Loss of PKC-delta alters cardiac metabolism

Am J Physiol Heart Circ Physiol. 2004 Aug;287(2):H937-45. doi: 10.1152/ajpheart.00877.2003.


PKC-delta is believed to play an essential role in cardiomyocyte growth. In the present study, we investigated the effect of PKC-delta on cardiac metabolism using PKC-delta knockout mice generated in our laboratories. Proteomic analysis of heart protein extracts revealed profound changes in enzymes related to energy metabolism: certain isoforms of glycolytic enzymes, e.g., lactate dehydrogenase and pyruvate kinase, were absent or decreased, whereas several enzymes involved in lipid metabolism, e.g., phosphorylated isoforms of acyl-CoA dehydrogenases, showed a marked increase in PKC-delta(-/-) hearts. Moreover, PKC-delta deficiency was associated with changes in antioxidants, namely, 1-Cys peroxiredoxin and selenium-binding protein 1, and posttranslational modifications of chaperones involved in cytoskeleton regulation, such as heat shock protein (HSP)20, HSP27, and the zeta-subunit of the cytosolic chaperone containing the T-complex polypeptide 1. High-resolution NMR analysis of cardiac metabolites confirmed a significant decrease in the ratio of glycolytic end products (alanine + lactate) to end products of lipid metabolism (acetate) in PKC-delta(-/-) hearts. Taken together, our data demonstrate that loss of PKC-delta causes a shift from glucose to lipid metabolism in murine hearts, and we provide a detailed description of the enzymatic changes on a proteomic level. The consequences of these metabolic alterations on sensitivity to myocardial ischemia are further explored in the accompanyingpaper (20).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Magnetic Resonance Spectroscopy
  • Mice
  • Mice, Knockout
  • Molecular Chaperones / metabolism
  • Myocardium / enzymology
  • Myocardium / metabolism*
  • Peroxidases / metabolism
  • Peroxiredoxins
  • Protein Kinase C / deficiency
  • Protein Kinase C / physiology*
  • Protein Kinase C-delta
  • Proteome / metabolism


  • Molecular Chaperones
  • Proteome
  • Peroxidases
  • Peroxiredoxins
  • Prkcd protein, mouse
  • Protein Kinase C
  • Protein Kinase C-delta