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Related Concept Videos

Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
The Doluisio method involves perfusing a prepared segment of a rat's small intestine with a solution of radiolabeled drug and a non-absorbable marker. This helps to differentiate between absorbed and non-absorbed drug concentrations. The intestinal segment is connected at both ends using tubing and syringes,...

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Related Experiment Video

Updated: Jun 4, 2026

Isolation of Primary Human Proximal Tubule Epithelial Cells and Their Use in Creating a Microphysiological Model of the Renal Proximal Tubule
07:06

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

Published on: May 9, 2025

In vitro proximal tubule perfusion preparation.

J L Garvin1, P J Harris

  • 1Division of Hypertension and Vascular Research, Henry Ford Health Sciences Center, Detroit, MI.

Methods in Molecular Medicine
|February 19, 2011
PubMed
Summary

The single nephron segment isolation technique allows detailed study of kidney tubule transport. This method enables precise control over experimental conditions, crucial for understanding cellular mechanisms.

Area of Science:

  • Nephrology
  • Renal Physiology
  • Cellular Biology

Background:

  • The isolation and perfusion of single nephron segments, pioneered by Burg et al. in 1966, is a foundational technique in renal physiology.
  • This method preserves the integrity of the nephron epithelium and its junctional complexes.
  • It allows for the removal of confounding endogenous neural or humoral factors, such as angiotensins.

Purpose of the Study:

  • To investigate transepithelial and transmembrane transport in individual nephron segments.
  • To study the effects of specific mediators, like angiotensin, on nephron function under controlled conditions.
  • To explore differential signaling pathways activated by angiotensin binding to luminal versus basolateral receptors.

Main Methods:

  • Isolation and in vitro perfusion of single nephron segments.

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Last Updated: Jun 4, 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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  • Careful control of bath and luminal perfusate composition and flow rates.
  • Independent addition of peptides (e.g., angiotensin) to either side of the epithelium.

    • Main Results:

    • The technique facilitates the study of transport processes in a physiologically relevant, yet controlled, environment.
    • It allows for the precise investigation of how exogenous substances influence nephron function.
    • Enables differentiation of signaling pathways initiated from different receptor locations.

    Conclusions:

    • Single nephron segment isolation and perfusion is an invaluable tool for dissecting complex renal transport mechanisms.
    • This methodology is particularly suited for studying the role of specific peptide hormones like angiotensin in renal physiology.
    • It provides a platform for understanding receptor-mediated signaling within distinct nephron segments.