The δc isoform of CaMKII is activated in cardiac hypertrophy and induces dilated cardiomyopathy and heart failure

Tong Zhang, Lars S. Maier, Nancy D. Dalton, Shigeki Miyamoto, John Ross, Donald M Bers, Joan Heller Brown

Research output: Contribution to journalArticle

403 Citations (Scopus)

Abstract

Recent studies have demonstrated that transgenic (TG) expression of either Ca2+/calmodulin-dependent protein kinase IV (CaMKIV) or CaMKIIδB, both of which localize to the nucleus, induces cardiac hypertrophy. However, CaMKIV is not present in heart, and cardiomyocytes express not only the nuclear CaMKIIδB but also a cytoplasmic isoform, CaMKIIδC. In the present study, we demonstrate that expression of the δC isoform of CaMKII is selectively increased and its phosphorylation elevated as early as 2 days and continuously for up to 7 days after pressure overload. To determine whether enhanced activity of this cytoplasmic δC isoform of CaMKII can lead to phosphorylation of Ca2+ regulatory proteins and induce hypertrophy, we generated TG mice that expressed the δC isoform of CaMKII. Immunocytochemical staining demonstrated that the expressed transgene is confined to the cytoplasm of cardiomyocytes isolated from these mice. These mice develop a dilated cardiomyopathy with up to a 65% decrease in fractional shortening and die prematurely. Isolated myocytes are enlarged and exhibit reduced contractility and altered Ca2+ handling. Phosphorylation of the ryanodine receptor (RyR) at a CaMKII site is increased even before development of heart failure, and CaMKII is found associated with the RyR in immunoprecipitates from the CaMKII TG mice. Phosphorylation of phospholamban is also increased specifically at the CaMKII but not at the PKA phosphorylation site. These findings are the first to demonstrate that CaMKIIδC can mediate phosphorylation of Ca2+ regulatory proteins in vivo and provide evidence for the involvement of CaMKIIδC activation in the pathogenesis of dilated cardiomyopathy and heart failure.

Original languageEnglish (US)
Pages (from-to)912-919
Number of pages8
JournalCirculation Research
Volume92
Issue number8
DOIs
StatePublished - May 2 2003
Externally publishedYes

Fingerprint

Calcium-Calmodulin-Dependent Protein Kinase Type 2
Dilated Cardiomyopathy
Cardiomegaly
Protein Isoforms
Heart Failure
Phosphorylation
Calcium-Calmodulin-Dependent Protein Kinase Type 4
Ryanodine Receptor Calcium Release Channel
Cardiac Myocytes
Transgenic Mice
Transgenes
Muscle Cells
Hypertrophy
Cytoplasm
Proteins
Staining and Labeling
Pressure

Keywords

  • Ca/calmodulin-dependent protein kinase
  • Dilated cardiomyopathy
  • Heart failure
  • Transgenic mice

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

The δc isoform of CaMKII is activated in cardiac hypertrophy and induces dilated cardiomyopathy and heart failure. / Zhang, Tong; Maier, Lars S.; Dalton, Nancy D.; Miyamoto, Shigeki; Ross, John; Bers, Donald M; Brown, Joan Heller.

In: Circulation Research, Vol. 92, No. 8, 02.05.2003, p. 912-919.

Research output: Contribution to journalArticle

Zhang, Tong ; Maier, Lars S. ; Dalton, Nancy D. ; Miyamoto, Shigeki ; Ross, John ; Bers, Donald M ; Brown, Joan Heller. / The δc isoform of CaMKII is activated in cardiac hypertrophy and induces dilated cardiomyopathy and heart failure. In: Circulation Research. 2003 ; Vol. 92, No. 8. pp. 912-919.
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AU - Maier, Lars S.

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AU - Bers, Donald M

AU - Brown, Joan Heller

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