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Updated: Jul 2, 2026

Using Caco-2 Cells to Study Lipid Transport by the Intestine
07:00

Using Caco-2 Cells to Study Lipid Transport by the Intestine

Published on: August 20, 2015

[Absorption mechanism of icariin across Caco-2 monolayer model]

Yan Chen1, Xiao-Bin Jia, Ming Hu

  • 1Jiangsu Provincial Academy of Traditional Chinese Medicine, Jiangsu Engineering and Technology Research Center for Modern Chinese Pharmaceutical Preparation, Nanjing 210028, China. ychen202@yahoo.com.cn

Zhongguo Zhong Yao Za Zhi = Zhongguo Zhongyao Zazhi = China Journal of Chinese Materia Medica
|August 30, 2008
PubMed

Insights

Icariin absorption in Caco-2 cells suggests P-glycoprotein (P-gp) transporter secretion limits bioavailability. Verapamil, a P-gp inhibitor, altered icariin transport, indicating P-gp

Area of Science:

  • Pharmacokinetics and drug absorption studies.
  • Cellular biology and membrane transport mechanisms.

Background:

  • Icariin is a key flavonoid from Epimedium species with potential therapeutic applications.
  • Understanding icariin's absorption is crucial for optimizing its clinical efficacy.

Purpose of the Study:

  • To elucidate the absorption mechanism of icariin using a Caco-2 cell monolayer model.
  • To investigate the role of efflux transporters in icariin's intestinal permeability.

Main Methods:

  • Utilized a Caco-2 cell monolayer model to assess bi-directional transport of icariin.
  • Evaluated the impact of incubation time, drug concentration, and P-glycoprotein (P-gp) inhibition on icariin absorption.
  • Quantified icariin concentrations using Ultra-Performance Liquid Chromatography (UPLC) and calculated apparent permeability coefficients (Papp).

Main Results:

  • Icariin transport demonstrated a linear increase with time up to 14 hours.
  • A significantly higher transport from basal to apical (PBA) compared to apical to basal (PAB) was observed (PBA/PAB ratio > 4).
  • Verapamil, a P-gp inhibitor, significantly affected icariin transport, increasing PAB and decreasing the PBA/PAB ratio.

Conclusions:

  • The study suggests that P-glycoprotein (P-gp) mediated efflux is a major factor limiting icariin absorption in the Caco-2 cell model.
  • These findings highlight the potential role of P-gp in reducing the oral bioavailability of icariin.
Abstract

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