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Modulation of Na+,K+-ATPase activity is of importance for RVD
KTH, Tidigare Institutioner (före 2005), Fysik.ORCID-id: 0000-0003-0578-4003
2004 (Engelska)Ingår i: Acta Physiologica Scandinavica, ISSN 0001-6772, E-ISSN 1365-201X, Vol. 180, nr 4, s. 329-334Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Aim: This study was performed to examine the role of Na+,K+-ATPase activity for the adaptive response to cell swelling induced by hypoosmoticity, i.e. the regulatory volume decrease (RVD). Methods: The studies were performed on COS-7 cells transfected with rat Na+,K+-ATPase. To study changes in cell volume, cells were loaded with the fluorescent dye calcein and the intensity of the dye, following exposure to a hypoosmotic medium, was recorded with confocal microscopy. Results: Ouabain-mediated inhibition of Na+,K+-ATPase resulted in a dose dependent decrease in the rate of RVD. Total Rb-86(+) uptake as well as ouabain dependent Rb-86(+) uptake, used as an index of Na+,K+-ATPase dependent K+ uptake, was significantly increased during the first 2 min following exposure to hypoosmoticity. Since protein kinase C (PKC) plays an important role in the modulation of RVD, a study was carried out on COS-7 cells expressing rat Na+,K+-ATPase, where Ser23 in the catalytic alpha1 subunit of rat Na+,K+-ATPase had been mutated to Ala (S23A), abolishing a known PKC phosphorylation site. Cells expressing S23A rat Na+,K+-ATPase exhibited a significantly lower rate of RVD and showed no increase in Rb-86(+) uptake during RVD. Conclusion: Taken together, these results suggest that a PKC-mediated transient increase in Na+,K+-ATPase activity plays an important role in RVD.

Ort, förlag, år, upplaga, sidor
2004. Vol. 180, nr 4, s. 329-334
Nyckelord [en]
cell volume, Na+, K+-ATPase, protein kinase C, regulatory volume decrease, protein-kinase-c, regulatory volume decrease, 4th transmembrane segment, rat-kidney na+, k+-atpase, cell-volume, phosphorylation site, alpha-subunit, na+, permeability, activation
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Fysiologi
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URN: urn:nbn:se:kth:diva-23267DOI: 10.1111/j.1365-201X.2003.01256.xISI: 000220306100002PubMedID: 15030374Scopus ID: 2-s2.0-1942438089OAI: oai:DiVA.org:kth-23267DiVA, id: diva2:341965
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QC 20100525 QC 20111028Tillgänglig från: 2010-08-10 Skapad: 2010-08-10 Senast uppdaterad: 2022-06-25Bibliografiskt granskad

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Brismar, Hjalmar

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