Cardiac titin and heart disease

Martin M. Lewinter, Henk L. Granzier

Research output: Contribution to journalReview article

64 Scopus citations

Abstract

ABSTRACT:: The giant sarcomeric protein titin is a key determinant of myocardial passive stiffness and stress-sensitive signaling. Titin stiffness is modulated by isoform variation, phosphorylation by protein kinases, and, possibly, oxidative stress through disulfide bond formation. Titin has also emerged as an important human disease gene. Early studies in patients with dilated cardiomyopathy (DCM) revealed shifts toward more compliant isoforms, an adaptation that offsets increases in passive stiffness based on the extracellular matrix. Similar shifts are observed in heart failure with preserved ejection fraction. In contrast, hypophosphorylation of PKA/G sites contributes to a net increase in cardiomyocyte resting tension in heart failure with preserved ejection fraction. More recently, titin mutations have been recognized as the most common etiology of inherited DCM. In addition, some DCM-causing mutations affect RBM20, a titin splice factor. Titin mutations are a rare cause of hypertrophic cardiomyopathy and also underlie some cases of arrhythmogenic right ventricular dysplasia. Finally, mutations of genes encoding proteins that interact with and/or bind to titin are responsible for both DCM and hypertrophic cardiomyopathy. Targeting titin as a therapeutic strategy is in its infancy, but it could potentially involve manipulation of isoforms, posttranslational modifications, and upregulation of normal protein in patients with disease-causing mutations.

Original languageEnglish (US)
Pages (from-to)207-212
Number of pages6
JournalJournal of Cardiovascular Pharmacology
Volume63
Issue number3
DOIs
StatePublished - Mar 2014

Keywords

  • Cardiomyopathy
  • Genetics
  • Heart failure
  • Myocardium
  • Titin

ASJC Scopus subject areas

  • Pharmacology
  • Cardiology and Cardiovascular Medicine

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