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Related Experiment Videos

Cation transport in mouse erythrocytes: role of K(+)-Cl- cotransport in regulatory volume decrease

C C Armsby1, C Brugnara, S L Alper

  • 1Department of Laboratory Medicine, Children's Hospital, Boston, Massachusetts, USA.

The American Journal of Physiology
|April 1, 1995
PubMed
Summary
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Mouse erythrocytes exhibit chloride-dependent potassium efflux and regulatory volume decrease (RVD) mediated by K(+)-Cl- cotransport, as evidenced by okadaic acid sensitivity.

Area of Science:

  • Physiology
  • Cell Biology
  • Ion Transport

Background:

  • Erythrocytes play a crucial role in maintaining cellular homeostasis and regulating blood volume.
  • Understanding cation transport mechanisms is vital for comprehending cell volume regulation.

Purpose of the Study:

  • To investigate cation transport and cell volume regulation in erythrocytes of CD1 and C57/B6 mice.
  • To elucidate the role of potassium-chloride cotransport in regulatory volume decrease (RVD).

Main Methods:

  • Erythrocytes from CD1 and C57/B6 mice were subjected to osmotic stress (hypotonic swelling) and chemical treatments.
  • Potassium (K+) efflux and cell volume changes were measured.
  • The effects of specific inhibitors (ouabain, bumetanide, clotrimazole, okadaic acid) and ion substitutions (Cl- replacement) were assessed.

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Main Results:

  • Swelling stimulated an ouabain-insensitive K+ efflux that was 75% chloride-dependent.
  • Okadaic acid (OA) significantly inhibited swelling-induced K+ efflux and regulatory volume decrease (RVD).
  • RVD and K+ loss were observed in hypotonic or nystatin-treated cells, sensitive to OA and chloride availability.

Conclusions:

  • Mouse erythrocytes possess an OA-sensitive regulatory volume decrease (RVD) mechanism.
  • These findings strongly suggest the presence of K(+)-Cl- cotransport mediating RVD in mouse erythrocytes.
  • The study highlights the importance of chloride-dependent pathways in erythrocyte volume regulation.