A Golgi fragmentation pathway in neurodegeneration

Neurobiol Dis. 2008 Feb;29(2):221-31. doi: 10.1016/j.nbd.2007.08.015. Epub 2007 Sep 7.

Abstract

The Golgi apparatus processes intracellular proteins, but undergoes disassembly and fragmentation during apoptosis in several neurodegenerative disorders such as amyotrophic lateral sclerosis and Alzheimer's disease. It is well known that other cytoplasmic organelles play important roles in cell death pathways. Thus, we hypothesized that Golgi fragmentation might participate in transduction of cell death signals. Here, we found that Golgi fragmentation and dispersal precede neuronal cell death triggered by excitotoxins, oxidative/nitrosative insults, or ER stress. Pharmacological intervention or overexpression of the C-terminal fragment of Grasp65, a Golgi-associated protein, inhibits fragmentation and decreases or delays neuronal cell death. Inhibition of mitochondrial or ER cell death pathways also decreases Golgi fragmentation, indicating crosstalk between organelles and suggesting that the Golgi may be a common downstream-effector of cell death. Taken together, these findings implicate the Golgi as a sensor of stress signals in cell death pathways.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Analysis of Variance
  • Animals
  • Apoptosis / drug effects
  • Apoptosis / physiology
  • Cells, Cultured
  • Cerebral Cortex / pathology
  • Cysteine / analogs & derivatives
  • Cysteine / pharmacology
  • Dose-Response Relationship, Drug
  • Embryo, Mammalian
  • Excitatory Amino Acid Agonists / pharmacology
  • Golgi Apparatus / drug effects
  • Golgi Apparatus / pathology*
  • Luminescent Proteins / biosynthesis
  • Mitochondria / drug effects
  • Mitochondria / metabolism
  • N-Methylaspartate / pharmacology
  • Nerve Degeneration / chemically induced
  • Nerve Degeneration / genetics
  • Nerve Degeneration / pathology*
  • Neurons / drug effects
  • Neurons / pathology*
  • Nitric Oxide Donors / pharmacology
  • Rats
  • S-Nitrosothiols / pharmacology
  • Signal Transduction / drug effects
  • Signal Transduction / physiology*
  • Time Factors
  • Transfection / methods
  • Tubulin / metabolism

Substances

  • Excitatory Amino Acid Agonists
  • Luminescent Proteins
  • Nitric Oxide Donors
  • S-Nitrosothiols
  • Tubulin
  • N-Methylaspartate
  • S-nitrosocysteine
  • Cysteine