Abstract
Phorbol 12-myristate 13-acetate (PMA), a stimulator of PKC, was examined for its influence on K+ (86Rb) influx in the frog erythrocyte. PMA, 0.1 μM, was found to accelerate ouabain-sensitive K+ influx, which was suppressed by 73% with 1 mM amiloride, indicating secondary activation of the Na+–K+-pump due to stimulation of Na+ /H+ exchange. PMA-induced stimulation of the sodium pump was completely inhibited with 1 μM staurosporine and by ~50% with 20 μM chelerythrine. In contrast to Na+–K+-pump, an activity of Cl−-dependent K+ transport (K–Cl cotransport, KCC), calculated as the difference between K+ influxes in Cl− and NO3 −-media, was substantially decreased under the influence of PMA. Staurosporine fully restored the PMA-induced inhibition of KCC, whereas chelerythrine did not exert any influence. Osmotic swelling of the frog erythrocytes was accompanied by approximately twofold stimulation of KCC. Swelling-activated KCC was inhibited by ~50 and ~83% in the presence of PMA and genistein, respectively, but not chelerythrine. Exposure of the frog erythrocytes to 5 mM fluoride (F−) also reduced the KCC activity in isotonic and hypotonic media, with maximal suppression of K+ influx in both media being observed upon simultaneous addition of PMA and F−. Furosemide and [(dihydronindenyl)oxy] alkanoic acid inhibited the K+ influx in both the media by ~50–60%. The results obtained show both the direct and indirect effects of PMA on the K+ transport in frog erythrocytes and a complicated picture of KCC regulation in frog erythrocytes with involvement of PKC, tyrosine kinase and protein phosphatase.
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Abbreviations
- RBC:
-
Red blood cells
- DMSO:
-
Dimethyl sulphoxide
- TRIS:
-
Tris(hydroxymethyl)aminomethane
- PMA:
-
Phorbol 12-myristate 13-acetate
- PKC:
-
Protein kinase C
- TK:
-
Tyrosine kinase
- PP:
-
Protein phosphatase
- NMDG:
-
N-methyl-d-glucamine
- DIOA:
-
[(Dihydronindenyl)oxy] alkanoic acid
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Communicated by G. Heldmaier.
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Agalakova, N.I., Gusev, G.P. Effects of phorbol 12-myristate 13-acetate on potassium transport in the red blood cells of frog Rana temporaria . J Comp Physiol B 179, 443–450 (2009). https://doi.org/10.1007/s00360-008-0324-2
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DOI: https://doi.org/10.1007/s00360-008-0324-2