Identification of the isoforms of Ca2+/calmodulin-dependent protein kinase II in rat astrocytes and their subcellulur localization

Yusuke Takeuchi, Hideyuki Yamamoto, Kohji Fukunaga, Taihei Miyakawa, Eishichi Miyamoto

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Ca2+/calmodulin-dependent protein kinase II (CaM kinase II) occurs in astrocytes as well as in neurons in brain. We have reported that CaM kinase II is involved in the regulation of cytoskeletal proteins and gene expression in astrocytes. In this study, we identified all isoforms of CaM kinase II in astrocytes and examined their subcellular localization. When we amplified the isoforms of four subunits by RT-PCR followed by the 'nested' PCR, totally 10 isoforms were obtained. Immunoblot analyses with five types of antibodies against CaM kinase II indicated that the most abundant isoform was δ2. Immunostaining suggested that the δ2 isoform was localized predominantly at the Golgi apparatus. The localization of the δ2 isoform at the Golgi apparatus was also observed in NG108-15 cells. We overexpressed all isoforms that contained the nuclear localization signal to examine their nuclear targeting in NG108-15 cells. In contrast to the αB and δ3 isoforms that entered the nucleus, as reported, the γA isoform was excluded from the nucleus in the transfected NG108-15 cells. These results suggest that the 15- amino acid insertion following the nuclear localization signal inhibits the nuclear targeting of the γA isoform.

Original languageEnglish
Pages (from-to)2557-2567
Number of pages11
JournalJournal of Neurochemistry
Volume74
Issue number6
DOIs
Publication statusPublished - 2000

Keywords

  • Astrocytes
  • Ca/calmodulin-dependent protein kinase II
  • Calmodulin
  • NG108-15 cells
  • Nuclear localization signal
  • Nucleus

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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