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Neurochemical changes in dopamine D1, D3 and D1/D3 receptor knockout mice. | LitMetric

Neurochemical changes in dopamine D1, D3 and D1/D3 receptor knockout mice.

Eur J Pharmacol

Neurosciences Group, Monash University, Department of Medicine, Monash Medical Centre, Level 5 Block E, 246 Clayton Road, Clayton, Victoria 3168, Australia.

Published: July 2003

AI Article Synopsis

Article Abstract

Neurochemical changes were examined in dopamine D1 receptor knockout (D1(-/-)), dopamine D3 receptor knockout (D3(-/-)) and dopamine D1/D3 receptor double knockout (D1(-/-)D3(-/-)) mice. The level of dopamine D1- and D2-like receptors and gamma-aminobutyric acid (GABA(A)) receptor was assessed by ligand autoradiography and dopamine D1- and D2 receptor, enkephalin, dynorphin and substance P transcripts measured by in situ hybridization. D1(-/-) mice had normal GABA(A) receptor levels, reduced dynorphin and substance P, and increased enkephalin mRNA and dopamine D2-like binding. D1(-/-)D3(-/-) mice evidenced decreased dynorphin and substance P but normal enkephalin expression, whereas dopamine D2-like and GABA(A) receptor binding were increased. Major changes occur in substance P and dynorphin expression in D1(-/-) mice and these changes are unaffected by loss of dopamine D3 receptors. Upregulated dopamine D2-like binding and enkephalin in D1(-/-) mice may be due to decreased dopamine turnover. Upregulated enkephalin in D1(-/-) mice is dependent on functional dopamine D3 receptors.

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Source
http://dx.doi.org/10.1016/s0014-2999(03)01862-4DOI Listing

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