Protein kinase C-mediated desmin phosphorylation is related to myofibril disarray in cardiomyopathic hamster heart

Xupei Huang, Jian Li, Dalton Foster, Sharon L. Lemanski, Dipak K. Dube, Chi Zhang, Larry F. Lemanski

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The cardiomyopathic (CM) Syrian golden hamster (strain UM-X7.1) exhibits a hereditary cardiomyopathy, which causes premature death resulting from congestive heart failure. The CM animals show extensive cardiac myofibril disarray and myocardial calcium overload. The present study has been undertaken to examine the role of desmin phosphorylation in myofibril disarray observed in CM hearts. The data from skinned myofibril protein phosphorylation assays have shown that desmin can be phosphorylated by protein kinase C (PKC). There is no significant difference in the content of desmin between CM and control hamster hearts. However, the desmin from CM hearts has a higher phosphorylation level than that of the normal hearts. Furthermore, we have examined the distribution of desmin and myofibril organization with immunofluorescent microscopy and immunogold electron microscopy in cultured cardiac myocytes after treatment with the PKC-activating phorbol ester, 12-O-tetradecanylphorbol-13-acetate (TPA). When the cultured normal hamster cardiac cells are treated with TPA, desmin filaments are disassembled and the myofibrils become disarrayed. The myofibril disarray closely mimics that observed in untreated CM cultures. These results suggest that disassembly of desmin filaments, which could be caused by PKC-mediated phosphorylation, may be a factor in myofibril disarray in cardiomyopathic cells and that the intermediate filament protein, desmin, plays an important role in maintaining myofibril alignment in cardiac cells.

Original languageEnglish
Pages (from-to)1039-1046
Number of pages8
JournalExperimental Biology and Medicine
Volume227
Issue number11
StatePublished - Dec 1 2002
Externally publishedYes

Fingerprint

Phosphorylation
Desmin
Myofibrils
Cricetinae
Protein Kinase C
Acetates
Intermediate Filament Proteins
Premature Mortality
Mesocricetus
Phorbol Esters
Cardiomyopathies
Cardiac Myocytes
Electron microscopy
Cause of Death
Microscopy
Assays
Electron Microscopy
Microscopic examination
Animals
Heart Failure

Keywords

  • Cardiac hypertrophy
  • Cell culture
  • Intermediate filaments
  • Myocardium
  • Myofibril protein

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

Huang, X., Li, J., Foster, D., Lemanski, S. L., Dube, D. K., Zhang, C., & Lemanski, L. F. (2002). Protein kinase C-mediated desmin phosphorylation is related to myofibril disarray in cardiomyopathic hamster heart. Experimental Biology and Medicine, 227(11), 1039-1046.

Protein kinase C-mediated desmin phosphorylation is related to myofibril disarray in cardiomyopathic hamster heart. / Huang, Xupei; Li, Jian; Foster, Dalton; Lemanski, Sharon L.; Dube, Dipak K.; Zhang, Chi; Lemanski, Larry F.

In: Experimental Biology and Medicine, Vol. 227, No. 11, 01.12.2002, p. 1039-1046.

Research output: Contribution to journalArticle

Huang, X, Li, J, Foster, D, Lemanski, SL, Dube, DK, Zhang, C & Lemanski, LF 2002, 'Protein kinase C-mediated desmin phosphorylation is related to myofibril disarray in cardiomyopathic hamster heart', Experimental Biology and Medicine, vol. 227, no. 11, pp. 1039-1046.
Huang, Xupei ; Li, Jian ; Foster, Dalton ; Lemanski, Sharon L. ; Dube, Dipak K. ; Zhang, Chi ; Lemanski, Larry F. / Protein kinase C-mediated desmin phosphorylation is related to myofibril disarray in cardiomyopathic hamster heart. In: Experimental Biology and Medicine. 2002 ; Vol. 227, No. 11. pp. 1039-1046.
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