What is the clinical evidence from this study?

Population: Myocardial fibrosis. Intervention: Soft extracellular matrix (ECM) vs. Stiff ECM or tissue culture plastic. Primary outcome: Cardiac fibroblast activation and a-smooth muscle actin (aSMA) expression.

What type of study is this?

This is a Quantitative Study study.

October 10, 2025Circulation Research

Abstract Thu144: Prolonged Cardiac Fibroblast Conditioning on Soft Matrix Maintains Quiescence but Permits Agonist-Mediated Myofibroblast Activation

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Key result

Softened matrix maintains cardiac fibroblast quiescence but epigenetically primes cells for enhanced agonist-induced activation.

Key Points

Prolonged exposure to soft substrates keeps cardiac fibroblasts in a quiescent state while allowing activation by myofibroblast agonists.
When replated on soft matrix, fibroblasts lose a-smooth muscle actin expression, indicating a shift from activation to quiescence.
Experimental data suggest that softer matrices enhance the transcriptional accessibility for myofibroblast activation through an epigenetic mechanism.
Understanding fibroblast behavior in varying matrix stiffness could provide insights for developing better in vitro models for cardiac health.

Structured PICO

Population

Pluripotent stem cell-derived cardiac fibroblasts

Intervention

Serial passaging on a range of extracellular matrix (ECM) stiffnesses, replating on soft or stiff ECM, and exposure to myofibroblast agonists or a histone deacetylase inhibitor

Comparator

Cultured on tissue culture plastic or stiff ECM

Outcome

Myofibroblast activation (a-smooth muscle actin expression) and epigenetic regulation (ATAC-seq accessibility)surrogate

Discussion

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Implication

Prolonged conditioning of cardiac fibroblasts on soft matrices maintains quiescence but epigenetically primes them for enhanced activation by myofibroblast agonists, highlighting the importance of mechanical memory.

Cite This Study

Bishop et al. (2025) studied Myocardial fibrosis. Soft extracellular matrix (ECM) vs. Stiff ECM or tissue culture plastic was evaluated on Cardiac fibroblast activation and a-smooth muscle actin (aSMA) expression. Culturing cardiac fibroblasts on softened matrix maintained quiescence but facilitated enhanced activation upon exposure to myofibroblast agonists via epigenetic regulation.

synapsesocial.com/papers/68e861a57ef2f04ca37e47be https://doi.org/10.1161/res.137.suppl_1.thu144

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