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Related Experiment Videos

Abnormal cathepsin B activity in Batten disease.

G Dawson1, P T Glaser

  • 1Joseph P. Kennedy, Jr. Mental Retardation Research Center, Department of Pediatrics, University of Chicago, Illinois 60637.

American Journal of Medical Genetics. Supplement
|January 1, 1988
PubMed
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Neuronal ceroid-lipofuscinosis (NCL) fibroblasts show reduced cathepsin B activity, but this is not the primary defect. Impaired lipid metabolism and phospholipase A2 deficiency may underlie NCL.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Neuroscience

Background:

  • Neuronal ceroid-lipofuscinosis (NCL), also known as Batten disease, is a group of inherited neurodegenerative disorders.
  • Previous studies suggested a potential protease defect, specifically involving cathepsin B, in NCL pathogenesis.
  • Lysosomal dysfunction is a hallmark of NCL, impacting cellular waste disposal and neuronal health.

Purpose of the Study:

  • To investigate the role of cathepsin B activity in NCL fibroblasts.
  • To explore potential mechanisms for altered protease activity in NCL.
  • To identify the primary molecular defect underlying NCL.

Main Methods:

  • Culturing fibroblasts from NCL patients and assessing cathepsin B and H activity over time.
  • Utilizing colorimetric, fluorimetric, and autoradiographic methods for enzyme assays.

Related Experiment Videos

  • Analyzing lysosomal localization and buoyancy using Percoll gradient fractionation.
  • Testing the sensitivity of cathepsin B to peroxides and aldehydes (hydrogen peroxide, 4-hydroxynonenal).
  • Investigating bradykinin-induced release of [3H]arachidonate in NCL fibroblasts.

    • Main Results:

    • Fibroblasts from NCL patients exhibited decreased cathepsin B activity with increasing passage number, while cathepsin H and other lysosomal hydrolases remained unaffected.
    • Abnormally buoyant lysosomes with reduced cathepsin B were observed in some NCL fibroblasts.
    • Cathepsin B was found to be sensitive to inactivation by hydrogen peroxide and 4-hydroxynonenal, which accumulate in NCL tissues.
    • NCL fibroblasts showed deficient release of [3H]arachidonate in response to bradykinin.

    Conclusions:

    • The data do not support a primary defect in cathepsin B as the cause of NCL.
    • Cathepsin B inactivation by accumulating peroxides and aldehydes may explain previous findings linking protease defects to NCL.
    • A deficiency in the removal of peroxidized lipids from phospholipids, potentially involving phospholipase A2, is proposed as the primary defect in NCL.