GTPase Rap1 in signal transduction, cell dynamics and bacterial infection. Small GTPases 2017. [PMID: 28632994 DOI: 10.1080/21541248.2017.1331721] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Rap1 belongs to the Ras family of small GTPases, which are involved in a multitude of cellular signal transduction pathways and have extensively been linked to cancer biogenesis and metastasis. The small GTPase is activated in response to various extracellular and intracellular cues. Rap1 has conserved functions in Dictyostelium discoideum amoeba and mammalian cells, which are important for cell polarity, substrate and cell-cell adhesion and other processes that involve the regulation of cytoskeletal dynamics. Moreover, our recent study has shown that Rap1 is required for the formation of the replication-permissive vacuole of an intracellular bacterial pathogen. Here we review the function and regulation of Rap1 in these distinct processes, and we discuss the underlying signal transduction pathways.
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Affiliation(s)
- Hubert Hilbi
- a Institute of Medical Microbiology, University of Zürich , Zürich , Switzerland
| | - Arjan Kortholt
- b Department of Cell Biochemistry, University of Groningen , Groningen , The Netherlands
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48
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SHANK proteins limit integrin activation by directly interacting with Rap1 and R-Ras. Nat Cell Biol 2017; 19:292-305. [PMID: 28263956 PMCID: PMC5386136 DOI: 10.1038/ncb3487] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 02/06/2017] [Indexed: 12/17/2022]
Abstract
SHANK3, a synaptic scaffold protein and actin regulator, is widely
expressed outside of the central nervous system with predominantly unknown
function. Solving the structure of the SHANK3 N-terminal region revealed that
the SPN-domain is an unexpected Ras-association domain with high affinity for
GTP-bound Ras and Rap G-proteins. The role of Rap1 in integrin activation is
well established but the mechanisms to antagonize it remain largely unknown.
Here, we show that SHANK1 and SHANK3 act as integrin activation inhibitors by
sequestering active Rap1 and R-Ras via the SPN-domain and thus limiting their
bioavailability at the plasma membrane. Consistently, SHANK3
silencing triggers increased plasma membrane Rap1 activity, cell spreading,
migration and invasion. Autism-related mutations within the SHANK3 SPN-domain
(R12C and L68P) disrupt G-protein interaction and fail to counteract integrin
activation along the Rap1/RIAM/talin axis in cancer cells and neurons.
Altogether, we establish SHANKs as critical regulators of G-protein signalling
and integrin-dependent processes.
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Cellular Reorganization during Mitotic Entry. Trends Cell Biol 2017; 27:26-41. [DOI: 10.1016/j.tcb.2016.07.004] [Citation(s) in RCA: 93] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 07/14/2016] [Accepted: 07/18/2016] [Indexed: 12/27/2022]
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Abstract
Animal cells undergo dramatic changes in shape, mechanics and polarity as they progress through the different stages of cell division. These changes begin at mitotic entry, with cell-substrate adhesion remodelling, assembly of a cortical actomyosin network and osmotic swelling, which together enable cells to adopt a near spherical form even when growing in a crowded tissue environment. These shape changes, which probably aid spindle assembly and positioning, are then reversed at mitotic exit to restore the interphase cell morphology. Here, we discuss the dynamics, regulation and function of these processes, and how cell shape changes and sister chromatid segregation are coupled to ensure that the daughter cells generated through division receive their fair inheritance.
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