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Updated: May 2, 2026
Isolation, Culture, and Functional Characterization of Adult Mouse Cardiomyoctyes
Published on: September 24, 2013
Calponin1 inhibits dilated cardiomyopathy development in mice through the εPKC pathway
1Key Laboratory of Human Disease Comparative Medicine, Ministry of Health, Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Comparative Medical Center, Peking Union Medical College, China.
Background:
Calponin1 (CNN1) is involved in the regulation of smooth muscle contraction in physiological situation and it also expresses abnormally in a variety of pathological situations. We found that the expression of CNN1 decreased significantly in the heart tissue of a cTnT(R141W) transgenic dilated cardiomyopathy (DCM) mouse model and an adriamycin (ADR)-induced DCM mouse model, suggesting that CNN1 is involved in the pathogenesis of DCM. However, the role of CNN1 on cardiac function, especially on pathogenesis of DCM, has not been clarified. In this study, we tested whether rescued expression of CNN1 could prevent the development of DCM and investigated its possible mechanisms.
Methods And Results:
The DCM phenotypes were significantly improved with the transgenic expression of CNN1 in the cTnT(R141W)×CNN1 double transgenic (DTG) mice, which was demonstrated by the survival, cardiac geometry and function analyses, as well as microstructural and ultrastructural observations based on echocardiography and histology examination. The expression of CNN1 could also resist the cardiac geometry breakage and dysfunction in the ADR-induced DCM mice model. Meanwhile, the epsilon isoform of protein kinase C (εPKC) activator and inhibitor could reverse the activation of εPKC/ERK/mTOR pathway and DCM phenotypes in the cTnT(R141W) and cTnT(R141W)×CNN1 double transgenic (DTG) mice.
Conclusions:
εPKC/ERK/mTOR pathway activation induced by the rescued expression of CNN1 contributed to the improvement of cardiac dysfunction and pathological changes observed in the DTG mice. CNN1 could be a therapeutic target to prevent the development of DCM and heart failure (HF).
Insights
Rescuing Calponin1 (CNN1) expression improved cardiac function in mouse models of dilated cardiomyopathy (DCM). This suggests CNN1 is a potential therapeutic target for preventing DCM and heart failure.
Area of Science:
- Cardiology
- Molecular Biology
- Biochemistry
Background:
- Calponin1 (CNN1) regulates smooth muscle contraction and is implicated in various pathologies.
- CNN1 expression is significantly reduced in mouse models of dilated cardiomyopathy (DCM).
- The precise role of CNN1 in cardiac function and DCM pathogenesis requires further elucidation.
Purpose of the Study:
- To investigate whether restoring CNN1 expression can prevent DCM development.
- To explore the underlying mechanisms by which CNN1 influences cardiac function in DCM.
Main Methods:
- Utilized cTnT(R141W)×CNN1 double transgenic (DTG) mice to assess rescued CNN1 expression.
- Employed adriamycin (ADR)-induced DCM mouse model to evaluate CNN1's protective effects.
- Analyzed cardiac geometry, function, survival rates, and microstructural changes via echocardiography and histology.
- Investigated the role of the epsilon isoform of protein kinase C (εPKC)/ERK/mTOR pathway.
Main Results:
- Transgenic CNN1 expression significantly improved survival, cardiac geometry, and function in DTG mice.
- CNN1 expression protected against cardiac structural damage and dysfunction in ADR-induced DCM mice.
- Modulation of εPKC activity reversed DCM phenotypes and pathway activation in DTG mice.
Conclusions:
- Restored CNN1 expression ameliorates cardiac dysfunction and pathological changes in DCM.
- The εPKC/ERK/mTOR pathway is activated by rescued CNN1 expression, contributing to improved cardiac outcomes.
- CNN1 represents a promising therapeutic target for preventing DCM and heart failure.
