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Cell volume regulation in renal cortical cells.

H Völkl1, M Paulmichl, F Lang

  • 1Institute of Physiology, University of Innsbruck, Austria.

Renal Physiology and Biochemistry
|May 1, 1988
PubMed
Summary

Proximal renal tubule and MDCK cells regulate volume in hypotonic solutions. This process involves ion transport mechanisms, potentially including potassium channels and bicarbonate-sodium cotransport, and may be triggered by leucotrienes.

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Area of Science:

  • Cellular Physiology
  • Renal Cell Biology
  • Membrane Transport

Background:

  • Proximal renal tubule cells and Madin-Darby canine kidney (MDCK) cells exhibit volume regulation in hypotonic environments.
  • Understanding these mechanisms is crucial for comprehending renal function and cell homeostasis.

Purpose of the Study:

  • To investigate the specific ion transport pathways involved in regulatory cell volume decrease (RCVD) in proximal tubules and MDCK cells.
  • To explore potential triggers for RCVD, such as leucotrienes, during cell swelling.

Main Methods:

  • Experimental manipulation of hypotonic media exposure on proximal tubule and MDCK cells.
  • Assessment of RCVD in the presence of specific inhibitors (barium, amiloride, acetazolamide) and ion-depleted solutions.
  • Electrophysiological and biochemical analyses to identify ion channel and transporter activity.

Main Results:

  • RCVD in proximal straight tubules is sensitive to barium, amiloride, and acetazolamide, and requires bicarbonate and sodium, but not chloride.
  • MDCK cells show activation of an anion channel and decreased potassium conductance during hypotonic stress.
  • Leucotrienes may act as signaling molecules triggering RCVD in both cell types during swelling.

Conclusions:

  • RCVD in proximal tubules may involve parallel potassium efflux via channels and sodium-bicarbonate cotransport, or alternative mechanisms like K+/H+ exchange.
  • MDCK cell volume regulation appears to involve distinct anion and cation transport pathways.
  • Cell volume regulation is a fundamental cellular process with implications for renal transepithelial transport.

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