Posttetanic enhancement of striato-pallidal synaptic transmission

Juhyon Kim, Hitoshi Kita

Research output: Contribution to journalArticle

Abstract

The striato (Str)-globus pallidus external segment (GPe) projection plays major roles in the control of neuronal activity in the basal ganglia under both normal and pathological conditions. The present study used rat brain slice preparations to characterize the enhancement of Str-GPe synapses observed after repetitive conditioning stimuli (CS) of Str with the whole cell patch-clamp recording technique. The results show that 1) the Str-GPe synapses have a posttetanic enhancement (PTE) mechanism, which is considered to be a combination of an augmentation and a posttetanic potentiation; 2) the degree of PTE observed in GPe neurons had a wide range and was positively correlated with a wide range of paired-pulse ratios assessed before application of CS; 3) a wide range of CS, from frequencies as low as 2 Hz with as few as 5 pulses to as high as 100 Hz with 100 pulses, could induce PTE; 4) the decay time constant of PTE was dependent on the strength of CS and was prolonged greatly, up to 120 s, when strong CS were applied; and 5) the level of postsynaptic Cl- became a limiting factor for the degree of PTE when strong CS were applied. These results imply that Str-GPe synapses transmit inhibitions in a nonlinear activity-weighted manner, which may be suited for scaling timing and force of repeated or sequential body movements. Other possible factors controlling the induction of PTE and functional implications are also discussed.

Original languageEnglish (US)
Pages (from-to)447-454
Number of pages8
JournalJournal of neurophysiology
Volume114
Issue number1
DOIs
StatePublished - May 20 2015

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Globus Pallidus
Synaptic Transmission
Synapses
Patch-Clamp Techniques
Basal Ganglia
Neurons
Brain

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Physiology

Cite this

Posttetanic enhancement of striato-pallidal synaptic transmission. / Kim, Juhyon; Kita, Hitoshi.

In: Journal of neurophysiology, Vol. 114, No. 1, 20.05.2015, p. 447-454.

Research output: Contribution to journalArticle

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