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Related Experiment Videos

Collagen degradation in I-cells is normal.

R S Bienkowski1, C R Ripley, R Gitzelmann

  • 1Pediatric Research Center, Schneider Children's Hospital of Long Island Jewish Medical Center, New Hyde Park, New York 11042.

Biochemical and Biophysical Research Communications
|April 30, 1990
PubMed
Summary

Intracellular collagen degradation occurs even without fully functional lysosomal enzymes. This study suggests a non-lysosomal pathway may exist for breaking down structurally abnormal collagen in I-cell disease.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Genetics

Background:

  • Lysosomal proteases are known to degrade abnormal intracellular collagen.
  • I-Cell disease (Mucolipidosis II) is characterized by deficient lysosomal hydrolases, including cathepsin B, a collagenolytic enzyme.

Purpose of the Study:

  • To test the hypothesis that intracellular degradation of abnormal collagen is impaired in I-cell disease.
  • To investigate the role of lysosomal enzymes in the degradation of structurally abnormal collagen.

Main Methods:

  • Skin fibroblasts from I-cell disease patients and normal fibroblasts were cultured.
  • Cells were incubated with cis-hydroxyproline and [14C]proline to induce and label abnormal collagen.
  • Intracellular collagen degradation was quantified by measuring [14C]hydroxyproline in low molecular weight fractions.

Related Experiment Videos

  • Lysosomal pathway functionality was assessed by epidermal growth factor degradation.

    • Main Results:

    • Intracellular degradation of abnormal collagen was significantly higher in I-cells treated with cis-hydroxyproline compared to untreated cells.
    • Similar degradation levels were observed in normal human fetal lung fibroblasts under the same conditions.
    • Lysosomal protein degradation, assessed via epidermal growth factor breakdown, was markedly reduced in I-cells compared to normal cells.

    Conclusions:

    • A complete set of lysosomal enzymes is not essential for the intracellular degradation of structurally abnormal collagen.
    • The findings suggest the existence of a non-lysosomal pathway responsible for degrading abnormal collagen.
    • This implies alternative mechanisms for collagen turnover in certain cellular conditions or diseases.