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Related Experiment Videos

Cell death pathways in juvenile Batten disease.

D A Persaud-Sawin1, R-M N Boustany

  • 1Departments of Pediatrics and Neurobiology, Duke University Medical Center, MSRB, Research Drive, Box 2604, Durham, NC 27710, USA.

Apoptosis : an International Journal on Programmed Cell Death
|September 10, 2005
PubMed
Summary

Juvenile Neuronal Ceroid Lipofuscinosis (JNCL) involves apoptosis and autophagy, with caspase pathways initiating autophagy. CLN3 protein, not caspases, prevents ceramide elevation and Golgi fragmentation, blocking JNCL cell death.

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Gene expression profiling in vLINCL CLN6-deficient fibroblasts: Insights into pathobiology.

Biochimica et biophysica actaยท2006
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Area of Science:

  • Cell Biology
  • Neuroscience
  • Biochemistry

Background:

  • Juvenile Neuronal Ceroid Lipofuscinosis (JNCL) is characterized by neuronal apoptosis, Golgi fragmentation, and elevated ceramide.
  • The precise mechanism of cell death in JNCL remains to be fully elucidated.

Purpose of the Study:

  • To investigate whether apoptosis is the primary mechanism of cell death in JNCL.
  • To analyze the interplay between caspase-dependent/independent pathways, autophagy, ceramide levels, and Golgi fragmentation in JNCL.

Main Methods:

  • Utilized caspase inhibitors (zVAD, caspase-8, -6, -9, -3 inhibitors) and autophagy inhibitors (3-methyladenine).
  • Assessed the effects of these inhibitors on cell death, caspase activation, autophagy, ceramide levels, and Golgi fragmentation.
  • Investigated the role of CLN3 in these cellular processes.

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Main Results:

  • Caspase activation was partially inhibited by zVAD, but cell death persisted, indicating both caspase-dependent and -independent apoptosis.
  • Caspase-dependent pathways were found to initiate autophagy; inhibiting caspase-8/-6 synergistically increased cell death.
  • Golgi fragmentation resulted from apoptosis and was blocked by CLN3, not zVAD.
  • CLN3, but not zVAD, prevented ceramide elevation, suggesting ceramide accumulation is independent of caspases.

Conclusions:

  • Both caspase-dependent and -independent apoptosis, along with autophagy, are key features of JNCL cell death.
  • Caspase-dependent pathways initiate autophagy, and combined inhibition of autophagy and specific caspases (caspase-8/-6) is synergistic.
  • CLN3 plays a critical role by blocking all cell death, preventing Golgi fragmentation, and inhibiting ceramide elevation in JNCL.