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Related Experiment Videos

Sodium-proton exchange in crayfish.

Leonard B Kirschner1

  • 1School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USA. kirscl@wsu.edu

Biochimica Et Biophysica Acta
|November 8, 2002
PubMed
Summary

Amiloride and EIPA drugs did not differentiate between Na-H exchange mechanisms in crayfish. The study found these drugs equally effective in both salt-depleted and tapwater-adapted crayfish, challenging proposed models.

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The mechanism of sodium chloride uptake in hyperregulating aquatic animals.

The Journal of experimental biology·2004
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Area of Science:

  • Physiology
  • Zoology
  • Biochemistry

Background:

  • Proton pump inhibitors affected Na-H exchange differently in salt-depleted (SD) versus tapwater-adapted (TW) crayfish.
  • Previous findings suggested Na-H exchange mechanisms might involve a Na channel-H pump in SD crayfish and a 2Na-1H exchanger in TW crayfish.

Purpose of the Study:

  • To investigate the Na-H exchange mechanisms in crayfish using amiloride (AM) and ethylisopropyl AM (EIPA).
  • To determine if AM and EIPA could differentiate between a Na channel-H pump and a 2Na-1H exchanger model.

Main Methods:

  • Observed the effects of AM and EIPA on sodium (Na) fluxes in TW and SD crayfish.
  • Utilized the differential inhibitory properties of AM (blocks Na channel) and EIPA (blocks Na-H exchangers) to test proposed models.

Main Results:

  • EIPA potently inhibited Na influx in TW crayfish, but AM showed equipotent inhibition.
  • In SD crayfish, EIPA and AM demonstrated equal potency in inhibiting Na influx, similar to TW animals.
  • The expected differential action of AM and EIPA was not observed in either crayfish group.

Conclusions:

  • Amiloride and its analogues are not suitable for distinguishing between the proposed Na-H exchange models in crayfish.
  • The experimental data do not support the hypothesis of distinct Na-H exchange mechanisms based on the differential effects of AM and EIPA.

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