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Cell volume regulation in rat thymocytes

A Arrazola1, R Rota, P Hannaert

  • 1INSERM U2, Faculté de Médecine, Créteil, France.

The Journal of Physiology
|June 1, 1993
PubMed
Summary

Regulatory volume decrease (RVD) in rat thymocytes is primarily mediated by the potassium-chloride (K+-Cl-) co-transport system. This system

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Area of Science:

  • Cell physiology
  • Ion transport mechanisms
  • Cell volume regulation

Background:

  • Regulatory volume decrease (RVD) is a critical cellular process for maintaining cell volume homeostasis.
  • The specific ion transport mechanisms underlying RVD in thymocytes have not been fully elucidated.

Purpose of the Study:

  • To investigate the role of the K+-Cl- co-transport system in mediating RVD in rat thymocytes.
  • To characterize the properties and inhibitors of the RVD process.

Main Methods:

  • Utilized dihydroindenyl-oxy-alkanoic acid (DIOA), a K+-Cl- co-transport inhibitor, to assess its effect on RVD in rat thymocytes.
  • Tested the effects of various other ion transport inhibitors and ionic substitutions (Cl-, Na+, K+) on RVD.
  • Analyzed RVD kinetics, capacity, and rate in response to cell swelling and pharmacological interventions.

Main Results:

  • DIOA (2.2 x 10(-5) mol l-1) completely inhibited RVD in swelled rat thymocytes, while other inhibitors were ineffective.
  • DIOA-sensitive RVD exhibited mono-exponential kinetics with a half-lifetime of 1-3 min and maximal capacity of ~55% of initial swelling.
  • RVD was modulated by external Cl- and Na+/K+ concentrations and inhibited by K+ depletion, with all effects blocked by DIOA.

Conclusions:

  • The K+-Cl- co-transport system is the primary mediator of RVD in rat thymocytes.
  • DIOA is a potent and specific inhibitor of this RVD pathway.
  • Thymocytes treated with DIOA behave as osmometers, highlighting the critical role of K+-Cl- co-transport in volume regulation.

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