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Acute ethanol effects on cell volume regulation.
1Laboratory Service, VA Medical Center, Salt Lake City, UT 84148.
Annals of Clinical and Laboratory Science
|May 1, 1990
Summary
Ethanol affects goldfish kidney tubule cell volume regulation. Low ethanol concentrations enhance cell swelling and shrinkage, while higher doses inhibit these osmoregulatory processes.
Area of Science:
- Cellular physiology
- Renal physiology
- Environmental toxicology
Background:
- Cellular osmoregulation is crucial for maintaining cell volume homeostasis.
- Renal proximal tubules play a key role in regulating body fluid composition.
- Ethanol exposure can disrupt normal physiological processes.
Purpose of the Study:
- To investigate the dose-dependent effects of ethanol on cellular osmoregulation in isolated goldfish renal tubules.
- To elucidate the mechanisms underlying ethanol's impact on cell volume regulatory responses.
Main Methods:
- Isolated proximal renal tubules from Carassius auratus (goldfish) were utilized.
- Cells were exposed to hypotonic solutions with varying ethanol concentrations (0-28 mM).
- Osmometric swelling and volume regulatory decrease (VRD) phases were monitored.
Main Results:
- Low ethanol concentrations (7-12 mM) increased membrane water permeability and KCl efflux, enhancing VRD.
- Higher ethanol concentrations (14-28 mM) inhibited the osmometric phase and abolished VRD.
- Ethanol's effects were dose-dependent, with inhibition occurring between 12 and 14 mM.
Conclusions:
- Ethanol exhibits biphasic effects on renal tubule osmoregulation: stimulatory at low doses and inhibitory at higher doses.
- Stimulation is linked to increased membrane fluidity and calcium release, while inhibition involves impaired water and KCl transport.
- These findings highlight ethanol's potential to disrupt kidney function and fluid balance.