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Prechylomicron transport vesicle: isolation and partial characterization

N S Kumar1, C M Mansbach

  • 1Department of Medicine, Division of Gastroenterology University of Tennessee, Memphis 38163; and Veterans Affairs Medical Center, Memphis, Tennessee 38104, USA.

The American Journal of Physiology
|February 10, 1999
PubMed
Summary

Researchers isolated a novel vesicle crucial for transporting triacylglycerol (TG) from the endoplasmic reticulum (ER) to the Golgi apparatus in intestinal cells. This pre-Golgi vesicle is key to regulating chylomicron formation and TG transport.

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Area of Science:

  • Cell Biology
  • Gastroenterology
  • Lipid Metabolism

Background:

  • Intestinal chylomicron output is regulated, with vesicle transport from the ER to Golgi proposed as a rate-limiting step.
  • Understanding this transport vesicle is crucial for elucidating triacylglycerol (TG) transit within enterocytes.

Purpose of the Study:

  • To isolate and characterize the proposed vesicle responsible for transporting TG from the ER to the Golgi.
  • To confirm its role as the rate-limiting step in chylomicron biogenesis.

Main Methods:

  • Apical portions of rat intestinal cells were used to isolate vesicles via differential centrifugation in sucrose gradients.
  • Electron microscopy and immunoassays identified vesicle contents (apoB48, apoA-IV).
  • Enzyme assays and radiolabeled TG delivery experiments assessed vesicle function and origin/destination.

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Main Results:

  • A 200-nm vesicle was isolated, containing apoB48 and apoA-IV, but lacking apoA-I found in ER/Golgi.
  • [3H]TG-loaded vesicles successfully delivered TG to the Golgi, not the ER.
  • Marker enzyme assays confirmed the isolated fraction was distinct from ER and Golgi.

Conclusions:

  • A post-ER, pre-Golgi vesicle involved in TG transport has been successfully isolated and characterized.
  • This vesicle plays a critical role in the vectorial transport of TG to the Golgi apparatus.
  • The findings support the hypothesis that this vesicle represents the rate-limiting step in intestinal TG transport.