Temporal analysis of Brd4 displacement in the control of B cell survival, proliferation, and differentiation

Kong, IY; Rimes, JS; Light, A; Todorovski, I; JONES, S; Morand, E; Knight, DA; Bergman, YE; Hogg, SJ; Falk, H; Monahan, BJ; Stupple, PA; Street, IP; Heinzel, S; Bouillet, P; Johnstone, RW; Hodgkin, PD; Vervoort, SJ; Hawkins, ED

Author(s): Kong, IY; Rimes, JS; Light, A; Todorovski, I; JONES, S; Morand, E; Knight, DA; Bergman, YE; Hogg, SJ; Falk, H; Monahan, BJ; Stupple, PA; Street, IP; Heinzel, S; Bouillet, P; Johnstone, RW; Hodgkin, PD; Vervoort, SJ; Hawkins, ED;
Details: Publication Year 2020-10-20,Volume 33,Issue #3,Page 108290
Journal Title: Cell Reports
Publication Type: Journal Article
Abstract: JQ1 is a BET-bromodomain inhibitor that has immunomodulatory effects. However, the precise molecular mechanism that JQ1 targets to elicit changes in antibody production is not understood. Our results show that JQ1 induces apoptosis, reduces cell proliferation, and as a consequence, inhibits antibody-secreting cell differentiation. ChIP-sequencing reveals a selective displacement of Brd4 in response to acute JQ1 treatment (<2 h), resulting in specific transcriptional repression. After 8 h, subsequent alterations in gene expression arise as a result of the global loss of Brd4 occupancy. We demonstrate that apoptosis induced by JQ1 is solely attributed to the pro-apoptotic protein Bim (Bcl2l11). Conversely, cell-cycle regulation by JQ1 is associated with multiple Myc-associated gene targets. Our results demonstrate that JQ1 drives temporal changes in Brd4 displacement that results in a specific transcriptional profile that directly affects B cell survival and proliferation to modulate the humoral immune response.
Publisher: Cell Press
Keywords: B cells; cellular immunology; epigenetics; Hoffmann-La Roche, Bristol-Myers Squibb, and MecRx. R.W.J. is a scientific; consultant and shareholder in MecRx.
Research Division(s): Immunology; Personalised Oncology; Inflammation
PubMed ID: 33086063
Publisher's Version: https://doi.org/10.1016/j.celrep.2020.108290
Open Access at Publisher's Site: https://doi.org/10.1016/j.celrep.2020.108290
Terms of Use/Rights Notice: Refer to copyright notice on published article.
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Creation Date: 2021-02-01 12:05:23

Last Modified: 2021-03-02 10:53:23