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Transverse aortic constriction-induced heart failure leads to increased levels of circulating microparticles

Philipp Pfeifer1, Andreas Zietzer1, Marion Hölscher1

  • 1University Hospital Bonn Clinic II of Cardiology Angiology and Pulmonology, Germany.

International Journal of Cardiology
|November 12, 2021
PubMed
Abstract

Insights

New heart failure triggers a temporary surge in circulating microparticles, primarily from lymphocytes, influencing disease progression. This finding offers potential therapeutic targets for early heart failure intervention.

Area of Science:

  • Cardiovascular Biology
  • Cellular Signaling
  • Biomarker Discovery

Background:

  • Circulating microparticles mediate intercellular communication.
  • Elevated microparticle levels are observed in heart failure patients.
  • The precise composition and temporal dynamics of microparticles in heart failure remain unclear.

Purpose of the Study:

  • To investigate the temporal occurrence and composition of circulating microparticles following the induction of heart failure.
  • To identify the cellular origins and molecular cargo of microparticles during early heart failure.
  • To explore the potential therapeutic relevance of these findings.

Main Methods:

  • Quantification of circulating microparticles using flow cytometry in a mouse model of heart failure (TAC).
  • Characterization of microparticles via nanoparticle tracking analysis (NTA) and immunoblotting for Flotillin-1.
  • Analysis of microparticle content, including specific microRNAs (miRNAs), using molecular assays.

Main Results:

  • Successful induction of heart failure in mice was confirmed post-TAC.
  • A transient increase in circulating microparticles was observed within the first week after TAC, followed by a decline.
  • Lymphocyte-derived extracellular vesicles (EVs) constituted a significant fraction, carrying has-miR-26a-5p and has-miR-146b-5p, known to be involved in inflammation.

Conclusions:

  • This study reveals a previously unrecognized, time-limited increase in circulating microparticles after the onset of heart failure.
  • These microparticles may play a crucial role in the development and progression of heart failure.
  • The findings suggest potential therapeutic applications targeting these early molecular events.
Keywords:
Cardiac hypertrophyHeart failureMicroparticlesTAC

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