Functional characterization of kainate receptors in the rat nucleus accumbens core region.
The nucleus accumbens, a brain region involved in motivation, attention, and reward, receives substantial glutamatergic innervation from many limbic structures. This excitatory glutamatergic input plays an integral role in both normal and pathophysiological states. Despite the importance of glutamatergic transmission in the nucleus accumbens, the specific receptor subtypes that mediate glutamatergic signaling in this brain region have not been fully characterized. The current study sought to examine the possible role of the kainate subclass of glutamate receptor in the nucleus accumbens. Kainate receptors are relatively poorly understood members of the ionotropic glutamate receptor family and are highly expressed in the nucleus accumbens. Recent studies have highlighted a number of novel pre- and postsynaptic functions of kainate receptors in several other brain regions. Using the whole cell patch-clamp technique, we report the first demonstration of functional kainate receptors on neurons within the core region of the nucleus accumbens. In addition, we present evidence that activation of kainate receptors in this brain region inhibits excitatory synaptic transmission via a presynaptic mechanism.
Crowder
Tara L
TL
Department of Physiology and Pharmacology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA.
Weiner
Jeff L
JL
D000818:Animals; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects; D018698:Glutamic Acid / Q000502:physiology; D066298:In Vitro Techniques; D007608:Kainic Acid / Q000494:pharmacology; D008297:Male; D009474:Neurons / Q000378:metabolism; D009714:Nucleus Accumbens / Q000166:cytology / Q000378:metabolism*; D017729:Presynaptic Terminals / Q000502:physiology; D051381:Rats; D017207:Rats, Sprague-Dawley; D018080:Receptors, GABA-B / Q000502:physiology; D018092:Kainic Acid Receptors / Q000502:physiology*; D018094:Receptors, Metabotropic Glutamate / Q000502:physiology; D018047:Receptors, Purinergic P1 / Q000502:physiology; D013569:Synapses / Q000378:metabolism; D009435:Synaptic Transmission / Q000187:drug effects
D018698:Glutamic Acid; D007608:Kainic Acid; D018080:Receptors, GABA-B; D018092:Kainic Acid Receptors; D018094:Receptors, Metabotropic Glutamate; D018047:Receptors, Purinergic P1