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Updated: Jul 8, 2026

Using Caco-2 Cells to Study Lipid Transport by the Intestine
Published on: August 20, 2015
Taurocholate transport by human ileal brush border membrane vesicles
1Vanderbilt University Medical Center, Department of Pediatrics, Nashville, Tennessee 37232.
Human ileal brush border transport of taurocholate is a Na+-dependent, carrier-mediated, and electroneutral process. This mechanism couples one sodium ion with one taurocholate anion for transport.
Area of Science:
- Gastroenterology
- Cellular Physiology
- Biochemistry
Background:
- The human ileum plays a crucial role in bile acid reabsorption.
- Understanding the transport mechanisms of bile salts is vital for digestive health.
Purpose of the Study:
- To investigate the kinetics and energetics of taurocholate transport across the human ileal brush border.
- To elucidate the role of sodium ions and electrical potential in this transport process.
Main Methods:
- Preparation of human ileal brush border membrane vesicles from cadaveric renal allograft donors.
- Measurement of taurocholate uptake under varying sodium gradients and concentrations.
- Analysis of kinetic parameters including Michaelis constant and maximum velocity.
Main Results:
- Taurocholate uptake is significantly stimulated by an inwardly directed Na+ gradient compared to a K+ gradient.
- A 1:1 coupling ratio between Na+ and taurocholate was indicated by kinetic analysis.
- Transport was found to be electroneutral, independent of membrane potential changes.
Conclusions:
- Human ileal brush border uptake of taurocholate is mediated by a Na+-dependent carrier system.
- The transport mechanism is electroneutral, coupling one Na+ ion with one taurocholate anion.
- This confirms and extends previous findings from animal studies on ileal bile salt transport.
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