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Rieu Q, Bougoüin A, Zagar Y, Chatagnon J, Hamieh A, Enderlin J, Huby T, Nandrot EF. Pleiotropic Roles of Scavenger Receptors in Circadian Retinal Phagocytosis: A New Function for Lysosomal SR-B2/LIMP-2 at the RPE Cell Surface. Int J Mol Sci 2022; 23:ijms23073445. [PMID: 35408805 PMCID: PMC8998831 DOI: 10.3390/ijms23073445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 03/08/2022] [Accepted: 03/17/2022] [Indexed: 11/29/2022] Open
Abstract
The retinal phagocytic machinery resembles the one used by macrophages to clear apoptotic cells. However, in the retina, the permanent contact between photoreceptor outer segments (POS) and retinal pigment epithelial (RPE) cells requires a tight control of this circadian machinery. In addition to the known receptors synchronizing POS internalization, several others are expressed by RPE cells. Notably, scavenger receptor CD36 has been shown to intervene in the internalization speed. We thus investigated members of the scavenger receptor family class A SR-AI and MARCO and class B CD36, SR-BI and SR-B2/LIMP-2 using immunoblotting, immunohisto- and immunocytochemistry, lipid raft flotation gradients, phagocytosis assays after siRNA/antibody inhibition, RT-qPCR and western blot analysis along the light:dark cycle. All receptors were expressed by RPE cell lines and tissues and colocalized with POS, except SR-BI. All receptors were associated with lipid rafts, and even more upon POS challenge. SR-B2/LIMP-2 inhibition suggested a role in the control of the internalization speed similar to CD36. In vivo, MARCO and CD36 displayed rhythmic gene and protein expression patterns concomitant with the phagocytic peak. Taken together, our results indicate that CD36 and SR-B2/LIMP-2 play a direct regulatory role in POS phagocytosis dynamics, while the others such as MARCO might participate in POS clearance by RPE cells either as co-receptors or via an indirect process.
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Affiliation(s)
- Quentin Rieu
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (Q.R.); (A.B.); (Y.Z.); (J.C.); (A.H.); (J.E.)
| | - Antoine Bougoüin
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (Q.R.); (A.B.); (Y.Z.); (J.C.); (A.H.); (J.E.)
| | - Yvrick Zagar
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (Q.R.); (A.B.); (Y.Z.); (J.C.); (A.H.); (J.E.)
| | - Jonathan Chatagnon
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (Q.R.); (A.B.); (Y.Z.); (J.C.); (A.H.); (J.E.)
| | - Abdallah Hamieh
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (Q.R.); (A.B.); (Y.Z.); (J.C.); (A.H.); (J.E.)
| | - Julie Enderlin
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (Q.R.); (A.B.); (Y.Z.); (J.C.); (A.H.); (J.E.)
| | - Thierry Huby
- Sorbonne Université, INSERM, UMR-S 1166, F-75013 Paris, France;
| | - Emeline F. Nandrot
- Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012 Paris, France; (Q.R.); (A.B.); (Y.Z.); (J.C.); (A.H.); (J.E.)
- Correspondence: ; Tel.: +33-1-5346-2541; Fax: +33-1-5346-2602
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Hamieh A, Nandrot EF. Retinal Pigment Epithelial Cells: The Unveiled Component in the Etiology of Prpf Splicing Factor-Associated Retinitis Pigmentosa. Adv Exp Med Biol 2020; 1185:227-231. [PMID: 31884616 DOI: 10.1007/978-3-030-27378-1_37] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pre-mRNA splicing is a critical step in RNA processing in all eukaryotic cells. It consists of introns removal and requires the assembly of a large RNA-protein complex called the spliceosome. This complex of small nuclear ribonucleoproteins is associated with accessory proteins from the pre-mRNA processing factor (PRPF) family. Mutations in different splicing factor-encoding genes were identified in retinitis pigmentosa (RP) patients. A surprising feature of these ubiquitous factors is that the outcome of their alteration is restricted to the retina. Because of their high metabolic demand, most studies focused on photoreceptors dysfunction and associated degeneration. However, cells from the retinal pigment epithelium (RPE) are also crucial to maintaining retinal homeostasis and photoreceptor function. Moreover, mutations in RPE-specific genes are associated with some RP cases. Indeed, we identified major RPE defects in Prpf31-mutant mice: circadian rhythms of both photoreceptor outer segments (POS) phagocytosis and retinal adhesion were attenuated or lost, leading to ultrastructural anomalies and vacuoles. Taken together, our published and ongoing data suggest that (1) similar molecular events take place in human and mouse cells and (2) these functional defects generate various stress processes.
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Affiliation(s)
- Abdallah Hamieh
- Therapeutics Department, Sorbonne Université, INSERM, CNRS, Institut de la Vision, Paris, France
| | - Emeline F Nandrot
- Therapeutics Department, Sorbonne Université, INSERM, CNRS, Institut de la Vision, Paris, France.
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Hamieh A, Cartier D, Abid H, Calas A, Burel C, Bucharles C, Jehan C, Grumolato L, Landry M, Lerouge P, Anouar Y, Lihrmann I. Selenoprotein T is a novel OST subunit that regulates UPR signaling and hormone secretion. EMBO Rep 2017; 18:1935-1946. [PMID: 28928140 DOI: 10.15252/embr.201643504] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 08/04/2017] [Accepted: 08/09/2017] [Indexed: 12/12/2022] Open
Abstract
Selenoprotein T (SelT) is a recently characterized thioredoxin-like protein whose expression is very high during development, but is confined to endocrine tissues in adulthood where its function is unknown. We report here that SelT is required for adaptation to the stressful conditions of high hormone level production in endocrine cells. Using immunofluorescence and TEM immunogold approaches, we find that SelT is expressed at the endoplasmic reticulum membrane in all hormone-producing pituitary cell types. SelT knockdown in corticotrope cells promotes unfolded protein response (UPR) and ER stress and lowers endoplasmic reticulum-associated protein degradation (ERAD) and hormone production. Using a screen in yeast for SelT-membrane protein interactions, we sort keratinocyte-associated protein 2 (KCP2), a subunit of the protein complex oligosaccharyltransferase (OST). In fact, SelT interacts not only with KCP2 but also with other subunits of the A-type OST complex which are depleted after SelT knockdown leading to POMC N-glycosylation defects. This study identifies SelT as a novel subunit of the A-type OST complex, indispensable for its integrity and for ER homeostasis, and exerting a pivotal adaptive function that allows endocrine cells to properly achieve the maturation and secretion of hormones.
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Affiliation(s)
- Abdallah Hamieh
- Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Rouen-Normandie University UNIROUEN, Inserm, U1239, Mont-Saint-Aignan, France.,Institute for Research and Innovation in Biomedicine, Rouen, France
| | - Dorthe Cartier
- Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Rouen-Normandie University UNIROUEN, Inserm, U1239, Mont-Saint-Aignan, France.,Institute for Research and Innovation in Biomedicine, Rouen, France
| | - Houssni Abid
- Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Rouen-Normandie University UNIROUEN, Inserm, U1239, Mont-Saint-Aignan, France.,Institute for Research and Innovation in Biomedicine, Rouen, France
| | - André Calas
- Interdisciplinary Institute for Neuroscience, CNRS UMR 5297, University of Bordeaux, Bordeaux, France
| | - Carole Burel
- Institute for Research and Innovation in Biomedicine, Rouen, France.,Glyco-MEV Laboratory, Rouen-Normandie University UNIROUEN, Mont-Saint-Aignan, France
| | - Christine Bucharles
- Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Rouen-Normandie University UNIROUEN, Inserm, U1239, Mont-Saint-Aignan, France.,Institute for Research and Innovation in Biomedicine, Rouen, France
| | - Cedric Jehan
- Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Rouen-Normandie University UNIROUEN, Inserm, U1239, Mont-Saint-Aignan, France.,Institute for Research and Innovation in Biomedicine, Rouen, France
| | - Luca Grumolato
- Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Rouen-Normandie University UNIROUEN, Inserm, U1239, Mont-Saint-Aignan, France.,Institute for Research and Innovation in Biomedicine, Rouen, France
| | - Marc Landry
- Interdisciplinary Institute for Neuroscience, CNRS UMR 5297, University of Bordeaux, Bordeaux, France
| | - Patrice Lerouge
- Institute for Research and Innovation in Biomedicine, Rouen, France.,Glyco-MEV Laboratory, Rouen-Normandie University UNIROUEN, Mont-Saint-Aignan, France
| | - Youssef Anouar
- Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Rouen-Normandie University UNIROUEN, Inserm, U1239, Mont-Saint-Aignan, France.,Institute for Research and Innovation in Biomedicine, Rouen, France
| | - Isabelle Lihrmann
- Neuronal and Neuroendocrine Differentiation and Communication Laboratory, Rouen-Normandie University UNIROUEN, Inserm, U1239, Mont-Saint-Aignan, France .,Institute for Research and Innovation in Biomedicine, Rouen, France
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Boukhzar L, Hamieh A, Cartier D, Tanguy Y, Alsharif I, Castex M, Arabo A, Hajji SE, Bonnet JJ, Errami M, Falluel-Morel A, Chagraoui A, Lihrmann I, Anouar Y. Selenoprotein T Exerts an Essential Oxidoreductase Activity That Protects Dopaminergic Neurons in Mouse Models of Parkinson's Disease. Antioxid Redox Signal 2016; 24:557-74. [PMID: 26866473 PMCID: PMC4840926 DOI: 10.1089/ars.2015.6478] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 02/05/2016] [Accepted: 02/06/2016] [Indexed: 12/22/2022]
Abstract
AIMS Oxidative stress is central to the pathogenesis of Parkinson's disease (PD), but the mechanisms involved in the control of this stress in dopaminergic cells are not fully understood. There is increasing evidence that selenoproteins play a central role in the control of redox homeostasis and cell defense, but the precise contribution of members of this family of proteins during the course of neurodegenerative diseases is still elusive. RESULTS We demonstrated first that selenoprotein T (SelT) whose gene disruption is lethal during embryogenesis, exerts a potent oxidoreductase activity. In the SH-SY5Y cell model of dopaminergic neurons, both silencing and overexpression of SelT affected oxidative stress and cell survival. Treatment with PD-inducing neurotoxins such as 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) or rotenone triggered SelT expression in the nigrostriatal pathway of wild-type mice, but provoked rapid and severe parkinsonian-like motor defects in conditional brain SelT-deficient mice. This motor impairment was associated with marked oxidative stress and neurodegeneration and decreased tyrosine hydroxylase activity and dopamine levels in the nigrostriatal system. Finally, in PD patients, we report that SelT is tremendously increased in the caudate putamen tissue. INNOVATION These results reveal the activity of a novel selenoprotein enzyme that protects dopaminergic neurons against oxidative stress and prevents early and severe movement impairment in animal models of PD. CONCLUSIONS Our findings indicate that selenoproteins such as SelT play a crucial role in the protection of dopaminergic neurons against oxidative stress and cell death, providing insight into the molecular underpinnings of this stress in PD.
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Affiliation(s)
- Loubna Boukhzar
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Abdallah Hamieh
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Dorthe Cartier
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Yannick Tanguy
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Ifat Alsharif
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Matthieu Castex
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Arnaud Arabo
- Faculty of Sciences, University of Rouen, Mont-Saint-Aignan, France
| | - Sana El Hajji
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Jean-Jacques Bonnet
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Mohammed Errami
- Department of Biology, Faculty of Sciences, Abdelmalek Essaadi University, Tetouan, Morocco
| | - Anthony Falluel-Morel
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Abdeslam Chagraoui
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Isabelle Lihrmann
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
| | - Youssef Anouar
- Inserm U982, Laboratory of Neuronal and Neuroendocrine Differentiation and Communication, Mont-Saint-Aignan, France
- Com UE, Normandy University of Rouen, France
- Institute for Research and Innovation in Biomedicine, University of Rouen, Mont-Saint-Aignan, Rouen, France
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Cheung CT, Bendris N, Paul C, Hamieh A, Anouar Y, Hahne M, Blanchard JM, Lemmers B. Cyclin A2 modulates EMT via β-catenin and phospholipase C pathways. Carcinogenesis 2015; 36:914-24. [PMID: 25993989 DOI: 10.1093/carcin/bgv069] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 05/06/2015] [Indexed: 12/15/2022] Open
Abstract
We have previously demonstrated that Cyclin A2 is involved in cytoskeletal dynamics, epithelial-mesenchymal transition (EMT) and metastasis. This phenotype was potentiated by activated oncogenic H-Ras. However, the mechanisms governing EMT in these cells have not yet been elucidated. Here, we dissected the pathways that are responsible for EMT in cells deficient for Cyclin A2. In Cyclin A2-depleted normal murine mammary gland (NMuMG) cells expressing RasV12, we found that β-catenin was liberated from the cell membrane and cell-cell junctions and underwent nuclear translocation and activation. Components of the canonical wingless (WNT) pathway, including WNT8b, WNT10a, WNT10b, frizzled 1 and 2 and TCF4 were upregulated at the messenger RNA and protein levels following Cyclin A2 depletion. However, suppression of the WNT pathway using the acetyltransferase porcupine inhibitor C59 did not reverse EMT whereas a dominant negative form of TCF4 as well as inhibition of phospholipase C using U73122 were able to do so. This suggests that a WNT-independent mechanism of β-catenin activation via phospholipase C is involved in the EMT induced by Cyclin A2 depletion. Our findings will broaden our knowledge on how Cyclin A2 contributes to EMT and metastasis.
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Affiliation(s)
- Caroline T Cheung
- Institut de Génétique Moléculaire de Montpellier, CNRS, France-Université Montpellier 2, France-Université Montpellier 1, Montpellier, France
| | - Nawal Bendris
- Institut de Génétique Moléculaire de Montpellier, CNRS, France-Université Montpellier 2, France-Université Montpellier 1, Montpellier, France, UT Southwestern Medical Center, Department of Cell Biology, Dallas, TX, USA and
| | - Conception Paul
- Institut de Génétique Moléculaire de Montpellier, CNRS, France-Université Montpellier 2, France-Université Montpellier 1, Montpellier, France
| | - Abdallah Hamieh
- INSERM U982, Neuronal and Neuroendocrine Differentiation and Communication, Université de Rouen, Mont-Saint-Aignan, France
| | - Youssef Anouar
- INSERM U982, Neuronal and Neuroendocrine Differentiation and Communication, Université de Rouen, Mont-Saint-Aignan, France
| | - Michael Hahne
- Institut de Génétique Moléculaire de Montpellier, CNRS, France-Université Montpellier 2, France-Université Montpellier 1, Montpellier, France
| | - Jean-Marie Blanchard
- Institut de Génétique Moléculaire de Montpellier, CNRS, France-Université Montpellier 2, France-Université Montpellier 1, Montpellier, France,
| | - Bénédicte Lemmers
- Institut de Génétique Moléculaire de Montpellier, CNRS, France-Université Montpellier 2, France-Université Montpellier 1, Montpellier, France,
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