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Active tubular secretion is a robust, energy-demanding process that utilizes carrier systems to transport drugs into renal tubules. The active renal secretion systems include the organic anion transporter (OAT) for weak acids and the organic cation transporter (OCT) for weak bases. Structurally similar drugs can compete for the same transporter, potentially leading to drug accumulation and toxicity. However, this principle can be exploited therapeutically. One example is probenecid (Probalan),...
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Once the process of glomerular filtration is completed, blood carrying unfiltered drug molecules traverses through efferent arterioles and makes its way into the peritubular capillaries in the proximal tubule. A variety of carriers play a pivotal role in actively secreting drugs from these peritubular capillaries into the tubular fluid. The organic anion transporter transfers acidic drugs, against an electrochemical gradient, from the peritubular capillaries into the renal tubule cells and...
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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
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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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Active Transport01:14

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Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
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The pharmacogenetics of drug transporters is increasingly recognized as a critical factor influencing interindividual variability in drug absorption, distribution, and elimination. These membrane-bound proteins regulate drugs' movement across cellular barriers by actively pumping them out (efflux) or facilitating their uptake (influx). Among the major transporter families, ATP-binding cassette (ABC) and solute carrier (SLC) transporters play particularly prominent roles. Genetic polymorphisms...
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Related Experiment Video

Updated: Apr 26, 2026

Isolation of Primary Human Proximal Tubule Epithelial Cells and Their Use in Creating a Microphysiological Model of the Renal Proximal Tubule
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Renal phosphate transporters.

Eleanor Lederer1

  • 1aMedical Services, Robley Rex VA Medical Center bKidney Disease Program, University of Louisville School of Medicine, Louisville, Kentucky, USA.

Current Opinion in Nephrology and Hypertension
|July 17, 2014
PubMed
Summary

This review highlights recent advances in understanding phosphate transporters, crucial for maintaining phosphate balance. Discoveries in their structure, regulation, and roles offer hope for new treatments for phosphate disorders.

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Physiology

Background:

  • Phosphate homeostasis is regulated by bone, kidney, intestine, and parathyroid gland.
  • Renal phosphate transporters are key regulators of serum phosphate concentration and overall body phosphate balance.

Purpose of the Study:

  • This review focuses on the latest updates in phosphate transport and transporters.
  • Emphasis is placed on renal phosphate transporters.

Main Methods:

  • Structure function analysis of type II sodium phosphate cotransporters.
  • Identification of previously unknown regulators of phosphate transporters.

Main Results:

  • Identified key amino acid residues important for solute binding and transport in type II sodium phosphate cotransporters.
  • Discovered novel regulators of phosphate transporters, though their physiological significance requires further study.
  • Type II and III sodium phosphate cotransporters are critical in bone, choroid plexus, and vascular systems.

Conclusions:

  • Advances in understanding sodium phosphate cotransporter structure-function relationships are significant.
  • The complex regulation and roles of these transporters in renal and non-renal tissues are increasingly recognized.
  • This knowledge promises more targeted therapies for phosphate homeostasis disorders.