Cited by 238Cardiac Fibrosis and RemodelingCongenital heart defects researchTGF-β signaling in diseases

A transcriptional switch governs fibroblast activation in heart disease

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Alexanian, Michael, Przytycki, Pawel F., Micheletti, Rudi, Padmanabhan, Arun, Ye, Lin, Travers, Joshua G., Gonzalez-Teran, Barbara, Silva, Ana Catarina +17 more·2021·Nature

Published version of a preprint

Abstract

In diseased organs, stress-activated signalling cascades alter chromatin, thereby triggering maladaptive cell state transitions. Fibroblast activation is a common stress response in tissues that worsens lung, liver, kidney and heart disease, yet its mechanistic basis remains unclear 1,2. Pharmacological inhibition of bromodomain and extra-terminal domain (BET) proteins alleviates cardiac dysfunction 3-7, providing a tool to interrogate and modulate cardiac cell states as a potential therapeutic approach. Here we use single-cell epigenomic analyses of hearts dynamically exposed to BET inhibitors to reveal a reversible transcriptional switch that underlies the activation of fibroblasts. Resident cardiac fibroblasts demonstrated robust toggling between the quiescent and activated state in a manner directly correlating with BET inhibitor exposure and cardiac function. Single-cell chromatin accessibility revealed previously undescribed DNA elements, the accessibility of which dynamically correlated with cardiac performance. Among the most dynamic elements was an enhancer that regulated the transcription factor MEOX1, which was specifically expressed in activated fibroblasts, occupied putative regulatory elements of a broad fibrotic gene program and was required for TGFβ-induced fibroblast activation. Selective CRISPR inhibition of the single most dynamic cis-element within the enhancer blocked TGFβ-induced Meox1 activation. We identify MEOX1 as a central regulator of fibroblast activation associated with cardiac dysfunction and demonstrate its upregulation after activation of human lung, liver and kidney fibroblasts. The plasticity and specificity of BET-dependent regulation of MEOX1 in tissue fibroblasts provide previously unknown trans- and cis-targets for treating fibrotic disease.

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Crossref · 10.1038/s41586-021-03674-1

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  • Among cardiac cell clusters, fibroblasts showed the strongest enrichment for genes whose expression tracked cardiac function.

    “As expected4, fibroblasts had the highest enrichment of genes whose expression significantly correlated with cardiac function (Fig. 1E).”

    From Chromatin remodelling drives immune cell–fibroblast communication in heart failure (2024) · cites this paper as [4]

    The ‘Chromatin state and cardiac function’ section reports correlations between cardiac function and fibroblast enhancer accessibility, not gene expression. The ‘Transcriptional plasticity of fibroblasts’ section describes fibroblast transcriptomic changes, but our copy does not show that fibroblasts had the highest enrichment of genes whose expression significantly correlated with cardiac function. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • JQ1 treatment can reversibly direct fibroblast activation away from the FAP/POSTN cell state, indicating therapeutic potential of targeting the differentiation and maturation of FAP-positive fibroblasts.

    “The possibility that JQ1 treatment can reversibly direct fibroblast activation away from the FAP/POSTN cell state indicates the therapeutic potential of targeting the differentiation and maturation of FAP+ fibroblasts28,30.”

    From Targeting immune–fibroblast cell communication in heart failure (2024) · cites this paper as [28]

    In “Transcriptional plasticity of fibroblasts” (page unavailable), the paper reports that JQ1 shifted stressed cardiac fibroblasts toward a sham-like state and reduced Postn expression; withdrawal reversed these effects. Our copy does not identify a FAP/POSTN cell state or specifically establish that JQ1 targets the differentiation and maturation of FAP-positive fibroblasts. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • In mice with pressure-overload heart failure, BET inhibition with JQ1 strongly protected left ventricular ejection fraction.

    “BET inhibition exerted a strong protective effect on left ventricular ejection fraction (Fig. 1B)4,6-10.”
  • BRD4 has specific importance in aspects of heart failure pathogenesis.

    “We previously showed the specific importance of BRD4 in aspects of heart failure pathogenesis4,25.”
  • JQ1-associated transcriptional changes in cardiomyocytes are modest compared with other cardiac cell populations.

    “Given our observation that transcriptional changes associated with JQ1 in the cardiomyocyte (CM) compartment are modest compared to other cardiac cell populations4,11”

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Authors
Alexanian, M., Przytycki, P. F., Micheletti, R., Padmanabhan, A., Ye, L., Travers, J. G., Gonzalez-Teran, B., Silva, A. C., Duan, Q., Ranade, S. S., Felix, F., Linares-Saldana, R., Li, L., Lee, C. Y., Sadagopan, N., Pelonero, A., Huang, Y., Andreoletti, G., Jain, R., McKinsey, T. A., Rosenfeld, M. G., Gifford, C. A., Pollard, K. S., Haldar, S. M., & Srivastava, D.
Affiliations
  • Gladstone Institutes (US)
  • Howard Hughes Medical Institute (US)
  • University of Colorado Anschutz (US)
  • University of Pennsylvania (US)
  • University of California, San Francisco (US)
  • Amgen (United States) (US)
Corresponding author
  • Haldar, Saptarsi M.
  • Srivastava, Deepak
Venue
Nature
Published
2021-06-23
Volume
595
Issue
7867
Pages
438-443
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W3176137376
Cited by
238
References
53
Citations by year
2026: 43 · 2025: 48 · 2024: 47 · 2023: 39 · 2022: 45 · 2021: 13 · 2020: 3
FWCI
24.11
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Science Foundation
  • American Heart Association (18POST34080175, 16SFRN31400013)
  • A.P. Giannini Foundation (P0527061)
  • Tobacco-Related Disease Research Program (578649)
  • Gladstone Institutes
  • Giannini Foundation of Agricultural Economics (P0527061)
  • Roddenberry Foundation
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (186704)
  • National Institutes of Health (16SFRN31400013, P01 HL098707, 1c06rr018928-01, HL146366, HL098179)
  • Agency for Healthcare Research and Quality (R01HS015100)
  • National Heart, Lung, and Blood Institute (F32HL147463, R01HL147558, R01HL116848, R01HL139783, P01HL146366, UM1HL098179, R01HL150100, P01HL089707, R01HL127240, R01HL150521, U01HL098179, R01HL150225, R01HL057181, K08HL157700)
  • National Institute of Mental Health (R01MH123178)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK119594)
  • National Center for Research Resources (C06-RR-018928, RR018928)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Fibrosis and Remodeling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Congenital heart defects research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
Keywords
fibroblast activation, cardiac fibroblasts, BET proteins, MEOX1, transcriptional switch, chromatin accessibility, enhancers, TGF-beta signaling, myocardial fibrosis, cardiac dysfunction, fibrotic diseases, BET inhibitors, cis-regulatory elements, single-cell epigenomics
MeSH terms
Bromodomain Containing Proteins, Animals, Chromatin, Enhancer Elements, Genetic, Fibroblasts, Gene Expression Regulation, Heart Diseases, Humans, Proteins, Transcription Factors, Transforming Growth Factor beta, Homeodomain Proteins, Mice, Epigenomics, Single-Cell Analysis, Transcriptome

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