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Molecular Pharmacology

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Abstract

D1A dopamine receptor stimulation inhibits Na+/K(+)-ATPase activity through protein kinase A.

A Horiuchi, K Takeyasu, M M Mouradian, P A Jose and R A Felder
Molecular Pharmacology February 1993, 43 (2) 281-285;
A Horiuchi
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K Takeyasu
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M M Mouradian
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P A Jose
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R A Felder
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Abstract

We stably expressed the rat D1A dopamine receptor in mouse fibroblast LTK- cells and obtained specific ligand binding and functional activity characteristic of the D1A dopamine receptor coupled to stimulation of adenylyl cyclase. In the transfected cells, the selective D1 agonist fenoldopam caused a concentration-dependent inhibition of Na+/K(+)-ATPase activity, achieving maximum inhibition of approximately 30%. The latter was abolished by the selective D1 antagonist (+)-SCH 23390 and by the specific protein kinase A inhibitor protein kinase inhibitor-(6-22) amide. In the nontransfected cells, fenoldopam did not affect Na+/K(+)-ATPase activity. 8-Chlorophenylthio-cAMP inhibited Na+/K(+)-ATPase activity in both transfected and nontransfected cells; this effect was blocked by protein kinase inhibitor-(6-22). These results indicate that the inhibition of Na+/K(+)-ATPase activity induced by agonist occupancy of D1A receptors is mediated by protein kinase A.

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Molecular Pharmacology
Vol. 43, Issue 2
1 Feb 1993
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Abstract

D1A dopamine receptor stimulation inhibits Na+/K(+)-ATPase activity through protein kinase A.

A Horiuchi, K Takeyasu, M M Mouradian, P A Jose and R A Felder
Molecular Pharmacology February 1, 1993, 43 (2) 281-285;

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Abstract

D1A dopamine receptor stimulation inhibits Na+/K(+)-ATPase activity through protein kinase A.

A Horiuchi, K Takeyasu, M M Mouradian, P A Jose and R A Felder
Molecular Pharmacology February 1, 1993, 43 (2) 281-285;
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