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Pereira B, Amaral AL, Dias A, Mendes N, Muncan V, Silva AR, Thibert C, Radu AG, David L, Máximo V, van den Brink GR, Billaud M, Almeida R. MEX3A regulates Lgr5 + stem cell maintenance in the developing intestinal epithelium. EMBO Rep 2020; 21:e48938. [PMID: 32052574 PMCID: PMC7132344 DOI: 10.15252/embr.201948938] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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: 07/24/2019] [Revised: 01/15/2020] [Accepted: 01/20/2020] [Indexed: 12/12/2022] Open
Abstract
Intestinal stem cells (ISCs) fuel the lifelong self‐renewal of the intestinal tract and are paramount for epithelial repair. In this context, the Wnt pathway component LGR5 is the most consensual ISC marker to date. Still, the effort to better understand ISC identity and regulation remains a challenge. We have generated a Mex3a knockout mouse model and show that this RNA‐binding protein is crucial for the maintenance of the Lgr5+ISC pool, as its absence disrupts epithelial turnover during postnatal development and stereotypical organoid maturation ex vivo. Transcriptomic profiling of intestinal crypts reveals that Mex3a deletion induces the peroxisome proliferator‐activated receptor (PPAR) pathway, along with a decrease in Wnt signalling and loss of the Lgr5+ stem cell signature. Furthermore, we identify PPARγ activity as a molecular intermediate of MEX3A‐mediated regulation. We also show that high PPARγ signalling impairs Lgr5+ISC function, thus uncovering a new layer of post‐transcriptional regulation that critically contributes to intestinal homeostasis.
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Affiliation(s)
- Bruno Pereira
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Ana L Amaral
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Alexandre Dias
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Nuno Mendes
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Vanesa Muncan
- Department of Gastroenterology and Hepatology, Amsterdam UMC, Tytgat Institute, University of Amsterdam, Amsterdam, The Netherlands
| | - Ana R Silva
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal
| | - Chantal Thibert
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, University Grenoble Alpes, Grenoble, France
| | - Anca G Radu
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, University Grenoble Alpes, Grenoble, France
| | - Leonor David
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal.,FMUP-Faculty of Medicine, University of Porto, Porto, Portugal
| | - Valdemar Máximo
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal.,FMUP-Faculty of Medicine, University of Porto, Porto, Portugal
| | - Gijs R van den Brink
- Department of Gastroenterology and Hepatology, Amsterdam UMC, Tytgat Institute, University of Amsterdam, Amsterdam, The Netherlands.,Medicines Research Center, GSK, Stevenage, UK
| | - Marc Billaud
- Clinical and Experimental Model of Lymphomagenesis, INSERM U1052, CNRS UMR5286, Centre Léon Bérard, Université Claude Bernard Lyon 1, Centre de Recherche en Cancérologie de Lyon, Lyon, France
| | - Raquel Almeida
- i3S - Institute for Research and Innovation in Health (Instituto de Investigação e Inovação em Saúde), University of Porto, Porto, Portugal.,IPATIMUP - Institute of Molecular Pathology and Immunology, University of Porto, Porto, Portugal.,FMUP-Faculty of Medicine, University of Porto, Porto, Portugal.,Biology Department, Faculty of Sciences, University of Porto, Porto, Portugal
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Radu AG, Torch S, Fauvelle F, Pernet-Gallay K, Lucas A, Blervaque R, Delmas V, Schlattner U, Lafanechère L, Hainaut P, Tricaud N, Pingault V, Bondurand N, Bardeesy N, Larue L, Thibert C, Billaud M. LKB1 specifies neural crest cell fates through pyruvate-alanine cycling. Sci Adv 2019; 5:eaau5106. [PMID: 31328154 PMCID: PMC6636984 DOI: 10.1126/sciadv.aau5106] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 06/10/2019] [Indexed: 05/08/2023]
Abstract
Metabolic processes underlying the development of the neural crest, an embryonic population of multipotent migratory cells, are poorly understood. Here, we report that conditional ablation of the Lkb1 tumor suppressor kinase in mouse neural crest stem cells led to intestinal pseudo-obstruction and hind limb paralysis. This phenotype originated from a postnatal degeneration of the enteric nervous ganglia and from a defective differentiation of Schwann cells. Metabolomic profiling revealed that pyruvate-alanine conversion is enhanced in the absence of Lkb1. Mechanistically, inhibition of alanine transaminases restored glial differentiation in an mTOR-dependent manner, while increased alanine level directly inhibited the glial commitment of neural crest cells. Treatment with the metabolic modulator AICAR suppressed mTOR signaling and prevented Schwann cell and enteric defects of Lkb1 mutant mice. These data uncover a link between pyruvate-alanine cycling and the specification of glial cell fate with potential implications in the understanding of the molecular pathogenesis of neural crest diseases.
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Affiliation(s)
- Anca G. Radu
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, Université Grenoble Alpes, 38000 Grenoble, France
| | - Sakina Torch
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, Université Grenoble Alpes, 38000 Grenoble, France
| | - Florence Fauvelle
- Univ. Grenoble Alpes, INSERM, U1216, Grenoble Institute of Neurosciences GIN, 38000 Grenoble, France
- Univ. Grenoble Alpes, INSERM, US17, MRI facility IRMaGe, 38000 Grenoble, France
| | - Karin Pernet-Gallay
- Univ. Grenoble Alpes, INSERM, U1216, Grenoble Institute of Neurosciences GIN, 38000 Grenoble, France
| | - Anthony Lucas
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, Université Grenoble Alpes, 38000 Grenoble, France
| | - Renaud Blervaque
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, Université Grenoble Alpes, 38000 Grenoble, France
| | - Véronique Delmas
- Institut Curie, Normal and Pathological Development of Melanocytes, CNRS UMR3347; INSERM U1021; Equipe Labellisée–Ligue Nationale Contre le Cancer, Orsay, France
| | - Uwe Schlattner
- Laboratory of Fundamental and Applied Bioenergetics, Univ Grenoble Alpes, 38185 Grenoble, France
- INSERM U1055, 38041 Grenoble France
| | - Laurence Lafanechère
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, Université Grenoble Alpes, 38000 Grenoble, France
| | - Pierre Hainaut
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, Université Grenoble Alpes, 38000 Grenoble, France
| | - Nicolas Tricaud
- INSERM U1051, Institut des Neurosciences de Montpellier (INM), Université de Montpellier, Montpellier, France
| | | | | | - Nabeel Bardeesy
- Cancer Center, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114, USA
- Center for Regenerative Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114, USA
- Department of Medicine, Harvard Medical School, Boston, MA 02114, USA
| | - Lionel Larue
- Institut Curie, Normal and Pathological Development of Melanocytes, CNRS UMR3347; INSERM U1021; Equipe Labellisée–Ligue Nationale Contre le Cancer, Orsay, France
| | - Chantal Thibert
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, Université Grenoble Alpes, 38000 Grenoble, France
- Corresponding author. (M.B.); (C.T.)
| | - Marc Billaud
- Institute for Advanced Biosciences, INSERM U1209, CNRS UMR5309, Université Grenoble Alpes, 38000 Grenoble, France
- “Clinical and experimental model of lymphomagenesis” Univ Lyon, Université Claude Bernard Lyon1, INSERM 1052, CNRS 5286, Centre Léon Bérard, Centre de recherche en cancérologie de Lyon, Lyon France
- Corresponding author. (M.B.); (C.T.)
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Creuzet SE, Viallet JP, Ghawitian M, Torch S, Thélu J, Alrajeh M, Radu AG, Bouvard D, Costagliola F, Borgne ML, Buchet-Poyau K, Aznar N, Buschlen S, Hosoya H, Thibert C, Billaud M. LKB1 signaling in cephalic neural crest cells is essential for vertebrate head development. Dev Biol 2016; 418:283-96. [DOI: 10.1016/j.ydbio.2016.08.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 07/19/2016] [Accepted: 08/06/2016] [Indexed: 11/25/2022]
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