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Feedforward Inhibition of Projection Neurons by Fast-Spiking GABA Interneurons in the Rat Striatum In Vivo

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Mallet, Nicolas, Le Moine, Catherine, Charpier, Stéphane, Gonon, François·2005·The Journal of Neuroscience
DOI 10.1523/jneurosci.5027-04.2005
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Abstract

Discharge activities and local field potentials were recorded in the orofacial motor cortex and in the corresponding rostrolateral striatum of urethane-anesthetized rats. Striatal projection neurons were identified by antidromic activation and fast-spiking GABAergic interneurons (FSIs) by their unique characteristics: briefer spike and burst responses. Juxtacellular injection of neurobiotin combined with parvalbumin immunohistochemistry validated this identification. Spontaneous activities and spike responses to cortical stimulation were recorded during both states of cortical activity: slow waves and desynchronization. Both FSI and projection neurons spontaneously discharged synchronously with slow waves at the maximum of cortical activity, but, on average, FSIs were much more active. Cortical desynchronization enhanced FSI activity and facilitated their spike responses to cortical stimulation, whereas opposite effects were observed regarding projection neurons. Experimental conditions favoring FSI discharge were always associated with a decrease in the firing activity of projection neurons. Spike responses to cortical stimulation occurred earlier (latency difference, 4.6 ms) and with a lower stimulation current for FSIs than for projection neurons. Moreover, blocking GABA A receptors by local picrotoxin injection enhanced the spike response of projection neurons, and this increase was larger in experimental conditions favoring FSI responses. Therefore, on average, FSIs exert in vivo a powerful feedforward inhibition on projection neurons. However, a few projection neurons were actually more sensitive to cortical stimulation than FSIs. Moreover, picrotoxin, which revealed FSI inhibition, preferentially affected projection neurons exhibiting the weakest sensitivity to cortical stimulation. Thus, feedforward inhibition by FSIs filters cortical information effectively transmitted by striatal projection neurons.

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Metadata

Authors
Mallet, N., Le Moine, C., Charpier, S., & Gonon, F.
Venue
The Journal of Neuroscience
Publisher
Society for Neuroscience
Published
2005-04-13
Volume
25
Issue
15
Pages
3857-3869
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
DOI
10.1523/jneurosci.5027-04.2005
OpenAlex
W2060584026
Cited by
383
References
0
FWCI
6.11
Type
journal article
Language
en
Open access
hybrid
Licence
creativecommons.org/licenses/by-nc-sa/4.0/ (vor, 183 d)

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CoChat. (2026). Citation check: Feedforward Inhibition of Projection Neurons by Fast-Spiking GABA Interneurons in the Rat Striatum In Vivo. https://app.cochat.ai/papers/10.1523/jneurosci.5027-04.2005
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Mallet, N., Le Moine, C., Charpier, S., & Gonon, F. (2005). Feedforward Inhibition of Projection Neurons by Fast-Spiking GABA Interneurons in the Rat Striatum In Vivo. The Journal of Neuroscience. https://doi.org/10.1523/jneurosci.5027-04.2005

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