Gangliosides induce autophagic cell death in astrocytes: RESEARCH PAPER

Jaegyu Hwang, Shinrye Lee, Jung Tae Lee, Taeg Kyu Kwon, Deok Ryong Kim, Ho Kim, Hae Chul Park, Kyoungho Suk

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Background and purpose: Gangliosides, sialic acid-containing glycosphingolipids, abundant in brain, are involved in neuronal function and disease, but the precise molecular mechanisms underlying their physiological or pathological activities are poorly understood. In this study, the pathological role of gangliosides in the extracellular milieu with respect to glial cell death and lipid raft/membrane disruption was investigated. Experimental approach: We determined the effect of gangliosides on astrocyte death or survival using primary astrocyte cultures and astrocytoma/glioma cell lines as a model. Signalling pathways of ganglioside-induced autophagic cell death of astrocytes were examined using pharmacological inhibitors and biochemical and genetic assays. Key results: Gangliosides induced autophagic cell death in based on the following observations. Incubation of the cells with a mixture of gangliosides increased a punctate distribution of fluorescently labelled microtubule-associated protein 1 light chain 3 (GFP-LC3), the ratio of LC3-II/LC3-I and LC3 flux. Gangliosides also increased the formation of autophagic vacuoles as revealed by monodansylcadaverine staining. Ganglioside-induced cell death was inhibited by either a knockdown of beclin-1/Atg-6 or Atg-7 gene expression or by 3-methyladenine, an inhibitor of autophagy. Reactive oxygen species (ROS) were involved in ganglioside-induced autophagic cell death of astrocytes, because gangliosides induced ROS production and ROS scavengers decreased autophagic cell death. In addition, lipid rafts played an important role in ganglioside-induced astrocyte death. Conclusions and implications: Gangliosides released under pathological conditions may induce autophagic cell death of astrocytes, identifying a neuropathological role for gangliosides.

Original languageEnglish
Pages (from-to)586-603
Number of pages18
JournalBritish Journal of Pharmacology
Volume159
Issue number3
DOIs
Publication statusPublished - 2010 Feb 1

    Fingerprint

Keywords

  • Astrocytes
  • Autophagy
  • Ganglioside
  • MTOR
  • Reactive oxygen species

ASJC Scopus subject areas

  • Pharmacology

Cite this