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Related Experiment Videos

Morphological and functional changes in the enterocyte induced by fructose.

E M Danielsen1, G H Hansen, L L Wetterberg

  • 1Department of Biochemistry C, The Panum Institute, University of Copenhagen, Denmark.

The Biochemical Journal
|December 1, 1991
PubMed
Summary

Dietary fructose disrupts enterocyte function by impairing glycoprotein synthesis, leading to rapid degradation of microvillar enzymes and altered cell structure. This affects protein transport and brush-border membrane integrity.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Gastroenterology

Background:

  • Enterocytes synthesize microvillar enzymes essential for intestinal function.
  • Proper glycosylation is critical for enzyme stability and function.
  • Fructose is a common dietary sugar with potential cellular impacts.

Purpose of the Study:

  • To investigate the effects of fructose on enterocyte glycoprotein synthesis and membrane protein processing.
  • To elucidate the impact of impaired glycosylation on cellular morphology and function.
  • To determine the mechanism by which fructose affects exocytic membrane traffic.

Main Methods:

  • Organ-cultured pig intestinal-mucosal explants.
  • Pulse-chase experiments using [35S]methionine to track protein synthesis and degradation.

Related Experiment Videos

  • Morphological analysis of the Golgi complex and microvillar membrane.
  • Assessment of apolipoprotein A-1 secretion.
  • Measurement of actin incorporation into the microvillar cytoskeleton.

    • Main Results:

    • Fructose (10-50 mM) caused rapid degradation of newly synthesized microvillar enzymes, such as aminopeptidase N.
    • Abnormal glycoprotein biosynthesis affected Golgi complex morphology and function.
    • Secretion of non-glycosylated apolipoprotein A-1 was significantly inhibited, indicating disrupted secretory pathway transport.
    • Microvilli shortened by approximately 40%, and actin incorporation into the cytoskeleton decreased.

    Conclusions:

    • Fructose profoundly perturbs exocytic membrane traffic in enterocytes by affecting membrane glycoprotein synthesis.
    • Impaired glycosylation leads to enzyme degradation, altered cellular structure, and disrupted protein transport.
    • These findings highlight the detrimental effects of dietary fructose on intestinal cell function.