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Related Concept Videos

Carrier-Mediated Transport01:06

Carrier-Mediated Transport

Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
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Glucose Absorption Into the Small Intestine01:26

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Related Experiment Video

Updated: Jun 3, 2026

Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters
11:51

Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters

Published on: February 3, 2018

Intestinal phosphate transport.

Yves Sabbagh1, Hector Giral, Yupanqui Caldas

  • 1Endocrine and Renal Sciences, Genzyme Corporation, Framingham, MA, USA.

Advances in Chronic Kidney Disease
|March 17, 2011
PubMed
Summary
This summary is machine-generated.

Intestinal phosphate absorption involves passive and active transport. The sodium-dependent phosphate cotransporter Npt2b is key for phosphate homeostasis, and its regulation offers potential CKD therapies.

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Last Updated: Jun 3, 2026

Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters
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Absolute Quantitation of Inositol Pyrophosphates by Capillary Electrophoresis Electrospray Ionization Mass Spectrometry
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Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry
08:07

Identification of Inositol Phosphate or Phosphoinositide Interacting Proteins by Affinity Chromatography Coupled to Western Blot or Mass Spectrometry

Published on: July 26, 2019

Area of Science:

  • Physiology
  • Molecular Biology
  • Nephrology

Background:

  • Phosphate absorption occurs via passive paracellular diffusion and active transport through sodium-dependent cotransporters.
  • Regulation of paracellular phosphate transport is poorly understood, unlike active transport via Npt2b.
  • Npt2b is a critical regulator of intestinal phosphate absorption and phosphate homeostasis.

Purpose of the Study:

  • To explore the regulation of intestinal phosphate transport mechanisms.
  • To investigate the role of Npt2b in phosphate homeostasis.
  • To identify potential therapeutic targets for hyperphosphatemia in chronic kidney disease (CKD).

Main Methods:

  • Conditional knockout mouse models to study Npt2b function.
  • Analysis of differential regulation of phosphate transporters (Npt2b, Pit1, Pit2).
  • Review of existing evidence on hormonal and dietary regulation of phosphate transport.

Main Results:

  • Npt2b is responsible for the majority of sodium-dependent phosphate uptake.
  • Conditional knockout of Npt2b impacts phosphate homeostasis by coordinating intestinal and renal reabsorption.
  • Type-III transporters Pit1 and Pit2 play a minor role in total phosphate uptake.
  • Differential regulation of Pit1 and Npt2b highlights complex control of phosphate transport.

Conclusions:

  • Npt2b plays a central role in regulating intestinal phosphate absorption and phosphate balance.
  • Targeting intestinal phosphate transport pathways may offer new treatments for hyperphosphatemia in CKD patients.