Methods of investigating intestinal transport

Area of Science:

• Gastroenterology
• Physiology
• Biochemistry

Background:

• Understanding gastrointestinal (GI) epithelial transport is crucial for nutrient absorption and drug delivery.
• Established methods have significantly advanced our knowledge of these complex processes.

Purpose of the Study:

• To provide a concise overview of the most impactful in vivo and in vitro techniques used to study GI epithelial transport.
• To highlight the evolution and application of these methodologies.

Main Methods:

• In vivo methods discussed include human double/triple-lumen perfusion and animal single/recirculation perfusion, and double-isotope techniques.
• In vitro techniques encompass everted gut sac, Ussing chamber, isolated epithelial cells, and isolated brush border/basolateral membranes.
• Emerging techniques like fluorescent probes for intracellular ion concentration measurement are also noted.

Main Results:

• Various perfusion techniques allow for in vivo assessment of net absorption and transport dynamics.
• In vitro models provide controlled environments to dissect specific transport mechanisms at the cellular and subcellular levels.
• Fluorescent probes offer a novel, powerful approach for real-time in vivo monitoring of ionic transport.

Conclusions:

• A diverse array of in vivo and in vitro methods are essential for comprehensively studying GI epithelial transport.
• These techniques collectively contribute to a deeper understanding of physiological and pathophysiological processes within the GI tract.
• Advancements in imaging and molecular probes continue to refine our ability to investigate intestinal transport.