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The Relationship between Mutations in Gene-Specific Domains of Salivary Fibronectin (cFn) and Dynamin-2 (Dynm-2) and the Development of Porphyromonas gingivalis-Initiated Periodontitis. JOURNAL OF MOLECULAR PATHOLOGY 2022. [DOI: 10.3390/jmp3030015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Periodontitis is a chronic inflammatory disease characterized by the destruction of the supporting structures of the teeth. Its high prevalence and negative effects on quality of life make it one of the current problems in dentistry. Porphyromonas gingivalis (P. gingivalis) is the predominant periodontal pathogen that expresses a number of virulence factors involved in the pathogenesis of periodontitis. P. gingivalis fimbriae are a critical factor in the interaction between the organism and the host tissue. They promote both bacterial adhesion and invasion into the target sites. Fimbriae are capable of binding to human saliva components, extracellular matrix proteins, and commensal bacteria, as well as firmly binding to the cellular integrin α5β1. After attachment to α5β1-integrin, P. gingivalis is captured by cellular pseudopodia, which makes invagination through an actin-mediated pathway possible. It has been proven that the invagination event also requires the participation of the host cell dynamin, actin fibers, microtubules and lipid rafts. Work has emerged investigating mutations in the proline-rich terminal domain (PRD) and their impact on disease development. Salivary antimicrobial peptides are early protective factors against microbial attack. Of great interest is fibronectin (FN) as the main competitor of P. gingivalis fimbriae. The FN can interact with cells in three different regions: the central cell-binding domain (CCBD), the COOH terminal heparin-binding domain (Hep2), and the type III connecting segment (IIICS), including the CS1 region (Yamada, 1991). CCBD is the major cell-adhesion domain of FN and contains an Arg–Gly–Asp (RGD) motif that is recognized by members of the cell adhesion receptor integrin family, including a5b1, which is the primary FN receptor in many cell types. The work focuses on identifying the relationship between the development of periodontitis and the presence of mutations in the adhesion domains of salivary proteins such as cellular fibronectin (cFN) and dynamin-2 (DYNM2).
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Guo R, Fujito R, Nagasaki A, Okumura M, Chihara T, Hamao K. Dynamin-2 regulates microtubule stability via an endocytosis-independent mechanism. Cytoskeleton (Hoboken) 2022; 79:94-104. [PMID: 36053962 DOI: 10.1002/cm.21723] [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: 03/01/2022] [Revised: 06/03/2022] [Accepted: 07/07/2022] [Indexed: 01/30/2023]
Abstract
Microtubule stability and dynamics regulations are essential for vital cellular processes, such as microtubule-dependent axonal transport. Dynamin is involved in many membrane fission events, such as clathrin-mediated endocytosis. The ubiquitously expressed dynamin-2 has been reported to regulate microtubule stability. However, the underlying molecular mechanisms remain unclear. This study aimed to investigate the roles of intrinsic properties of dynamin-2 on microtubule regulation by rescue experiments. A heterozygous DNM2 mutation in HeLa cells was generated, and an increase in the level of stabilized microtubules in these heterozygous cells was observed. The expression of wild-type dynamin-2 in heterozygous cells reduced stabilized microtubules. Conversely, the expression of self-assembly-defective mutants of dynamin-2 in the heterozygous cells failed to decrease stabilized microtubules. This indicated that the self-assembling ability of dynamin-2 is necessary for regulating microtubule stability. Moreover, the heterozygous cells expressing the GTPase-defective dynamin-2 mutant, K44A, reduced microtubule stabilization, similar to the cells expressing wild-type dynamin-2, suggesting that GTPase activity of dynamin-2 is not essential for regulating microtubule stability. These results showed that the mechanism of microtubule regulation by dynamin-2 is diverse from that of endocytosis.
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Affiliation(s)
- Runzhao Guo
- Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
| | - Ryuji Fujito
- Program of Basic Biology, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
| | - Akira Nagasaki
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan
| | - Misako Okumura
- Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan.,Program of Basic Biology, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
| | - Takahiro Chihara
- Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan.,Program of Basic Biology, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
| | - Kozue Hamao
- Program of Biomedical Science, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan.,Program of Basic Biology, Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, Japan
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Štimac I, Jug Vučko N, Blagojević Zagorac G, Marcelić M, Mahmutefendić Lučin H, Lučin P. Dynamin Inhibitors Prevent the Establishment of the Cytomegalovirus Assembly Compartment in the Early Phase of Infection. Life (Basel) 2021; 11:876. [PMID: 34575026 PMCID: PMC8469281 DOI: 10.3390/life11090876] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 08/21/2021] [Accepted: 08/23/2021] [Indexed: 12/30/2022] Open
Abstract
Cytomegalovirus (CMV) infection initiates massive rearrangement of cytoplasmic organelles to generate assembly compartment (AC). The earliest events, the establishment of the preAC, are initiated in the early phase as an extensive reorganization of early endosomes (EEs), endosomal recycling compartment (ERC), trans-Golgi network (TGN), and the Golgi. Here, we demonstrate that dynamin inhibitors (Dynasore, Dyngo-4a, MiTMAB, and Dynole-34-2) block the establishment of the preAC in murine CMV (MCMV) infected cells. In this study, we extensively analyzed the effect of Dynasore on the Golgi reorganization sequence into the outer preAC. We also monitored the development of the inner preAC using a set of markers that define EEs (Rab5, Vps34, EEA1, and Hrs), the EE-ERC interface (Rab10), the ERC (Rab11, Arf6), three layers of the Golgi (GRASP65, GM130, Golgin97), and late endosomes (Lamp1). Dynasore inhibited the pericentriolar accumulation of all markers that display EE-ERC-TGN interface in the inner preAC and prevented Golgi unlinking and dislocation to the outer preAC. Furthermore, in pulse-chase experiments, we demonstrated that the presence of dynasore only during the early phase of MCMV infection (4-14 hpi) is sufficient to prevent not only AC formation but also the synthesis of late-phase proteins and virion production. Therefore, our results indicate that dynamin-2 acts as a part of the machinery required for AC generation and rearrangement of EE/ERC/Golgi membranes in the early phase of CMV infection.
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Affiliation(s)
- Igor Štimac
- Department of Physiology and Immunology, Faculty of Medicine, University of Rijeka, 51000 Rijeka, Croatia; (I.Š.); (N.J.V.); (G.B.Z.); (M.M.); (P.L.)
| | - Natalia Jug Vučko
- Department of Physiology and Immunology, Faculty of Medicine, University of Rijeka, 51000 Rijeka, Croatia; (I.Š.); (N.J.V.); (G.B.Z.); (M.M.); (P.L.)
| | - Gordana Blagojević Zagorac
- Department of Physiology and Immunology, Faculty of Medicine, University of Rijeka, 51000 Rijeka, Croatia; (I.Š.); (N.J.V.); (G.B.Z.); (M.M.); (P.L.)
- Nursing Department, University North, University Center Varaždin, Jurja Križanića 31b, 42000 Varaždin, Croatia
| | - Marina Marcelić
- Department of Physiology and Immunology, Faculty of Medicine, University of Rijeka, 51000 Rijeka, Croatia; (I.Š.); (N.J.V.); (G.B.Z.); (M.M.); (P.L.)
| | - Hana Mahmutefendić Lučin
- Department of Physiology and Immunology, Faculty of Medicine, University of Rijeka, 51000 Rijeka, Croatia; (I.Š.); (N.J.V.); (G.B.Z.); (M.M.); (P.L.)
- Nursing Department, University North, University Center Varaždin, Jurja Križanića 31b, 42000 Varaždin, Croatia
| | - Pero Lučin
- Department of Physiology and Immunology, Faculty of Medicine, University of Rijeka, 51000 Rijeka, Croatia; (I.Š.); (N.J.V.); (G.B.Z.); (M.M.); (P.L.)
- Nursing Department, University North, University Center Varaždin, Jurja Križanića 31b, 42000 Varaždin, Croatia
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4
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Arriagada-Diaz J, Prado-Vega L, Cárdenas Díaz AM, Ardiles AO, Gonzalez-Jamett AM. Dynamin Superfamily at Pre- and Postsynapses: Master Regulators of Synaptic Transmission and Plasticity in Health and Disease. Neuroscientist 2020; 28:41-58. [PMID: 33300419 DOI: 10.1177/1073858420974313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Dynamin superfamily proteins (DSPs) comprise a large group of GTP-ases that orchestrate membrane fusion and fission, and cytoskeleton remodeling in different cell-types. At the central nervous system, they regulate synaptic vesicle recycling and signaling-receptor turnover, allowing the maintenance of synaptic transmission. In the presynapses, these GTP-ases control the recycling of synaptic vesicles influencing the size of the ready-releasable pool and the release of neurotransmitters from nerve terminals, whereas in the postsynapses, they are involved in AMPA-receptor trafficking to and from postsynaptic densities, supporting excitatory synaptic plasticity, and consequently learning and memory formation. In agreement with these relevant roles, an important number of neurological disorders are associated with mutations and/or dysfunction of these GTP-ases. Along the present review we discuss the importance of DSPs at synapses and their implication in different neuropathological contexts.
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Affiliation(s)
- Jorge Arriagada-Diaz
- Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile.,Programa de Magister en Ciencias, mención Neurociencia, Universidad de Valparaíso, Valparaíso, Chile
| | - Lorena Prado-Vega
- Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile.,Programa de Magister en Ciencias, mención Neurociencia, Universidad de Valparaíso, Valparaíso, Chile
| | - Ana M Cárdenas Díaz
- Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
| | - Alvaro O Ardiles
- Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile.,Centro de Neurología Traslacional, Facultad de Medicina, Universidad de Valparaíso, Valparaíso, Chile.,Centro Interdisciplinario de Estudios en Salud, Facultad de Medicina, Universidad de Valparaíso, Viña del Mar, Chile
| | - Arlek M Gonzalez-Jamett
- Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
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5
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Banerjee A, Kulkarni S, Mukherjee A. Herpes Simplex Virus: The Hostile Guest That Takes Over Your Home. Front Microbiol 2020; 11:733. [PMID: 32457704 PMCID: PMC7221137 DOI: 10.3389/fmicb.2020.00733] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 03/30/2020] [Indexed: 12/15/2022] Open
Abstract
Alpha (α)-herpesviruses (HSV-1 and HSV-2), like other viruses, are obligate intracellular parasites. They hijack the cellular machinery to survive and replicate through evading the defensive responses by the host. The viral genome of herpes simplex viruses (HSVs) contains viral genes, the products of which are destined to exploit the host apparatus for their own existence. Cellular modulations begin from the entry point itself. The two main gateways that the virus has to penetrate are the cell membrane and the nuclear membrane. Changes in the cell membrane are triggered when the glycoproteins of HSV interact with the surface receptors of the host cell, and from here, the components of the cytoskeleton take over. The rearrangement in the cytoskeleton components help the virus to enter as well as transport to the nucleus and back to the cell membrane to spread out to the other cells. The entire carriage process is also mediated by the motor proteins of the kinesin and dynein superfamily and is directed by the viral tegument proteins. Also, the virus captures the cell’s most efficient cargo carrying system, the endoplasmic reticulum (ER)–Golgi vesicular transport machinery for egress to the cell membrane. For these reasons, the host cell has its own checkpoints where the normal functions are halted once a danger is sensed. However, a cell may be prepared for the adversities from an invading virus, and it is simply commendable that the virus has the antidote to these cellular strategies as well. The HSV viral proteins are capable of limiting the use of the transcriptional and translational tools for the cell itself, so that its own transcription and translation pathways remain unhindered. HSV prefers to constrain any self-destruction process of the cell—be it autophagy in the lysosome or apoptosis by the mitochondria, so that it can continue to parasitize the cell for its own survival. This review gives a detailed account of the significance of compartmentalization during HSV pathogenesis. It also highlights the undiscovered areas in the HSV cell biology research which demand attention for devising improved therapeutics against the infection.
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Affiliation(s)
- Anwesha Banerjee
- Division of Virology, Indian Council of Medical Research-National AIDS Research Institute, Pune, India
| | - Smita Kulkarni
- Division of Virology, Indian Council of Medical Research-National AIDS Research Institute, Pune, India
| | - Anupam Mukherjee
- Division of Virology, Indian Council of Medical Research-National AIDS Research Institute, Pune, India
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6
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Dynamin-Like Protein B of Dictyostelium Contributes to Cytokinesis Cooperatively with Other Dynamins. Cells 2019; 8:cells8080781. [PMID: 31357517 PMCID: PMC6721605 DOI: 10.3390/cells8080781] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 07/19/2019] [Accepted: 07/25/2019] [Indexed: 01/31/2023] Open
Abstract
Dynamin is a large GTPase responsible for diverse cellular processes, such as endocytosis, division of organelles, and cytokinesis. The social amoebozoan, Dictyostelium discoideum, has five dynamin-like proteins: dymA, dymB, dlpA, dlpB, and dlpC. DymA, dlpA, or dlpB-deficient cells exhibited defects in cytokinesis. DlpA and dlpB were found to colocalize at cleavage furrows from the early phase, and dymA localized at the intercellular bridge connecting the two daughter cells, indicating that these dynamins contribute to cytokinesis at distinct dividing stages. Total internal reflection fluorescence microscopy revealed that dlpA and dlpB colocalized at individual dots at the furrow cortex. However, dlpA and dlpB did not colocalize with clathrin, suggesting that they are not involved in clathrin-mediated endocytosis. The fact that dlpA did not localize at the furrow in dlpB null cells and vice versa, as well as other several lines of evidence, suggests that hetero-oligomerization of dlpA and dlpB is required for them to bind to the furrow. The hetero-oligomers directly or indirectly associate with actin filaments, stabilizing them in the contractile rings. Interestingly, dlpA, but not dlpB, accumulated at the phagocytic cups independently of dlpB. Our results suggest that the hetero-oligomers of dlpA and dlpB contribute to cytokinesis cooperatively with dymA.
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7
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Luwor R, Morokoff AP, Amiridis S, D'Abaco G, Paradiso L, Stylli SS, Nguyen HPT, Tarleton M, Young KA, O'Brien TJ, Robinson PJ, Chircop M, McCluskey A, Jones NC. Targeting Glioma Stem Cells by Functional Inhibition of Dynamin 2: A Novel Treatment Strategy for Glioblastoma. Cancer Invest 2019; 37:144-155. [PMID: 30907150 DOI: 10.1080/07357907.2019.1582060] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Glioma stem cells (GSCs) play major roles in drug resistance, tumour maintenance and recurrence of glioblastoma. We investigated inhibition of the GTPase dynamin 2 as a therapy for glioblastoma. Glioma cell lines and patient-derived GSCs were treated with dynamin inhibitors, Dynole 34-2 and CyDyn 4-36. We studied about cell viability, and GSC neurosphere formation in vitro and orthotopic tumour growth in vivo. Dynamin inhibition reduced glioblastoma cell line viability and suppressed neurosphere formation and migration of GSCs. Tumour growth was reduced by CyDyn 4-36 treatment. Dynamin 2 inhibition therefore represents a novel approach for stem cell-directed Glioblastoma therapy.
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Affiliation(s)
- Rodney Luwor
- a Department of Surgery , The University of Melbourne, The Royal Melbourne Hospital , Parkville , Australia
| | - Andrew P Morokoff
- a Department of Surgery , The University of Melbourne, The Royal Melbourne Hospital , Parkville , Australia.,b Department of Neurosurgery , The Royal Melbourne Hospital , Parkville , Australia
| | - Stephanie Amiridis
- a Department of Surgery , The University of Melbourne, The Royal Melbourne Hospital , Parkville , Australia.,c Department of Medicine , The University of Melbourne, The Royal Melbourne Hospital , Parkville , Australia
| | - Giovanna D'Abaco
- d Melbourne School of Engineering, School of Chemical and Biomedical Engineering , The University of Melbourne , Parkville , Australia
| | - Lucia Paradiso
- a Department of Surgery , The University of Melbourne, The Royal Melbourne Hospital , Parkville , Australia
| | - Stanley S Stylli
- a Department of Surgery , The University of Melbourne, The Royal Melbourne Hospital , Parkville , Australia.,b Department of Neurosurgery , The Royal Melbourne Hospital , Parkville , Australia
| | - Hong P T Nguyen
- a Department of Surgery , The University of Melbourne, The Royal Melbourne Hospital , Parkville , Australia
| | - Mark Tarleton
- e Department of Chemistry, School of Environmental and Life Sciences , The University of Newcastle , Callaghan , Australia
| | - Kelly A Young
- e Department of Chemistry, School of Environmental and Life Sciences , The University of Newcastle , Callaghan , Australia
| | - Terence J O'Brien
- c Department of Medicine , The University of Melbourne, The Royal Melbourne Hospital , Parkville , Australia.,f Department of Neuroscience , Central Clinical School, Monash University , Melbourne , Australia.,g Department of Neurology , The Alfred Hospital , Melbourne , Australia
| | - Phillip J Robinson
- e Department of Chemistry, School of Environmental and Life Sciences , The University of Newcastle , Callaghan , Australia.,h Children's Medical Research Institute, The University of Sydney , Westmead , Australia
| | - Megan Chircop
- e Department of Chemistry, School of Environmental and Life Sciences , The University of Newcastle , Callaghan , Australia.,h Children's Medical Research Institute, The University of Sydney , Westmead , Australia
| | - Adam McCluskey
- e Department of Chemistry, School of Environmental and Life Sciences , The University of Newcastle , Callaghan , Australia
| | - Nigel C Jones
- c Department of Medicine , The University of Melbourne, The Royal Melbourne Hospital , Parkville , Australia.,f Department of Neuroscience , Central Clinical School, Monash University , Melbourne , Australia.,g Department of Neurology , The Alfred Hospital , Melbourne , Australia
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8
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Jimah JR, Hinshaw JE. Structural Insights into the Mechanism of Dynamin Superfamily Proteins. Trends Cell Biol 2019; 29:257-273. [DOI: 10.1016/j.tcb.2018.11.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 10/30/2018] [Accepted: 11/02/2018] [Indexed: 12/28/2022]
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9
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Martin C, Leyton L, Hott M, Arancibia Y, Spichiger C, McNiven MA, Court FA, Concha MI, Burgos PV, Otth C. Herpes Simplex Virus Type 1 Neuronal Infection Perturbs Golgi Apparatus Integrity through Activation of Src Tyrosine Kinase and Dyn-2 GTPase. Front Cell Infect Microbiol 2017; 7:371. [PMID: 28879169 PMCID: PMC5572415 DOI: 10.3389/fcimb.2017.00371] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Accepted: 08/02/2017] [Indexed: 01/03/2023] Open
Abstract
Herpes simplex virus type 1 (HSV-1) is a ubiquitous pathogen that establishes a latent persistent neuronal infection in humans. The pathogenic effects of repeated viral reactivation in infected neurons are still unknown. Several studies have reported that during HSV-1 epithelial infection, the virus could modulate diverse cell signaling pathways remodeling the Golgi apparatus (GA) membranes, but the molecular mechanisms implicated, and the functional consequences to neurons is currently unknown. Here we report that infection of primary neuronal cultures with HSV-1 triggers Src tyrosine kinase activation and subsequent phosphorylation of Dynamin 2 GTPase, two players with a role in GA integrity maintenance. Immunofluorescence analyses showed that HSV-1 productive neuronal infection caused a scattered and fragmented distribution of the GA through the cytoplasm, contrasting with the uniform perinuclear distribution pattern observed in control cells. In addition, transmission electron microscopy revealed swollen cisternae and disorganized stacks in HSV-1 infected neurons compared to control cells. Interestingly, PP2, a selective inhibitor for Src-family kinases markedly reduced these morphological alterations of the GA induced by HSV-1 infection strongly supporting the possible involvement of Src tyrosine kinase. Finally, we showed that HSV-1 tegument protein VP11/12 is necessary but not sufficient to induce Dyn2 phosphorylation. Altogether, these results show that HSV-1 neuronal infection triggers activation of Src tyrosine kinase, phosphorylation of Dynamin 2 GTPase, and perturbation of GA integrity. These findings suggest a possible neuropathogenic mechanism triggered by HSV-1 infection, which could involve dysfunction of the secretory system in neurons and central nervous system.
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Affiliation(s)
- Carolina Martin
- Faculty of Medicine, Institute of Clinical Microbiology, Universidad Austral de ChileValdivia, Chile
| | - Luis Leyton
- Faculty of Medicine, Institute of Clinical Microbiology, Universidad Austral de ChileValdivia, Chile
| | - Melissa Hott
- Faculty of Medicine, Institute of Clinical Microbiology, Universidad Austral de ChileValdivia, Chile
| | - Yennyfer Arancibia
- Faculty of Medicine, Institute of Clinical Microbiology, Universidad Austral de ChileValdivia, Chile
| | - Carlos Spichiger
- Faculty of Medicine, Institute of Clinical Microbiology, Universidad Austral de ChileValdivia, Chile
| | - Mark A McNiven
- Department of Biochemistry and Molecular Biology and the Center for Basic Research in Digestive Diseases, Mayo ClinicRochester, MN, United States
| | - Felipe A Court
- Center for Integrative Biology, Faculty of Sciences, Universidad MayorSantiago, Chile
| | - Margarita I Concha
- Faculty of Sciences, Institute of Biochemistry and Microbiology, Universidad Austral de ChileValdivia, Chile
| | - Patricia V Burgos
- Faculty of Medicine, Institute of Physiology, Universidad Austral de ChileValdivia, Chile.,Facultad de Ciencia y Facultad de Medicina, Centro de Biología Celular y Biomedicina, Universidad San SebastiánSantiago, Chile.,Centro Interdisciplinario de Estudios del Sistema Nervioso (CISNe), Universidad Austral de ChileValdivia, Chile
| | - Carola Otth
- Faculty of Medicine, Institute of Clinical Microbiology, Universidad Austral de ChileValdivia, Chile.,Centro Interdisciplinario de Estudios del Sistema Nervioso (CISNe), Universidad Austral de ChileValdivia, Chile
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10
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Liu X, Rothe K, Yen R, Fruhstorfer C, Maetzig T, Chen M, Forrest DL, Humphries RK, Jiang X. A novel AHI-1-BCR-ABL-DNM2 complex regulates leukemic properties of primitive CML cells through enhanced cellular endocytosis and ROS-mediated autophagy. Leukemia 2017; 31:2376-2387. [PMID: 28366933 PMCID: PMC5668499 DOI: 10.1038/leu.2017.108] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2016] [Revised: 03/17/2017] [Accepted: 03/22/2017] [Indexed: 02/07/2023]
Abstract
Tyrosine kinase inhibitor (TKI) therapies induce clinical remission with remarkable effects on chronic myeloid leukemia (CML). However, very few TKIs completely eradicate the leukemic clone and persistence of leukemic stem cells (LSCs) remains challenging, warranting new, distinct targets for improved treatments. We demonstrated that the scaffold protein AHI-1 is highly deregulated in LSCs and interacts with multiple proteins, including Dynamin-2 (DNM2), to mediate TKI-resistance of LSCs. We have now demonstrated that the SH3 domain of AHI-1 and the proline rich domain of DNM2 are mainly responsible for this interaction. DNM2 expression was significantly increased in CML stem/progenitor cells; knockdown of DNM2 greatly impaired their survival and sensitized them to TKI treatments. Importantly, a new AHI-1-BCR-ABL-DNM2 protein complex was uncovered, which regulates leukemic properties of these cells through a unique mechanism of cellular endocytosis and ROS-mediated autophagy. Thus, targeting this complex may facilitate eradication of LSCs for curative therapies.
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Affiliation(s)
- X Liu
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada.,Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - K Rothe
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada.,Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
| | - R Yen
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada.,Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - C Fruhstorfer
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada
| | - T Maetzig
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada
| | - M Chen
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada
| | - D L Forrest
- Department of Medicine, University of British Columbia, Vancouver, BC, Canada.,Leukemia/BMT Program of British Columbia, Vancouver, BC, Canada
| | - R K Humphries
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada.,Department of Medicine, University of British Columbia, Vancouver, BC, Canada
| | - X Jiang
- Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC, Canada.,Department of Medicine, University of British Columbia, Vancouver, BC, Canada.,Department of Medical Genetics, University of British Columbia, Vancouver, BC, Canada
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11
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Redgrove KA, Bernstein IR, Pye VJ, Mihalas BP, Sutherland JM, Nixon B, McCluskey A, Robinson PJ, Holt JE, McLaughlin EA. Dynamin 2 is essential for mammalian spermatogenesis. Sci Rep 2016; 6:35084. [PMID: 27725702 PMCID: PMC5057128 DOI: 10.1038/srep35084] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 09/26/2016] [Indexed: 11/09/2022] Open
Abstract
The dynamin family of proteins play important regulatory roles in membrane remodelling and endocytosis, especially within brain and neuronal tissues. In the context of reproduction, dynamin 1 (DNM1) and dynamin 2 (DNM2) have recently been shown to act as key mediators of sperm acrosome formation and function. However, little is known about the roles that these proteins play in the developing testicular germ cells. In this study, we employed a DNM2 germ cell-specific knockout model to investigate the role of DNM2 in spermatogenesis. We demonstrate that ablation of DNM2 in early spermatogenesis results in germ cell arrest during prophase I of meiosis, subsequent loss of all post-meiotic germ cells and concomitant sterility. These effects become exacerbated with age, and ultimately result in the demise of the spermatogonial stem cells and a Sertoli cell only phenotype. We also demonstrate that DNM2 activity may be temporally regulated by phosphorylation of DNM2 via the kinase CDK1 in spermatogonia, and dephosphorylation by phosphatase PPP3CA during meiotic and post-meiotic spermatogenesis.
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Affiliation(s)
- Kate A Redgrove
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.,PRC in Chemical Biology, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Ilana R Bernstein
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.,PRC in Chemical Biology, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Victoria J Pye
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.,PRC in Chemical Biology, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Bettina P Mihalas
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Jessie M Sutherland
- School of Biomedical Sciences &Pharmacy, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Brett Nixon
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.,PRC in Chemical Biology, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Adam McCluskey
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.,PRC in Chemical Biology, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Phillip J Robinson
- Cell Signalling Unit, Children's Medical Research Institute, University of Sydney, Sydney, NSW 2145, Australia
| | - Janet E Holt
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.,PRC in Chemical Biology, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Eileen A McLaughlin
- School of Environmental and Life Sciences, University of Newcastle, Callaghan, NSW 2308, Australia.,PRC in Chemical Biology, University of Newcastle, Callaghan, NSW 2308, Australia.,School of Biological Sciences, University of Auckland, Auckland 1010, New Zealand
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12
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Wang J, Liu M, Chen L, Chan THM, Jiang L, Yuan YF, Guan XY. Overexpression of N-terminal kinase like gene promotes tumorigenicity of hepatocellular carcinoma by regulating cell cycle progression and cell motility. Oncotarget 2015; 6:1618-30. [PMID: 25575811 PMCID: PMC4359319 DOI: 10.18632/oncotarget.2730] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 11/08/2014] [Indexed: 11/25/2022] Open
Abstract
Amplification and overexpression of CHD1L is one of the most frequent genetic alterations in hepatocellular carcinoma (HCC). Here we found that one of CHD1L downstream targets, NTKL, was frequently upregulated in HCC, which was significantly correlated with vascular invasion (P = 0.012) and poor prognosis (P = 0.050) of HCC. ChIP assay demonstrated the binding of CHD1L to the promoter region of NTKL. QRT-PCR study showed that the expression of NTKL positively correlated with CHD1L expression in both clinical samples and cell lines. Functional study found that NTKL had strong oncogenic roles, including increased cell growth, colony formation in soft agar, and tumor formation in nude mice. Further study found that NTKL could promote G1/S transition by decreasing P53 and increasing CyclinD1 expressions. NTKL overexpression could accelerate the mitotic exit and chromosome segregation, which led to the cytokinesis failure and subsequently induced apoptosis. NTKL also regulated cell motility by facilitating philopodia and lamellipodia formation through regulating F-actin reorganization and the phosphorylation of small GTPase Rac1/cdc42. Using co-IP and mass spectrometry approach, we identified the large GTPase dynamin2 as an interacting protein of NTKL, which might be responsible for the phenotype alterations caused by NTKL overexpression, such as cytokinesis failure, increased cell motility and abnormal of cell division.
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Affiliation(s)
- Jian Wang
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China.,Center for Cancer Research, The University of Hong Kong, Hong Kong, China
| | - Ming Liu
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China.,Center for Cancer Research, The University of Hong Kong, Hong Kong, China
| | - Leilei Chen
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
| | - Tim Hon Man Chan
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
| | - Lingxi Jiang
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China
| | - Yun-Fei Yuan
- State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Xin-Yuan Guan
- Departments of Clinical Oncology, The University of Hong Kong, Hong Kong, China.,State Key Laboratory for Liver Research, The University of Hong Kong, Hong Kong, China.,Center for Cancer Research, The University of Hong Kong, Hong Kong, China.,State Key Laboratory of Oncology in Southern China, Sun Yat-sen University Cancer Center, Guangzhou, China
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13
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Yu C, Guo J, Liu Y, Jia J, Jia R, Fan M. Oral squamous cancer cell exploits hnRNP A1 to regulate cell cycle and proliferation. J Cell Physiol 2015; 230:2252-61. [PMID: 25752295 DOI: 10.1002/jcp.24956] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Accepted: 02/05/2015] [Indexed: 01/08/2023]
Abstract
Oral squamous cell carcinoma (OSCC) is a common human malignant tumor with high mortality. So far, the molecular pathogenesis of OSCC remains largely unclear. Heterogeneous nuclear ribonucleoprotein (hnRNP) A1 is an important multi-function splicing factor and closely related to tumorigenesis. hnRNP A1 is overexpressed in various tumors, and promotes aerobic glycolysis and elongation of telomere, but the function of hnRNP A1 in cell cycle and proliferation remains unclear. We found that hnRNP A1 was overexpressed in OSCC tissues, and was required for the growth of OSCC cells. Moreover, hnRNP A1 was highly expressed in the G2/M cell cycle phase. Knockdown of hnRNP A1 induced G2/M arrest. DNA microarray assay result showed that hnRNP A1 regulated the expression of a number of target genes associated with G2/M phase. Moreover, hnRNP A1 controlled the alternative splicing of CDK2 exon 5. These findings suggested that hnRNP A1 plays key roles in the regulation of cell cycle progression and pathogenesis of OSCC.
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Affiliation(s)
- Cheng Yu
- Hubei-MOST KLOS & KLOBME, School & Hospital of Stomatology, Wuhan University, Wuhan, PR China
| | - Jihua Guo
- Hubei-MOST KLOS & KLOBME, School & Hospital of Stomatology, Wuhan University, Wuhan, PR China
| | - Yu Liu
- College of Life Sciences, Wuhan University, Wuhan, PR China
| | - Jun Jia
- Hubei-MOST KLOS & KLOBME, School & Hospital of Stomatology, Wuhan University, Wuhan, PR China
| | - Rong Jia
- Hubei-MOST KLOS & KLOBME, School & Hospital of Stomatology, Wuhan University, Wuhan, PR China
| | - Mingwen Fan
- Hubei-MOST KLOS & KLOBME, School & Hospital of Stomatology, Wuhan University, Wuhan, PR China
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14
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Calabrese B, Halpain S. Differential targeting of dynamin-1 and dynamin-3 to nerve terminals during chronic suppression of neuronal activity. Mol Cell Neurosci 2015; 68:36-45. [PMID: 25827095 DOI: 10.1016/j.mcn.2015.03.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 03/17/2015] [Accepted: 03/24/2015] [Indexed: 01/14/2023] Open
Abstract
Neurons express three closely related dynamin genes. Dynamin 1 has long been implicated in the regulation of synaptic vesicle recycling in nerve terminals, and dynamins 2 and 3 were more recently shown also to contribute to synaptic vesicle recycling in specific and distinguishable ways. In cultured hippocampal neurons we found that chronic suppression of spontaneous network activity differentially regulated the targeting of endogenous dynamins 1 and 3 to nerve terminals, while dynamin 2 was unaffected. Specifically, when neural activity was chronically silenced for 1-2weeks by tetrodotoxin (TTX), the clustering of dynamin 1 at nerve terminals was reduced, while the clustering of dynamin 3 significantly increased. Moreover, dynamin 3 clustering was induced within hours by the sustained blockade of AMPA receptors, suggesting that AMPA receptors may function to prevent Dyn3 accumulation within nerve terminals. Clustering of dynamin 3 was induced by an antagonist of the calcium-dependent protein phosphatase calcineurin, but was not dependent upon intact actin filaments. TTX-induced clustering of Dyn3 occurred with a markedly slower time-course than the previously described clustering of synapsin 1. Potassium-induced depolarization rapidly de-clustered dynamin 3 from nerve terminals within minutes. These results, which have implications for homeostatic synapse restructuring, indicate that the three dynamins have evolved different regulatory mechanisms for trafficking to and from nerve terminals in response to changes in neural activity.
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Affiliation(s)
- Barbara Calabrese
- Division of Biological Sciences, University of California San Diego, La Jolla, CA, United States; Sanford Consortium for Regenerative Medicine, University of California San Diego, La Jolla, CA, United States.
| | - Shelley Halpain
- Division of Biological Sciences, University of California San Diego, La Jolla, CA, United States; Sanford Consortium for Regenerative Medicine, University of California San Diego, La Jolla, CA, United States.
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15
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Reinecke JB, Katafiasz D, Naslavsky N, Caplan S. Novel functions for the endocytic regulatory proteins MICAL-L1 and EHD1 in mitosis. Traffic 2014; 16:48-67. [PMID: 25287187 DOI: 10.1111/tra.12234] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 10/02/2014] [Accepted: 10/03/2014] [Indexed: 01/01/2023]
Abstract
During interphase, recycling endosomes mediate the transport of internalized cargo back to the plasma membrane. However, in mitotic cells, recycling endosomes are essential for the completion of cytokinesis, the last phase of mitosis that promotes the physical separation the two daughter cells. Despite recent advances, our understanding of the molecular determinants that regulate recycling endosome dynamics during cytokinesis remains incomplete. We have previously demonstrated that Molecule Interacting with CasL Like-1 (MICAL-L1) and C-terminal Eps15 Homology Domain protein 1 (EHD1) coordinately regulate receptor transport from tubular recycling endosomes during interphase. However, their potential roles in controlling cytokinesis had not been addressed. In this study, we show that MICAL-L1 and EHD1 regulate mitosis. Depletion of either protein resulted in increased numbers of bi-nucleated cells. We provide evidence that bi-nucleation in MICAL-L1- and EHD1-depleted cells is a consequence of impaired recycling endosome transport during late cytokinesis. However, depletion of MICAL-L1, but not EHD1, resulted in aberrant chromosome alignment and lagging chromosomes, suggesting an EHD1-independent function for MICAL-L1 earlier in mitosis. Moreover, we provide evidence that MICAL-L1 and EHD1 differentially influence microtubule dynamics during early and late mitosis. Collectively, our new data suggest several unanticipated roles for MICAL-L1 and EHD1 during the cell cycle.
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Affiliation(s)
- James B Reinecke
- Department of Biochemistry and Molecular Biology and Fred and Pamela Buffet Cancer Research Center, University of Nebraska Medical Center, Omaha, NE, USA
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16
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Wang QC, Liu J, Wang ZB, Zhang Y, Duan X, Cui XS, Kim NH, Sun SC. Dynamin 2 regulates actin-mediated spindle migration in mouse oocytes. Biol Cell 2014; 106:193-202. [DOI: 10.1111/boc.201400007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 04/09/2014] [Indexed: 02/01/2023]
Affiliation(s)
- Qiao-Chu Wang
- College of Animal Science and Technology; Nanjing Agricultural University; Nanjing 210095 China
| | - Jun Liu
- College of Animal Science and Technology; Nanjing Agricultural University; Nanjing 210095 China
| | - Zhen-Bo Wang
- State Key Laboratory of Reproductive Biology; Institute of Zoology; Chinese Academy of Sciences; Beijing 100101 China
| | - Yu Zhang
- College of Animal Science and Technology; Nanjing Agricultural University; Nanjing 210095 China
| | - Xing Duan
- College of Animal Science and Technology; Nanjing Agricultural University; Nanjing 210095 China
| | - Xiang-Shun Cui
- Department of Animal Sciences; Chungbuk National University; Cheongju Chungbuk 361-763 Korea
| | - Nam-Hyung Kim
- Department of Animal Sciences; Chungbuk National University; Cheongju Chungbuk 361-763 Korea
| | - Shao-Chen Sun
- College of Animal Science and Technology; Nanjing Agricultural University; Nanjing 210095 China
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17
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González-Jamett AM, Momboisse F, Haro-Acuña V, Bevilacqua JA, Caviedes P, Cárdenas AM. Dynamin-2 function and dysfunction along the secretory pathway. Front Endocrinol (Lausanne) 2013; 4:126. [PMID: 24065954 PMCID: PMC3776141 DOI: 10.3389/fendo.2013.00126] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 08/31/2013] [Indexed: 12/21/2022] Open
Abstract
Dynamin-2 is a ubiquitously expressed mechano-GTPase involved in different stages of the secretory pathway. Its most well-known function relates to the scission of nascent vesicles from the plasma membrane during endocytosis; however, it also participates in the formation of new vesicles from the Golgi network, vesicle trafficking, fusion processes and in the regulation of microtubule, and actin cytoskeleton dynamics. Over the last 8 years, more than 20 mutations in the dynamin-2 gene have been associated to two hereditary neuromuscular disorders: Charcot-Marie-Tooth neuropathy and centronuclear myopathy. Most of these mutations are grouped in the pleckstrin homology domain; however, there are no common mutations associated with both disorders, suggesting that they differently impact on dynamin-2 function in diverse tissues. In this review, we discuss the impact of these disease-related mutations on dynamin-2 function during vesicle trafficking and endocytotic processes.
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Affiliation(s)
- Arlek M. González-Jamett
- Facultad de Ciencias, Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
| | - Fanny Momboisse
- Facultad de Ciencias, Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
| | - Valentina Haro-Acuña
- Facultad de Ciencias, Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
| | - Jorge A. Bevilacqua
- Programa de Anatomía y Biología del Desarrollo, ICBM, Facultad de Medicina, Departamento de Neurología y Neurocirugía, Hospital Clínico Universidad de Chile, Universidad de Chile, Santiago, Chile
| | - Pablo Caviedes
- Programa de Farmacología Molecular y Clínica, ICBM, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Ana María Cárdenas
- Facultad de Ciencias, Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
- *Correspondence: Ana María Cárdenas, Facultad de Ciencias, Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Gran Bretaña 1111, Playa Ancha 2360102, Valparaíso, Chile e-mail:
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18
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Strack S, Wilson TJ, Cribbs JT. Cyclin-dependent kinases regulate splice-specific targeting of dynamin-related protein 1 to microtubules. ACTA ACUST UNITED AC 2013; 201:1037-51. [PMID: 23798729 PMCID: PMC3691453 DOI: 10.1083/jcb.201210045] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The splice isoform Drp1-x01 promotes mitochondrial fission and is regulated by Cdk phosphorylation-dependent changes in microtubule association. Fission and fusion reactions determine mitochondrial morphology and function. Dynamin-related protein 1 (Drp1) is a guanosine triphosphate–hydrolyzing mechanoenzyme important for mitochondrial fission and programmed cell death. Drp1 is subject to alternative splicing of three exons with previously unknown functional significance. Here, we report that splice variants including the third but excluding the second alternative exon (x01) localized to and copurified with microtubule bundles as dynamic polymers that resemble fission complexes on mitochondria. A major isoform in immune cells, Drp1-x01 required oligomeric assembly and Arg residues in alternative exon 3 for microtubule targeting. Drp1-x01 stabilized and bundled microtubules and attenuated staurosporine-induced mitochondrial fragmentation and apoptosis. Phosphorylation of a conserved Ser residue adjacent to the microtubule-binding exon released Drp1-x01 from microtubules and promoted mitochondrial fragmentation in a splice form–specific manner. Phosphorylation by Cdk1 contributed to dissociation of Drp1-x01 from mitotic microtubules, whereas Cdk5-mediated phosphorylation modulated Drp1-x01 targeting to interphase microtubules. Thus, alternative splicing generates a latent, cytoskeletal pool of Drp1 that is selectively mobilized by cyclin-dependent kinase signaling.
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Affiliation(s)
- Stefan Strack
- Department of Pharmacology, University of Iowa, Iowa City, IA 52246, USA.
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19
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Masud Rana AYK, Tsujioka M, Miyagishima S, Ueda M, Yumura S. Dynamin contributes to cytokinesis by stabilizing actin filaments in the contractile ring. Genes Cells 2013; 18:621-35. [PMID: 23679940 DOI: 10.1111/gtc.12060] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Accepted: 04/01/2013] [Indexed: 02/03/2023]
Abstract
Dynamin has been proposed to play an important role in cytokinesis, although the nature of its contribution has remained unclear. Dictyostelium discoideum has five dynamin-like proteins: DymA, DymB, DlpA, DlpB and DlpC. Cells mutant for dymA, dlpA or dlpB presented defects in cytokinesis that resulted in multinucleation when the cells were cultured in suspension. However, the cells could divide normally when attached to the substratum; this latter process depends on traction-mediated cytokinesis B. A dynamin GTPase inhibitor also blocked cytokinesis in suspension, suggesting an important role for dynamin in cytokinesis A, which requires a contractile ring powered by myosin II. Myosin II did not properly localize to the cleavage furrow in dynamin mutant cells, and the furrow shape was distorted. DymA and DlpA were associated with actin filaments at the furrow. Fluorescence recovery after photobleaching and a DNase I binding assay showed that actin filaments in the contractile ring were significantly fragmented in mutant cells. Dynamin is therefore involved in the stabilization of actin filaments in the furrow, which, in turn, maintain proper myosin II organization. We conclude that the lack of these dynamins disrupts proper actomyosin organization and thereby disables cytokinesis A.
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Affiliation(s)
- A Y K Masud Rana
- Department of Functional Molecular Biology, Graduate School of Medicine, Yamaguchi University, Japan
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20
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Faelber K, Held M, Gao S, Posor Y, Haucke V, Noé F, Daumke O. Structural insights into dynamin-mediated membrane fission. Structure 2013; 20:1621-8. [PMID: 23063009 DOI: 10.1016/j.str.2012.08.028] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 08/20/2012] [Accepted: 08/31/2012] [Indexed: 12/31/2022]
Abstract
Dynamin is a multidomain mechanochemical guanine triphosphatase that catalyzes membrane scission, most notably of clathrin-coated endocytic vesicles. A number of recent publications have provided structural and mechanistic insights into the formation of helical dynamin filaments assembled by dynamic interactions of multiple domains within dynamin. As a prerequisite for membrane scission, this oligomer undergoes nucleotide-triggered large scale dynamic rearrangements. Here, we review these structural findings and discuss how the architecture of dynamin is poised for the assembly into right-handed helical filaments. Based on these data, we propose a structure-based model for dynamin-mediated scission of membranes.
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Affiliation(s)
- Katja Faelber
- Max-Delbrück-Centrum for Molecular Medicine, Crystallography, Robert-Rössle-Strasse 10, 13125 Berlin, Germany.
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21
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Sadowski Ł, Jastrzębski K, Kalaidzidis Y, Heldin CH, Hellberg C, Miaczynska M. Dynamin inhibitors impair endocytosis and mitogenic signaling of PDGF. Traffic 2013; 14:725-36. [PMID: 23425318 PMCID: PMC3712465 DOI: 10.1111/tra.12061] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Revised: 02/16/2013] [Accepted: 02/21/2013] [Indexed: 12/12/2022]
Abstract
Platelet-derived growth factor (PDGF) isoforms regulate cell proliferation, migration and differentiation both in embryonic development and adult tissue remodeling. At the cellular level, growth-factor signaling is often modulated by endocytosis. Despite important functions of PDGF, its endocytosis remains poorly studied, mainly for lack of tools to track internalized ligand by microscopy. Here, we developed such a tool and quantitatively analyzed internalization and endosomal trafficking of PDGF-BB in human fibroblasts. We further show that PDGF can be internalized in the presence of dynamin inhibitors, arguing that both dynamin-dependent and dynamin-independent pathways can mediate PDGF uptake. Although these routes operate with somewhat different kinetics, they both ultimately lead to lysosomal degradation of PDGF. Although acute inhibition of dynamin activity only moderately affects PDGF endocytosis, it specifically decreases downstream signaling of PDGF via signal transducer and activator of transcription 3 (STAT3). This correlates with reduced expression of MYC and impaired cell entry into S-phase, indicating that dynamin activity is required for PDGF-induced mitogenesis. Our data support a general view that the components governing endocytic trafficking may selectively regulate certain signaling effectors activated by a growth factor.
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Affiliation(s)
- Łukasz Sadowski
- Laboratory of Cell Biology, International Institute of Molecular and Cell Biology, Warsaw, Poland
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22
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Faelber K, Gao S, Held M, Posor Y, Haucke V, Noé F, Daumke O. Oligomerization of dynamin superfamily proteins in health and disease. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2013; 117:411-43. [PMID: 23663977 DOI: 10.1016/b978-0-12-386931-9.00015-5] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Proteins of the dynamin superfamily are mechanochemical GTPases, which mediate nucleotide-dependent membrane remodeling events. The founding member dynamin is recruited to the neck of clathrin-coated endocytic vesicles where it oligomerizes into helical filaments. Nucleotide-hydrolysis-induced conformational changes in the oligomer catalyze scission of the vesicle neck. Here, we review recent insights into structure, function, and oligomerization of dynamin superfamily proteins and their roles in human diseases. We describe in detail the molecular mechanisms how dynamin oligomerizes at membranes and introduce a model how oligomerization is linked to membrane fission. Finally, we discuss molecular mechanisms how mutations in dynamin could lead to the congenital diseases, Centronuclear Myopathy and Charcot-Marie Tooth disease.
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Affiliation(s)
- Katja Faelber
- Max-Delbrück-Centrum for Molecular Medicine, Crystallography, Berlin, Germany
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23
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Menon M, Schafer DA. Dynamin: expanding its scope to the cytoskeleton. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2013; 302:187-219. [PMID: 23351711 DOI: 10.1016/b978-0-12-407699-0.00003-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The large GTPase dynamin is well known for its actions on budded cellular membranes to generate vesicles, most often, clathrin-coated endocytic vesicles. The scope of cellular processes in which dynamin-mediated vesicle formation occurs, has expanded to include secretory vesicle formation at the Golgi, from other endosomes and nonclathrin structures, such as caveolae, as well as membrane remodeling during exocytosis and vesicle fusion. An intriguing new facet of dynamin's sphere of influence is the cytoskeleton. Cytoskeletal filament networks maintain cell shape, provide cell movement, execute cell division and orchestrate vesicle trafficking. Recent evidence supports the hypothesis that dynamin influences actin filaments and microtubules via mechanisms that are independent of its membrane-remodeling activities. This chapter discusses this emerging evidence and considers possible mechanisms of action.
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Affiliation(s)
- Manisha Menon
- Department of Biology, University of Virginia, Charlottesville, VA, USA
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24
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Lauwaet T, Smith AJ, Reiner DS, Romijn EP, Wong CCL, Davids BJ, Shah SA, Yates JR, Gillin FD. Mining the Giardia genome and proteome for conserved and unique basal body proteins. Int J Parasitol 2011; 41:1079-92. [PMID: 21723868 DOI: 10.1016/j.ijpara.2011.06.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 05/25/2011] [Accepted: 06/01/2011] [Indexed: 12/27/2022]
Abstract
Giardia lamblia is a flagellated protozoan parasite and a major cause of diarrhoea in humans. Its microtubular cytoskeleton mediates trophozoite motility, attachment and cytokinesis, and is characterised by an attachment disk and eight flagella that are each nucleated in a basal body. To date, only 10 giardial basal body proteins have been identified, including universal signalling proteins that are important for regulating mitosis or differentiation. In this study, we have exploited bioinformatics and proteomic approaches to identify new Giardia basal body proteins and confocal microscopy to confirm their localisation in interphase trophozoites. This approach identified 75 homologs of conserved basal body proteins in the genome including 65 not previously known to be associated with Giardia basal bodies. Thirteen proteins were confirmed to co-localise with centrin to the Giardia basal bodies. We also demonstrate that most basal body proteins localise to additional cytoskeletal structures in interphase trophozoites. This might help to explain the roles of the four pairs of flagella and Giardia-specific organelles in motility and differentiation. A deeper understanding of the composition of the Giardia basal bodies will contribute insights into the complex signalling pathways that regulate its unique cytoskeleton and the biological divergence of these conserved organelles.
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Affiliation(s)
- Tineke Lauwaet
- Department of Pathology, University of California San Diego, San Diego, CA 92103, USA.
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