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Evidence for multiple complementary pathways for efficient cholesterol absorption in mice.

Jahangir Iqbal1, M Mahmood Hussain

  • 1Department of Anatomy and Cell Biology, and Pediatrics, SUNY Downstate Medical Center, Brooklyn, NY, USA.

Journal of Lipid Research
|April 19, 2005
PubMed
Summary

High-density lipoproteins (HDLs) mediated by apolipoprotein A-I (apoA-I) are crucial for cholesterol transport. ApoA-I deficiency delays intestinal cholesterol absorption, but compensatory mechanisms ensure eventual absorption.

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Area of Science:

  • Lipid metabolism
  • Gastroenterology
  • Cardiovascular research

Background:

  • Cholesterol transport involves both apolipoprotein B (apoB)-dependent and independent pathways.
  • High-density lipoproteins (HDLs) containing apolipoprotein A-I (apoA-I) mediate an apoB-independent cholesterol transport pathway.

Purpose of the Study:

  • To investigate the role of apoA-I in cholesterol absorption and transport in vivo.
  • To elucidate the contribution of apoA-I-containing HDLs to cholesterol absorption.

Main Methods:

  • Primary enterocytes from apoA-I knockout (apoA-I(-/-)) and wild-type mice were isolated and analyzed for cholesterol secretion.
  • Cholesterol absorption and transport were assessed in apoA-I(-/-) and control mice under various dietary conditions.
  • In vivo studies utilized short-term and long-term cholesterol feeding protocols.

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Main Results:

  • Cholesterol secretion via the apoA-I HDL pathway was significantly reduced in apoA-I(-/-) enterocytes.
  • Extracellular apoA-I addition restored cholesterol efflux in apoA-I(-/-) enterocytes.
  • While initial cholesterol absorption was similar, apoA-I deficiency led to delayed cholesterol absorption over longer intestinal segments and reduced plasma/liver cholesterol transport.
  • Long-term studies revealed a significant reduction in cholesterol absorption in apoA-I(-/-) mice.

Conclusions:

  • ApoA-I plays a significant role in efficient intestinal cholesterol absorption.
  • The apoB pathway can compensate for apoA-I deficiency, ensuring eventual cholesterol absorption.
  • Multiple compensatory mechanisms exist to maintain cholesterol homeostasis in mice.