Amplified pathogenic actions of angiotensin II in cysteine-rich LIM-only protein 4-negative mouse hearts
Related Experiment Video
Updated: Mar 8, 2026
Subcutaneous Angiotensin II Infusion using Osmotic Pumps Induces Aortic Aneurysms in Mice
Published on: September 28, 2015
Julia Straubinger1, Karsten Boldt2, Anna Kuret1
1Department of Pharmacology, Toxicology, and Clinical Pharmacy, Institute of Pharmacy, University of Tübingen, Tübingen, Germany.
Insights
Cysteine-rich LIM-only protein 4 (CRP4) is crucial for normal heart function. Its absence amplifies angiotensin II (Ang II) effects, leading to cardiac defects and impaired development.
Area of Science:
- Cardiovascular Biology
- Molecular Cardiology
- Protein Function
Background:
- LIM domain proteins are key regulators of cardiac function and disease.
- The specific role of cysteine-rich LIM-only protein 4 (CRP4) in cardiac processes remains largely undefined.
Purpose of the Study:
- To investigate the function of CRP4 in cardiac biology and its response to stress.
- To elucidate the molecular mechanisms underlying CRP4's role in cardiac health and pathology.
Main Methods:
- Utilized CRP4 mutant mice to assess cardiac development and stress response.
- Analyzed the link between CRP4, the cGMP pathway, and cardiac hypertrophy factors.
- Examined cysteine-rich intestinal protein 1 (CRIP1) expression in CRP4-deficient hearts.
- Studied zebrafish embryos with depleted CRP1 and CRP4.
Main Results:
- CRP4 mutant mice exhibited normal heart development but exaggerated cardiac stress response to angiotensin II (Ang II).
- A connection between CRP4 and the cardioprotective cGMP pathway was identified.
- Enrichment of CRIP1 was observed in CRP4-deficient murine hearts.
- Depletion of CRP1 and CRP4 in zebrafish embryos led to severe cardiac defects and premature death.
Conclusions:
- CRP4 acts as a novel antiremodeling factor, mitigating the adverse effects of Ang II.
- Cardiac cGMP signaling pathways are involved in CRP4 regulation.
- Absence of CRP4 significantly impairs cardiac development and function, highlighting its critical role.
Abstract:
LIM domain proteins have been identified as essential modulators of cardiac biology and pathology; however, it is unclear which role the cysteine-rich LIM-only protein (CRP)4 plays in these processes. In studying CRP4 mutant mice, we found that their hearts developed normally, but lack of CRP4 exaggerated multiple parameters of the cardiac stress response to the neurohormone angiotensin II (Ang II). Aiming to dissect the molecular details, we found a link between CRP4 and the cardioprotective cGMP pathway, as well as a multiprotein complex comprising well-known hypertrophy-associated factors. Significant enrichment of the cysteine-rich intestinal protein (CRIP)1 in murine hearts lacking CRP4, as well as severe cardiac defects and premature death of CRIP1 and CRP4 morphant zebrafish embryos, further support the notion that depleting CRP4 is incompatible with a proper cardiac development and function. Together, amplified Ang II signaling identified CRP4 as a novel antiremodeling factor regulated, at least to some extent, by cardiac cGMP.-Straubinger, J., Boldt, K., Kuret, A., Deng, L., Krattenmacher, D., Bork, N., Desch, M., Feil, R., Feil, S., Nemer, M., Ueffing, M., Ruth, P., Just, S., Lukowski, R. Amplified pathogenic actions of angiotensin II in cysteine-rich LIM-only protein 4 negative mouse hearts.
Related Concept Videos
01:26Heart Failure Drugs: Inhibitors of Renin-Angiotensin System
01:29Heart Failure II: Pathophysiology