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Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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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.
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Secondary Active Transport01:55

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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and...
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Transcellular transport of solutes is the movement of substances like monosaccharides and amino acids through polarized cells. This transport mechanism is primarily seen in epithelial and endothelial cells aided by membrane transport proteins such as channels and transporters. The tight junctions between these cells confine the membrane proteins to the two sides of the cell. The epithelial cells have distinct apical and basolateral domains. In contrast, the endothelial cells show the luminal...
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Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles
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A cell suspension based uptake method to study high affinity glucosinolate transporters.

Deepti M Nambiar1, Juhi Kumari1, Gulab C Arya1

  • 1National Institute of Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, 110067 India.

Plant Methods
|June 4, 2020
PubMed
Summary

A novel plant-based assay system using cotton cell lines effectively characterizes Arabidopsis glucosinolate transporters (GTRs). This system enables robust uptake studies and aids in understanding GTR function for Brassica crop improvement.

Keywords:
Cotton cell suspensionsGTR transportersGlucosinolatesKinetic analysisSecondary metabolite transporters

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Area of Science:

  • Plant Molecular Biology
  • Plant Physiology
  • Biochemistry

Background:

  • Glucosinolates are key secondary metabolites in Brassicales, crucial for plant defense and impacting human health (anticarcinogenic/antinutritive).
  • High-affinity glucosinolate transporters (GTRs) facilitate glucosinolate translocation in Brassicaceae, making them targets for Brassica crop improvement.
  • Existing heterologous systems (e.g., Xenopus oocytes) have limitations; a plant-based system is needed for accurate transporter characterization.

Purpose of the Study:

  • To develop and validate a novel plant-based heterologous assay system for functional characterization of Arabidopsis glucosinolate transporters (AtGTR1 and AtGTR2).
  • To optimize conditions for glucosinolate uptake assays using GTR-expressing cotton cell lines (CCL-1).
  • To perform kinetic analysis of AtGTR1 and AtGTR2 using the developed plant cell system.

Main Methods:

  • Agrobacterium-mediated transformation was used to create GTR-expressing cotton cell lines (CCL-1).
  • Sub-cellular localization of AtGTRs was determined, followed by standardization of glucosinolate uptake assays in CCL-1 cells.
  • Kinetic analysis of AtGTR1 and AtGTR2 was performed for various glucosinolate substrates under optimized conditions (pH, salt, time).

Main Results:

  • Stable GTR-expressing cotton cell lines (CCL-1) were established, showing predominant plasma membrane localization of AtGTR1 and AtGTR2.
  • Standardized uptake assays demonstrated robust, time-dependent glucosinolate accumulation within physiological pH (5-6) and low nitrate salt concentrations.
  • Kinetic studies confirmed saturable, high-affinity uptake of aliphatic and aromatic glucosinolates by AtGTR1 and AtGTR2, validating the assay system.

Conclusions:

  • The developed plant cell suspension system provides an efficient, plant-based platform for functional characterization of GTR homologs across the Brassicaceae family.
  • This novel system facilitates rapid in vitro assays, enabling study of transporter sub-functionalization and potentially other metabolite transporters.
  • The system's ability to support efficient GTR function without sequence modification offers advantages over animal-based systems.