Molecular and Cellular Biochemistry

, Volume 147, Issue 1–2, pp 187–192 | Cite as

Inhibition of (Na/K)-ATPase by electrophilic substances: Functional implications

  • Albert Breier
  • Attila Ziegelhöffer
  • Tania Stankovičová
  • Peter Dočolomanský
  • Peter Gemeiner
  • Alena Vrbanová
Part III: Signal Transduction

Abstract

The effect of electrophilic substances: p-bromophenylisothiocyanate (PBITC); fluoresceinisothiocyanate (FITC); [4-isothiocyanatophenyl-(6-thioureidohexyl)-carbamoylmethyl]-ATP (ATPITC); 2,4,6-trinitrobezenesulfonic acid (TNBS); 1-(5-nitro-2-furyl)-2-phenylsulfonyl-2-furylcarbonyl ethylene (FE1); 1-(5-phenylsulfonyl-2-furyl)-2-phenylsulfonyl-2-furylcarbonyl ethylene (FE2) and 1-(5-phenylsulfonyl-2-furyl)-2-phenylsulfonyl-2-tienocarbonyl ethylene (FE3) on the sarcolemmal (Na/K)-ATPase isolated from guinea-pig hearts was studied. FITC and PBITC were found to inhibit competitively the activation of (Na/K)-ATPase by ATP. Being for the enzyme inhibitor and substrate at the same time ATPITC does not offered clear kinetic behavior. However, the activation of (Na/K)-ATPase by sodium and potassium ions was inhibited non-competitively by all three isothiocyanates. These data indicated that isothiocyanates may interact predominantly in the ATP-binding site of the enzyme molecule. In contrary to isothiocyanates TNBS and FE1 (FE2 and FE3 were ineffective) inhibited the activation of (Na/K)-ATPase by ATP non-competitively i.e., their interaction in the ATP-binding site seemed to be improbable. Nevertheless, TNBS and FE1 both manifested affinities to that moiety of (Na/K)-ATPase molecule which is binding potassium. More specific was the effect of FE1 that showed clearly competitive inhibition of potassium-stimulation of the enzyme activity. FE1 exerted also an ouabain-like effect on the mechanical activity of isolated perfused guinea-pig heart. This result indicates that FE1 seems to exert a selective inhibition of the (Na/K)-ATPase not only in vitro but also in integrated cardiac tissue.

Key words

(Na/K)-ATPase electrophilic reagents cation binding site isolated perfused heart 5-nitrofurylethylene 

Abbreviations and symbols

PBITC

p-bromophenylisothiocyanate

FITC

fluoresceinisothiocyanate

ATPITC

[4-isothiocyanatophenyl-(6-thioureidohexyl)-carbamoylmethyl]-ATP

TNBS

2,4,6-trinitrobenzenesulfonic acid

FE1

1-(5-nitro-2-furyl)-2-phenylsulfonyl-2-furylcarbonyl ethylene

FE2

1-(5-phenylsulfonyl-2-furyl)-2-phenylsulfonyl-2-furylcarbonyl ethylene

FE3

1-(5-phenylsulfonyl-2-furyl)-2-phenylsulfonyl-2-tienocarbonyl ethylene

DMSO

dimethylsufoxide

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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Albert Breier
    • 1
  • Attila Ziegelhöffer
    • 2
  • Tania Stankovičová
    • 2
  • Peter Dočolomanský
    • 1
  • Peter Gemeiner
    • 3
  • Alena Vrbanová
    • 1
  1. 1.Institute of Molecular Physiology and GeneticsSlovak Academy of SciencesBratislavaSlovak Republic
  2. 2.Institute for Heart ResearchSlovak Academy of SciencesBratislavaSlovak Republic
  3. 3.Institute of ChemistrySlovak Academy of SciencesBratislavaSlovak Republic

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