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J Physiol Volume 511, Number 1, 235-243, August 15, 1998
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The Journal of Physiology (1998), 511.1, pp. 235-243
© Copyright 1998 The Physiological Society

Protein kinase A induces recruitment of active Na+,K+-ATPase units to the plasma membrane of rat proximal convoluted tubule cells

Maria Luisa Carranza, Martine Rousselot, Alexander V. Chibalin *, Alejandro M. Bertorello *, Hervé Favre and Eric Féraille

Laboratoire de Néphrologie, Fondation pour Recherches Médicales, Avenue de la Roseraie 64, CH-1211 Genève 4, Switzerland and * Department of Molecular Medicine, Karolinska Institute, Rolf Luft Centre for Diabetes Research, Karolinska Hospital, 17176 Stockholm, Sweden

  1. The aim of this study was to investigate the mechanism of control of Na+,K+-ATPase activity by the cAMP-protein kinase A (PKA) pathway in rat proximal convoluted tubules. For this purpose, we studied the in vitro action of exogenous cAMP (10-3 M dibutyryl-cAMP (db-cAMP) or 8-bromo-cAMP) and endogenous cAMP (direct activation of adenylyl cyclases by 10-5 M forskolin) on Na+,K+-ATPase activity and membrane trafficking.

  2. PKA activation stimulated both the cation transport and hydrolytic activity of Na+,K+-ATPase by about 40 %. Transport activity stimulation was specific to the PKA signalling pathway since (1) db-cAMP stimulated the ouabain-sensitive 86Rb+ uptake in a time- and dose-dependent fashion; (2) this effect was abolished by addition of H-89 or Rp-cAMPS, two structurally different PKA inhibitors; and (3) this stimulation was not affected by inhibition of protein kinase C (PKC) by GF109203X. The stimulatory effect of db-cAMP on the hydrolytic activity of Na+,K+-ATPase was accounted for by an increased maximal ATPase rate (Vmax) without alteration of the efficiency of the pump, suggesting that cAMP-PKA pathway was implicated in membrane redistribution control.

  3. To test this hypothesis, we used two different approaches: (1) cell surface protein biotinylation and (2) subcellular fractionation. Both approaches confirmed that the cAMP-PKA pathway was implicated in membrane trafficking regulation. The stimulation of Na+,K+-ATPase activity by db-cAMP was associated with an increase (+40 %) in Na+,K+-ATPase units expressed at the cell surface which was assessed by Western blotting after streptavidin precipitation of biotinylated cell surface proteins. Subcellular fractionation confirmed the increased expression in pump units at the cell surface which was accompanied by a decrease (-30 %) in pump units located in the subcellular fraction corresponding to early endosomes.

  4. In conclusion, PKA stimulates Na+,K+-ATPase activity, at least in part, by increasing the number of Na+-K+ pumps in the plasma membrane in proximal convoluted tubule cells.



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