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Nanomolar concentrations of kynurenic acid reduce extracellular dopamine levels in the striatum
Arash Rassoulpour1, Hui-Qiu Wu, Sergi Ferre
1Maryland Psychiatric Research Center, University of Maryland School of Medicine, Baltimore, Maryland 21218, USA.
Journal of Neurochemistry
|April 20, 2005
Summary
Astrocyte-derived kynurenic acid (KYNA) significantly lowers striatal dopamine levels in rats. This neuroinhibition occurs via blockade of alpha7 nicotinic acetylcholine receptors, impacting dopaminergic neurotransmission.
Area of Science:
- Neuroscience
- Neurochemistry
- Astrocyte Biology
Background:
- Dopaminergic activity in the basal ganglia is crucial for normal function and implicated in various pathologies.
- Astrocyte-derived metabolites play significant roles in modulating neuronal activity.
Purpose of the Study:
- To investigate the effect of kynurenic acid (KYNA) on extracellular striatal dopamine levels in vivo.
- To elucidate the mechanism underlying KYNA's influence on dopaminergic neurotransmission.
Main Methods:
- In vivo electrochemistry in unanesthetized rats.
- Measurement of extracellular dopamine levels in the striatum.
- Pharmacological blockade of alpha7 nicotinic acetylcholine receptors.
Main Results:
- Nanomolar concentrations of KYNA markedly reduced extracellular striatal dopamine levels.
- This reduction was initiated by the blockade of alpha7 nicotinic acetylcholine receptors.
- The findings demonstrate glia-neuron interactions influencing dopamine.
Conclusions:
- Endogenous kynurenic acid can potently interfere with dopaminergic neurotransmission.
- Astrocyte-neuron communication via KYNA is functionally relevant in the striatum.
- Modulation of KYNA levels offers a potential target for neurological disorders affecting dopamine.