Pflügers Archiv

, Volume 450, Issue 5, pp 345–354 | Cite as

Inhibition of TRPC5 channels by Ca2+-binding protein 1 in Xenopus oocytes

  • Mariko Kinoshita-Kawada
  • Jisen Tang
  • Rui Xiao
  • Shuji Kaneko
  • J. Kevin Foskett
  • Michael X. ZhuEmail author
Ion Channels, Transporters


The transient receptor potential canonical type 5 (TRPC5) channel is a member of the channels that has been implicated in neurite extension and growth cone morphology of hippocampal neurons. Although homomeric TRPC5 channels are activated following stimulation of Gq/11-coupled receptors, the exact mechanism for this activation remains unresolved. Using two-electrode voltage clamp recordings, we show that the activity of TRPC5 channels expressed in Xenopus oocytes is dependent on the presence of Ca2+ at the extracellular as well as the cytoplasmic side of the plasma membrane. TRPC5 was activated by the stimulation of coexpressed M5 muscarinic receptors or by ionomycin. The TRPC5 activity was detectable with the presence of submillimolar levels of extracellular Ca2+, but it was eliminated by the injection of 5 mM 1,2-bis(o-aminophenoxy)ethane-N,N,N′,N′-tetraacetic acid into the oocytes. Lanthanum could substitute for extracellular Ca2+ to support TRPC5 activity. Coexpression of Ca2+-binding protein 1 (CaBP1), but not calmodulin (CaM), inhibited the TRPC5 activity, without affecting the cell surface expression of TRPC5 proteins. Using in vitro binding assays, we demonstrated direction interactions between CaBP1 and TRPC5. The CaBP1-binding sites at the C terminus of TRPC5 are closely localized, but not identical, to CaM-binding sites. We conclude that TRPC5 is a Ca2+-regulated channel, and its activity is negatively controlled by CaBP1.


G protein TRPC Calmodulin CaBP1 Growth cone Synaptogenesis Capacitative Ca2+ entry 



This work is supported by the National Institutes of Health grant NS42183 to M.X.Z. We thank Ms. Dina Chuang-Zhu for technical assistance.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Mariko Kinoshita-Kawada
    • 1
  • Jisen Tang
    • 1
  • Rui Xiao
    • 1
  • Shuji Kaneko
    • 2
  • J. Kevin Foskett
    • 3
  • Michael X. Zhu
    • 1
    Email author
  1. 1.Department of Neuroscience and the Center for Molecular NeurobiologyThe Ohio State UniversityColumbusUSA
  2. 2.Department of NeuropharmacologyKyoto University Graduate School of Pharmaceutical SciencesKyotoJapan
  3. 3.Department of PhysiologyUniversity of PennsylvaniaPhiladelphiaUSA

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