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Hipp N, Symington H, Pastoret C, Caron G, Monvoisin C, Tarte K, Fest T, Delaloy C. IL-2 imprints human naive B cell fate towards plasma cell through ERK/ELK1-mediated BACH2 repression. Nat Commun 2017; 8:1443. [PMID: 29129929 PMCID: PMC5682283 DOI: 10.1038/s41467-017-01475-7] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 09/19/2017] [Indexed: 01/23/2023] Open
Abstract
Plasma cell differentiation is a tightly regulated process that requires appropriate T cell helps to reach the induction threshold. To further understand mechanisms by which T cell inputs regulate B cell fate decision, we investigate the minimal IL-2 stimulation for triggering human plasma cell differentiation in vitro. Here we show that the timed repression of BACH2 through IL-2-mediated ERK/ELK1 signalling pathway directs plasma cell lineage commitment. Enforced BACH2 repression in activated B cells unlocks the plasma cell transcriptional program and induces their differentiation into immunoglobulin M-secreting cells. RNA-seq and ChIP-seq results further identify BACH2 target genes involved in this process. An active regulatory region within the BACH2 super-enhancer, under ELK1 control and differentially regulated upon B-cell activation and cellular divisions, helps integrate IL-2 signal. Our study thus provides insights into the temporal regulation of BACH2 and its targets for controlling the differentiation of human naive B cells. T cells help B cells to differentiate into antibody-producing plasma cells. Here the authors show that T cells produce interleukin-2 to activate ERK/ELK1 and suppress BACH2 expression by modulating the BACH2 super-enhancer, thereby altering BACH2 downstream transcription programs for plasma cell differentiation.
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Affiliation(s)
- Nicolas Hipp
- UMR U1236, Université de Rennes 1, INSERM, Etablissement Français du Sang (EFS) de Bretagne, Equipe labellisée Ligue contre le Cancer, Labex IGO, 2 Av du Pr Léon Bernard, 35043, Rennes, France
| | - Hannah Symington
- UMR U1236, Université de Rennes 1, INSERM, Etablissement Français du Sang (EFS) de Bretagne, Equipe labellisée Ligue contre le Cancer, Labex IGO, 2 Av du Pr Léon Bernard, 35043, Rennes, France
| | - Cédric Pastoret
- UMR U1236, Université de Rennes 1, INSERM, Etablissement Français du Sang (EFS) de Bretagne, Equipe labellisée Ligue contre le Cancer, Labex IGO, 2 Av du Pr Léon Bernard, 35043, Rennes, France.,Laboratoire d'Hématologie, Centre Hospitalier Universitaire (CHU) Rennes, 2 rue Henri Le Guilloux, 35033, Rennes Cedex 9, France
| | - Gersende Caron
- UMR U1236, Université de Rennes 1, INSERM, Etablissement Français du Sang (EFS) de Bretagne, Equipe labellisée Ligue contre le Cancer, Labex IGO, 2 Av du Pr Léon Bernard, 35043, Rennes, France.,Laboratoire d'Hématologie, Centre Hospitalier Universitaire (CHU) Rennes, 2 rue Henri Le Guilloux, 35033, Rennes Cedex 9, France
| | - Céline Monvoisin
- UMR U1236, Université de Rennes 1, INSERM, Etablissement Français du Sang (EFS) de Bretagne, Equipe labellisée Ligue contre le Cancer, Labex IGO, 2 Av du Pr Léon Bernard, 35043, Rennes, France
| | - Karin Tarte
- UMR U1236, Université de Rennes 1, INSERM, Etablissement Français du Sang (EFS) de Bretagne, Equipe labellisée Ligue contre le Cancer, Labex IGO, 2 Av du Pr Léon Bernard, 35043, Rennes, France.,Laboratoire d'Immunologie, Thérapie Cellulaire et Hématopoïèse (ITeCH), Centre Hospitalier Universitaire (CHU) Rennes, 2 rue Henri Le Guilloux, 35033, Rennes Cedex 9, France
| | - Thierry Fest
- UMR U1236, Université de Rennes 1, INSERM, Etablissement Français du Sang (EFS) de Bretagne, Equipe labellisée Ligue contre le Cancer, Labex IGO, 2 Av du Pr Léon Bernard, 35043, Rennes, France. .,Laboratoire d'Hématologie, Centre Hospitalier Universitaire (CHU) Rennes, 2 rue Henri Le Guilloux, 35033, Rennes Cedex 9, France.
| | - Céline Delaloy
- UMR U1236, Université de Rennes 1, INSERM, Etablissement Français du Sang (EFS) de Bretagne, Equipe labellisée Ligue contre le Cancer, Labex IGO, 2 Av du Pr Léon Bernard, 35043, Rennes, France.
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