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Related Experiment Videos

The renal electrogenic Na+:HCO-3 cotransporter

V F Boron1, M A Hediger, E L Boulpaep

  • 1Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, CT 06520, USA. Boronwf@maspo3.mas.yale.edu

The Journal of Experimental Biology
|January 1, 1997
PubMed
Summary

Researchers identified a novel electrogenic sodium-bicarbonate cotransporter (NBC) in salamander kidneys. This transporter is crucial for bicarbonate and sodium reabsorption in the renal proximal tubule.

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Molecular aspects of medicine·2013

Area of Science:

  • Nephrology
  • Molecular Biology
  • Physiology

Background:

  • The electrogenic sodium-bicarbonate cotransporter (NBC) is vital for bicarbonate and sodium reabsorption in the renal proximal tubule.
  • Understanding the molecular mechanisms of this transporter is key to comprehending kidney function.

Purpose of the Study:

  • To expression-clone and characterize the salamander renal electrogenic Na+:Bicarbonate Cotransporter (NBC).
  • To identify and clone homologous NBCs in other species.

Main Methods:

  • Expression cloning in Xenopus laevis oocytes using microelectrode recordings of membrane potential and intracellular pH.
  • RNA fractionation, cDNA library construction, and screening.
  • Functional expression and characterization of cloned NBCs.

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Main Results:

  • Successfully cloned and functionally expressed the salamander NBC (aNBC) in oocytes.
  • Demonstrated that aNBC mediates electrogenic Na+:HCO3- cotransport, sensitive to DIDS and Na+ removal.
  • Identified and cloned a homologous rat NBC (rNBC) with significant sequence identity to aNBC.

Conclusions:

  • aNBC represents the first identified member of a new family of Na(+)-linked HCO3- transporters.
  • The cloned NBCs provide valuable tools for studying renal bicarbonate and sodium transport.
  • This discovery opens avenues for understanding and potentially treating kidney-related disorders.