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Updated: May 17, 2025

Suppression of Pro-fibrotic Signaling Potentiates Factor-mediated Reprogramming of Mouse Embryonic Fibroblasts into Induced Cardiomyocytes
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Thymosin Beta-4 Modulates Cardiac Remodeling by Regulating ROCK1 Expression in Adult Mammals.

Klaudia Maar1, Jeffrey E Thatcher2, Egor Karpov1

  • 1Department of Biochemistry and Medical Chemistry, University of Pecs Medical School, 7624 Pecs, Hungary.

International Journal of Molecular Sciences
|May 14, 2025
PubMed
Summary
This summary is machine-generated.

Thymosin beta-4 (TB4) peptide may reduce heart scarring after myocardial infarction by modulating ROCK1 protein levels. This finding suggests TB4 could be a future therapeutic ROCK1 inhibitor for cardiac repair.

Keywords:
ROCK1cardiac regenerationmiR139-5pthymosin beta-4

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Area of Science:

  • Cardiovascular Research
  • Molecular Biology
  • Regenerative Medicine

Background:

  • Myocardial infarction (MI) leads to significant cardiac damage and scarring.
  • Current research struggles to fully achieve post-hypoxic myocardial regeneration.
  • Thymosin beta-4 (TB4) shows promise in improving outcomes after MI, but its mechanisms are unclear.

Purpose of the Study:

  • To identify molecular mechanisms behind TB4's beneficial effects on infarcted hearts.
  • To investigate TB4's role in mitigating pathological cardiac scarring.
  • To explore novel molecular contributors to TB4-mediated cardiac remodeling.

Main Methods:

  • miRNA profiling in adult mouse hearts post-coronary ligation with/without TB4.
  • Identification and validation of potential TB4 targets, including ROCK1.
  • In vivo and in vitro experiments using real-time PCR, Western blot, and immunostaining.

Main Results:

  • Significant increase in miR139-5p expression observed with TB4 treatment.
  • ROCK1 identified as a key target protein modulated by TB4.
  • TB4 demonstrated ability to inhibit fibroblast-to-myofibroblast transformation.

Conclusions:

  • TB4 influences cardiac remodeling post-MI, partly through ROCK1 modulation.
  • TB4 may act as a ROCK1 inhibitor, offering therapeutic potential.
  • The cell-specific downstream effects of TB4 via ROCK1 warrant further investigation.