Phosphorylation of Na+/Ca2+ exchanger in TAB-induced cardiac hypertrophy

Yuki Katanosaka, Bongju Kim, Shigeo Wakabayashi, Satoshi Matsuoka, Munekazu Shigekawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


Both protein kinase Cα-dependent Na+/Ca2+ exchanger1 (NCX1) phosphorylation and calcineurin activity are required for the depression of NCX activity observed in chronically phenylephrine (PE)-treated hypertrophic neonatal rat cardiomyocytes. In this study, we explored the possibility that the same changes occur in vivo hypertrophy. In the hypertrophic hearts of thoracic aortic-banded (TAB) mice, NCX1 phosphorylation increased significantly compared with control hearts. Furthermore, the TAB-induced cardiac hypertrophy was much less prominent in transgenic mice overexpressing an NCX1 mutant having defective phosphorylation sites. These data suggest that the phosphorylation status of NCX1 may play an important role in the pathogenesis of load-induced cardiac hypertrophy.

Original languageEnglish
Title of host publicationSodium-Calcium Exchange and the Plasma Membrane Ca2+ATPase in Ce;; Funcyion
Subtitle of host publicationFifth International Conference
PublisherBlackwell Publishing Inc.
Number of pages4
ISBN (Print)1573316490, 9781573316491
Publication statusPublished - Mar 2007

Publication series

NameAnnals of the New York Academy of Sciences
ISSN (Print)0077-8923
ISSN (Electronic)1749-6632


  • Cardiac hypertrophy
  • Na/Ca exchanger
  • Phosphorylation
  • Protein kinase Cα
  • Thoracic aortic banding

ASJC Scopus subject areas

  • General Neuroscience
  • General Biochemistry,Genetics and Molecular Biology
  • History and Philosophy of Science


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