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Dopamine function in the prefrontal cortex of the rat is sensitive to a reduction of tonic GABA-mediated inhibition in the thalamic mediodorsal nucleus

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Summary

Dopamine (DA) utilisation has been determined in the medial bank of the prefrontal cortex (FCx) and the agranular insular cortex (AgCx) of the rat in response to a unilateral reduction of γ-aminobutyric acid (GABA)-mediated inhibition in the thalamic mediodorsal nucleus (MD). The ratios of 3,4-dihydroxyphenylacetic acid (DOPAC) ∶ DA and 4-hydroxy-3-methoxyphenylacetic acid (homovanillic acid, HVA): DA were used as indices of DA utilisation. A bilateral increase in both ratios was found in FCx and AgCx following unilateral infusion of GABA antagonists (1 mM) into MDc. When this concentration was infused into one MDL no change was detected in DA utilisation of FCx, although a bilateral increase was observed in AgCx. However, a correspondence with the known anatomical connections was attained following infusion of lower concentrations (0.5 mM) into MDL in that a significant bilateral elevation of DA utilisation was shown in FCx. The changes induced in these ratios by the above treatments were, in general, due to increases in the concentration of metabolite and slight decreases in that of DA. However, unilateral lesions to the presumed GABA-containing neurones of the rostrodorsal thalamic reticular nucleus (TRNd), which topographically innervate MDL, produced increases in both metabolite and DA concentrations in FCx of both hemispheres, whilst those in AgCx were unaffected. Despite the slightly different results obtained using these two experimental approaches, it is argued that a reduction of tonic GABA-mediated inhibition in MD may tend to activate the DA system in cortical target regions.

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Authors and Affiliations

  1. Department of Pharmacology, Medical School, University of Bristol, University Walk, BS8 lTD, Bristol, UK

    M. W. Jones & I. C. Kilpatrick

  2. Department of Anatomy, Medical School, University of Bristol, University Walk, BS8 lTD, Bristol, UK

    O. T. Phillipson

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  1. M. W. Jones
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  2. I. C. Kilpatrick
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  3. O. T. Phillipson
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Jones, M.W., Kilpatrick, I.C. & Phillipson, O.T. Dopamine function in the prefrontal cortex of the rat is sensitive to a reduction of tonic GABA-mediated inhibition in the thalamic mediodorsal nucleus. Exp Brain Res 69, 623–634 (1988). https://doi.org/10.1007/BF00247314

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