1
|
Tifoun N, De las Heras JM, Guillaume A, Bouleau S, Mignotte B, Le Floch N. Insights into the Roles of the Sideroflexins/SLC56 Family in Iron Homeostasis and Iron-Sulfur Biogenesis. Biomedicines 2021; 9:103. [PMID: 33494450 PMCID: PMC7911444 DOI: 10.3390/biomedicines9020103] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/18/2021] [Accepted: 01/19/2021] [Indexed: 01/25/2023] Open
Abstract
Sideroflexins (SLC56 family) are highly conserved multi-spanning transmembrane proteins inserted in the inner mitochondrial membrane in eukaryotes. Few data are available on their molecular function, but since their first description, they were thought to be metabolite transporters probably required for iron utilization inside the mitochondrion. Such as numerous mitochondrial transporters, sideroflexins remain poorly characterized. The prototypic member SFXN1 has been recently identified as the previously unknown mitochondrial transporter of serine. Nevertheless, pending questions on the molecular function of sideroflexins remain unsolved, especially their link with iron metabolism. Here, we review the current knowledge on sideroflexins, their presumed mitochondrial functions and the sparse-but growing-evidence linking sideroflexins to iron homeostasis and iron-sulfur cluster biogenesis. Since an imbalance in iron homeostasis can be detrimental at the cellular and organismal levels, we also investigate the relationship between sideroflexins, iron and physiological disorders. Investigating Sideroflexins' functions constitutes an emerging research field of great interest and will certainly lead to the main discoveries of mitochondrial physio-pathology.
Collapse
Affiliation(s)
- Nesrine Tifoun
- LGBC, UVSQ, Université Paris-Saclay, 78000 Versailles, France; (N.T.); (J.M.D.l.H.); (A.G.); (S.B.); (B.M.)
| | - José M. De las Heras
- LGBC, UVSQ, Université Paris-Saclay, 78000 Versailles, France; (N.T.); (J.M.D.l.H.); (A.G.); (S.B.); (B.M.)
| | - Arnaud Guillaume
- LGBC, UVSQ, Université Paris-Saclay, 78000 Versailles, France; (N.T.); (J.M.D.l.H.); (A.G.); (S.B.); (B.M.)
| | - Sylvina Bouleau
- LGBC, UVSQ, Université Paris-Saclay, 78000 Versailles, France; (N.T.); (J.M.D.l.H.); (A.G.); (S.B.); (B.M.)
| | - Bernard Mignotte
- LGBC, UVSQ, Université Paris-Saclay, 78000 Versailles, France; (N.T.); (J.M.D.l.H.); (A.G.); (S.B.); (B.M.)
- École Pratique des Hautes Études, PSL University, 75014 Paris, France
| | - Nathalie Le Floch
- LGBC, UVSQ, Université Paris-Saclay, 78000 Versailles, France; (N.T.); (J.M.D.l.H.); (A.G.); (S.B.); (B.M.)
- GCGP Department, IUT de Vélizy/Rambouillet, UVSQ, Université Paris-Saclay, 78120 Rambouillet, France
| |
Collapse
|
2
|
Abstract
Amyloid-β protein precursor (AβPP) and the microtubule-associated protein tau (MAPT) are the two key players involved in Alzheimer's disease (AD) and are associated with amyloid plaques and neurofibrillary tangles respectively, two key hallmarks of the disease. Besides vertebrate models, Drosophila models have been widely used to understand the complex events leading to AD in relation to aging. Drosophila benefits from the low redundancy of the genome which greatly simplifies the analysis of single gene disruption, sophisticated molecular genetic tools, and reduced cost compared to mammals. The aim of this review is to describe the recent advances in modeling AD using fly and to emphasize some limits of these models. Genetic studies in Drosophila have revealed some key aspects of the normal function of Appl and Tau, the fly homologues of AβPP and MAPT that may be disrupted during AD. Drosophila models have also been useful to uncover or validate several pathological pathways or susceptibility genes, and have been readily implemented in drug screening pipelines. We discuss some limitations of the current models that may arise from differences in structure of Appl and Tau compared to their human counterparts or from missing AβPP or MAPT protein interactors in flies. The advent of new genome modification technologies should allow the development of more realistic fly models and to better understand the relationship between AD and aging, taking advantage of the fly's short lifespan.
Collapse
Affiliation(s)
- Sylvina Bouleau
- Unité de Biologie Fonctionnelle et Adaptative (BFA), UMR8251 CNRS-Univ Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Hervé Tricoire
- Unité de Biologie Fonctionnelle et Adaptative (BFA), UMR8251 CNRS-Univ Paris Diderot, Sorbonne Paris Cité, Paris, France
| |
Collapse
|
3
|
Andreazza S, Bouleau S, Martin B, Lamouroux A, Ponien P, Papin C, Chélot E, Jacquet E, Rouyer F. Daytime CLOCK Dephosphorylation Is Controlled by STRIPAK Complexes in Drosophila. Cell Rep 2015; 11:1266-79. [PMID: 25981041 DOI: 10.1016/j.celrep.2015.04.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 02/23/2015] [Accepted: 04/16/2015] [Indexed: 11/29/2022] Open
Abstract
In the Drosophila circadian oscillator, the CLOCK/CYCLE complex activates transcription of period (per) and timeless (tim) in the evening. PER and TIM proteins then repress CLOCK (CLK) activity during the night. The pace of the oscillator depends upon post-translational regulation that affects both positive and negative components of the transcriptional loop. CLK protein is highly phosphorylated and inactive in the morning, whereas hypophosphorylated active forms are present in the evening. How this critical dephosphorylation step is mediated is unclear. We show here that two components of the STRIPAK complex, the CKA regulatory subunit of the PP2A phosphatase and its interacting protein STRIP, promote CLK dephosphorylation during the daytime. In contrast, the WDB regulatory PP2A subunit stabilizes CLK without affecting its phosphorylation state. Inhibition of the PP2A catalytic subunit and CKA downregulation affect daytime CLK similarly, suggesting that STRIPAK complexes are the main PP2A players in producing transcriptionally active hypophosphorylated CLK.
Collapse
Affiliation(s)
- Simonetta Andreazza
- Université Paris-Saclay, Université Paris-Sud, CNRS, UMR 9197, Institut des Neurosciences Paris-Saclay, 91190 Gif-sur-Yvette, France
| | - Sylvina Bouleau
- Université Paris-Saclay, Université Paris-Sud, CNRS, UMR 9197, Institut des Neurosciences Paris-Saclay, 91190 Gif-sur-Yvette, France
| | - Béatrice Martin
- Université Paris-Saclay, Université Paris-Sud, CNRS, UMR 9197, Institut des Neurosciences Paris-Saclay, 91190 Gif-sur-Yvette, France
| | - Annie Lamouroux
- Université Paris-Saclay, Université Paris-Sud, CNRS, UMR 9197, Institut des Neurosciences Paris-Saclay, 91190 Gif-sur-Yvette, France
| | - Prishila Ponien
- Institut de Chimie des Substances Naturelles, CNRS, UPR 2301, 91190 Gif-sur-Yvette, France
| | - Christian Papin
- Université Paris-Saclay, Université Paris-Sud, CNRS, UMR 9197, Institut des Neurosciences Paris-Saclay, 91190 Gif-sur-Yvette, France
| | - Elisabeth Chélot
- Université Paris-Saclay, Université Paris-Sud, CNRS, UMR 9197, Institut des Neurosciences Paris-Saclay, 91190 Gif-sur-Yvette, France
| | - Eric Jacquet
- Institut de Chimie des Substances Naturelles, CNRS, UPR 2301, 91190 Gif-sur-Yvette, France
| | - François Rouyer
- Université Paris-Saclay, Université Paris-Sud, CNRS, UMR 9197, Institut des Neurosciences Paris-Saclay, 91190 Gif-sur-Yvette, France.
| |
Collapse
|
4
|
Bouleau S, Pârvu-Ferecatu I, Rodriguez-Enfedaque A, Rincheval V, Grimal H, Mignotte B, Vayssiere JL, Renaud F. Fibroblast Growth Factor 1 inhibits p53-dependent apoptosis in PC12 cells. Apoptosis 2007; 12:1377-87. [PMID: 17473910 DOI: 10.1007/s10495-007-0072-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Abstract
The survival activity of FGF1 and the pro-apoptotic activity of p53 were characterized in vitro and/or in vivo for different types of neurons after different stresses and in different neurodegenerative pathologies. To investigate whether or not FGF1 and p53 pathways interact in neuronal cells, we studied the effect of FGF1 on p53-dependent apoptosis in PC12 cells. We first characterized p53-dependent PC12 cell death induced by etoposide (a DNA damaging agent). We showed that etoposide increased p53 stabilization, phosphorylation (Ser-15), nuclear translocation and transcriptional activity. In particular, p53 promoted mdm2, p21, puma and noxa expression in PC12 cells. The activation of p53 initiated a classical mitochondrial apoptosis process associated with caspases activation and nuclear degradation. We demonstrated that FGF1 protected PC12 cells from p53-dependent apoptosis upstream from mitochondrial and nuclear events. FGF1 inhibited etoposide-induced p53 phosphorylation, stabilization, nuclear translocation and transcriptional activity. This study presents the first evidence that FGF1 and p53 pathways interact in neuronal cells, and that FGF1 protects neuronal cells from p53-dependent apoptosis, suggesting that alterations of FGF1/p53 crosstalk could be involved in a large range of neurons and in neurological disorders.
Collapse
Affiliation(s)
- Sylvina Bouleau
- Laboratoire de Génétique et Biologie Cellulaire, UMR 8159 CNRS, Université de Versailles/Saint Quentin-en Yvelines, Ecole Pratique des Hautes Etudes, 45 avenue des Etats-Unis, 78035, Versailles Cedex, France
| | | | | | | | | | | | | | | |
Collapse
|
5
|
Bouleau S, Grimal H, Rincheval V, Godefroy N, Mignotte B, Vayssière JL, Renaud F. FGF1 inhibits p53-dependent apoptosis and cell cycle arrest via an intracrine pathway. Oncogene 2005; 24:7839-49. [PMID: 16091747 DOI: 10.1038/sj.onc.1208932] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
We analysed the relationships between p53-induced apoptosis and the acidic fibroblast growth factor 1 (FGF1) survival pathway. We found that p53 activation in rat embryonic fibroblasts induced the downregulation of FGF1 expression. These data suggest that the fgf1 gene is a repressed target of p53. Unlike extracellular FGF1, which has no effect on p53-dependent pathways, intracellular FGF1 inhibits both p53-dependent apoptosis and cell growth arrest via an intracrine pathway. FGF1 increases MDM2 expression at both mRNA and protein levels. This increase is associated with an acceleration of p53 degradation, which may partly account for the ability of endogenous FGF1 to counteract p53 pathways. In the presence of FGF1, p53 was unable to transactivate bax, but no modification of p21 gene transactivation was observed. As Bax is an essential component of the p53-dependent apoptosis pathway, this suggests that intracellular FGF1 inhibits p53 pathways not only by decreasing the stability of p53, but also by modifying some of its transactivation properties. In conclusion, we showed that p53 and FGF1 pathways may interact in the cell to determine cell fate. Deregulation of one of these pathways modifies the balance between cell proliferation and cell death and may lead to tumor progression.
Collapse
Affiliation(s)
- Sylvina Bouleau
- Laboratoire de Génétique et Biologie Cellulaire, Université de Versailles/Saint Quentin-en Yvelines, CNRS FRE 2445, France
| | | | | | | | | | | | | |
Collapse
|
6
|
Lemaire C, Godefroy N, Costina-Parvu I, Rincheval V, Renaud F, Trotot P, Bouleau S, Mignotte B, Vayssière JL. Caspase-9 can antagonize p53-induced apoptosis by generating a p76(Rb) truncated form of Rb. Oncogene 2005; 24:3297-308. [PMID: 15735701 DOI: 10.1038/sj.onc.1208493] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The tumor suppressor Rb (retinoblastoma protein) is known to regulate p53-dependent apoptosis, but the mechanisms involved are unclear. In a rat fibroblast model, we previously observed that caspase inhibition potentiates p53-dependent apoptosis and prevents the Rb cleavage associated with p53 activation. These results suggested that a caspase(s) can antagonize p53-mediated apoptosis via the production of a protective Rb truncated form. Here, we identify caspase-9 as the caspase that interferes, upstream of the mitochondrion, with p53-induced apoptosis in both immortalized and primary fibroblasts. This caspase can be detected as a p38 processed form in living cells, in the absence of apoptosome formation and apoptotic signal. We also provide evidence that the involvement of caspase-9 in a pre-mitochondrial protective pathway results from the previously undescribed cleavage of Rb, at a LExD site, into a p76(Rb) form, which antagonizes p53-induced apoptosis. These results establish that a truncated form of Rb can display an antiapoptotic activity, rather than just being a by-product of Rb degradation.
Collapse
Affiliation(s)
- Christophe Lemaire
- Laboratoire de Génétique et Biologie Cellulaire, CNRS FRE 2445, Université de Versailles/St Quentin-en-Yvelines, 45 avenue des Etats-Unis, 78035 Versailles cedex, France
| | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Godefroy N, Bouleau S, Gruel G, Renaud F, Rincheval V, Mignotte B, Tronik-Le Roux D, Vayssière JL. Transcriptional repression by p53 promotes a Bcl-2-insensitive and mitochondria-independent pathway of apoptosis. Nucleic Acids Res 2004; 32:4480-90. [PMID: 15326223 PMCID: PMC516049 DOI: 10.1093/nar/gkh773] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
p53 can induce apoptosis in various ways including transactivation, transrepression and transcription-independent mechanisms. What determines the choice between them is poorly understood. In a rat embryo fibroblast model, caspase inhibition changed the outcome of p53 activation from standard Bcl-2-regulated apoptosis to caspase-independent and Bcl-2-insensitive cell death, a phenomenon not described previously. Here, we show that caspase inhibition affects cell death commitment decisions by modulating the apoptotic functions of p53. Indeed, in the Bcl-2-sensitive pathway, transactivation-dependent signalling is activated leading to a rapid MDM2-mediated degradation of p53. In contrast, in the Bcl-2-insensitive pathway, p53 is stable and this is associated with transrepression-dependent signalling. A study with microarrays identified these genes regulated by p53 in the absence of active caspases.
Collapse
Affiliation(s)
- Nelly Godefroy
- Université de Versailles/Saint Quentin-en-Yvelines, FRE 2445, Laboratoire de Génétique et Biologie Cellulaire and Ecole Pratique des Hautes Etudes, Versailles cedex, France
| | | | | | | | | | | | | | | |
Collapse
|