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Cell volume regulation in the nephron.

C Montrose-Rafizadeh1, W B Guggino

  • 1Department of Physiology, Johns Hopkins University, Baltimore, Maryland 21205.

Annual Review of Physiology
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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Kidney cells regulate their volume (RVI/RVD) against osmotic stress using ion transport and organic osmolytes. This cell volume control is crucial for kidney function and transepithelial transport.

Area of Science:

  • Nephrology
  • Cell Physiology
  • Renal Physiology

Background:

  • Kidney cells possess the ability to regulate their volume in response to osmotic challenges.
  • Responses include regulatory volume increase (RVI) in hypertonic conditions and regulatory volume decrease (RVD) in hypotonic conditions.

Purpose of the Study:

  • To investigate the mechanisms of cell volume regulation in kidney cells across different nephron segments.
  • To understand the role of ion transport and organic osmolytes in maintaining cell volume homeostasis.

Main Methods:

  • Analysis of ion flux pathways, including Na(+)-H+ and Cl(-)-HCO3- exchangers, and Na(+)-K(+)-2Cl- cotransporters.
  • Investigation of K+ and anion efflux mechanisms during RVD, including the role of ion channels.
  • Examination of organic osmolyte transport in medullary and papillary cells.

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Main Results:

  • RVI involves NaCl influx through various transporters and exchangers.
  • RVD is primarily mediated by K+ efflux via conductance pathways, with potential involvement of stretch-activated and Ca2(+)-activated K+ channels.
  • Anion efflux during RVD is segment-specific and may involve Cl- or HCO3-.
  • Organic osmolytes contribute to volume regulation in specific kidney cell types.

Conclusions:

  • All kidney nephron segments exhibit cell volume regulation in response to osmotic stress.
  • Cell volume regulation is essential for kidney cell survival during transcellular solute transport.
  • Maintaining cell volume homeostasis is critical for proper kidney function and fluid flow regulation.