Theta-frequency bursting and resonance in cerebellar granule cells: Experimental evidence and modeling of a slow K+-dependent mechanism

Egidio D'Angelo, Thierry Nieus, Arianna Maffei, Simona Armano, Paola Rossi, Vanni Taglietti, Andrea Fontana, Giovanni Naldi

Research output: Contribution to journalArticle

Abstract

Neurons process information in a highly nonlinear manner, generating oscillations, bursting, and resonance, enhancing responsiveness at preferential frequencies. It has been proposed that slow repolarizing currents could be responsible for both oscillation/burst termination and for high-pass filtering that causes resonance (Hutcheon and Yarom, 2000). However, different mechanisms, including electrotonic effects (Mainen and Sejinowski, 1996), the expression of resurgent currents (Raman and Bean, 1997), and network feedback, may also be important. In this study we report theta-frequency (3-12 Hz) bursting and resonance in rat cerebellar granule cells and show that these neurons express a previously unidentified slow repolarizing K+ current (IK-slow). Our experimental and modeling results indicate that IK-slow was necessary for both bursting and resonance. A persistent (and potentially a resurgent) Na+ current exerted complex amplifying actions on bursting and resonance, whereas electrotonic effects were excluded by the compact structure of the granule cell. Theta-frequency bursting and resonance in granule cells may play an important role in determining synchronization, rhythmicity, and learning in the cerebellum.

Original languageEnglish
Pages (from-to)759-770
Number of pages12
JournalJournal of Neuroscience
Volume21
Issue number3
Publication statusPublished - 2001

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Keywords

  • Bursting
  • Cerebellum
  • Granule cell
  • M-current
  • Modeling
  • Resonance

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

D'Angelo, E., Nieus, T., Maffei, A., Armano, S., Rossi, P., Taglietti, V., Fontana, A., & Naldi, G. (2001). Theta-frequency bursting and resonance in cerebellar granule cells: Experimental evidence and modeling of a slow K+-dependent mechanism. Journal of Neuroscience, 21(3), 759-770.