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Frey Y, Lungu C, Meyer F, Hauth F, Hahn D, Kersten C, Heller V, Franz-Wachtel M, Macek B, Barsukov I, Olayioye MA. Regulation of the DLC3 tumor suppressor by a novel phosphoswitch. iScience 2024; 27:110203. [PMID: 39021807 PMCID: PMC11253157 DOI: 10.1016/j.isci.2024.110203] [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: 10/17/2023] [Revised: 03/04/2024] [Accepted: 06/04/2024] [Indexed: 07/20/2024] Open
Abstract
Deleted in liver cancer 3 (DLC3) is a Rho GTPase-activating protein (RhoGAP) that plays a crucial role in maintaining adherens junction integrity and coordinating polarized vesicle transport by modulating Rho activity at the plasma membrane and endomembranes. By employing bioinformatical sequence analysis, in vitro experiments, and in cellulo assays we here identified a polybasic region (PBR) in DLC3 that facilitates the association of the protein with cellular membranes. Within the PBR, we mapped two serines whose phosphorylation can alter the electrostatic character of the region. Consequently, phosphomimetic mutations of these sites impaired the membrane association of DLC3. Furthermore, we found a new PBR-dependent localization of DLC3 at the midbody region, where the protein locally controlled Rho activity. Here, the phosphorylation-dependent regulation of DLC3 appeared to be required for proper cytokinesis. Our work thus provides a novel mechanism for spatiotemporal termination of Rho signaling by the RhoGAP protein DLC3.
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Affiliation(s)
- Yannick Frey
- University of Stuttgart, Institute of Cell Biology and Immunology, Stuttgart, Germany
| | - Cristiana Lungu
- University of Stuttgart, Institute of Cell Biology and Immunology, Stuttgart, Germany
- University of Stuttgart, Stuttgart Research Center Systems Biology, Stuttgart, Germany
| | - Florian Meyer
- University of Stuttgart, Institute of Cell Biology and Immunology, Stuttgart, Germany
| | - Franziskus Hauth
- University of Liverpool, Institute of Systems, Molecular and Integrative Biology, Department of Biochemistry, Cell and Systems Biology, Liverpool, UK
| | - Daniel Hahn
- University of Stuttgart, Institute of Cell Biology and Immunology, Stuttgart, Germany
| | - Corinna Kersten
- University of Stuttgart, Institute of Cell Biology and Immunology, Stuttgart, Germany
| | - Vivien Heller
- University of Stuttgart, Institute of Cell Biology and Immunology, Stuttgart, Germany
| | | | - Boris Macek
- Proteome Center Tübingen, University of Tübingen, Tübingen, Germany
| | - Igor Barsukov
- University of Liverpool, Institute of Systems, Molecular and Integrative Biology, Department of Biochemistry, Cell and Systems Biology, Liverpool, UK
| | - Monilola A. Olayioye
- University of Stuttgart, Institute of Cell Biology and Immunology, Stuttgart, Germany
- University of Stuttgart, Stuttgart Research Center Systems Biology, Stuttgart, Germany
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2
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Lungu C, Meyer F, Hörning M, Steudle J, Braun A, Noll B, Benz D, Fränkle F, Schmid S, Eisler SA, Olayioye MA. Golgi screen identifies the RhoGEF Solo as a novel regulator of RhoB and endocytic transport. Traffic 2023; 24:162-176. [PMID: 36562184 DOI: 10.1111/tra.12880] [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: 12/02/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022]
Abstract
The control of intracellular membrane trafficking by Rho GTPases is central to cellular homeostasis. How specific guanine nucleotide exchange factors and GTPase-activating proteins locally balance GTPase activation in this process is nevertheless largely unclear. By performing a microscopy-based RNAi screen, we here identify the RhoGEF protein Solo as a functional counterplayer of DLC3, a RhoGAP protein with established roles in membrane trafficking. Biochemical, imaging and optogenetics assays further uncover Solo as a novel regulator of endosomal RhoB. Remarkably, we find that Solo and DLC3 control not only the activity, but also total protein levels of RhoB in an antagonistic manner. Together, the results of our study uncover the first functionally connected RhoGAP-RhoGEF pair at endomembranes, placing Solo and DLC3 at the core of endocytic trafficking.
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Affiliation(s)
- Cristiana Lungu
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany.,Stuttgart Research Center Systems Biology (SRCSB), University of Stuttgart, Stuttgart, Germany
| | - Florian Meyer
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Marcel Hörning
- Stuttgart Research Center Systems Biology (SRCSB), University of Stuttgart, Stuttgart, Germany.,Institute of Biomaterials and Biomolecular Systems, Biobased Materials Group, University of Stuttgart, Stuttgart, Germany
| | - Jasmin Steudle
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Anja Braun
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Bettina Noll
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany.,Stuttgart Research Center Systems Biology (SRCSB), University of Stuttgart, Stuttgart, Germany
| | - David Benz
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Felix Fränkle
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Simone Schmid
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany
| | - Stephan A Eisler
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany.,Stuttgart Research Center Systems Biology (SRCSB), University of Stuttgart, Stuttgart, Germany
| | - Monilola A Olayioye
- Institute of Cell Biology and Immunology, University of Stuttgart, Stuttgart, Germany.,Stuttgart Research Center Systems Biology (SRCSB), University of Stuttgart, Stuttgart, Germany
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3
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Kreider-Letterman G, Castillo A, Mahlandt EK, Goedhart J, Rabino A, Goicoechea S, Garcia-Mata R. ARHGAP17 regulates the spatiotemporal activity of Cdc42 at invadopodia. J Cell Biol 2022; 222:213782. [PMID: 36571786 PMCID: PMC9794838 DOI: 10.1083/jcb.202207020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 10/18/2022] [Accepted: 11/28/2022] [Indexed: 12/27/2022] Open
Abstract
Invadopodia formation is regulated by Rho GTPases. However, the molecular mechanisms that control Rho GTPase signaling at invadopodia remain poorly understood. Here, we have identified ARHGAP17, a Cdc42-specific RhoGAP, as a key regulator of invadopodia in breast cancer cells and characterized a novel ARHGAP17-mediated signaling pathway that controls the spatiotemporal activity of Cdc42 during invadopodia turnover. Our results show that during invadopodia assembly, ARHGAP17 localizes to the invadopodia ring and restricts the activity of Cdc42 to the invadopodia core, where it promotes invadopodia growth. Invadopodia disassembly starts when ARHGAP17 translocates from the invadopodia ring to the core, in a process that is mediated by its interaction with the Cdc42 effector CIP4. Once at the core, ARHGAP17 inactivates Cdc42 to promote invadopodia disassembly. Our results in invadopodia provide new insights into the coordinated transition between the activation and inactivation of Rho GTPases.
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Affiliation(s)
| | - Abel Castillo
- https://ror.org/01pbdzh19Department of Biological Sciences, University of Toledo, Toledo, OH, USA
| | - Eike K. Mahlandt
- https://ror.org/04dkp9463Swammerdam Institute for Life Sciences, Section of Molecular Cytology, van Leeuwenhoek Centre for Advanced Microscopy, University of Amsterdam, Amsterdam, The Netherlands
| | - Joachim Goedhart
- https://ror.org/04dkp9463Swammerdam Institute for Life Sciences, Section of Molecular Cytology, van Leeuwenhoek Centre for Advanced Microscopy, University of Amsterdam, Amsterdam, The Netherlands
| | - Agustin Rabino
- https://ror.org/01pbdzh19Department of Biological Sciences, University of Toledo, Toledo, OH, USA
| | - Silvia Goicoechea
- https://ror.org/01pbdzh19Department of Biological Sciences, University of Toledo, Toledo, OH, USA
| | - Rafael Garcia-Mata
- https://ror.org/01pbdzh19Department of Biological Sciences, University of Toledo, Toledo, OH, USA,Correspondence to Rafael Garcia-Mata:
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4
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Nahaboo W, Eski SE, Despin-Guitard E, Vermeersch M, Versaevel M, Saykali B, Monteyne D, Gabriele S, Magin TM, Schwarz N, Leube RE, Zwijsen A, Perez-Morga D, Singh SP, Migeotte I. Keratin filaments mediate the expansion of extra-embryonic membranes in the post-gastrulation mouse embryo. EMBO J 2022; 41:e108747. [PMID: 35266581 PMCID: PMC8982622 DOI: 10.15252/embj.2021108747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 01/21/2022] [Accepted: 01/24/2022] [Indexed: 01/22/2023] Open
Abstract
Mesoderm arises at gastrulation and contributes to both the mouse embryo proper and its extra-embryonic membranes. Two-photon live imaging of embryos bearing a keratin reporter allowed recording filament nucleation and elongation in the extra-embryonic region. Upon separation of amniotic and exocoelomic cavities, keratin 8 formed apical cables co-aligned across multiple cells in the amnion, allantois, and blood islands. An influence of substrate rigidity and composition on cell behavior and keratin content was observed in mesoderm explants. Embryos lacking all keratin filaments displayed a deflated extra-embryonic cavity, a narrow thick amnion, and a short allantois. Single-cell RNA sequencing of sorted mesoderm cells and micro-dissected amnion, chorion, and allantois, provided an atlas of transcriptomes with germ layer and regional information. It defined the cytoskeleton and adhesion expression profile of mesoderm-derived keratin 8-enriched cells lining the exocoelomic cavity. Those findings indicate a novel role for keratin filaments in the expansion of extra-embryonic structures and suggest mechanisms of mesoderm adaptation to the environment.
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Affiliation(s)
- Wallis Nahaboo
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium
| | - Sema Elif Eski
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium
| | - Evangéline Despin-Guitard
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium
| | - Marjorie Vermeersch
- Center for Microscopy and Molecular Imaging (CMMI), Université Libre de Bruxelles, Gosselies, Belgium
| | - Marie Versaevel
- Mechanobiology and Soft Matter Group, Research Institute for Biosciences, University of Mons, Mons, Belgium
| | - Bechara Saykali
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium
| | - Daniel Monteyne
- Center for Microscopy and Molecular Imaging (CMMI), Université Libre de Bruxelles, Gosselies, Belgium
| | - Sylvain Gabriele
- Mechanobiology and Soft Matter Group, Research Institute for Biosciences, University of Mons, Mons, Belgium
| | - Thomas M Magin
- Division of Cell & Developmental Biology, Institute of Biology, Leipzig University, Leipzig, Germany
| | - Nicole Schwarz
- Institute of Molecular and Cellular Anatomy, RWTH Aachen University, Aachen, Germany
| | - Rudolf E Leube
- Institute of Molecular and Cellular Anatomy, RWTH Aachen University, Aachen, Germany
| | | | - David Perez-Morga
- Center for Microscopy and Molecular Imaging (CMMI), Université Libre de Bruxelles, Gosselies, Belgium.,Laboratory of Molecular Parasitology, IBMM, Université Libre de Bruxelles, Gosselies, Belgium
| | - Sumeet Pal Singh
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium
| | - Isabelle Migeotte
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium
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5
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Soelch S, Beaufort N, Loessner D, Kotzsch M, Reuning U, Luther T, Kirchner T, Magdolen V. Rab31-dependent regulation of transforming growth factor ß expression in breast cancer cells. Mol Med 2021; 27:158. [PMID: 34906074 PMCID: PMC8670132 DOI: 10.1186/s10020-021-00419-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 12/01/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The small GTP-binding protein Rab31 plays an important role in the modulation of tumor biological-relevant processes, including cell proliferation, adhesion, and invasion. As an underlying mechanism, Rab31 is presumed to act as a molecular switch between a more proliferative and an invasive phenotype. This prompted us to analyze whether Rab31 overexpression in breast cancer cells affects expression of genes involved in epithelial-to-mesenchymal transition (EMT)-like processes when compared to Rab31 low-expressing cells. METHODS Commercially available profiler PCR arrays were applied to search for differentially expressed genes in Rab31 high- and low-expressing CAMA-1 breast cancer cells. Differential expression of selected candidate genes in response to Rab31 overexpression in CAMA-1 cells was validated by independent qPCR and protein assays. RESULTS Gene expression profiling of key genes involved in EMT, or its reciprocal process MET, identified 9 genes being significantly up- or down-regulated in Rab31 overexpressing CAMA-1 cells, with the strongest effects seen for TGFB1, encoding TGF-ß1 (> 25-fold down-regulation in Rab31 overexpressing cells). Subsequent validation analyses by qPCR revealed a strong down-regulation of TGFB1 mRNA levels in response to increased Rab31 expression not only in CAMA-1 cells, but also in another breast cancer cell line, MDA-MB-231. Using ELISA and Western blot analysis, a considerable reduction of both intracellular and secreted TGF-ß1 antigen levels was determined in Rab31 overexpressing cells compared to vector control cells. Furthermore, reduced TGF-ß activity was observed upon Rab31 overexpression in CAMA-1 cells using a sensitive TGF-ß bioassay. Finally, the relationship between Rab31 expression and the TGF-ß axis was analyzed by another profiler PCR array focusing on genes involved in TGF-ß signaling. We found 12 out of 84 mRNAs significantly reduced and 7 mRNAs significantly increased upon Rab31 overexpression. CONCLUSIONS Our results demonstrate that Rab31 is a potent modulator of the expression of TGF-ß and other components of the TGF-ß signaling pathway in breast cancer cells.
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Affiliation(s)
- Susanne Soelch
- Clinical Research Unit, Department of Obstetrics and Gynecology, Technische Universität München, Ismaninger Str. 22, 81576, Munich, Germany
| | - Nathalie Beaufort
- Institute for Stroke and Dementia Research, Klinikum Der Universität München, Munich, Germany
| | - Daniela Loessner
- Leibniz-Institut für Polymerforschung Dresden e.V, Dresden, Germany.,Faculty of Engineering and Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, VIC, Australia
| | | | - Ute Reuning
- Clinical Research Unit, Department of Obstetrics and Gynecology, Technische Universität München, Ismaninger Str. 22, 81576, Munich, Germany
| | | | | | - Viktor Magdolen
- Clinical Research Unit, Department of Obstetrics and Gynecology, Technische Universität München, Ismaninger Str. 22, 81576, Munich, Germany.
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6
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Bao Z, Zhou S, Zhou H. Sorting Nexin 27 as a potential target in G protein‑coupled receptor recycling for cancer therapy (Review). Oncol Rep 2020; 44:1779-1786. [PMID: 33000258 PMCID: PMC7551096 DOI: 10.3892/or.2020.7766] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 08/10/2020] [Indexed: 12/12/2022] Open
Abstract
G protein-coupled receptors (GPCRs) are the largest family of membrane receptors and activate several downstream signaling pathways involved in numerous physiological cellular processes. GPCRs are usually internalized and desensitized by intracellular signals. Numerous studies have shown that several GPCRs interact with sorting nexin 27 (SNX27), a cargo selector of the retromer complex, and are recycled from endosomes to the plasma membrane. Recycled GPCRs usually contain specific C-terminal postsynaptic density protein 95/Discs large protein/Zonula occludens 1 (PDZ) binding motifs, which are specifically recognized by SNX27, and return to the cell surface as functionally naïve receptors. Aberrant endosome-to-membrane recycling of GPCRs mediated by SNX27 may serve a critical role in cancer growth and development. Therefore, SNX27 may be a novel target for cancer therapies.
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Affiliation(s)
- Zixu Bao
- Department of Biochemistry and Molecular Biology, Anhui Medical University, Hefei, Anhui 230032, P.R. China
| | - Shijun Zhou
- Department of Infectious Disease, The Second Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230601, P.R. China
| | - Haisheng Zhou
- Department of Biochemistry and Molecular Biology, Anhui Medical University, Hefei, Anhui 230032, P.R. China
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7
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Clark BJ. The START-domain proteins in intracellular lipid transport and beyond. Mol Cell Endocrinol 2020; 504:110704. [PMID: 31927098 DOI: 10.1016/j.mce.2020.110704] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 01/08/2020] [Accepted: 01/08/2020] [Indexed: 12/17/2022]
Abstract
The Steroidogenic Acute Regulatory Protein-related Lipid Transfer (START) domain is a ~210 amino acid sequence that folds into an α/β helix-grip structure forming a hydrophobic pocket for lipid binding. The helix-grip fold structure defines a large superfamily of proteins, and this review focuses on the mammalian START domain family members that include single START domain proteins with identified ligands, and larger multi-domain proteins that may have novel roles in metabolism. Much of our understanding of the mammalian START domain proteins in lipid transport and changes in metabolism has advanced through studies using knockout mouse models, although for some of these proteins the identity and/or physiological role of ligand binding remains unknown. The findings that helped define START domain lipid-binding specificity, lipid transport, and changes in metabolism are presented to highlight that fundamental questions remain regarding the biological function(s) for START domain-containing proteins.
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Affiliation(s)
- Barbara J Clark
- Department of Biochemistry & Molecular Genetics, University of Louisville School of Medicine, Louisville, KY, 40292, USA.
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8
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Olayioye MA, Noll B, Hausser A. Spatiotemporal Control of Intracellular Membrane Trafficking by Rho GTPases. Cells 2019; 8:cells8121478. [PMID: 31766364 PMCID: PMC6952795 DOI: 10.3390/cells8121478] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 11/15/2019] [Accepted: 11/18/2019] [Indexed: 12/17/2022] Open
Abstract
As membrane-associated master regulators of cytoskeletal remodeling, Rho GTPases coordinate a wide range of biological processes such as cell adhesion, motility, and polarity. In the last years, Rho GTPases have also been recognized to control intracellular membrane sorting and trafficking steps directly; however, how Rho GTPase signaling is regulated at endomembranes is still poorly understood. In this review, we will specifically address the local Rho GTPase pools coordinating intracellular membrane trafficking with a focus on the endo- and exocytic pathways. We will further highlight the spatiotemporal molecular regulation of Rho signaling at endomembrane sites through Rho regulatory proteins, the GEFs and GAPs. Finally, we will discuss the contribution of dysregulated Rho signaling emanating from endomembranes to the development and progression of cancer.
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