Calpain inhibition in a transgenic model of calpastatin overexpression facilitates reversal of myocardial hypertrophy

Aims It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a truncated calcineurin fragment that is a strong inductor of myocardial hypertrophy. We now address the question of whether inhibition of calpain...

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Vydané v:ESC Heart Failure Ročník 12; číslo 3; s. 2256 - 2266
Hlavní autori: Sachse, Gregor, Tennigkeit, Johanna, Pagonas, Nikolaos, Hillmeister, Philipp, Buschmann, Ivo, Czolbe, Martin, Nordbeck, Peter, Schmitt, Joachim, Patschan, Daniel, Ritter, Oliver
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: England John Wiley & Sons, Inc 01.06.2025
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ISSN:2055-5822, 2055-5822
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Abstract Aims It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a truncated calcineurin fragment that is a strong inductor of myocardial hypertrophy. We now address the question of whether inhibition of calpain function in cardiomyocytes, and thereby prevention of calcineurin truncation, attenuates development of myocardial hypertrophy. Methods and results We generated a transgenic mouse model with conditional cardiac calpastatin overexpression (CAST OE) and compared their cardiac hypertrophic response to angiotensin‐II (AngII) with that of non‐induced control animals. Angiotensin‐II osmotic mini‐pumps were removed 3 weeks after implantation and cardiac hypertrophy was re‐evaluated 3 weeks after pump removal. Induction of calpastatin overexpression resulted in 88% inhibition of calpain activity and suppressed calcineurin truncation. In CAST OE mice, basal phenotype and AngII‐induced myocardial hypertrophy were comparable with non‐induced controls (mean heart to body weight ratios ± SD in milligrams per gram: CAST OE, 4.8 ± 0.4; CAST OE + AngII, 7.1 ± 0.5; non‐induced, 4.9 ± 0.4; non‐induced + AngII, 7.2 ± 0.4). However, CAST OE mice demonstrated a complete reversal of hypertrophy when angiotensin‐II was removed, whereas hypertrophy persisted in non‐induced controls (CAST OE 5.0 ± 0.5; non‐induced 7.0 ± 0.4; P < 0.0001). Persistent hypertrophy in controls was accompanied by nuclear accumulation of truncated calcineurin and elevated activity of the Nuclear Factor of Activated T‐cells pathway. Moreover, we found that truncated calcineurin was insufficiently ubiquitinylated compared with its full‐length form and thus escaped degradation over several weeks in our in vivo experiments. Conclusions Our data demonstrate that calpain‐mediated cleavage results in nuclear accumulation of a truncated, constitutively active and degradation‐resistant calcineurin isoform that sustains a long‐term myocardial hypertrophic response to angiotensin‐II beyond withdrawal of the stimulus. Cardiomyocyte specific calpain inhibition by transgenic calpastatin overexpression prevented the post‐stimulus myocardial hypertrophic response.
AbstractList Abstract Aims It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a truncated calcineurin fragment that is a strong inductor of myocardial hypertrophy. We now address the question of whether inhibition of calpain function in cardiomyocytes, and thereby prevention of calcineurin truncation, attenuates development of myocardial hypertrophy. Methods and results We generated a transgenic mouse model with conditional cardiac calpastatin overexpression (CAST OE) and compared their cardiac hypertrophic response to angiotensin‐II (AngII) with that of non‐induced control animals. Angiotensin‐II osmotic mini‐pumps were removed 3 weeks after implantation and cardiac hypertrophy was re‐evaluated 3 weeks after pump removal. Induction of calpastatin overexpression resulted in 88% inhibition of calpain activity and suppressed calcineurin truncation. In CAST OE mice, basal phenotype and AngII‐induced myocardial hypertrophy were comparable with non‐induced controls (mean heart to body weight ratios ± SD in milligrams per gram: CAST OE, 4.8 ± 0.4; CAST OE + AngII, 7.1 ± 0.5; non‐induced, 4.9 ± 0.4; non‐induced + AngII, 7.2 ± 0.4). However, CAST OE mice demonstrated a complete reversal of hypertrophy when angiotensin‐II was removed, whereas hypertrophy persisted in non‐induced controls (CAST OE 5.0 ± 0.5; non‐induced 7.0 ± 0.4; P < 0.0001). Persistent hypertrophy in controls was accompanied by nuclear accumulation of truncated calcineurin and elevated activity of the Nuclear Factor of Activated T‐cells pathway. Moreover, we found that truncated calcineurin was insufficiently ubiquitinylated compared with its full‐length form and thus escaped degradation over several weeks in our in vivo experiments. Conclusions Our data demonstrate that calpain‐mediated cleavage results in nuclear accumulation of a truncated, constitutively active and degradation‐resistant calcineurin isoform that sustains a long‐term myocardial hypertrophic response to angiotensin‐II beyond withdrawal of the stimulus. Cardiomyocyte specific calpain inhibition by transgenic calpastatin overexpression prevented the post‐stimulus myocardial hypertrophic response.
Aims It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a truncated calcineurin fragment that is a strong inductor of myocardial hypertrophy. We now address the question of whether inhibition of calpain function in cardiomyocytes, and thereby prevention of calcineurin truncation, attenuates development of myocardial hypertrophy. Methods and results We generated a transgenic mouse model with conditional cardiac calpastatin overexpression (CAST OE) and compared their cardiac hypertrophic response to angiotensin‐II (AngII) with that of non‐induced control animals. Angiotensin‐II osmotic mini‐pumps were removed 3 weeks after implantation and cardiac hypertrophy was re‐evaluated 3 weeks after pump removal. Induction of calpastatin overexpression resulted in 88% inhibition of calpain activity and suppressed calcineurin truncation. In CAST OE mice, basal phenotype and AngII‐induced myocardial hypertrophy were comparable with non‐induced controls (mean heart to body weight ratios ± SD in milligrams per gram: CAST OE, 4.8 ± 0.4; CAST OE + AngII, 7.1 ± 0.5; non‐induced, 4.9 ± 0.4; non‐induced + AngII, 7.2 ± 0.4). However, CAST OE mice demonstrated a complete reversal of hypertrophy when angiotensin‐II was removed, whereas hypertrophy persisted in non‐induced controls (CAST OE 5.0 ± 0.5; non‐induced 7.0 ± 0.4; P < 0.0001). Persistent hypertrophy in controls was accompanied by nuclear accumulation of truncated calcineurin and elevated activity of the Nuclear Factor of Activated T‐cells pathway. Moreover, we found that truncated calcineurin was insufficiently ubiquitinylated compared with its full‐length form and thus escaped degradation over several weeks in our in vivo experiments. Conclusions Our data demonstrate that calpain‐mediated cleavage results in nuclear accumulation of a truncated, constitutively active and degradation‐resistant calcineurin isoform that sustains a long‐term myocardial hypertrophic response to angiotensin‐II beyond withdrawal of the stimulus. Cardiomyocyte specific calpain inhibition by transgenic calpastatin overexpression prevented the post‐stimulus myocardial hypertrophic response.
It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a truncated calcineurin fragment that is a strong inductor of myocardial hypertrophy. We now address the question of whether inhibition of calpain function in cardiomyocytes, and thereby prevention of calcineurin truncation, attenuates development of myocardial hypertrophy. We generated a transgenic mouse model with conditional cardiac calpastatin overexpression (CAST OE) and compared their cardiac hypertrophic response to angiotensin-II (AngII) with that of non-induced control animals. Angiotensin-II osmotic mini-pumps were removed 3 weeks after implantation and cardiac hypertrophy was re-evaluated 3 weeks after pump removal. Induction of calpastatin overexpression resulted in 88% inhibition of calpain activity and suppressed calcineurin truncation. In CAST OE mice, basal phenotype and AngII-induced myocardial hypertrophy were comparable with non-induced controls (mean heart to body weight ratios ± SD in milligrams per gram: CAST OE, 4.8 ± 0.4; CAST OE + AngII, 7.1 ± 0.5; non-induced, 4.9 ± 0.4; non-induced + AngII, 7.2 ± 0.4). However, CAST OE mice demonstrated a complete reversal of hypertrophy when angiotensin-II was removed, whereas hypertrophy persisted in non-induced controls (CAST OE 5.0 ± 0.5; non-induced 7.0 ± 0.4; P < 0.0001). Persistent hypertrophy in controls was accompanied by nuclear accumulation of truncated calcineurin and elevated activity of the Nuclear Factor of Activated T-cells pathway. Moreover, we found that truncated calcineurin was insufficiently ubiquitinylated compared with its full-length form and thus escaped degradation over several weeks in our in vivo experiments. Our data demonstrate that calpain-mediated cleavage results in nuclear accumulation of a truncated, constitutively active and degradation-resistant calcineurin isoform that sustains a long-term myocardial hypertrophic response to angiotensin-II beyond withdrawal of the stimulus. Cardiomyocyte specific calpain inhibition by transgenic calpastatin overexpression prevented the post-stimulus myocardial hypertrophic response.
It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a truncated calcineurin fragment that is a strong inductor of myocardial hypertrophy. We now address the question of whether inhibition of calpain function in cardiomyocytes, and thereby prevention of calcineurin truncation, attenuates development of myocardial hypertrophy.AIMSIt was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a truncated calcineurin fragment that is a strong inductor of myocardial hypertrophy. We now address the question of whether inhibition of calpain function in cardiomyocytes, and thereby prevention of calcineurin truncation, attenuates development of myocardial hypertrophy.We generated a transgenic mouse model with conditional cardiac calpastatin overexpression (CAST OE) and compared their cardiac hypertrophic response to angiotensin-II (AngII) with that of non-induced control animals. Angiotensin-II osmotic mini-pumps were removed 3 weeks after implantation and cardiac hypertrophy was re-evaluated 3 weeks after pump removal. Induction of calpastatin overexpression resulted in 88% inhibition of calpain activity and suppressed calcineurin truncation. In CAST OE mice, basal phenotype and AngII-induced myocardial hypertrophy were comparable with non-induced controls (mean heart to body weight ratios ± SD in milligrams per gram: CAST OE, 4.8 ± 0.4; CAST OE + AngII, 7.1 ± 0.5; non-induced, 4.9 ± 0.4; non-induced + AngII, 7.2 ± 0.4). However, CAST OE mice demonstrated a complete reversal of hypertrophy when angiotensin-II was removed, whereas hypertrophy persisted in non-induced controls (CAST OE 5.0 ± 0.5; non-induced 7.0 ± 0.4; P < 0.0001). Persistent hypertrophy in controls was accompanied by nuclear accumulation of truncated calcineurin and elevated activity of the Nuclear Factor of Activated T-cells pathway. Moreover, we found that truncated calcineurin was insufficiently ubiquitinylated compared with its full-length form and thus escaped degradation over several weeks in our in vivo experiments.METHODS AND RESULTSWe generated a transgenic mouse model with conditional cardiac calpastatin overexpression (CAST OE) and compared their cardiac hypertrophic response to angiotensin-II (AngII) with that of non-induced control animals. Angiotensin-II osmotic mini-pumps were removed 3 weeks after implantation and cardiac hypertrophy was re-evaluated 3 weeks after pump removal. Induction of calpastatin overexpression resulted in 88% inhibition of calpain activity and suppressed calcineurin truncation. In CAST OE mice, basal phenotype and AngII-induced myocardial hypertrophy were comparable with non-induced controls (mean heart to body weight ratios ± SD in milligrams per gram: CAST OE, 4.8 ± 0.4; CAST OE + AngII, 7.1 ± 0.5; non-induced, 4.9 ± 0.4; non-induced + AngII, 7.2 ± 0.4). However, CAST OE mice demonstrated a complete reversal of hypertrophy when angiotensin-II was removed, whereas hypertrophy persisted in non-induced controls (CAST OE 5.0 ± 0.5; non-induced 7.0 ± 0.4; P < 0.0001). Persistent hypertrophy in controls was accompanied by nuclear accumulation of truncated calcineurin and elevated activity of the Nuclear Factor of Activated T-cells pathway. Moreover, we found that truncated calcineurin was insufficiently ubiquitinylated compared with its full-length form and thus escaped degradation over several weeks in our in vivo experiments.Our data demonstrate that calpain-mediated cleavage results in nuclear accumulation of a truncated, constitutively active and degradation-resistant calcineurin isoform that sustains a long-term myocardial hypertrophic response to angiotensin-II beyond withdrawal of the stimulus. Cardiomyocyte specific calpain inhibition by transgenic calpastatin overexpression prevented the post-stimulus myocardial hypertrophic response.CONCLUSIONSOur data demonstrate that calpain-mediated cleavage results in nuclear accumulation of a truncated, constitutively active and degradation-resistant calcineurin isoform that sustains a long-term myocardial hypertrophic response to angiotensin-II beyond withdrawal of the stimulus. Cardiomyocyte specific calpain inhibition by transgenic calpastatin overexpression prevented the post-stimulus myocardial hypertrophic response.
Aims It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a truncated calcineurin fragment that is a strong inductor of myocardial hypertrophy. We now address the question of whether inhibition of calpain function in cardiomyocytes, and thereby prevention of calcineurin truncation, attenuates development of myocardial hypertrophy. Methods and results We generated a transgenic mouse model with conditional cardiac calpastatin overexpression (CAST OE) and compared their cardiac hypertrophic response to angiotensin‐II (AngII) with that of non‐induced control animals. Angiotensin‐II osmotic mini‐pumps were removed 3 weeks after implantation and cardiac hypertrophy was re‐evaluated 3 weeks after pump removal. Induction of calpastatin overexpression resulted in 88% inhibition of calpain activity and suppressed calcineurin truncation. In CAST OE mice, basal phenotype and AngII‐induced myocardial hypertrophy were comparable with non‐induced controls (mean heart to body weight ratios ± SD in milligrams per gram: CAST OE, 4.8 ± 0.4; CAST OE + AngII, 7.1 ± 0.5; non‐induced, 4.9 ± 0.4; non‐induced + AngII, 7.2 ± 0.4). However, CAST OE mice demonstrated a complete reversal of hypertrophy when angiotensin‐II was removed, whereas hypertrophy persisted in non‐induced controls (CAST OE 5.0 ± 0.5; non‐induced 7.0 ± 0.4; P < 0.0001). Persistent hypertrophy in controls was accompanied by nuclear accumulation of truncated calcineurin and elevated activity of the Nuclear Factor of Activated T‐cells pathway. Moreover, we found that truncated calcineurin was insufficiently ubiquitinylated compared with its full‐length form and thus escaped degradation over several weeks in our in vivo experiments. Conclusions Our data demonstrate that calpain‐mediated cleavage results in nuclear accumulation of a truncated, constitutively active and degradation‐resistant calcineurin isoform that sustains a long‐term myocardial hypertrophic response to angiotensin‐II beyond withdrawal of the stimulus. Cardiomyocyte specific calpain inhibition by transgenic calpastatin overexpression prevented the post‐stimulus myocardial hypertrophic response.
Author Pagonas, Nikolaos
Buschmann, Ivo
Ritter, Oliver
Sachse, Gregor
Tennigkeit, Johanna
Hillmeister, Philipp
Nordbeck, Peter
Czolbe, Martin
Schmitt, Joachim
Patschan, Daniel
AuthorAffiliation 2 Brandenburg Medical School Neuruppin Germany
6 Comprehensive Heart Failure Center University Hospital Würzburg Würzburg Germany
8 Research Center Magnetic Resonance Bavaria Würzburg Germany
5 Department of Internal Medicine I—Cardiology University Hospital Würzburg Würzburg Germany
1 Department of Internal Medicine I University Hospital Brandenburg Brandenburg an der Havel Germany
7 Department of Experimental Physics V Julius‐Maximilians‐University Würzburg Germany
3 Faculty of Health Sciences Joint Faculty of the Brandenburg University of Technology Cottbus, MHB Theodor Fontane, University of Potsdam Senftenberg Germany
4 Department of Cardiology University Hospital Ruppin‐Brandenburg Neuruppin Germany
9 Institut für Pharmakologie und Toxikologie Universität Düsseldorf Düsseldorf Germany
AuthorAffiliation_xml – name: 7 Department of Experimental Physics V Julius‐Maximilians‐University Würzburg Germany
– name: 2 Brandenburg Medical School Neuruppin Germany
– name: 6 Comprehensive Heart Failure Center University Hospital Würzburg Würzburg Germany
– name: 1 Department of Internal Medicine I University Hospital Brandenburg Brandenburg an der Havel Germany
– name: 3 Faculty of Health Sciences Joint Faculty of the Brandenburg University of Technology Cottbus, MHB Theodor Fontane, University of Potsdam Senftenberg Germany
– name: 9 Institut für Pharmakologie und Toxikologie Universität Düsseldorf Düsseldorf Germany
– name: 4 Department of Cardiology University Hospital Ruppin‐Brandenburg Neuruppin Germany
– name: 5 Department of Internal Medicine I—Cardiology University Hospital Würzburg Würzburg Germany
– name: 8 Research Center Magnetic Resonance Bavaria Würzburg Germany
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  surname: Pagonas
  fullname: Pagonas, Nikolaos
  organization: University Hospital Ruppin‐Brandenburg
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  organization: Joint Faculty of the Brandenburg University of Technology Cottbus, MHB Theodor Fontane, University of Potsdam
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  fullname: Schmitt, Joachim
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  surname: Ritter
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  organization: Joint Faculty of the Brandenburg University of Technology Cottbus, MHB Theodor Fontane, University of Potsdam
BackLink https://www.ncbi.nlm.nih.gov/pubmed/40025327$$D View this record in MEDLINE/PubMed
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Issue 3
Keywords Heart failure
Signal transduction
Myocardial hypertrophy
Language English
License Attribution
2025 The Author(s). ESC Heart Failure published by John Wiley & Sons Ltd on behalf of European Society of Cardiology.
This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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Notes Gregor Sachse and Johanna Tennigkeit contributed equally to this work.
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PublicationTitle ESC Heart Failure
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Snippet Aims It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a...
It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a truncated...
Aims It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting in a...
Abstract Aims It was recently demonstrated that the intracellular signalling phosphatase calcineurin is subject to cleavage by the protease calpain, resulting...
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StartPage 2256
SubjectTerms Angiotensin II
Animals
Antibodies
Calcineurin - metabolism
Calcium-Binding Proteins - biosynthesis
Calcium-Binding Proteins - genetics
Calpain - antagonists & inhibitors
Calpain - metabolism
Cardiomegaly - genetics
Cardiomegaly - metabolism
Cardiomyocytes
Cloning
Disease Models, Animal
Heart failure
Magnetic resonance imaging
Mice
Mice, Transgenic
Myocardial hypertrophy
Myocytes, Cardiac - metabolism
Myocytes, Cardiac - pathology
Original
Proteins
Signal transduction
Statistical analysis
Transgenic animals
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Title Calpain inhibition in a transgenic model of calpastatin overexpression facilitates reversal of myocardial hypertrophy
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