A novel role for protein phosphatase 2A in the dopaminergic regulation of Na,K-ATPase

Emilia Lecuona; Alphonse Garcia; Jacob I. Sznajder

doi:10.1016/S0014-5793(00)02009-3

A novel role for protein phosphatase 2A in the dopaminergic regulation of Na,K-ATPase

Emilia Lecuona, Alphonse Garcia, Jacob I. Sznajder^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Stimulation of dopaminergic type 1 (D₁) receptors increases lung edema clearance by regulating Na,K-ATPase function in the alveolar epithelium. We studied the role of serine/threonine protein phosphatases in the Na,K-ATPase regulation by D₁ agonists in A549 cells. We found that low doses of the type 1/2A protein phosphatase inhibitor okadaic acid as well as SV40 small t antigen transiently transfected into A549 cells prevented the D₁ agonist- induced increase in Na,K-ATPase activity and translocation from intracellular pools to the plasma membrane. This was associated with a rapid and transient increase in protein phosphatase 2A activity. We conclude that D₁ stimulation regulates Na,K-ATPase activity by promoting recruitment of Na,K-ATPases from intracellular pools into the basolateral membranes of A549 cells via a type 2A protein phosphatase. (C) 2000 Federation of European Biochemical Societies.

Original language	English (US)
Pages (from-to)	217-220
Number of pages	4
Journal	FEBS Letters
Volume	481
Issue number	3
DOIs	https://doi.org/10.1016/S0014-5793(00)02009-3
State	Published - Sep 22 2000

Keywords

A549 cell
D agonist
Na,K-ATPase
Protein phosphatase

ASJC Scopus subject areas

Biophysics
Structural Biology
Biochemistry
Molecular Biology
Genetics
Cell Biology

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10.1016/S0014-5793(00)02009-3

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title = "A novel role for protein phosphatase 2A in the dopaminergic regulation of Na,K-ATPase",

abstract = "Stimulation of dopaminergic type 1 (D1) receptors increases lung edema clearance by regulating Na,K-ATPase function in the alveolar epithelium. We studied the role of serine/threonine protein phosphatases in the Na,K-ATPase regulation by D1 agonists in A549 cells. We found that low doses of the type 1/2A protein phosphatase inhibitor okadaic acid as well as SV40 small t antigen transiently transfected into A549 cells prevented the D1 agonist- induced increase in Na,K-ATPase activity and translocation from intracellular pools to the plasma membrane. This was associated with a rapid and transient increase in protein phosphatase 2A activity. We conclude that D1 stimulation regulates Na,K-ATPase activity by promoting recruitment of Na,K-ATPases from intracellular pools into the basolateral membranes of A549 cells via a type 2A protein phosphatase. (C) 2000 Federation of European Biochemical Societies.",

keywords = "A549 cell, D agonist, Na,K-ATPase, Protein phosphatase",

author = "Emilia Lecuona and Alphonse Garcia and Sznajder, {Jacob I.}",

note = "Funding Information: The authors wish to thank Dr. A. Bertorello, Dr. L. Dada, Dr. C. Guerrero, Dr. K. Ridge, and Dr. L. Pesce for valuable discussions, R. Vena for technical support, and Dr. E. Sontag for the small t expression plasmid. This research was supported in part by HL 65161 to J.I.S., the Department of Medicine, Northwestern University, and grants ARC 9449 and 9294 to A.G.",

year = "2000",

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doi = "10.1016/S0014-5793(00)02009-3",

language = "English (US)",

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AU - Lecuona, Emilia

AU - Garcia, Alphonse

AU - Sznajder, Jacob I.

N1 - Funding Information: The authors wish to thank Dr. A. Bertorello, Dr. L. Dada, Dr. C. Guerrero, Dr. K. Ridge, and Dr. L. Pesce for valuable discussions, R. Vena for technical support, and Dr. E. Sontag for the small t expression plasmid. This research was supported in part by HL 65161 to J.I.S., the Department of Medicine, Northwestern University, and grants ARC 9449 and 9294 to A.G.

PY - 2000/9/22

Y1 - 2000/9/22

N2 - Stimulation of dopaminergic type 1 (D1) receptors increases lung edema clearance by regulating Na,K-ATPase function in the alveolar epithelium. We studied the role of serine/threonine protein phosphatases in the Na,K-ATPase regulation by D1 agonists in A549 cells. We found that low doses of the type 1/2A protein phosphatase inhibitor okadaic acid as well as SV40 small t antigen transiently transfected into A549 cells prevented the D1 agonist- induced increase in Na,K-ATPase activity and translocation from intracellular pools to the plasma membrane. This was associated with a rapid and transient increase in protein phosphatase 2A activity. We conclude that D1 stimulation regulates Na,K-ATPase activity by promoting recruitment of Na,K-ATPases from intracellular pools into the basolateral membranes of A549 cells via a type 2A protein phosphatase. (C) 2000 Federation of European Biochemical Societies.

AB - Stimulation of dopaminergic type 1 (D1) receptors increases lung edema clearance by regulating Na,K-ATPase function in the alveolar epithelium. We studied the role of serine/threonine protein phosphatases in the Na,K-ATPase regulation by D1 agonists in A549 cells. We found that low doses of the type 1/2A protein phosphatase inhibitor okadaic acid as well as SV40 small t antigen transiently transfected into A549 cells prevented the D1 agonist- induced increase in Na,K-ATPase activity and translocation from intracellular pools to the plasma membrane. This was associated with a rapid and transient increase in protein phosphatase 2A activity. We conclude that D1 stimulation regulates Na,K-ATPase activity by promoting recruitment of Na,K-ATPases from intracellular pools into the basolateral membranes of A549 cells via a type 2A protein phosphatase. (C) 2000 Federation of European Biochemical Societies.

KW - A549 cell

KW - D agonist

KW - Na,K-ATPase

KW - Protein phosphatase

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A novel role for protein phosphatase 2A in the dopaminergic regulation of Na,K-ATPase

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