1
|
Clavier A, Rincheval-Arnold A, Baillet A, Mignotte B, Guénal I. Two different specific JNK activators are required to trigger apoptosis or compensatory proliferation in response to Rbf1 in Drosophila. Cell Cycle 2016; 15:283-94. [PMID: 26825229 DOI: 10.1080/15384101.2015.1100776] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The Jun Kinase (JNK) signaling pathway responds to diverse stimuli by appropriate and specific cellular responses such as apoptosis, differentiation or proliferation. The mechanisms that mediate this specificity remain largely unknown. The core of this signaling pathway, composed of a JNK protein and a JNK kinase (JNKK), can be activated by various putative JNKK kinases (JNKKK) which are themselves downstream of different adaptor proteins. A proposed hypothesis is that the JNK pathway specific response lies in the combination of a JNKKK and an adaptor protein upstream of the JNKK. We previously showed that the Drosophila homolog of pRb (Rbf1) and a mutant form of Rbf1 (Rbf1(D253A)) have JNK-dependent pro-apoptotic properties. Rbf1(D253A) is also able to induce a JNK-dependent abnormal proliferation. Here, we show that Rbf1-induced apoptosis triggers proliferation which depends on the JNK pathway activation. Taking advantage of these phenotypes, we investigated the JNK signaling involved in either Rbf1-induced apoptosis or in proliferation in response to Rbf1-induced apoptosis. We demonstrated that 2 different JNK pathways involving different adaptor proteins and kinases are involved in Rbf1-apoptosis (i.e. Rac1-dTak1-dMekk1-JNK pathway) and in proliferation in response to Rbf1-induced apoptosis (i.e., dTRAF1-Slipper-JNK pathway). Using a transient induction of rbf1, we show that Rbf1-induced apoptosis activates a compensatory proliferation mechanism which also depends on Slipper and dTRAF1. Thus, these 2 proteins seem to be key players of compensatory proliferation in Drosophila.
Collapse
Affiliation(s)
- Amandine Clavier
- a Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire , EA4589 , Montigny-le-Bretonneux ; France.,b Ecole Pratique des Hautes Etudes, Laboratoire de Génétique Moléculaire et Physiologique , Montigny-le-Bretonneux , France
| | - Aurore Rincheval-Arnold
- a Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire , EA4589 , Montigny-le-Bretonneux ; France
| | - Adrienne Baillet
- a Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire , EA4589 , Montigny-le-Bretonneux ; France.,b Ecole Pratique des Hautes Etudes, Laboratoire de Génétique Moléculaire et Physiologique , Montigny-le-Bretonneux , France
| | - Bernard Mignotte
- a Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire , EA4589 , Montigny-le-Bretonneux ; France.,b Ecole Pratique des Hautes Etudes, Laboratoire de Génétique Moléculaire et Physiologique , Montigny-le-Bretonneux , France
| | - Isabelle Guénal
- a Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire , EA4589 , Montigny-le-Bretonneux ; France
| |
Collapse
|
2
|
Nakazawa M, Matsubara H, Matsushita Y, Watanabe M, Vo N, Yoshida H, Yamaguchi M, Kataoka T. The Human Bcl-2 Family Member Bcl-rambo Localizes to Mitochondria and Induces Apoptosis and Morphological Aberrations in Drosophila. PLoS One 2016; 11:e0157823. [PMID: 27348811 PMCID: PMC4922555 DOI: 10.1371/journal.pone.0157823] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 06/06/2016] [Indexed: 01/21/2023] Open
Abstract
Bcl-2 family proteins play a central role in regulating apoptosis. We previously reported that human Bcl-rambo, also termed BCL2L13, localized to mitochondria and induced apoptosis when overexpressed in human embryonic kidney 293T cells. However, the physiological function of Bcl-rambo currently remains unclear. In the present study, human Bcl-rambo was ectopically expressed in Drosophila melanogaster. Bcl-rambo mainly localized to the mitochondria of Drosophila Schneider 2 (S2) cells. The overexpression of Bcl-rambo, but not Bcl-rambo lacking a C-terminal transmembrane domain, induced apoptosis in S2 cells. Moreover, the ectopic expression of Bcl-rambo by a GAL4-UAS system induced aberrant morphological changes characterized by atrophied wing, split thorax, and rough eye phenotypes. Bcl-rambo induced the activation of effector caspases in eye imaginal discs. The rough eye phenotype induced by Bcl-rambo was partly rescued by the co-expression of p35, Diap1, and Diap2. By using this Drosophila model, we showed that human Bcl-rambo interacted genetically with Drosophila homologues of adenine nucleotide translocators and the autophagy-related 8 protein. The results of the present study demonstrated that human Bcl-rambo localized to mitochondria and at least regulated an apoptosis signaling pathway in Drosophila.
Collapse
Affiliation(s)
- Mako Nakazawa
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
| | - Hisanori Matsubara
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
| | - Yuka Matsushita
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
| | - Megumi Watanabe
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
| | - Nicole Vo
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
- The Center for Advanced Insect Research Promotion (CAIRP), Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
| | - Hideki Yoshida
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
- The Center for Advanced Insect Research Promotion (CAIRP), Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
| | - Masamitsu Yamaguchi
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
- The Center for Advanced Insect Research Promotion (CAIRP), Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
| | - Takao Kataoka
- Department of Applied Biology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
- The Center for Advanced Insect Research Promotion (CAIRP), Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606–8585, Japan
- * E-mail:
| |
Collapse
|
3
|
Clavier A, Rincheval-Arnold A, Mignotte B, Guénal I. [The comeback of mitochondria in Drosophila apoptosis]. Med Sci (Paris) 2016; 32:478-84. [PMID: 27225920 DOI: 10.1051/medsci/20163205014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The role of the mitochondrion in mammalian cell apoptosis has been established since the mid-1990s. However, the importance of this organelle in non-mammalian apoptosis has long been regarded as minor, notably because of the absence of a crucial role for cytochrome c in caspase activation. Recent results indicate that the control of caspase activation and apoptosis in Drosophila cell death occurs at the mitochondrial level. Numerous proteins that appear key for Drosophila apoptosis regulation constitutively or transiently bind to mitochondria. They participate in the cell death process at different levels such as degradation of an IAP caspase inhibitor, production of mitochondrial reactive oxygen species or stimulation of the mitochondrial fission machinery. The aim of this review is to take stock of these events that might have their counterpart in humans.
Collapse
Affiliation(s)
- Amandine Clavier
- Laboratoire de génétique et biologie cellulaire, université de Versailles Saint-Quentin-en-Yvelines, université Paris-Saclay, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France - Laboratoire de génétique moléculaire et physiologique, École pratique des hautes études, PSL research university, 78180 Montigny-le-Bretonneux, France
| | - Aurore Rincheval-Arnold
- Laboratoire de génétique et biologie cellulaire, université de Versailles Saint-Quentin-en-Yvelines, université Paris-Saclay, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France
| | - Bernard Mignotte
- Laboratoire de génétique et biologie cellulaire, université de Versailles Saint-Quentin-en-Yvelines, université Paris-Saclay, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France - Laboratoire de génétique moléculaire et physiologique, École pratique des hautes études, PSL research university, 78180 Montigny-le-Bretonneux, France
| | - Isabelle Guénal
- Laboratoire de génétique et biologie cellulaire, université de Versailles Saint-Quentin-en-Yvelines, université Paris-Saclay, 2, avenue de la Source de la Bièvre, 78180 Montigny-le-Bretonneux, France
| |
Collapse
|
4
|
Clavier A, Rincheval-Arnold A, Colin J, Mignotte B, Guénal I. Apoptosis in Drosophila: which role for mitochondria? Apoptosis 2015; 21:239-51. [DOI: 10.1007/s10495-015-1209-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
5
|
Clavier A, Ruby V, Rincheval-Arnold A, Mignotte B, Guénal I. The Drosophila retinoblastoma protein, Rbf1, induces a Debcl- and Drp1-dependent mitochondrial apoptosis. J Cell Sci 2015. [PMID: 26208635 DOI: 10.1242/jcs.169896] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
In accordance with its tumor suppressor role, the retinoblastoma protein pRb can ensure pro-apoptotic functions. Rbf1, the Drosophila homolog of Rb, also displays a pro-apoptotic activity in proliferative cells. We have previously shown that the Rbf1 pro-apoptotic activity depends on its ability to decrease the level of anti-apoptotic proteins such as the Bcl-2 family protein Buffy. Buffy often acts in an opposite manner to Debcl, the other Drosophila Bcl-2-family protein. Both proteins can localize at the mitochondrion, but the way they control apoptosis still remains unclear. Here, we demonstrate that Debcl and the pro-fission gene Drp1 are necessary downstream of Buffy to trigger a mitochondrial fragmentation during Rbf1-induced apoptosis. Interestingly, Rbf1-induced apoptosis leads to a Debcl- and Drp1-dependent reactive oxygen species production, which in turn activates the Jun Kinase pathway to trigger cell death. Moreover, we show that Debcl and Drp1 can interact and that Buffy inhibits this interaction. Notably, Debcl modulates Drp1 mitochondrial localization during apoptosis. These results provide a mechanism by which Drosophila Bcl-2 family proteins can control apoptosis, and shed light on a link between Rbf1 and mitochondrial dynamics in vivo.
Collapse
Affiliation(s)
- Amandine Clavier
- Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire, EA4589, 2 avenue de la Source de la Bièvre, Montigny-le-Bretonneux 78180, France Ecole Pratique des Hautes Etudes, Laboratoire de Génétique et Biologie Cellulaire, 2 avenue de la Source de la Bièvre, Montigny-le-Bretonneux 78180, France
| | - Vincent Ruby
- Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire, EA4589, 2 avenue de la Source de la Bièvre, Montigny-le-Bretonneux 78180, France
| | - Aurore Rincheval-Arnold
- Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire, EA4589, 2 avenue de la Source de la Bièvre, Montigny-le-Bretonneux 78180, France
| | - Bernard Mignotte
- Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire, EA4589, 2 avenue de la Source de la Bièvre, Montigny-le-Bretonneux 78180, France Ecole Pratique des Hautes Etudes, Laboratoire de Génétique et Biologie Cellulaire, 2 avenue de la Source de la Bièvre, Montigny-le-Bretonneux 78180, France
| | - Isabelle Guénal
- Université de Versailles Saint-Quentin-en-Yvelines, Laboratoire de Génétique et Biologie Cellulaire, EA4589, 2 avenue de la Source de la Bièvre, Montigny-le-Bretonneux 78180, France
| |
Collapse
|
6
|
Colin J, Garibal J, Clavier A, Szuplewski S, Risler Y, Milet C, Gaumer S, Guénal I, Mignotte B. Screening of suppressors of bax-induced cell death identifies glycerophosphate oxidase-1 as a mediator of debcl-induced apoptosis in Drosophila. Genes Cancer 2015; 6:241-253. [PMID: 26124923 PMCID: PMC4482245 DOI: 10.18632/genesandcancer.68] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Accepted: 06/06/2015] [Indexed: 01/20/2023] Open
Abstract
Members of the Bcl-2 family are key elements of the apoptotic machinery. In mammals, this multigenic family contains about twenty members, which either promote or inhibit apoptosis. We have previously shown that the mammalian pro-apoptotic Bcl-2 family member Bax is very efficient in inducing apoptosis in Drosophila, allowing the study of bax-induced cell death in a genetic animal model. We report here the results of the screening of a P[UAS]-element insertion library performed to identify gene products that modify the phenotypes induced by the expression of bax in Drosophila melanogaster. We isolated 17 putative modifiers involved in various function or process: the ubiquitin/proteasome pathway; cell growth, proliferation and death; pathfinding and cell adhesion; secretion and extracellular signaling; metabolism and oxidative stress. Most of these suppressors also inhibit debcl-induced phenotypes, suggesting that the activities of both proteins can be modulated in part by common signaling or metabolic pathways. Among these suppressors, Glycerophosphate oxidase-1 is found to participate in debcl-induced apoptosis by increasing mitochondrial reactive oxygen species accumulation.
Collapse
Affiliation(s)
- Jessie Colin
- Université Versailles St-Quentin, Laboratoire de Génétique et Biologie Cellulaire, Montigny-le-Bretonneux, France.,Ecole Pratique des Hautes Etudes, Laboratoire de Génétique Moléculaire et Physiologique, Montigny-le-Bretonneux, France
| | - Julie Garibal
- Université Versailles St-Quentin, Laboratoire de Génétique et Biologie Cellulaire, Montigny-le-Bretonneux, France.,Ecole Pratique des Hautes Etudes, Laboratoire de Génétique Moléculaire et Physiologique, Montigny-le-Bretonneux, France
| | - Amandine Clavier
- Université Versailles St-Quentin, Laboratoire de Génétique et Biologie Cellulaire, Montigny-le-Bretonneux, France.,Ecole Pratique des Hautes Etudes, Laboratoire de Génétique Moléculaire et Physiologique, Montigny-le-Bretonneux, France
| | - Sébastien Szuplewski
- Université Versailles St-Quentin, Laboratoire de Génétique et Biologie Cellulaire, Montigny-le-Bretonneux, France
| | - Yanick Risler
- Université Versailles St-Quentin, Laboratoire de Génétique et Biologie Cellulaire, Montigny-le-Bretonneux, France
| | - Cécile Milet
- Université Versailles St-Quentin, Laboratoire de Génétique et Biologie Cellulaire, Montigny-le-Bretonneux, France.,Ecole Pratique des Hautes Etudes, Laboratoire de Génétique Moléculaire et Physiologique, Montigny-le-Bretonneux, France
| | - Sébastien Gaumer
- Université Versailles St-Quentin, Laboratoire de Génétique et Biologie Cellulaire, Montigny-le-Bretonneux, France
| | - Isabelle Guénal
- Université Versailles St-Quentin, Laboratoire de Génétique et Biologie Cellulaire, Montigny-le-Bretonneux, France.,Co-senior authors
| | - Bernard Mignotte
- Université Versailles St-Quentin, Laboratoire de Génétique et Biologie Cellulaire, Montigny-le-Bretonneux, France.,Ecole Pratique des Hautes Etudes, Laboratoire de Génétique Moléculaire et Physiologique, Montigny-le-Bretonneux, France.,Co-senior authors
| |
Collapse
|
7
|
Colin J, Garibal J, Clavier A, Rincheval-Arnold A, Gaumer S, Mignotte B, Guénal I. The drosophila Bcl-2 family protein Debcl is targeted to the proteasome by the β-TrCP homologue slimb. Apoptosis 2014; 19:1444-56. [DOI: 10.1007/s10495-014-1034-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
8
|
The pro-apoptotic activity of Drosophila Rbf1 involves dE2F2-dependent downregulation of diap1 and buffy mRNA. Cell Death Dis 2014; 5:e1405. [PMID: 25188515 PMCID: PMC4540203 DOI: 10.1038/cddis.2014.372] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Revised: 07/23/2014] [Accepted: 07/28/2014] [Indexed: 11/16/2022]
Abstract
The retinoblastoma gene, rb, ensures at least its tumor suppressor function by inhibiting cell proliferation. Its role in apoptosis is more complex and less described than its role in cell cycle regulation. Rbf1, the Drosophila homolog of Rb, has been found to be pro-apoptotic in proliferative tissue. However, the way it induces apoptosis at the molecular level is still unknown. To decipher this mechanism, we induced rbf1 expression in wing proliferative tissue. We found that Rbf1-induced apoptosis depends on dE2F2/dDP heterodimer, whereas dE2F1 transcriptional activity is not required. Furthermore, we highlight that Rbf1 and dE2F2 downregulate two major anti-apoptotic genes in Drosophila: buffy, an anti-apoptotic member of Bcl-2 family and diap1, a gene encoding a caspase inhibitor. On the one hand, Rbf1/dE2F2 repress buffy at the transcriptional level, which contributes to cell death. On the other hand, Rbf1 and dE2F2 upregulate how expression. How is a RNA binding protein involved in diap1 mRNA degradation. By this way, Rbf1 downregulates diap1 at a post-transcriptional level. Moreover, we show that the dREAM complex has a part in these transcriptional regulations. Taken together, these data show that Rbf1, in cooperation with dE2F2 and some members of the dREAM complex, can downregulate the anti-apoptotic genes buffy and diap1, and thus promote cell death in a proliferative tissue.
Collapse
|
9
|
Abstract
Apoptosis is a process of programmed cell death that serves as a major mechanism for the precise regulation of cell numbers, and as a defense mechanism to remove unwanted and potentially dangerous cells. Studies in nematode, Drosophila and mammals have shown that, although regulation of the cell death machinery is somehow different from one species to another, it is controlled by homologous proteins and involves mitochondria. In mammals, activation of caspases (cysteine proteases that are the main executioners of apoptosis) is under the tight control of the Bcl-2 family proteins, named in reference to the first discovered mammalian cell death regulator. These proteins mainly act by regulating the release of caspases activators from mitochondria. Although for a long time the absence of mitochondrial changes was considered as a hallmark of apoptosis, mitochondria appear today as the central executioner of apoptosis. In this chapter, we present the current view on the mitochondrial pathway of apoptosis with a particular attention to new aspects of the regulation of the Bcl-2 proteins family control of mitochondrial membrane permeabilization: the mechanisms implicated in their mitochondrial targeting and activation during apoptosis, the function(s) of the oncosuppressive protein p53 at the mitochondria and the role of the processes of mitochondrial fusion and fission.
Collapse
|
10
|
Abstract
Mitochondria play key roles in activating apoptosis in mammalian cells. Bcl-2 family members regulate the release of proteins from the space between the mitochondrial inner and outer membrane that, once in the cytosol, activate caspase proteases that dismantle cells and signal efficient phagocytosis of cell corpses. Here we review the extensive literature on proteins released from the intermembrane space and consider genetic evidence for and against their roles in apoptosis activation. We also compare and contrast apoptosis pathways in Caenorhabditis elegans, Drosophila melanogaster, and mammals that indicate major mysteries remaining to be solved.
Collapse
Affiliation(s)
- Chunxin Wang
- Biochemistry Section, Surgical Neurology Branch, NINDS, National Institutes of Health, Bethesda, Maryland 20892, USA
| | | |
Collapse
|
11
|
Colin J, Garibal J, Mignotte B, Guénal I. The mitochondrial TOM complex modulates bax-induced apoptosis in Drosophila. Biochem Biophys Res Commun 2009; 379:939-43. [DOI: 10.1016/j.bbrc.2008.12.176] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2008] [Accepted: 12/28/2008] [Indexed: 10/21/2022]
|
12
|
Brun S, Rincheval-Arnold A, Colin J, Risler Y, Mignotte B, Guénal I. The myb-related gene stonewall induces both hyperplasia and cell death in Drosophila: rescue of fly lethality by coexpression of apoptosis inducers. Cell Death Differ 2006; 13:1752-62. [PMID: 16456582 DOI: 10.1038/sj.cdd.4401861] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
We carried out gain-of-function mutagenesis screening and identified a mutant in which GAL4 induction led to both hyperplasia and apoptosis. The gene involved was identified as stonewall (stwl), a myb-related gene involved in germ cell proliferation and differentiation during oogenesis. As observed with dmyb, the ectopic expression of stwl(UY823) inhibited endoreplication in salivary glands. We also found that stwl(UY823) overexpression, like overexpression of the wild-type gene, activated G1/S transition and apoptosis. The apoptosis triggered by stwl(UY823) expression is correlated to induction of the proapoptotic gene reaper. Finally, the death of flies induced by ectopic stwl(UY823) expression is efficiently prevented in vivo by triggering cell death in stwl(UY823)-expressing cells. Our results suggest that stwl(UY823) kills flies by causing inappropriate cell cycle entry, and that triggering the death of these overproliferating cells or slowing their proliferation restores viability.
Collapse
Affiliation(s)
- S Brun
- Laboratoire de Génétique et Biologie Cellulaire, CNRS MR 8159, Université de Versailles-St. Quentin en Yvelines, 45 avenue des Etats-Unis, F-78035 Versailles cedex, France
| | | | | | | | | | | |
Collapse
|
13
|
Tait SWG, Werner AB, de Vries E, Borst J. Mechanism of action of Drosophila Reaper in mammalian cells: Reaper globally inhibits protein synthesis and induces apoptosis independent of mitochondrial permeability. Cell Death Differ 2005; 11:800-11. [PMID: 15044965 DOI: 10.1038/sj.cdd.4401410] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Drosophila Reaper can bind inhibitor of apoptosis proteins (IAP) and thereby rescue caspases from proteasomal degradation. In insect cells, this is sufficient to induce apoptosis. Reaper can also induce apoptosis in mammalian cells, in which caspases need to be activated, usually via the mitochondrial pathway. Nevertheless, we find that Reaper efficiently induces apoptosis in mammalian cells in the absence of mitochondrial permeabilisation and cytochrome c release. Moreover, this capacity was only marginally affected by deletion of Reaper's amino-terminal IAP-binding motif. Independent of this motif, Reaper could globally suppress protein synthesis. Deletion of 20 amino acids from the carboxy-terminus of Reaper fully abrogated its potential to inhibit protein synthesis and to induce apoptosis in the absence of IAP-binding. Our findings indicate that the newly identified capacity of Reaper to suppress protein translation can operate in mammalian cells and may be key to its pro-apoptotic activity.
Collapse
Affiliation(s)
- S W G Tait
- Division of Immunology, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands
| | | | | | | |
Collapse
|
14
|
Quinn L, Coombe M, Mills K, Daish T, Colussi P, Kumar S, Richardson H. Buffy, a Drosophila Bcl-2 protein, has anti-apoptotic and cell cycle inhibitory functions. EMBO J 2003; 22:3568-79. [PMID: 12853472 PMCID: PMC165625 DOI: 10.1093/emboj/cdg355] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2003] [Revised: 05/19/2003] [Accepted: 05/23/2003] [Indexed: 11/12/2022] Open
Abstract
Bcl-2 family proteins are key regulators of apoptosis. Both pro-apoptotic and anti-apoptotic members of this family are found in mammalian cells, but only the pro-apoptotic protein Debcl has been characterized in Drosophila: Here we report that Buffy, the second Drosophila Bcl-2-like protein, is a pro-survival protein. Ablation of Buffy by RNA interference leads to ectopic apoptosis, whereas overexpression of buffy results in the inhibition of developmental programmed cell death and gamma irradiation-induced apoptosis. Buffy interacts genetically and physically with Debcl to suppress Debcl-induced cell death. Genetic interactions suggest that Buffy acts downstream of Rpr, Grim and Hid, and upstream of the apical caspase Dronc. Furthermore, overexpression of buffy inhibits ectopic cell death in diap1 (th(5)) mutants. Taken together these data suggest that Buffy can act downstream of Rpr, Grim and Hid to block caspase-dependent cell death. Overexpression of Buffy in the embryo results in inhibition of the cell cycle, consistent with a G(1)/early-S phase arrest. Our data suggest that Buffy is functionally similar to the mammalian pro-survival Bcl-2 family of proteins.
Collapse
Affiliation(s)
- Leonie Quinn
- Trescowick Research Laboratories, Peter MacCallum Cancer Institute, St Andrews Place, East Melbourne
| | | | | | | | | | | | | |
Collapse
|
15
|
Gaumer S, Guenal I, Brun S, Mignotte B. L’apoptose chez la drosophile : conservation et originalité. Med Sci (Paris) 2002. [DOI: 10.1051/medsci/20021889875] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|