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Related Experiment Videos

[Urea transporters]

P Ripoche1, G Rousselet

  • 1Service de biologique cellulaire, CEA/Saclay, Gif-sur-Yvette.

Nephrologie
|January 1, 1996
PubMed
Summary
This summary is machine-generated.

Two mammalian urea transporters, UT2 and UT11, were identified with distinct tissue localizations and functions. UT2 is likely the vasopressin-sensitive carrier, while UT11 is the constitutive red blood cell transporter.

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Area of Science:

  • Membrane transport
  • Molecular biology
  • Physiology

Context:

  • Water and urea utilize distinct mechanisms to traverse biological membranes, involving channels and carriers.
  • While numerous water channels (aquaporins) have been identified, mammalian urea transport has been primarily linked to two characterized transporters, UT2 and UT11.
  • Sequence homology suggested these represented different carrier types, a hypothesis supported by their unique tissue distributions.

Purpose:

  • To characterize the distinct roles and properties of the two identified mammalian urea transporters, UT2 and UT11.
  • To investigate the regulation of UT2 gene expression based on dietary and hydration conditions.
  • To confirm the functional differences between UT2 and UT11 through heterologous expression and transport assays.

Summary:

Related Experiment Videos

  • UT2 localizes to the renal medulla, potentially acting as the arginine vasopressin-sensitive urea carrier, with its large transcript regulated by protein intake.
  • UT11 is found in various tissues including the testis, spleen, brain, and kidney, functioning as the constitutive urea transporter observed in red blood cells.
  • Heterologous expression in Xenopus oocytes demonstrated that UT2 facilitates greater urea uptake than UT11, with both inhibited by phloretin, and UT11 also by pCMBS, and exhibiting saturable thiourea transport.

Impact:

  • The findings differentiate the physiological roles of UT2 and UT11 in urea homeostasis and tissue-specific transport.
  • Understanding these transporters provides insights into kidney function, red blood cell physiology, and potential targets for therapeutic intervention.
  • Further research is needed to identify and characterize additional urea transporters in different tissues and renal segments.