Modified sympathetic regulation in N-type calcium channel null-mouse

Manabu Murakami, Takayoshi Ohba, Tsai Wen Wu, Susumu Fujisawa, Takashi Suzuki, Yoichiro Takahashi, Eiki Takahashi, Hiroyuki Watanabe, Ichiro Miyoshi, Kyoichi Ono, Hironobu Sasano, Hiroshi Ito, Toshihiko Iijima

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12 Citations (Scopus)


To elucidate the physiological importance of neuronal (N)-type calcium channels in sympathetic controls, we analyzed N-type channel-deficient (NKO) mice. Immunoprecipitation analysis revealed increased interaction between β3 (a major accessory subunit of N-type channels) and R-type channel-forming CaV2.3 in NKO mice. R-R intervals in NKO ECG recordings were elongated and fluctuating, suggesting disturbed sympathetic tonus. N-type channel inhibitors elongated the R-R interval in control mice, whereas R-type channel blocking with SNX-482 significantly affected NKO but not control mice, indicating a compensatory role for R-type channels. Echocardiography and Langendorff heart analysis confirmed a major role for R-type channels in NKO mice. Combined, our biochemical and physiological analyses strongly suggest that the remaining sympathetic tonus in NKO mice is dependent on R-type calcium channels.

Original languageEnglish
Pages (from-to)1016-1020
Number of pages5
JournalBiochemical and biophysical research communications
Issue number4
Publication statusPublished - 2007 Mar 23


  • Calcium
  • Channel
  • Heart rate variability
  • Mouse
  • Sympathetic nerve

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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  • Cite this

    Murakami, M., Ohba, T., Wu, T. W., Fujisawa, S., Suzuki, T., Takahashi, Y., Takahashi, E., Watanabe, H., Miyoshi, I., Ono, K., Sasano, H., Ito, H., & Iijima, T. (2007). Modified sympathetic regulation in N-type calcium channel null-mouse. Biochemical and biophysical research communications, 354(4), 1016-1020.