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Takatsu H, Katoh Y, Ueda T, Waguri S, Murayama T, Takahashi S, Shin HW, Nakayama K. Mitosis-coupled, microtubule-dependent clustering of endosomal vesicles around centrosomes. Cell Struct Funct 2013; 38:31-41. [PMID: 23328347 DOI: 10.1247/csf.12028] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Upon cell division, not only cells themselves but also their organelles undergo drastic shape changes, although the behaviors of organelles other than the Golgi apparatus remain poorly understood. We followed the spatiotemporal changes in the localization of transferrin receptor (TfnR) and other proteins. In early mitotic phases, a population of proteins cycling through the endocytic recycling compartment (ERC) exhibits a distinct spatiotemporal change from that of Golgi proteins. In prophase/prometaphase, when the cell surface-to-volume ratio is reaching its minimum, the ERC proteins are transiently assembled around the centrated centrosome in a microtubule- and dynein-dependent manner, and soon separated polewards into two clusters concomitant with separation of duplicated centrosomes. Electron microscopic analysis revealed that endosomal vesicles containing endocytosed transferrin cluster tightly around centrosomes without fusing with one another. As cytokinesis proceeds, the clusters gradually collapse, and the ERC proteins reassemble around the furrowing equatorial region. FRAP (fluorescence recovery after photobleaching) analyses of EGFP-TfnR-expressing cells revealed minimal membrane exchange between the endosomal clusters and other cellular compartments until anaphase/telophase, when membrane traffic resumes. Our observations indicate that ERC clustering around centrosomes plays a fundamental role in restricting membrane delivery to the plasma membrane during early mitotic phases, when the cell surface-to-volume ratio reaches its minimum.
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Affiliation(s)
- Hiroyuki Takatsu
- Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
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Takahashi S, Kubo K, Waguri S, Yabashi A, Shin HW, Katoh Y, Nakayama K. Rab11 regulates exocytosis of recycling vesicles at the plasma membrane. J Cell Sci 2012; 125:4049-57. [PMID: 22685325 DOI: 10.1242/jcs.102913] [Citation(s) in RCA: 196] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Rab11 is known to associate primarily with perinuclear recycling endosomes and regulate recycling of endocytosed proteins. However, the recycling step in which Rab11 participates remains unknown. We show here that, in addition to causing tubulation of recycling endosomes, Rab11 depletion gives rise to accumulation of recycling carriers containing endocytosed transferrin and transferrin receptor beneath the plasma membrane. We also show that the carriers are transported from perinuclear recycling endosomes to the cell periphery along microtubules. Total internal reflection fluorescence microscopy of cells expressing EGFP-tagged transferrin receptor revealed that Rab11 depletion inhibits tethering and fusion of recycling carriers to the plasma membrane. Depletion of Sec15, which interacts with Rab11, or Exo70, both components of the exocyst tethering complex, leads to essentially the same phenotypes as those of Rab11 depletion. Thus, in addition to its role in recycling processes at perinuclear recycling endosomes, Rab11 is transported along microtubules to the cell periphery through association with recycling carriers, and directly regulates vesicle exocytosis at the plasma membrane in concert with the exocyst.
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Affiliation(s)
- Senye Takahashi
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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Aziridine-2,3-dicarboxylate-based cysteine cathepsin inhibitors induce cell death in Leishmania major associated with accumulation of debris in autophagy-related lysosome-like vacuoles. Antimicrob Agents Chemother 2010; 54:5028-41. [PMID: 20855728 DOI: 10.1128/aac.00327-10] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The papain-like cysteine cathepsins expressed by Leishmania play a key role in the life cycle of these parasites, turning them into attractive targets for the development of new drugs. We previously demonstrated that two compounds of a series of peptidomimetic aziridine-2,3-dicarboxylate [Azi(OBn)(2)]-based inhibitors, Boc-(S)-Leu-(R)-Pro-(S,S)-Azi(OBn)(2) (compound 13b) and Boc-(R)-Leu-(S)-Pro-(S,S)-Azi(OBn)(2) (compound 13e), reduced the growth and viability of Leishmania major and the infection rate of macrophages while not showing cytotoxicity against host cells. In the present study, we characterized the mode of action of inhibitors 13b and 13e in L. major. Both compounds targeted leishmanial cathepsin B-like cysteine cathepsin cysteine proteinase C, as shown by fluorescence proteinase activity assays and active-site labeling with biotin-tagged inhibitors. Furthermore, compounds 13b and 13e were potent inducers of cell death in promastigotes, characterized by cell shrinkage, reduction of mitochondrial transmembrane potential, and increased DNA fragmentation. Transmission electron microscopic studies revealed the enrichment of undigested debris in lysosome-like organelles participating in micro- and macroautophagy-like processes. The release of digestive enzymes into the cytoplasm after rupture of membranes of lysosome-like vacuoles resulted in the significant digestion of intracellular compartments. However, the plasma membrane integrity of compound-treated promastigotes was maintained for several hours. Taken together, our results suggest that the induction of cell death in Leishmania by cysteine cathepsin inhibitors 13b and 13e is different from mammalian apoptosis and is caused by incomplete digestion in autophagy-related lysosome-like vacuoles.
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Mitsuki M, Nara K, Yamaji T, Enomoto A, Kanno M, Yamaguchi Y, Yamada A, Waguri S, Hashimoto Y. Siglec-7 mediates nonapoptotic cell death independently of its immunoreceptor tyrosine-based inhibitory motifs in monocytic cell line U937. Glycobiology 2009; 20:395-402. [PMID: 20032046 DOI: 10.1093/glycob/cwp195] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Siglec-7, a sialic acid binding immunoglobulin-like lectin, predominantly transduces inhibitory signals through cytosolic immunoreceptor tyrosine-based inhibitory motifs (ITIMs). Here, we report that clustering of Siglec-7 with a specific F(ab')(2) elicited cell death. Interestingly, a truncated Siglec-7 lacking the cytosolic ITIM domain still induced the cell death, suggesting that the ITIMs are not essential for the death signaling. Further analyses of the death signaling revealed that an oxygen radical scavenger, N-acetyl cysteine, completely inhibited the cell death, whereas a pancaspase inhibitor did not. In addition, caspase-3 activation, DNA ladder formation, and nuclear condensation were not detected during the death process, suggesting that the cell death is nonapoptotic. To identify the critical region for the death signaling, we prepared a series of shuffling chimeras between Siglec-7 and Siglec-9, the latter of which did not transduce a death signal. The critical region was mapped to the middle of the membrane-proximal C2-set domain, which contained only six amino acid differences between Siglec-7 and Siglec-9. Point mutation analyses of each of these six amino acids revealed that four of the six amino acids were critical for the death signal. A computer-assisted 3D modeling revealed that these four amino acids were proximally located on the surface of the C2-set domain. In conclusion, Siglec-7 induces nonapoptotic cell death, the signal for which is transduced by an extracellular C2-set domain.
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Affiliation(s)
- Motoaki Mitsuki
- Glyco-chain Functions Laboratory, Supra-Biomolecule Research Group, RIKEN Frontier Research System, Saitama, Japan
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Moriwaki Y, Watanabe Y, Shinagawa T, Kai M, Miyazawa M, Okuda T, Kawashima K, Yabashi A, Waguri S, Misawa H. Primary sensory neuronal expression of SLURP-1, an endogenous nicotinic acetylcholine receptor ligand. Neurosci Res 2009; 64:403-12. [DOI: 10.1016/j.neures.2009.04.014] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Revised: 04/20/2009] [Accepted: 04/21/2009] [Indexed: 10/20/2022]
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Saitoh A, Shin HW, Yamada A, Waguri S, Nakayama K. Three homologous ArfGAPs participate in coat protein I-mediated transport. J Biol Chem 2009; 284:13948-13957. [PMID: 19299515 DOI: 10.1074/jbc.m900749200] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
ArfGAP1 is a prototype of GTPase-activating proteins for ADP-ribosylation factors (ARFs) and has been proposed to be involved in retrograde transport from the Golgi apparatus to the endoplasmic reticulum (ER) by regulating the uncoating of coat protein I (COPI)-coated vesicles. Depletion of ArfGAP1 by RNA interference, however, causes neither a discernible phenotypic change in the COPI localization nor a change in the Golgi-to-ER retrograde transport. Therefore, we also examined ArfGAP2 and ArfGAP3, closely related homologues of ArfGAP1. Cells in which ArfGAP1, ArfGAP2, and ArfGAP3 are simultaneously knocked down show an increase in the GTP-bound ARF level. Furthermore, in these cells proteins resident in or cycling through the cis-Golgi, including ERGIC-53, beta-COP, and GM130, accumulate in the ER-Golgi intermediate compartment, and Golgi-to-ER retrograde transport is blocked. The phenotypes observed in the triple ArfGAP knockdown cells are similar to those seen in beta-COP-depleted cells. Both the triple ArfGAP- and beta-COP-depleted cells accumulate characteristic vacuolar structures that are visible under electron microscope. Furthermore, COPI is concentrated at rims of the vacuolar structures in the ArfGAP-depleted cells. On the basis of these observations, we conclude that ArfGAP1, ArfGAP2, and ArfGAP3 have overlapping roles in regulating COPI function in Golgi-to-ER retrograde transport.
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Affiliation(s)
- Akina Saitoh
- Graduate School of Pharmaceutical Sciences and Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hye-Won Shin
- Graduate School of Pharmaceutical Sciences and Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan; Career-Path Promotion Unit for Young Life Scientists, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Akane Yamada
- Department of Anatomy and Histology, Fukushima Medical University, School of Medicine, Fukushima City, Fukushima 960-1295, Japan
| | - Satoshi Waguri
- Department of Anatomy and Histology, Fukushima Medical University, School of Medicine, Fukushima City, Fukushima 960-1295, Japan
| | - Kazuhisa Nakayama
- Graduate School of Pharmaceutical Sciences and Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
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Fujibayashi A, Taguchi T, Misaki R, Ohtani M, Dohmae N, Takio K, Yamada M, Gu J, Yamakami M, Fukuda M, Waguri S, Uchiyama Y, Yoshimori T, Sekiguchi K. Human RME-8 Is Involved in Membrane Trafficking through Early Endosomes. Cell Struct Funct 2008; 33:35-50. [DOI: 10.1247/csf.07045] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Akemi Fujibayashi
- Division of Protein Chemistry, Institute for Protein Research, Osaka University
| | - Tomohiko Taguchi
- Department of Biochemistry, Osaka University Graduate School of Medicine
| | - Ryo Misaki
- Department of Biochemistry, Osaka University Graduate School of Medicine
| | - Masashi Ohtani
- Division of Protein Chemistry, Institute for Protein Research, Osaka University
| | | | - Koji Takio
- Biometal Science Laboratory, RIKEN Spring-8 Center
| | - Masashi Yamada
- Division of Protein Chemistry, Institute for Protein Research, Osaka University
| | - Jianguo Gu
- Division of Regulatory Glycobiology, Institute of Molecular Biomembrane and Glycobiology, Tohoku Pharmaceutical University
| | - Megumi Yamakami
- Department of Cell Regulation, Research Institute for Microbial Diseases, Osaka University
| | - Mitsunori Fukuda
- Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University
| | - Satoshi Waguri
- Department of Anatomy and Histology, Fukushima Medical University School of Medicine
| | - Yasuo Uchiyama
- Department of Cell Biology and Neuroscience A1, Osaka University Graduate School of Medicine
| | - Tamotsu Yoshimori
- Department of Cell Regulation, Research Institute for Microbial Diseases, Osaka University
| | - Kiyotoshi Sekiguchi
- Division of Protein Chemistry, Institute for Protein Research, Osaka University
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Shin HW, Kobayashi H, Kitamura M, Waguri S, Suganuma T, Uchiyama Y, Nakayama K. Roles of ARFRP1 (ADP-ribosylation factor-related protein 1) in post-Golgi membrane trafficking. J Cell Sci 2005; 118:4039-48. [PMID: 16129887 DOI: 10.1242/jcs.02524] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
ADP-ribosylation factor (ARF)-related protein 1 (ARFRP1) is a small GTPase with significant similarity to the ARF family. However, little is known about the function of ARFRP1 in mammalian cells, although knockout mice of its gene are embryonic lethal. In the present study, we demonstrate that ARFRP1 is associated mainly with the trans-Golgi compartment and the trans-Golgi network (TGN) and is an essential regulatory factor for targeting of Arl1 and GRIP domain-containing proteins, golgin-97 and golgin-245, onto Golgi membranes. Furthermore, we show that, in concert with Arl1 and GRIP proteins, ARFRP1 is implicated in the Golgi-to-plasma membrane transport of the vesicular stomatitis virus G protein as well as in the retrograde transport of TGN38 and Shiga toxin from endosomes to the TGN.
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Affiliation(s)
- Hye-Won Shin
- Department of Physiological Chemistry, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto 606-8501, Japan
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Fombonne J, Reix S, Rasolonjanahary R, Danty E, Thirion S, Laforge-Anglade G, Bosler O, Mehlen P, Enjalbert A, Krantic S. Epidermal growth factor triggers an original, caspase-independent pituitary cell death with heterogeneous phenotype. Mol Biol Cell 2004; 15:4938-48. [PMID: 15331766 PMCID: PMC524748 DOI: 10.1091/mbc.e04-07-0601] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Programmed cell death (PCD) is physiologically involved in the regulation of cell division and differentiation. It encompasses caspase-dependent mitochondrial and nonmitochondrial pathways. Additional caspase-independent pathways have been characterized in mitochondrial PCDs but remain hypothetical in nonmitochondrial PCDs. Epidermal growth factor (EGF) has been shown to inhibit division of pituitary somato-lactotrope cells occurring in parallel with EGF-mediated differentiation of these precursors into lactotrope cells. We show here that in somato-lactotrope pituitary cell line GH4C1, EGF triggers a PCD characterized by an apoptosis-like DNA fragmentation, insensitivity to broad-range caspase inhibitors, and absence of either cytochrome c or apoptosis-inducing factor release from mitochondria. Dying cells display loose chromatin clustering and numerous cytoplasmic vacuoles, a fraction of which are autophagic, thus conferring a heterogeneous phenotype to this PCD. Moreover, overexpression of cell death inhibitor Bcl-2 prevented not only the EGF-induced PCD but also its prodifferentiation effects, thus pointing to a mechanistic relationship existing between these two phenomena. Overall, the characterized differentiation-linked cell death represents an original form of caspase-independent PCD. The mechanisms underlying this PCD involve combinatorial engagement of discrete death effectors leading to a heterogeneous death phenotype that might be evolutionary related to PCD seen during the differentiation of some unicellular organisms.
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Affiliation(s)
- Joanna Fombonne
- Interactions Cellulaires Neuroendocriniennes, Unité Mixte de Recherche 6544, Centre National de Recherche Scientifique/Université de la Méditerranée, Institut Jean Roche, Faculté de Médecine Nord, 13916 Marseille, France
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Pattingre S, Bauvy C, Codogno P. Amino acids interfere with the ERK1/2-dependent control of macroautophagy by controlling the activation of Raf-1 in human colon cancer HT-29 cells. J Biol Chem 2003; 278:16667-74. [PMID: 12609989 DOI: 10.1074/jbc.m210998200] [Citation(s) in RCA: 221] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Activation of ERK1/2 stimulates macroautophagy in the human colon cancer cell line HT-29 by favoring the phosphorylation of the Galpha-interacting protein (GAIP) in an amino acid-dependent manner (Ogier-Denis, E., Pattingre, S., El Benna, J., and Codogno, P. (2000) J. Biol. Chem. 275, 39090-39095). Here we show that ERK1/2 activation by aurintricarboxylic acid (ATA) treatment induces the phosphorylation of GAIP in an amino acid-dependent manner. Accordingly, ATA challenge increased the rate of macroautophagy, whereas epidermal growth factor did not significantly affect macroautophagy and GAIP phosphorylation status. In fact, ATA activated the ERK1/2 signaling pathway, whereas epidermal growth factor stimulated both the ERK1/2 pathway and the class I phosphoinositide 3-kinase pathway, known to decrease the rate of macroautophagy. Amino acids interfered with the ATA-induced macroautophagy by inhibiting the activation of the kinase Raf-1. The role of the Ras/Raf-1/ERK1/2 signaling pathway in the GAIP- and amino acid-dependent control of macroautophagy was confirmed in HT-29 cells expressing the Ras(G12V,T35S) mutant. Similar to the protein phosphatase 2A inhibitor okadaic acid, amino acids sustained the phosphorylation of Ser(259), which is involved in the negative regulation of Raf-1. In conclusion, these results add a novel target to the amino acid signaling-dependent control of macroautophagy in intestinal cells.
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Affiliation(s)
- Sophie Pattingre
- INSERM U504, Glycobiologie et Signalisation Cellulaire, 16, avenue Paul-Vaillant-Couturier, 94807 Villejuif Cedex, France
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