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Related Experiment Video

Updated: Jan 25, 2026

A Pulmonary Trunk Banding Model of Pressure Overload Induced Right Ventricular Hypertrophy and Failure
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Altered proteasome function in right ventricular hypertrophy.

Tanja Heitmeier1, Akylbek Sydykov1, Christina Lukas2

  • 1Universities of Giessen and Marburg Lung Center (UGMLC), Aulweg 130, 35392 Giessen, Germany.

Cardiovascular Research
|April 26, 2019
PubMed
Summary
This summary is machine-generated.

Right ventricular hypertrophy (RVH) involves altered proteasome activity, particularly the 26S proteasome. Targeting the Rpn6 subunit offers a specific therapeutic approach for RVH, distinct from general proteasome inhibitors.

Keywords:
ProteasomeProteasome inhibitionPulmonary artery bandingRight ventricular hypertrophyRpn6

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Area of Science:

  • Cardiovascular Biology
  • Molecular Medicine
  • Proteostasis

Background:

  • Right ventricular hypertrophy (RVH) is a severe condition linked to pulmonary hypertension, leading to heart failure.
  • The ubiquitin proteasome system's role in left heart remodeling is known, but its function in right heart hypertrophy remains unclear.

Purpose of the Study:

  • To investigate the role of the ubiquitin proteasome system in right ventricular hypertrophy (RVH).
  • To identify specific proteasome complexes and subunits involved in RVH.
  • To evaluate potential therapeutic targets for RVH.

Main Methods:

  • Induced RVH in mice using pulmonary artery banding (PAB).
  • Assessed proteasome expression and activity in hypertrophied right ventricles.
  • Utilized proteasome inhibitors (Bortezomib, ONX-0912) and native gel electrophoresis.
  • Examined Rpn6 subunit expression in mouse and human RVH samples via immunohistochemistry.

Main Results:

  • Proteasome expression and activity were upregulated in experimental RVH.
  • Specific activation of 26S proteasome complexes was observed in RVH.
  • Inhibition of proteasome activity partially ameliorated RVH.
  • Elevated Rpn6 expression was found in hypertrophied cardiomyocytes in both mice and human RVH patients.

Conclusions:

  • Proteasome subunit alterations are critical in RVH development.
  • The 26S proteasome is selectively activated in RVH, potentially driven by Rpn6.
  • Rpn6 represents a more specific therapeutic target for RVH than general proteasome inhibitors.