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Related Experiment Videos

GSH depletion, K-Cl cotransport, and regulatory volume decrease in high-K/high-GSH dog red blood cells.

H Fujise1, K Higa, T Kanemaru

  • 1Laboratory of Pathobiochemistry, School of Veterinary Medicine, Azabu University, Fuchinobe, Sagamihara, Kanagawa 229, Japan.

American Journal of Physiology. Cell Physiology
|November 8, 2001
PubMed
Summary

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Glutathione (GSH) depletion activates red blood cell K-Cl cotransport (K-Cl COT) and cell volume regulation. The redox system, not just GSH levels, protects K-Cl COT activity from thiol modification.

Area of Science:

  • Redox biology
  • Cell physiology
  • Ion transport

Background:

  • K-Cl cotransport (K-Cl COT) is a crucial ion flux in red blood cells (RBCs), regulated by cellular thiol status.
  • Glutathione (GSH) plays a key role in maintaining cellular redox balance and protecting proteins from oxidative damage.
  • Previous studies suggest an inverse relationship between GSH levels and K-Cl COT activity in various species.

Purpose of the Study:

  • To investigate the relationship between GSH levels and K-Cl COT activity in high potassium, high GSH (HK/HG) dog RBCs.
  • To determine the impact of different GSH depletion methods on K-Cl COT and regulatory volume decrease (RVD).
  • To elucidate the protective role of the cellular redox system in maintaining K-Cl COT function.

Main Methods:

  • GSH depletion in dog RBCs using nitrite (NO(2))-mediated oxidation, diamide-induced dithiol formation, and glutathione S-transferase (GST)-catalyzed conjugation with CDNB.

Related Experiment Videos

  • Measurement of K-Cl COT activity and regulatory volume decrease (RVD) following GSH depletion.
  • Assessment of the reversibility of K-Cl COT activation upon GSH repletion.

    • Main Results:

    • All three GSH depletion methods significantly stimulated K-Cl COT activity, with diamide being the most potent, followed by NO(2) and CDNB.
    • GSH repletion partially reversed the K-Cl COT stimulation, indicating a dynamic interaction between GSH and transporter activity.
    • Cl-dependent RVD was observed concurrently with K-Cl COT activation, suggesting coordinated cell volume regulation.
    • Irreversible K-Cl COT activation occurred at high oxidant/GSH ratios, pointing to specific thiol modifications like nitrosothiolation or dinitrophenylation.

    Conclusions:

    • The cellular redox system, rather than absolute GSH levels, is critical for protecting K-Cl COT activity and cell volume regulation.
    • Specific thiol modifications, influenced by the redox state, likely mediate the activation of K-Cl COT.
    • Dog RBCs provide a valuable model for studying the intricate regulation of K-Cl COT by cellular redox status.