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Volume 16, Number 18,
Issue of September 15, 1996
pp. 5870-5882
Copyright ©1996 Society for Neuroscience
Modulatory Actions of Dopamine on NMDA Receptor-Mediated
Responses Are Reduced in D1A-Deficient Mutant Mice
Received May 6, 1996; revised June 24, 1996; accepted June 25, 1996.
Michael S. Levine1,
Katharine L. Altemus1,
Carlos Cepeda1,
Howard C. Cromwell1,
Cynthia Crawford1,
Marjorie A. Ariano2,
John Drago3,
David R. Sibley4, and
Heiner Westphal5
1 Mental Retardation Research Center, University of
California, Los Angeles, Los Angeles, California 90024-1759,
2 Department of Neuroscience, The Chicago Medical School,
North Chicago, Illinois 60064, 3 Anatomy Department, Monash
University, Clayton, Victoria 3168, Australia,
4 Experimental Therapeutics Branch, National Institute of
Neurological Disorders and Stroke, Bethesda, Maryland 20892, and
5 Laboratory of Mammalian Genes and Development, National
Institutes of Child Health and Human Development, Bethesda, Maryland
20892
The role of D1 dopamine (DA) receptors in mediating the
ability of DA to modulate responses attributable to activation of NMDA
receptors was examined in mice lacking D1A dopamine
receptors. Specifically, experiments were designed to test the
hypothesis that the ability of DA to potentiate responses mediated by
activation of NMDA receptors was attributable to activation of
D1 receptors. Based on this hypothesis, we would predict
that in the D1A mutant mouse, either DA would not induce
enhancement of NMDA-mediated responses, or the enhancement would be
severely attenuated. The results provided evidence to support the
hypothesis. In mutant mice, DA and D1 receptor agonists did
not potentiate responses mediated by activation of NMDA receptors. In
contrast, in control mice, both DA and D1 receptor agonists
markedly potentiated responses mediated by activation of NMDA
receptors. The effects of DA in attenuating responses mediated by
activation of non-NMDA receptors also were altered in the mutant,
suggesting that this action of DA may require coupling or interactions
between D1 and D2 receptors. The present
studies also provided an opportunity to assess some of the basic
electrophysiological and morphological properties of neostriatal
neurons in mice lacking D1A DA receptors. Resting membrane
potential, action potential parameters, input resistance, excitability,
somatic size, dendritic extent, and estimates of spine density in
mutants and controls were similar, suggesting that these basic
neurophysiological and structural properties have not been changed by
the loss of the D1A DA receptor.
Key words:
dopamine receptors;
D1;
excitatory
amino acid receptors;
knock-out mice;
mutant;
neostriatal slices;
NMDA
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