Unique properties of R-type calcium currents in neocortical and neostriatal neurons

Robert Foehring, Paul G. Mermelstein, Wen Jie Song, Sasha Ulrich, D. James Surmeier

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Whole cell recordings from acutely dissociated neocortical pyramidal neurons and striatal medium spiny neurons exhibited a calcium-channel current resistant to known blockers of L-, N-, and P/Q-type Ca2+ channels. These R-type currents were characterized as high-voltage-activated (HVA) by their rapid deactivation kinetics, half-activation and half-inactivation voltages, and sensitivity to depolarized holding potentials. In both cell types, the R-type current activated at potentials relatively negative to other HVA currents in the same cell type and inactivated rapidly compared with the other HVA currents. The main difference between cell types was that R-type currents in neocortical pyramidal neurons inactivated at more negative potentials than R-type currents in medium spiny neurons. Ni2+ sensitivity was not diagnostic for R-type currents in either cell type. Single-cell RT-PCR revealed that both cell types expressed the α1E mRNA, consistent with this subunit being associated with the R-type current.

Original languageEnglish (US)
Pages (from-to)2225-2236
Number of pages12
JournalJournal of Neurophysiology
Volume84
Issue number5
StatePublished - Nov 29 2000

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Calcium
Neurons
Pyramidal Cells
Corpus Striatum
Patch-Clamp Techniques
Calcium Channels
Polymerase Chain Reaction
Messenger RNA

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Physiology

Cite this

Foehring, R., Mermelstein, P. G., Song, W. J., Ulrich, S., & Surmeier, D. J. (2000). Unique properties of R-type calcium currents in neocortical and neostriatal neurons. Journal of Neurophysiology, 84(5), 2225-2236.

Unique properties of R-type calcium currents in neocortical and neostriatal neurons. / Foehring, Robert; Mermelstein, Paul G.; Song, Wen Jie; Ulrich, Sasha; Surmeier, D. James.

In: Journal of Neurophysiology, Vol. 84, No. 5, 29.11.2000, p. 2225-2236.

Research output: Contribution to journalArticle

Foehring, R, Mermelstein, PG, Song, WJ, Ulrich, S & Surmeier, DJ 2000, 'Unique properties of R-type calcium currents in neocortical and neostriatal neurons', Journal of Neurophysiology, vol. 84, no. 5, pp. 2225-2236.
Foehring R, Mermelstein PG, Song WJ, Ulrich S, Surmeier DJ. Unique properties of R-type calcium currents in neocortical and neostriatal neurons. Journal of Neurophysiology. 2000 Nov 29;84(5):2225-2236.
Foehring, Robert ; Mermelstein, Paul G. ; Song, Wen Jie ; Ulrich, Sasha ; Surmeier, D. James. / Unique properties of R-type calcium currents in neocortical and neostriatal neurons. In: Journal of Neurophysiology. 2000 ; Vol. 84, No. 5. pp. 2225-2236.
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