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Related Experiment Videos

Na+ influx-induced decrease of (Na+ + K+)-ATPase activity in rat brain slices: role of Ca2+.

T Matsuda1, I Shimizu, A Baba

  • 1Department of Pharmacology, Faculty of Pharmaceutical Sciences, Osaka University, Japan.

European Journal of Pharmacology
|November 12, 1991
PubMed
Summary
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Veratrine and monensin reduce (Na+ + K+)-ATPase activity in rat brain slices by affecting maximal binding sites. Calcium and mitochondrial Na(+)-Ca2+ exchange influence this inhibition, which can be restored by BAPTA-AM.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Cellular Biology

Background:

  • The (Na+ + K+)-ATPase enzyme is crucial for maintaining cellular ion balance in neurons.
  • Veratrine and monensin are known ionophores that can affect cellular ion concentrations.

Purpose of the Study:

  • To investigate the effects of veratrine and monensin on (Na+ + K+)-ATPase activity in rat brain slices.
  • To elucidate the mechanisms underlying the observed inhibition of enzyme activity.

Main Methods:

  • Treatment of rat brain slices with varying concentrations of veratrine and monensin.
  • Measurement of (Na+ + K+)-ATPase activity and ouabain binding.
  • Assessment of the role of extracellular calcium, intracellular calcium chelators (BAPTA-AM), and specific inhibitors.

Related Experiment Videos

Main Results:

  • Both veratrine and monensin dose-dependently decreased (Na+ + K+)-ATPase activity and maximal ouabain binding sites.
  • Monensin's inhibitory effect was dependent on external calcium at low concentrations but not high.
  • Inhibition was reversible with BAPTA-AM and antagonized by specific channel blockers and mitochondrial Na(+)-Ca2+ exchange inhibitors.

Conclusions:

  • Veratrine and monensin impair (Na+ + K+)-ATPase function in rat brain slices.
  • The mechanism involves alterations in enzyme binding sites and is modulated by calcium and mitochondrial ion exchange.
  • Specific ion channels and mitochondrial function play a role in the neurotoxic effects of these ionophores.